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How to determine the form of the hydraulic cylinder cushioning mechanism
Apr 29,2021
Different hydraulic cylinders require different cushioning devices. So, how do you determine the right cushioning mechanism? First, we can determine it based on the requirements for the change in piston linear velocity during the hydraulic cylinder's operation. If slight pulsation is allowed during deceleration, then a milled groove type or stepped type cushioning mechanism can be used.
If the deceleration process has strict requirements, then we need to choose a cushioning mechanism that is close to constant deceleration, such as a multi-porous cylinder or multi-porous plunger type. If the hydraulic cylinder is allowed to withstand a certain amount of pulsation during deceleration, then a conical or double conical type cushioning mechanism can be used.
It should be noted that the flow capacity of the check valve in the selected cushioning device must not be too low, otherwise, the ideal effect may not be achieved in practical applications. For example, if the cushioning device is not designed properly, it may cause the hydraulic cylinder to suddenly stop or reverse when starting from the side with the cushioning device. Therefore, the flow capacity of the check valve should be fully considered when designing the cushioning device.
This is because only by ensuring that the check valve has sufficient flow capacity can this problem be avoided. When selecting a hydraulic cylinder, we need to verify its cushioning capacity. We must also consider whether the maximum cushioning pressure will cause the cylinder's stress to exceed the allowable strength.
Usually, during testing, we first set the pressure of the hydraulic cylinder to 1.5 times its rated pressure. If the cushioning pressure exceeds this value or the cushioning capacity does not meet the requirements, other cushioning measures need to be taken, such as using a relief valve to control the cushioning pressure, or using a decelerator.
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