| The hydraulic transmission is a transmission form in which the liquid is used as a working medium for energy transmission.As the main actuator of the hydraulic transmission system,the hydraulic cylinder plays a vital role in the performance of the output.Hydraulic cylinders often have a large amount of momentum during movement.When the stroke reaches the end,there will be a strong impact.If there is no reasonable buffering device,it will generate large vibration and noise,shorten the service life,and damage the hydraulic cylinder and related conditions when the situation is serious.device.Therefore,the stroke cushioning performance of the hydraulic cylinder is extremely important for its performance.With the continuous development of magnetic materials,the magnetic field performance of permanent magnets is also constantly improving,and magnetic materials are widely used in various fields.Firstly,the magnetic basic parameters and magnetic calculation theory are expounded,and the magnetic theory analysis of Halbach permanent magnet array is emphasized.The structural design of the composite buffer device is carried out.The magnetic field strength and magnetic force analysis of different permanent magnet geometric models are carried out by Maxwell simulation software to determine the model with better comprehensive performanceThen,the buffering process of the hydraulic cylinder composite buffer structure is mathematically modeled,and the flow characteristics and piston rod motion characteristics of different stages of buffering are analyzed.The two-dimensional model of the composite buffer device is established.The magnetic buffer,throttling buffer and composite buffer process are simulated by Comsol multi-physics simulation software.The time-acceleration curve is obtained.The buffer effect of the composite buffer structure is better than that of the throttling buffer.Magnetic buffering.Finally,the experimental system is built according to the hydraulic cylinder buffer experimental test principle.The hydraulic cylinder buffer structure and the overall structure of the hydraulic cylinder and the buffer pressure test of the hydraulic cylinder were completed.Comparing the two sets of experimental results,at the inlet pressure of 1.6 MPa,the pressure in the buffer chamber of the throttling buffer structure rapidly drops from the peak value of 0.95 MPa to 0 MPa,and the peak value of the buffer chamber pressure of the composite buffer structure is 0.9 MPa,and then the pressure decreases at a relatively rapid rate.The decrease is slower near the end of the stroke,indicating that the pressure change performance of the composite buffer structure is more gradual.In this paper,the composite buffer structure is innovatively designed.Through the design comparison experiment,it is concluded that the composite buffer structure has a certain effect on the buffering of the hydraulic cylinder terminal. |
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