A streamlined wear-resistant liner and mill cylinder

Abstract

The present invention discloses a streamlined wear-resistant liner and a mill cylinder. The streamlined wear-resistant liner includes a liner body, including a liner body, a first transition surface is arranged between a first lifting surface and a first crushing surface, the first transition surface is a first curved surface, and the conductor of the first curved surface is a curved segment of an ellipse or a circle; a second transition surface is arranged between the second lifting surface and the second crushing surface, the second transition surface is a second curved surface, and the conductor of the second curved surface is a curved segment obtained in an ellipse or a circle. The mill cylinder is assembled by assembling the streamlined wear-resistant liner. After contact analysis and stress intensity factor analysis of the V-notch, the lifting surface-crushing surface collision angle adopts an elliptical curved surface transition, which has a lower stress level, and the liner is safer and less prone to cracks. There is a tendency for the crack to open when the broken line transitions, while the cracks in the liner with the arc transition tend to close. Obviously, cracks with a closing trend are not easy to expand.

Description

Technical Field

[0001] The invention belongs to the field of mill equipment and relates to a wear-resistant lining plate for a semi-autogenous mill or an autogenous mill, and a mill cylinder using the wear-resistant lining plate. Background Art

[0002] Autogenous mill is a new type of grinding equipment that has both crushing and grinding functions. It uses the material itself as the medium and achieves crushing through mutual impact and grinding. For semi-autogenous mill, adding a small amount of steel balls to the autogenous mill can increase the processing capacity by 10-30%, but the wear of the liner increases by 15% and the product fineness becomes coarser. The current autogenous mill and semi-autogenous mill have a maximum diameter of 5m to 15m, and the liner is a consumable part in the mill.

[0003] Based on the technical problems existing in the liner in the prior art, the applicant has developed a variety of mill layer plates, including triangular liner, L-shaped, etc. The inventor found that the transition shape between the lifting part and the crushing part has a significant effect on the stress of the liner: when the lifting surface and the crushing surface are in a broken line transition, the stress level is higher and the liner is more prone to cracks. The test of the ball hitting the root of the liner found that the cracks in the liner with a broken line transition have a clear tendency to open. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a liner with an optimal shape structure, which has a lower stress level and a longer service life.

[0005] Another object of the present invention is to provide a mill cylinder with a longer service life.

[0006] The inventor has continuously reformed and innovated through long-term exploration and attempts, as well as multiple experiments and efforts, to solve the above technical problems. The technical solution provided by the present invention is to provide a streamlined wear-resistant lining, including a lining body, the lining body including an installation surface, a first crushing surface, a first lifting surface, a lifting top surface, a second lifting surface, and a second crushing surface, characterized in that a first transition surface is arranged between the first lifting surface and the first crushing surface, the first lifting surface, the first transition surface and the first crushing surface are smoothly transitioned in sequence, the first transition surface is a first curved surface, and the guide wire of the first curved surface is a curved segment of an ellipse or a circle; a second transition surface is arranged between the second lifting surface and the second crushing surface, the second lifting surface, the second transition surface and the second crushing surface are smoothly transitioned in sequence, the second transition surface is a second curved surface, and the guide wire of the second curved surface is a curved segment obtained in an ellipse or a circle.

[0007] According to one embodiment of the streamlined wear-resistant lining of the present invention, the conductor of the first curved surface is a first ellipse, and the length of the major axis of the first ellipse is 1 to 2 times the length of the minor axis; the conductor of the second curved surface is a second ellipse, and the length of the major axis of the second ellipse is 1 to 2 times the length of the minor axis.

[0008] According to one embodiment of the streamlined wear-resistant lining of the present invention, the conductor of the first curved surface is a first ellipse, and the length of the major axis of the first ellipse is 1.5 to 1.8 times the length of the minor axis; the conductor of the second curved surface is a second ellipse, and the length of the major axis of the second ellipse is 1.5 to 1.8 times the length of the minor axis.

