1. Electric wrench mainly adopts two-stage planetary gear mechanism.

　　电机旋转驱动高速行星齿轮机构的太阳轮，齿环与壳体固定连接，通过拉杆将扭矩传递给低速行星齿轮机构的太阳轮。低速行星齿轮机构的齿轮环与传感器连接，通过传感器固定在壳体上。同时，扭矩从拉杆传递到扳手头，扳手头用于拧紧螺栓。为了控制力矩扳手的扭矩，必须测量扳手头的扭矩。

　　The motor rotates to drive the solar wheel of the high-speed planetary gear mechanism. The gear ring is fixed to the shell, and the torque is transmitted to the solar wheel of the low-speed planetary gear mechanism through the tie rod. The gear ring of the low-speed planetary gear mechanism is connected with the sensor and fixed on the shell by the sensor. At the same time, the torque is transferred from the tie rod to the wrench head, which is used to tighten the bolt. In order to control the torque of the torque wrench, it is necessary to measure the torque of the wrench head.

　　电动扭矩扳手

　　Electric Torque Spanner

　　2. 由于扳手头是旋转的，不能直接将应变片固定在扳手头上，否则会缠绕在扳手头周围，导致断线。采用集电环装置，扳手尺寸增大，成本高，测量精度低。为此，我们利用行星齿轮机构的动态并联特性，将传感器弹性体的一端与齿轮环低速啮合，另一端与壳体用销固定连接。弹性体上附加了一个应变计，使它能感觉到齿轮环的扭矩。因此，只要确定低速级行星齿轮机构中齿轮环(传感器)与拉杆之间的扭矩关系，就可以通过监测齿轮环的扭矩，间接测量扳手头的扭矩。

　　2. Because the wrench head is rotating, strain gauge can not be fixed directly on the wrench head, otherwise it will be wound around the wrench head, resulting in wire breakage. With collector ring device, the size of wrench increases, the cost is high and the measurement accuracy is low. For this reason, we use the dynamic parallel characteristic of planetary gear mechanism to engage one end of the sensor elastomer with the gear ring at low speed and the other end with the pin fixed connection of the shell. A strain gauge is attached to the elastomer to enable it to sense the torque of the gear ring. Therefore, as long as the torque relationship between the gear ring (sensor) and the tie rod in the low-speed planetary gear mechanism is determined, the torque of the wrench can be indirectly measured by monitoring the torque of the gear ring.

　　电动扭矩扳手

　　Electric Torque Spanner

　　由于采用行星齿轮机构，电动扳手传动功率大，扭矩输出稳定，冲击小，易于实现对扭矩和速度的控制，因此电动扳手的应用越来越广泛。

　　Because of the planetary gear mechanism, the electric wrench has the advantages of high transmission power, stable torque output, small impact and easy to realize the control of torque and speed, so the application of electric wrench is more and more widely.

　　3.电动扳手扭矩分析如上所述,电动扳手是通过低速扭矩减少系杆的行星齿轮机构的输出,与扭矩传感器齿圈,因此,实现控制的扭矩扳手,必须找到系杆的转矩齿圈和星齿轮机构之间的关系了电力传输扳手和旋转轴扭矩测量问题。原理新颖，装置可靠。

　　3. Torque analysis of electric wrench as mentioned above, electric wrench reduces the output of planetary gear mechanism of tie rod through low-speed torque, and the gear ring of torque sensor. Therefore, in order to realize the control of torque wrench, it is necessary to find the relationship between the torque ring of tie rod and star gear mechanism to solve the problem of torque measurement of power transmission wrench and rotating shaft. The principle is novel and the device is reliable.

　　由行星齿轮机构驱动的电动扳手具有比气动扳手更大的拧紧力矩和更小的冲击。

　　The electric wrench driven by planetary gear mechanism has larger tightening moment and smaller impact than the pneumatic wrench.

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