Society of Robots - Robot Forum

Mechanics and Construction => Mechanics and Construction => Topic started by: MC on July 15, 2011, 06:36:33 AM

Title: hydraulics info
Post by: MC on July 15, 2011, 06:36:33 AM

Hello

I am an electronics guy and have little knowledge about hydraulics
i am building a robot which has a capability to lift things
i know for a small robot i wouldnt require a hydraulic circuit but if i replicate it into a big machine used to carry slightly heavy load where hydraulics come into play, i would like to know how do i determine the specs for the motor and the pump based on the load that i will carry .

Help would be appreciated

Thanks

Title: Re: hydraulics info
Post by: zachsradios on September 11, 2011, 11:46:19 AM

hi can you help me out then. im trying to come up with a hydrulic sytem so the robot can be like a mini front loader

Title: Re: hydraulics info
Post by: RITESH29 on October 05, 2011, 11:25:50 AM

Hi,
I also want help on hydraulic compressed gas upto 6bars pressure for lifting robot as load ....

Title: Re: hydraulics info
Post by: Fr0stAngel on October 06, 2011, 10:38:21 PM

wel.. industrially, usually three types of actuation forces are used...electro-magnetic (motors) , pneumatic (air) , hydraulic (oil).

the thing about hydraulics and pneumatics  is that they are costly. and like motors, you need to keep in mind the design parameters of your project in order to use them properly. Hydraulic and pneumatic pressure is used via piston-cylinder arrangement (usually).
select a cylinder diameter.
since Force = pressure * area. determine the maximum load (load=force) your cylinder needs to bear (both axially and vertically, if the load is not entirely vertical), add factor of safety , and you have your operating pressure.
(usually, the load and operating pressure is known[determined by pump output] , and a suitable area is selected)

with hydraulic and pneumatic systems, you also need a reservoir/accumulator that would supply pressure so that:
-pump/compressor won't run continuously
-to meet transient load demands
-to make the piston reach a safe point in case of power failure. etc

lastly, you would need control valves to control the direction and flow of the fluid , and hence the cylinder.
 That's about as simple as i can put it.There are more things, but the above are the most basic. try google for more info, i'm sure you can find much more.

Title: Re: hydraulics info
Post by: RITESH29 on October 07, 2011, 10:02:50 AM

HI again,

You can see the use of lift in this video..after 2min in manual robots...