[0009] According to an embodiment of the streamlined wear-resistant liner of the present invention, the first crushing surface is a curved surface or an inclined surface, and the first crushing surface is an extension surface of the first transition surface;

[0010] The first crushing surface is a curved surface, and the guide line of the first crushing surface curved surface and the guide line of the first transition surface curved surface are curve segments obtained from the same ellipse, or the first crushing surface is an inclined surface, and the inclined surface is tangent to the first transition surface curved surface;

[0011] The second crushing surface is a curved surface or an inclined surface, and the second crushing surface is an extension surface of the second transition surface;

[0012] The second crushing surface is a curved surface, and the guide line of the second crushing surface curved surface and the guide line of the second transition surface curved surface are curve segments obtained from the same ellipse, or the second crushing surface is an inclined surface, and the inclined surface is tangent to the second transition surface curved surface.

[0013] According to an embodiment of the streamlined wear-resistant lining of the present invention, when the first crushing surface is an inclined surface, the angle between the inclined surface and the horizontal plane is 0-40°; when the second crushing surface is an inclined surface, the angle between the inclined surface and the horizontal plane is 0-40°; the edge thickness of the wear-resistant lining is 60-120 mm.

[0014] According to an embodiment of the streamlined wear-resistant lining of the present invention, a reinforcement strip is provided at an edge of the first crushing surface away from the first lifting surface; and a reinforcement strip is provided at an edge of the second crushing surface away from the second lifting surface.

[0015] According to one embodiment of the streamlined wear-resistant lining of the present invention, the lifting top surface is a plane or a curved surface; the first lifting surface is a first inclined surface, and the angle r1 between the first inclined surface and the vertical surface is 10° to 40°; the second lifting surface is a second inclined surface, and the angle r2 between the second inclined surface and the vertical surface is 10° to 40°.

[0016] According to one embodiment of the streamlined wear-resistant lining of the present invention, the first crushing surface, the first transition surface, the first lifting surface, the second lifting surface, the second transition surface and the second crushing surface constitute an eight-shaped top; the first lifting surface, the lifting top surface and the second lifting surface constitute a lifting part, and the height of the lifting part is 50 to 400 mm.

[0017] According to an embodiment of the streamlined wear-resistant lining of the present invention, the conductor of the first curved surface is a first arc, the radius of the first arc is 50-900 mm; the second conductor is a second arc, the radius of the second arc is 50-900 mm.

[0018] The present invention also provides a mill cylinder, which is assembled from any of the above-mentioned streamlined wear-resistant lining plates, and two adjacent lining plates are spliced ​​to form a mineral material crushing space with a semi-elliptical or conical cross-section.

[0019] Compared with the prior art, one of the above technical solutions has the following advantages:

[0020] After contact analysis and stress intensity factor analysis of the V-notch, the lifting surface-crushing surface collision angle adopts an elliptical surface transition, which has a lower stress level, makes the liner safer and less prone to cracks. The cracks tend to open when the broken line transitions, while the cracks of the liner with the arc transition tend to close. Obviously, the cracks with a closing trend are not easy to expand.

[0021] In one embodiment of the present invention, the lifting surface and crushing surface of the liner are extended by an elliptical surface. After the liners are spliced ​​and installed, the crushing surface forms an elliptical space. The crushing force of the ore and the steel balls on the ore is easily concentrated in the elliptical space, the ore crushing rate is increased, and the concentration point of the residual impact force is just at the connection between the liners. The gap at the connection reduces the stress concentration in the crushed ore, forming a dispersion effect.

[0022] The setting of the crushing surface, when the steel ball hits the liner, the stress level at the crack is lower when the elliptical surface or inclined surface transitions, the risk of liner cracks is smaller, the liner and liner are spliced ​​into an elliptical space with a large volume, and the force is concentrated to crush the ore. After crushing, the gap at the connection between the two liners is used to disperse the stress, and the stress level borne by the liner in the crushed ore is lower. When the existing liner adopts a broken line transition, the crack has a tendency to open, while the crack of the liner with a circular arc transition tends to close. Obviously, the crack with a closing trend is not easy to expand.

