Mineral sizer crusher is a equipment that uses two sets of separately driven roller shafts to break materials by the extrusion force and grinding shear force generated by relative rotation, which can be used for fine crushing of ores, rocks and refractory materials with high and medium hardness in mineral processing, chemical industry, cement, refractory materials, abrasives, building materials and other industrial sectors. In the working process of mineral sizer crusher, the roller tooth is a key and easy to grind part, which often appears wear phenomenon. This paper mainly introduces the countermeasures of roller tooth wear.
1) Increase the hardness of roll teeth
In order to increase the hardness of the roll tooth, surfacing the surface of the roll tooth to make the hardness of the tooth surface reach HRC58 or above.
2) surfacing of roll tooth surface
Because the roller teeth of mineral sizer crusher are made of high manganese steel alloy steel, the welding performance is relatively poor. High technical content is required for welding electrode material selection and surfacing construction. After selecting suitable wear-resistant electrode, surfacing is carried out directly on the surface of roll teeth. For high teeth, 5mm transition layer and 15mm wear-resistant layer are used for surfacing, and for low teeth, 2mm~5mm repair is carried out.
3) Reasonable distribution of high and low teeth
Due to the abnormal wear of the roller teeth, all teeth are ground into the same height, has been unable to distinguish the original high teeth and low teeth of the specific position. According to the number and layout principle of high teeth and low teeth, the distribution scheme can be developed, and the place of high teeth can be marked, so as to accurately construct in welding.
4) Surfacing method
Firstly, the tooth plates of mineral sizer crusher are removed from the crusher rotor and laid flat. Polish all parts to be surfacing with a polishing machine. Dc welding machine is adopted, the welding line is reversed, and the surfacing welding process is adopted. The current of wear-resistant layer is controlled at 150~180A, and the current of transition layer is controlled at 90~110A. Control the temperature of the welding layer below 100 degrees Celsius, layer surfacing welding to the required thickness, single layer thickness is controlled within 1.5mm~2.0mm.