BG66577B1 - A milling body - Google Patents

Abstract

The invention is related to a milling body for crushing small and milling ores, rock and earth masses, inert, and all sorts of other materials in drum type, and other mills. It is used for ore enriching, in the production of building materials, and in other industrial branches. The milling body has the form of a spherical tetrahedron, or similar to that, with six edges (3), four vertices (4), and four semi-spherical sides (2). The six edges (3) usually are with a same circular length, but may be executed as variants, where the arcs of three of the edges (3) coming out from the same vertex (4) are with equal lengths, but differ from the lengths of the other three edges (3), the arcs of which are also equally long between themselves. The edges (3) of the tetrahedrons may be arcs of other geometrical curves, e.g. arcs of parabola, spiral, or others. In another variant, for the sake of better manufacturing producibility, e.g. by casting, at least on one side of the milling body there is a spot (1), which may be flat, or rounded off, more or less convex, or concave. Upon one of the sides (2) of the body may be formed a short cylinder (5) with flat face (6). In another variant, through three of the vertices (4), and on three of the sides (2) are formed circumferentially parts of a cylinder (9). In some other variant, at least one of the tetrahedron's vertices (10) is flatly bevelled with a plane perpendicular, or inclined to the axis of the body. In one more variant, the bevelled vertex is rounded off, and is more or less concave. In a next variant, upon the bevelled vertex (10) is raised a short cylinder, or a short prism with flat faces. Another variant has through three of the vertices, and along three of the sides, a roundabout ring with a cross section having a form close to circle, triangle, or rectangle. All body's edges and vertices may be as well rounded off.

Description

Field of technology

The invention relates to a grinding body for crushing and grinding ores, rock or earth masses, inert and any other materials in drum and other mills. It is used in ore beneficiation, in the production of construction materials, coal dust production, waste processing and in other industries.

BACKGROUND OF THE INVENTION

The widely used grinding body for ball-shaped drum mills is known. Disadvantages of spherical grinding bodies are their low productivity, slow breaking of larger particles of materials due to lack of edges and insufficient sealing of the working space of the mills.

A cube-shaped grinding body is also known [US 1431475/1920], which has not found application due to its non-technological form for mass production, and the experiments conducted for grinding with the help of similar cube-shaped grinding bodies have shown by -poor production results compared to spherical grinding bodies (Norris GS, Some Grinding Tests with Spheres and Other Shapes, Trans. Inst. Min. Metal, London, Feb. 1954,63 (567), pp. 197-209 ).

Grinding bodies in the form of tetrahedra, with smooth or rounded sides, are also known, [DE 440 198/1927, FR 811 408/1937, SU 1 388 088/1985, RU 2 305 597/2005], which have the disadvantage of being non-technological. for mass production and therefore have not yet found practical application.

A grinding body is also known [WO 2010/094091 (26.08.2010)], (registered utility model BG 1359), which is tetrahedral in shape and overcomes the non-technological nature of the upper bodies. The exposed grinding body is in the form of a spheroidal tetrahedron obtained by the intersection of four spheres with equal radii, the centers of each of which lie on the surface of the others and are vertices of a regular tetrahedron, and the radii of the spheres are equal to the edge of a regular tetrahedron. at least one vertex of the spheroidal tetrahedron is flat and the others are rounded, so that the amount of material removed from each vertex is the same. The described spheroidal tetrahedron has arcuate edges of equal length and spherical sides.

Because all the tips of this body are chamfered or rounded, the crushing of the materials into small particles takes longer, which reduces the grinding efficiency.

Technical essence of the invention

The problem is solved by creating a grinding body that has the shape of a spheroidal tetrahedron. This grinding body has six edges, four vertices and four hemispherical sides. The six edges of tetrahedra are arcs of a circle of equal length. The centers of the radii of the arcs at the edges of the tetrahedron can be located outside its vertices. At least on one side of the tetrahedron is formed a flat section, which may have a circular shape.

A flat section or cylinder with a flat base is formed on the surface of the grinding body and / or a circumferential ring is formed through three of the tips and through three of the sides.

In other embodiments, the flat portion is convex or concave rounded relative to the side of the tetrahedron on which it is formed.

In another embodiment, a cylindrical ring is formed circumferentially through three of the tops of the tetrahedron and through three of the sides.

In another embodiment, the at least one vertex of the tetrahedron is planarly inclined with a plane that is perpendicular or inclined to the axis of the tetrahedron, which passes through the vertex before the bevel and through the center of the tetrahedron, where a flat section is formed.

In another embodiment, the beveled tip is more or less concave - rounded in the beveled part.

In another embodiment, a short cylinder or short prism is erected on the beveled tip, which has a cross-section close to a triangle and both have flat foreheads.

In another embodiment, a circumferential ring is formed through three of the vertices of the tetrahedron and through three of the sides, having a cross section close to a circle, the ring being convex with respect to the sides and edges of the tetrahedron. In another embodiment, the circumferential ring has a cross section close to a triangle and is convex. In another embodiment, the circumferential ring has a cross section close to a rectangle and is convex.

The edges and vertices of the described variants of grinding bodies in a shape close to a spheroidal3

66577 B1 tetrahedra can also be rounded, and the rounding can be part of a circle or a spiral.

The offered grinding body can be produced from a variety of materials, such as metals, ceramics, glass and others, and for its production are suitable the most commonly used technologies for mass production of such products.

