Profile: Chongqing Yunda Technology Co., Ltd. specializes in providing professional equipment such as the welding generator, engine driven welding machine, mechanical wrench, and internal combustion arc welding work station. Our mechanical torque wrench is suitable for existing rail lines, and the loosening, unloading, and tightening operations of rail sleeper blots laid on various types of bolts. The sleeve can drop off automatically, eliminate inclination of the sleeper nut, errors of the central moment, and super elevation tilt error in the curve operation automatically, and accurately insert bolts and nuts. When the sleeve and the bolt/nut are blocked on the track, it can separate the sleeve and the host machine rapidly, and fully eliminate potential safety hazards, because the sleeve and the nut are blocked while maintaining the line and repairing transfinite operations.