CN117839821A - Sand mill grinding disc and assembly structure thereof - Google Patents

Abstract

The invention aims to provide a grinding disc of a sand mill and an assembly structure thereof, which improve the assembly operation efficiency of the grinding disc. The grinding disc is formed by half type enclosing connection of the first semicircular disc and the second semicircular disc, and when the grinding disc is assembled, the first semicircular disc and the second semicircular disc can be directly assembled and disassembled by half type assembling and disassembling at the corresponding shaft section positions of the main shaft of the grinding machine. Compared with the prior art, the integral circular grinding disc needs to be sleeved on the structural scheme of the main shaft of the grinding mill, the dismounting efficiency is greatly improved, and particularly, only a specific grinding disc is required to be dismounted when a certain grinding disc with serious abrasion is replaced, and other grinding discs are not required to be dismounted.

Description

Sand mill grinding disc and assembly structure thereof

Technical Field

The invention relates to a sand mill rotor, in particular to an improvement of a rotor structure of a sand mill.

Background

The sand mill is a device for further grinding crushed mineral materials, the inner wall of the mill cylinder is additionally provided with a wear-resistant lining, a stirring disc or a grinding disc is arranged on a mill shaft penetrating and extending into the cylinder cavity to form a sand mill rotor, ore pulp is stably conveyed into the mill through a hose pump after slag isolation, the stirring disc in the mill cylinder is driven by a main shaft to realize high-speed rotation, so that high-hardness wear-resistant grinding media do axial movement and autorotation movement, and mineral particles are subjected to scrubbing force of the grinding media moving at high speed, thereby realizing the grinding process. In general, the mill shaft and the rotor formed by the stirring discs arranged on the mill shaft are horizontally arranged, namely, the mill is horizontally arranged, an independent ore grinding area is arranged between every two stirring discs, the particle size of mineral particles on a flow path from the upstream to the downstream in sequence from a feed inlet to a discharge outlet under a certain ore feeding pressure is changed from large to small, and under the centrifugal force effect of high-speed rotation, minerals and ore grinding media are radially distributed from small to large according to the particle size from the mill shaft to the inner wall of a cylinder body, so that 'large ore grinding and small ore grinding' selective ore grinding is realized.

In view of the frequent friction between mineral particles, grinding media, wear-resistant bushings and stirring discs in the working process of the sand mill, the abrasion consumption of the wear-resistant bushings and the stirring discs is accompanied by the grinding process of the mineral particles, and the replacement of the wear-resistant bushings and the stirring discs as consumable materials becomes remarkable and necessary. For the arrangement scheme that the mill cylinder in the prior art is integral and the mill shaft is a cantilever beam, the functions of replacing the wear-resistant bushing and the stirring disc are required to move the mill cylinder along the axial direction, so that rails and corresponding displacement mechanisms are required to be provided for the mill cylinder, the rail length of the displacement mill cylinder is especially ensured to be consistent with the length of the cylinder, the occupied area is large, the larger the specification of the sand mill is, the more remarkable the problem is, the name is a large-area wear-resistant structure of the large-scale sand mill cylinder (document No. CN 206868346U-hereinafter referred to as document 1), brackets (5) for supporting end covers are arranged at two ends of the sand mill cylinder in the document 1, pulleys are arranged at the lower ends of the brackets, and meanwhile, rails matched with the brackets are arranged below the brackets, so that the occupied area is large.

The term "sand mill split cylinder" (document No. CN 212441444U-hereinafter referred to as document 2) is that the cylinder is designed as a first half cylinder 1 and a second half cylinder 2 which are split and detachably connected, and a layer of rigid liner 3 which is in close contact with the cylinder and a layer of flexible liner 4 which is covered on the inner side wall surface thereof are provided in the cylinder, and the cylinder is still in a complete tubular shape, so that when the rigid liner 3 and the flexible liner 4 are replaced, a stroke of axially displacing the cylinder more than the length thereof is still required.

