RU2547936C1 - Tubular screw mill - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: mill comprises feed (2), discharge (3) trunnions, a drive and a drum (1). The drum consists of sections. The sections are assembled of two identical subsections. The subsections are composed of even number of at least 4 identical isosceles and 4 identical equilateral triangles. The isosceles triangles are alternately connected with the equilateral triangles along the subsection perimeter to form a small and a large end holes in the form of polygons. Two subsections are connected to each other by the sides of end large holes to form a section. The sections are attached to each other along the drum length by their sides of the small end holes. The connected sections form a multithread screw drum with mutually oriented broken screw lines.

EFFECT: invention expands operating performances due to higher intensity, energy intensity and reorientation of the crushed material particles and crushing bodies.

7 dwg

Description

The invention relates to techniques for grinding solid materials and can find application in the construction, chemical, metallurgical industries, as well as in agricultural production.

Known tube mill (AS USSR No. 713586, class. V02C 17/02, 1978) containing a drum, loading, unloading pins and drive.

A disadvantage of the known device is the limited technological capabilities due to the insufficient intensity of mixing and the speed of movement of the crushed materials from loading to unloading.

Closest to the proposed device is a tube mill (A.S. USSR 1349780, class B02C 17/04, 1987) containing loading, 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 due to the insufficient intensity of mixing and the speed of movement of the crushed materials from loading to unloading.

The technical solution to the problem is to expand technological capabilities by increasing the intensity, energy intensity and reorientation of particles of crushed materials and grinding media.

The technical solution is achieved by the fact that in a tube screw mill containing loading, unloading trunnions, drum and drive, the drum is mounted from sections assembled from two identical subsections made of an even number of at least 4 identical isosceles triangles, alternately connected along the perimeter of the subsection with 4 equal equilateral triangles with the formation of small and large end openings in the form of polygons, while in the section two subsections are connected to each other by the sides of the end large their holes, and the sections are attached to each other along the length of the drum with their sides of the small end holes with the formation of a multi-helical drum with mutually directed broken helical lines.

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 design of a tube screw mill.

The novelty of the invention lies in the fact that such a design of a tube screw mill allows not only the expansion of technological capabilities, but also the compression of the crushed materials as they move from loading to unloading and increase the grinding efficiency.

The novelty is also seen in the fact that the area and shape of the cross and longitudinal sections of the drum of a tube screw mill vary along the entire length from loading to unloading, which changes the speed and trajectory of movement of the crushed materials, expands technological capabilities.

The novelty of the invention lies in the fact that such a structural design of the drum of a tube screw mill allows for sequential gradual compaction and rarefaction of the flows of crushed materials from loading to unloading, which intensifies the process of grinding materials and extends the technological capabilities of a tube screw mill.

The novelty lies in the fact that due to the mutually directed broken helical lines, the vectors of the speed of movement of the crushed materials during transportation from loading to unloading change, which contributes to the intensification of the grinding process and expands technological capabilities.

The novelty also lies in the fact that along the inner perimeter of the drum of a tube screw mill, broken screw surfaces are formed along the length of the drum, which ensures a violation of the stationary flows of the crushed materials inside the drum, increasing the intensity of grinding, expanding technological capabilities.

The novelty is also due to the fact that the area and shape of the cross section of the drum varies from loading to unloading, which changes the speed and trajectory of the movement of the crushed materials as they move from loading to unloading, expanding technological capabilities.

The novelty is due to the fact that the drum is equipped with three, four, five, etc. broken helical lines of the main and opposite directions and, respectively, three, four, five, etc. broken helical grooves of the main and opposite directions inside the drum, which changes not only the speed of movement of the crushed materials from loading to unloading, but also the frequency of interaction of particles of the crushed materials with each other, with grinding media and with the walls of the drum, increases the energy intensity of collisions, productivity and extends technological opportunities.

The invention is illustrated by drawings, where figure 1 shows a tube screw mill, General view; figure 2 - drum, front view; figure 3 is a section bB in figure 2; figure 4 is a view of figure 3; figure 5 is a view of B in figure 4; figure 6 is one of the subsections, a visual image; Fig.7 is an assembly diagram of a section of two subsections, a visual image.

Tube screw mill (figure 1) consists of a screw drum 1, loading 2 and unloading 3 pins.

