Spline shaft hoist Fracture Analysis and Improvement II, an improved method to solve the problem of off-axis spline shaft, the use of units taken different improvement measures, such as the spline coupling sleeve into a tire coupling or claw type elastic couplings. In the heat treatment process will splined portion extends over the ending portion of the heat treatment, have received good results. Figure 2 shows the structure of our plant improved. We mainly the spline shaft at both ends of spline portion into a flat key, and the shaft diameter and the other dimensions are unchanged. While the radius of the circle key shaft axis at the transition instead R1.5, especially to ensure in the process. At the left end of the motor shaft at the shaft from the past instead of the gear coupling spline bushing. Thus, when the motor is mounted facilitate the operation more convenient. And in operation, two axes of a different mind can get some self-adjusting compensation. However, the outer diameter of the inner-tooth gear coupling sleeve smaller diameter roller bearing bore dry inside. Right installation friction plate spline bushing, only the corresponding bore spline coupling into a single bond, external dimensions and structural change. After the improvement, more than two years there has been no use of an off-axis phenomenon occurred. In short, for the type of electric hoist the original structure of the weaknesses in ensuring the transfer torque and in the original structure dimensions allow, according to the processing characteristics of the unit, according to local conditions using different techniques to improve measures to address the broken shaft problem, electric wire rope hoist manufacturers to ensure the normal use of electric hoist. Excessive hoist gearbox fall revelation of the accident investigation found that the wire rope hoist gearbox fall accidents have occurred, wire rope hoists, depending on the cause of the accident, was from the state of insecurity and human unsafe behavior analysis, Shanghai Electric wire rope hoists, in order to prevent similar incidents, wholesale electric wire rope hoist, the following main points to be improved and prevention. 1) guide rope and lifting height limiter (stock) is a very important electric hoist safety device, in use, make sure the role of reliable and effective safety devices, safety devices if found damage or failure should immediately stop work until the recovery device to a safe state. 2) to improve the design, eliminate safety hazards from the source device, so that the rope can not be separated into the gaps around the reel so that the reel and the gearbox process, such as an increase in the roll ends of the rope means stop or decrease the volume of the housing clearance and other tube ends. The main reason hoist gearbox fall accident is due to gap extrusion rope gear box will cause the gear unit housing studs bearing fracture table outside: hoisting hook deform the housing, it can lead to gear box bearing stud table fracture, therefore, should improve the tensile strength of the housing slowdown, as will the material replacement position steel, increased fillet, increasing the wall thickness or improve design. 3) the use of special equipment unit should establish a sound safety management rules and regulations, and in strict accordance Operation. Crane operator should hold special equipment operator certificate, crane exposed workers should wear full labor protection products, according to the provisions of the crane routine maintenance and routine checks. Electric wire rope hoist manufacturers, Shanghai Electric wire rope hoists, lifting from the Qingyuan Xinyu Xinyu Hoisting Machinery Limited. Road Zhiyuan, temper forward. Qingyuan Xinyu Crane Limited (xyqz0312.1688.com) aims to become and you win symbiosis, strategic partners to move forward, more determined to become the engineering, construction crane of the most influential companies, together with you leap, common success!