Improvement of fixed jaw plate structure of jaw crusher

Improvement of fixed jaw plate structure of jaw crusher

One of our China customers who has a PE600*900 jaw crusher to crush Lead-zinc Mine. After a long time running, the fixed jaw plate wear out very quickly. So he asked our engineers to help him to solve this problem.

Reasons for the transformation

According to the operation of pe600 × 900 jaw crusher, through long-term observation, it is found that the main reason for the difficulty in controlling the size of ore discharge opening is the wear of tooth profile of tooth plate. More important is the wear of the fixed plate. However, the main wear parts of the fixed plate are concentrated at 3 / 4 below the centerline of the fixed plate. The wear of the upper part is not large, which is only normal friction wear. Even if there is a certain wear, it will not affect the normal operation of the crusher. That is to say, only 3 / 4 below the centerline of a fixed plate has the maximum force and wear. Only one part of the wear, it is necessary to replace the entire fixed plate, not only time-consuming but also a serious waste of materials. The high cost of crushing directly affects the economic benefits of the concentrator. In view of this situation, under the condition of ensuring the overall structure of the toothed plate, ensuring the crushing cavity shape of the crusher, and keeping the technical parameters unchanged, the fixed toothed plate is divided into fixed plate and working plate. It is an integral tooth plate. In this way, the normal operation of the crusher can be achieved only by changing the working plate. This saves time and material.

Transformation scheme

In the transformation, the working part of the crusher is fixed tooth plate and moving tooth plate. The moving tooth plate is fixed on the moving jaw, and its main wear parts are concentrated in the middle. In the transformation, there is no transformation of the moving tooth plate, but the fixed tooth plate is mainly reformed. After the modification, the overall weight of the fixed toothed plate is increased by 200kg. Since the fixed toothed plate is connected with the frame, the increase of the fixed toothed plate weight has no adverse effect on the whole crusher.

Based on the working characteristics of the crusher, the fixed toothed plate is divided into upper and lower parts about 3 / 4 below the centerline. The working plate and the fixed plate are connected by flat head M30 screw. In order to ensure its strength, the fixed plate is thickened at about 1 / 3 of the centerline. The material is unchanged, and the tooth shape is still zgmn13cr2, as shown in Fig:

Fixed jaw plate after the change