[0023] The streamlined liner of the present invention is not prone to cracks, has a large crushing space and a higher crushing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the cross-sectional structure of a preferred embodiment of the streamlined wear-resistant liner of the present invention.

[0026] Figure 2 It is a schematic cross-sectional structure diagram of another preferred embodiment of the streamlined wear-resistant liner of the present invention.

[0027] Figure 3 It is a schematic cross-sectional structure diagram of another preferred embodiment of the streamlined wear-resistant liner of the present invention.

[0028] Figure 4 It is a crack opening trend diagram during the impact process of the root of the broken line transition wear-resistant liner.

[0029] Figure 5 It is a crack opening trend diagram during the impact process of the root of the curved transition wear-resistant liner.

[0030] Figure 6 It is a schematic diagram of the partial cross-sectional structure of a preferred embodiment of the grinding mill cylinder of the present invention.

[0031] Figure 7 It is a schematic diagram of the distribution of the mass of the ore carried by each liner in the process of crushing the ore in the mill cylinder of the present invention.

[0032] The marks in the figure are 100 liner body,

[0033] 101 First Broken Surface,

[0034] 102 first transition surface,

[0035] 103 First lifting surface,

[0036] 104 Lift the top surface,

[0037] 105 Second lifting surface,

[0038] 106 Second transition surface,

[0039] 107 The second broken surface,

[0040] 108 mounting surface,

[0041] 110 Reinforcement strips. DETAILED DESCRIPTION

[0042] The following is a description with reference to the accompanying drawings and a specific embodiment.

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in the subsequent drawings.

[0045] Example 1

[0046] See also Figure 1 . Figure 1 The streamlined wear-resistant liner shown includes a liner body 100, and the liner body 100 includes a mounting surface 108, a first crushing surface 101, a first transition surface 102, a first lifting surface 103, a lifting top surface 104, a second lifting surface 105, a second transition surface 106, and a second crushing surface 107. The first transition surface 102 is arranged between the first lifting surface 103 and the first crushing surface 101. The first lifting surface 103, the first transition surface 102 and the first crushing surface 103 are smoothly transitioned in sequence. The first transition surface 102 is a first curved surface, and the conductor of the first curved surface is a curved segment obtained in an ellipse or a circle; in this embodiment, the conductor of the first curved surface is a curved segment obtained in an ellipse. The second transition surface 106 is arranged between the second lifting surface 105 and the second crushing surface 107. The second lifting surface 105, the second transition surface 106 and the second crushing surface 107 are smoothly transitioned in sequence. The second transition surface 106 is a second curved surface, and the conductor of the second curved surface is a curved segment obtained in an ellipse or a circle. In this embodiment, the conductive line of the second curved surface is a curved line segment obtained from an ellipse.

[0047] As a further embodiment, the length of the major axis a of the ellipse is 1 to 2 times the length of the minor axis b, that is, the length of the major axis a is greater than 1 times and less than or equal to 2 times the length of the minor axis b. Preferably, the length of the major axis a of the ellipse is 1.5 times or 1.8 times the length of the minor axis b. Figure 1 The streamlined wear-resistant lining is placed horizontally, the major axis a of the ellipse has an angle of 0° to 5° with the horizontal plane, and the major axis of the ellipse is tilted downward at a fixed point. Figure 1 It is shown that the angle between the major axis a of the ellipse and the horizontal plane is 3°. Of course, those skilled in the art can adjust the angle according to the concept of the present invention.

[0048] See also Figure 1 The conductive line of the curved surface where the first transition surface 102 and the second transition surface 106 are located is a curve segment obtained in an ellipse, and the length of the curve segment is not greater than 1 / 4 of the circumference of the ellipse. Specifically, the curve segment is less than the length from a major axis vertex to a minor axis vertex of the ellipse.

