Fault diagnosis method of hydraulic press

In order to effectively analyze and maintain the failure of the hydraulic press, we must first understand the working principle of the hydraulic press, so that when the hydraulic press fails, we can quickly and effectively judge the failure of the hydraulic press! The following is a detailed description of the working principle and structure of the hydraulic press by Jianlong Oil Press Co., LTD. :

Hydraulic press is composed of mechanical, hydraulic, electrical and other devices, so the failure is also a variety of. A certain fault phenomenon may be caused by many factors, so the analysis of hydraulic system failure must be able to understand the schematic diagram of the hydraulic system, have a general understanding of the role of each component in the schematic diagram, and then analyze and judge according to the fault phenomenon, and analyze the causes of failure caused by many factors one by one, seize the main contradiction, In order to better solve and eliminate. The flow of hydraulic components and pipelines in the hydraulic system of the hydraulic press is difficult to be understood by the outside world, so it brings more difficulties to the analysis and diagnosis, so technicians are required to have a strong ability to analyze and judge faults. In the mechanical, hydraulic, electrical many complex relationships to find the cause of failure and parts and timely, accurate to eliminate.

A. Simple fault diagnosis method:

Simple fault diagnosis method is the most common method used at present, it is based on the personal experience of maintenance personnel, the use of simple instruments according to the failure of hydraulic mechanical system, objective use of asking, looking, listening, touching, smelling and other methods to understand the work of the system, analysis, diagnosis, determine the cause and location of the fault, the specific practice is as follows:

(1) Ask the equipment operator to understand the operation status of the equipment. Among them: whether the hydraulic mechanical system of the hydraulic press works normally; Hydraulic pump has no abnormal phenomenon; Hydraulic oil test cleanliness time and results; Filter element cleaning and replacement; Whether the hydraulic components were adjusted before the failure occurred; Whether the sealing element has been replaced; What abnormal phenomena have occurred in the hydraulic press system before and after the failure; What failures have occurred in the system in the past and how to eliminate them need to be understood one by one.

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

(3) Listen to the sound of the hydraulic press system, such as: impact sound; Pump noise and abnormal sound; Determine whether the hydraulic mechanical system is working normally.

(4) Touch the oil temperature, listen to the vibration, see the crawling and tightness of the joint to determine whether the working state of the moving parts is normal.

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

B. Hydraulic press system schematic analysis:

According to the principle diagram of hydraulic press system, the fault of hydraulic transmission system is analyzed, the fault location and reason are found out, and the method of troubleshooting is put forward. Hydraulic press system diagram analysis method is the most common method used by engineers and technicians at present, which requires technical personnel to have a certain foundation of hydraulic knowledge and understand the hydraulic mechanical system diagram, understand the name and function of the components represented by the graphic symbols, and have a certain understanding of the principle, structure and performance of the components. With such a foundation, it is easy to analyze and judge the fault in combination with the action cycle table. Therefore, carefully learning the basic knowledge of hydraulic and mastering the hydraulic schematic is the most powerful assistant for fault diagnosis and elimination, and it is also the basis of other fault analysis methods. Must be mastered carefully.