How to reduce the wear of the conveyor chain of the bucket elevator

2012-04-09 08:42:16 How to reduce the wear of the conveyor chain of the bucket elevator? When the chain passes through the head and tail wheels, it causes the pin shaft to roll relative to the outer chain plate, and it is accompanied by piercing and unfavorable friction. The gear-opening pin rolls synchronously with the pin shaft, rubbing and scratching on the outer chain plate to form a bright circle, and when worn to a certain extent, it will fall off, causing the pin shaft to escape the outer chain plate and fall off. The head vibration of the hoist exceeds 12mm/s and is accompanied by a strong impact. The assembly of the pin shaft and the outer chain plate should be a large interference tight fit, but the actual processing and assembly accuracy does not meet this technical requirement. The clearance fit causes the pin shaft to roll relative to the outer chain plate and wear off the gear opening pin, which is the fundamental reason for the outer chain plate to fall off. When conveying abrasive cement materials, the hard material particles enter between the sleeve and the pin to form abrasive wear. Abrasive wear is the main failure mode of the pin and the sleeve. The weak link of fatigue failure is the inner and outer chains. board. The surface hardness of each part is the main factor affecting its wear resistance. It is necessary to ensure wear resistance and fatigue resistance. It is necessary to match the surface hardness of the sleeve, pin and roller. The surface hardness of the pin shaft of the conveyor chain is severely insufficient and the wear resistance is poor. A large amount of wear in a short period of time causes the chain pitch to change, increase the shock and vibration of operation, and deteriorate the chain transmission conditions, which are important reasons for the chain breaking accident. The high-speed gear shaft of the reducer of the transmission mechanism broke repeatedly, mainly due to abnormal vibration and peak load caused by the deterioration of the transmission condition of the loading conveyor chain. Seen from the section of the gear shaft, it is fatigued and broken, and the test results also show that the transmission mechanism itself does not have manufacturing defects and insufficient installation. Solution: Replace the hoist with a new chain. For the production of the new chain, we have made the following technical improvements and requirements: optimizing the structure, strengthening the processing technology, and ensuring the processing and assembly accuracy of the parts. The structure of the pin and the sleeve with the chamfered edge is adopted. The assembly of the pin and the outer chain plate, and the sleeve and the inner chain plate adopts a tight fit with large interference, which solves the problem of relative rolling between the pin and the outer chain plate. . Optimize material selection and heat treatment process to improve wear resistance and fatigue resistance. Sleeve: material 40Cr, quenching treatment HRC50～54; pin: material 20CrMnMo, carburizing and quenching HRC58～62, carburizing layer depth 1.5～2mm; roller: material 40Cr, quenching treatment HRC48～52; inner and outer chain plates: material 65Mn , Using punching, normalizing (HB280～320) and extrusion process.

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