[0049] See also Figure 1 In one embodiment of the streamlined wear-resistant liner of the present invention, the first crushing surface 103 is a curved surface, and the first crushing surface 101 is an extension of the first transition surface 102; the second crushing surface 107 is a curved surface, and the second crushing surface 107 is an extension of the second transition surface 106. The guide line between the first crushing surface curved surface and the first curved surface is a curved segment obtained from the same ellipse, and the guide line between the second crushing surface curved surface and the second curved surface is a curved segment obtained from the same ellipse, and the length of the curved segment is not greater than 1 / 4 of the circumference of the ellipse, specifically, the curved segment is less than the length from a major axis vertex to a minor axis vertex of the ellipse. The first lifting surface 103 is a first inclined surface, and the angle r1 between the first inclined surface and the vertical surface L is any angle between 10° and 45°, such as 13°, 27°, 43°, and other angles within the range; the second lifting surface 106 is a second inclined surface, and the angle r2 between the second inclined surface 106 and the vertical surface L is any angle between 10° and 45°, such as 13°, 27°, 43°, and other angles within the range. The angle r1 and the angle r2 are equal or different. In this embodiment, Figure 1 The case where the angle r1 is equal to the angle r2 is shown.

[0050] The lifting top surface 104 is a plane or a curved surface. The first crushing surface 101, the first transition surface 102, the first lifting surface 103, the lifting top surface 104, the second lifting surface 105, the second transition surface 103, and the second crushing surface 107 form a herringbone top, which can also be considered as an eight-shaped top, or can be regarded as a shape similar to a triangle. The height of the lifting part formed by the first lifting surface 103, the lifting top surface 104, and the second lifting surface 105 is not less than 150 mm.

[0051] Figure 4 The figure shows the crack opening trend of the root of the wear-resistant liner with common broken line transition under the impact of a steel ball. Figure 5It shows that when the streamlined wear-resistant liner in this embodiment is impacted by a steel ball, the crack at the root of the plate tends to open during the impact process. When the ball directly hits the root of the liner, the crack of the liner with a broken line transition has an obvious opening trend, while the crack of the streamlined liner tends to close. Obviously, cracks with a closing trend are not easy to expand. The research and analysis results show that the transition zone should adopt a smooth curve transition, and the curvature of the transition zone will have different effects on the proximal load and the distal load. For the proximal load: the closer the radius of curvature is to the ball, the lower the stress level; for the distal load, the larger the radius of curvature, the smaller the stress intensity factor generated by the distal load at the crack. Therefore, the radius of curvature should be selected. Using an elliptical surface as a transition surface is more conducive to improving the service life of the wear-resistant liner.

[0052] Example 2

[0053] See also Figure 2 Another embodiment of the streamlined wear-resistant liner of the present invention is different from Example 1 in that the first crushing surface 101 is an inclined surface, and the inclined surface is tangent to the first lifting surface curved surface. The second crushing surface 107 is an inclined surface, and the inclined surface is tangent to the second lifting surface curved surface. The first crushing surface 101 and the second crushing surface 107 are symmetrically arranged, and the slope is 5° to 20°, for example, 5°, 10°, 15°, 18°, 20°, and any angle between 5° and 20°.

[0054] Example 3

[0055] See also Figure 3 According to an embodiment of the streamlined wear-resistant liner of the present invention, the difference from Example 2 is that a reinforcement strip 110 is provided on the edge of the first crushing surface 101 away from the first lifting surface; and a reinforcement strip 110 is also provided on the edge of the second crushing surface 107 away from the second lifting surface. The reinforcement strip 110 is provided along the length direction of the streamlined wear-resistant liner. The reinforcement strip 110 is integrally formed with the streamlined wear-resistant liner body.

