RU2665100C1 - Centrifugal disk grinder - Google Patents

Abstract

FIELD: disintegrators and crushing devices.SUBSTANCE: invention relates to the various materials crushing devices and may be used in production of construction materials and other industries. Device comprises the cylindrical body (1) with the loading (2) and unloading (3) pipes. Device includes oppositely rotating upper (4) and lower (5) discs with impact elements in the form of a spiral (6), which are directed in opposite directions to the upper (4) and lower (5) disks. Each of the discs includes a conical portion (7) with an inclination angle of the generatrix to the horizon that exceeds the angle of the natural slope of the material, to which the horizontal peripheral ring (8) is rigidly attached. Gap between the conical parts (7) of the upper (4) and lower (5) disks is equal to (2…5)D, where Dis the maximum particle size of the initial material. Clearance between the horizontal peripheral rings (8) of the upper (4) and lower (5) disks is (1…5)d, where dis the maximum particle size of the finished product. Tip of the conical part (7) of the lower disc (5) is the blade spreader (9).EFFECT: increased efficiency of the grinding process is ensured by means of increasing the number of particle collisions and by means of increasing the abrasing loads and crushing loads on the material to be grinded.1 cl, 3 dwg

Description

The invention relates to devices for grinding various materials and can be used in the production of building materials, as well as in other industries.

A known design of a centrifugal mill containing a stepped housing, each subsequent step in which, counting along the movement of the material, is made of a larger diameter, a stepped rotor with beams horizontally located in the housing, a loading and unloading pipe (USSR Author's Certificate for the Invention No. 671839, В02С 13 / 14, publ. 07/05/1979).

The disadvantages of the known design is the low efficiency of the grinding process and low fineness. The closest technical solution to the proposed one adopted as a prototype is a centrifugal disk chopper (RF Patent for Utility Model No. 145376, B02C 13/20, publ. 09/20/2014), containing a cylindrical body with loading and unloading nozzles, opposite rotating upper and lower disks with percussion elements, percussion elements are made in the form of a spiral, which are directed in opposite directions on the upper and lower disks.

The following features of the prototype coincide with the essential features of the claimed invention: a cylindrical body with loading and unloading nozzles and oppositely rotating upper and lower disks with percussion elements, percussion elements are made in the form of a spiral, which are directed in opposite directions on the upper and lower disks.

However, this device is characterized by low efficiency of the grinding process. This is due to the insufficient number of particle collisions and insignificant abrasion and crushing loads on the crushed material.

The invention is aimed at improving the efficiency of the grinding process by increasing the number of particle collisions and increasing abrasion and crushing loads on the material being ground.

This is achieved by the fact that the centrifugal disk grinder contains a cylindrical body with loading and unloading nozzles, oppositely rotating upper and lower disks with shock elements in the form of a spiral, which are directed in opposite directions on the upper and lower disks. In the proposed solution, each of the disks includes a conical part with an angle of inclination of the generatrix to the horizon exceeding the angle of repose of the material, to which the horizontal peripheral ring is rigidly attached. The gap between the conical parts of the upper and lower disks is (2 ... 5) D _max , where D _max is the maximum particle size of the starting material. The gap between the horizontal peripheral rings of the upper and lower disks is (1 ... 5) d _max , where d _max is the maximum particle size of the finished product. The top of the conical part of the lower disk is a blade spreader.

The invention is illustrated in the drawing, where in FIG. 1 shows a longitudinal section AA in FIG. 2 (centrifugal disk chopper); in FIG. 2 - section BB in FIG. 1 (cross section of the grinding chamber); in FIG. 3 is a section BB of FIG. 1 (cross section of the grinding chamber).

