The screw pump needs to be overloaded during oil production. The overload of the screw pump will cause the oil well to break the rod, break the belt, damage the gears and bearings in the reduction box, and even burn out the motor. There are two commonly used overload protection methods: torque method and current method. 1. Screw pump torque method overload protection pin type: connect the pulley on the input shaft of the reducer and the shaft sleeve with a shear pin, and the shaft sleeve and the shaft are connected with a key.

According to the load torque of the screw pump, pins with different load capacity are selected. When the load torque exceeds the bearing capacity of the pin, the pin is sheared, causing the pulley to run idly, realizing overload protection. Although the pin-type overload protection is simple and easy to implement, it is inconvenient to use because of the poor adjustability of the overload torque. Spring type:

The input shaft of the gearbox and the pulley are connected with a spring ball torque coupling. The load torque of the coupling can be adjusted by adjusting the expansion and contraction of the spring. When the load torque exceeds the load torque of the coupling, the ball on the coupling will be separated

The Borewell Pumps Manufacturers disengages the belt pulley from the input shaft. At the same time, the limit switch installed near the connector operates to control the motor to stop and realize overload protection. 2. Screw pump current method overload protection The working current of the drive motor directly reflects the size of the working load, so the overload protection current can be set in the electrical control system. When the working current exceeds the set overload protection current, the drive motor stops working. Realize overload protection. The magnitude of the overload protection current varies with the pump type, drive motor and working speed. Current method overload protection is a commonly used method at present.

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