Injection molding machines are commonly used in the plastic machinery industry. It is the main molding equipment for thermoplastic or thermosetting plastics using plastic molding dies to make plastic products of various shapes. Divided into vertical, horizontal, all-electric. The injection molding machine heats the plastic and applies a high pressure to the molten plastic to eject it to fill the mold cavity.
The maintenance worker must first understand and master the contents of the operation manual of the plastic mechanical injection molding machine, familiarize with and master the mechanical parts, circuits and oil paths of the injection molding machine, and understand the working process of the mechanical, electrical and oil circuits of the injection molding machine during normal operation. Understand and master the inspection and maintenance of electrical components and hydraulic components. Clear normal working conditions and abnormal working conditions to avoid time-consuming misjudgment and mis-disassembly.
Maintenance work must be aware of the operation of the equipment and the basic knowledge of injection molding, and the correct use of the injection molding machine. If you don't know how to operate the injection molding machine, it is very difficult to repair the work. It may also be unreliable to judge the fault. In the injection molding machine, the circuit board and electrical components are affected by high temperature, environment, time and other factors for a long time. The working point of the device is offset and the aging degree of components is within the normal range. Therefore, debugging the injection molding machine is also one of the essential skills in the maintenance work.
Knowing the working procedures of the injection molding machine, debugging the electronic circuit of the injection molding machine and the hydraulic oil circuit are very important links.
The maintenance work must be accurate, reliable and timely. The contents of the instruction manual of each type of injection molding machine must be studied and mastered. In the general maintenance process, the maintenance ideas are usually the circuit, oil circuit and mechanical parts. The adjustment work is reversed, such as mechanical action and clamping pressure, etc., can go to the oil circuit and circuit, if the circuit output is normal, then adjust the oil valve. If the oil circuit works normally, adjust the circuit board. Of course, the final adjustment, but the three are interdependent and mutually control.
Proper use of instrumentation, adjustment of detection circuits, maintenance of oil circuits, debugging of the position and movement of mechanical parts is an important means of determining faults.
General injection molding machine manufacturers only give the electrical block diagram of the equipment, the block diagram of the oil circuit and the main part of the machine, which is not enough for maintenance work. Attention must be paid to the collection and collation of relevant information in daily maintenance work. Such as electrical, electronic, mechanical spare parts, oil circuits, electromagnetic valve body and other aspects of information.
For example, if there is an opportunity in the electrical aspect, it is necessary to map the schematic circuit diagram, the schematic diagram of the electronic board and the actual wiring diagram, and measure the relevant equipment of the terminal, so as to provide accurate judgment and analysis for the fault during maintenance. The detection point goes.
The specific parameters of the detection point are measured. When necessary, you must also make your own power supply, simulate input and output signals, perform simulation tests or adjustments, and master and obtain first-hand maintenance data. For example, oil level maintenance at all levels of work points must be based on oil circuits. And the characteristics of the hydraulic solenoid valve are comprehensively adjusted and repaired.
There are opportunities to disassemble, clean, inspect, and install solenoid valves. These treatments can cause a lot of trouble, but they are crucial.
Maintenance work must master and sort out the principle of conformity, conform to the logic system fault repair method and judgment program diagram, and collect the relevant information of the injection molding machine in combination with the actual work of the daily maintenance work, such as fault handling, the method has step-by-step inspection method, simulation inspection method, Various methods such as voltage test method, continuity test method, and circuit board replacement method.
After repairing, it is necessary to re-adjust the working point, re-adjust the test, carry out the load test, and make the equipment work within the parameters of the data listed in the operating instructions.
