Ball milling device for perlite processing

Abstract

The utility model discloses a ball milling device for perlite processing, which comprises a cylinder body and a support frame, one end of the cylinder body is provided with a feed pipe, the other end of the cylinder body is provided with a discharge pipe, the feed pipe and the discharge pipe are both installed on the support frame through a bearing seat, a guide vane is arranged in the feed pipe, a spiral flow guide cavity is formed between the guide vane and the feed pipe, and the spiral flow guide cavity is communicated with the feed pipe. A plurality of lining plates are arranged on the inner wall of the barrel in an annular array mode, sliding installation structures are arranged between the lining plates and the inner wall of the barrel, sliding limiting structures are arranged between every two adjacent lining plates, heat dissipation fins are embedded in the side wall of the barrel, the inner ends of the heat dissipation fins are attached to the lining plates, the outer ends of the heat dissipation fins extend to the outer side of the barrel, and cooling structures are arranged. According to the utility model, the ball-milling stability can be improved, pearls are prevented from reversely entering the feeding pipe in the ball-milling process, meanwhile, the lining plate is convenient to replace, the use stability of the lining plate is improved, and the heat dissipation and cooling effects of the pearls in the ball-milling process are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pearlite processing, and more specifically, to a ball milling device for pearlite processing. Background Art

[0002] Perlite is a special building material with the characteristics of light weight, fire resistance, heat insulation, sound insulation, flame retardancy, etc. It is widely used in the construction industry. In the production and processing of perlite, it needs to go through ore mining, ore crushing, drying, alkali washing, fine grinding, particle screening, sintering, cutting, surface treatment, packaging and other processes;

[0003] Among them, fine grinding is to further crush the perlite ore after it has been crushed, so that the particles of perlite can be made smaller. This process can be carried out by a ball mill.

[0004] When the ball mill drum is grinding the perlite material, since the feed channel on the feed shaft is connected to the cavity inside the ball mill drum, the perlite material may reversely enter the feed pipe through the feed channel during the grinding process and overflow.

[0005] In addition, a wear-resistant lining structure is arranged inside the cylinder of the ball mill to protect the cylinder of the ball mill and adjust the motion state of the grinding body. However, the existing wear-resistant lining of the ball mill is mainly installed inside the ball mill as a whole, which is not convenient for replacement. Moreover, the lining structure that is partially installed inside the ball mill is mostly locked and fixed with the cylinder of the ball mill by bolts, and the installation stability is poor.

[0006] In addition, during the process of grinding perlite materials through a ball mill, there will be constant collision and friction between the internal grinding balls and the perlite materials, and between the perlite materials and the liner, which will cause the internal temperature to rise. Therefore, technology is needed to dissipate heat and cool the interior of the ball mill to avoid excessive internal temperature of the ball mill. Utility Model Content

[0007] In view of the problems existing in the prior art, the utility model provides a ball mill for perlite processing to solve the technical problems mentioned in the background technology that, during the ball milling process of perlite, the perlite material is easy to reversely enter the feed pipe, the liner is not easy to replace, and the heat dissipation is difficult.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A ball milling device for processing perlite comprises a cylinder and a support frame, a feed pipe is provided at one end of the cylinder, and a discharge pipe is provided at the other end, the feed pipe and the discharge pipe are both mounted on the support frame through a bearing seat, a guide blade is provided in the feed pipe, a spiral guide cavity is formed between the guide blade and the feed pipe, a plurality of lining plates are provided in a circular array on the inner wall of the cylinder, a sliding mounting structure is provided between the lining plates and the inner wall of the cylinder, a sliding limiting structure is provided between two adjacent lining plates, a cooling fin is embedded on the side wall of the cylinder, the inner end portion of the cooling fin is fitted with the lining plate, and the outer end portion extends to the outside of the cylinder, a cooling structure is provided on the outside of the cooling fin, a rack is provided on the outside of the cylinder, and a rotating drive structure is provided on the outside of the cylinder in coordination with the rack.

[0010] The utility model is further configured such that the rotation drive structure includes a motor, a gear is provided at the output end of the motor, the gear is meshed with a rack, the rotation of the gear can be controlled by the motor, and the rotation of the cylinder can be controlled by the meshing between the gear and the rack, thereby realizing the rotation drive of the cylinder and the liner during the perlite processing process.

