Spheroidizing agent crushing and grinding device
By designing a spheroidizer crushing and grinding device in the composite motion mode, combined with a grading system of filter mesh and filter pores, the problems of uneven grinding of spheroidizer particles and incomplete filtration in the prior art are solved, efficient particle crushing and uniform grinding are achieved, and product quality and production efficiency are improved.
Patent Information
- Application Number
- CN202411880228.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-03-18
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing spheroidizer crushing devices are difficult to achieve effective control and uniform grinding of spheroidizer particles, and lack effective filtration and grading mechanisms, resulting in the mixing of large-particle materials with incompletely broken materials, affecting product quality, and it is easy to block the conveying channel during material transportation, increasing the difficulty of cleaning and reducing production efficiency.
A spheroidizer crushing and grinding device is designed, using material crushing components and plate body lifting components. The crushing plate is crushed through a composite motion mode (upper and down linear motion and rotation), and the particles are sorted and removed through the filter mesh and filter holes to ensure that the particles reach the required particle size.
Through the crushing plate and filtration system in the composite motion mode, efficient crushing and uniform grinding of spheroidizer particles is achieved, ensuring the improvement of product quality. Through an effective filtration and grading mechanism, the mixing of large-particle materials and incompletely broken materials is avoided, the risk of congestion of conveying channels is reduced, and the production efficiency is improved.
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Figure CN119633964A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of spheroidizing agent crushing, in particular to a spheroidizing agent crushing and grinding device. Background Art
[0002] The additive that makes the graphite in cast iron crystallize into spheres is called a spheroidizer. The main components of the spheroidizer are spheroidizing elements, such as magnesium and calcium. The spheroidal graphite in ductile iron is formed by spheroidizing the cast iron liquid, which makes its strength much higher than that of gray cast iron and its toughness better than that of malleable cast iron, while maintaining a series of advantages of gray cast iron.
[0003] In the existing related technologies, spheroidizer crushing devices mostly use a single crushing method, such as static pressure crushing or impact crushing. These methods are difficult to achieve effective control and uniform grinding of spheroidizer particles. In addition, due to the lack of effective filtering and grading mechanisms, large particles are often mixed with incompletely crushed materials, affecting the quality of the final product. Furthermore, during the material transportation process, residual materials are prone to remain on the inner wall of the pipeline. Long-term accumulation will block the transportation channel, increase the difficulty of cleaning, and reduce production efficiency. Summary of the invention
[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a spheroidizing agent crushing and grinding device to at least partially solve the above technical problems.
[0005] The technical solution adopted by the present invention is as follows: The present invention provides a spheroidizing agent crushing and grinding device, comprising: a material crushing assembly, comprising a crushing plate, an arc-shaped top plate, an arc-shaped bottom plate, a fixing plate and an extension rod, wherein a mounting hole is opened on the surface of the crushing plate, the arc-shaped top plate and the arc-shaped bottom plate are arranged inside the mounting hole, the fixing plate is arranged inside the arc-shaped bottom plate, and the extension rod is arranged inside the arc-shaped top plate; The plate lifting assembly comprises a connecting rod, a fixing rod, a buffer damping rod and a sliding block, wherein one end of the connecting rod is arranged on the outer side of the crushing plate, the sliding block is arranged on the other end of the connecting rod, the fixing rod is passed through the interior of the connecting rod, and the buffer damping rod is arranged on both sides of the sliding block.
[0006] In one embodiment of the present invention, the spheroidizer crushing and grinding device also includes: a working cylinder, a driving motor is provided inside the working cylinder, a rotating shaft is provided at the output end of the driving motor, bearing seats are provided on both sides of the rotating shaft, a fixed frame is provided on the side wall of the rotating shaft, and the plate lifting assembly is arranged inside the fixed frame.
[0007] In one embodiment of the present invention, limiting grooves are provided inside the arc-shaped top plate and the arc-shaped bottom plate, the fixing plate is arranged inside the limiting groove of the arc-shaped bottom plate, the extension rod is arranged inside the limiting groove of the arc-shaped bottom plate, and a rotating rod is passed through the extension rod; a plurality of groups of filter holes are provided on the bottom surface of the crushing plate, and a filter net is provided inside the crushing plate.
[0008] In one embodiment of the present invention, an electric retractor is provided inside the fixed frame, and an output end of the electric retractor is provided on the outer wall of the crushing plate, driving the crushing plate to slide up and down on the surface of the rotating shaft.
[0009] In one embodiment of the present invention, an L-shaped feed pipe is provided on the outer side of the working cylinder, and two groups of the L-shaped feed pipe are provided. Protective covers are provided at the top ends of the two groups of L-shaped feed pipes.
