SU1138006A3 - Tumbling barrel - Google Patents

Abstract

1. DRUM MILL, containing a cylindrical body in which a closed loop is formed; lined plates in coaxial rings, a working chamber having an internal surface in cross section in the form of a polygon with rounded corners, differing in that, in order to increase the uniformity of wear of the plates and increase the durability of the lining, the inner surface of each lining ring is filled with curvature close to an ellipse arc, and with a radius of curvature greater than the radius of rounding of the corner sections, while spacer bars are mounted between the lining plates and the case on the corner sections DKI. fPus. one

Description

2. The mill according to claim 1, characterized by the fact that each spacer gasket is made of trapezoidal shape in cross section. 3. The mill according to claim 1, characterized in that each spacer is made in the form of a hollow beam with the possibility of resting at least two lining plates on it. 4. The mill according to claim 1, that the surface 06 of the support of the lining plates of the spacer gasket is made in a curvilinear form that repeats the curvature of the inner surface of the lining ring 5. The mill according to claim 1, characterized in that the spacer gaskets are made on the side surfaces with radial ribs, adjacent to which between the labyrinth seal.

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The invention relates to the grinding of solid materials in drum mills and can be used in the construction of materials, chemical and other areas, from a massive scale.

There is a well-known drum mill in which the working chamber is equipped with a lining of individual armor plates of a trapezoidal profile laid in ring sections with lifting elements on the working surface in the form of protrusions. Each annular section in the longitudinal section of the mill forms a passage in the shape of a truncated cone, facing a wide base to the loading end ij.

However, in a mill having such a lining, due to an increase in the rate of advancement of the material, it is difficult to obtain a product of high dispersion.

The closest in technical essence to the invention is a drum mill comprising a cylindrical body in which a working chamber formed in a coaxially lined plate with a inner surface j with a cross section in the form of a polygon with rounded corners 21 is formed.

However, in this mill, the force applied to the grinding bodies in the corners (in cross section) of the working chamber is insufficient for effective grinding of the material. A decrease in the radius of curvature at the corners reduces the volume of the working in comparison with conventional working chambers of circular cross section and, in extreme cases, the overall productivity of the mill can significantly

5 decrease. In addition, a consequence of the reduced radius of curvature in the corners is the need to use higher gaskets when installing the lining plates and the fasteners associated with them should be longer. Another disadvantage is considerable wear due to the strong slippage of the grinding bodies along the smooth lining, which is particularly strong at the transition point between the bottom end of the rounded corners and the right side of the square, due to interruption of the radial acceleration here.

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The purpose of the invention is to improve the uniformity of the plates and increase the durability of the lining.

This goal is achieved by

5 | that in a drum mill containing a cylindrical body, in which a working chamber formed by the lining plates closed in coaxial rings is formed;

0 the surface in cross-section is in the form of a polygon with rounded corners, the inner surface of each lining ring is made with a curvature close to the arc of the ellipse,

5 and with a radius of curvature greater than the radius of rounding of the corner sections, spacers are mounted between the lining plates and the housing in the corner sections.

Each spacer is trapezoidal in cross-section.

In this case, each spacer is made in the form of a hollow beam with the possibility of supporting at least two-lining plates on it.

The surface of the lining plates of the spacer gasket is made up of a curved shape that repeats the curvature of the inner surface of the lining ring.

Spacers are made on the side surfaces with radial ribs, adjacent of which form between themselves a labyrinth seal.

Despite the boltless fastening of each individual lining plate, when the latter is destroyed, only the corresponding plate or a limited number of plates must be replaced. The arrangement of the plates does not depend on the bolt holes in the mill body, and thus the number of lining plates is reduced.

FIG. 1 shows a drum mill chamber; in fig. 2 shows section A-A in FIG. 1, increased scale; in fig. 3 - another part of the drum mill, equipped with lining plates with single and double wavy elements; in fig. 4 - lining plate, enlarged; FIG. 5 is a section BB in FIG. 3; in fig. 6 - the same, with the use of lining plates with an inclined surface; in fig. 7 is a diagram with a kinematic analysis of working chambers with different cross sections.

