RU2162368C1 - Lining of drum mill body - Google Patents

Abstract

FIELD: disintegration of solid materials in drum mills. SUBSTANCE: lining includes set of lining plates of elastic material arranged on inner surface of drum body in lengthwise direction in such a way that central portion of drum body is lined with alternating grooved and flat plates. Arc-shaped plates of end portions of drum body are curved with predetermined radius. Plates are deformed for forming symmetrical or asymmetrical profile in central and end portions of drum mill body. In other variant central portion of drum mill body is lined with arc -shaped symmetrical or asymmetrical plates bent with predetermined radius. Plates may be bent in direction of drum mill rotation or in opposite direction, or they may be bent one towards another. Length of arc-shaped plates may be equal to 2-3 length values of above mentioned plates. EFFECT: enhanced efficiency of drum mills. 6 cl, 8 dwg

Description

 The invention relates to the field of grinding of solid materials and can be used in the mining, coal and cement industries.

 Known lining of a ball tube mill, containing rings located along the mill body, each of which consists of a set of spiral armor plates, and the angle of inclination of the spiral changes along the drum of the mill when one row of rings goes to another [1].

 The disadvantage of this technical solution is the wide range of spiral armor with an individual inclination of the wave spiral, and the gradually increasing angle of inclination of the wave-like protrusions from the loading to the unloading part of the mill facilitates the elevator intensive movement and removal of large balls through the discharge neck of the mill, and the increase in the speed of advancement of the crushed material in the mill reduces specific mill productivity for a given size class.

 The closest in technical essence of the invention is the lining of the housing of the drum mill, containing a set of lining plates of elastic material mounted on the inner surface of the housing of the drum in its longitudinal direction [2].

 The disadvantage of this design is the difficulty of manufacturing the lining during the vulcanization of plastic inserts, low reliability of regulation and maintaining the pressure of the working agent in the rubber sleeve of the lining during its operation, which results in low productivity of drum mills.

 The objective of the invention is to increase the grinding performance of drum mills.

 This task is achieved by the fact that in the lining of the drum mill body containing a set of lining plates made of elastic material mounted on the inner surface of the drum body in its longitudinal direction, the central part of the drum body is lined with alternating channels of a grooved and flat shape, and the arcuate plates of the end parts of the body are curved with a radius of at least 3L, where L is the width of the plate, while the plates are deformed with the formation of a respectively symmetric or asymmetric profile in neutral and end parts of the mill body.

 This problem is also achieved by the fact that in the lining of the drum mill body containing a set of lining plates of elastic material mounted on the inner surface of the drum body in the longitudinal direction, the central part of the body is lined with arcuate plates curved at a radius of at least 3L, where L is the width of the plate, with the formation of a respectively symmetric or asymmetric profile in the central part of the mill body.

 Arcuate slabs of the end and central parts of the drum body can be bent in the direction of its rotation.

 Arcuate slabs of the end and central parts of the drum body can be bent towards its rotation.

 Arcuate plates of the end and central parts of the drum body can be counter curved relative to each other.

 The length of each arcuate slab of a symmetric or asymmetric profile can be 3L or 2L.

In FIG. 1 shows a general view of the lining;
in FIG. 2 - the same (option);
in FIG. 3 - the same (option);
in FIG. 4 - the same (option);
in FIG. 5 is a section along BB in FIG. 1 or 2;
in FIG. 6 is a section along AA in FIG. 1 or 2;
in FIG. 7 - asymmetric arcuate plate;
in FIG. 8 - symmetric arcuate plate.

The lining of the drum mill body contains a set of lining plates of elastic material mounted on the inner surface of the drum body in the longitudinal direction. From the loading and unloading part of the mill, the drum is lined with arcuate plates 1 and 2, which have a radius of curvature R _T and are laid on the surface of the mill body according to a scheme with a parallel and equally directed vector of radius of curvature R _T or a parallel and oppositely directed vector of radius of curvature R _T. The central part of the drum body is lined with alternating rectilinear plates of a grooved 3 and a flat 4 shape. Rectilinear plates are fixed to the mill body (not shown).

