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  • saurabhjain

    Calling Mechanical Engineers to collaborate on Twitter

    By saurabhjain

    If you are a mechanical engineering professional and have a twitter account .. we invite you in our mechanical engineering  campaign to collaborate on twitter.. Retweet the following status on https://twitter.com/mechportal/status/646544243649961985 Look forward for your presence. Regards Mechanical Engineeirng forum
    • 5 comments
    • 1,478 views
  • DrD

    #20 -- A Question of Stability (Revised)

    By DrD

    Mechanics Corner
        A Journal of Applied Mechanics and Mathematics by DrD, #20
        © Machinery Dynamics Research, 2015
    A Question of Stability Introduction     The word stability in its several forms is widely used in nontechnical communication. A person whose life it highly consistent from day to day is said to have a stable life. When the political situation in a particular area appears to be unlikely to change, it is said to be stable. A person who is well balanced and unlikely to be easily provoked to anger is said to be a stable person. When the medical condition of a sick or injured person ceases to get worse, the person is said to be stabilized. A company on the verge of bankruptcy is said to be an unstable company. But what does the word stability mean in a technical context? Each of the foregoing examples hints at the technical meaning without really being explicit about it.   A factor g = accel of gravity was missing in the potential energy expression. That is now corrected.
        
     
        Stability.pdf
    • 16 comments
    • 5,709 views
  • DrD

    A Question for Readers

    By DrD

    Many of you have asked me various questions, so now it is my turn. Let me lay a bit of background first, and then the questions.   I have had some conversations recently with JAG (one of the other writers here at ME Forums) regarding the choice of software for 3D modeling and analysis. JAG has made some excellent suggestions, specifically a cloud based program called Onshape. Unfortunately, for reasons that are unclear, my computer cannot run Onshape; I have worked with their help people for several hours, all to no avail. JAG recommends this in part because there is a "free version for the hobbyist" and a relatively inexpensive "full version for the professional." That is pretty attractive, but since I can't run it, I'm stuck.   I gather that virtually all engineering colleges these days are teaching some sort of 3D modeling and analysis software, but that raises a few questions in my mind. 1. If your college teaches brandX 3D software, what will you do when you go to work for a small company that cannot afford anything more than 2D drafting (simple CAD), with no analysis capability at all? How will you do your job then? You probably have your own pocket calculator, but will you have your own copy of ANSYS or Pro-E? 2. What software does your school teach (every students should have an answer to this question, so I expect lots of replies on this one!)? 3. If you have used software extensively for analysis of engineering problems (beam deflections, stress analysis, fluid flow, heat transfer, etc), are you confident  that you will be able to work all of those problems if there is no such software available to you on the job?   I might add, as sort of a postscript, most of you know that I am older than dirt (I just had another birthday, so the situation is even worse!), so I tend to look at things from an elderly perspective. One of my great fears as a working engineer was "What will happen when I'm ask to do something that I don't know how to do?" It happened more than once, and it usually resulted in a flurry of intense research to come up to speed on whatever topic was involved. I could usually do that because I have a pretty good library, and I knew how to use a university library as well. But in terms of software, I was always concerned that I had no FEA program, so how could I do problems that others were doing by FEA? I have come up with some interesting work-arounds, including writing my own FEA for some problems, but I never wanted to be dependent on software that I could not afford to own. So, back to my questions about: How are you going to buy your own copy of ANSYS? DrD
    • 28 comments
    • 2,878 views
 

DRIVERLESS CARS

For generations, the automobile industry has been a source of innovation and economic growth. The ability to drive is a symbol of mobility and independence that spans generations. Clearly, automobiles play a significant role in our lives and afford many benefits to society.   Yet for all benefits conferred on society, no other invention in the history of civilian technology has caused as much harm as the automobile. Every 30 seconds. someone dies in a traffic accident, adding up to well over 1 million deaths each year. In the US automobile accidents are the leading cause of death for people between the age of 3 and 34. Moreover,human error is the cause of over 90% of automobile accidents.   In addition the inefficiencies related with the automobile usage is staggering. Most automobiles sit unused more than 95% of their life span, and a freeway operating at maximum  efficiency has automobiles on only 5% of its surface. In congested urban areas, 40% of all gasoline used is spent when car looks for parking spaces. Furthermore, in some US cities, parking lots comprise more than third of the land, becoming the single salient landscape feature of our built environment.   Since its inception of the commercial auto industry in the late 1890s, cars have become increasingly safe and convenient. Recently, car makers have begun to introduce advanced driver-assistance systems such as adaptive cruise control (which automates accelerating and braking) and active lane assist (which automates steering). These systems have become capable enough that new luxury vehicles can drive themselves in slow moving highway traffics. Research into autonomous cars has progressed remarkably since the first demonstrations in the 1980s. In 2010, four driver less vans traveled from Italy to China. In august of 2012, google announced that its self-driving cars had completed over 300,000 miles of accident free autonomous driving. Although self-driving cars may still seems like science friction, Google, many industry analysts, auto suppliers, and car makers project that such cars will be available before 2020.                                                                      

saurabh kumar tiwari

saurabh kumar tiwari

 