The cylindrical tubular drum 1 is provided from the inside with a lining bounding a crushing chamber of a polygonal shape, in particular a quadrangular or hexagonal shape. The lining consists of a series of individual lining rings 2 and 3, each of which consists of lining plates 4 and 5.

FIG. Figure 1 shows one eighth of the cross sectional area of the crushing chamber. The lining plates 4 and 5 form a working chamber of a polygonal cross section with rounded corners and curved sides. For this reason, the lining plates 5, attached directly to the drum by means of bolts 6, contain a crushing surface 7 preferably of an elliptical shape, whereas the lining plates 4 have the shape of cylinder segments, when viewed in the axial direction, and preferably a flat crushing surface and fixed to the drum by laying 8 between the lining plate and the drum.

The gasket 8 on each side of the polygon consists of a plurality of hollow bodies. The lining plates 4 are inclined relative to each other so that the crushing surfaces form a cross-section line in cross section, approximating the shape of the arc of an ellipse. The size of each body is such that at least two lining plates 4 can be attached to it by means of elastic coating 9 (Figures 1 and 2) or bolts 6. The advantage is that any body and any lining plate 4 can be replaced by separately without the need for unloading the mill. The fixing bolts 6 pass through the hollow bodies in the tubes 10 welded to the latter. Gasket 8 is a hollow body enclosed on all sides. For external soundproofing, corrosion protection of the inner surface of hollow bodies can be filled with foam material. The contact between the lining plate and its support can be improved by installing an intermediate elastic layer 11. The side edges of the hollow bodies are covered with edges of 12 lining plates 4 to prevent wear of these parts of the gasket 8 These edges also serve as guides to facilitate the installation of the lining plate, I

The lining plates 5, located in the fillets of the corners of the cross-sectional area of the working chamber, are held due to the structures of the arched vault between two successive gaskets using wedges 13 inside the drum. These two plates 5 can be supported on a hardened coating 2 and retained by means of a ring then mounted on the drum in a known manner.