Drum 1 (figure 2, figure 3, figure 4, figure 5) is mounted from sections 4 mounted from two identical subsections 5 and 6 (figure 6, figure 7).

Subsections are made (for example, subsection 5) from an even number of at least 4 identical isosceles triangles, for example, in Fig. 6 four isosceles triangles 7, alternately connected along the perimeter of the subsection with four identical equilateral triangles, for example (Fig. 6) with four identical equilateral triangles 8 with the formation of a small end hole in the form of a polyhedron 9 and a large end hole in the form of a polygon 10. In section 4, the same subsections 5 and 6 are connected to each other (Fig. 7) by the sides large end holes 10.

The same sections 4 are then connected to each other along the length of the drum 1 by their sides of the small end holes 9 with the formation of a multi-helical screw drum 1 with mutually directed broken helical lines.

For example, in FIG. 2, one of the right broken helical lines is shown in FIG. 2 with a thickened line 11, 12, 13, 14, 15, 16, 18, and one of the left broken helical lines is shown with a thickened line 19, 20, 21, 22, 23, 24, 25, 26. In the drawing, the positions of the invisible points of broken lines are bracketed, for example, 23, 24, 25 and 16, 17, 18.

Broken helical lines form around the perimeter of drum 1 broken helical surfaces consisting of faces in the form of equilateral 8 and isosceles triangles 7.

Helix lines on the outer surface of the drum 1 have the same position designations with their corresponding grooves on the inner surface.

Since subsections 5 and 6 have small end openings 9 and large end openings 10, sections 4 have variable longitudinal and variable flow sections along the length of the drum 1.

The proposed tube screw mill operates as follows.

In the rotating drum 1 through the pin 2 continuously loaded to be crushed materials and grinding media. When the drum 1 is rotated, the materials to be ground and the grinding media move along the helical grooves and are discharged from the drum 1 by means of a pin 3 outside the tube screw mill.

When the drum 1 rotates, the materials to be ground and grinding media are captured by the faces of the inner screw surface and in the direction of rotation rise up and move to the discharge side. Upon reaching a certain height under the influence of gravitational forces and the resulting angle of repose, the materials to be ground and grinding media move towards each other at certain angles and to the walls of the rotating drum 1 and move towards the discharge side. Since the broken inner surface of the drum 1 is continuous, the continuous movement of subsequent portions of the materials to be ground and the grinding media that rise up and fall down move at different angles. Since the inner surface of the drum 1 is mounted from different in shape equilateral and isosceles triangles 7 and 8, which are located at different angles not only to each other, but also to the axis of rotation of the drum 1, each portion of the materials to be ground and grinding bodies move in its own vector directions towards unloading, which significantly intensifies the interaction process of grinding materials and grinding bodies with each other and with the walls of the drum 1, the grinding intensity increases and expands technological opportunity. Since, due to the broken shape of the inner surface of the drum 1, the range of changes in the resulting displacement vectors of the crushed materials and grinding bodies is significantly expanded, each particle of the crushed materials and grinding bodies moves in different direction vectors, which provides a greater probability of collisions at the initial moment of their separation from the walls drum 1, where they have a certain supply of kinetic energy and move with high kinetic energy, therefore, the intensification of the process is finer tions.

The speed of movement of the crushed materials and grinding bodies of the processed parts is regulated by the inclination of the drum 1 relative to the horizon with known means (not shown in the drawing).

Technical and economic advantages arise due to the widening of the range of changes in the resulting displacement vectors of the crushed materials and grinding media, increasing their energy intensity and the intensity of interaction and reorientation, as well as increasing the speed of their movements from loading to unloading, which increases productivity and expands technological capabilities.

Claims (1)

A tube screw mill containing loading, unloading trunnions, a drive and a drum, characterized in that the drum is assembled from sections assembled from two identical subsections made of an even number of at least 4 identical isosceles triangles, alternately connected along the perimeter of the section with 4- with equal equilateral triangles with the formation of small and large end openings in the form of polygons, while in the section two subsections are connected to each other by the sides of the end large openings, and the section are attached to each other along the length of the drum with their sides of small holes to form end multistart screw vzaimonapravlennymi polygonal drum with helical lines.

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