[0010] In one embodiment of the present invention, an L-shaped fixing column is further provided on the outer side of the working cylinder, and four groups of L-shaped fixing columns are provided. The bottom surfaces of the four groups of L-shaped fixing columns are all provided with anti-wear pads, and the bottom surfaces of the anti-wear pads are provided with anti-slip grooves.
[0011] In one embodiment of the present invention, a control panel is further provided on the outer side of the working cylinder, and the control panel is electrically controlled and connected to the electric telescopic device, the driving motor and the material extraction pump through conductive wires.
[0012] In one embodiment of the present invention, a material extraction pump is provided at the bottom of the inner cavity of the working cylinder, a material delivery pipe is provided at the output end of the material extraction pump, and the other end of the material delivery pipe is provided above the material crushing assembly.
[0013] In one embodiment of the present invention, a fixed sleeve is provided inside the feed pipe, a fixed block is provided above the fixed sleeve, an L-shaped limiting rod is provided on one side of the fixed block, a cleaning plate is provided inside the fixed sleeve, and the other end of the L-shaped limiting rod is provided on the top surface of the cleaning plate.
[0014] The beneficial effects of the technical solution of the present invention are: The crushing plate moves up and down linearly driven by the plate lifting assembly, and rotates inside the working cylinder driven by the rotating shaft, so as to realize the composite motion mode of the crushing plate; and when the spheroidizer enters the crushing plate, the filter screen can remove the spheroidizer with smaller particle size from the arc bottom plate on the other side and the filter holes at the bottom of the crushing plate, while the spheroidizer with larger particle size continues to be subjected to the axial force and extrusion force inside the crushing plate, and is continuously crushed and ground until the required particle size is reached.
[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 A schematic structural diagram of a material crushing assembly of a spheroidizing agent crushing and grinding device according to an embodiment of the present invention; Figure 2 A schematic structural diagram of a plate lifting assembly of a spheroidizing agent crushing and grinding device according to an embodiment of the present invention; Figure 3 A schematic diagram of the structure of a spheroidizing agent crushing and grinding device according to an embodiment of the present invention; Figure 4 It is a front view of the spheroidizing agent crushing and grinding device proposed in an embodiment of the present invention; Figure 5 A top view of a spheroidizing agent crushing and grinding device according to an embodiment of the present invention; Figure 6 A side view of a spheroidizing agent crushing and grinding device according to an embodiment of the present invention; Figure 7 for Figure 4 A cross-sectional view along the cutting line AA; Figure 8 for Figure 5 A cross-sectional view along the cutting line BB; Fig. 9 for Figure 6 A cross-sectional view along the cutting line CC; Fig.10 for Figure 7 A partial enlarged view of point Ⅰ in the middle; Fig.11 for Figure 8 A partial enlarged view of point II in the middle.
[0017] In the figure: 1. Material crushing assembly; 2. Crushing plate; 3. Mounting hole; 4. Arc-shaped top plate; 5. Arc-shaped bottom plate; 6. Limiting groove; 7. L-shaped limiting rod; 8. Fixed plate; 9. Extension rod; 10. Rotating rod; 11. Plate lifting assembly; 12. Electric telescopic device; 13. Connecting rod; 14. Fixed rod; 15. Buffer damping rod; 16. Sliding block; 17. Fixed frame; 18. Control panel; 19. L-shaped fixed column; 20. Anti-wear pad; 21. L-shaped feed pipe; 22. Protective cover; 23. Driving motor; 24. Bearing seat; 25. Rotating shaft; 26. Working cylinder; 27. Extraction pump; 28. Feed pipe; 29. Fixed sleeve; 30. Cleaning plate; 31. Fixed block; 32. Filter hole. DETAILED DESCRIPTION
[0018] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0019] A spheroidizing agent crushing and grinding device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
[0020] like Figure 1 , Figure 7 , Fig. 9 , Fig.10 As shown, an embodiment of the present invention provides a spheroidizer crushing and grinding device, including: a material crushing component 1, including a crushing plate 2, an arc-shaped top plate 4, an arc-shaped bottom plate 5, a fixed plate 8 and an extension rod 9, the surface of the crushing plate 2 is provided with a mounting hole 3, the arc-shaped top plate 4 and the arc-shaped bottom plate 5 are arranged inside the mounting hole 3, the fixed plate 8 is arranged inside the arc-shaped bottom plate 5, and the extension rod 9 is arranged inside the arc-shaped top plate 4; the arc-shaped top plate 4 and the arc-shaped bottom plate 5 are both provided with a limiting groove 6 inside, the fixed plate 8 is arranged inside the limiting groove 6 of the arc-shaped bottom plate 5, the extension rod 9 is arranged inside the limiting groove 6 of the arc-shaped bottom plate 5, and a rotating rod 10 is penetrated inside the extension rod 9; a plurality of groups of filter holes 32 are provided on the bottom surface of the crushing plate 2, and a filter screen 33 is provided inside the crushing plate 2.
