1. Precautions for the use of pinion shaft
a. If the pinion is damaged, it can be cut off directly by gas welding, but be careful not to damage the drive shaft.
b. When assembling the transmission part, it is necessary to do a good job of matching the keys without leaving a gap.
2. How to repair the gear shaft of the ball mill?
Ball mills are suitable for grinding various ores and other materials. They are widely used in mineral processing, building materials and chemical industries. They can be divided into dry and wet grinding methods. The wear phenomenon of the gear shaft transmission part of the ball mill is one of the equipment problems that need to be solved urgently in the equipment management of industrial enterprises. The wear of the gear shaft transmission part of the ball mill is mainly manifested in the wear of the bearing position, the keyway rolling key, the shaft wear of the keyway part, the scratches and wear of the shaft seal part, etc. Once the shaft head wear occurs, it will seriously affect the normal operation of the shaft.
Common repair methods for wear of gear shaft transmission parts of ball mills: At present, common methods for repairing wear of gear shaft transmission parts of ball mills in China are bushing, pitting, surfacing, brush plating, thermal spraying, laser cladding, etc. These repair techniques While promoting the improvement and development of technological processes, it is also restricted due to complex process conditions and on-site environment. Especially in the face of some sudden emergencies, huge equipment, complex disassembly and other equipment problems, these processes are obviously heartfelt. There is more than enough. The method of inserting shaft sleeves and pitting is a very old shaft repair method, which has poor repair effect and is rarely used at present.
3. A brief analysis of several other repair methods is now:
1）. Surfacing (repair welding) process Surfacing is a welding process in which a wear-resistant, corrosion-resistant, and heat-resistant metal layer is deposited on the surface or edge of the workpiece. Different workpieces and surfacing electrodes need to use different surfacing processes to obtain satisfactory surfacing results. The most common problem encountered in surfacing is cracking. Generally, heat treatment and machining are required after surfacing (repair welding). The biggest disadvantage of repair welding is that the thermal stress is concentrated, the heat affected zone is large, and it is easy to cause the deformation of the shaft.
2）. Thermal spraying process Thermal spraying is a metal surface processing method in which spraying materials in a molten state are atomized and sprayed on the surface of the parts through high-speed airflow to form a sprayed layer. Thermal spraying requires professional spraying tools. The main disadvantage of thermal spraying is that the bonding strength between the sprayed layer and the base metal is insufficient, the sprayed layer has defects such as pores, and it is difficult to machine.
3）. Electric brush plating process Electric brush plating is a process of obtaining a coating on the surface of a workpiece by electrolysis. Its advantage is that it can be repaired online, but its disadvantages are very obvious. The brush plating process of the brush plating process is limited by the amount of wear. Generally, the brush plating thickness of the brush plating coating is less than 0.2mm. When the amount of wear is greater than 0.2mm, the brush plating efficiency will be doubled, and when the brush plating layer is too thick, the brush plating layer will easily fall off during use and the service life will be short.
4）. Laser cladding process Laser cladding, also known as laser cladding or laser cladding, is a new surface modification technology. It adds cladding material on the surface of the substrate and uses a high-energy density laser beam to fuse it together with the thin layer of the substrate surface to form a metallurgical bonding additive cladding on the surface of the substrate to help users eliminate all causes. Losses and impacts caused by untimely and improper maintenance.