The name of the device is a large sand mill cylinder moving device (document No. CN 206437540U-hereinafter referred to as document 3), and a solution for moving the sand mill cylinder is provided; the name of the large-flow three-eccentric-disc horizontal sand mill is "large-flow three-eccentric-disc horizontal sand mill" (document No. CN 206526876U-hereinafter referred to as document 4), the central part of the cam disc body 251 of the eccentric disc 25 provided in the document 4 is provided with a shaft hole 252, and the disc body is provided with a special-shaped hole 253, so that the grinding disc or stirring disc is a complete disc body, the assembly of the grinding disc or stirring disc and the main shaft 22 is necessarily carried out in a penetrating manner, and if the eccentric disc 25 far away from the suspending end of the main shaft 22 is worn and needs to be replaced, all the eccentric disc 25 and the rotor assembly 24 on the main shaft 22 are required to be disassembled, and the assembly efficiency is seriously affected by the scheme.

The solutions of the above documents 1, 2, 3 and 4 are all implemented by arranging the main shaft of the mill according to the cantilever beam, otherwise, if the main shaft of the mill adopts a simple beam type supporting solution, that is, the two end covers of the mill cylinder are provided with bearings for supporting the main shaft of the mill, the stress working condition of the mill shaft is improved, the volume of the mill cylinder can be further increased, and the problem is that the removal of the mill cylinder increases new difficulty and workload. Such as a horizontal sander (document No. CN 207187875U-hereinafter referred to as document 5), the spindle of document 5 is inserted into the cylinder, and both ends thereof are penetrated from the shaft hole and extend outward, and the construction scheme between the spindle and the cylinder forms a difficult problem to be overcome for replacement of wearing parts.

Another serious drawback of the prior art is the difficulty of the grinding disc assembly operation, since the grinding disc of the prior art is a complete circular disc, the assembly operation must be performed by the sleeve-type assembly of the grinding disc with the grinding shaft, for example, the grinding disc at the feed end is most susceptible to wear and the wear degree is the most serious, all the grinding discs must be removed in order to replace the grinding disc at the feed end, and the grinding disc which has not reached the replacement condition must also be removed in its entirety, which gives a huge amount of work to the maintenance of the sander.

Disclosure of Invention

The invention aims to provide a grinding disc of a sand mill and an assembly structure thereof, which improve the assembly operation efficiency of the grinding disc.

A sand mill grinding disc, characterized in that: the grinding disc is formed by half-type enclosing of a first semicircular disc and a second semicircular disc at the diameter side, a key groove is formed in the edge of an inner circular disc of the first semicircular disc and/or the second semicircular disc, and a through hole K is formed in the disc surface.

Still another object of the present invention is to provide an assembling structure of a grinding disc of a sand mill, which improves reliability and stability of the grinding disc in half-structure huff enclosing.

An assembly structure of sand mill grinding disc, its characterized in that: the grinding disc is formed by half-closing a first semicircular disc and a second semicircular disc at the diameter side to form a circular disc, a key slot is arranged on the inner circular disc edge of the first semicircular disc and/or the second semicircular disc, and a through hole K is formed in the disc surface of the grinding disc;

the grinding disc has annular raised strips or annular grooves near the inner circular arc disc, the raised edges of the annular raised strips or the notches of the annular grooves point to the outer surface of the grinding disc, the wall thickness of the end of the annular sleeve is matched with the width of the annular grooves, the end of the annular sleeve is embedded into the cavity of the annular grooves, the sleeve is arranged outside two adjacent annular sleeves in axial interval arrangement, and the sleeve is of half-half type structure.