The gasket 8 is attached to the drum by means of bolts 6. Holes for bolts of JOTOT tube that extend to the upper plates 14, into which it is possible to install, for example, a central bushing, Dp fitting the dam 8 to the cross-sectional area of the crushing, the upper plate 14 contains limbs 15,. simplifying the plate transfer, especially in the fillet of the cross section of the angle. The profile of the crusher plate 16 is wavy .. In the plate 14, the cam grooves 17 are made on both sides facing the edges 12. There is a small gap between the plate 14 and the plate 5 where the coating 9, for example vulcanized synthetic, spreads during pressing of the plate resin. The hardening resin, in combination with the cam grooves, forms a solid and solid support for the lining plates, and the plates are attached, for example, by means of centering sleeves 18, which prevent radial impacts, so that these impacts cannot be transferred to the coating. To reduce abrasive wear, radial ribs 19 are provided on the sides of the gasket 8. The placement of the radial ribs or footer plates prevents abrasive movements of the comminuted material moving between the gaskets. The rings i and 2 of the linings tightly adjacent to each other form several elements of the lining system superimposed on each other in the axial direction of the drum, each of which is installed with an angular displacement relative to the previous one in the form of steps in the same direction (Fig. 5 and 6). This offset can reach one or more of the peripheral pitch of the bolt holes in the mill drum. The mill can be used for both wet and dry grinding. The wavy profile of the lining plates 4 and 5 in front of the bolts 6 in the direction of rotation of the drum has the advantage that the material is removed from the wavy profile 16 and the lining plate 4 or 5 on the side that attaches to the fastening bolt 6, when the contents of the drum slides back in the direction of the arrow. The abrasive effect of the comminuted material is shown by the dotted line 20 (Fig. 4) of the reproducible worn plate configuration at the moment when the head of the fastening bolt 6 begins to wear. 6 The corrugated elements of the profile 16 are subject to wear mainly on the side facing the content the material sliding back, while the waviness moves as it wears and forms a broadened part around the bolt, i.e. wavy, slows the abrasive wear of the bolts, and the lining plate remains firmly fixed, even if it is worn. In this case, a decrease in the material slip along the lining plates 4 and 5 is achieved, which reduces and makes more uniform the wear of the surfaces of the lining plates and, thus, prolongs their service life. A plurality of hollow bodies can be replaced with a continuous gasket 8, provided that the solid gasket has a curved surface for securing the lining plates, with angles between the plates. Wave profile 16 is directed parallel or across the longitudinal axis of the mill. These plates can be used selectively depending on the desired crushing method. The last described arrangement improves the delamination effect of the medium loaded in the crusher. This eliminates the need for the construction of FIG. 5 or 6. In this case, the lining plates 4 have a cross section of a trapezoidal shape and are fixed with gaskets 8 installed between them and the drum, also of a trapezoidal section. The arrangement of FIG. 6 can be used for a large-diameter fine grinding chamber for cVhom grinding, where precise separation on the grinding elements is required for the most efficient grinding. The waviness, directed across the axis of rotation of the mill, provides the sorting effect of the grinding chaffs. In a drum crusher with round i in the cross section of the working chamber 21 (Fig. 7), the centrifugal force will cause the crushing ball 22 to apply pressure to the lining always in the direction perpendicular to the cross section of the chamber and, thus, lift. The force in the direction of rotation of the drum will be absent. In a drum mill equipped with a polygonal lining with angles rounded in an arc of a circle of 23, only a small lifting force near rounded corners will affect crushing balls 24 and the balls will fall onto the material to be ground after a short pause. In this zone 25, the lifting force can be increased only due to the smaller radius of curvature, but this will reduce the volume of the grinding chamber. The lining 26 according to the invention defines the cross section of the crusher surface along the arcs of the ellipses 27 and 28, so that a relatively large lift force acts on the crushing balls 24 near the corners where the ball cuts to the greatest height, which confirms the force pattern. This large lifting force causes a more significant crushing action of the ball in this zone than with both the previously described cross sections. The mining ball, which was raised to a greater height, falls and its impact is stronger, while the volume of the working chamber decreases by the same magnitude as at cross section 23. An image representing mirror symmetry about the center line 21 shows that the crushing ball 22 is exposed to a greater reversing lift force near the corners, and the crushing ball will rise to a lower height. From the foregoing, it can be seen that the angle at which the balls fall, undergoes a more significant change as . cross-section 26, as a result, there is a more significant change in the parabolic trajectories of the fall of the splitting balls and a wider zone of impact in the lower level of the charmer loading of the mill. This results in increased loading turbulence. Thus, the use of the working chamber in the form of a polygonal snail improves the selective grinding of the material passing through it. In addition to improving the grinding selectivity, the linings according to the invention provide an improved wear pattern, since both arcs of the ellipse 27 and 28 form a continuous curve, eliminating the discreteness of radial acceleration, for example, there is an undesirable increased wear at the point of transition from a circular arc to a straight line in the transverse direction. cross-section of the working chamber with rounded corners. This increased wear can be reduced in the chamber. With a cross section of 26 In large-diameter mills, the use of a cross-sectional shape proposed by the invention allows the use of lower shims 8 and shorter bolts 6.

Claims (5)

1. A DRUM MILL, comprising a cylindrical body in which a working chamber is formed, formed by closed in coaxial rings lining plates, having an inner surface in cross section in the form of a polygon with rounded corners ^ characterized in that, in order to increase the uniformity of wear of the plates and increase durability lining, the inner surface of each lining ring is made with a curvature close to the ellipse arc, and with a radius of curvature greater than the radius of curvature of the corner sections, while between lining plates and the housing mounted on the corner portions of the spacer pads. 1138606 2. Mill according to π. 1, with the fact that each spacer gasket is made of trapezoidal shape in cross section. 3. Mill according to π. 1, characterized in that each spacer gasket is made in the form of a hollow beam with the possibility of supporting at least two lining plates on it. 4. Mill pop. 1, with the fact that the abutment surface of the lining plates of the spacer gasket is made in a curved shape, repeating the curvature of the inner surface of the lining ring 5. The mill according to claim 1, characterized in that the spacers are made on the side surfaces with radial ribs, adjacent of which form a labyrinth seal between them.