Study On The Buffering Process Of A New Hydraulic Cylinder Cushioning Device

As one of many hydraulic actuators,hydraulic cylinders are used in many industries in the industry.In the case that the hydraulic cylinder pushes the load with a large mass and the moving parts are relatively fast,the impact of the piston on the end cap is large,resulting in severe impact and noise,which may cause damage to hydraulic components or even the system.Therefore,some hydraulic cylinders need to be equipped with cushioning devices to relieve shocks.Now there are many types of buffers for hydraulic cylinders,and their effects are also varied.The commonly used hydraulic cylinder cushioning devices are installed and processed at both ends of the hydraulic cylinder.Different buffer structures will have different buffering effects.A hydraulic cylinder cushioning device with an additional pressure shut-off valve is a cushioning structure with a pressure shut-off valve added to the ring-shaped cushioning device.When the hydraulic cylinder enters into the buffering stage,the gap between the buffer sleeve and the end cap cavity is used.When the oil flows through the gap,the buffer cavity generates back pressure,and the maximum pressure of the buffer chamber is limited by the pressure shut-off valve to achieve the purpose of smooth buffering.And on the basis of the fixed buffer buffer device,we improved it and designed a new type of floating buffer device to reduce the processing difficulty.The first chapter briefly describes the common types of hydraulic cylinder cushions,the development of hydraulic cylinder cushions at home and abroad,and the major problems and opportunities facing hydraulic cylinder cushions.It also explains the significance of the new hydraulic cylinder cushioning device.And background.Guide the content and implementation steps of the project.In Chapter 2,due to the variability of the shape of the annular gap in the buffering process,the mathematical model of the annular gap flow is needed to build the AMEsim element model of the annular gap,and then build the overall system model.So this chapter established in detail the mathematical model of the three stages of flow state changes in the buffering process(local loss stage,sharp edge throttling stage,and slit-throttle stage),which provides the mathematical theory basis for the next chapter of the AMEsim software simulation model.Chapter 3,using the mathematical model of the three stages of flow state change during the buffering process of the previous chapter,builds the overall test systemmodel of the hydraulic cylinder cushion device.By comparing the advantages and disadvantages of these hydraulic cylinder buffer models with AMEsim software,an optimal buffer device combining external buffer device and built-in buffer device was designed,and the influence of structural parameters on buffer effect in the buffer device was analyzed.A set of optimal structural parameters makes the hydraulic cylinder cushion device designed in this paper have the best cushioning effect.Chapter 4,based on the fixed buffer buffer device,improved on the basis of the design of a new type of floating buffer buffer device.By using the COMSOL software to simulate the flow field of the two buffer sleeve model structures in the four positions(initial position,local loss position,gap throttle position and end position),it can be seen that the floating buffer buffer device and the ideal fixed buffer buffer The device basically has the same buffering effect.The new type of floating buffer sleeve still has a good buffer effect in the case of reducing the processing difficulty.