The sprocket is very important as the driving device of the scraper conveyor.Due to the long working hours of the scraper conveyor, the harsh working environment, and the development of the load situation, the wear of the sprocket is very serious during the use process, which will cause different failures, cause the work face to stop production, cause different failures, and cause the work face to stop production. Cause economic losses.

Analysis of the reasons for the failure of the sprocket:

1. The influence of the chain on the sprocket

The coal mine has high humidity and dust, and the working environment of the scraper conveyor is harsh.In the process of power transmission, the shaft and the sprocket are connected by a spline to realize torque transmission.In the long-term high-load work process, the stress concentration at the meshing position of the sprocket and the chain generates high temperature, which leads to wear, pressure feed and adhesion between the sprocket and the chain at the sprocket socket.In addition, dust affected by the environment will stick to the chain and act as abrasive particles, causing the sprocket to peel off and accelerate the wear of the sprocket.

2. The influence of materials on the sprocket

The sprocket is the load-bearing part of the scraper conveyor, which requires high strength and high toughness in performance.The existing sprocket material has poor toughness, and the hardness is limited after being tempered and tempered. Therefore, the strength of the chain socket is poor, and the sprocket tooth is easy to break during work.The use process cannot achieve high strength, high toughness and high wear resistance, and the sprocket is prone to wear and failure.Therefore, the properties of the material have a great influence on the wear of the sprocket.

3. The influence of processing technology on sprocket

At present, the chain sockets of the sprocket of the scraper conveyor are processed by a single tooth on a milling machine. The processing quality depends on the craftsman’s scribing accuracy and the craftsman’s manual operation, and each chain socket is aligned and processed, and the chain socket is difficult. To achieve smooth and smooth transition, the surface roughness is very low. Moreover, the existing heavy-duty double-chain scraper conveyor uses left and right sprockets in pairs. This processing technology makes it difficult for each chain socket to reach equal division. My heart is also difficult to achieve consistency. When the left and right sprockets are processed in pairs, the friction between the sprocket and the chain is large, the stress on the single tooth is uneven, and the tooth with high stress wears quickly.Therefore, the processing quality of the sprocket is very important to the wear of the sprocket.The large error and low precision of the chain socket processing will also reduce the wear resistance.

The improvement of the wear resistance of the sprocket of the scraper conveyor is of great significance to the production capacity of the fully mechanized mining face.Through the gap of the reasons for the failure of the sprocket, comprehensive consideration of the chain, materials and processing status, under the condition of saving production costs, as far as possible improvement measures in processing technology are proposed to fundamentally extend the service life.