The sprocket assembly is a drive unit. Bearing strength and life is essential for large scraper conveyor bearings and more choice of double row aligning roller bearings or double row tapered roller bearings. Due to the large radial force, the bearing bearing position and force if the location of a longer distance. A bending moment is generated. While the axial force, the bearing will be pressed out of the bearing. And pull off the gland bolts. So that the whole sprocket component fatal damage. The best bearing position is that both ends are supported by the nearest sprocket. This also requires scraper nose frame also cooperate with each other, so that the bearing position with the nose frame of the arc block match. While minimizing the generation of bending moment. To ensure that the entire sprocket assembly will have a strong support in the overload process will not be damaged, see Figure 1. The drawback of this sprocket assembly is that the support arches are too close to the outer sides of the sprockets. So that the sprocket assembly of the axial strung caused difficulties. Scraper conveyor power and sprocket assembly components are interlocked with the majority of internal and external spline shaft assembly as a result of axial fixed. There is no way to take the initiative with the power of the Department of the result of the installation is active with the Department of Power Sprocket with the Department of matching spline spline installation is very difficult. Such bearings are used for axial movement is limited. While the radial force of the double row tapered roller bearings. Industrial sprocket There is a heavy scraper sprocket assembly structure, is the use of double row spherical roller bearings can overcome the bending moment on the role of the bearing. This kind of axle requires the bearing to bear the force to be big therefore the bearing outer diameter is bigger. In order to ensure that the scraper can run in the sprocket teeth, drum design can not be too large. Only allow the housing design on both sides of the board, see Figure 2. This structure is a significant drawback: the safety factor of the chain wheel shaft to be large, must ensure that the role of pulsating cyclic stress chain wheel axle stress concentration does not occur, otherwise the broken shaft of the situation are more. The reason is simple. Because the moment support point has reached the maximum point. Spherical bearings and bearing inner diameter of the cone can prevent the string on both sides of the bearing. While ensuring the life of the sprocket assembly