How To Deal With The Overheating Of The Oil Press Motor
The abnormal increase in the temperature of the oil press motor is a common equipment failure, which requires special attention during the food processing process. If this problem cannot be solved in time, it may affect the oil output efficiency and even cause the equipment to be scrapped in advance. This article mainly discusses several common causes of heating during the use of the equipment, such as excessive load and unstable voltage. It also involves the maintenance of the cooling system that needs to be paid attention to in daily maintenance.
The main reasons for overheating of the oil press motor
There are mainly the following types of situations that cause motor overheating: First, the workload exceeds the design standard, that is, when the oil pressing volume exceeds the rated processing capacity of the equipment, the motor will be forced to increase the operating intensity. Especially when the machine runs continuously for more than ten hours without stopping, the internal coil temperature will continue to accumulate. For example, in order to catch up with the production schedule, some small workshops often put the equipment in an overloaded working state.
The second is the voltage fluctuation problem of the power supply system. In this case, for example, during the peak period of electricity consumption, the line voltage suddenly drops below 200 volts. At this time, in order to maintain the normal speed, the motor will automatically increase the current. Conversely, if the voltage suddenly rises to more than 240 volts, the coil heat will also double. We have previously encountered a situation where a processing plant experienced dozens of voltage fluctuations every day due to poor contact of the power distribution cabinet.
Another example is the aging and wear of the internal parts of the motor, which is a relatively hidden type of fault. When the bearing is stuck due to lack of oil, the resistance to the rotation of the rotor increases significantly, and obvious friction noise can be heard at this time. There is also a local short circuit caused by the damage of the winding insulation layer. This situation is more likely to occur in a humid environment. For example, the equipment failure rate will increase by 20% to 30% during the rainy season in the south.
The last thing to mention is the maintenance of the cooling system. Many users tend to ignore the dust cleaning of the cooling fan, especially when the processing workshop itself is dusty, the pores of the heat sink are easily blocked by oil. There was a case showing that a certain oil press workshop did not clean the motor cooling components for half a year, resulting in a drop in cooling efficiency of more than 60%.
How to check whether the oil press motor is overheated due to excessive load
Observe the running performance
For example, you can first see whether the motor is running steadily. If the speed slows down significantly, or you can hear a "buzzing" sound, or even feel a continuous vibration on the body, these phenomena may indicate that the motor is overloaded. At this time, you should pay special attention to whether the pulley is stuck.
Current value detection
You can use a pointer ammeter to measure the current intensity during operation. During the specific operation, you need to reliably connect the meter pen to the motor input end, and pay attention to the dial range to be adjusted to a position two gears higher than the rated current. If the actual current measured is more than 10% higher than the rated value in the manual, for example, a motor rated at 10A measures 12A, then it can be basically determined that there is an overload problem.
Load condition verification
That is, check whether the raw materials in the press chamber exceed the capacity limit, such as whether the rapeseed input exceeds the design standard of 80 kg per hour. Also, if the temperature setting and screw shaft speed during pressing are not adjusted correctly, such as the temperature is set too high, which increases the viscosity of the material, it will also make the motor work harder. In this case, you may need to replace the motor model with a more powerful one.
How to check whether the voltage is stable when the oil press motor is overheated
Voltage measurement method
For example, you need to choose a voltmeter with a suitable range. Now the commonly used one is a digital display model. When measuring, pay attention to the fact that the test pen must be firmly clamped on the terminal to avoid poor contact and random value jumps. It is recommended to measure five minutes after the motor is started, so that the data is more stable.
Data analysis points
The measured voltage value should be compared with the rated voltage. For example, if a 380-volt motor is measured to 420 volts, it will exceed the standard. Under normal circumstances, a fluctuation range of plus or minus 10% is allowed, that is, the range of 342-418 volts. If you find that the voltage is normal during the day but always low at night, it may indicate that there is an uneven load distribution problem in the entire power supply line.
Treatment and countermeasures
If it is confirmed that the voltage is unstable, the power supply company should be contacted to check the line, for example, to see if the transformer capacity is sufficient. The factory itself can consider installing an automatic voltage stabilizer, or adjusting the production period to avoid peak power consumption. For frequent voltage drops, it may also be necessary to equip the UPS uninterruptible power supply for protection.
Internal motor failure may cause the oil press motor to overheat. How to diagnose and deal with it
First, the problem of the coil winding should be checked, that is, it is necessary to use special instruments for detection, such as insulation resistance testers, which can measure whether the insulation layer of the winding is damaged or the line is interrupted. If an abnormality is detected, it may be necessary to decide whether to repair it locally or replace the entire winding depending on the degree of damage.
Next is the problem handling process of the bearing part. Specifically, you should first check whether the bearing has excessive wear or jamming. If the bearing has obvious damage, a new bearing must be replaced in this case; if it is just insufficient lubrication, such as insufficient butter lubrication, the parts should be disassembled for cleaning and re-applied with sufficient grease.
Finally, you also need to pay attention to the inspection of other internal parts, such as capacitors and brushes. Whether these components are working properly. When a component is found to have a problem, it may be necessary to replace the damaged parts separately, or send it directly to the factory for overall inspection. It should be noted here that if you encounter a complex circuit problem, you may have to find a professional master to handle it to ensure safety.
How to improve the heat dissipation conditions of the oil press motor to prevent overheating
Cleaning and maintenance of the heat dissipation system
The first step is to clean and maintain the heat dissipation device, that is, regularly remove the dust and dirt accumulated in the gaps between the heat dissipation fan blades and the heat sink. For example, when oil debris or cotton wool blocks the heat dissipation channel, it must be cleaned in time to ensure the smooth flow of air. It should be noted that if the heat dissipation fan is found to have abnormal speed or abnormal sound, it is necessary to replace the new fan components at this time.
Improvement plan for heat dissipation structure
At the equipment design level, it is possible to consider enhancing the heat dissipation capacity, such as increasing the number of heat sinks or expanding the surface area, so that the heat can be dissipated into the air faster. In addition, it is also an effective means to modify the ventilation duct, such as adding a guide plate at the air inlet position, or changing the arrangement of the heat sink to a wavy structure, so that the air flow can be smoother and help take away the heat faster.
Configuration of additional heat dissipation devices
For some special use scenarios, it may be necessary to install additional heat dissipation equipment. For example, an industrial-grade exhaust fan can be installed on the side of the motor, or a circulating water cooling pipe system can be configured for key parts. In high-temperature workshops or equipment that runs for a long time, this auxiliary heat dissipation method can reduce the motor temperature by 10-15℃, significantly improving the stability of equipment operation. According to our actual test data, the combination of adding heat sinks and ventilation modification has the most obvious effect.
Conclusion
Overheating of the oil press motor is one of the important factors affecting the normal operation of the equipment. By systematically analyzing the cause of overheating, scientifically inspecting and diagnosing faults, taking targeted treatment measures, and continuously optimizing heat dissipation conditions, the risk of motor overheating can be effectively reduced, and the operating efficiency and life of the equipment can be improved. In actual applications, it is recommended to regularly maintain the oil press to promptly discover and solve potential problems and ensure long-term stable operation of the equipment.