[0011] The utility model is further configured such that the sliding installation structure includes a mounting strip, and a mounting groove is cooperatively provided on the inner wall of the cylinder. The mounting strip is limitedly slidably installed in the mounting groove. When the liner is installed, the mounting strip on the liner is limitedly slid into the interior of the mounting groove. In this way, the liner can be accurately and stably installed in a limited position inside the cylinder, thereby improving the installation accuracy and stability of the liner inside the cylinder.

[0012] The utility model is further configured such that the sliding limit structure includes a limit bar, which is arranged on one side of each of the lining plates, and a limit groove is opened on the other side of the lining plate. The limit bar slides in the limit groove, and during installation, the limit bar slides into the limit groove, so that mutual limitation between two adjacent groups of lining plates can be achieved, thereby further improving the installation stability of the lining plates inside the cylinder.

[0013] The utility model is further configured that the surface of some of the lining plates is provided with convex strips, and the convex strips are evenly distributed inside the cylinder. The setting of the convex strips can better carry the spheres located inside the cylinder and the perlite material can be turned and impacted inside the cylinder, thereby improving the ball milling effect of the perlite during the production and processing process.

[0014] The utility model is further configured such that the cooling structure includes a mounting frame, wherein the mounting frame is arranged between the two groups of support frames, and a plurality of air coolers are evenly arranged on the mounting frame. The air coolers can be stably installed through the mounting frame. At the same time, the air coolers can blow cold air to the heat dissipation fins to cool the heat dissipation fins, thereby improving the heat dissipation and cooling effect of the heat dissipation fins, ensuring the stability of the perlite material inside the cylinder during grinding, and avoiding excessive temperature.

[0015] The utility model is further configured such that a heat dissipation channel is formed between two adjacent heat dissipation fins, and the air cooler discharges air toward the heat dissipation channel. In this way, the air flow blown out by the air cooler will flow in one direction in the heat dissipation channel, thereby taking away the heat on the heat dissipation fins, thereby improving the heat dissipation effect of the heat dissipation fins, and further increasing the heat dissipation effect of the perlite inside the cylinder during grinding, thereby preventing the temperature inside the cylinder from being too high.

[0016] The utility model is further configured as follows: a countersunk groove is provided on the lining plate, a fixing groove is provided on the cylinder body, a fixing bolt is provided in the countersunk groove, the inner end of the fixing bolt passes through the countersunk groove and is threadedly locked with the fixing groove. When in use, the fixing bolt is passed through the countersunk groove and threadedly screwed into the fixing groove. In this way, the connection and fixation between the lining plate and the cylinder body can be achieved, and at the same time, the disassembly of the lining plate in the cylinder body is facilitated.

[0017] Compared with the prior art, the utility model provides a ball milling device for pearlite processing, which has the following beneficial effects:

[0018] 1. The utility model provides guide blades in the feed pipe, and forms a spiral guide cavity between the guide blades and the feed pipe. In this way, when feeding, the cylinder drives the feed pipe to rotate, and the feed pipe drives the guide blades to rotate. Under the action of the spiral guide cavity, the perlite material can enter the cylinder evenly and stably, and contact with the liner and grinding balls inside the cylinder to achieve grinding. In this case, due to the unidirectional guide effect of the spiral guide cavity under unidirectional rotation, the perlite material can be prevented from reversely entering the feed pipe during the grinding process.

[0019] 2. The utility model arranges multiple groups of lining plates in an annular array inside the cylinder, and the lining plates and the cylinder are installed by the cooperation of the installation groove and the installation strip, and the two adjacent groups of lining plates are installed by the cooperation of the limit strip and the limit groove, and finally the fixing bolts are screwed into the fixing groove through the sink groove to achieve fixation, so that the lining plates are easily installed and removed inside the cylinder, the convenience of installation and replacement of the lining plates is improved, and the stability during use is improved. In this process, when the lining plates are installed, the lining plates are firstly made to carry The corresponding mounting strip is limited and slides into the corresponding mounting groove, and then the adjacent lining plate carries the mounting strip into the corresponding mounting groove, and at the same time the limiting strip on the side of the lining plate enters the corresponding limiting groove. In this way, through the cooperation between the mounting groove and the mounting strip and the cooperation between the limiting groove and the limiting strip, double limiting of the lining plate during installation can be achieved, thereby improving the installation stability of the lining plate inside the cylinder body and facilitating the disassembly of the lining plate. Afterwards, the fixing bolt is passed through the corresponding countersunk groove and screwed into the corresponding fixing groove to lock and fix the lining plate inside the cylinder body.

