SU1412805A1 - Laboratory shredder - Google Patents

Abstract

The invention relates to grinding materials used in laboratory-experimental and analytical practice, in which the grinding chamber is formed by coaxial grinding bodies in the form of cones. The aim of the invention is to increase the grinding efficiency by reducing the release of material from its capture zone. In order to achieve the objective of the invention, the conical working surfaces of the grinding bodies 1 and 2 move from bottom to top into parabolic, oriented mutually opposite in such a way that the gap between them gradually widens, the conical surfaces in the lower part of the bodies are parallel, and the height of the internal body is 2 / 3 are the heights of the outer body, and the parabolic surfaces of the latter and the inner body, respectively, are 1/2 and 1/3 of their heights. 2 hp f-ly, 3 ill.

Description

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about SP

The invention relates to a grinding device used in laboratory-but-experimental and analytical practice, and can be used in the mining, chemical, metallurgical and other industries.

; The purpose of the invention is to increase the efficiency of grinding by reducing the release of material from the zone of its capture. S FIG. 1 shows a laboratory grinder, barn, and its form; in fig. 2 - section A-L $ 3 of FIG. one; in fig. 3 is a diagram of the installation of a gap between the working surfaces of mele-iuHX bodies.

: The shredder contains a stationary outer melyush, its body 1, inside which there is an independent inner movable grinding body 2 with a shank 3. The chopper also includes an adjusting ufta 4, through which the shank 3 {helium 2 is connected to the drive shaft 5 electric motor 6, lid 7, closing, small body on top, loading nozzle B, supplying the material to be crushed | to the work area, receiving hopper Q, located under the grinding bodies, supporting racks 10, ensuring the stability of the entire shredder . ; The chopper works as follows;

The feed pipe 8 with the rotating engine 6 serves material for grinding. When rotating the drive shaft 5 of the engine 6, rotation through the adjusting clutch 4 is transmitted to the shank 3 of the internal grinding body 2 rotating inside the stationary external grinding body 1. The material on the loading nozzle 8 through the window in the flap 7 enters the upper gap between the grinding bodies and begins grind. The fragments are drawn into the gap between the working surfaces of the grinding bodies, where they are crushed to the size specified by the size of this gap. The shredded material is poured into the receiving hopper 9. The support stands 10 serve to install the engine 6, the inlet nozzle 8 and ensure the integrity of the whole shredder design.

The working body is designed to ensure the loading of the working space between the grinding bodies in their upper part. For this, the height of the inner movable grinding body is 2/3 of the height of the outer body, while the parabolic surface of the outer grinding body is 1/2 the height of the body, and the inner movable body is 1/3 of its height. As a result, a free space is formed, which is a self-diverging capture zone of the source material, which is conjugated with a parallel grinding zone, the capture zone being formed by the surfaces of grinding bodies made in the form of a parabolic

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Dov rotation. This free space is filled with the feed material and preliminary grinding occurs in it, until the material is drawn into the gap between the conical surfaces of the grinding media. In the working process, a part of the material may be ejected from this space in the upper part of the grinding bodies between the parabolic surfaces. To prevent such ejection, a lid 7 is installed on the outer grinding body, in which openings are provided for the feed inlet 8 and the shank 3 of the inner moving grinding body 2.

The shank enters the lower hole of the adjusting clutch 4, made with the condition of adjusting the entry of the shank in height. The drive shaft 5 of the engine 6 enters the upper opening of the coupling. The drive shaft and the shank fastener in the coupling are fastened with screws 11 and 12, respectively. By adjusting the entry of the shank into the sleeve in height, the size of the gap between the conical surfaces of the grinding bodies can be adjusted, because when the shank, which is made in one piece with the internal grinding body, is lowered, this body itself is also lowered. As a result, the gap between the conical surface of the inner body and the conical surface of the outer body increases. When the shank is raised, the clearance is reduced.

When using the invention, the size adjustment of the crushed fractions and the increase in the grinding speed are provided.

Claims (3)

1. A laboratory grinder containing coaxially mounted stationary external and movable internal grinding bodies, the conical working surfaces of which form a divergent gripping zone of the raw material adjacent to the parallel grinding zone and a drive shaft connected to the internal grinding body, distinguished by that, in order to increase the grinding efficiency by reducing the release of material from its grip area, the surfaces of the grinding bodies in the grip area are made in the form of paraboloids of rotation, while parabolic eska outer surface of the grinding body is equal to 1/2 of its height, and internal grinding body 1/3 of its height. 2. Grinder according to claim 1, characterized in that the height of the internal grinding body is 2/3 the height of the external body. 3. Shredder on PP. 1 and 2, characterized in that the internal grinding body is connected to the drive shaft by means of a shank and a coupling. 2