Electric torque wrench manufacturers believe that the design of torque sensors is crucial for the performance of electric wrenches. When the wrench head rotates, the strain gauge cannot be directly connected to the wrench head, otherwise the wire will wrap around the wrench head and roll off. If other shaft torque sensors are used, the wrench has a large volume, high cost, and low accuracy. Therefore, utilizing the characteristics of planetary gear structure, one end of the sensor elastomer is engaged with the low-speed gear ring through the gear teeth, and the other end is fixedly connected to the housing through a pin. Then, attach a strain gauge to the elastomer and feel the torque of the gear ring, converting the torque measurement of the rotating shaft into the torque measurement of the fixed shaft.

电动扭剪扳手厂家认为电动扳手主要由微电脑控制系统、步进电机、两级行星齿轮机构、外壳、扭矩传感器、扳手头等组成。步进电机转动时，带动高速行星齿轮机构的轮转动，该机构的另一个轮(齿圈)与壳体固定连接；扭矩通过拉杆传递给低速行星齿轮机构的轮，机构的另一个轮(齿圈)与传感器连接，并通过传感器固定在壳体上；同时，扭矩通过拉杆传递到扳手头，拧紧螺栓。当低速行星齿轮机构的齿圈(传感器)与拉杆之间的扭矩关系确定后，通过监测传感器的扭矩值就可以间接测得扳手头的扭矩。微电脑控制系统采集传感器的扭矩信号，经过处理后反馈给步进电机，从而控制扳手的扭矩和速度。

Electric torque wrench manufacturers believe that electric wrenches are mainly composed of microcomputer control systems, stepper motors, two-stage planetary gear mechanisms, casings, torque sensors, wrench heads, etc. When the stepper motor rotates, it drives the center wheel of the high-speed planetary gear mechanism to rotate, and the other center wheel (gear ring) of the mechanism is fixedly connected to the housing; The torque is transmitted to the center wheel of the low-speed planetary gear mechanism through a pull rod, and the other center wheel (gear ring) of the mechanism is connected to the sensor and fixed on the housing through the sensor; At the same time, torque is transmitted to the wrench head through the pull rod to tighten the bolts. After the torque relationship between the gear ring (sensor) and the pull rod of the low-speed planetary gear mechanism is determined, the torque of the wrench head can be indirectly measured by monitoring the torque value of the sensor. The microcomputer control system collects torque signals from sensors, which are processed and fed back to the stepper motor to control the torque and speed of the wrench.

电动扭剪扳手厂家认为电动扳手采用步进电机和行星齿轮机构，了动力传递和扭矩的动态检测与控制问题。原理新颖，装置可靠。扭矩传感器静态标定结果表明，传感器输出稳定，测量范围内灵敏度高，线性误差和弹性滞后小，满足设计精度要求。

The manufacturer of electric torque wrench believes that the electric wrench uses a stepper motor and planetary gear mechanism to solve the dynamic detection and control problems of power transmission and torque. The principle is novel and the device is reliable. The static calibration results of the torque sensor indicate that the sensor has stable output, high sensitivity within the measurement range, small linear error and elastic hysteresis, and meets the design accuracy requirements.

电动扭剪扳手厂家认为在螺栓装配中，为了保证螺栓连接的可靠性和疲劳强度，须适当控制螺栓连接的预紧力，这在很大程度上取决于扳手拧紧力矩的控制。电动扭矩扳手采用步进电机和行星齿轮驱动，克服了传统气动扳手转速高、冲击力大、扭矩不稳定的缺点，能够准确监测螺栓的拧紧扭矩。已成为钢结构等工程中不可缺少的电动工具之一。

Electric torque wrench manufacturers believe that in bolt assembly, in order to ensure the reliability and fatigue strength of bolt connections, it is necessary to appropriately control the pre tightening force of bolt connections, which largely depends on the control of the wrench tightening torque. The electric torque wrench is driven by a stepper motor and planetary gears, overcoming the shortcomings of traditional pneumatic wrenches such as high speed, high impact force, and unstable torque. It can accurately monitor the tightening torque of bolts. It has become one of the indispensable electric tools in steel structure and other engineering projects.

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