[0020] 3. In the utility model, heat dissipation fins are embedded in the cylinder. During use, due to the mutual collision and friction between the internal sphere and the pearlite material, heat will be generated inside the cylinder, causing the temperature of the perlite to rise. The heat will be transferred along the lining and outward through the heat dissipation fins. When the air cooler is started, the cold air blown by the air cooler will flow in one direction in the heat dissipation channel, thereby taking away the heat on the heat dissipation fins, thereby improving the heat dissipation effect of the heat dissipation fins, and further increasing the heat dissipation effect of the perlite inside the cylinder during grinding, preventing the internal temperature of the cylinder from being too high, and achieving the effect of timely heat dissipation of the perlite during ball milling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The overall structure of a ball mill for processing pearlite in the utility model is shown in FIG. Figure 1 ;

[0022] Figure 2 The overall structure of a ball mill for processing pearlite in the utility model is shown in FIG. Figure 2 ;

[0023] Figure 3 It is a schematic diagram of the connection structure between the cylinder and the liner in the utility model;

[0024] Figure 4 It is a schematic diagram of the local connection structure between the cylinder and the liner in the utility model;

[0025] Figure 5 It is a schematic cross-sectional view of the internal structure of the feed pipe in the utility model.

[0026] In the figure: 1. Cylinder; 2. Support frame; 3. Feed pipe; 4. Discharge pipe; 5. Guide blade; 6. Spiral guide chamber; 7. Lining plate; 8. Heat dissipation fin; 9. Rack; 10. Motor; 11. Gear; 12. Mounting strip; 13. Mounting groove; 14. Limiting strip; 15. Limiting groove; 16. Raised strip; 17. Mounting frame; 18. Air cooler; 19. Heat dissipation channel; 20. Sink; 21. Fixing groove; 22. Fixing bolt. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0029] In the present invention, unless otherwise specified, directions such as "up" and "down" are usually used in reference to the directions shown in the drawings, or in reference to the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "left" and "right" are usually used in reference to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0030] See also Figure 1-Figure 5 A ball milling device for processing perlite comprises a cylinder 1 and a support frame 2, a feed pipe 3 is arranged at one end of the cylinder 1, and a discharge pipe 4 is arranged at the other end, the feed pipe 3 and the discharge pipe 4 are both mounted on the support frame 2 through a bearing seat, a guide blade 5 is arranged in the feed pipe 3, a spiral guide cavity 6 is formed between the guide blade 5 and the feed pipe 3, a plurality of lining plates 7 are arranged in a circular array on the inner wall of the cylinder 1, a sliding mounting structure is arranged between the lining plates 7 and the inner wall of the cylinder 1, a sliding limiting structure is arranged between two adjacent lining plates 7, a heat dissipation fin 8 is embedded on the side wall of the cylinder 1, the inner end portion of the heat dissipation fin 8 is fitted with the lining plate 7, and the outer end portion extends to the outside of the cylinder 1, a cooling structure is arranged on the outside of the heat dissipation fin 8, a rack 9 is arranged on the outside of the cylinder 1, and a rotation driving structure is arranged on the outside of the cylinder 1 in cooperation with the rack 9.

[0031] The utility model provides a guide blade 5 in the feed pipe 3, and forms a spiral guide cavity 6 between the guide blade 5 and the feed pipe 3. In this way, when feeding, the cylinder 1 drives the feed pipe 3 to rotate, and the feed pipe 3 drives the guide blade 5 to rotate. Under the action of the spiral guide cavity 6, the perlite material can enter the cylinder 1 evenly and stably, and contact with the liner 7 and the grinding ball inside the cylinder 1 to achieve grinding. In this case, due to the unidirectional guide effect of the spiral guide cavity 6 under the condition of unidirectional rotation, the perlite material can be prevented from reversely entering the feed pipe 3 during the grinding process.