CNG in India

Compressed natural gas(CNG) is a fuel that needs no introduction.  it is a cheap fuel to make and use, which is why it is so widespread in public transport. Not to mention that the second hand car market is greatly supported by CNG kits. vehicles like the Honda Civic, Accord and Toyota Corolla are favorites to be bought second hand and then have green fuel kits used to make them easy on the pocket. With diesel deregulation soon to kick in, the price of the oil will head north soon, so CNG seems like a good investment for those with regular usage. here's the brief look at advantages and disadvantages of CNG:   Advantages:   it is the green fuel. the emissions and hydrocarbons that are released as the by product of CNG usage are lesser than those created by regular fuel. Carbon monoxide emission are down by 70-85% while hydrocarbon levels are reduced by 40-60%. the price fluctuation of the natural gas is less. Look back over the past few years and you'll notice that petrol and diesel prices have been on roller coaster ride, but CNG has the relative linear movement. this is because of domestic production which has no dependency on international movements. Engine life improves.Contrary to popular beliefs, CNG is a better fuel for improving engine life as the carbon levels are greatly reduced.   Disadvantages: The performance of the car is reduced significantly. On an average CNG users experience a crash about 10% in performance.  The storage space is eaten up badly. CNG tanks a easily the size of large bag, so boot space is reduced or removes entirely as the fuel storage tank takes up all the room. Availability is not a wide spread as regular gas stations. Within the city users probably have a list of stations that falls in the route, but beyond that it is an uncertainty. This is the reason why cars aren't made to run exclusively on CNG. Blocked injectors. Cars with CNG kits should always be started on petrol and run for few kilometers before being switched to the green fuel. This warms up the engine better and gets the motor well lubricated. Petrol is expensive so drivers often chose not to use it.  Fuel range. Although CNG is a cheaper fuel, the actual range on just CNG is lesser than petrol. Not to mention, running on a close to empty tank reduces the pressure and increases the risk of valve bursting. So, even if the car uses CNG, it is always wise to keep a regular flow of petrol both in tank and in the engine usage.              

saurabh kumar tiwari

saurabh kumar tiwari

 

Desicant Cooling System

In the last 10 years, evaporative and desiccant cooling technology for air conditioning has increased as an alternative for air conditioning systems has increased as an alternative to the conventional vapour compression systems. A typical system combines a dehumidification system that uses a rotary desiccant wheel, with direct or indirect evaporative systems, allowing a filtered and cooled air supplying temperature, humidity and speed conditions that propitiate environmental thermal comfort, even in equatorial and tropical climates. These systems causes a lot of electrical power saving, mainly in place where thermal source energy source are easily found, where the price of electrical energy is high,where the latent heat percentage is high or where the needed air dew point is low. So, evaporative cooling systems that use absorption pre-dehumidification presents a great perspective in thermal comfort. It can be used in co-generation systems, where the needed heat to regeneration can be gotten from gas turbines exhaust gases or internal combustion engines or, still, from steam in plants that use steam turbine.                                                                                                                                                                                                                                                    

saurabh kumar tiwari

saurabh kumar tiwari

 

Experimental Analysis of an Air Washer

Hello World,   Today i will like tell you all about my 4th year project which was on the topic of experimental analysis of an air washer. In the recent sanario the peoples are slowly getting conscious about the beast(pollution) intended to destroy our beautiful sphere(earth). This pollution had drastically spread in our world drastically in few years. It is sad to say but we are only responsible for it. The careless burning of fossil fuels, heavy growth in industries and inventions without considering about the earth safety pushed of us into this undesirable situation.   But now the peoples are thinking about what they are doing and what they had done including the government which taken so many steps for the control on pollution. The scientist's also get conscious about their invention which will be in the favor the reducing pollution.     In India the refrigerants like R 22 is going to be banned in upcoming few years which is one of the major reason for the depletion of the ozone layer which causes global warming and some harmful skin disease's. These things created the requirement for the replacement of old cooling systems and introduction of the new inventions which are environment friendly.   My project was on the same concern me and my friends decided to try the project which can be the one of the substitute of the recent refrigeration system. On the suggestion of our professor we modified the air washer to not only work as an evaporative cooler but also can remove the sulphure dioxide from the air which is one of the gas responsible for green house effect.   In my project my team was using spray type air washer with the very simple design since it become easier to modify.                                                                                                                                                           The spray type air washers consists of a chamber or casing containing a spray nozzle system, a sink for removing the spray water as it falls. And an eliminator section for the removal of moisture in the air. A pump recirculates water at the rate higher than the evaporation rate.   Intimate contact between the spray water and the air flow causes heat and mass transfer between the air and the water. The air washer used in the industries has the basic use to clean air and control the properties of the air as per the requirement.   The air washer can perform two kinds of cooling: 1. Direct evaporative cooling 2.Indirect evaporative cooling   The direct evaporative cooling is done by the direct contact between sprayed water and the flowing air in the chamber. Where the indirect evaporative cooling is done by providing heat exchanger at the front of air washer. The syphon present in the heat exchanger is circulated by the cold water and the hot air is passed through the fins of the heat exchanger. Which causes heat exchange between air and water.   The indirect evaporative cooling was done in my project by the use of car radiator.
AIR WASHER SPECIFICATIONS
BLOWER                suction blower with 1HP, 3PHASE, 440 V and internal diameter 4 inch   NOZZLE SECTION                     the nozzle section consist of:-   1. 4 elbow joints (0.5 inch bore) 2. 3 distributors (0.5 inch bore) 3. 10 vertical pipes (0.5 inch bore & 50 cm length) 4. 10 holes on vertical pipe each (1 mm bore) 5. 5 holes on horizontal pipe each (1 mm bore)   All the components in the nozzle section are made up of PVC material.   The body of the air washer was made up of the aluminium composite pannel.  Two layers of simple cellulose pad was use in the eliminator section to absorb the moisture in the air.                                                                                                                                                                                                                                                                                                  The picture above will give you the brief and real understanding of the project.   The analysis was done with the following aims: 1. circulating the water at normal temperature and analyzing the changes in the property of the air 2. circulating hot water through air washer and analyzing the change in the properties of air 3. circulating chilled water through air washer and analyzing the changes in properties of air   I am providing some videos of working of my project i hope you will like it.   please give reviews on my publish and don't forget to follow. your reviews are precious to me and your following will motivate to share new views thank you.                                                                                               

saurabh kumar tiwari

saurabh kumar tiwari

 

