How to determine the form of hydraulic cylinder buffer mechanism?

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2023-05-30

We need to choose different buffer devices for different hydraulic cylinders. So, do you know how to determine the suitable buffer mechanism? Firstly, we can determine the requirements for the linear velocity change of the piston based on the working process of the hydraulic cylinder. If the deceleration process is required to allow for micro pulses, a milling groove or stepped buffer mechanism can be used.
If there are strict requirements for the deceleration process, then we need to choose some buffer mechanisms that are close to constant deceleration, such as porous cylinder barrels or porous plunger types. If the hydraulic cylinder is allowed to withstand a certain pulse during the deceleration process, buffer mechanisms such as conical or double conical can be used.
It should be noted that the flow capacity of the one-way valve in the selected buffer device should not be too low, otherwise it may not achieve the desired effect in practical applications. For example, if the buffer device is not designed reasonably, there may be a sudden stop or retreat phenomenon when the hydraulic cylinder starts from the side with the buffer device. Therefore, when designing the buffer device, the flow capacity of the one-way valve should be fully considered.
This is because only by ensuring that the one-way valve has sufficient flow capacity can this problem be avoided. When selecting hydraulic cylinders, we need to verify their buffering capacity. At the same time, it is also necessary to consider whether the maximum buffering pressure generated will cause the stress of the cylinder to exceed the allowable strength.
Usually, when conducting experiments, we first set the pressure of the hydraulic cylinder to 1.5 times its rated pressure. If the buffering pressure exceeds this value or the buffering capacity cannot meet the requirements, additional buffering measures need to be taken, such as using an overflow valve to control the buffering pressure or using a deceleration valve for buffering.

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