What are the fault diagnosis methods for tank hydraulic jacking system?

At the production site of the tank hydraulic jacking system, due to the constraints of the production plan and technical conditions, the fault diagnosis personnel are required to accurately diagnose the faults of the hydraulic equipment, and the maintenance personnel are required to use the existing information and the technical conditions of the site. Minimize the workload of disassembly and assembly, save maintenance man-hours and costs, accurately find out the fault location and the cause of the failure and repair it, so that the tank hydraulic jacking system can resume normal operation.

Here is the content list:

l  General principles of tank hydraulic jacking system fault diagnosis.

l  The specific method of tank hydraulic jacking system fault diagnosis.

l  To summarize the fault diagnosis of tank hydraulic jacking system.

General principles of tank hydraulic jacking system fault diagnosis.

Correct analysis of tank hydraulic jacking system failures is the prerequisite for troubleshooting. Most tank hydraulic jacking system failures do not occur suddenly. There are always signs before they occur. When the signs develop to a certain extent, the failure will occur.

The reasons for the failure of the tank hydraulic jacking system are various and there is no fixed pattern to be found. Statistics show that about 90% of tank hydraulic jacking system failures are caused by poor management. In order to diagnose failures quickly, accurately and conveniently, it is necessary to fully understand the characteristics and laws of tank hydraulic jacking system failures, which is the basis of fault diagnosis.

The following principles are worth following in the fault diagnosis of tank hydraulic jacking system:

①　First, determine whether the working conditions and peripheral environment of the tank hydraulic jacking system are normal, and check whether the various conditions of the tank hydraulic jacking system meet the requirements of normal operation.

②　Area judgment Determine the area related to the fault based on the tank hydraulic jacking system fault phenomenon and characteristics, and gradually reduce the scope of the fault.

③　Master the types of tank hydraulic jacking system faults and conduct a comprehensive analysis. According to the final phenomenon of the fault, gradually find out a variety of direct or indirect possible causes.

④　When verifying possible causes of failure, generally start from the most likely cause of failure or the most easily inspected place, which can reduce the workload of assembly and disassembly and increase the speed of diagnosis.

⑤　Establish a fault analysis table for the equipment operation tank hydraulic jacking system, which is a high-level summary of the use experience and helps to quickly make a judgment on the fault phenomenon.

The specific method of tank hydraulic jacking system fault diagnosis.

l  The traditional method of finding hydraulic system faults daily is logical analysis and gradually approaching fault.

When the hydraulic system fails, there are many possible causes of the failure. Using the logic algebra method, list the possible failure causes, and then make logical judgments one by one according to the principle of easy first and then difficult, approach item by item, and finally find out the cause of the failure and the specific conditions that caused the failure.

l  Fault diagnosis system based on parameter measurement

The idea of diagnosing faults by parameter measurement method is based on the fact that when any tank hydraulic jacking system is working normally, the system parameters are working near the design and set values. If these parameters deviate from the preset value during work, the system will malfunction or may malfunction.

That is, the essence of the failure of the tank hydraulic jacking system is the abnormal change of the system working parameters. During the measurement, there is no need to stop the machine or damage the hydraulic system. Almost any part of the system can be tested. Not only can the existing faults be diagnosed, but also online monitoring and potential faults can be predicted.

To summarize the fault diagnosis of tank hydraulic jacking system.

Apply the traditional logical analysis stepwise approximation method. It is necessary to analyze, judge and inspect all the above possible causes one by one, and finally find out the cause of the failure and the specific component that caused the failure. The diagnosis process of this method is cumbersome and requires a lot of assembly and disassembly, verification work, low efficiency, long construction period, and can only be qualitative analysis, the diagnosis is not accurate enough.

Application of fault diagnosis tank hydraulic jacking system based on parameter measurement. When piping the tank hydraulic jacking system, set a double ball valve and three ports at the outlet a of the pump, the front b of the reversing valve, and the inlet c of the cylinder, and the fault diagnosis detection circuit can be used to limit the system fault within a few seconds. In a certain area, the fault is diagnosed based on the measured parameter value.

Through the detection, the final cause of the failure is the serious internal leakage of the vane pump. After disassembling the pump, it was discovered that the vane pump stator caused abnormal wear due to poor lubrication, which caused internal leakage to increase and the tank hydraulic jacking system pressure did not increase. It was further discovered that the water in the water cooling tank hydraulic jacking system leaked into the oil, causing the oil to emulsify and lose its lubrication effect.