Jaw crusher, jaw crusher, crushing equipment
1, hardness of ore crushed by crusher
The hardness of ore is expressed by its compressive strength or Platts hardness coefficient (compressive strength divided by 100 is called Platts hardness coefficient). In the process of mineral processing, the ore is divided into three hardness grades based on this. Obviously, the harder the ore, the greater its compressive strength, the more difficult it is to break, and the output is halved. On the contrary, the productivity is high.
2. Humidity of materials crushed by crusher
The humidity of the material itself has little effect on crushing, but when the material contains a lot of mud or powder ore, the fine-grained material will agglomerate or stick to the coarse-grained material due to the increase of humidity, thus increasing the viscosity, slowing down the ore drawing speed and reducing the productivity. In severe cases, it may even cause blockage of the ore outlet and affect normal production.
3. Specific gravity of ore crushed by crusher
The specific gravity of ore is directly proportional to the productivity of crusher. The productivity of the same crusher is necessarily different when dealing with ores with different specific gravity, and the productivity is higher when crushing ores with significant proportion, and vice versa. Productivity is very low.
4. Crush the ore with a crusher
The cleavage development degree of the ore also directly affects the productivity of the crusher, because the ore is easy to break along the cleavage plane, so the productivity of the crusher must be much higher than that of the ore with dense crushing structure.
5. Particle size composition of materials crushed by crusher.
When the content of coarse particles (larger than the size of the ore outlet) in the crushed materials is high and the ratio of the maximum feeding block to the width of the ore inlet is large, the crusher needs to achieve a large crushing ratio, so the productivity is reduced. On the other hand, if the content of fine particles (close to or smaller than the size of the ore outlet) is large, and the ratio of the maximum feed block to the width of the ore inlet is small, the crushing ratio to be achieved is small, so its productivity is high.
6, the meshing angle of crusher
The angle between jaw crusher and cone crusher is called meshing angle. The included angle between the two tangents drawn from the contact point between the ore block and the drum is called the meshing angle.
The meshing angle of crusher is an important condition to determine whether the crusher can crush ore smoothly. The smaller the meshing angle, the larger the ore outlet, the smaller the crushing ratio, the easier it is for ore to pass through and the higher the productivity. On the other hand, the greater the meshing angle, the smaller the ore outlet and the greater the crushing ratio, so the ore is difficult to pass through, so the productivity is also small. If the meshing angle is too large, when crushing the ore, it will make the ore jump upward instead of crushing, and even a safety accident will occur. The meshing angle is too small and the crushing ratio is too small, which can not meet the requirements of technological process. Therefore, the meshing angle of crusher should be appropriate. The maximum (limit) meshing angle of crusher is determined by the friction coefficient between the crushed material and the crushing working face, which can be obtained by force analysis.
The friction angle between ore and steel plate is generally 17 degrees, so the meshing angle should not be greater than 34 degrees. In the actual production process, the meshing angle of various crushers is far less than this limit.
7, the revolutions of the crusher
The revolutions of eccentric shaft of jaw crusher and eccentric shaft sleeve of cone crusher have great influence on productivity, and the revolutions of various crushers should be within a certain range, otherwise the productivity will be reduced if the revolutions are too high or too low.
Taking jaw crusher as an example, its working process consists of working stroke and no-load return. When returning empty, the broken ore should be fully guaranteed to be discharged. If the swinging times of the movable jaw are large, that is, the rotating speed of the eccentric shaft is fast, the crushed ore will not be discharged from the crushing chamber during the no-load return time, so it will be crushed again, resulting in excessive crushing and reducing productivity. If the moving jaw swings less times, that is, the eccentric shaft rotates too slowly, the idle return time is long, and the productivity of the crusher is not high. Similarly, the revolutions of other types of crushers need to be appropriate. Increasing the number of revolutions within the allowable range will improve the productivity of the crusher. On the contrary, if the number of revolutions decreases, the productivity will also decrease.
8. Crusher ore outlet
The size of the ore outlet of crusher is directly related to the meshing angle and crushing ratio of crusher. Within the allowable range, appropriately increasing the ore outlet will reduce the meshing angle and crushing ratio and improve the productivity. On the contrary, if the discharge port is reduced, the meshing angle and crushing ratio will increase and the productivity will decrease. The productivity will change with the change of the discharge port, so will all kinds of crushers. The productivity of the same crusher increases with the increase of ore outlet.
In order to give full play to the production capacity of the crusher, we should correctly grasp the operating conditions of the crusher, strive to feed the ore evenly, and make the crusher work under the conditions of large crushing ratio and high load rate. The so-called load factor is the percentage of the ratio of the actual production capacity of the crusher to the calculated production capacity. Load coefficient is an important sign of whether the crusher's potential is fully exerted.
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