Last Post -- Time to Hang It Up

Mechanics Corner
    A Journal of Applied Mechanics and Mathematics by DrD
    © Machinery Dynamics Research, 2017
Last Post
Time to Hang It Up    
This will be the final post of Mechanics Corner here on Mechanical Engineering Forums. It has run almost exactly two years, and there have been ups and downs along the way. In this final post, I want to reflect a bit on my original goals for the blog, and also on what has actually happened. When our host first proposed to me that I might write a blog for ME Forums, I was excited about it. About half of my career had been spent in engineering education, and I always loved working with students. It seemed like a way to get back to something that I had long enjoyed, and so I accepted his suggestion. A long time ago, back when I was about 14 or 15 years old, in Junior High School, my shop teacher mentioned, in an off-hand way in class, that various curves could be described mathematically. I’d never heard that before, but I thought immediately, “This has interesting possibilities.” Moving ahead a few years, I discovered that I wanted to study and build my career around was the area known as Applied Mechanics, although it was a time before I first heard that term. In my freshman physics class, I discovered the laws of motion, and thought to myself, “This is great stuff! I can use math to describe how things move!” All of that happened back in the 1950s, and I’m still doing the same thing today (some might say I am in a rut!). As a teacher, I taught mostly undergraduate engineering courses, although I taught my share of graduate courses as well. It was the undergraduate courses that I liked most, because I firmly believe that the economy of a nation is strongly dependent on the quality of the baccalaureate level engineers produced in that nation. Engineers with graduate degrees are valuable as well, but the vast majority of the national engineering workload falls to BS level engineers.    Thus, I envisioned Mechanics Corner as a sort of continuation of the several undergraduate courses I most enjoyed teaching — kinematics, dynamics of machines, vibrations, and mechanics of materials. For the most part, I have stuck to the plan, so that most of the technical posts I have made have dealt with problems that I considered suitable for undergraduate engineering students, say perhaps, junior level. I have posted a few topics from my industrial experience, but those have been situations that baccalaureate level engineers would be expected to handle. Now I knew it would not be exactly like continuing to teach my classes. In particular, you would not have any homework or tests, and I would not have any grading to do – a win-win, or so I thought. I did hope, that even with no assigned homework, readers would take an interest in the problems discussed, even to the point of working through the details for themselves (I was terribly naive, apparently!). I knew from my own experience that the only way I ever really learned a new idea was to get in and work with it, work some problems, make some numbers, plot some curves, until I really understood what it was all about. I’ll venture to say that nobody ever learned any technical material simply by reading only. In actual fact, in the early days, I had one or two folks say that they would in fact work through the problems, so I was encouraged. What I was not prepared for, however, was the fact that the vast majority never seemed to even read very carefully, much less work through the problems! The questions that have come, and there have been a few, have largely been about matters totally unrelated to the posts. The most common question has been, “Suggest a topic for my final project,” which relates to not a single post. Needless to say, that aspect of my vision was totally unfulfilled. But there is another side. I ventured to write a few “philosophical” articles, items dealing with academic integrity and cheating, with how to ask for help, with how to write a report or a paper, and various other matters. I really thought all of this would be considered obvious and trivial, so I was completely unprepared for the excitement that some of these articles generated. There were, in some cases, many, many comments, and people seemed to really be interested. I’m left to wonder: why? Are these ideas foreign to the culture of India and SE Asia? Are these things not all taught at home and in the public schools? I don’t know, but there was a lot of interest in these matters. But Mechanics Corner was intended to be primarily a technical blog, and there, it just did not excite the interest of the readership. As time passed, there was less and less interest. First, the comments dropped off to just about zero, and later, there were fewer and fewer who even bothered to “like” the articles. Finally, the number of reads has dropped to almost nothing (there may be no one left to read this final note). Well, there could hardly be any more clear indication that it is time to stop. I asked for opinions about this from some of the administrators, and was told that the blog was just over the heads of the readership. That makes me sad; that was never the intent. If it is true, I do not see how engineering has a very bright future among this readership. Even so, I wish all of you the best for your careers. I hope that you are able to find rewarding and beneficial work in which you will be happy and make a real contribution to your societies. To use an old cowboy metaphor perhaps familiar to many of you from Bollywood, “It is time to hang up the bridle and saddle, and say, ‘Adios’ (Adios is literally, “to God”).  

DrD

DrD

 

A Problem in Statics & Dynamics, #34

Mechanics Corner
    A Journal of Applied Mechanics and Mathematics by DrD, # 34
    © Machinery Dynamics Research, 2015
A Problem in Statics & Dynamics     
    
Introduction         A problem was recently posted on this Forum, requesting help, that has led me to consider a somewhat more general problem for this post. The scope of this post will include the original problem, although not by the method required there, but will also go beyond to a more general geometry. We begin here by stating the present problem; interested readers are invited to search back for the original problem posted 19 December, 2016, by iivii.
    