The main advantage of the proposed grinding body according to the invention is its manufacturability, which allows its mass production without any problems by the most commonly used for such products technologies such as casting, stamping, rolling and others. Another advantage over the known grinding body from WO 2010/094091 is the higher productivity due to the presence of more edges and sharp tips, which even beveled or rounded help to break up the larger particles of the ground materials faster. In addition, the geometry of this body provides a larger contact surface both between the individual bodies and between the bodies and the walls of the mills. Also, the surrounding surface of the proposed grinding body is larger than that of a spherical grinding body and of WO 2010/094091 at the same volumes and masses, which also leads to higher grinding productivity compared to the spherical grinding bodies used so far.

Explanation of the attached figures

The invention is explained in more detail with exemplary embodiments of grinding bodies shown in the attached figures, where:

Figure 1 is a front view of a grinding body with a flat section on the lower wall;

Figure 2 is a plan view of a grinding body of Figure 1;

Figure 3 is a front view of a grinding body with a flat base cylinder;

Figure 4 is a front view of a grinding body with a convex flat section;

Figure 5 is a front view of a grinding body with a concave flat section;

Figure 6 is a front view of a grinding body with a circular ring with a cylindrical shape;

Figure 7 is a front view of a grinding body with a flat section on a beveled tip;

Figure 8 is a front view of a grinding body with a concave flat bevelled tip;

Figure 9 is a front view of a grinding body with a flat beveled tip and a circumferential ring with a cross-sectional shape;

Figure 10 is a section along AA of Figure 9;

figure lie front view of a grinding body with a flat beveled tip and a circumferential ring, with a cross-sectional shape close to a triangle;

Figure 12 is a section along B-B of Figure 11;

Figure 13 is a front view of a grinding body with a flat beveled tip and a circumferential ring with a cross-sectional shape close to a rectangle;

Figure 14 is a CC section of Figure 13.

Examples of the invention

An embodiment of a grinding body according to the invention shown in Figures 1 and 2 is a grinding body in the form of a spheroidal tetrahedron having edges 3 forming part of a circle, spherical sides 2, vertices 4 and a flat section 1 formed on the lower side 2 of the the grinding body. In a particular case of this embodiment shown in Figure 4, the flat section 7 is circular in shape and convex with respect to the side 2. In another particular case of this embodiment shown in Figure 5, the flat section 8 is circular in shape and is concave to the side 2.

Another embodiment of a grinding body according to the invention shown in Figure 3 is a spheroidal tetrahedron-shaped grinding body having edges 3, spherical sides 2, tips 4 and a flat base cylinder 5 formed on the lower side 2 of the grinding body.

Another embodiment of a grinding body according to the invention shown in Figure 6 is a grinding body in the form of a spheroidal tetrahedron having edges 3, sides 2, vertices 4. A convex shape is formed through three of the vertices 4 and through three of the sides 2 of the grinding body. circular ring 9 with a cylindrical shape.

Another embodiment of a grinding body according to the invention shown in Figure 7 is a spheroidal tetrahedron-shaped grinding body having edges 3, sides 2, vertices 4, wherein the flat portion 10 is formed, one of the vertices 4 being flatly beveled with a plane that is perpendicular or inclined to the axis of the tetrahedron. In the particular case of this embodiment shown in

66577 Bl figure 8, the flat beveled tip lie concave.

Another embodiment of a flat section grinding body 10 obtained by chamfering the tip 4 shown in FIG. 9 is a grinding body in the shape of a spheroidal tetrahedron, wherein the circumferential ring 12 has a cross-sectional shape. In further embodiments of a grinding body with a flat section 10 obtained by chamfering the tip 4 shown in Figures 11, 12, 13 and 14, the circumferential ring 13 and 14 has a cross-section in a shape close to a triangle or a rectangle, respectively.

The grinding body variants of Figures 1 and 3 are most suitable for production by casting. The grinding body variants of Figures 4, 5, 6, 7 and 8 are suitable for production by stamping presses and hammers. The variants of figures 9, 11 and 13 are most suitable for mass production with the help of forging and pressing machines.

Other technologies for making the grinding bodies shown in the figures are also possible, for example by rolling and the like.

The above examples do not exhaust the possible options for technical implementation of the grinding body.

Claims (12)

Patent claims A grinding body in the form of a spheroidal tetrahedron with spherical sides (2), vertices (4) and arcuate edges (3), the lengths of the arcs of the edges (3) extending from one vertex (4) being the same as the arcs of the others three edges (3) and are parts of a circle, characterized in that at least one flat section (1,10) or a cylinder (5) with a flat base (6) is formed on the surface of the grinding body and / or in three of the tops (4) and a circumferential ring is formed through three of the sides (2) (9,12,13 and 14). Grinding body according to claim 1, characterized in that the centers of the radii of the arcs of the edges (3) are located outside the tips (4) of the body. Grinding body according to claims 1 and 2, characterized in that the flat section (1) is formed on one of the sides (2). Grinding body according to claim 3, characterized in that the flat section (1) has a circular shape. Grinding body according to claims 1 to 4, characterized in that the flat section (1) is convex or concave in relation to the side (2) on which it is located. Grinding body according to claims 1 and 2, characterized in that the circumferential ring (9) has a cylindrical shape. Grinding body according to claims 1 and 2, characterized in that the flat section (10) is formed by a flat bevel of one of the tips (4) with a plane perpendicular to or inclined with respect to the axis of the body. Grinding body according to claim 7, characterized in that the flat portion (10) of the body is concave. Grinding body according to Claim 7, characterized in that the circumferential ring (12) is convex and has a cross-sectional shape close to a circle. Grinding body according to claim 7, characterized in that the circumferential ring (13) is convex and has a cross-sectional shape close to a triangle. Grinding body according to claim 7, characterized in that the circumferential ring (14) is convex and has a cross-section in a shape close to a rectangle. Grinding body according to claims 1 to 10, characterized in that all the edges (3) and the tips (4) of the body are rounded in part by a circle or a spiral.