 The arched lining plates 1 and 2 are made of an elastic material, for example, wear-resistant rubber. Plates can be multilayer: the top - the working layer is made of rubber, and the inner layer is reinforced with cord or metal cord. Arcuate slabs are initially attached with a groove profile, which during installation and fastening (not shown) on the drum body 5 is deformed, repeating the profile of the mill drum body. In the process of pressing and deformation, the working layer of the plate is compressed and compacted. In cross section, arcuate slabs 1 and 2 have a symmetric or asymmetric profile with an offset crest 6 relative to the middle part. A number of figured recesses 7 can be made along the crest part 6. The crest part of the plates is located on the side of the upper working layer of the arcuate lining plates and in the pressed working state is connected with the flat part of the adjacent arcuate plate.

Symmetric arcuate slabs in working condition have a width L, a multiple of which is stacked along the cylindrical part of the drum body. It was experimentally established that the optimal length of the arcuate slabs is 2L or 3L for mills of various sizes, and the radius of curvature of the arcuate slabs is equal to R _T = 3L. For symmetric arcuate plates, the centers of radius of curvature R _T are shifted to one of the sides of the plates and are located on the axis O ₁ -O ₁ , conditionally parallel to the axis of symmetry OO. The axis O ₁ -O ₁ is located at a distance d from the side of the plate, the value of which varies from O to L, depending on the size of the mills. Arcuate slabs 1 of a symmetrical profile or asymmetric profile 2 are curved along the radius of curvature R _T from the side of the crest and gently sloping parts. Due to the fact that the arcuate profile of the plates is curved along the radius of curvature R _T from the side of the crest and gently sloping parts, the plates fit tightly on the drum casing and adjoin each other during pressing without gaps. Due to the fact that the width of the plates L is a multiple of the perimeter of the cylindrical part of the drum, the arcuate plates densely lining the entire mill body. After pressing the plates wedge each other.

 The rectilinear plates 3 and 4 of the central part of the drum casing are made of multilayer ones - the outer layer is made of wear-resistant rubber, the bottom layer is reinforced with synthetic cord or metal cord, during pressing the grooved rectangular plates 3 are deformed on the drum casing, increasing both in width and length due to the elastic material plates. In the working pressed state, the straight plates 3 acquire a trapezoidal section of a symmetrical or asymmetric shape with ridges 8. When broadening, the grooved plates 3 wedge the straight lining plates 4 on the sides and fit tightly without gaps to prevent the abrasive pulp from penetrating the metal drum body.

 When lengthening, the grooved plates 3 tightly without gaps wedge the arcuate plates 1 and 2 of a symmetrical or asymmetric shape along the line of their conjugation.

When lining the mill body from the side of its loading and unloading parts with symmetrical plates (Fig. 1), the vector of radius of curvature R _{T of the} plates of the mill part has a parallel and opposite direction. The direction of rotation of the ball mill has a parallel and opposite direction. The direction of rotation of the ball mill along the arrow W coincides with the direction of the vector of radius of curvature R _T in the loading part (Fig. 1). When lining the surface of the housing 5 of the mill with symmetrical arcuate plates 1 (Fig.3), the vector of radius of curvature R _{T of} all plates has a parallel and the same direction. The direction of rotation of the ball mill when grinding solid material (in the direction of arrow W) is opposite to the curvature vector R _T. When ore-pebble grinding of solid material, the direction of rotation of the mill (along arrow C) coincides with the direction of the vector of radius of curvature R _T. When the lining of the mill body with symmetric and asymmetric plates, the curvature vector R _T may have an opposite direction, while the plates are counter curved relative to each other (figure 4).

 The technical device operates as follows.

 Depending on a particular type of ball and ore-pebble mill, a lining of the drum mill body is formed. Curved plates of symmetric 1 or asymmetric 2 shape are laid on the mill body 5 from the loading and unloading sides or throughout the mill body, in the central part of the body straight grooved plates 3 and flat lining plates 4 are installed. Lining plates are pressed against the mill drum body.

