Grinding disc of sand mill and assembly structure of grinding disc

Abstract

The utility model aims to provide the grinding disc of the sand mill and the assembly structure of the grinding disc, so that the assembly operation efficiency of the grinding disc is improved. The grinding disc is formed by connecting the first semi-circular disc and the second semi-circular disc in a Haff type enclosing mode, and during assembling, the first semi-circular disc and the second semi-circular disc are directly assembled and disassembled in a Haff type mode at the corresponding shaft section positions of the main shaft of the sand mill, so that assembling and disassembling of the grinding disc can be achieved. Compared with the construction scheme that an integral circular ring type grinding disc needs to be connected to the main shaft of the sand mill in a sleeving mode in the prior art, the disassembly and assembly efficiency is greatly improved, and especially when a certain grinding disc which is seriously abraded is replaced, only a specific grinding disc needs to be disassembled and assembled, and other grinding discs do not need to be disassembled and assembled.

Description

Technical Field

[0001] The utility model relates to a sand mill rotor, in particular to an improvement on the rotor structure of the sand mill. Background Art

[0002] Sand mill can be regarded as a device for further grinding the crushed mineral materials. Wear-resistant bushings are attached to the inner wall of the mill cylinder. A stirring disc or grinding disc is arranged on the mill shaft extending into the cylinder cavity to form the sand mill rotor. The slurry is stably transported to the mill through a hose pump after slag separation. The stirring disc in the mill cylinder rotates at high speed driven by the main shaft, so that the high-hardness and wear-resistant grinding medium moves around the axial direction and rotates. The mineral particles are subjected to the scrubbing force of the high-speed grinding medium to achieve the grinding process. Usually, the rotor composed of the mill shaft and the stirring disc arranged on it is arranged horizontally, that is, the mill is arranged horizontally. There is an independent grinding area between every two stirring discs. Under a certain feeding pressure, the particle size of the mineral particles changes from large to small along the upstream to downstream flow path from the feed port to the discharge port, and under the action of the centrifugal force of high-speed rotation, the minerals and the grinding media are radially distributed from the mill axis to the inner wall of the cylinder according to the particle size from small to large, realizing the selective grinding of "big grinding big, small grinding small".

[0003] In view of the fact that the working process of the sand mill is the frequent friction between mineral particles, grinding media, wear-resistant bushings and stirring discs, the process of grinding mineral particles is accompanied by the wear and consumption of wear-resistant bushings and stirring discs, and the replacement of wear-resistant bushings and stirring discs as consumables becomes prominent and necessary. For the prior art arrangement scheme in which the mill cylinder is an integral type and the mill shaft is a cantilever beam, the function of replacing the wear-resistant bushings and stirring discs must firstly displace the mill cylinder axially. For this purpose, it is necessary not only to provide a track and a corresponding displacement mechanism for the mill cylinder, but also to ensure that the length of the track for displacing the mill cylinder is consistent with the length of the cylinder, which occupies a large area. The larger the sand mill specification, the more prominent this problem is. The name is "Large-area wear-resistant structure of large sand mill cylinder" (document number CN206868346U-hereinafter referred to as document 1). The sand mill cylinder in document 1 is provided with brackets (5) for supporting end covers at both ends, and a pulley is provided at the lower end of the bracket. At the same time, a track matching the bracket is provided below the bracket, which inevitably occupies a large area.

[0004] The name is "Sand Mill Split Cylinder" (Document No. CN212441444U - hereinafter referred to as Document 2). Although Document 2 designs the cylinder as a structure of a first half cylinder 1 and a second half cylinder 2 that are assembled in half and can be detachably connected, a cylindrical rigid lining 3 that is tightly attached to the cylinder is arranged in the cylinder, and a flexible lining layer 4 is covered on the inner wall surface, which is still a complete tubular body. Therefore, when replacing the rigid lining 3 and the flexible lining layer 4, it is still necessary to displace the cylinder axially by a stroke greater than its own length.

