Analyze the reasons why the hydraulic cylinder action fails
The hydraulic cylinder is an actuator in the hydraulic system that converts hydraulic energy into mechanical energy. The faults can be basically summarized as hydraulic cylinder malfunction, inability to push the load, and piston slipping or crawling. It is not uncommon for equipment to shut down due to malfunctions. Therefore, attention should be paid to fault diagnosis and use and maintenance.
1. Hydraulic cylinder malfunction or malfunction due to the following reasons:
(1) The valve core is stuck or the valve hole is blocked. When the flow valve or directional valve spool is stuck or the valve hole is blocked, the hydraulic cylinder is prone to malfunction or malfunction. At this time, you should check the contamination of the oil; check whether dirt or colloid deposits are stuck on the valve core or block the valve hole; check the wear of the valve body.
(2) The piston rod and cylinder tube are stuck or the hydraulic cylinder is blocked. No matter how you operate it at this time, the hydraulic cylinder will not move or move very little. At this time, you should check whether the piston and piston rod seals are too tight, whether dirt and colloid sediment have entered: whether the axis line of the piston rod and cylinder barrel is aligned, and whether wearing parts and seals have failed.
(3) The control pressure of the hydraulic system is too low. The throttling resistance in the control pipeline may be too large, the flow valve is improperly adjusted, the control pressure is inappropriate, and the pressure source is interfered with. At this time, the control pressure source should be checked to achieve pressure adjustment to the specified value of the system.
(4) Air enters the hydraulic system. Mainly due to leaks occurring in the system. At this time, you should check the liquid level of the hydraulic tank, the seals and pipe joints on the suction side of the hydraulic pump, and whether the suction strainer is too dirty. If so, the hydraulic oil should be replenished, seals and pipe joints should be processed, and the coarse filter element should be cleaned or replaced.
(5) The initial movement of the hydraulic cylinder is slow. When the temperature is low, the viscosity of the hydraulic oil is relatively high and the fluidity is poor, causing the hydraulic cylinder to move slowly. Solution: Replace the hydraulic oil with better viscosity and temperature performance. At low temperatures, you can use a heater or the machine itself to heat it to increase the oil temperature at startup.
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1. Hydraulic cylinder malfunction or malfunction due to the following reasons:
(1) The valve core is stuck or the valve hole is blocked. When the flow valve or directional valve spool is stuck or the valve hole is blocked, the hydraulic cylinder is prone to malfunction or malfunction. At this time, you should check the contamination of the oil; check whether dirt or colloid deposits are stuck on the valve core or block the valve hole; check the wear of the valve body.
(2) The piston rod and cylinder tube are stuck or the hydraulic cylinder is blocked. No matter how you operate it at this time, the hydraulic cylinder will not move or move very little. At this time, you should check whether the piston and piston rod seals are too tight, whether dirt and colloid sediment have entered: whether the axis line of the piston rod and cylinder barrel is aligned, and whether wearing parts and seals have failed.
(3) The control pressure of the hydraulic system is too low. The throttling resistance in the control pipeline may be too large, the flow valve is improperly adjusted, the control pressure is inappropriate, and the pressure source is interfered with. At this time, the control pressure source should be checked to achieve pressure adjustment to the specified value of the system.
(4) Air enters the hydraulic system. Mainly due to leaks occurring in the system. At this time, you should check the liquid level of the hydraulic tank, the seals and pipe joints on the suction side of the hydraulic pump, and whether the suction strainer is too dirty. If so, the hydraulic oil should be replenished, seals and pipe joints should be processed, and the coarse filter element should be cleaned or replaced.
(5) The initial movement of the hydraulic cylinder is slow. When the temperature is low, the viscosity of the hydraulic oil is relatively high and the fluidity is poor, causing the hydraulic cylinder to move slowly. Solution: Replace the hydraulic oil with better viscosity and temperature performance. At low temperatures, you can use a heater or the machine itself to heat it to increase the oil temperature at startup.
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