Basic repair method of injection molding machine

Update:09-01-2021
Summary:

The core of the repair work of the injection molding ma […]

The core of the repair work of the injection molding machine is the judgment of the fault and the treatment of the fault. It involves a wide range of knowledge, a large degree of complexity, and a certain depth (such as comprehensive professional knowledge level). You must have basic knowledge of mechanical equipment maintenance, basic knowledge of hydraulic maintenance, and basic knowledge of electrical maintenance. In fact, the maintenance of injection molding machine is difficult, but it is a process of continuous learning and progress. As long as you master the basic working principle of injection molding machine and master the basic working methods, regardless of various models, you can explore a set of maintenance. The working procedures come to ensure the normal operation of the injection molding machine.Maintenance workers must first understand and master the contents of the operating instructions of the injection molding machine, be familiar with and master the mechanical parts, circuits and oil circuits of the injection molding machine, understand the working process of the mechanics, circuits and oil circuits of the injection molding machine during normal operation, and understand and Master the inspection and maintenance methods of electrical components and hydraulic components. Know the normal working state and the abnormal working state to avoid time-consuming misjudgment and wrong disassembly.

Maintenance work must understand the operation method of the equipment and some basic knowledge of injection molding, and be able to use the injection molding machine correctly. If you do not know how to operate the injection molding machine, the maintenance work is very difficult, and the fault judgment may be unreliable. The circuit boards and electrical components in the injection molding machine are affected by factors such as high temperature, environment, time, etc., the operating point of the components is shifted, and the aging degree of the components is within the normal range. Therefore, debugging an injection molding machine is also one of the essential basic skills in maintenance work. Understanding the working procedures of the injection molding machine, debugging the electronic circuit and hydraulic circuit of the injection molding machine are very important links.

The maintenance work must be accurate, reliable and timely. It is necessary to study and master the contents of the instruction manual of each type of injection molding machine. In the general maintenance process, the maintenance idea is usually the circuit-the oil circuit-the action of the mechanical parts. The adjustment work is carried out in reverse. If the mechanical action and the clamping pressure are insufficient, you can find the oil circuit and the circuit. If the circuit output is normal, adjust the oil circuit valve. If the oil circuit works normally, adjust the circuit electronic board. Of course the final coordination, but the relationship between the three is interdependent and mutual control. Correct use of instruments and meters, adjustment of detection circuits, inspection and repair of oil circuits, and adjustment of the position and action of mechanical parts are important means of judging failures. Generally, injection molding machine manufacturers only provide the electrical block diagram of the equipment, the block diagram of the oil circuit and the main parts of the machinery, which is not enough for maintenance work. Attention must be paid to collecting and sorting out all relevant information in daily maintenance work. Such as electrical, electronic, mechanical spare parts, oil circuit, solenoid valve body, etc. For example, if there is an opportunity in the electrical field, it is necessary to survey and map the schematic diagram of the circuit, the schematic diagram of the electronic board and the actual wiring diagram, and measure the corresponding components of the wiring terminal, so as to provide accurate fault judgment and analysis during maintenance. Where to check point. Measure the specific parameters of its detection point. When necessary, you should also make your own power supply, simulate input and output signals, and conduct simulation tests or adjustments to master and obtain first-hand maintenance data, such as parameters at various levels of work points.

The same is true for oil circuit maintenance, which must be adjusted and maintained according to the characteristics of the oil circuit and the oil pressure solenoid valve. Have the opportunity to frequently disassemble, clean, inspect, and install solenoid valves. These treatments will cause a lot of trouble, but they are crucial.

The maintenance work must be mastered and sorted out in accordance with the principle and logic system failure maintenance methods and judgment program diagrams, combined with the actual maintenance work on weekdays, collect relevant information of the injection molding machine, such as troubleshooting, the methods include step-by-step inspection method, simulation inspection method, Various methods such as voltage test method, continuity test method, circuit board substitution method, etc. After repairing, it is necessary to re-adjust the working point, re-adjust and carry out a load test to make the equipment work within the parameter range of the data listed in the operation manual.

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