Mineral sizer crusher is a new type of crusher introduced by the company in the late eightiaes. This crusher is completely different from the traditional roll crusher, it uses the "volume compression principle", using the combined action of shear and tension to break materials. Instead of the traditional extrusion crushing method, the crusher has the advantages of small volume, low power consumption, high productivity and uniform discharge particle size, which is especially suitable for downhole operation and crushing field. It has the advantages that other kinds of crusher are incomparable.
The main working parts of mineral sizer crusher are two parallel mounted tooth mixing, each tooth roller is arranged along the axial direction with a certain number of tooth rings, each tooth ring is distributed with a number of large roller teeth. A crushing rod is arranged in the middle of the lower part of the two rollers. The crushing process is divided into three stages: in the first stage, the material is initially crushed and bitten by the main impact shear crushing; in the second stage, the "principle of volume compression" is used for crushing, mainly by shear, bending and partial extrusion; in the third stage, the crushing rod is crushed, and the crushing mechanism is similar to that in the second stage.
In the second stage of the crushing process. The space volume contained by the two relative roller teeth gradually decreases from large, and the large material held is therefore forced to be broken. Because of the staggered arrangement of the roller teeth, the material with larger particle size is held by three teeth (one tooth on one pair of rollers, two teeth on the other roll). If the radius of the three clamping points is different, the linear velocity will be different. Because R1 is greater than R2 and R3, so V1 is greater than V2 and V3, so the three clamping points on the material to produce force, including shear, bending and partial extrusion. This is completely different from the traditional roll crusher by pure extrusion crushing, it makes full use of the material shear strength and bending strength is much smaller than the compressive strength of the properties of production capacity is the main performance index of double-tooth roll crusher, directly related to the crusher design of the selection of parameters, is also an important basis for users to choose the machine. So how to determine the production capacity is very important. In the traditional production capacity calculation formula of roll crusher, it is generally assumed that the material passes through the gap between two rolls at the same speed. The main difference between mineral sizer crusher and traditional roll crusher in structure is that the teeth of mineral sizer crusher are high and large, which directly affects the speed of materials passing through the two-roll gap and the ability of feeding and discharging, and the gap between rollers is much larger than that between ordinary roll breakers. Therefore, it cannot be simply considered that the speed of material passing between two rolls in mineral sizer crusher is the same.
In this paper, a method for calculating the production capacity of mineral sizer crusher is proposed. Its basic idea is that the production capacity of crusher is equal to the total volume of the material between two rollers minus the volume of all the roller teeth in the unit time when the roller teeth are regarded as material. By analyzing the crushing process and characteristics of crushing force of mineral sizer crusher, it can be seen that this crusher has outstanding advantages over traditional crusher. According to the structural characteristics of this crusher, the production capacity calculation formula derived by the difference method is used. It was proved by mineral sizer crusher to be feasible and practical.