SU1727881A1 - Crusher rotor - Google Patents

Abstract

The invention relates to rotary crushers and can be used for grinding plastic sponge materials such as titanium sponge, copper sponge, iron sponge and others in the metallurgical industry. The invention is aimed at expanding the field of application and increasing efficiency through the use of standardized parts and the choice of cutting face geometry. The rotor of the crusher includes a housing, cutters, crushing segments and fasteners. New in the crusher rotor is the execution of the rotor body in the form of a prism consisting of three-sided groups, one face of which forms an isosceles triangle when connected to the center of the rotor, the other is directed along the radius and connects the first face to the third The angle to the axis of the cutter hole, which is inclined at an angle corresponding to a negative front angle of the cutting face, is 3-15 ° C, while the teeth of the crushing segments are made with a front negative angle equal to 3-15 ° A; . 4 il. S

Description

The invention relates to the grinding of materials, namely rotary crushers, and can be used to grind plastic spongy materials such as titanium sponge, copper sponge, iron sponge and others in the metallurgical industry.

The aim of the invention is to expand the scope and increase efficiency by using standardized parts and choosing the geometry of the cutting edges.

Figure 1 shows the rotor of the crusher, a general view; figure 2 - diagram of the forces acting on the cutter and the tooth: in fig.Z - section aa in figure 1; figure 4 - the same. option.

The rotor of the crusher consists of body 1, plates 2, cutters 3. The plates 2 are attached to body 1 with bolts 4. There are samples in the plates 2 that fix the cutters 3. set by their taper shanks to the corresponding cone holes 5 in the body 1 of the crusher rotor. The axis of the holes 5 are inclined at an angle corresponding to the negative front angle of the cutting face and equal to 3-15. In the embodiment of the rotor of the crusher using as the cutting tool of the crushing segments 7, the supporting surfaces 6 on the rotor serve as supporting ones for the said segments 7 made with teeth 8. having a negative rake angle.

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Equal 3-1. Crushing segments 7 are fastened with the same bolts 4 as lining 2. This angle helps prevent plastic spongy materials from sticking to the front edges of the cutting tools.

This is due to the fact that the crushable material, when exposed to the tool, slips along its front face, not nalip. If sticking occurs, the subsequent mass of the crushed material shifts the adhered material, since its adhesion force to the surface of the front edge of the tool is insufficient to keep it on the surface of the front edge of the tool.

In the above diagram, the forces acting on the cutter are: Q is the resistance force of the crushed material, PN is the normal component of the resistance force of the crushed material, Pr is the horizontal component of the resistance force of the crushed material, F is the friction force between the crushed material and the cutter material.

F PN: tg p. .

where p is the friction angle tangent, Pr PN tg a. therefore, with a-tp, Pr F.

With equal forces Pr and F, the crushed material seems to remain in place, and the rotor, overcoming the resistance of the material being crushed, continues to rotate.

The use of various cutting tools extends the field of application offered by a rotor crusher. In addition, the choice of cutting face geometry eliminates sticking of the crushed material on the front face of the cutting tool, and consequently, increases the efficiency of the crushing process.

Claims (1)

Invention Formula Crusher rotor, including body, cutters, crushing segments and fasteners, characterized in that, in order to expand the field of application and increase efficiency through the use of standardized parts and the choice of the geometry of the cutting edges, the rotor body is made in the form of a prism, consisting of triangular groups , one face of which forms an isosceles triangle when connected to the center of the rotor, the other is directed along the radius and connects the first face to the third, the third is at right angles to the axis of the hole to set p Ezec, which is inclined at an angle corresponding to a negative front angle of the cutting edge and equal to 3-15 °, while the teeth of the crushing segments are made with a negative rake angle equal to 3-15 °. ./ . &. Aa jP # r, 3 Pvr. four