[0032] The utility model arranges multiple groups of lining plates 7 in an annular array inside the cylinder 1, and the lining plates 7 are installed with the cylinder 1 through the cooperation and limitation of the installation grooves 13 and the installation strips 12, and the two adjacent groups of lining plates 7 are installed with the cooperation and limitation of the limiting strips 14 and the limiting grooves 15, and finally the fixing bolts 22 are screwed into the fixing grooves 21 through the sink grooves 20 to achieve fixation, so that the lining plates 7 are stably installed and conveniently disassembled inside the cylinder 1, the convenience of installation and replacement of the lining plates 7 is improved, and the stability during use is improved. In this process, when the lining plates 7 are installed, the lining plates 7 are firstly made to carry the corresponding installation strips. 12 limited sliding into the corresponding installation groove 13, then, the adjacent lining plate 7 carrying the installation strip 12 enters the corresponding installation groove 13, and at the same time, the limiting strip 14 on the side of the lining plate 7 enters the corresponding limiting groove 15, so that the lining plate 7 can be double limited during installation through the cooperation of the installation groove 13 and the installation strip 12, and the cooperation of the limiting groove 15 and the limiting strip 14, thereby improving the installation stability of the lining plate 7 inside the cylinder 1 and facilitating the removal of the lining plate 7, and then, the fixing bolt 22 is passed through the corresponding sink groove 20 and screwed into the corresponding fixing groove 21 to lock and fix the lining plate 7 inside the cylinder 1;

[0033] In the utility model, heat dissipation fins 8 are embedded on the cylinder 1. During use, due to the mutual collision and friction between the internal sphere and the pearl material, heat will be generated inside the cylinder 1, which will increase the temperature of the perlite. The heat will be transferred along the lining plate 7 and transferred outward through the heat dissipation fins 8. The air cooler 18 will be started, and the cold air blown by the air cooler 18 will flow in one direction in the heat dissipation channel 19, so as to take away the heat on the heat dissipation fins 8, thereby improving the heat dissipation effect of the heat dissipation fins 8, and further increasing the heat dissipation effect of the perlite inside the cylinder 1 during grinding, preventing the internal temperature of the cylinder 1 from being too high, and achieving the effect of timely heat dissipation of the perlite during ball milling.

[0034] See also Figure 1-Figure 5As an implementation of the rotation drive structure: the rotation drive structure includes a motor 10, and a gear 11 is provided at the output end of the motor 10. The gear 11 is meshed with the rack 9. The motor 10 can control the rotation of the gear 11, and the meshing between the gear 11 and the rack 9 can control the rotation of the cylinder 1, thereby realizing the rotation drive of the cylinder 1 and the liner 7 during the perlite processing process.

[0035] See also Figure 1-Figure 5 As an implementation of the sliding installation structure: the sliding installation structure includes a mounting strip 12, and a mounting groove 13 is provided on the inner wall of the cylinder 1. The mounting strip 12 is limitedly slidably installed in the mounting groove 13. When the liner 7 is installed, the mounting strip 12 on the liner 7 is limitedly slid into the interior of the mounting groove 13. In this way, the liner 7 can be accurately and stably installed in a limited position inside the cylinder 1, thereby improving the installation accuracy and stability of the liner 7 inside the cylinder 1.

[0036] See also Figure 1-Figure 5 As an implementation of the sliding limit structure: the sliding limit structure includes a limit strip 14, the limit strip 14 is arranged on one side of each lining plate 7, and a limit groove 15 is opened on the other side of the lining plate 7. The limit strip 14 is limited and slides in the limit groove 15. During installation, the limit strip 14 slides into the limit groove 15, so that the mutual limitation between the two adjacent groups of lining plates 7 can be achieved, thereby further improving the installation stability of the lining plate 7 inside the cylinder 1.

