Repair of plastic molding machine

1. The maintenance personnel must understand the operation method of the equipment and have some basic knowledge of injection molding, and be able to use the plastic molding machine correctly. If you don’t know how to operate a plastic molding machine, the maintenance work is very difficult, and the fault judgment may be unreliable.
The circuit boards and electrical components in the plastic molding machine are affected by high temperature, environment, time and other factors for a long time, the operating point of the components is shifted, and the aging degree of the components is within the normal range. Therefore, debugging a plastic molding machine is also one of the essential basic skills in maintenance work.

2. Understanding the working procedures of the plastic molding machine, debugging the electronic circuit and hydraulic circuit of the plastic molding machine are very important links. The maintenance work must be accurate, reliable and timely, and the contents in the operating instructions of various types of plastic molding machines must be studied and mastered. In the general maintenance process, the maintenance idea is usually the action of the circuit, the oil circuit and the mechanical parts. The adjustment work is carried out in reverse, such as mechanical action and clamping pressure, etc., you can find the oil circuit and 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 actions of mechanical parts are important means of judging failures.

3. Generally, plastic 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, in electrical, if there is an opportunity, 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 and other related materials, so as to provide accurate fault judgment and analysis during maintenance. Where the detection point goes. Measure the specific parameters of its detection point. When necessary, you must also make your own power supply, simulate input and output signals, and perform simulation tests or adjustments to master and obtain first-hand maintenance data. For example, the same is true for oil circuit maintenance at all levels of work points, which must be based on the oil circuit. And the characteristics of the hydraulic solenoid valve are comprehensively adjusted and maintained. Have the opportunity to disassemble, clean, inspect and install solenoid valves.

4. 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 the relevant information of the plastic molding machine, such as troubleshooting, the methods include step-by-step inspection and simulation Various methods such as inspection method, voltage test method, continuity test method, circuit board substitution method, etc. After repairing, it is necessary to re-adjust the operating 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.