The tightness of the industrial chain sprocket should be appropriate. If it is too tight, it will increase power consumption and the bearings will be easily worn; if it is too loose, the sprocket will easily jump and derail. The tightness of the sprocket is: when it is lifted or pressed down from the middle of the sprocket, the center distance between the two sprockets is about 2%-3%. The sprocket should be installed on the shaft without swinging or skewing. In the same transmission assembly, the end faces of the two sprockets should be located in the same plane. When the center distance of the sprockets is less than 0.5 meters, the deviation can be 1 mm; when the center distance of the sprockets is more than 0.5 meters, the deviation can be 2 mm. However, there should be no friction on the side of the sprocket teeth. If the offset of the two wheels is too large, it is easy to cause derailment and accelerated wear. When replacing the sprocket, it is necessary to pay attention to checking and adjusting the offset. After the sprocket is severely worn, the new sprocket and the new sprocket should be replaced at the same time to ensure good meshing. Do not replace the new sprocket or the new sprocket alone. Otherwise, it will cause poor meshing and accelerate the wear of the new sprocket or the new sprocket. When the sprocket tooth surface is worn to a certain extent, it should be turned over in time (referring to the sprocket used on the adjustable surface) to extend the service life.

If the new sprocket is too long or stretched after use, it is difficult to adjust. The chain links can be removed according to the situation, but they must be an even number. The chain links should pass through the back of the sprocket, the locking plate should be inserted outside, and the opening of the locking plate should face the opposite direction of rotation. The sprocket should be filled with lubricating oil in time during work. The lubricating oil must enter the matching clearance between the roller and the inner sleeve to improve working conditions and reduce wear. The old sprocket cannot be mixed with some new sprockets, otherwise it is easy to produce impact in the transmission and break the sprocket. When the machine is stored for a long time, the sprocket should be removed and cleaned with kerosene or diesel, and then coated with engine oil or butter and stored in a dry place. First, find out the part with large offset error, so first measure which side the coupling is offset to, that is, measure the horizontality and coaxiality of the main shaft and the horizontality and coaxiality of the reducer main shaft, and re-level and align according to the quality standard to eliminate the fault. The reasons for the wear of the gears of the coupling of the lifting accessories are basically similar. In addition to the normal force, the connecting bolts are also subjected to additional bending moments, which causes them to break. For example, this kind of fault has been found before. The hoist is a JK-2.5/11.5 single-rope winding hoist. At that time, the concentricity deviation of the coupling was measured to be 2n, and the reducer side was low, causing the coupling of the lifting accessories to fail to work. The axial displacement of the inner gear ring exceeded the tooth width. After surveying and calculation, the reducer should be re-aligned according to the quality standard. After adjustment, it operates normally and the fault is eliminated. In addition, the horizontality and concentricity errors of the two shafts are large, causing the coupling to rotate unsteadily.