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Do you understand speed control of cylinders?

2018-07-12View Original

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I often encounter engineers asking questions like this: What factors affect the speed of a cylinder? How can the speed of the cylinder be increased to speed up the operation of the equipment? The speed of the cylinder is primarily influenced by the flow rate in the pneumatic system; a higher flow rate results in a higher speed. Factors affecting flow rate include the rated flow rate of the directional control valve (the Cv value or effective cross-sectional area S), the size of the air pipe connectors, the length of the air path from the solenoid valve to the cylinder, and the speeds of intake and exhaust air. Another important factor that affects the speed of the cylinder is the cylinder’s load rate! Therefore, to increase the speed of the cylinder, use: a directional control valve with high flow capacity; thicker air tubes and larger connectors; reducing the distance between the valve and the cylinder; using a quick-release valve. More importantly, reduce the load on the cylinder (think about it – if a cylinder with a output force of 1000 N is trying to push something with a resistance of 900 N, its speed simply cannot be increased!) ) Additionally, if possible, increase the inlet and outlet ports of the cylinder. The highest speed that cylinders can currently achieve is 3 m/s (such as SMC MQML*H type low-friction metal-sealed cylinders)
Reply #22018-07-17
It seems that the faster the speed, the better it isn’t – device stability also needs to be taken into account!
Reply #32018-07-17
Yes, I was too vague in my writing; it wasn’t precise enough. Thank you for pointing that out!
Reply #42018-08-18
Don’t we have a speed control valve now? Some big brands like SMC have them.
Reply #52018-08-19
If the actuator is too large or the valve operates too slowly, a pneumatic amplifier (accelerator) is generally used, requiring only minor modifications to the existing gas circuit. It’s very convenient. Except for venting or emergency shutdown. Normal processes do not require valves to open quickly. It’s not very useful

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