How can I use Pneumatic Muscles as Hydraulic Muscles?

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Discussion Overview

The discussion revolves around the conversion of pneumatic artificial muscles into hydraulic muscles using water as the working fluid. Participants explore the necessary components, such as pumps and safety measures, while addressing the implications of using different fluids in muscle actuation.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant inquires about the feasibility and method of converting pneumatic muscles to hydraulic ones, specifically asking for pump recommendations.
  • Another participant suggests that changing the working fluid from air to water is feasible, noting that using pneumatics can provide speed while hydraulics can offer power.
  • Concerns are raised about the dangers of air trapped in a hydraulic system, emphasizing the need for a method to vent air to prevent potential hazards.
  • A recommendation is made to add antifreeze to the water to reduce corrosion and prevent freezing, which could damage the system.
  • A suggestion is made to first create a muscle prototype to measure the load and determine the necessary fluid volume and pressure before selecting a pump.
  • Discussion includes the possibility of using one pump with multiple valves or individual pumps for each muscle, along with a question about the energy source for the pump.
  • The original poster confirms they will use a motor to drive the pump, although they mention the motor may need to be upgraded later for better performance.

Areas of Agreement / Disagreement

Participants generally agree on the feasibility of converting pneumatic muscles to hydraulic ones and the importance of safety measures, but there are varying opinions on the specifics of pump selection and system design.

Contextual Notes

Participants have not reached a consensus on the best pump type or specific design configurations for the hydraulic muscle system, and there are unresolved considerations regarding load measurements and safety mechanisms.

Warren Pnigel
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Hi everyone, this is my first post
I was wondering how can I turn a pneumatic artificial muscle into a hydraulic one using water.
http://www.instructables.com/id/How-to-make-air-muscles!/ These are the air muscles I was planning on using.
What sort of pump would I need? Please be specific as I'm not very experienced with this.
Thanks!
 
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Welcome to PF.
There is no obvious problem changing the working fluid from air to water.
If you want speed, use pneumatics with a high pressure reservoir. If you want power use hydraulics with a low pressure reservoir tank and pump.

Air trapped in a hydraulics system can reduce rigidity and increase danger. That is because the compressibility of gas can store more energy than a liquid. With air in the system a hose failure can empty the hydraulic fluid very rapidly. There must be a way to vent air from the system.

Add car radiator antifreeze = ethylene glycol 33% to your water, 67%. It will reduce corrosion in your pump and valve system. It also prevents freezing in winter which can damage valves and will also help identify the source of leaks.
 
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Thanks! Just for the point of using hydraulics, I'd like to use hydraulics :D even though it sounds dumb. Can you recommend a fast pump at all?
 
I think your first move should be to make a "muscle" and identify the magnitude of the load that will be applied to the muscle. From that position you can measure the volume of fluid and the pressure needed to actuate the mechanism as the length changes. You will then be in a position to select a pump. You will also need some form of pressure relief or safety valve to protect the muscle.

There are a couple of topological possibilities, you could have only one pump but several valves, one valve for each muscle, or you could have a pump for each muscle, without any valves. Will the energy to drive the pump come from an electric motor?
 
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Yes, I'll drive the pump with a motor. I already have a motor laying around which I'll use for testing, but it's not very strong. I'll probably upgrade it later.
 
Thankyou for taking the time to reply to this thread as well, you've helped me a lot! :)
 

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