In order to avoid the piston hitting the cylinder head at both ends of the stroke, producing noise, affecting the accuracy of the workpiece, and even damaging the machine parts, the two ends of the hydraulic cylinder in the hydraulic pump station system are often installed with a buffer device. Its function is to use the principle of oil throttling to achieve the braking of moving parts. Commonly used buffer device: annular clearance type, throttle adjustable, throttle variable three forms. The surface of the piston rod may also be sticky with a large number of dust, clay and other accessories, such as wholesale hydraulic cylinder accessories, many of which will appear some harder substances. Therefore, the piston rod of the hydraulic cylinder may leak due to various factors. One of the reasons for leakage is the unreasonable seal structure of the combined shaft.