[0005] The document entitled “A large-scale sand mill barrel moving device” (document number CN206437540U-hereinafter referred to as document 3) provides a solution for the movement of the sand mill barrel; the document entitled “Large-flow three-eccentric disc horizontal sand mill” (document number CN206526876 U-hereinafter referred to as document 4) has an axial hole 252 in the middle of the cam disc body 251 of the eccentric disc 25 and a special-shaped hole 253 on the disc body, thereby constituting a grinding disc or a stirring disc as a complete disc body, and its assembly with the main shaft 22 must be carried out in a sleeve-through manner. If the eccentric disc 25 away from the suspension end of the main shaft 22 is worn and needs to be replaced, all the eccentric discs 25 and the rotor assembly 24 on the main shaft 22 need to be removed, and this solution seriously affects the assembly efficiency.

[0006] The solutions of the above-mentioned documents 1, 2, 3, and 4 are all implemented by the arrangement of the mill main shaft according to the cantilever beam. Otherwise, if the mill shaft adopts a simply supported beam support solution, that is, bearings are arranged on the end covers of the mill cylinder to support the mill shaft, the force condition of the mill shaft can be improved, and the volume of the mill cylinder can be further increased. The problem is that the removal of the mill cylinder will increase new difficulties and workload. For example, the name is "A horizontal sand mill" (document number CN207187875U-hereinafter referred to as document 5), the rotating shaft in the document 5 is inserted into the cylinder, and its two ends pass through the shaft hole and extend outward. The structural solution between the rotating shaft and the cylinder forms an insurmountable difficulty for the replacement of wear parts.

[0007] Another serious defect in the prior art is the difficulty in assembling the grinding disc, because the grinding disc in the prior art is a complete annular disc, and its assembly operation must implement the sleeve-type assembly of the grinding disc and the mill shaft. For example, the grinding disc at the feed end is most susceptible to wear and the degree of wear is also the most serious. In order to replace the grinding disc at the feed end, all grinding discs must be disassembled, and grinding discs whose wear degree has not reached the replacement condition must also be disassembled, which brings a huge workload to the maintenance of the sand mill. Utility Model Content

[0008] The utility model aims to provide a sand mill grinding disc and an assembly structure thereof, so as to improve the assembly efficiency of the grinding disc.

[0009] A sand mill grinding disc, characterized in that the grinding disc is formed by a first semi-circular ring disc and a second semi-circular ring disc being enclosed in a half-shape at the diameter edge to form a circular ring disc, a key groove is arranged on the inner arc edge of the first semi-circular ring disc and / or the second semi-circular ring disc, and a through hole K is arranged on the disc surface.

[0010] Another object of the utility model is to provide an assembly structure for a grinding disc of a sand mill, so as to improve the reliability and stability of the grinding disc when the half-structure half is enclosed.

[0011] An assembly structure of a grinding disc of a sand mill, characterized in that: the grinding disc is formed by a first semi-circular ring disc and a second semi-circular ring disc being enclosed in a half-shaped manner at the diameter edge to form a circular ring disc, a key groove is arranged on the inner arc edge of the first semi-circular ring disc and / or the second semi-circular ring disc, and a through hole K is arranged on the disc surface of the grinding disc;

[0012] There is an annular convex strip or annular groove on the disc surface of the grinding disc near the inner arc disc edge, the protruding direction of the annular convex strip or the notch of the annular groove points to the outside of the disc surface of the grinding disc, the wall thickness of the end of the annular sleeve is consistent with the groove width of the annular groove and the end of the annular sleeve is embedded in the groove cavity of the annular groove, and a sleeve is arranged outside the two adjacent annular sleeves arranged axially at intervals, and the sleeve consists of a first and second sleeve half-body half-structure.

