The origin pressure is 0.8Mpa, and the cylinder is controlled by two-position five-way double electric solenoid valves. The cylinder vertical speed is too fast and unstable. What should I do?

There are actually two problems with your cylinder speed regulation, and the answers are as follows.

First, do you use a real speed control valve to adjust the speed of the cylinder?

1。 The speed regulating valve consists of an adjustable throttle valve and a one-way valve in parallel. When adjusting, the cross-sectional areas of the inlet and outlet are different, and the fluid is only controlled in one direction, that is, the gas flow and pressure entering the cylinder are not limited (the role of one-way valve), and the gas discharged is controlled and adjustable (the role of throttle valve). Also known as one-way throttle valve. (Please see the following figure, the schematic symbol of the speed regulating valve in the schematic diagram of the cylinder keeping synchronous motion).

Therefore, it is necessary to throttle the other cavity of the cylinder (the gas end to be discharged) to make it deflate slowly or quickly, forming back pressure damping, thus effectively stabilizing the forward speed of the cylinder, which is the speed regulating valve.

Therefore, to slow down the rising speed of the cylinder, turn down the speed regulating valve of the upper exhaust (don't move the lower part); To slow down, turn down the speed regulating valve for exhaust below (don't move above); On the contrary, turn it up a little. In general, press the speed regulating valve at the port.

A medium pressure of 0.5Mpa is designed, and you use a pressure of 0.8Mpa, so you should choose a speed regulating valve smaller than the matching port 1~2 to adjust the speed (there is a copper sleeve transition in the middle).

2。 Someone uses a throttle valve (adjustable) as a speed regulating valve, and the requirements are not high. However, no matter how a single throttle valve is adjusted, the cross-sectional areas of the air inlet and the air outlet are always the same. Therefore, the intake and exhaust of the valve are adjusted at the same time, the gas is inflated and contracted, and it is difficult to coordinate the adjustment of the front and rear valves, so the speed regulation is unstable. There is a big difference.

3。 The exhaust muffler throttle valve (installed on the exhaust port of the solenoid valve) is used to adjust the cylinder speed. Speed regulation is very limited and unstable.

I hope you choose the right 1? The speed regulating valve (with schematic symbol in the figure below) is installed on the cylinder, and the speed is adjusted as I said. I'm sure it will bring good results.

Second, you use two cylinders to support a steel plate frame (oil pipe), and the speed regulating cylinder is too fast and unstable.

Because the two cylinders and a steel frame are rigidly and fixedly connected together, the up-and-down movements of the cylinders should be very synchronous, so as not to affect the steady speed. Therefore, you should combine the solenoid valves, speed control valves and pipelines that control the two cylinders to run synchronously, and you will see the results of the steady speed control valve. Please see the attached figure "Schematic diagram of controlling two cylinders to keep synchronous motion"?

Maybe your airway is not exactly the same, for your reference. I wish you success in speed regulation!