1. The hydraulic cylinder of the four-column hydraulic machine crawls due to gas entering the cylinder: gas penetrates into the gear oil of the four-column hydraulic machine, and the volume changes with the working pressure. The gas explodes instantly under high pressure, and the speed of the hydraulic cylinder becomes increasingly unstable.
2. Improper design clearance of the hydraulic cylinder of the four-column hydraulic machine causes crawling: the rolling clearance between the piston rod and the hydraulic cylinder, the piston and the guide sleeve inside the hydraulic cylinder is too large, resulting in uneven shear damage pressure and uneven sliding friction. If the parts are produced uniformly, the hydraulic cylinder will crawl; when there are tolerances in the production of parts, the shear damage pressure will be uneven, and the sliding friction will be uneven, causing the hydraulic cylinder to crawl.
3. Crawl caused by uneven sliding friction of the guide components in the hydraulic cylinder of the four-column hydraulic machine: non-metallic material support rings are uneven in size. The size of some non-metallic material support rings increases or decreases with changes in temperature. The size of the hydraulic oil The difference in stability immediately causes changes in the assembly clearance, causing the hydraulic cylinder speed to become increasingly unstable.
4. Due to the material problem of rubber seals, the hydraulic cylinder of the four-column hydraulic machine is crawled: Common rubber seals of hydraulic cylinders include nitrile rubber, polyurethane rubber, polytetrafluoroethylene, etc. Due to the problems of material strength, compressive strength and tracking, Directly related to the sliding friction of the rolling surface.
5. Impact on parts processing and measurement accuracy: The dimensional accuracy of the inner cavity of the cylinder head and the surface of the hydraulic cylinder has a great impact on the low-speed reliability of the engine block. For four-column hydraulic cylinders with relatively long strokes, the parallelism between the inner cavity of the hydraulic cylinder head and the surface of the hydraulic cylinder is an important factor that determines the reliability of the low-speed gear of the hydraulic cylinder.