[0013] In the above technical scheme, the grinding disc is composed of a first semi-circular ring disc and a second semi-circular ring disc connected in a half-style enclosure, and the assembly is carried out using a ring sleeve and a sleeve. The first semi-circular ring disc and the second semi-circular ring disc are directly loaded and unloaded in a half-style at the corresponding shaft section position of the sand mill main shaft to realize the assembly and disassembly of the grinding disc. Compared with the structural scheme in the prior art that the integral annular grinding disc needs to be sleeved on the sand mill main shaft, the disassembly efficiency is greatly improved, especially when replacing a severely worn grinding disc, only a specific grinding disc needs to be disassembled without disassembling other grinding discs. When repairing and replacing, only the sleeve on one side of the grinding disc needs to be removed. Under the constraints of the sleeve and the ring sleeve, the newly replaced grinding disc is quickly fixed on the mill shaft by radial constraints, and the axial positioning and limiting of the grinding disc on the mill shaft are solved at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the decomposed state of the utility model;

[0015] Figure 2a , 2b They are schematic diagrams of the three-dimensional structures of the first semi-circular ring disk and the second semi-circular ring disk;

[0016] Figure 3 It is a three-dimensional structural diagram of the sand mill in a disassembled state;

[0017] Figure 4 It is a structural schematic diagram of the utility model;

[0018] Figure 5 yes Figure 4 AA section view in;

[0019] Figure 6 It is a three-dimensional structural schematic diagram of the utility model in a disassembled state;

[0020] Figure 7 yes Figure 6 A local enlarged schematic diagram of the . DETAILED DESCRIPTION

[0021] For the sake of convenience, the following Figure 3 The basic structure of the sand mill is briefly described as follows:

[0022] Figure 3 In the embodiment, the motor is placed in the chassis 1, the reducer 2 connected to the motor is connected to one end of the sand mill main shaft 4 via the coupling 3, the left and right bearing seats 5 and 6 arranged at the left and right end frames 7 and 8 are provided with bearings to provide the sand mill main shaft 4 with a simple beam type rotation support, the cylinder 9 is sleeved on the sand mill main shaft 4, and the grinding discs 10 are arranged at intervals on the sand mill main shaft 4 located in the cylinder 9, and the grinding slurry to be ground enters from the feed end of the cylinder 9, and the ground material is discharged from the discharge end. In order to provide a simple beam type support for the sand mill main shaft 4, it is necessary to set the left and right bearing seats 5 and 6 at both ends of the sand mill main shaft 4. If the grinding disc continues to adopt the existing technical solution, that is, the grinding disc is an integral annular shape, the assembly relationship between the left and right bearing seats 5 and 6 at both ends and the sand mill main shaft 4 must first be released, and the grinding disc 10 must also be assembled and disassembled in sequence, and low efficiency is inevitable.

[0023] It should also be noted that in order to further reflect the disassembly and assembly efficiency of the utility model, the cylinder 9 adopts a unit cylinder section solution, which can further demonstrate the convenience of the present application. Regarding the solution of designing the cylinder 9 as a unit cylinder section, the applicant described it in detail in other applications filed on the same day.

[0024] like Figure 1 As shown in , 2, the sand mill grinding disk, the grinding disk 10 is composed of a first semi-circular ring disk 10A and a second semi-circular ring disk 10B which are enclosed in a half-shape at the diameter edge to form a circular ring disk, a key groove 11 is arranged on the inner arc disk edge of the first semi-circular ring disk 10A and / or the second semi-circular ring disk 10A, and a through hole K is arranged on the disk surface.

[0025] The above solution is to design the grinding disc 10 into a half-body structure, that is, the grinding disc 10 is composed of a first semi-circular ring disc 10A and a second semi-circular ring disc 10B which are enclosed at the diameter edge in a Hough-like manner to form a circular ring disc. The grinding disc 10 composed of the first semi-circular ring disc 10A and the second semi-circular ring disc 10B needs to rotate synchronously with the sand mill main shaft 4, such as Figure 4 , 5 , 6, and 7, for this purpose, a key groove 11 is provided on the inner arc edge of the first semicircular ring disk 10A and / or the second semicircular ring disk 10B, that is, the key groove 11 can be provided on the first semicircular ring disk 10A or the second semicircular ring disk 10AB, or the key groove 11 can be provided on both the first semicircular ring disk 10A and the second semicircular ring disk 10B. Figure 1 As shown in , 2, and 7, this can improve the reliability of torque transmission and the uniformity of torque distribution, and the via K is used for the slurry to pass through.