The centrifugal disk grinder contains a cylindrical body 1 with loading 2 and unloading 3 nozzles, oppositely rotating upper 4 and lower 5 disks with shock elements in the form of a spiral 6. Spiral 6 on the upper 4 and lower 5 disks are directed in opposite directions. The upper 4 and lower 5 discs include conical parts 7, respectively, with an angle of inclination of the generatrix to the horizon exceeding the angle of repose of the material. A horizontal peripheral ring 8 is rigidly attached to each conical part 7, for example by welding. The gap between the conical parts 7 of the upper 4 and lower 5 disks is (2 ... 5) D _max , where D _max is the maximum particle size of the starting material. The gap between the horizontal peripheral rings 8 of the upper 4 and lower 5 disks is (1 ... 5) d _max , where d _max is the maximum particle size of the finished product. The top of the conical part 7 of the lower 5 disk is a blade spreader 9.

The installation of the conical parts 7 of the upper 4 and lower 5 discs with an angle of inclination of the generatrix to the horizon exceeding the angle of repose of the material provides an increase in the speed of passage of the material flow in the working space between the shock elements in the form of spirals 6 and an increase in the intensity of their impact on the material. The installation of horizontal peripheral rings 8 of the upper 4 and lower 5 disks, rigidly, for example, by welding, attached to the corresponding conical parts 7 and rotating in opposite directions, on the working surfaces of which are rigidly fixed, for example, by welding, shock elements in the form of spirals 6 are fixed, which allows increasing the number of particle interactions material between itself and the shock elements, crushing force and to increase the effect of destruction of the material from the action of abrasive forces due to an increase in the concentration of q material in the gap between the horizontal peripheral rings 8. To ensure the necessary capacity of the gap between the horizontal peripheral rings 8 of its total cross-sectional area should be less than the total cross-sectional area of the gap between the conical portions 7 of the upper 4 and lower 5 drive.

Centrifugal disk grinder operates as follows. The crushed material, for example limestone with a humidity of up to 4%, enters the loading pipe 2, to which the upper 4 disk is attached, then it is sent to the blade spreader 9 and, under the action of centrifugal forces, is sent to the working space between the conical parts 7 of the upper 4 and lower 5 disks, where partial grinding occurs. Further, the material enters the working space between the horizontal peripheral rings 8 belonging respectively to the upper 4 and lower 5 disks. This increases the concentration of particles and additional grinding of particles occurs in the gap between the shock elements in the form of spirals 6 of the horizontal peripheral rings 8 of the upper 4 and lower 5 disks. Here there are loads on the crushed material associated with abrasive and crushing forces created by oppositely rotating shock elements in the form of spirals 6 directed in opposite directions. The finished product flies out of the housing 1 through the discharge pipe 3. With a high speed counter rotation of the conical parts 7 of the upper 4 and lower 5 disks, a pressure arises between the shock elements in the form of spirals 6, which increases in the gap between the shock elements in the form of spirals 6 of the horizontal peripheral rings 8 of the upper 4 and lower 5 disks, which provides an increase in the efficiency of the process of grinding material before it enters the discharge pipe 3. The design of the centrifugal disk grinder with the opposite rotating conical parts 7 and horizontal peripheral rings 8, respectively, on the upper and lower surfaces of which the shock elements are rigidly fixed in the form of spirals 6 directed in opposite directions, allows you to increase the number of interactions of the particles of material between themselves and the shock elements, crushing force and increase the fracture effect material from the action of abrasive forces.

All of the above will improve the efficiency of the grinding process and increase productivity in the finished class of crushed material.

Claims (1)

A centrifugal disk shredder comprising a cylindrical body with loading and unloading nozzles, oppositely rotating upper and lower disks with impact elements in the form of a spiral, which are directed in opposite directions on the upper and lower disks, characterized in that each of the disks includes a conical part with an angle of inclination forming to the horizon, exceeding the angle of repose of the material, to which the horizontal peripheral ring is rigidly attached, and the gap between the conical parts of the upper and lower discs is equal to (2 ... 5) D _max, wherein D _max - the maximum size of the starting material particles, and the gap between the horizontal peripheral rings of the upper and lower discs is (1 ... 5) d _max, where d _max - the maximum size of the finished product particle , and the top of the conical part of the lower disk is a blade spreader.

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