Assembly Drawing, with Dimensions   StatDynProb.pdf

DrD

DrD

 

FREE MECHANICAL ENGINEER DESIGN CALCULATORS

Mechanical Engineer calculator is one of the powerful free tool available in the INTERNET which can be used for calculation and design of various mechanical components like gear, lead screw, spring, beams, bearings, sprocket etc. This basic design calculator can save great deal of time taken by hand calculation for these mechanical components.
The calculator has simple graphic user interface for each mechanical component on different web pages which contains input and output display box. The user has to first select the component from menu bar located on top of this page and give correct values with appropriate unit in input display box to automatically calculate result in output display box.  http://www.mechanicalengineercalculator.com/ http://www.mechanicalengineercalculator.com/bevel-gear/ http://www.mechanicalengineercalculator.com/bearing-calculation/   FREE MOTOR POWER CALCULATION http://www.mechanicalengineercalculator.com/power-calculation/    

RAJ MHATRE

RAJ MHATRE

 

ACM Series Grinding Mill Manufacturer for AC Foaming Agent in China

Technical features Using the numerical simulation software to design a suitable crushing and split flow, optimize the grinding machine host and worm wheel air flow structure design Multi row and multi-layer device added to the machine to achieve multi-level material grinding Machine internal airflow channel and crushing area work independently Internal water cooling circulating device, suitable for grinding heat sensitive material (such as polyvinyl alcohol), It will not be deteriorated as the material temperature rised during crushing process, such as Crushed polyvinyl alcohol to produce "bubble" material and make the material color changed that affect the quality of products. At the same time also reduces the material flow with high rotation speed and friction into a ball, so that more difficult to crush. Installed power is small,Installed power one-fourth less than other similar models The pulverizing hammer and the gear ring is made of super hard alloy materials through special processing, easy-wear parts are made of wear-resistant processing, greatly improving the service life of the wearing parts, service life is 3-4 times than other similar models, and greatly reduce the iron impurities (widely used in this manner) A high degree of automation, the whole machine adopts the full closed negative pressure operation, the production environment is clean, no dust pollution, dust emission is less than 20mg/m3 (national environmental protection standard ≤35mg/m3), completely meet the national environmental protection requirements      Technical parameter   Applicable range of materials Nonmetal ore (graphite / calcium carbonate etc.), chemical (carbon black /ac foaming agent etc.), food (cocoa / soda etc.),Pesticide dilution powder 
(etcClassic case: wollastonite / attapulgite / diatomite / phosphate / ac foaming agent / ammonium phosphate / basic zinc carbonate / lithopone / silica / starch / meal / coco)   ACM pulverizer flowchart   

fenglichina

fenglichina

 

ACM Series Grinding Mill Manufacturer for Making Superfine Powder in China

1. In order to suit the mineralogical characteristics of wollastonites, vortes cutting and rolling methods are adopted as the main forces for mechanical grinding so as to protect the crystal formation of the wollastonites. The machine has a high length to diameter ratio (L/D=12-25:1). 2. The working gaps of the grinding accessories/devices are adjustable, so that needle-shaped wollastonite powder of different fineness can be produced (d97=13-220μm). When the grinding accessories/devices are worn, the correct working gaps can be mained by adjusting the relevant spacers so that mot only is the operational lift of the grinding accessories/devices extended, the quality of the product is also guaranteed. 3. The equipment has buit-in low-speed stage separation device(s), able to meet the required product fineness and to avoid over grinding of the product in the form of breakage of the "needles". 4. The use of electro-magnetic vibration feeding forms part of the automatic feed control system. This is responsive to the conditions of the grinding and blower motors, guaranteeing consistent feeding and best efficiency. 1. Our design idea is market-oriented and its goal is to increase customers’ satisfaction. Design according to the customers’ special requires. Achieve the perfect combination of rational investment and lower cost.
2.  According to related national standard strictly, we guarantee stable and reliable product quality with superb technique and technology.
3.  Control the production and examination of the parts and the whole machine strictly.
4.  The period of quality guarantee of the equipment is one year, but the whole machine is maintained for whole life. If we receive complaint from customers, we will respond immediately. And if necessary, we will send someone to the field at once.
5.  When technical breakthrough and improvement happen, we will do the correction and upgrade for customers with cost price only if customers will.
6.  Supply the blueprint of the product line and equipment details for free. http://www.fengli-china.com

fenglichina

fenglichina

 

ACM Series Grinding Machine Manufacturer for Baking Soda in China

The ACM/C series grinders are the result of our latest innovations (Patent Registration No.20031056858) and are specially designed for grinding heat sensitive materials. The range contains special grinding accessories/devices and features a coarse material re-grind system as well as are-blowing machinism. Specific features of the C series are as follows: 1. Ability to grind brittle materials that are prone to over-grinding, producing a "coarse" (d97>140μm), i.e. blow mesh 100) finished product with consistent granule size and even distribution. Suitable for grinding materials such as polyvinyl alcohol (PVA), with more than 80% of the total amount of retention for the neighbouring three sifting numbers (i.e. sifting meshes 40,60 and 80). 2. Has a re-blowing device, suitable for grinding heat sensitive chemical materials (such as PVA), ensuring that their properties will not deteriorat due to the temperature generated during grinding. This reduces the chance of materials forming spheres caused by high speed spinning and fricton-spherical materials are much harder to grind. 3. The granule size of the product is adjustable by adjusting the gaps between the grinding accessories/devices. The machine is capable of grinding both coarse materials (below mesh 100) and fine materials (above mesh 100). 4. Low cost-priced at less than 30% of similar imported machines.   The machine is suitable for grinding coarse or fine heat sensitive materials, capable of producing consistent granule size. It is therefore widely used in chemical, agro-chemical, foodstuffs, starch and Polyvinyl Alcohol production industries. These machines have demonstrated very stable performance and good reliability as evidenceed by a large number of installations in China's leading vinylon plants, silicon gel plants, and starch processing facilities, having completely replaced similar imported machine. The machine's main inner linings, whirlwind separator device, dust remover and pipe system are made of either alloyed carbon steel or stainless steel, depending on the specific industry for which the machines to be used. 1. Our design idea is market-oriented and its goal is to increase customers’ satisfaction. Design according to the customers’ special requires. Achieve the perfect combination of rational investment and lower cost.
2.  According to related national standard strictly, we guarantee stable and reliable product quality with superb technique and technology.
3.  Control the production and examination of the parts and the whole machine strictly.
4.  The period of quality guarantee of the equipment is one year, but the whole machine is maintained for whole life. If we receive complaint from customers, we will respond immediately. And if necessary, we will send someone to the field at once.
5.  When technical breakthrough and improvement happen, we will do the correction and upgrade for customers with cost price only if customers will.
6.  Supply the blueprint of the product line and equipment details for free.