[0026] There is an annular convex strip or annular groove 12 on the surface of the grinding disc 10 near the inner arc edge, and the protruding direction of the annular convex strip or the notch of the annular groove 12 points to the outside of the surface of the grinding disc 10. The example given in the figure is a scheme of setting the annular groove 12. Preferably, the notch of the annular groove 12 points to the surface of the grinding disc 10 perpendicularly. Figure 1 As shown in 2, the first semicircular ring disk 10A and the second semicircular ring disk 10B both have semicircular annular grooves 12A and 12B within a semicircular arc range, and the semicircular annular grooves 12A and 12B on the first semicircular ring disk 10A and the second semicircular ring disk 10B form a full-circular annular groove 12.

[0027] The outer peripheral surface, axial side end surface and hole wall of the grinding disc 10 are wear-resistant layers 13. The body of the grinding disc 10 can be made of steel with appropriate strength and rigidity as the internal skeleton body, and the outer part is made of wear-resistant material. When the wear-resistant layer is seriously worn, it can be disassembled and replaced, and the wear-resistant layer of the disassembled worn parts can be repaired to reduce maintenance costs.

[0028] In order to ensure that the first semi-circular disk 10A and the second semi-circular disk 10B form a complete circular disk shape when they are first assembled, the two ends of the straight sides of the first semi-circular disk 10A and the second semi-circular disk 10B are provided with connecting ears to connect with each other. The specific structure of the connecting ears is as follows: Figure 1 As shown in , 2, and 7, the end of the straight side surface of the first semicircular ring disk 10A is provided with a lug 14 protruding toward the straight side surface of the second semicircular ring disk 10B, and the lug 14 is provided with a connecting hole 141 perpendicular to the disk surface, and the straight side surface of the second semicircular ring disk 10B is provided with a recess 15 for accommodating the lug 14, and the pin 16 passes through the connecting hole 141 and is connected to the recess 15. In addition, the lug 14 is provided at one end of the straight side surface of the first semicircular ring disk 10A, and the recess 15 is provided at the other end, so that the first semicircular ring disk 10A and the second semicircular ring disk 10B have the same shape, thereby reducing the number of molds and the number of spare parts.

[0029] The recess 15 is a semicircular groove, and the outer end of the groove extends to one side of the second semicircular ring disk 10B, and the inner end is located in the middle of the second semicircular ring disk 10B in the thickness direction. The notch constituting the recess 15 points to the straight edge perpendicular to the second semicircular ring disk 10B. There is a pin hole 151 on the second semicircular ring disk 10B corresponding to the inner end of the recess 15, and the core of the pin hole 151 is perpendicular to the disk surface of the second semicircular ring disk 10B. It should be noted that Figure 7 In the figure, the first semi-circular disk 10A matched with the second semi-circular disk 10B is hidden, and the second semi-circular disk 10B matched with the first semi-circular disk 10A is hidden, which is conducive to showing the contents of related details, such as the lug 14, the recess 15, and the connection status of the annular sleeve 20 and the sleeve 30.

[0030] During installation, the first semicircular ring disk 10A and the second semicircular ring disk 10B are enclosed together, and then the pin 16 is used to penetrate and connect the pin hole 151 and the connecting hole 141, so that the first semicircular ring disk 10A and the second semicircular ring disk 10 are assembled into a complete disc shape. Since the lug 14 is placed in the recess 15, when the first semicircular ring disk 10A and the second semicircular ring disk 10B are enclosed, the straight edge gap of the entire grinding disk 10 is fine and flat, and the disk surfaces of the first semicircular ring disk 10A and the second semicircular ring disk 10B are coplanar and flush. Under the common constraint of the sleeve 30 set at the annular groove 12, the integrity of the grinding disk 10 is fully guaranteed; in addition, the lug 14 and the recess 15 are mutually accommodated and embedded, and the pin 16 and the pin hole 151 and the connecting hole 141 are penetrated and matched, so that the connection of the integrity of the grinding disk 10 is realized, and the function of transmitting torque is also achieved.