[0056] Example 4

[0057] See also Figure 6 In this embodiment, the streamlined wear-resistant liner described in Example 1 is assembled to obtain a mill cylinder. 20 to 90 triangular wear-resistant liners are assembled to form a mill cylinder. The mill can be an autogenous mill or a semi-autogenous mill. Streamlined wear-resistant liners with exactly the same specifications can be used for assembly. Of course, streamlined wear-resistant liners with different specifications can also be used for assembly. For example, streamlined wear-resistant liners with alternating heights are used for assembly. It can also be assembled in combination with existing crushing liners. Figure 6 The figure shows the assembly of 25 streamlined wear-resistant liners with exactly the same specifications. Figure 7The figure shows the simulated distribution of the mass of the ore carried by each liner in the mill cylinder of the present invention during the ore crushing process.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0060] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0062] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A streamlined wear-resistant liner, comprising a liner body, wherein the liner body comprises a mounting surface, a first crushing surface, a first lifting surface, a lifting top surface, a second lifting surface, and a second crushing surface, characterized in that: A first transition surface is arranged between the first lifting surface and the first crushing surface, and the first lifting surface, the first transition surface and the first crushing surface smoothly transition in sequence, and the first transition surface is a first curved surface, and the guide wire of the first curved surface is a first ellipse, and the length of the major axis of the first ellipse is 1.5 to 1.8 times the length of the minor axis; a second transition surface is arranged between the second lifting surface and the second crushing surface, and the second lifting surface, the second transition surface and the second crushing surface smoothly transition in sequence, and the second transition surface is a second curved surface, and the guide wire of the second curved surface is a second ellipse, and the length of the major axis of the second ellipse is 1.5 to 1.8 times the length of the minor axis; the first lifting surface is a first inclined surface, and the angle r1 between the first inclined surface and the vertical surface is 10° to 40°; the second lifting surface is a second inclined surface, and the angle r2 between the second inclined surface and the vertical surface is 10° to 40°.

2. The streamlined wear-resistant lining according to claim 1, characterized in that: The first crushing surface is a curved surface or an inclined surface, and the first crushing surface is an extension surface of the first transition surface; The first crushing surface is a curved surface, and the guide line of the first crushing surface curved surface and the guide line of the first transition surface curved surface are curve segments obtained from the same ellipse, or the first crushing surface is an inclined surface, and the inclined surface is tangent to the first transition surface curved surface; The second crushing surface is a curved surface or an inclined surface, and the second crushing surface is an extension surface of the second transition surface; The second crushing surface is a curved surface, and the guide line of the second crushing surface curved surface and the guide line of the second transition surface curved surface are curve segments obtained from the same ellipse, or the second crushing surface is an inclined surface, and the inclined surface is tangent to the second transition surface curved surface.

3. The streamlined wear-resistant lining according to claim 2 is characterized in that: When the first crushing surface is an inclined surface, the angle between the inclined surface and the horizontal plane is 0-40°; when the second crushing surface is an inclined surface, the angle between the inclined surface and the horizontal plane is 0-40°; the edge thickness of the wear-resistant lining is 60~120mm.

4. The streamlined wear-resistant lining according to claim 1 or 2, characterized in that: A reinforcement strip is provided at an edge of the first crushing surface away from the first lifting surface; and a reinforcement strip is provided at an edge of the second crushing surface away from the second lifting surface.

5. The streamlined wear-resistant lining according to claim 1, characterized in that: The lifting top surface is a flat surface or a curved surface.

6. The streamlined wear-resistant lining according to claim 1 or 5, characterized in that: The first crushing surface, the first transition surface, the first lifting surface, the second lifting surface, the second transition surface and the second crushing surface constitute an eight-shaped top; the first lifting surface, the lifting top surface and the second lifting surface constitute a lifting part, and the height of the lifting part is 50~400mm.

7. A mill cylinder, which is assembled from the streamlined wear-resistant lining plates according to any one of claims 1 to 6, wherein two adjacent lining plates are spliced ​​together to form a mineral crushing space with a semi-elliptical cross section.

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