[0037] See also Figure 1-Figure 5 As an implementation of the partial lining 7: the surface of the partial lining 7 is provided with convex strips 16, and the convex strips 16 are evenly distributed inside the cylinder 1. The setting of the convex strips 16 can better carry the sphere inside the cylinder 1 and the flipping and collision of the perlite material in the cylinder 1, thereby improving the ball milling effect of the perlite during the production and processing process.

[0038] See also Figure 1-Figure 5 As an implementation of the cooling structure: the cooling structure includes a mounting frame 17, the mounting frame 17 is arranged between the two groups of support frames 2, and a plurality of air coolers 18 are evenly arranged on the mounting frame 17. The air coolers 18 can be stably installed through the mounting frame 17. At the same time, the air coolers 18 can blow cold air to the heat dissipation fins 8 to cool the heat dissipation fins 8, improve the heat dissipation and cooling effect of the heat dissipation fins 8, ensure the stability of the perlite material inside the cylinder 1 during grinding, and avoid excessive temperature.

[0039] See also Figure 1-Figure 5As an implementation method of the heat dissipation fins 8: a heat dissipation channel 19 is formed between two adjacent heat dissipation fins 8, and the air cooler 18 blows air toward the heat dissipation channel 19. In this way, the air flow blown by the air cooler 18 will flow in one direction in the heat dissipation channel 19, thereby taking away the heat on the heat dissipation fins 8, thereby improving the heat dissipation effect of the heat dissipation fins 8, and further increasing the heat dissipation effect of the perlite inside the cylinder 1 during grinding, thereby preventing the temperature inside the cylinder 1 from being too high.

[0040] See also Figure 1-Figure 5 As an implementation method of the lining plate 7: a sink groove 20 is provided on the lining plate 7, and a fixing groove 21 is provided on the cylinder 1. A fixing bolt 22 is provided in the sink groove 20. The inner end of the fixing bolt 22 passes through the sink groove 20 and is threadedly locked with the fixing groove 21. When in use, the fixing bolt 22 is passed through the sink groove 20 and is threadedly tightened in the fixing groove 21. In this way, the connection and fixation between the lining plate 7 and the cylinder 1 can be achieved, and at the same time, the lining plate 7 is easy to disassemble in the cylinder 1.

[0041] In summary:

[0042] During feeding, the cylinder 1 drives the feed pipe 3 to rotate, and the feed pipe 3 drives the guide blade 5 to rotate. Under the action of the spiral guide cavity 6, the perlite material can enter the cylinder 1 evenly and stably, and contact with the liner 7 and the grinding balls inside the cylinder 1 to achieve grinding. In this case, due to the unidirectional flow guide effect of the spiral guide cavity 6 under unidirectional rotation, the perlite material can be prevented from reversely entering the feed pipe 3 during the grinding process.

[0043] During use, due to the mutual collision and friction between the internal sphere and the pearl material, heat will be generated inside the cylinder 1, causing the temperature of the perlite to rise. The heat will be transferred along the lining plate 7 and transferred outward through the heat dissipation fins 8. The air cooler 18 will be started, and the cold air blown by the air cooler 18 will flow in one direction in the heat dissipation channel 19, thereby taking away the heat on the heat dissipation fins 8, thereby improving the heat dissipation effect of the heat dissipation fins 8, and then increasing the heat dissipation effect of the perlite inside the cylinder 1 during grinding, preventing the internal temperature of the cylinder 1 from being too high, and achieving the effect of timely heat dissipation of the perlite during ball milling;

[0044] When the utility model realizes the installation of the lining plate 7, the lining plate 7 is firstly made to carry the corresponding installation strip 12 to slide into the corresponding installation groove 13 with limited position, and then, the adjacent lining plate 7 is made to carry the installation strip 12 to enter the corresponding installation groove 13, and at the same time, the limiting strip 14 on the side of the lining plate 7 is made to enter the corresponding limiting groove 15, so that the lining plate 7 can be double limited during installation through the cooperation between the installation groove 13 and the installation strip 12 and the cooperation between the limiting groove 15 and the limiting strip 14, thereby improving the installation stability of the lining plate 7 inside the cylinder 1 and facilitating the disassembly of the lining plate 7, and then, the fixing bolt 22 is passed through the corresponding countersunk groove 20 and screwed into the corresponding fixing groove 21 to lock and fix the lining plate 7 inside the cylinder 1.