[0031] Example 2

[0032] like Figure 4 , 5 As shown in FIGS. 6 and 7, the assembly structure of the grinding disc of the sand mill, the grinding disc 10 is composed of a first semi-circular ring disc 10A and a second semi-circular ring disc 10B which are enclosed in a half-diameter manner to form a circular ring disc, a key groove 11 is arranged on the inner arc disc edge of the first semi-circular ring disc 10A and / or the second semi-circular ring disc 10A, and a through hole K is arranged on the disc surface of the grinding disc 10; an annular convex strip or annular groove 12 is arranged on the disc surface of the grinding disc 10 near the inner arc disc edge, the protruding direction of the annular convex strip or the notch of the annular groove 12 points to the outside of the disc surface of the grinding disc 10, the wall thickness of the end of the annular sleeve 20 is consistent with the groove width of the annular groove 12 and the end of the annular sleeve 20 is embedded in the groove cavity of the annular groove 12, and a sleeve 30 is arranged outside the two adjacent annular sleeves 20 arranged axially at intervals, and the sleeve 30 is composed of a first and a second sleeve half body 30A, 30B of a half-structure.

[0033] Preferably, a key connection is formed between the sleeve hole in the middle of the annular sleeve 20 and the mill shaft 4, and an axially protruding convex ring is embedded in the groove cavity of the annular groove 12 on the periphery of the annular sleeve 20. The tube cavity of the sleeve 30 is a stepped hole with large ends and a small middle section. The large-diameter tube end section is sleeved on the outer periphery of the annular sleeve 20, and the two ends of the small-diameter tube section are abutted on the opposite side end surfaces of the two annular sleeves 20. The two ends of the sleeve 30 are abutted against the opposite disk surfaces of two adjacent grinding disks 10.

[0034] The end wall thickness of the annular sleeve 20 matches the groove width of the annular groove 12 so that the end of the annular sleeve 20 is embedded in the groove cavity of the annular groove 12. Under the constraint of the annular sleeve 20, the first semi-annular disk 10A and the second semi-annular disk 10B will always maintain the shape of a complete annular disk. In order to prevent the annular sleeve 20 from being exposed to the slurry, a sleeve 30 is arranged outside the two adjacent annular sleeves 20 arranged axially at intervals. The sleeve 30 is as shown in FIG. Figure 4 ,6 As shown in , 7, specifically, the sleeve 30 is composed of the first and second sleeve halves 30A, 30B of a Hough structure, that is, the ends of the first and second sleeve halves 30A, 30B at the joint are detachably connected by bolts, and the first and second sleeve halves 30A, 30B surround the two adjacent circular sleeves 20 with a fixed interval, and only the outer wall of the sleeve 30 formed by the first and second sleeve halves 30A, 30B is exposed to the slurry. For this purpose, it is only necessary to add a wear-resistant layer on the outer peripheral wall surface of the first and second sleeve halves 30A, 30B, and the two ends of the first and second sleeve halves 30A, 30B are directly in contact with the grinding disc 10.

[0035] The setting of the sleeve 30 isolates the annular sleeve 20 from the slurry. Since the annular sleeve 20 has no wear, there is no need to replace it. It can be placed on the mill shaft 4 during initial installation, which not only reduces the assembly workload but also reduces the replacement workload of wear parts. The cooperation of the sleeve 30, the annular sleeve 20 and the grinding disc 10 solves the axial positioning and limiting problems of the grinding disc 10, and simplifies the processing workload of the mill shaft 4. The sleeve 30 also applies radial constraints to the first semi-circular ring disc 10A and the second semi-circular ring disc 10B of the grinding disc 10, ensuring the reliable integrity of the grinding disc 10.

[0036] In order to ensure that the annular sleeve 20 rotates synchronously with the mill shaft 4, a keyway is also provided on the inner tube wall of the sleeve 30 to form a key connection with the key 4a on the mill shaft 4. The sleeves 30 are connected by bolts 31, so that the first and second sleeve halves 30A, 30B are enclosed and connected to form a complete and reliable sleeve 30.

