RU2049552C1 - Mill - Google Patents

Abstract

FIELD: construction. SUBSTANCE: mill has housing 1, rotor 4 made up as disks, axles 5 connecting the disks at the top part, milling members mounted on the axles, branch pipes for charging and discharging material, and port 1 with the adjustable threshold positioned at the bottom discharging part of the mill housing. EFFECT: improved quality of milling. 2 cl, 3 dwg

Description

 The invention relates to a device for producing talc, cement, graphite, chalk, limestone, slag, etc. in the building materials industry with boundary particle sizes.

 Known aerobic mill [1] containing a housing, a rotor with solid disks and beats in the form of blades, rotor bearings, engine, nozzles.

 A mill of this design grinds the source material with its removal in the form of a dusty air mixture into a further technological process, which does not allow to obtain a product with boundary particle sizes.

 The closest in technical essence and the achieved result to the proposed installation is a centrifugal mill [2] containing a casing, a rotor with chisels, rotor bearings, nozzles (prototype).

 The disadvantages of such a mill are low productivity, insufficient classification of the material according to the boundary sizes of the particles of the crushed material, since the yield of large particles is not limited by anything.

 The purpose of the invention is the increase in productivity with obtaining material with boundary particle sizes both in the upper and lower limits.

 This goal is achieved in that the mill, comprising a housing, a rotor with supports and crushed organs fixed around the perimeter of the rotor, nozzles for supplying raw material and removing fine fractions in the form of an air mixture, is equipped in the lower discharge part of the mill body with an adjustable threshold with estrus installed in front of the discharge mill window.

 A mill for producing materials with boundary particle sizes allows a thin (small) product to be separated from the crushed material through the discharge pipe in the form of a mixture, and the size of large particles is achieved depending on the threshold value with respect to the bottom of the mill body.

 In FIG. 1 shows a diagram of a mill for producing a product with boundary particle sizes; in FIG. 2 node I in FIG. 1; in FIG. 3 is a view along arrow A in FIG. 2.

 The scheme contains a housing 1 with a pipe 2 for supplying the initial product and the supply of process air, a pipe 3 for removing fine fractions of the product in the form of a dust-air mixture.

 The circuit contains a rotor 4 with axes 5, beats 6, nozzles 7 and a discharge window 8 for unloading material with boundary particle sizes. An adjustable threshold 9 with estrus 10 is installed to the discharge window 8. An adjustable threshold 9 with grooves 11 is fastened with screws 12 to the plate 13, which has a window 8 as well as a threshold 9.

 The mill operates in the following sequence. The crushed material is loaded through the pipe 2 into the mill housing 1, which also receives gases (clean or dusty air). In the housing 1, the material is crushed due to the rotor 4 rotating on the supports 7 with the beater 6, which are mounted on the axis 5.

 Small particles (more than the minimum boundary size) of the crushed material by the air flow and centrifugal forces created by the rotor 4, in the aerated state are removed into the further process through the pipe 3.

 Not released particles together with an air stream are crushed to the size no more than the maximum boundary size. This is done by blocking the window 8 with a threshold 9 by moving along the plate 13 of the threshold 9 with estrus 10.

 The crushed material with boundary particle sizes at the upper and lower limits through the window 8, the threshold 9 is discharged along estrus 10. To smoothly adjust the height of the threshold relative to the window 8, there are grooves 11 at both ends of the threshold 9, due to which the threshold 9 with estrus 10 is attached to the plate 13 screws 12.

 The use of the proposed mill to obtain a product with boundary particle sizes will increase its productivity by at least 25% due to the installation of an adjustable threshold, since otherwise the necessary product can be obtained with a two-stage classification.

Claims (2)

 1. MILL, containing a horizontally located housing with supports, in which a rotor is installed with grinding organs located around the perimeter, loading and unloading nozzles, characterized in that an unloading window with an adjustment threshold is made in the lower end part of the housing.  2. The mill according to claim 1, characterized in that the threshold is equipped with estrus.

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