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Crusher machine is used to crush the bulky material to smaller particle size that is more suitable for the production and construction. The productivity of crusher machine can be affected by the following 8 factors:
hardness of crushing ore
moisture of crushing ore
proportion of crushing ore
cleavage of the crushing ore
size composition of the crushing ore
nip angle of the crusher machine
revolution of the crusher machine
discharging port of the crusher machine
Now, let's drive in.
The hardness of ore is expressed by the compressive strength or protodyakonov scale of hardness (divide one hundred into the compressive strength), which can be used to divide the ore into three grades in the mineral processing. Obviously, the harder the ore is, the greater its compressive strength is, the more difficult it is to crush, and the lower the production efficiency. Conversely, the productivity efficiency is high.
The moisture of the crushing ore itself has little influence on the crushing effect. However, when the amount of mud or powder in the crushing ore is large, the fine material will agglomerate or stick to the coarse material due to the increased moisture, thus increasing the viscosity and reducing the speed of ore discharging and decreasing the productivity. In serious cases, the discharging port will be blocked, thus affecting the normal production.
The proportion of the ore is proportional to the productivity of the crusher machine. For the same crusher machine, the productivity is necessarily different when handling the ore with different proportion.For example, the productivity is high when crushing the ore with large proportion. On the contrary, the productivity is low.
The degree of ore cleavage will directly impact on the productivity of the crusher machine. The ore is easy to break along the cleavage surface in the crushing process. Therefore, when dealing with the ore with developed cleavage, the productivity of the crusher machine must be much higher than the crusher machine when dealing with the ore with dense structure.
When the content of coarse particles(larger than the size of the ore discharging port) in the crushing materials is higher or the ratio between the largest feeding and the width of the ore discharging port is large, the crushing ratio that the crusher machine needs should be larger, so the productivity of the crusher machine is reduced.
On the contrary, when the content of fine particles (close to or less than the size of the ore discharging port) is larger or the ratio between the largest feeding and the width of the ore discharging port is small, the crushing ratio that the crusher machine needs should be small, so the productivity of the crusher machine is higher.
For the jaw crusher and cone crusher, the nip angle is the angle between the two crushing faces (when the two faces are closest to each other). For the double roll crusher, the nip angle is the angle of two tangent lines that derivate from the contact point between the ore block and roller.
The nip angle of the crusher machine is an important condition to determine whether the crusher machine can break the ore smoothly.
The smaller the nip angle of the crusher machine is, the larger the ore outlet is, the smaller the crushing ratio is, so the ore is easier to pass, and the productivity of the crusher machine is also large.
The larger the nip angle of the crusher machine is, the smaller the ore outlet is,the larger the crushing ratio is, so the ore is more difficult to pass, and the productivity of the crusher machine is also small.
If the nip angle is too large, the ore jumps up and cannot be broken. If the nip angle is too small, the crushing ratio is difficult to meet the requirements of the crushing process. So, the nip angle of the crusher machine should be appropriate. The maximum nip angle of the crusher machine is determined by the friction coefficient between the crushing material and the crushing working face.
The friction angle of ore to steel plate is generally 17 degrees, so the nip angle should not be greater than 34 degrees. In the actual production, the nip angle of the crusher machine is far less than the limit value.
For jaw crusher and cone crusher, the revolution of eccentric shaft sleeve has the greater impact on the productivity. The revolution of all kinds of crusher machine should be in a certain range, otherwise the too high and too low revolution will reduce the productivity of the crusher machine.
Taking the jaw crusher as an example, its working process is composed of working stroke and return stroke. In the time of return stroke, the broken ore should be discharged in time.
If the swing times of the moving jaw is very large (that is, the rotation speed of the eccentric shaft is very fast), the broken ore cannot be discharged from the crushing chamber within the time of return stroke, so the ore is crushed again, thus causing the over-crushing phenomenon, and reducing the productivity.
If the swing times of the moving jaw swing is very small (that is, the eccentric shaft speed is too slow), the time of return stroke is long, and the productivity of the crusher machine is not high.
Similarly, the revolution of other types of crusher machine also should be appropriate. Increasing the revolutions within the allowable range will improve the productivity of the crusher machine. Conversely, reducing the revolution will decrease the productivity of the crusher machine.
The size of the discharging port is directly related to the nip angle and crushing ratio of the crusher machine. Within the allowable range, increasing the discharging port appropriately, the nip angle and crushing ratio will be reduced, and the productivity will be improved.
Conversely,reducing the discharging port, then the nip angle and crushing ratio will be increased,and the productivity is also decreased. The productivity of crusher machine changes with the change of ore discharging port.
The productivity of crusher machine can be affected by the above 8 factors. In order to give full play to the production capacity of the crusher machine, it is important to choose suitable model of crusher for your ore, material capacity and size requirement. Besides, in actual production, it is also important to operate the crusher correctly according to the professional manufacturer's guide.