fenglichina

fenglichina

 

ACM Series Impact Crusher Manufaturer for Iron Phosphate in China

Based on our ACM/A Series grinding machine, the ACM/B series grinders are part of our patented new generation innovative products (China Patent Registration No.ZL02268432.9). The machine is suitable for super-fine grinding of brittle materials. Materials are sucked into the grinder by a pressure differential created by the blower(s) within the system, thus successfully resolving the problems faced by punchaction grinders such as difficulties in grinding large but low-density materials. 1. Built-in separtion mechanism, product fineness can be adjusted according to needs-preventing over grinding. 2. Excellent for grinding materials that are large in size but low in density, such as AC foaming agents (d97=5μm), white carbon blacks, camphor powder etc. 3. Multilayered multiple grinding accessories/devices, high operational efficiency capable of achineving excellent product fineness and consistent granule sizes. 4. 40-50% energy savings, as compared with air-stream grinding machines for equivalent fineness and production volume. The machine is suitable for grinding materials that are large in size but low in density. It is widely in the chemical industry (such as for grinding AC foaming agents), as well as agro-chemical, dyestuffs, foodstuffs, non-metallic mineral industries. Different materials such as alloyed carbon steel, stainless steel etc. can be used for the machine's main inner linings, "whirlwind" separator device, dust remover and system, depending on the industry. 1. Our design idea is market-oriented and its goal is to increase customers’ satisfaction. Design according to the customers’ special requires. Achieve the perfect combination of rational investment and lower cost.
2.  According to related national standard strictly, we guarantee stable and reliable product quality with superb technique and technology.
3.  Control the production and examination of the parts and the whole machine strictly.
4.  The period of quality guarantee of the equipment is one year, but the whole machine is maintained for whole life. If we receive complaint from customers, we will respond immediately. And if necessary, we will send someone to the field at once.
5.  When technical breakthrough and improvement happen, we will do the correction and upgrade for customers with cost price only if customers will.
6.  Supply the blueprint of the product line and equipment details for free.

fenglichina

fenglichina

 

ACM Series Grinding Miller Manufaturer for Calcium Carbonate

The ACM/A series are highly efficient super-fine punch-action mechanical micro grinding machines of performing the complete process of material grinding, separation and making of the finished product within the same tightly integrated system. 1. Built-in separation mechanism-preventing over-grinding. 2. Able to produce uniform granules of required sizes by adjusting the speed of the stage-separation wheel(s) or by adjusting the strength of the blower(s). 3. Powerful blowing and strong self-cooling capability, suitable for grinding heat-sensitive materials. 4. Different grinding accessories/devices are used according to the hardness of the material being ground; different types of materials (alloyed carbon steel, stainless steel, ceramics etc) are available for the Machine's inner linings and product extracting system, meeting the needs of different industries. 5. Both manual and programmable auto-controlled machines available. The machine is suitable for super-fine grinding of various types of brittle materials. Material hardness (Mohs scale)<4, moisture contents<10%, input size 5-200mm (as decided by the model of the machine and material hardness). The machine is widely used coating materials and other industries. 1. Our design idea is market-oriented and its goal is to increase customers’ satisfaction. Design according to the customers’ special requires. Achieve the perfect combination of rational investment and lower cost.
2.  According to related national standard strictly, we guarantee stable and reliable product quality with superb technique and technology.
3.  Control the production and examination of the parts and the whole machine strictly.
4.  The period of quality guarantee of the equipment is one year, but the whole machine is maintained for whole life. If we receive complaint from customers, we will respond immediately. And if necessary, we will send someone to the field at once.
5.  When technical breakthrough and improvement happen, we will do the correction and upgrade for customers with cost price only if customers will.
6.  Supply the blueprint of the product line and equipment details for free.

fenglichina

fenglichina

 

