Chute is the main component of scraper conveyor. Under the same processing technology and material, wear-resistant treatment of chute can greatly improve its service life and significantly increase the economic benefits of enterprises.
With the development of high-yield and high-efficiency mine, the use of high-power shearer and heavy scraper conveyor on the coal face greatly improves the output and efficiency of the working face, which is the development trend of mechanized coal mining. The role of scraper conveyor in the current mining face is not only to transport coal, but also the running track of the shearer, so it has become an indispensable main equipment in the modern mining process. The scraper conveyor can keep continuous operation, and the production can proceed normally. Otherwise, the entire coal face will be in a state of shutdown, so that the entire production is interrupted. The chute is the main body of the scraper conveyor and the carrying part of the scraper conveyor transport. The service life of the chute directly affects the normal production of the working face. Therefore, wear-resistant treatment of scraper conveyor chute to prolong its service life is of great significance. A customer of our company uses scraper conveyor produced by foreign companies for the first mining face, with a maximum power of 2×1050KW; The conveyor chain adopts 42×146, KA=165: the scraper spacing is 876 mm (per 6 chain links). Conveyor chute in the absence of wear-resistant treatment, the amount of coal is only more than 1 million tons, the chute has been severely worn, basically cannot be used. It directly affects the efficient production of the mine. After the P℉6/1142scraper conveyor chute was pulled out of the well, the wear of the chute was measured, and the maximum wear depth was nearly 14mm. Three measuring points are taken to measure the wear condition of the middle groove of scraper conveyor.
3, the scraper conveyor chute was wear-resistant treatment. The specific process and technical standards are as follows:
(1) Carry out wear failure analysis on the central chute, and select wear-resistant materials according to the failure analysis results.
(2) Paint removal and scaling treatment the parts of the scraper chute for surfacing welding use electric tools for mechanical paint removal and scaling treatment to reduce impurity infiltration and improve welding quality.
(3) surfacing welding
1. Preheating Before surfacing welding, the construction parts and welding materials are heat treated to keep them at a certain temperature.
2. The use of special primer welding material to surfacing the transition layer of the parts required for wear-resistant treatment, in order to neutralize and adjust the hardness gap between the base material and the wear-resistant layer of the medium plate, slow down the stress, and prevent the phenomenon of fault shedding.
3. After thermal insulation welding, the part of the chute after bottom treatment is thermal insulation treatment to keep it at a constant welding temperature.
4. Wear-resistant treatment for the chain path parts of furrow wear scraper conveyor, the special process of "autolysis alloy melting surfacing method" is adopted, and the wear-resistant surfacing treatment is carried out by using the high wear resistance of various welding materials. B For the coal surface of the middle plate and the wear parts of the scraper, use high wear-resistant welding materials for surfacing to form a fish scale mesh grinding layer. C For the special parts of rolling wear, special technology is adopted, and special welding materials are used for rolling resistance and wear resistance. D For the special wear parts where a variety of wear mechanisms work together, wear-resistant surfacing treatment is carried out successively by using different wear-resistant mechanisms of various wear-resistant welding materials.
Under the same working condition, compared with the chute without wear-resistant treatment, the service life of the treated chute can be extended by 1.5~2.5 times. The mother part of the treated chute is not scrapped due to wear and tear, saving a lot of equipment replacement funds and disassembly and installation costs, greatly reducing the repair workload, and increasing the production time. Significantly improve economic benefits.