SU1509113A1 - Centrifugal mill - Google Patents

Abstract

The invention can be used in the construction, mining and other industries of the industry. The purpose of the invention is to increase the grinding efficiency. The proposed centrifugal mill comprises a housing 1 with a hinged opening hatch 2, a feed hopper 3 with an elastic flap 4, a grinding chamber made in the form of a horizontal bowl 5 with steps 6 where the bowl 5 is rigidly connected to a vertical channel 7 rotating in a bearing 8 coaxial a rotor 9 is installed with the bowl 5, made in the form of a vertical shaft 11 rotating in a bearing 10, on which crosses 12 with brackets 13 and clamps 14 are fastened, cascades fastened by hinges 16 with brackets 13, unlocking pipe 17, mated with the airway system 18 with the gate 19. 1 Cp f-ly, 3 ill.

Description

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31509113

The invention relates to devices for fine continuous grinding of material and can be used in construction, mining and other industrial sectors.

The purpose of the invention is to increase the efficiency of grinding.

Figure 1 shows the centrifugal tO mill, general view; in fig. 2 and 3 - about the same, another version.

The mill (Fig. 1) comprises a housing 1 with a hinged opening hatch 2, a feed hopper 3 with elastic suspension 4, a grinding chamber embedded as a horizontal bowl 5 with steps 6 where the bowl 5 is rigidly connected to a vertical shaft 7, turn- In the bearing 8. A rotor 9 is mounted coaxially with the horn 5 of 5; it is made in the form of a vertical shaft 11 rotating in the bearing 10 on which crosses (couplings) 12 with brackets 13 and clamps 14,25 are fixed; hinges 16 with brackets 13. The discharge nipple 17 is mated with the air duct system 18 and the gate gate 19. For loading of fine material the vertical shaft M can be made hollow. The rotation of the horizontal plate 5 to the rotor 9 is transmitted through the V-belt transmission of individual drives (not shown) to the pulleys 20, and 21. 3

In the mill (Fig. 2), the hollow vertical shaft of the rotor 9 can be made: not in the form communicated with the airway sistem, 18 discharge pipe 11 with a perforated sphere-like on the 40 non-right side 22 and a protective visor 23. The horizontal bowl 5 ( Fig. 3) can be made with a vertical concave hollow shaft 7 mounted in the bearing 8. Inside the hollow shaft 7. 45 mounted on the support roller 24 and in the bearing 25, the working shaft 11 of the rotor 9.

Centrifugal mill works as follows.

The source material through the feed funnel 3 or hollow vertical shaft 11 (Fig. 1) enters the mill and flows to the bottom of the bowl 5. Under the action of centrifugal force, the material moves up the side internal 55 surface and None 6, is crushed and struck against the encountering rotating percussion blades 15: .. Since the force is striking, the degree of abrasion

The material of the blade 15 depends on the angle of attack of the particles flying off the ledge, the brackets 13 using clamps 14 are made with the possibility of rotation around the horizontal axis. The destroyed material is divided into fine particles - the finished product, which is carried by the air flow through the discharge chute 17 through the air duct 18 to the dust-absorbing device, for example, a cyclone or a classification chamber with filtering grids, where the separation of particles into classes takes place. size. The tonnage of the product that is sucked off by the air flow from the grinding chamber is controlled by the speed of the air flow by means of the gate 19. Large particles that are not caught by the air flow fall back to the bottom of the bowl, and the cycle is repeated until they are completely crushed. However, a significant proportion of particles falls not at the bottom of the bowl 5, but at step 6, from where the centrifugal forces move up to the next tier and are hit by the blades 15. Those particles that have gone through all the steps have not collapsed, are carried along the side surface of the bowl 5 to housing 1 and again flow down.

The particle grinding cycle is repeated. In the case of metal or very strong particles (pieces) hinge, hinging the connection of the impact blades 15- allows you to avoid their damage.

The number of stages (Rus) and crosses with impact blades is determined by calculating the path, depending on the performance of the mill, the size and strength of the source material. The goal of uniform distribution of the impact blades in the projection on the horizontal plane of the crosspiece 12 is fixed relative to the other at an angle.

With a different version of the mill (figure 2). the source material through the feed funnel 3 and nozzle-shaft 7 enters the mill and flows through the protective visor 23 to the bottom of the bowl 5. During the grinding process, dust and fine particles of the finished product through the holes of the spherical tip 22 along the vertical hollow shaft 11 of the rotor 9 are blown away by air flow into a cyclone.

The principle of operation of the centrifugal mill (fig.Z) is similar to the variant of figure 1

51509113

The difference lies only in its design.

The use of the proposed centrifugal mill for fine grinding of the material improves the efficiency of the grinding process with simultaneous twisting of its productivity, especially lumpy material, and also increases the degree of crushing with relative savings of energy resources during grinding per unit of finished product.

a rotor with crossings mounted on a vertical shaft and percussion blades connected to the latter by means of brackets located above the bowl steps, characterized in that, for the purpose of grinding efficiency, the side surfaces of each stage are spherical in shape, the brackets are mounted on the crosses with the possibility rotation around their axis, and a stepped rotor and a step bowl mounted with the possibility of counter-rotation.

Formula

inventions 5

Claims (2)

1. A centrifugal mill, comprising a casing, loading and unloading nozzles, a grinding chamber in the form of a rotating bowl with a stepped inner surface, a stepped 2. Mill pop. 1, characterized in that the center of each sphere forming the inner surface of the bowl step is located on its axis and shifted from the axis of the corresponding bracket to the height of the step.