FLM Series Stone Pulverizer Manufaturer for Petroleum Coke and Ash Lime

1. Application Material: Petroleum Coke
2. Feed size: ≤200mm  Moisture ≤5%
3. out size: 325mesh(D97), particle size can be adjusted. 
4. Output: shot coke 3t/h-4t/h ; sponge coke 4t/h-5t/h
5. Supply completed grinding machine (including crusher, conveyor equipment and grinding machine)
FLM-1000 grinding machine is suitable for petroleum coke, including crusher, conveyor equipment (including auger and powder pneumatic conveying),grinding machine. Simple process flow diagram(detail information is on attachment)     FLM-1000 petroleum coke grinding mill is the use of violent impact hammer / Blade / rods and materials and other high-speed rotation of the rotary body, while at the impact of the gap between the hammer and the liner impact / abrasion scissors cut, to achieve ultra-fine grinding powder.
   The model choose characteristics of petroleum coke , using the CFD fluid dynamics simulation software to calculate the most suitable flow field, pressure distribution to guide the design, improve the grinding efficiency, reduce energy consumption.
FLM-1000 grinding machine for petroleum coke feature: 1. Grinding machine is based on petroleum coke characteristics, using numerical simulation software to design the most suitable crushing and classifying flow field, to optimize main engineer system and turbo air classifier design, effective solution to the problem of adhesion, increased capacity and no large particle size appear; 2. The mill is good at small installed power, optimizing system structure, reducing energy consumption greatly, installed power lower than other similar models; 3. The mill is powerful blowing when running,also has a certain drying function on material; the device can dry material with 80-100 ℃ flue gas.
   Raw water is 9%, the finished powder moisture ≤3%;
   Raw water is 7%, the finished powder moisture ≤2.2%;
   Raw water is 5%, the finished powder moisture ≤1.5%; 4. The mill choose unique design and a constant flow field of gas-solid concentration control technology, a uniform particle size, narrow distribution, no large particle size, and to ensure the stable operation of the system a long time 5. Grinding hammer and ring use cemented carbide materials which made through a special process, the alloy wearing spare parts use abrasion treatment, which increase the service life of wearing parts, service life is 3-4 times than other similar models ,and greatly reduces the contamination of iron impurities; (this method has been very good in application a number of units)
   The mill choose unique protection disc design, effectively reduce the wear of the disc, greatly extending the life order. 1. Our design idea is market-oriented and its goal is to increase customers’ satisfaction. Design according to the customers’ special requires. Achieve the perfect combination of rational investment and lower cost.
2.  According to related national standard strictly, we guarantee stable and reliable product quality with superb technique and technology.
3.  Control the production and examination of the parts and the whole machine strictly.
4.  The period of quality guarantee of the equipment is one year, but the whole machine is maintained for whole life. If we receive complaint from customers, we will respond immediately. And if necessary, we will send someone to the field at once.
5.  When technical breakthrough and improvement happen, we will do the correction and upgrade for customers with cost price only if customers will.
6.  Supply the blueprint of the product line and equipment details for free.

fenglichina

fenglichina

 

MT Series Ring Roll Mill Manufacturer for Industrial Salt in China

The ring roller mill is our self-developed patent product (Patent Number: ZL02270593.7), by impact, extrusion, grinding and other principles of the material to crush. Step by step using centrifugall force grinding ring Shuaixiang grinding ring (stator) and rotating wall compression Juan, materials ring through the grinding mill ring gap, the impact ring by grinding, pressing, grinding and grinding, grinding ring are single or multi-layer distribution structure, the base may face for the face surface, grinding and more multi-ring, smashing face large, so crushing, high efficiency, the material fully, the product fineness good, the well-known experts and scholars found that the type of machine is advanced dry powders are finely ground non-metallic mining equipment. PLC control system, the use of man-machine interface control panel. Make more intuitive and convenient operation, high automation degree, so that the data acquisition and remote automation control.   Good Production Efficiency  1. Long bag off-line pulse dust collector: According to the characteristics of non-metallic mine superfine such as Calcium Carbonate, we integrated the advantages of sub-room cleaning and pulse jet cleaning technology, and develop the large efficient dust removal equipment with large amount of wind, good cleaning effect and low emission concentration. The ability of this equipment effectively enhance the extraction for more than 20%. 2. Good output and quality: Adopting unique design of the surface grinding vice and oblique grading blade wheel design to effectively reduce wind resistance and prevent the running of coarse particles. Choose a Transmission System Plan 1. The speed reducer drive, demand is high, suitable for powder particles a molding powder. High transmission efficiency, stable powder particle size uniform. 2. Belt drive: applicable to the powder particles requirements is not high or need to pass through the second watermill powder. Such as: paper powder, powder and desulfurization. Maintenance is simple and convenient. Choose a Powder Extraction System Solutions 1. Closed-circuit circulation system     Return air stream, improve the internal temperature, dry powder, not easy to plug a bag. At the same time can add active additives in grinding process, improve the quality of powder. The production of PVC powder. 2. Open system     Reduce airflow resistance, reduce energy consumption of the fan, the system installation is simple. Is suitable for the area using the humidity is low.   1. Our design idea is market-oriented and its goal is to increase customers’ satisfaction. Design according to the customers’ special requires. Achieve the perfect combination of rational investment and lower cost.
2.  According to related national standard strictly, we guarantee stable and reliable product quality with superb technique and technology.
3.  Control the production and examination of the parts and the whole machine strictly.
4.  The period of quality guarantee of the equipment is one year, but the whole machine is maintained for whole life. If we receive complaint from customers, we will respond immediately. And if necessary, we will send someone to the field at once.
5.  When technical breakthrough and improvement happen, we will do the correction and upgrade for customers with cost price only if customers will.
6.  Supply the blueprint of the product line and equipment details for free.

fenglichina

fenglichina

 

