Diagnosis and treatment of pneumatic cylinder faults

1.The piston rod and cylinder are stuck or the pneumatic cylinder is blocked. At this time, no matter how it is operated, the pneumatic cylinder will not move or move very little. At this time, check whether the piston and piston rod seals are too tight, whether dirt and colloid sediments have entered: whether the axis of the piston rod and cylinder is aligned, and whether the wearing parts and seals are invalid.

2. The valve core is stuck or the valve hole is blocked. When the flow valve or directional valve core is stuck or the valve hole is blocked, the pneumatic cylinder is prone to malfunction or malfunction. At this time, check the oil and gas pollution; check whether dirt or colloid sediments are stuck in the valve core or blocked in the valve hole; check the wear of the valve body.

3. The control pressure of the pneumatic 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 not appropriate, and the pressure source is disturbed. At this time, check the control pressure source to ensure that the pressure is adjusted to the specified value of the system.

4.The initial movement of the hydraulic cylinder is slow. Under low temperature conditions, the viscosity of the hydraulic oil is high and the fluidity is poor, resulting in slow movement of the hydraulic cylinder. The improvement method is to replace the hydraulic oil with better viscosity-temperature performance. At low temperatures, the oil temperature can be raised by using a heater or the machine itself to heat the oil at startup.

5.Air enters the pneumatic system. This is mainly because there is a leak in the system. At this time, check the air level of the hydraulic oil tank, the seals and pipe joints on the suction side of the hydraulic pump, and whether the suction filter is too dirty. If so, add hydraulic oil, handle the seals and pipe joints, and clean or replace the filter element.