[0045] In all the schemes mentioned above, the connection between two parts can be selected according to the actual situation by welding, bolt and nut matching connection, bolt or screw connection or other well-known connection methods, which will not be described one by one here. In the above, all fixed connections are preferably considered to be welding. Although the embodiments of the utility model have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the utility model. The scope of the utility model is defined by the attached claims and their equivalents;

[0046] In all the schemes mentioned above, if there is no clear description, the operation of electrical components is controlled by the controller. Since the devices matched with the controller are common devices, their control principles and line connections are all well-known and mature technologies, and their electrical connection relationships and specific circuit structures are not described here.

[0047] In all the schemes mentioned above, the motor involved can be matched with a reducer if necessary. The connection structure and working principle between the motor and the reducer are existing well-known technologies, and the utility model will not elaborate on them.

[0048] Among all the solutions mentioned above, those involving the connection between solar panels and batteries can be equipped with necessary accessories such as inverters, battery charging controllers, cables, fuses, and brackets. Their control principles and line connections are all well-known and mature technologies, and their electrical connection relationships and specific circuit structures will not be described in detail here.

Claims

1. A ball mill for processing pearlite, comprising a barrel (1) and a support frame (2), wherein one end of the barrel (1) is provided with a feed pipe (3), and the other end is provided with a discharge pipe (4), wherein both the feed pipe (3) and the discharge pipe (4) are mounted on the support frame (2) via a bearing seat, wherein: A guide blade (5) is arranged in the feed pipe (3), and a spiral guide cavity (6) is formed between the guide blade (5) and the feed pipe (3). A plurality of lining plates (7) are arranged in an annular array on the inner wall of the cylinder (1), and a sliding mounting structure is arranged between the lining plates (7) and the inner wall of the cylinder (1). The sliding mounting structure comprises a mounting strip (12), and a mounting groove (13) is provided on the inner wall of the cylinder (1). The mounting strip (12) is limitedly slidably mounted in the mounting groove (13), and a sliding limiting structure is arranged between two adjacent lining plates (7). The sliding limiting structure comprises: A limit bar (14), the limit bar (14) being arranged on one side of each of the lining plates (7), the other side of the lining plates (7) being provided with a limit groove (15), the limit bar (14) being limited and sliding in the limit groove (15), a heat dissipation fin (8) being embedded on the side wall of the cylinder (1), the inner end of the heat dissipation fin (8) being in contact with the lining plates (7), and the outer end extending to the outside of the cylinder (1), a cooling structure being arranged on the outside of the heat dissipation fin (8), a rack (9) being arranged on the outside of the cylinder (1), and a rotation driving structure being arranged on the outside of the cylinder (1) in coordination with the rack (9).

2. A ball mill for pearlite processing according to claim 1, characterized in that: The rotation drive structure comprises a motor (10), an output end of the motor (10) is provided with a gear (11), and the gear (11) is meshed with a rack (9).

3. A ball mill for pearlite processing according to claim 1, characterized in that: The surface of some of the lining plates (7) is provided with convex strips (16), and the convex strips (16) are evenly distributed inside the cylinder (1).

4. A ball mill for pearlite processing according to claim 1, characterized in that: The cooling structure comprises a mounting frame (17), wherein the mounting frame (17) is arranged between two groups of support frames (2), and a plurality of cooling fans (18) are evenly arranged on the mounting frame (17).

5. A ball mill for processing pearlite according to claim 4, characterized in that: A heat dissipation channel (19) is formed between two adjacent heat dissipation fins (8), and the air cooler (18) discharges air toward the heat dissipation channel (19).

6. A ball mill for processing pearlite according to any one of claims 1 to 5, characterized in that: The lining plate (7) is provided with a sink groove (20), and the cylinder (1) is provided with a fixing groove (21) in cooperation therewith. A fixing bolt (22) is arranged in the sink groove (20), and the inner end of the fixing bolt (22) passes through the sink groove (20) and is thread-locked with the fixing groove (21).

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