The quality of the 1 plate hammer bolts is poor, because the quality of the bolts is poor, often loosening and breaking, causing the hammer to loose, fall off or break.
The quality of the 2. plate hammer is made of the high manganese steel, which is seen from the fracture, and the pores and even holes are visible, and the structure is larger, and the quality of the casting and heat treatment is poor.
3. improper use and maintenance, because the plate hammer is often broken, the operator’s workload is larger and the labor intensity is larger. Therefore, after the new board hammer is installed, it is lazy to stop the machine to check, so that the loosening of the bolt can not be fastened in time.
(1) remanufacture the bolt mold, so that the elliptical head of the bolt and the contact surface of the screw hole of the board can be in good contact. At the same time, the thickness of the screw thread teeth is controlled in the size allowance, and the unloading groove is processed to prevent the stress concentration from breaking.
(2) in view of the quality problem of plate hammer, our factory used the plate hammer of the original crusher factory, basically met the quality requirement.
(3) strengthen the management of use and maintenance. First, when the plate hammer is installed, the plate hammer hole and the sands and burrs of the slot must be removed to make the connection smooth. Secondly, when the fastening plate is bolt, the ellipsoid head should be hammered by the fastening edge; then, the bolt fastening situation should be checked in time for about half an hour after operation, and then the nut and the thread are welded to prevent loosening.