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Factors Affecting The Life Of The Crushing Wall And Rolling Mortar Wall And Their Replacement Methods
2024-08-26
In a cone crusher, the crushing cavity is formed by the cavity between two lining plates: the cavity between the rolling mortar wall (fixed cone lining plate) and the crushing wall (moving cone lining plate). It can be seen that the crushing wall and the rolling mortar wall are parts that directly contact the material and are also the main wear-resistant parts in the cone crusher. This article answers questions about the service life of the crushing wall and the rolling mortar wall of the cone crusher and its influencing factors.
1. Service life of crushing wall and rolling mortar wall
The crushing wall and the rolling mortar wall are the main components that work together in the cone crusher to crush materials. When the cone crusher is in operation, the crushing wall will make a trajectory movement, sometimes approaching and sometimes far away from the rolling mortar wall. The material is squeezed and impacted multiple times by the crushing wall (moving cone) and the rolling mortar wall (fixed cone). Crushed, part of the material will be discharged from the open side discharge port. In the cone crusher, the crushing wall and the rolling mortar wall are the main parts that directly contact the material. After being used for a period of time, wear will inevitably occur.
Under normal circumstances, the crushing wall and rolling mortar wall of the cone crusher can be used for 6 months, but I learned that some users said that they need to be replaced after 2-3 months of use. Since its service life is affected by many factors, varying degrees of wear will occur. When the thickness of the crushing wall and rolling mortar wall of the cone crusher is worn to two-thirds, or cracks occur, and the ore discharge port increases to the point that it cannot be adjusted. , it needs to be replaced.
2. Factors affecting the service life of the crushing wall and rolling mortar wall
Generally speaking, there are these factors that affect the crushing effect and service life of the crushing wall and the rolling mortar wall: stone powder content and stone humidity, stone hardness and particle size, feeding method, the quality of the crushing wall and the rolling mortar wall itself, etc.
1. Stone powder content and stone humidity
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 rolling mortar wall during crushing. Over time, it will not only reduce the production efficiency, but also cause damage to the crushing wall and rolling mortar wall. Corrosion occurs on the wall, reducing its service life. For materials with relatively high stone powder content, they should be passed through a sieve before crushing, so that excessive fine powder can be avoided during crushing; for materials with high humidity, certain measures should be taken to reduce the amount of fine powder before crushing. Moisture content, such as natural drying or mechanical drying.
2. Hardness and particle size of stoneAccording to the different hardness of the materials crushed by the cone crusher, the degree of wear of the crushing wall and the rolling mortar wall is also different. The higher the hardness of the material, the more difficult it is to crush, the greater the impact load the crushing wall and the rolling mortar wall will bear during 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 smaller the lining. The more severe the plate wear, the shorter its service life will be.
3. Feeding method
The feeding method of the cone crusher also has a certain impact on the service life of the crushing wall and the 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 one side of the crushing wall and the mortar wall. Increase the cutting wear of the ore, causing serious damage to the liner and reducing its service life.
4. The quality of the crushing wall and the rolling mortar wall itselfUm9MZ">The above are the external factors that affect the crushing wall and the rolling mortar wall. The quality of the crushing wall and the rolling mortar wall itself is the most important factor. A good-quality wear-resistant accessory has a high value on the surface of the casting. Requirements, castings are not allowed to have cracks and casting defects such as slag inclusions, sand inclusions, cold shuts, pores, shrinkage cavities, shrinkage porosity, and missing meat that affect the performance. Currently, the crushing walls and rolling mortars of cone crushers on the market are not allowed. The wall is generally made of high manganese steel. With the continuous development of technology, the performance of wear-resistant materials is also constantly improving. Generally speaking, it is necessary to choose a surface that can harden quickly under the action of impact load to form a hard and wear-resistant material. The surface of the material, while still maintaining the original toughness of the inner metal, can increase the service life of the crushing wall and the rolling mortar wall.
3.Replacement of the crushing wall and rolling mortar wall of the cone crusher
When replacing the crushing wall and rolling mortar wall of the cone crusher, it is necessary to check the wear of the fixed cone, adjusting ring, locking thread, counterweight and counterweight guard plate. If the wear is serious, replace it with a new one and then install the liner. This can reduce the time of secondary replacement and disassembly, saving time and effort. After the liner is installed, 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 rolling mortar wall can be replaced on site. Unscrew the adjusting screw sleeve installed on the upper frame (note the counterclockwise rotation), remove the upper chamber hopper assembly, use lifting equipment to lift the adjusting screw sleeve, and remove the adjusting screw sleeve support plate bolts. Replace the lower rolling mortar wall. When assembling, clean the outer surface, apply butter to the thread surface of the adjusting screw sleeve, and install and fix it in reverse order.
Things to note
There are U-shaped screws on the rolling mortar wall on the adjustment ring. Zinc alloy is injected between the two to make them tightly combined. When the rolling mortar wall is newly installed or replaced, its tightening should be checked after 6-8 hours of work. And tighten the U-shaped screw again.
Broken wall replacement
Broken walls can be replaced on site. Lift out the main shaft components and place them on a strong support platform. Be careful 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. Remove the distribution plate, locking nuts, and locking washers in sequence. , fusible gasket, weld two lifting lugs on the old plate at 180° apart, and the broken wall can be lifted out. When installing the new wall, you can also weld two lifting lugs on the old plate at 180° apart. lugs, and then install them in the reverse order of disassembly, cutting off the two lifting lugs when finished.
Things to note
The cone crushing wall is fixed on the cone body with a cone head, and zinc alloy is cast between the two. After the newly installed or newly replaced cone crushing wall has been working for 6-8 hours, its fastening should be checked. If it is found to be loose, it should be checked immediately. Fasten.
Summarize
The crushing wall and rolling mortar wall are important components 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. Excessive hardness, excessive moisture, or other non-crushed objects are strictly prohibited from entering. In the crushing cavity, otherwise it will cause failures such as the crushing wall and the mortar wall falling off, equipment shutdown, etc. At the same time, the feeding of the cone crusher must be uniform, and the ore must be fed in the middle of the distribution plate. The material cannot directly interact with the crushing wall and rolling mortar wall to prevent uneven wear. If you have any other questions, please leave a message.