In the technical scheme, the grinding disc is formed by connecting the half type enclosing of the first semicircular disc and the second semicircular disc, the circular sleeve and the sleeve are utilized for assembly, and the assembly and the disassembly of the grinding disc can be realized by directly carrying out half type assembly and disassembly on the corresponding shaft section positions of the main shaft of the grinding machine by the first semicircular disc and the second semicircular disc. Compared with the prior art, the integral circular grinding disc is required to be sleeved on the structural scheme of the main shaft of the grinding mill, the dismounting efficiency is greatly improved, and particularly, when a certain grinding disc with serious abrasion is replaced, only a specific grinding disc is required to be dismounted, other grinding discs are not required to be dismounted, and only the sleeve on one side of the grinding disc is required to be dismounted when the grinding disc is maintained and replaced.

Drawings

FIG. 1 is a schematic view of the invention in an exploded state;

FIGS. 2a and 2b are schematic perspective views of a first semicircular disc and a second semicircular disc, respectively;

FIG. 3 is a schematic perspective view of a sand mill in a disassembled state;

FIG. 4 is a schematic diagram of the structure of the present invention;

FIG. 5 is a cross-sectional view A-A of FIG. 4;

FIG. 6 is a schematic perspective view of the disassembled state of the present invention;

fig. 7 is an enlarged partial schematic view of fig. 6.

Detailed Description

For convenience of explanation, the following will briefly explain the basic constitution of the sand mill with reference to fig. 3:

in fig. 3, a motor is disposed in a casing 1, a reducer 2 connected with the motor is connected with one end of a main shaft 4 of a sand mill via a coupling 3, bearings are disposed on left and right bearing seats 5 and 6 disposed at left and right end frames 7 and 8 to provide a simply supported beam type rotation support for the main shaft 4 of the sand mill, a cylinder 9 is sleeved on the main shaft 4 of the sand mill, grinding discs 10 are disposed on the main shaft 4 of the sand mill in the cylinder 9 at intervals, slurry to be ground enters from a feeding end on the cylinder 9, and a discharging end discharges the ground material. In order to provide simple beam support for the main shaft 4 of the sander, left and right bearing seats 5 and 6 are required to be arranged at two ends of the main shaft 4 of the sander, if the grinding disc is continuously adopted in the prior art, namely, the grinding disc is in a monolithic circular shape, the assembly relationship between the left and right bearing seats 5 and 6 at two ends and the main shaft 4 of the sander must be firstly released, and the grinding disc 10 must be assembled and disassembled sequentially, so that the efficiency is low.

In addition, in order to further embody the dismounting efficiency of the present invention, the barrel 9 adopts a unit barrel section scheme, so that the convenience of the present application can be further presented, and regarding the scheme of designing the barrel 9 as the unit barrel section, the applicant has made detailed description in other applications of the same day application.

As shown in fig. 1 and 2, the grinding disc 10 of the sand mill is a circular disc formed by half-enclosing a first semicircular disc 10A and a second semicircular disc 10B at the diameter sides, wherein key grooves 11 are arranged on the inner circular disc edges of the first semicircular disc 10A and/or the second semicircular disc 10A, and through holes K are formed in the disc surfaces.

The above scheme is to design the grinding disc 10 as a half structure, that is, the grinding disc 10 is formed by half-enclosing a first semicircular disc 10A and a second semicircular disc 10B at the diameter sides to form a circular disc, the grinding disc 10 formed by the first semicircular disc 10A and the second semicircular disc 10B needs to rotate synchronously with the spindle 4 of the grinding mill, as shown in fig. 4, 5, 6 and 7, for this purpose, a key slot 11 is arranged on the inner circular disc edge of the first semicircular disc 10A and/or the second semicircular disc 10B, that is, a key slot 11 can be arranged on the first semicircular disc 10A or the second semicircular disc 10AB, and a key slot 11 can also be arranged on the first semicircular disc 10A and the second semicircular disc 10B, as shown in fig. 1, 2 and 7, so that the reliability of torque transmission and the uniformity of torque distribution can be improved, and slurry can be supplied through the via hole K.