Claims

1. A sand mill grinding disc, characterized in that: The grinding disc (10) is composed of a first semi-circular disc (10A) and a second semi-circular disc (10B) which are enclosed in a Hough-like manner at the diameter edge to form a circular disc. A key groove (11) is arranged on the inner arc edge of the first semi-circular disc (10A) and / or the second semi-circular disc (10B), and a through hole K is arranged on the disc surface.

2. The sand mill grinding disc according to claim 1, characterized in that: An annular convex strip or an annular groove (12) is provided on the surface of the grinding disc (10) near the inner arc edge, and the protruding direction of the annular convex strip or the notch of the annular groove (12) points to the outside of the surface of the grinding disc (10).

3. The sand mill grinding disc according to claim 2, characterized in that: The annular groove (12) has an opening pointing perpendicular to the surface of the grinding disc (10).

4. The sand mill grinding disc according to claim 1, characterized in that: The outer peripheral surface, axial side end surface and hole wall of the through hole K of the grinding disc (10) are formed into a wear-resistant layer (13).

5. The sand mill grinding disc according to claim 1, characterized in that: The two ends of the straight sides of the first semi-circular ring disk (10A) and the second semi-circular ring disk (10B) are provided with connecting ears to connect with each other.

6. The sand mill grinding disc according to claim 5, characterized in that: The end of the straight edge surface of the first semicircular ring disk (10A) is provided with a lug (14) protruding toward the straight edge surface of the second semicircular ring disk (10B), the lug (14) is provided with a connecting hole (141) perpendicular to the disk surface, the straight edge surface of the second semicircular ring disk (10B) is provided with a recess (15) for accommodating the lug (14), and a pin (16) passes through the connecting hole (141) and is connected to the recess (15).

7. The sand mill grinding disc according to claim 5 or 6, characterized in that: The recess (15) is a semicircular groove, and the outer end of the groove extends to one side of the disk surface of the second semicircular ring disk (10B), and the inner end is located in the middle of the disk thickness direction of the second semicircular ring disk (10B). The groove opening constituting the recess (15) points to a straight edge perpendicular to the second semicircular ring disk (10B). The second semicircular ring disk (10B) corresponding to the inner end of the recess (15) has a pin shaft hole (151), and the core of the pin shaft hole (151) is perpendicular to the disk surface of the second semicircular ring disk (10B).

8. An assembly structure for a sand mill grinding disc, characterized in that: The grinding disc (10) is composed of a first semi-circular disc (10A) and a second semi-circular disc (10B) which are enclosed in a Hough-like manner at the diameter edge to form a circular disc, a key groove (11) is arranged on the inner arc edge of the first semi-circular disc (10A) and / or the second semi-circular disc (10B), and a through hole K is arranged on the disc surface of the grinding disc (10); An annular convex strip or annular groove (12) is provided on the surface of the grinding disc (10) near the inner arc edge, the protruding direction of the annular convex strip or the notch of the annular groove (12) points to the outside of the surface of the grinding disc (10), the wall thickness of the end of the annular sleeve (20) matches the groove width of the annular groove (12) and the end of the annular sleeve (20) is embedded in the groove cavity of the annular groove (12), and a sleeve (30) is provided outside two adjacent annular sleeves (20) arranged axially spaced apart, and the sleeve (30) is composed of a first sleeve half body (30A, 30B) and a half-type structure.

9. The assembly structure of the sand mill grinding disc according to claim 8, characterized in that: A key connection is formed between the sleeve hole in the middle of the annular sleeve (20) and the mill shaft (4). The annular sleeve (20) has an axially protruding convex ring on its periphery, which is embedded in the groove cavity of the annular groove (12). The tube cavity of the sleeve (30) is a stepped hole with large ends and a small middle section. The large-diameter tube end section is sleeved on the outer periphery of the annular sleeve (20), and the two ends of the small-diameter tube section are abutted on the opposite side end surfaces of the two annular sleeves (20). The two ends of the sleeve (30) are abutted against the opposite disk surfaces of two adjacent grinding disks (10).

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