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Factors that cause cylinders to crawl or slip
Aug 27, 2018

(1) The internal cylinder of the hydraulic cylinder is stagnant. The internal parts of the hydraulic cylinder are improperly installed, the parts are deformed, the wear or the shape is over-limit, and the action resistance is too large, so that the piston speed of the hydraulic cylinder changes with the stroke direction, and there is a snagging or slipping. Most of the factors are due to damage in the parts and equipment, and there are scratches on the surface or iron chips generated by sintering, which reduces the speed of resistance increase. For example, the piston is not the same as the piston rod or the piston rod is bent. The hydraulic cylinder or the piston rod has an error in the orientation of the guide sleeve device, and the guide ring is too tight or too loose. The solution is to re-adjust, replace damaged parts and remove iron filings.

(2) Poor smoothness or poor machining of the cylinder bore diameter. Since the piston and the cylinder, the guide sleeve and the piston rod have relative movements, if the smoothness is poor, the inner wall of the hydraulic cylinder is rough or the diameter of the hydraulic cylinder is too poor, the wear will be aggravated, and the center line of the hydraulic cylinder will be linearly reduced. When the piston is operated in the cylinder, the frictional resistance will be large and small, causing snagging or slippage. The sweeping method is to first grind the inner wall of the hydraulic cylinder, and then manufacture the piston as required, repair the piston rod, and equip the guide sleeve.

(3) The hydraulic pump or hydraulic cylinder enters the air. The compression or expansion of the air in the hydraulic cylinder creates a piston slip or sag. The cleaning measures are to check the hydraulic pump, set up a special exhaust device or design to return oil to the tank for a full stroke of reciprocating air several times.

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