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wipnel

Linear actuator

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Hello,

I am attempting to build a machine with a telescopic linear actuator as part of it. I have found a prototype that seems to be an ideal mechanism I am looking for, but I am unsure on how it works. Does anyone have any idea about the design details that make an actuator like this function? Any help is appreciated, thanks.

 

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If that's the air pressure gauge on a side, than it must have some sort of an air pump. If so, I'm guessing the capacity of this thing wouldn't be high. I mean it wouldn't be able to lift a car by itself. 

I'm guessing there is an air pump and some sort of an air bag (so that it could expand).

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There are many ways that such a device can be made, and what Jek says may be the way this one works. It can also be done with a ball screw powered by a small electric motor. Without more details, no one will be able to say with certainty how t this one works.

DrD

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Wipnel, There are 5 general types of linear actuators which turn rotational motion into linear motion. (Hydraulic, Mechanical, Magnetic, Pneumatic, Electric). I think the best way to find out how his prototype works is to comment on the video or email him to ask if its a motor or pressure gauge at the side of it. 

Would high precision lead screws and a stepper motor work for your project? Its the most common type of electric actuator, but we will need more details about what you are building. For example, lead screws aren't recommended for high speed applications. 

Zane

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This is a geared electric actuator, with sync stages for extension, meaning all stages move simultaneously.   Honestly the key factors for you you seems like the following

1) Collapsed height, 2) Max stroke for final length, 3) connection, this design only really works for a straight vertical RAM lift. 4) Load- what is real initial load and the dynamic load including acceleration, ie dynamics 101.

In the end there are tons of excellent actuators on the market, but key on these is speed, mm/sec and load  newtons (dynamic).  Also environmental conditions: out door, in door, salt spray,  IP sealing rating

and finally, same load mount issues as a hydraulic cylinder,  clevis clevis with spherical rod mounts-   

Info shown is pretty basic but not applicable to a actual real world move a load application,

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