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The mechanical equipment often malfunctions during hot weather include: motor drive trip, motor burned, contactor damaged, cable burned, and other electrical components short circuit burned; human-machine interface, programmable controller (PLC) of the automatic control system Faults and burns, computer systems, etc.
The main reasons for the failure are the following:
1. Electrical component aging and cable aging. Whenever the weather is hot, the temperature resistance of electrical components and cables decreases, and the insulation value changes rapidly, which may cause malfunction and burnout.
2. The equipment has been used for a long time, and the operation and vibration have caused poor contact between the power cord and the electrical components. The screws are not fastened properly. When the electrical heat is hot, due to the principle of thermal expansion and contraction, the contact is poor, and the terminals burn the components by fire. .
3. The equipment in use will surely have different levels of dust, but if the maintenance is not done well, it will not be cleaned in a long time, as if it is put on a thick coat, it will plug the heat dissipation holes of the components and the electronic components inside The heat cannot be dissipated, which seriously affects the heat dissipation of precision components and causes failure.
4. The equipment cooling environment is not ideal. Plants with low or near heating equipment are used to increase the temperature of the workshop. For example, the cardboard production line does not take cooling ventilation measures.
5. The device's cooling system is faulty, and the heat-dissipating components do not work. For example, the cooling fan of the electric cabinet and the dedicated heat-dissipating air conditioner of the electric cabinet do not work
6. Due to high temperature, the lubricating oil consumption of the transmission bearing during operation of the equipment will be relatively large. If the transmission bearing or other transmission parts do not have lubricating oil, mechanical failure will occur, causing bearing damage; if the corresponding transmission motor is not protected Perfection, then the motor will be burned because the mechanical load is too large.
According to the above common causes of failures, the following aspects of maintenance methods can be mainly adopted:
Strengthen the dust in the cleaning equipment at least once a week. Use air guns to blow the dust inside the equipment, especially in the cabinet, such as computer control cabinets, PLC field bus systems, frequency converters, etc.
Reducing the ambient temperature in the plant For the plant environment, fans can be added to enhance air circulation and reduce the ambient temperature in the plant as much as possible.
Pay attention to the maintenance and repair of the cooling system of the equipment itself. The cooling system must be restored to the factory's design requirements, especially the cooling fan in the cabinet, the heat-dissipating axial fan, and the air conditioner of the electric cabinet. If damaged, repair it in time. If the cooling system is not working properly, the heat of the electrical components of the device cannot be distributed, which will cause further damage to the precision components of the device.
Pay attention to the lubrication of the transmission parts. Periodically check the mechanical transmission parts carefully. Pay attention to the refueling and wear replacement of the bearings. Always check that the temperature of the power motor is within the normal range and do not cause the power system to cause further malfunction due to mechanical reasons.
Timely troubleshooting 1. Self-correction according to the device's technical data.
2. Consult the equipment supplier for troubleshooting.
3. If the problem cannot be solved under the guidance of the supplier, the equipment supplier shall be required to send technical personnel to assist in the solution.
Establish equipment maintenance mechanism 1. To strengthen the establishment and implementation of equipment maintenance system.
2. Save the equipment's technical data and record the historical maintenance records for future reference.
The summer and early autumn weather is the hottest season of the year, and it is easy to cause electrical equipment failures, especially in the carton plant, such as printing presses and cardboard production lines. Therefore, it is very necessary to master the maintenance of mechanical equipment under hot weather, especially fireproof units such as cardboard boxes.