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Hydraulic drive system pressure is not normal? Follow the Dalan hydraulic motor for diagnostic analysis

2019-09-05
For large precision and expensive hydraulic equipment, the fault diagnosis and elimination of the hydraulic transmission system is very important. The wrong diagnosis will inevitably lead to economic loss such as high repair cost, long downtime and reduced production efficiency.
For large precision and expensive hydraulic equipment, the fault diagnosis and elimination of the hydraulic transmission system is very important. The wrong diagnosis will inevitably lead to economic loss such as high repair cost, long downtime and reduced production efficiency. Therefore, to ensure the normal operation of the Hydraulic System, it is necessary to ensure that the pressure is normal, it is necessary to master the knowledge of the diagnosis and elimination of the fault.

1, familiar with the working principle of the system

The most important point of detection and troubleshooting is to understand how the system works. First of all, you should be familiar with the capacity of the system, but also familiar with the reasonable working pressure, but also understand the performance of the equipment, carefully read the manual, consult the equipment operation record and fault file, and access the operator's working conditions and abnormal phenomena before and after the equipment failure. . And conduct on-site observation, comprehensive analysis and serious consideration of the above situation, and then diagnose and eliminate the fault.

2, hydraulic transmission system failure

Common faults in the commissioning phase are: the valve core is stuck or the movement is inflexible, causing the actuator to malfunction, the external leakage is serious, the moving speed of the actuator is unstable, the pressure is unstable due to the blockage of the damping orifice, and the control caused by the leaking spring seal is caused. Failure, poor design of the hydraulic system, improper selection of hydraulic components, resulting in poor synchronization accuracy of the system's heating actuators.

Late faults in operation: Due to the difference in operating frequency and load of the hydraulic components, the wearing parts have been subjected to normal wear and tear, resulting in a high failure rate.

3, troubleshooting steps

Hydraulic transmission equipment is not working properly, and can be classified into three major problems of flow, pressure and direction.

The diagnostic steps are: review the hydraulic circuit diagram, check the hydraulic components, and initially assess the quality status; list the fault-related components one by one; and list the components listed in the list according to the difficulty and order of the components;

4, diagnostic technology

Simple diagnostic techniques are: see, listen, touch, smell, read, and ask. Look at pressure, speed, oil, leaks, vibration, and products. Listen to noise, cavitation and trapped oil abnormal sounds, impact sounds, and knocking sounds. Touch the temperature rise, vibration, crawling, and tightness. Whether the oil smells bad and whether the rubber parts emit a special smell. Read the equipment technically related to fault analysis and maintenance records, maintenance and so on. Ask whether the hydraulic system works normally, the hydraulic oil replacement time, whether the regulating valve has been adjusted before the accident occurs, whether the seal or hydraulic parts have been replaced, and what abnormal phenomena have occurred. The sophisticated diagnostic technology is mainly based on the quantitative analysis of the test instrument to find out the cause of the failure.

5. Fault diagnosis analysis of abnormal pressure

In the hydraulic transmission system, the working pressure is not normal. The main result is that the working pressure cannot be established, and the lifting pressure is not increased. Sometimes the pressure does not fall down after the pressure rises, so that the working parts cannot be operated normally, and even the moving parts are in the original position.

One of the main manifestations of hydraulic transmission system pressure is insufficient pressure. The main reasons are: Hydraulic Pump failure, hydraulic pump drive motor failure, pressure valve failure, etc., hydraulic system pressure is not normal and hydraulic Pumps and Pressure Valves are closely related.

Parts that are too large due to wear and tear are repaired according to the repair process. If it can not be repaired, it should be replaced with new parts; when installing and debugging the hydraulic pump, be sure to read the instruction manual carefully and strictly implement the installation and commissioning process regulations.

6. Maintenance of hydraulic transmission system

The most important point of inspection and troubleshooting is to be familiar with and master the hydraulic system and working principle. You should be familiar with the structure and working characteristics of each component. There are several simple and basic maintenance methods in the maintenance of hydraulic systems that have a large impact on the performance, efficiency, and life of the hydraulic system.






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