[0021] In a specific application of the embodiment of the present invention, the crushing plate 2 is driven by the plate lifting assembly 11 to perform a linear up and down motion. At this time, the rotating shaft 25 will also drive the crushing plate 2 to rotate inside the working cylinder 26 (the crushing plate 2 not only moves up and down, but also performs a rotating motion), and the spheroidizing agent inside the working cylinder 26 is crushed and ground, effectively increasing the contact frequency and contact mode between the crushing plate 2 and the spheroidizing agent, and improving the crushing efficiency; when the spheroidizing agent passes through the surface of the crushing plate 2, due to the extrusion between the spheroidizing agents and the rotation of the crushing plate 2, the spheroidizing agent will enter the interior of the crushing plate 2 through the arc-shaped bottom plate 5 (the arc-shaped top plate 4 is fixedly installed inside the mounting hole 3, and the extension rod 9 has its own retractable ductility, When the arc-shaped bottom plate 5 is subjected to force, the fixed plate 8 will transmit the force to the extension rod 9. The extension rod 9 extends and, under the action of the rotating rod 10, makes the arc-shaped bottom plate 5 move toward the inside of the crushing plate 2 relative to the arc-shaped top plate 4, so as to facilitate the spheroidizer to enter the inside of the crushing plate 2, which not only increases the crushing space, but also makes it easier for the spheroidizer to enter the inside of the crushing plate 2, thereby improving the crushing efficiency. After the spheroidizer enters the inside of the crushing plate 2, the spheroidizer with smaller particles is cleared out from the filter holes 32 at the bottom of the arc-shaped bottom plate 5 on the other side and the crushing plate 2 through the filter screen, and the spheroidizer with larger particles will continue to be crushed and ground inside the crushing plate 2 under the action of the axial force and the extrusion force until the desired particle size is reached.
[0022] In a possible implementation, Figure 2 , Figure 7 , Fig. 9 , Fig.10 As shown, the plate lifting assembly 11 includes a connecting rod 13, a fixed rod 14, a buffer damping rod 15 and a sliding block 16. One end of the connecting rod 13 is arranged on the outside of the crushing plate 2, the sliding block 16 is arranged at the other end of the connecting rod 13, the fixed rod 14 is passed through the inside of the connecting rod 13, and the buffer damping rod 15 is arranged on both sides of the sliding block 16; an electric telescopic device 12 is arranged inside the fixed frame 17, and the output end of the electric telescopic device 12 is arranged on the outer wall of the crushing plate 2, driving the crushing plate 2 to slide up and down on the surface of the rotating shaft 25.
[0023] In a specific application of the embodiment of the present invention, the control panel 18 starts the electric telescopic device 12, and the electric telescopic device 12 converts electrical energy into mechanical energy to drive the crushing plate 2 to move up and down in the vertical direction of the rotating shaft 25. The crushing plate 2 and the connecting rod 13 are fixedly connected. The vertical movement of the crushing plate 2 can directly drive the connecting rod 13 to move synchronously. Since a fixed rod 14 is inserted inside the connecting rod 13, the fixed rod 14 is inserted into the hole of the connecting rod 13 to form a sliding fit relationship. Therefore, the connecting rod 13 slides up and down on the surface of the fixed rod 14 to ensure the stability and guidance of the movement of the connecting rod 13 and avoid unnecessary lateral deviation, so that the connecting rod 13 drives the sliding block 16 to rise and fall inside the fixed frame 17; when the sliding block 16 rises or falls, the buffer damper generates resistance by compressing or stretching the internal spring and hydraulic oil (or air pressure), effectively controlling the movement speed of the sliding block 16, preventing overshoot caused by inertia, and improving the operating stability and service life of the entire crushing and grinding device.
[0024] In a possible implementation, Figure 5 , Figure 6 , Fig. 9 , Fig.10 As shown, a working cylinder 26 is provided inside the working cylinder 26, a driving motor 23 is provided inside the driving motor 23, a rotating shaft 25 is provided at the output end of the driving motor 23, bearing seats 24 are provided on both sides of the rotating shaft 25, a fixed frame 17 is provided on the side wall of the rotating shaft 25, and the plate lifting assembly 11 is provided inside the fixed frame 17.
[0025] In a specific application of the embodiment of the present invention, the control panel 18 starts the drive motor 23, and the drive motor 23 drives the rotating shaft 25 to rotate. Driven by the high-speed rotation of the rotating shaft 25, the material crushing component 1 can not only generate strong shearing force and impact force on the spheroidizer to achieve preliminary crushing, but also, due to its up and down movement characteristics, it can also make the crushed spheroidizer particles form a circulation flow in the working cylinder 26, further enhancing the crushing effect, ensuring that the spheroidizer in every corner can be evenly crushed, so that the final spheroidizer particles reach an ideal degree of refinement.