MT Series Ring Roller Mill Manufacturer for Graphite in China

The ring roller mill is our self-developed patent product (Patent Number: ZL02270593.7), by impact, extrusion, grinding and other principles of the material to crush. Step by step using centrifugall force grinding ring Shuaixiang grinding ring (stator) and rotating wall compression Juan, materials ring through the grinding mill ring gap, the impact ring by grinding, pressing, grinding and grinding, grinding ring are single or multi-layer distribution structure, the base may face for the face surface, grinding and more multi-ring, smashing face large, so crushing, high efficiency, the material fully, the product fineness good, the well-known experts and scholars found that the type of machine is advanced dry powders are finely ground non-metallic mining equipment. PLC control system, the use of man-machine interface control panel. Make more intuitive and convenient operation, high automation degree, so that the data acquisition and remote automation control. Good Production Efficiency  1. Long bag off-line pulse dust collector: According to the characteristics of non-metallic mine superfine such as Calcium Carbonate, we integrated the advantages of sub-room cleaning and pulse jet cleaning technology, and develop the large efficient dust removal equipment with large amount of wind, good cleaning effect and low emission concentration. The ability of this equipment effectively enhance the extraction for more than 20%. 2. Good output and quality: Adopting unique design of the surface grinding vice and oblique grading blade wheel design to effectively reduce wind resistance and prevent the running of coarse particles. Choose a Transmission System Plan 1. The speed reducer drive, demand is high, suitable for powder particles a molding powder. High transmission efficiency, stable powder particle size uniform. 2. Belt drive: applicable to the powder particles requirements is not high or need to pass through the second watermill powder. Such as: paper powder, powder and desulfurization. Maintenance is simple and convenient. Choose a Powder Extraction System Solutions 1. Closed-circuit circulation system     Return air stream, improve the internal temperature, dry powder, not easy to plug a bag. At the same time can add active additives in grinding process, improve the quality of powder. The production of PVC powder. 2. Open system     Reduce airflow resistance, reduce energy consumption of the fan, the system installation is simple. Is suitable for the area using the humidity is low. 1. Our design idea is market-oriented and its goal is to increase customers’ satisfaction. Design according to the customers’ special requires. Achieve the perfect combination of rational investment and lower cost.
2.  According to related national standard strictly, we guarantee stable and reliable product quality with superb technique and technology.
3.  Control the production and examination of the parts and the whole machine strictly.
4.  The period of quality guarantee of the equipment is one year, but the whole machine is maintained for whole life. If we receive complaint from customers, we will respond immediately. And if necessary, we will send someone to the field at once.
5.  When technical breakthrough and improvement happen, we will do the correction and upgrade for customers with cost price only if customers will.
6.  Supply the blueprint of the product line and equipment details for free.

fenglichina

fenglichina

 

What are hydraulic cylinders,working principles !!

Hydraulic cylinders haven’t really changed a lot over the years. The manufacturing processes are much more streamlined and the tolerances are much tighter, but for the most part cylinders are still the hard working push/pull tools they have always been. These things have literally shaped the world around us. Anything that gets lifted, pushed, hauled, dumped, dug, crushed, drilled or graded has gotten that way by some truck, crane, dozer or tractor using a hydraulic cylinder. But how do hydraulic cylinders work?
The amazing amount of force a cylinder exerts is due to the simple mechanical principle of pressure exerted on the surface area of the
piston . Simply put, the larger the diameter of the cylinder, the more it will lift. 

SK sharma

SK sharma

 

If There Is a Fastener There Will Be a Tool That Requires Access.

I get great satisfaction when working with my hands. When I do so I always ask why the item I am working on is as it is. One source of frustration I believe many have experienced it the lack of tool access. Sometimes n-1 fasteners are a breeze to access and the nth takes more time to remove than all the other combined. I don’t recall from my machine design class ever addressing this real world situation. I learned how to size bolts, bearings, and cross-sections but I don’t recall any mention of tool access. I learned there existed standards for tool access when I entered industry. In the auto industry one thing you tried to avoid was the need for special tool kits. These were not cheap and every automobile dealer and repair shop needs to purchase the special kits if they intend to make the particular repair. As much as this was avoided 30 years ago (and I assume still today) these special kits existed. While working in a different industry we were cleaning up a lab area. I came across an Allen Wrench (hex key) that did not make the usual 90 degree bend. It brought to mind the special kits I mentioned above. It had been modified to have a second bend nearly 90 degrees. I taped it to the wall in the design department with the following note. Do Not Design Anything That Needs a Tool Like This! There are reasons a lack of tool access happens. Parts designed for one application may have been created with adequate access. The same item is later used on a different application and the surrounding space is already accounted for. But there are cases where there simply is not enough thought applied or too many bean counters controlling the design function. As the Wyoming winter approaches there are things that need attention. Today two of those frustrations had to be addressed. I have a generator for times when power goes out and an ATV (all terrain vehicles) for snow removal. Both have batteries for starting. Battery removal is more difficult than it should be for both.The generator can be manually started but if needed when it is -20F (-29C) that can be quite an effort. For the ATV the battery is held in place with two screws and a padded flat metal bar across the width of the battery. This is an (n-1) example. One of the two screws has plenty of access and the other is under a plastic housing. What would make it more user friendly (for those who buy the products) would be to make the end of the retaining bar that is under the plastic housing, slip into a slot of some kind. The other end which is very accessible would use the one screw. This would eliminate one fastener, eliminate the captured nut or tapped hole (can’t see what is there) and make battery removal so much easier for little or no cost. My solution which could easily be incorporated at the factory was to cut a slot on the end of the bar with poor tool access. Doing so eliminated the need to remove the hidden fastener. Just loosen enough to slip the retaining bar out then back in. You can rotate the retainer but it must pass over the positive terminal and the bar is grounded to the frame. Better to remove it.  For the generator I speculate this is the multi application issue. The same design is sold with and without battery start. These options don’t come cheap and if as in the auto industry, have a handsome margin. So why punish the big spenders? The panel with all the outlets is welded to the frame. The panel extends quite a distance down to provide a billboard for the power rating. Behind the immovable plate lies the battery. Accessing the battery retainers and cables would be simple if the lower portion of the plate was either detachable or eliminated. Since I don’t transport the generator I leave the retainers off. Access to the cables is still more difficult than it need be. So for those who have not yet entered industry let these two examples provide food for thought when you are designing equipment. Many small improvements can be incorporated for little or no cost prior to production release of the design. Those about to enter industry seek out the senior engineers and ask for the standards books. Spend some time, even your own time, skimming through the manuals. They contain thousands of man-years of experience. Also spend time in the manufacturing and service facilities if possible. These efforts will provide an insight to what is not taught in class. Photo 1 Is a top down view of the battery retainer.  Photo 2 You can see the hidden fastener and the modification to the retainer. Photo 3 Is the generator. The bottom half of the battery can be seen. Photo 4 Is the side view of the battery. Photo 5 Shows the bottom half of the battery more clearly than photo 3.  

