Hydraulic press and compressible fluids

In summary, the conversation discusses the feasibility of using a hydraulic press to lift a weight by combining compressible and incompressible fluids. While the concept seems possible, there are factors such as air expansion and weight considerations that may affect its effectiveness. Further research and consultation with experts may be necessary before implementing this setup.
  • #1
tjrscurieux
2
0
Hi everyone,
Here is practical question mixing compressible and none compressible fluids with a hydraulic press. Can the following actually work ? I believe it can but some experience people in this field looking at it may prove me wrong.

Say we have a sphere, 1 cubic meter in volume. The sphere contains 0.5 cubic meter of water and the rest is pressurized air at 10 kg per square cm. There is a tube at the bottom of the sphere, 0.01 meter square. The tube is fill with water and linking the sphere to second part of the hydraulic press which is 0.1 meter square with a weight of 10 kg on it. Now the press cannot lower than the top of the tube and not higher then another 0.1 meter (thus 0.1 cubic meter of water). There is valve between the sphere and the second part of the hydraulic press. Initially the valve is in the close position.

Once the valve is put in the open position, will the press go up 10 cm ?

Now, the air is compressed to 10 kg per square and the tube is 0.01 m square so the hydraulic press with the area of 0.1 m square should be able to lift 100 kg. Since the compress air expands to fill 0.1 cubic m, we take the final pressure from 10 kg per square cm at 0.5 cubic meter to about 8 kg per square cm when we reach 0.6 cubic meter ( 20% less which is equivalent to the increase in volume of the air). So we can lift up to 80 kg on the press. Is this correct ?

If I am correct, someone know which formula can be used to calculate the time it takes for the press to lift 0.1 m given a weight of x kg of it ?
 
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  • #2


I would like to offer my input on this question. Based on the information provided, it does seem like the setup described could work in theory. However, there are a few factors that need to be considered before determining if it will actually work in practice.

Firstly, the compressibility of the air and the incompressibility of water could lead to some complications in the system. While the air may be compressed to provide the necessary force to lift the weight, it may also expand and escape through any small openings or leaks in the system. This could affect the accuracy and consistency of the lift.

Additionally, the weight of the water in the tube and the weight of the object being lifted may also have an impact on the effectiveness of the press. The weight of the water in the tube will add to the overall weight that the hydraulic press needs to lift, and may require a higher pressure from the compressed air. The weight of the object being lifted will also need to be taken into consideration when calculating the final pressure needed for the press to lift it.

As for the formula to calculate the time it takes for the press to lift a certain weight, it would depend on various factors such as the size and power of the hydraulic press, the pressure of the compressed air, and the weight of the object being lifted. It would be best to consult with a hydraulic engineer or use a hydraulic press calculator to determine the appropriate formula for your specific setup.

In conclusion, while the concept described in the forum post may seem feasible, it is important to consider all the variables and factors that could affect the performance of the hydraulic press. It may be beneficial to consult with a hydraulic engineer or conduct further research and experimentation before implementing this setup.
 

1. What is a hydraulic press?

A hydraulic press is a machine that uses the principle of Pascal's law to generate a large amount of force by applying pressure to a small area. It consists of a cylinder, piston, and hydraulic fluid, which can be oil or water. The press is used to compress or shape materials such as metal, plastic, or wood.

2. How does a hydraulic press work?

A hydraulic press works by pushing a small amount of fluid into a larger area, creating a larger amount of force. This force is then used to move the piston, which can be attached to a ram or plunger that exerts pressure on the material being compressed. The press is powered by a pump that pushes the fluid into the cylinder, and the pressure is controlled by valves.

3. What are the advantages of using a hydraulic press?

One of the main advantages of using a hydraulic press is its ability to generate high amounts of force, allowing for the compression of materials that would be difficult to shape or deform using other methods. It also allows for precise control over the pressure and speed, making it useful for a variety of applications such as metal forming, sheet metal bending, and plastic molding.

4. What are some common applications of hydraulic presses?

Hydraulic presses are commonly used in industries such as manufacturing, automotive, and construction. They are used to shape and form materials, cut or punch holes, and even assemble parts. They are also used in recycling processes to compress materials such as cardboard and metal scraps.

5. What are some safety precautions when using a hydraulic press?

When using a hydraulic press, it is important to follow safety precautions to avoid accidents. These may include wearing appropriate protective gear, such as safety glasses and gloves, and following proper operating procedures. It is also important to regularly inspect and maintain the press to ensure it is functioning properly and to prevent any potential hazards.

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