In the indicated specific embodiment of the technical solution (FIG. 2), the direction of the vector of radius of curvature R _{T of the} arcuate plates is determined by the rotation of one or another type of mills. For ball mills, the rotation of the drum casing (along arrow W) coincides with the direction of the radius of curvature vector R _T , and for ore-pebble grinding mills, the direction of rotation (along arrow C) is opposite to the direction of the curvature radius vector R _T.

 The intramill mill volume is filled with balls 9 in ball grinding mills or ore galei 10 in self-grinding mills. The mill is driven into rotation, the solid material is subjected to grinding.

 In the process of grinding solid material, curved (arcuate) symmetric and asymmetric lining plates provide conditions for the transverse displacement of large balls and ore gallium along the longitudinal axis of the mills relative to the direction of rotation of the mill drum body.

When the ball mill rotates, the balls 9 perform an elementary movement of w ^* along the rotation of the mill. At the same time, due to the arcuate profile of the plates with the radius of curvature R _{T, the} balls perform an elementary movement s along the crest part 6 of the arcuate plates in the direction of the position of the energetically favorable state, i.e. (in the case of FIG. 2) from the loading and unloading part of the mill to the interface line of arcuate and rectilinear lining plates to the central, most effective zone for grinding solid material. Large balls are displaced along the crest of the plates with sliding, while doing additional work on grinding solid material. At the same time, the pressure on the end caps of the mills is reduced. Small balls, the size of which is comparable with the width of the recesses 7, grind the material both in these recesses and on the gentle part of the arcuate plates. Capture and directional displacement of balls into the central part of the mill reduce the likelihood of balls being removed through the discharge neck for mills with central discharge. In the central part of the mill, lined with rectilinear grooved plates with ridges in combination with flat-shaped plates, the solid material is subjected to intensive grinding in the cascade or waterfall mode of the ore-ball (ore-pebble) mixture.

For ore-pebble mills, it is very important to isolate gal of a certain size for use in subsequent grinding cycles. In this case (Fig. 2) the rotation of the mill can be directed towards the curvature vector of the arcuate slabs. When the ore-pebble mill rotates, the gal 10, making an elementary movement c ^* along the rotation path of the mill, is shifted by an elementary amount of displacement s ₁ towards the discharge part of the mill. Selecting a certain radius of curvature and the length of the arcuate slabs, comparing the rotation speed of the mill with the magnitude of the longitudinal movement, a certain amount of ore gali of a given size is isolated.

 Depending on the requirements of the technology of grinding solid materials to obtain a coarse, thin or ultrafine grinding product, one or another set of lining plates for drum mills is selected (Figs. 1,2,3 and 4).

 The inventive technical device allows, due to the longitudinal and transverse movement of crushing bodies, to intensify the process of disintegration of solid material in drum mills of processing plants, to increase the productivity of mill systems and the efficiency of the grinding process, to increase the mechanical reliability and performance of drum mills.

Sources of information
1.SU 795561 A, 1/15/1981.

 2. RU 2129468 C1, 04/27/1999.

Claims (6)

 1. The lining of the housing of the drum mill, containing a set of lining plates of elastic material mounted on the inner surface of the drum body in its longitudinal direction, characterized in that the Central part of the drum body is lined with alternating plates of a grooved and flat shape, and the arcuate plates of the end parts of the body are curved a radius of at least 3L, where L is the width of the plate, while the plates are deformed with the formation of a respectively symmetric or asymmetric profile in the central and evy parts of the mill body.  2. The lining of the housing of the drum mill, containing a set of lining plates of elastic material mounted on the inner surface of the drum body in the longitudinal direction, characterized in that the central part of the body is lined with arcuate plates curved at a radius of at least 3L, where L - the width of the plate, with the formation of a respectively symmetric or asymmetric profile in the central part of the mill body.  3. Lining according to claim 1 or 2, characterized in that the arcuate plates of the end and central parts of the drum body are curved in the direction of its rotation.  4. Lining according to claim 1 or 2, characterized in that the arcuate slabs of the end and central parts of the drum body are bent towards its rotation.  5. Lining according to claim 1 or 2, characterized in that the arcuate plates of the end and central parts of the drum body are counter curved relative to each other.  6. Lining according to claim 1 or 2, characterized in that the length of each arcuate plate of a symmetric or asymmetric profile is 3L or 2L.

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