The electric wrench adopts a two-stage planetary gear mechanism. The motor rotates to drive the sun gear of the high-speed planetary gear mechanism, while the ring gear is fixedly connected with the shell, and the torque is transmitted from the tie rod to the sun gear of the low-speed planetary gear mechanism. The ring gear of the low-speed planetary gear mechanism is connected with the sensor and fixed on the housing through the sensor. At the same time, the torque is transmitted from the tie rod to the wrench head, and the wrench head can tighten the bolts. In order to control the torque of the torque wrench, it is necessary to measure the torque of the wrench head.
Since the wrench head is rotating, the strain gauge cannot be directly pasted on it, otherwise the wire will be wound on the wrench head and broken. If the collector ring device is adopted, the wrench will have large volume, high cost and low measurement accuracy. Therefore, we use the power split characteristics of the planetary gear mechanism to mesh one end of the sensor elastomer with the low-speed gear ring through the gear, and the other end is fixedly connected with the shell with a pin. A strain gauge is pasted on the elastomer to make it feel the torque of the gear ring. In this way, as long as the torque relationship between the ring gear (sensor) and the tie rod in the low-speed planetary gear mechanism is determined, the torque of the wrench head can be measured indirectly by monitoring the torque of the ring gear.
Due to the use of planetary gear mechanism, the electric wrench has high transmission power, stable torque output and small impact, and it is easy to control torque and speed. Therefore, the application of electric wrench is more and more widely.
The torque analysis of the electric wrench is as mentioned above. The torque of the electric wrench is output through the tie rod of the low-speed planetary gear mechanism, while the sensor measures the torque of the ring gear. Therefore, in order to control the torque of the wrench, it is necessary to find out the torque relationship between the tie rod and the ring gear. The star gear mechanism solves the problems of power transmission of the electric wrench and the measurement of the torque of the rotating shaft. Novel principle and reliable device.
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