Development of the roller center rotating device of the rake thickener

 The rake thickener is the main concentration equipment of the beneficiation plant and an important link in the beneficiation system; it is used for the purpose of clarifying the muddy water after washing, and is used as circulating water for washing, and at the same time, it can recover the ore settlement. Therefore, the rake thickener is the key equipment to maintain the normal production of the washing plant. When the rake thickener fails, a part of the washing mud water cannot be clarified. For example, if this part of the washing water is recycled, the washing water concentration will gradually increase, and the washing production will be interrupted within a few hours.

The mud settling equipment originally used in the washing plant is a rake thickener with a peripheral drive caster type. The central column transmission bearing of the thickener often has the ball being squeezed away, which increases the running resistance of the rake frame and causes the production of beneficiation. Interruption; when dealing with faults and replacing the bearings, you need to drain the water in the rake thickener pool, and then lift the upper cage.

The structure of the original rake thickener center column transmission device is that a special pressure bearing is arranged between the upper rotating frame and the lower fixed frame. This kind of bearing structure is circular, the rolling ball is installed on the cage and placed between the upper and lower bearing rings, and the lower bearing ring is installed on the fixed bracket. The upper rotating bracket is fixedly connected with the rake frame and can be placed on the center column, and the rake thickener rotates along the center column. Because of this structure, the pressure bearing is in a relatively humid environment during long-term operation, and it is inconvenient to inject oil. It is also subject to the weight of the rake frame, the steady flow cylinder and the settled mud for a long time, but it is corroded and worn out. It can reduce the strength of the cage and increase the gap with the ball after wear. Long-term operation will cause serious deformation of the bearing cage. After being squeezed by the balls and the upper and lower frames, the bearing cage will also be broken. After the bearing cage is deformed and fractured, the movement gap between the upper and lower frames of the ball is increased, and the remaining body of the bearing cage causes the balls to squeeze each other, which will eventually cause the balls to be squeezed. After the bearing is damaged, the center transmission can only rely on the interactive friction between the upper and lower shaft rings. The increased friction and the squeeze between the balls increase the resistance distance of the rake frame. In this case, the rake thickener The applicable mud sedimentation thickness is reduced. When the mud volume in the pool is increased, long-term operation will cause the rake to be crushed or the motor to burn, which will interrupt production.

From the perspective of central transmission, the pressure bearing structure between the upper and lower frames of the original design frequently fails during actual production. The main problem is that the pressure bearing structure is not suitable for the transmission under the special working conditions of the rake thickener. Therefore, the original pressure bearing structure is transformed into a roller transmission.

According to the analysis of the effect: after the transformation is completed, because an oil injection pipe is connected to each roller oil injection hole, the oil can be injected on the rake platform, which is convenient for maintenance, low wear during operation, and low failure rate, making the maintenance cycle longer; After the replacement of the roller drive, the friction of the center column transmission is greatly reduced, and the running resistance moment of the rake frame is reduced, so that the thickness of the sedimentation mud adapted to the rake thickener is increased compared with the original bearing structure; You can observe the running status of the wheel on the top, so as to find all kinds of faults. When replacing the rollers, there is no need to drain the water from the rake thickener, nor to lift the upper cage, and the replacement can be completed on the cage.

After the center column bearing structure of the rake thickener was transformed into a roller structure, after several years of operation, the effect was good, and there was no failure. It not only increased the capacity of the mud water treatment system, but also reduced the impact of production, but also contributed to other mineral processing. The transformation of the rake thickener in the factory provides an effective attempt.