The grinding disc 10 has an annular raised line or annular groove 12 on its surface adjacent to the inner circular arc edge, the raised direction of the annular raised line 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 drawing is a scheme of setting the annular groove 12, preferably, the notch of the annular groove 12 points to the surface perpendicular to the grinding disc 10. As shown in fig. 1 and 2, the first semicircular disc 10A and the second semicircular disc 10B are provided with semicircular annular grooves 12A and 12B within the semicircular arc range, and the semicircular annular grooves 12A and 12B on the first semicircular disc 10A and the second semicircular disc 10B enclose a circular annular groove 12.

The outer peripheral surface, the axial side end surface and the hole wall of the through hole K of the grinding disc 10 are provided with wear-resistant layers 13. The body of the grinding disc 10 can be made of steel with proper strength and rigidity as a built-in skeleton body, the outside is made of wear-resistant materials, the grinding disc can be disassembled and replaced when the wear-resistant layers are severely worn, and the disassembled wear parts can be repaired by the wear-resistant layers, so that the maintenance cost is reduced.

In order to ensure that the first semicircular disc 10A and the second semicircular disc 10B form a complete circular disc shape when being initially assembled, connecting lugs are arranged at two ends of the straight edges of the first semicircular disc 10A and the second semicircular disc 10B and are connected with each other. As shown in fig. 1, 2 and 7, the specific structure of the connecting lug is that a lug 14 protruding towards the straight edge surface of the second semicircular disc 10B is arranged on the end part of the straight edge surface of the first semicircular disc 10A, a connecting hole 141 perpendicular to the disc surface is arranged on the lug 14, a concave part 15 for accommodating the lug 14 is arranged on the straight edge surface of the second semicircular disc 10B, and a pin 16 passes through the connecting hole 141 and is connected with the concave part 15. In addition, the first semicircular disc 10A is provided with the lug 14 at one end and the concave portion 15 at the other end of the straight side surface, so that the first semicircular disc 10A and the second semicircular disc 10B are identical in shape, and therefore the mold quantity and spare part quantity can be reduced.

The concave portion 15 is a semicircular groove, the groove end at the outer end extends to the disc surface of one side of the second semicircular disc 10B, the inner end is arranged in the middle of the second semicircular disc 10B in the disc thickness direction, the notch forming the concave portion 15 points to the straight edge perpendicular to the second semicircular disc 10B, the second semicircular disc 10B corresponding to the inner end of the concave portion 15 is provided with a pin shaft hole 151, and the hole core of the pin shaft hole 151 is perpendicular to the disc surface of the second semicircular disc 10B. In fig. 7, the first semicircular disk 10A adapted to the second semicircular disk 10B is hidden, and the second semicircular disk 10B adapted to the first semicircular disk 10A is hidden, so that it is advantageous to show the contents of the relevant details, such as the lugs 14, the recesses 15, and the connection states of the annular sleeve 20 and the sleeve 30.

When in installation, the first semicircular disc 10A and the second semicircular disc 10B are enclosed together, and then the pin shaft 16 is used for penetrating from the pin shaft hole 151 and the connecting hole 141, so that the first semicircular disc 10A and the second semicircular disc 10 are spliced into a complete disc shape. Because the lugs 14 are horizontally arranged in the concave parts 15, when the first semicircular disk 10A and the second semicircular disk 10B are surrounded, the gaps at the straight edge parts of the whole grinding disk 10 are fine and smooth, the disk surfaces of the first semicircular disk 10A and the second semicircular disk 10B are coplanar and flush, and the integrity of the grinding disk 10 is fully ensured under the common constraint of the sleeve 30 arranged at the annular groove 12; in addition, the lug 14 and the concave portion 15 are accommodated and embedded, and the pin 16 is matched with the pin shaft hole 151 and the connecting hole 141 in a penetrating way, so that the integrity connection of the grinding disc 10 is realized, and the function of transmitting torque is also realized.

