The crushing wall and the mortar wall are the main components that work together to crush materials in cone crushing. When the cone crusher is in operation, the crushing wall will make a trajectory movement, and the distance from the grinding mortar wall is sometimes close to and sometimes far away. The materials are crushed by the crushing wall (moving cone) and the grinding mortar wall (fixed cone) for many times, and then some materials will be discharged from the open-edged discharge port. In the cone crusher, the crushing wall and the mortar wall are the main parts that directly contact the material, and after a period of use, it will inevitably produce wear. The service life of crushing wall and mortar wall is as shown in the figure:

In general, the broken wall and mortar wall of cone can be used for 6 months, but some users say that they need to be replaced after 2-3 months. Because its service life is affected by many factors, it will be worn to different degrees. When the thickness of the broken wall and the rolling mortar wall of the cone is worn to two thirds, or it is broken and the ore outlet is too large to be adjusted, it needs to be replaced.

2. Factors affecting the service life of crushing wall and mortar wall

In general, there are these factors that affect the crushing effect and service life of crushing wall and mortar wall: the content of stone powder and the humidity of stone, the hardness and granularity of stone, the feeding method, the quality of crushing wall and mortar wall itself, etc. 1. Stone powder content and stone moisture

When the cone crusher is working, if the stone powder content and humidity of the material are relatively high, it will easily adhere to the crushing wall and the rolling mortar wall during crushing. Over time, it will not only reduce the production efficiency, but also corrode the crushing wall and the rolling mortar wall and reduce its service life.

For materials with high stone powder content, they should be screened once before crushing, so that excessive fine powder can be avoided when crushing; For materials with high humidity, certain measures should be taken to reduce the moisture content before crushing, such as natural drying or mechanical drying.

2. Hardness and particle size of stone

According to the hardness of crushed materials of cone crusher, the degree of wear of crushing wall and mortar wall is also different. The higher the hardness of the material, the more difficult it is to break, the greater the impact load borne by the broken wall and the rolling mortar wall in production, and the service life will be shortened accordingly; When the hardness of the ore is the same, the larger the particle size of the ore entering the crushing cavity, the more serious the lining wear and the shorter the service life.

3. Feeding method

The feeding mode of cone crusher also has a certain influence on the service life of crushing wall and rolling mortar wall. If the feeding device of the cone crusher is improperly installed, or too much material is put into the crushing cavity, it will lead to uneven feeding, material blockage in the crushing cavity and other faults, which will cause excessive stress on the single side of the grinding mortar wall of the crushing wall, increase the cutting wear of the ore, seriously damage the lining plate and reduce the service life.

4. The quality of the broken wall and the mortar wall itself

The above are the external factors that affect the broken wall and the mortar wall, and the quality of the broken wall and the mortar wall itself is the most important factor. A good quality wear-resistant fitting has high requirements on the surface of the casting, and the casting is not allowed to have cracks and casting defects such as slag inclusion, sand inclusion, cold insulation, porosity, shrinkage cavity, shrinkage porosity and lack of meat that affect the service performance. At present, the crushing wall and mortar wall of cone crusher in the market are generally made of high manganese steel. With the continuous development of science and technology, the performance of wear-resistant materials is also constantly improving. On the whole, it is necessary to choose a material that can quickly harden the surface under the impact load to form a hard and wear-resistant surface, while still maintaining the original toughness of the inner metal, so as to improve the service life of the crushing wall and the rolling mortar wall.

Iii. Replacement of broken wall and mortar wall of cone break

When replacing the crushing wall and mortar wall of cone crusher, it is necessary to check the wear of fixed cone, adjusting ring, locking thread, counterweight and counterweight guard plate. If the wear is serious, it should be replaced with a new one, and then the lining plate should be installed, which can reduce the time for the second replacement and disassembly, saving time and effort. After installation, it is necessary to check whether the center of the liner is aligned, otherwise the liner will collide during operation, resulting in serious wear of the liner.

Replacement of rolling mortar wall

The mortar wall can be replaced on site. Unscrew the adjusting screw sleeve installed on the upper frame (pay attention to counterclockwise rotation), remove the upper chamber hopper assembly, lift the adjusting screw sleeve with hoisting equipment, remove the supporting plate bolt of the adjusting screw sleeve, and then remove the mortar wall for replacement. During assembly, clean the outer surface, butter the threaded surface of the adjusting screw sleeve, and install and fix it in reverse order.

matters need attention

There are U-shaped screws on the wall of the rolling mortar on the adjusting ring, and zinc alloy is injected between them to make them closely combined. When installing or replacing the rolling mortar wall, after working for 6-8 hours, check the fastening situation and tighten the U-shaped screws again.

Replacement of broken wall

The broken wall can be replaced on site. Lift out the spindle components and place them on a solid supporting platform, taking care not to damage the moving cone and spherical surface. At the same time, block all oil holes with cloth to prevent dust and impurities from entering. Dismantle the distribution plate, lock nut, lock washer and fusible gasket in turn, and weld two lifting lugs on the old plate at a distance of 180 degrees, so that the broken wall can be lifted out. When installing a new wall, two lifting lugs can also be welded on the position at a distance of 180 degrees.

matters need attention

The cone crushing wall is fixed on the cone body with a cone head, and zinc alloy is cast between them. After the newly installed or replaced cone crushing wall works for 6-8 hours, its fastening condition should be checked, and it should be fastened immediately if it is loose.

summary

The crushing wall and the mortar wall are important parts in the cone crusher. During the operation of the cone crusher, it should be noted that the materials put into the equipment must meet the crushing requirements, and it is strictly forbidden that the hardness is too high, the moisture is too high or other non-crushed materials enter the crushing cavity, otherwise the mortar wall of the crushing wall will fall off and the equipment will stop. At the same time, the feed of the cone crusher must be uniform, the ore must be fed in the middle of the distribution plate, and the material cannot directly interact with the crushing wall and the mortar wall to prevent uneven wear.