What is the working principle of the protection device for the reduction oil tank with excessive temperature?

RS57-10 The working principle of the oil tank overtemperature protection device of the reducer is to monitor the oil tank temperature in real time through a temperature sensor and compare it with the set temperature threshold. When the temperature exceeds the threshold, the corresponding protection action is triggered to prevent the reducer from being damaged by overheating. The details are as follows:

• Temperature monitoring : The core component of the protection device is a temperature sensor, and common ones include thermistors, thermocouples, etc. These sensors are installed in or near the oil tank of the reducer, and can sense the temperature changes of the lubricant in real time and convert the temperature signal into an electrical signal.

• Signal comparison and processing : The electrical signal output by the temperature sensor will be transmitted to the control unit, and a comparator is provided in the control unit to compare the received temperature electrical signal with the preset temperature threshold. When the temperature electrical signal exceeds the set temperature threshold, the comparator will trigger subsequent protection actions.

• Protection action execution :

• Cut off the power supply : If the protection device has the function of cutting off the power supply, when the temperature exceeds the threshold, the control unit will send a signal to trigger the circuit protector action, such as an electromagnetic relay or fuse to cut off the power supply of the reducer, causing the reducer to stop running, thereby avoiding damage to internal components due to overheating.

• Start the cooling system : Some protection devices will be linked to the cooling system. When the temperature sensor detects that the lubricant oil temperature is greater than the set value, the control unit will control cooling equipment such as the motor pump and air cooler to circulate and cool the lubricant in the oil tank. For example, the motor pump extracts high-temperature lubricating oil in the housing and sends it into the air cooler or oil-water heat exchanger. The heat in the lubricating oil is taken away through the air or water, and the cooled lubricating oil flows back to the reducer housing to cool down the reducer.

• Issue an alarm signal : Some protection devices will also be equipped with alarm devices, such as alarm lights or buzzers. When the temperature exceeds the set value, the output device will issue an acoustic and optical alarm, reminding the operator to take timely measures, such as checking the working status of the reducer, checking the reasons for excessive temperature, etc.