Example 2

As shown in fig. 4, 5, 6 and 7, in the assembly structure of the grinding disc of the sand mill, the grinding disc 10 is formed by half-enclosing a first semicircular disc 10A and a second semicircular disc 10B at the diameter sides to form a circular disc, key grooves 11 are arranged on the inner circular disc edges of the first semicircular disc 10A and/or the second semicircular disc 10A, and through holes K are formed on the disc surfaces of the grinding disc 10; the grinding disc 10 has annular raised strips or annular grooves 12 near the inner circular arc disc, the raised direction of the annular raised strips or the notch of the annular groove 12 points to the outer part of the grinding disc 10, the wall thickness of the end part of the annular sleeve 20 is matched with the groove width of the annular groove 12, the end part of the annular sleeve 20 is embedded in the groove cavity of the annular groove 12, and the sleeve 30 is arranged outside the two adjacent annular sleeves 20 which are axially arranged at intervals and has a half-half structure of the first sleeve 30A and the second sleeve 30B.

Preferably, the sleeve holes in the middle of the circular sleeve 20 are connected with the mill shaft 4 by a key, the periphery of the circular sleeve 20 is provided with a convex ring protruding axially and embedded in the groove cavity of the annular groove 12, the pipe cavity of the sleeve 30 is a stepped hole with large ends and small middle sections, the pipe end sections with large aperture are sleeved on the periphery of the circular sleeve 20, the two ends of the small pipe diameter sections are propped against the opposite side end surfaces of the two circular sleeves 20, and the two ends of the sleeve 30 are propped against the opposite disc surfaces of the two adjacent grinding discs 10.

The wall thickness of the end part of the annular sleeve 20 is matched with the groove width of the annular groove 12 so that the end part of the annular sleeve 20 is embedded in the groove cavity of the annular groove 12, and the first semicircular disc 10A and the second semicircular disc 10B always keep the shape of the complete annular disc under the constraint of the annular sleeve 20. In order to avoid the exposure of the annular sleeve 20 to the slurry, the sleeve 30 is arranged outside the two adjacent annular sleeves 20 which are axially arranged at intervals, as shown in fig. 4, 6 and 7, specifically, the sleeve 30 is formed by half structures of a first sleeve half body 30A and a second sleeve half body 30B, namely, the ends of the first sleeve half body 30A and the second sleeve half body 30B at the half joint of the first sleeve half body and the second sleeve half body are detachably connected by bolts, the first sleeve half body 30A and the second sleeve half body 30B enclose the adjacent annular sleeves 20 at fixed intervals, only the outer wall of the sleeve 30 formed by the half bodies 30A and the half sleeve half body 30B in a hash way is exposed to the slurry, and therefore, only the outer peripheral wall surfaces of the first sleeve half body 30A and the half sleeve half body 30B are additionally provided with wear-resistant layers, and two ends of the first sleeve half body 30A and the second sleeve half body 30B are directly attached to the grinding disc 10.

The sleeve 30 isolates the annular sleeve 20 from slurry, the annular sleeve 20 is not worn and is not required to be replaced, the annular sleeve 20 is sleeved on the grinding machine shaft 4 during initial assembly, the assembly workload is reduced, the replacement workload of worn parts is also reduced, the sleeve 30, the annular sleeve 20 and the grinding disc 10 are matched, the problems of axial positioning and limiting of the grinding disc 10 are solved, the processing workload of the grinding machine shaft 4 is simplified, and the sleeve 30 simultaneously applies radial constraint to the two halves of the first semicircular disc 10A and the second semicircular disc 10B of the grinding disc 10, so that the reliable integrity of the grinding disc 10 is ensured.

In order to ensure that the annular sleeve 20 and the mill shaft 4 synchronously rotate, key grooves are also arranged on the inner pipe wall of the sleeve 30 and form key connection with keys 4a on the mill shaft 4, the sleeves 30 are connected by bolts 31, and the first sleeve half body 30A and the second sleeve half body 30B are connected in a surrounding manner to form a complete and reliable sleeve 30.

