The reasons for the crawling of the hydraulic cylinder of the four-column hydraulic press

As an important driver of the hydraulic system of the four-column hydraulic press, the hydraulic cylinder's performance directly affects the stability of the hydraulic system, especially for the four-column hydraulic press with high performance requirements, the stability of the hydraulic cylinder is very important to the hydraulic system.

When the piston rod of the four-column hydraulic press is stretched and retracted under the action of hydraulic pressure, the hydraulic cylinder will crawl, causing uneven speed, vibration and abnormal noise of the slider of the four-column hydraulic press, causing the vibration of the entire hydraulic system, causing other parts of the main body to vibrate, resulting in production. danger.

This paper introduces the reasons for the four-column hydraulic cylinder crawling.

1. The hydraulic cylinder of the four-column hydraulic press crawls due to the intrusion of air in the cylinder: the hydraulic oil of the four-column hydraulic press is mixed with gas, the volume changes with the pressure, the gas explodes instantly under high pressure, and the speed of the hydraulic cylinder becomes unstable.

2. The design clearance of the hydraulic cylinder of the four-column hydraulic press is not appropriate to cause crawling: the sliding clearance between the piston inside the hydraulic cylinder and the hydraulic cylinder, the piston rod and the guide sleeve is too large, causing uneven pressure on the sliding surface and uneven friction. , causing the hydraulic cylinder to crawl; when the parts are manufactured with tolerances, the pressure on the sliding surface is uneven, and the friction force is uneven, causing the hydraulic cylinder to crawl.

3. Crawling caused by uneven friction of the guiding components in the hydraulic cylinder of the four-column hydraulic press: the size of the non-metallic support ring is uneven, the size of some non-metallic support rings increases or decreases with the change of oil temperature, and the size in the oil is stable The difference in performance directly causes the change of the fitting clearance, which causes the speed of the hydraulic cylinder to become unstable.

4. Due to the material problem of the sealing material, the hydraulic cylinder of the four-column hydraulic press is crawling: the commonly used sealing materials for hydraulic cylinders are NBR, polyurethane rubber, PTFE, etc., due to the hardness, strength, and followability of the material. friction with the sliding surface.

5. Influence of machining accuracy of parts: The machining accuracy of the inner wall of the cylinder and the surface of the piston rod has a great influence on the low-speed stability of the cylinder. For the four-column hydraulic cylinder with long stroke, the straightness of the inner wall of the cylinder and the surface of the piston rod is the main factor affecting the low-speed stability of the hydraulic cylinder.

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