JAG Engineering LLC

JAG Engineering LLC

 

MACHINE DESIGN :- 40 POSSIBLE QUESTIONS

1. What are the differences between true stress, engineering stress, proof stress.
2. What do you men by factor of safety and what is its significance
3. What do you mean by Young’s modulus, modulus of rigidity and bulk modulus.
4. What do you mean by resilience.
5. What is pure torsion and what do you mean by flexural igidity.
6. What is the difference between endurance limit stree and endurance strength.
7. What do you understand by efficiency of riveted joint.
8. What is caulking and fullering in riveted joint.
9. What do you mean by stress conc. Factor and what are the methods to reduce stress conc.
10. Why stress conc. Is more serious in brittle materials. 11. What do you mean by fatigue .
12. Springs are subjected to which type of streses.
13. What are the difference between through bolt, tap bolt and stud.
14. What is check nut and what is the function of washer.
15. Cotter and knuckle joints take which type of load and where they are used.
16. What are the difference types of couplings and what is their function.
17. What is the function of key and which type of stress they are subjected to?
18. Generally shafts are subjected to which type of stress.
19. What are the difference types of mechanical drives and which is the best for different situations.
20. What is the function of a bush why it is phosphor bronze.
21. What are difference types of threads and which threads are used for power transmission and why.
22. Why the pulley arms are elliptical in cross section and it is made up of cast iron.
23. Why it is required to change the all V belt if one of them is broken.
24. Why V belts transmit more power than flat belts.
25. What is the meaning of 6*37 or 6*7 in a rope drive.
26. What do you mean by pinion sprocket and wheel sprocket and which one is used for driving shaft.
27. What is the function of flywheel and why its material is cast iron.
28. Why the leaf springs are laminated as reducing length.
29. What is the function of clutch and is the difference between uniform wear and uniform pressure.
30. Now a days which type of clutches are used in automobiles. 31. Why disc brake is more efficient than mechanical brake.
32. What is the function of bearings and what are the different types.
33. What is bearing characteristics number and bearing modulus.
34. What is the significance of the digits of a rolling contact bearing number 6304?
35. Which type of gear drive is used for perpendicular transmission of power?
36. Why helical gears transmit more power than spur gears.
37. What do you mean by different terms like back lash, pressure angle, circular pitch in a gear drive.
38. Why involute tooth profile is better than cycloid tooth profile?
39. What is interference in gear drive and how to avoid it?
40. What do you mean by law of gearing

saurabhjain

saurabhjain

 

Over Engineered or Over Designed?

I recall many years ago first hearing the term Over Engineered. It rang a sour note but I had not given it much thought. I still hear this said today about older equipment. For instance the DC Generators at Pratt Institute in Brooklyn NY have been in operation for over 100 years. http://inspectapedia.com/heat/Steam_Systems_Pratt_Milster.php I had the opportunity a few years ago to visit my alma mater. To my surprise and delight the Chief Engineer who provided the tour of the facility to my class in about 1977 was still on the job as was the equipment. But I digress. Over Engineered is often brought up when speaking about 1950’s vintage American automobiles. “They don’t build them like that anymore”. They don’t build them like that anymore because they don’t design like they use to. When I worked in the auto industry in the late 70’s and early 80’s engineering was in good part “seat of the pants” designing. A lot less analysis than one would expect. Two-D CAD was just getting introduced. There was extensive testing before production. What a lack of analysis left unknown, testing –often brutal testing- would reveal. If a component broke it was made stronger by adding more material or eliminating tight radii or other stress concentration features. Whether the rest of the system was just good enough or 10 times stronger than needed was an unknown. Over time components that never failed were targets for cost reduction. This also was not as analytical as it is likely today. Getting back to the subject of this blog, I would offer that the "weaker" a device is, the more it was engineered. Weaker, because it is designed closer to the expected loads. This of course is aside from shoddy design work.  For greater strength the addition of material will usually achieve this. For an item like the generators at Pratt added weight can also help with vibration. The penalties are the onetime cost of added material and greater shipment weight. Adding more material globally to a system such as a rocket, aircraft and to today’s automobile is forbidden. This requires much move engineering. I hope I have provided a better understanding of the term Over Engineered and realize it is really a misleading expression. Equipment back then was Over Designed because the factors of ignorance were much greater just a few decades ago.

JAG Engineering LLC

JAG Engineering LLC

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