RU2546184C1 - Tubular mill - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to solid materials crushing means. this mill comprises drum, loading and unloading spindles and drive. Said drum is composed of one and more strips. Said strips are bent in wavy manner at the angle to lengthwise edge flexure lines to make helical surface composed of wavy-shape pockets directed in one side at 10-70 degrees. Pockets shape and sizes over inner surface can differ from those of pockets over drum outer surface and perimeter. Said pockets can differ in shape and sizes.

EFFECT: enhanced performances and higher efficiency.

6 dwg

Description

The invention relates to techniques for grinding solid materials and may find application in the construction, chemical and metallurgical industries.

Known tube mill (AS No. 1349780, class B02C 17/02, 1987) containing loading and unloading pins, a drive and a drum made of interconnected tetrahedral or octahedral elements forming a helical column.

A disadvantage of the known device is the limited technological capabilities, insufficient intensity of grinding and the complexity of manufacturing.

Closest to the proposed invention is a tube mill (patent No. 2277972, class B02C 17/02, 2006) containing loading and unloading pins, a drive and a drum made of at least one strip bent in straight lines placed under angle to the edges of the strip, with the formation of the same parallelograms located on the strip alternately in opposite directions, while the strip is folded into cylindrical coils connected to each other along the longitudinal edges, with the formation on the outer surface of unidirectional lo helical lines, and on the inner surface of helical broken pockets of a triangular shape.

A disadvantage of the known device is the limited technological capabilities and lack of performance

The technical solution is achieved by the fact that in a tube mill containing loading and unloading pins, a drum and a drive, the drum is made of one or more strips, bent in waves along the bend lines placed at an angle to their longitudinal edges, with the formation along the outer and inner surfaces directed into one side at an angle of 10-70 ° of helical surfaces in the form of pockets of a wave-like shape, while the shape and dimensions of the pockets along the inner surface may differ from the shape and dimensions of the pockets along the outer surface and along drum imetru pockets can be different not only in form but also in size.

According to the patent literature not found a technical solution similar to the claimed, which allows to judge about the inventive step of the proposed tube mill.

The novelty lies in the fact that the drum is made of one or more strips, bent in waves along the bend lines placed at an angle to their longitudinal edges, with the formation of screw surfaces along the outer and inner surfaces at one angle at 10-70 ° in the form of inner pockets and the outer surfaces of the wavy shape, while the shape and dimensions of the pockets on the inner surface may differ from the shape and dimensions of the pockets on the outer surface, and around the perimeter of the drum the pockets can be different not only in shape, but also in size, which expands its technological capabilities.

The novelty lies in the fact that due to the internal helical surfaces of the double curvature of the inner surface of the drum, the velocity vectors of the movement of bulk materials change from loading to unloading, which contributes to the intensification of the grinding process and expands technological capabilities.

The novelty is seen in the fact that the drum is made of one or more strips, which simplifies manufacture and expands technological capabilities.

The novelty of the proposal also lies in the fact that inside the drum with a complex inner surface in the form of a combination of two curved surfaces at each point there are multidirectional components of the movement of the crushed materials, which expands the technological capabilities.

The novelty also lies in the fact that with the same diameter of the drum of the known design and the proposed design of the drum, in the proposed design, the scan length of the diameter of the drum along the perimeter due to its waviness along the perimeter is much larger, therefore, the path of the particles of the crushed materials compared to known drum designs are much larger, which expands technological capabilities.

The novelty is due to the fact that the shape and dimensions of pockets on the inner surface may differ from the shape and dimensions of pockets on the outer surface, which expands the technological capabilities.

The novelty is that the pockets around the perimeter of the drum can be different not only in shape but also in size, which expands the technological capabilities.

The invention is illustrated by drawings, where in Fig.1 shows a tube mill, General view; figure 2 - drum with pockets wave-shaped, front view; figure 3 is a section A-A in figure 2; figure 4 is a strip with marked straight lines; 5 is a strip bent in a wavy in straight lines; in Fig.6 is a perspective view of a wave-like strip folded into a cylindrical coil.

The tube mill consists (Fig. 1) of drum 1, loading 2 and unloading 3 pins and a drive (not shown).

Drum 1 (Fig. 2, Fig. 3) is made around the perimeter in the form of a multiple-helical surface with helical grooves inside and outside the drum in the form of pockets of a curved shape at an angle of 10-70 ° to the axis of rotation of the drum 1 with the centers of curvature of the pockets of a curved shape of the screw surface located alternately outside and inside the cross section of the drum 1 (wave-like). The drum 1 (Fig. 1, Fig. 2, Fig. 3) is made of at least one strip 4, bent in a wave-like fashion along fold lines placed at an angle to their longitudinal edges and connected along the longitudinal edges 5 (shown in Fig. 2 by a dash-dot line ) by known methods, for example, by welding, with the formation on the outer and inner surfaces directed to one side at an angle of 10-70º of screw surfaces in the form of pockets of a wavy shape on the outer surface of 6, 7, 8, 9, 10, 11 and pockets of a wavy shape the inner surface 12, 13, 14, 15, 16, 17, which along the perimeter of the drum 1 can be different not only in shape but also in size and size. Strip 4 (figure 4, figure 5) is bent in a wave-like fashion along straight lines 18 located at equal angles α to the edges 5 of strip 4 and placed at a distance L between the fold lines 18. The distance L is equal to the sum of the lengths of the perimeters of the geometric figures of the pockets of the inner and outer wavy surfaces. The strip 4 after a wave-shaped bend (Fig. 5) is folded into cylindrical coils (Fig. 6), connected to each other along the longitudinal edges 5 by known methods into a drum 1.

The tube mill operates as follows.

The drum 1 is filled with balls or other crushing medium and crushed material or one crushed material. When the drum 1 rotates a mixture of grinding media and material or a mixture of particles of different particle sizes, complex spatial motion along helical lines is reported with the material moving along helical lines from loading to unloading. Wavy-shaped pockets capture during the rotation of the drum 1 certain volumes of material, grinding media and, depending on the speed of rotation of the drum 1, pick up certain portions of grinding media and material and throw them on the opposite, located at an angle to them surface of the drum 1, which ensures the movement of portions of the mixture grinding media and material with a large amplitude of motion at different angles to each other and to the walls of the drum, which increases the intensity of mixing and grinding. Therefore, when the drum 1 rotates, there is a cascade movement and intensive mixing with a high energy consumption of grinding media and material, which increases productivity and expands technological capabilities.

Technical and economic advantages arise due to the creation on the surface of the drum of helical pockets of a wave-like shape on the inner surface, which expands the technological capabilities of the tube mill.

Claims (1)

A tube mill containing loading and unloading trunnions, a drum and a drive, characterized in that the drum is made of one or more strips, bent in waves along the bend lines placed at an angle to their longitudinal edges with the formation on the outer and inner surfaces directed to one side at an angle 10-70 ° of helical surfaces in the form of pockets of a wave-like shape, while the shape and dimensions of pockets along the inner surface may differ from the shape and dimensions of pockets along the outer surface and around the perimeter of the drum, pockets Ans can be different not only in shape but also in size.

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