The advantages of pneumatic machines are...
We will explain these advantages and lots of other interesting information to you in the Strong Pneumatics building set. In addition, we will show you how pneumatic components function. We will explain the individual components step by step, and show you how they work. In addition, the building set includes lots of different example models that illustrate how pneumatics are used.
A pneumatic system consists of five sub-systems.
Compressed air can be generated using a compressor or air pump and stored in compressed air tanks and other pressure vessels.
Observe:The piston rod can only be pressed in a short way. Do you know why?
Explanation:Since you are holding air connection A closed with your finger, the air in the cylinder cannot escape. However, the air can be compressed. Because of this, you can push the piston rod in slightly. The more air is compressed, the greater the pressure in the cylinder will be. You can measure this pressure using a manometer. The unit for pressure is “bar” or “Pascal”. You can also calculate the amount of pressure. The formula for calculating pressure is:
Explanation:When you set the switch of the manual valve to the centre position, the connections are closed and the air cannot get through.
Observe:The air will always flow through connection A when you turn the blue switch on the valve to the right, and through connection B when you turn the switch to the left.
Explanation:The image helps you understand how air flows through the valve when you turn the switch in the different directions. The blue line is the compressed air flowing through the valve. The black lines show how the air that returns from the cylinder will flow.
Build the functional model and complete the following experiments:
As you can see, the exhaust throttle helps you adjust the extension or retraction speed of the cylinder.
But what happens if the scissors lift has a bigger load to carry, such as a cup or a book? Can you still move the platform lift upward? Try to find out how much weight you can place on your platform lift so that it can still lift the weight straight up. Enter the values in the following table.
Develop and build your own pneumatic clamping device with one cylinder (without building instructions). Do you have an idea how it could work? If not, you can find our suggestion in the building instructions.
After you built the model, you probably switched on the compressor and turned the switch on the valve.
Switch to the right = clamp
Switch in centre position = hold clamped
Switch to the left = release clamp
If you have switched the compressor back off again, you can correctly clamp a workpiece in your pneumatic clamping device in task 2 (block 30).
Compressor is switched off.
1. Turn the valve switch to the centre position
2. Insert the workpiece.
3. Switch on the compressor
4. Turn the valve switch to the right
5. Turn the valve switch to the centre position
6. Switch the compressor off
Now, your workpiece is pneumatically clamped for processing.
You might ask: “Why should I move the switch to the centre position?”
Every pneumatic connection and every line loses a little bit of air. In the centre position, the line to the compressor is disconnected and the compressed air loss from it is reduced.
To open the clamping device on the first model all the way, you would have to turn the compressor back on. This is time-consuming, don’t you think? In the first model, your compressor was connected directly to the centre connection of the manual valve without an air reservoir. In our next model, we will install two air reservoirs. This means that the compressed air for this model will not be fed directly from the compressor to the manual valve, but rather to the other cylinders. These cylinders are then filled with compressed air and store it.
Now, add two cylinders to your simple model as air reservoirs. If you don't know how exactly to add the air reservoirs to your model, use the building instructions.
After you have converted your model, insert your workpiece (block) into the clamping device. Turn the switch on the manual valve to the centre position. Switch the compressor on and watch how the pistons in the cylinder move upward while they fill with compressed air. If the compressor makes a constant humming noise, it has built up enough pressure and you can switch it back off.
Now comes the moment when your conversion pays off.
The valve switch is in centre position, pressure accumulator is filled and the compressor is switched off.
1. Insert the workpiece
2. Turn the valve switch to the right
3. Turn the valve switch to the centre position --> workpiece is clamped
4. To release it, you simply have to turn the valve switch to the left
Did you notice the difference from the first model? The cylinder is completely retracted during releasing, without switching the compressor on again. You can even clamp and release the workpiece a second time. Do you know why?
Your compressor can store additional air volume in the two cylinders as a reserve, then deliver it to the clamping cylinders as needed.
All of these topics and experiments have taught you a bit more about the world of pneumatics. As you can see, pneumatics is a very interesting and useful field. In the next section, you can try out the toy models in the Strong Pneumatics building set.
In addition to the functional models, the Strong Pneumatics building set includes three other models with exciting and fun functions. These are realistic models of a front loader, brush grubber, and dual rotary windrower. Here as well, you can add the compressor to your model and connect it to your pneumatic valves and cylinders. You can then use the manual valves, for instance, to control the gripper arm on your brush grubber by hand. The throttle valve also lets you control the speed of the movements for a realistic function.
However, in reality functions like this are not carried out using pneumatic, but rather hydraulic systems. Oil is used in hydraulic systems to move the cylinders instead of air. In contrast to air, the oil cannot be compressed. This means that significantly higher forces can be transmitted. However, the pneumatic force is sufficient for your toy models in the Strong Pneumatics building set. Pneumatics is also especially clean, fast, reliable, and above all exciting.
We hope you enjoy building and playing.