Preventive maintenance and repair work on injection mouding machines - electrical components

1. Wire joints Checking the wires of the joints that are not fastened may cause high temperature or sparking damage to the joints. The joints may also affect the transmission of signals; the joints on the contactors may be vibrated by electromagnetic action. It is easier to loosen, so it is necessary to check the position of the wire connector and tighten it regularly.

2. Motors Generally, motors are air-cooled. Dust accumulation makes it difficult to dissipate heat. Therefore, it is regularly cleaned every year. Usually, the motor overload breaker is installed in the circuit. The limit current of the protection device is adjustable. The power is properly selected, and once the overload protector is activated, it should be determined whether the inverter is out of phase, the contact is bad, or the oil temperature is too high before pressing the return switch.

3. The heating tube and the thermocouple heating tube should be checked for fastening to ensure effective heat transfer. In normal production, the burning of the heating tube is not easy to detect. To this end, pay attention to the working condition of the temperature controller and judge the heat from it. Whether the tube is normal. In addition, the common damage of the heating tube is the wire connection. Due to the poor connection, the contact resistance increases, causing the interface to be overheated and the interface is oxidized and damaged.

4. The contactor of the electromagnetic contactor used in the electric heating part has a faster loss rate because of the frequent movement. If the main contact is overheated and melted and bonded, the heating temperature may be out of control, so if the contact is found to be overheated, it may sound or If the fire is very large at the time of breaking, it means that it is about to be damaged and should be replaced as soon as possible.

5. Computer control part With the application of microcomputer control technology on the injection molding machine, the normal operation of the microcomputer part and its related auxiliary electronic board to the fluctuation of the power supply voltage, the temperature and humidity of the working environment, the shock resistance of the installation and the external high frequency Signal interference has put forward higher requirements. For this reason, the fan for ventilation and heat dissipation in the control box is kept working normally, and the power supply with high precision is used to supply power. Try to reduce the influence of the external vibration of the control box. Aspects of the problem and regular inspection.