Research Of Pneumatic Digital Torque Wrench

Air wrench has been applied extensively because of its advantages of fast working speedand high efficiency in the process of manufacturing and maintenance of machinery. In recentyears, with the development of science and technology, the accuracy requirement of screwthread pair connection in mechanical equipment is increasing continually. So it leads toimmediate demand of high torque output device. Therefore, pneumatic digital display torquewrench, as a typical high precision torque output device, has good market prospects.Firstly, in order to adapt to the requirement of good market prospects, the relatedtechnologies were studied in this paper. We present the mechanical structure of the pneumaticdigital display torque wrench. Then we develop a kind of mechanical structure design schemewith vice pneumatic motor to measure dynamic torque and static torque simultaneously. Itsgood versatility make it has wide usage scope.Furthermore, magneto-electric torque sensor is analyzed and researched as the measuringmodule of the pneumatic digital display torque wrench. We establish the sensor model tosimulate and analyze the concrete working process based on Ansoft Maxwell electromagneticfield analysis software, and then put forward a kind of sensor with eight pieces of tile typepermanent magnet structure design scheme, which has the characteristics of non-instantaneoushigh voltage output of induction electromotive force.Finally, the pneumatic digital display torque measuring device of torque wrench wasdesigned to process, analyze and compute the induced electromotive force of magneto-electricsensor output based on Microcontroller Unit (MCU), and the torque and speed value weredisplayed on the LCD. The simulation results show that the torque measuring instrument hasthe simple and practical characteristics.