Claims (9)

1. A sand mill grinding disc, characterized in that: the grinding disc (10) is formed by half-type enclosing of a first semicircular disc (10A) and a second semicircular disc (10B) at the diameter side, a key groove (11) is formed in the inner circular arc edge of the first semicircular disc (10A) and/or the second semicircular disc (10A), and a through hole K is formed in the disc surface.

2. A sand mill grinding disc according to claim 1, characterized in that: an annular raised line or an annular groove (12) is arranged on the surface of the grinding disc (10) adjacent to the edge of the inner circular arc disc, and the protruding direction of the annular raised line or the notch of the annular groove (12) is directed to the outside of the surface of the grinding disc (10).

3. A sand mill grinding disc according to claim 2, characterized in that: the notch of the annular groove (12) points to be perpendicular to the disk surface of the grinding disk (10).

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

5. A sand mill grinding disc according to claim 1, characterized in that: the two ends of the straight sides of the first semicircular disc (10A) and the second semicircular disc (10B) are provided with connecting lugs which are connected with each other.

6. A sand mill grinding disc according to claim 5, characterized in that: the end part of the straight side surface of the first semicircular disc (10A) is provided with a lug (14) protruding towards the straight side surface of the second semicircular disc (10B), the lug (14) is provided with a connecting hole (141) perpendicular to the disc surface, the straight side surface of the second semicircular disc (10B) is provided with a concave part (15) for accommodating the lug (14), and a pin shaft (16) penetrates through the connecting hole (141) and is connected with the concave part (15).

7. A sand mill grinding disc according to claim 5 or 6, characterized in that: the concave part (15) is a semicircular groove, the outer end groove end of the concave part extends to the middle part of the second semicircular disc (10B) in the disc thickness direction of the second semicircular disc (10B), the notch forming the concave part (15) points to the straight edge perpendicular to the second semicircular disc (10B), the second semicircular disc (10B) corresponding to the inner end of the concave part (15) is provided with a pin shaft hole (151), and the hole core of the pin shaft hole (151) is perpendicular to the disc surface of the second semicircular disc (10B).

8. An assembly structure of sand mill grinding disc, its characterized in that: the grinding disc (10) is formed by half enclosing a first semicircular disc (10A) and a second semicircular disc (10B) at the diameter side to form a circular disc, a key slot (11) is arranged on the inner circular arc disc edge of the first semicircular disc (10A) and/or the second semicircular disc (10A), and a through hole K is formed in the disc surface of the grinding disc (10);

the grinding disc (10) is provided with annular raised strips or annular grooves (12) on the disc surface adjacent to the inner circular arc disc edge, the raised direction of the annular raised strips or the notch of the annular groove (12) points to the outside of the disc surface of the grinding disc (10), the end wall thickness of the annular sleeve (20) is matched with the groove width of the annular groove (12), the end part of the annular sleeve (20) is embedded in the groove cavity of the annular groove (12), two adjacent annular sleeves (20) which are axially arranged at intervals are externally provided with sleeves (30), and each sleeve (30) is of a half-type structure of a first sleeve half body and a second sleeve half body (30A and 30B).

9. The assembling structure of the grinding disc of the sand mill according to claim 1, characterized in that: the sleeve hole in the middle of the circular sleeve (20) is connected with the grinder shaft (4) through a key, the periphery of the circular sleeve (20) is provided with an axially protruding convex ring which is embedded in a groove cavity of the annular groove (12), the pipe cavity of the sleeve (30) is a stepped hole with large two ends and small middle section, the pipe end section with large aperture is sleeved on the periphery of the circular sleeve (20), the two ends of the small pipe diameter section are propped against the opposite side end surfaces of the two circular sleeves (20), and the two ends of the sleeve (30) are propped against the opposite disk surfaces of the two adjacent grinding disks (10).