This paper introduces the general situation of mineral sizers crusher and its profile and layout design. The shape of the roller teeth and the structure of the roller teeth layout in the crushing box were designed. Adopt an efficient roller tooth shape and crushing anvil, the use of pressure, friction force, so that the material through the crushing chamber of the material for three stages of crushing, improve the reliability of crushing, crushing material phenomenon is less, and the mineral sizers crusher has a simple structure, high production efficiency, good cost performance, The design parameters and the transmission system of the mineral sizers crusher are designed, and the design of the roll teeth, crushing anvil, gear shaft, gear and belt pulley and other transmission parts are completed. Through the checking calculation of the gear, shaft and key, the scheme is proved to be feasible.
Selection of roll tooth profile and roll tooth layout
1, the tooth shape of the working tooth on the surface of the roller crusher adopts pyramid teeth, the edge of the 1 roller teeth into a convex circular groove, and the outer surface of the roller into concentric circles. In order to obtain the crushing material close to the cube, the surface of the roller adopts the layout of tooth arrangement of equal spacing rectangular lattice. The tooth of another roller is directly opposite the center of the prism, and the distance between the top of the tooth of one roller and the surface of another roller and the spacing between the two teeth is about the maximum particle size of the product, as shown in Figure 3.
2, the tooth shape of the working tooth on the surface of the roller adopts a cone tooth, the tooth shape is shown in Figure 4, every 4 roller teeth embedded in a tooth sleeve, the tooth sleeve is fixed on the hub by screws, the hub is square, the blade made of alloy is installed with screws in the part of the roller teeth cutting material connecting, the roller teeth into spiral arrangement. The old crusher adopts the way of meshing the roller teeth and the opposite roller surface, but adopts a series of crushing teeth through the key and shaft connected into a spiral, the use of teeth and teeth to roll the crushing material.
3. The roll tooth profile and arrangement of scheme 3 double-tooth roll mineral sizers are the same as those of scheme 2, but the difference is that each tooth roll is composed of a mandrel and a crushing tooth, which is connected with the mandrel by a key, and the spiral arrangement of the crushing teeth on the mandrel is realized by changing the keyway Angle on the crushing tooth, as shown in Figure 4.

Comparison of schemes
The roller teeth adopted in Scheme 1 are convex circular edge teeth to reduce the over-crushing phenomenon caused by the commonly used olecranon roller teeth. When the roller teeth of ordinary pyramid meshing with another roller are broken, because the edge of the roller teeth is a straight line and the opposite roller is an arc, the distance between the top of the roller teeth of one roll and the surface of the other roller, namely the maximum discharge particle size, constantly changes with the rotation of the roller. Therefore, the arrangement size of circular edge teeth is more uniform than that of ordinary edge teeth. And the particle size of the broken material in different parts of the teeth edge of the ordinary prisms roller is different, which will lead to uneven contact stress, serious local wear, reduce the service life of the teeth plate, increase the maintenance workload, and have an adverse impact on the production 1.
Scheme 2 adopts a different tooth shape and arrangement form from scheme 1. Its unique feature is that screws are used to connect the tooth sleeve with the wheel hub, and the roller crushing material is rolled between the teeth. It has the crushing efficiency which cannot be reached by the meshing of the roller surface and the roller teeth in the old crusher. The blade made of alloy is installed on the crushing tooth so that it can break hard materials, and when the crushing tooth wear is serious, only need to replace the blade, increase the service life of the crusher, the advantages are high efficiency, wear resistance, long service life, can break hard materials.
Scheme 3 uses the broken teeth to connect with the mandrel through the key, and realizes the spiral arrangement of the broken teeth on the mandrel by changing the keyway Angle on the broken teeth, which not only realizes the crushing effect of scheme 2, but also uses the key connection is easier than the traditional hub and roll teeth connection, has the advantages of simple structure and convenient installation, it is a new design way.
In summary, among the three schemes, scheme 3 is more suitable for the design requirements of double-toothed roll crusher, so Scheme 3 is selected as the tooth shape and roll tooth layout design of double-toothed roll crusher.
The innovation of this project is that most of the traditional crushers use 1 or several pairs of roller teeth to crush the bulk materials. And the installation of these rollers on the shaft is mostly aligned on the shaft, that is, their installation keys are in the same spatial Angle. This kind of traditional crusher doesn't work very well.
Through the structure optimization design of the mineral sizers, and the layout of various roller teeth comparative analysis, determine an efficient crushing roller teeth and layout, and the use of the crushing anvil to achieve three stages of material crushing, the use of belt pulley, gear, gear shaft to achieve system transmission. Meet the predetermined requirements of crushing material particle size.

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