Analysis and Handling of Common Problems in Spiral Hydraulic Rotary Actuators (IV): Failure to Maintain Position After Rotation to Specified Angle
Release time:
2025-12-02 09:20
Source:
In the practical application of hydraulic rotary actuators, "failure to maintain position after rotating to the specified angle" is a typical fault that affects equipment positioning accuracy and production stability. This problem will cause the hydraulic rotary actuator to fail to stably lock at the preset angle, which in turn leads to process deviations, product quality defects and other chain reactions. Therefore, accurately analyzing the causes and implementing effective solutions is of great significance to ensure the normal operation of the equipment.
From the root cause of the fault, the failure of the hydraulic rotary actuator to maintain position after rotating to the specified angle can be attributed to the following three core reasons, and corresponding countermeasures can be taken for each reason:
First, internal leakage of the control or balance valve. To address this, we need to first disconnect the hydraulic pipeline and bypass valve, open the oil port on the valve block, and drive the actuator through the oil port on the cylinder barrel (note that the operating pressure must not exceed the equipment's set pressure). If there is a steady and continuous flow of hydraulic oil from the valve surface oil port, it indicates that the valve block has an internal leakage problem, and the valve block must be replaced in a timely manner to restore the sealing performance and pressure stability of the hydraulic circuit.
Second, leakage of the piston rod or end cover main seal. The oil pipe on the valve block and the oil plug on the cylinder barrel should be removed first, and hydraulic oil should be introduced from the oil port on the cylinder barrel for a pressure holding test. For the pressure holding test, the pressure should be increased to the factory-set pressure of the actuator and maintained for ten minutes. Observe whether there is continuous hydraulic oil gushing out from the oil ports on both sides or external leakage. If there is a leakage, the damaged seal must be replaced in a timely manner to ensure the cylinder body is tightly sealed.
Third, air trapped in the actuator. The core to solving this problem is to completely remove the air from the system. First, introduce hydraulic oil normally and let the hydraulic rotary actuator operate in reciprocating cycles 20 times to fully agitate the hydraulic oil in the circuit and release dissolved or trapped air. Then, open the spare oil port on the actuator housing or the test oil port on the valve block, and close the oil port after all air bubbles have escaped to complete the air release operation and restore the pressure stability of the hydraulic circuit.
When handling this type of fault, it is necessary to follow the principle of "first investigating simple causes, then handling complex components" to avoid secondary damage caused by blind disassembly. At the same time, attention should be paid to the maintenance of the hydraulic system in daily use: regularly inspect the working status of control valves and balance valves, and replace aging seals in a timely manner; standardize the hydraulic oil filling process to avoid air mixing; conduct regular pressure holding tests to reduce the probability of faults from the source and extend the service life and positioning accuracy stability of the hydraulic rotary actuator.
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