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Shanghai Jugong Hydraulic Technology Co., Ltd.

Contact: Manager Zhang

Mobile: 13671968158 /13681692048

Tel: 0512-53401911 Fax: 0512-53401911

E-mail: jugongyeya@163.com

Website: www.maponbulk.com

Zip code: 215400

Address: No. 91 Yinchuan Road, Taicang City, Suzhou, Jiangsu, China


Hydraulic system commissioning and common fault analysis

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Hydraulic system commissioning and common fault analysis

Release date:2015-06-12 00:00 Source:http://www.maponbulk.com Click:

Diagnosis and elimination of common faults in hydraulic systems


1 Diagnosis method for common faults


    Hydraulic equipment is a combination of mechanical, hydraulic, electrical and other devices, so the failures are also diverse. A certain fault phenomenon may be caused by many factors. Therefore, the analysis of hydraulic faults must be able to understand the hydraulic system schematic diagram, have a general understanding of the role of each component in the schematic diagram, and then analyze and judge according to the fault phenomenon. The causes of failures caused by many factors need to be analyzed one by one, and the main contradictions can be grasped to better solve and eliminate them. The flow of working fluid in components and pipelines in the hydraulic system is difficult to understand by the outside world, so it brings more difficulties to analysis and diagnosis. Therefore, people are required to have strong ability to analyze and judge faults. Identify the causes and locations of the faults in the complex relationships of mechanical, hydraulic and electrical and eliminate them in a timely and accurate manner.


 1.1 Simple fault diagnosis method


    The simple fault diagnosis method is the most common method currently adopted. It relies on the personal experience of the maintenance personnel to use the simple instrument to solve the faults of the hydraulic system, and to objectively use the methods of asking, watching, listening, touching, smelling, etc. to understand the system work. Analyze, diagnose, and determine the cause and location of the fault. The specific practices are as follows:


    1) Ask the equipment operator to find out how the equipment is operating. These include: whether the hydraulic system works normally; whether the hydraulic pump is abnormal; the time and result of the cleanliness of the hydraulic oil; the cleaning and replacement of the filter; whether the hydraulic components are adjusted before the fault occurs; whether the sealed components are replaced; What are the abnormalities in the hydraulic system before and after; what problems have occurred in the system in the past, how to eliminate them, etc., need to understand one by one.


    2) Look at the actual condition of the hydraulic system and observe whether there are problems with system pressure, speed, oil, leakage, vibration, etc.


    3) Listen to the sound of the hydraulic system, such as: impact sound; pump noise and abnormal sound; determine whether the hydraulic system works normally.


    4) Touch the temperature rise, vibration, creep and the tightness of the joint to determine whether the working condition of the moving parts is normal.


    In short, the simple diagnosis method is only a simple qualitative analysis, which has a wide range of practicality for quick judgment and troubleshooting.


 1.2 Hydraulic system schematic analysis


    According to the hydraulic system schematic diagram, analyze the faults in the hydraulic transmission system, find out the location and cause of the fault, and propose a method to eliminate the fault. The hydraulic system diagram analysis method is the most common method applied by engineers and technicians at present. It requires people to have a certain foundation for hydraulic knowledge and can understand the hydraulic system diagram. The name, function, principle and structure of the components represented by each graphic symbol are grasped. And the performance should also have a certain understanding, there is such a foundation, combined with the action cycle table to analyze and judge the fault is very easy. Therefore, it is the most powerful assistant for fault diagnosis and elimination to master the basic knowledge of hydraulics. It is also the basis of other fault analysis methods. Must be carefully mastered.


 1.3 Other analytical methods


    When the hydraulic system fails, it is often impossible to find out the location and root cause of the fault immediately. In order to avoid blindness, people must perform logic analysis according to the hydraulic system principle or use causal analysis to eliminate one by one, and finally find out the faulty part. It is to find out the fault by means of logic analysis. For ease of application, the fault diagnosis expert has designed a logic flow chart or other chart to logically judge the fault, which provides convenience for fault diagnosis.


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