Design of Electric Fixed Torque Wrench Based on Speed Difference Detection

In modern industry, torque wrenches are widely used in precision assembly. In view of the shortcomings of the existing electric torque wrenches on the market, such as complex scheme, low precision and small torque range, this paper proposes a design scheme of torque wrenches based on the detection of torque difference to control the bolt preload. At the same time, the mechanical characteristics of the series motor used in the torque wrench are analyzed, and the mathematical model between torque and speed difference is established. The electric fixed torque wrench has the characteristics of simple structure, large torque range, safety and reliability.