Information Foreword

Hydraulic drive systems are used today in a wide variety of industrial applications with process adaptability, superior control performance and lower manufacturing costs. Hydraulic drives also increase the freedom and control of equipment operation while also extending Service life. However, the same as other industrial equipment, if the main components, auxiliary quality is not too hard, the operation of the existing problems or improper maintenance, and the system of components and working fluids are in a closed circuit state, it is difficult to visually see the problem , Nor can it be judged by the usual parameter display of testing instruments. Technicians usually only take the working parameters of limited pressure gauges, flow meters and other equipment as the basis for preliminary diagnosis, and it is particularly difficult to determine and handle the faults further.

Of course, there are two kinds of sudden and non-sudden failure of the hydraulic system , of which the non-sudden occupy the main body, the fault occurred before accompanied by some omen, but the omen caused by a variety of reasons there is no law, then why there is failure What happened? These omens usually appear in what form? Through these signs, how to determine the technical staff and find out the problem? In the process of troubleshooting, we should pay attention to what details? Read this article, this series of difficult problems may not be solved!

Diagnosis explain

First of all, the hydraulic equipment is a unified body consisting of machine, electricity, liquid and instruments. The failure analysis of the system may be influenced by many factors. This is the difficulty of diagnosis. If you want to solve this problem, you must Through the analysis of the failure to clarify its working principle and structural characteristics, and then make further judgments based on the phenomenon of failure, so there is a purpose, direction, the planned step-by-step and narrow the scope of the final region to determine which parts, parts and even which elements have problems .

Common failures of hydraulic system include abnormal pressure display, abnormal flow display, hydraulic shock, abnormal working condition, excessive vibration and noise, excessive oil temperature, oil leakage, creeping, hydraulic clamping and cavitation, etc. Xiao Bian will be selected from the eight categories of common failures to be systematically explained:

(A) vibration and noise

It is particularly common for hydraulic systems to experience noise and vibration. Vibrations are likely to come from mechanical systems, oil pumps and motors, valve components, and fluid in pipes , which can affect not only the performance of the host but also the breakdown . The solution to this type of failure is to minimize or control all vibration sources during installation, maintenance and use , especially in the resonance of control valves and piping.

Noise is common in hydraulic systems. Such noises often sound like no regularity or irregular combination of sound sources. The sources may include: ( 1) the quality of the oil pump and oil motor is poor; (2) air enters the hydraulic system , Resulting in "hole phenomenon" noise; ③ fluid on the valve body wall caused by the impact; ④ due to the valve body caused by the pressure difference between the two oil connections hydraulic shock, making the pipeline and pressure vessel trigger Vibration noise; ⑤ mechanical system vibration caused by noise. To minimize the occurrence of noise, it is necessary to analyze the above sources one by one to implement preventive measures one by one.

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