Injection molding machine is a commonly used mechanical equipment in the plastic machinery industry. It is the main molding equipment for making thermoplastic or thermosetting plastics into plastic products of various shapes using plastic molding molds. It is divided into vertical, horizontal and all-electric. The injection molding machine heats the plastic and applies high pressure to the molten plastic, causing it to shoot out and fill the mold cavity.

Maintenance workers must first understand and master the contents of the operation manual of the plastic mechanical injection molding machine, familiar with and master the mechanical parts, circuits and oil lines of the injection molding machine, understand the working process of the machinery, circuits and oil lines of the injection molding machine in normal work, understand and master the inspection and maintenance methods of electrical components and hydraulic components. Clear normal working state and abnormal working state, in order to avoid time-consuming misjudgment and misdisassembly.

Maintenance work must understand the operation method of the equipment and have some basic knowledge of injection molding, and will use the injection molding machine correctly. If you do not know the operation of the injection molding machine, the maintenance work is very difficult, and the fault may not be reliable. The circuit board and electrical components in the injection molding machine are affected by high temperature, environment, time and other factors for a long time, the operating point offset of the device, the aging degree of the components, all belong to the normal range. Therefore, debugging injection molding machine is also one of the essential basic skills in maintenance work. It is very important to understand the working procedure of the injection molding machine and debug the electronic circuit and hydraulic oil circuit of the injection molding machine.

Maintenance work to 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, oil circuit and mechanical parts action. And the adjustment work is carried out in turn, such as mechanical action and clamping pressure, can go to find the oil circuit and circuit, such as the circuit output is normal, then adjust the oil valve. If the oil circuit works normally, adjust the electronic board of the circuit. Of course, the final adjustment, but the relationship between the three interdependent, mutual control. The correct use of instruments, adjust the detection circuit, overhaul the oil circuit, debug the position and action of the mechanical part, is an important means to judge the fault.

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 machinery, which is not enough for the maintenance work. Must pay attention to the daily maintenance work, collect, collate all aspects of the relevant information. Such as electrical, electronic, mechanical spare parts, oil circuit, electromagnetic valve body and other aspects of information. For example, if there is an opportunity in electrical aspects, it is necessary to map the circuit schematic diagram, map the schematic diagram of the electronic board and the actual wiring diagram, measure the device corresponding to the terminal and other relevant information, so as to provide accurate detection point whereabouts for fault judgment and analysis in maintenance.

Measure the specific parameters of the detection point. When necessary, but also to make their own power supply, analog input and output signals, simulation test or adjustment, in order to master and obtain first-hand maintenance data, such as all levels of work point oil circuit maintenance is also the same, must be based on the characteristics of the oil circuit and oil pressure solenoid valve comprehensive adjustment and maintenance.

Organic will often disassemble, clean, check, install the solenoid valve. These treatments can cause a lot of trouble, but they are vital. Maintenance work must master and sort out in line with the principle, logical system fault maintenance methods and judgment program diagram, in combination with the actual maintenance work on weekdays, collect the relevant information of injection molding machine, such as fault processing, the method has a step-by-step inspection method, simulation inspection method, voltage test method, on-off test method, circuit board replacement method and other methods. After repair, it is necessary to readjust the working point, adjust it again, and carry out a load test, so that the equipment works within the parameter range of the data listed in the operating manual.

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