[0026] In a possible implementation, Figure 4 , Figure 5 , Figure 6 , Figure 8 , Fig.11 As shown, an L-shaped feed pipe 21 is provided on the outside of the working cylinder 26, and two groups of L-shaped feed pipes 21 are provided. The tops of the two groups of L-shaped feed pipes 21 are provided with protective covers 22; a suction pump 27 is provided at the bottom of the inner cavity of the working cylinder 26, and a delivery pipe 28 is provided at the output end of the suction pump 27, and the other end of the delivery pipe 28 is provided above the material crushing component 1; a fixed sleeve 29 is provided inside the delivery pipe 28, and a fixed block 31 is provided above the fixed sleeve 29, an L-shaped limiting rod 7 is provided on one side of the fixed block 31, and a cleaning plate 30 is provided inside the fixed sleeve 29, and the other end of the L-shaped limiting rod 7 is provided on the top surface of the cleaning plate 30.
[0027] In a specific application of the embodiment of the present invention, the spheroidizer is poured into the interior of the working cylinder 26 from the L-shaped feed pipe 21. Under the operation of the material crushing component 1 and the plate lifting component 11, the spheroidizer is initially crushed by high-speed rotation or other physical methods (such as impact, extrusion, etc.) to reduce its size to a certain extent; the initially treated spheroidizer falls to the bottom of the working cylinder 26, and the control panel 18 starts the pumping pump 27, which transports the initially treated spheroidizer to the top of the material crushing component 1 again through the feeding pipe 28, and the cycle is repeated until the crushing is completed. When the spheroidizer that meets the standards passes through the inside of the feed pipe 28, the spheroidizer will push the cleaning plate 30 to move upward under the power of the extraction pump 27, and the L-shaped limit rod 7 will provide a downward force on the cleaning plate 30, so as to provide a buffering effect on the cleaning plate 30. When the extraction pump 27 stops working, the cleaning plate 30 falls into the inside of the fixed sleeve 29 under the action of the L-shaped limit rod 7, which can effectively clean the residual materials that may adhere to the inner wall of the feed pipe 28 and keep the feed channel clean and unobstructed (multiple groups of this structure can be installed inside the feed pipe 28).
[0028] In a possible implementation, Figure 3 , Figure 5 As shown, L-shaped fixing columns 19 are further provided on the outside of the working cylinder 26 , and four groups of L-shaped fixing columns 19 are provided. The bottom surfaces of the four groups of L-shaped fixing columns 19 are all provided with anti-wear pads 20 , and the bottom surfaces of the anti-wear pads 20 are provided with anti-slip grooves.
[0029] In a specific application of the embodiment of the present invention, the friction between the entire device and the ground is further improved through the four groups of L-shaped fixing columns 19 on the bottom surface of the working cylinder 26 and the anti-slip grooves on the bottom surface of the anti-wear pad 20, thereby further stabilizing the stability of the device during operation.
[0030] In a possible implementation, a control panel 18 is further provided on the outer side of the working cylinder 26 , and the control panel 18 is electrically controlled and connected to the electric telescopic device 12 , the driving motor 23 and the material extraction pump 27 through conductive wires.
[0031] In the specific application of the embodiment of the present invention, the electric telescopic device 12, the drive motor 23 and the material pump 27 used in the device are all mature existing technologies. The working principles of the electric telescopic device 12, the drive motor 23 and the material pump 27 are also well known to people in this technical field and will not be described in detail here.
[0032] When the present invention is used, the spheroidizing agent is poured into the interior of the working cylinder 26 from the L-shaped feeding pipe 21, and the electric telescopic device 12 is started. The electric telescopic device 12 drives the crushing plate 2 to move up and down in the vertical direction of the rotating shaft 25. The vertical movement of the crushing plate 2 can directly drive the connecting rod 13 to move synchronously. The connecting rod 13 slides up and down on the surface of the fixed rod 14 to ensure the stability and guidance of the movement of the connecting rod 13 and avoid unnecessary lateral deviation, so that the connecting rod 13 drives the sliding block 16 to rise and fall inside the fixed frame 17.
[0033] Specifically, when the spheroidizer passes through the surface of the crushing plate 2, due to the extrusion between the spheroidizers and the rotation of the crushing plate 2, the spheroidizer will enter the interior of the crushing plate 2 through the arc-shaped bottom plate 5. After the spheroidizer enters the interior of the crushing plate 2, the spheroidizer with smaller particles will be cleared out from the arc-shaped bottom plate 5 on the other side and the filter holes 32 at the bottom of the crushing plate 2 through the filter screen, and the spheroidizer with larger particles will continue to be crushed and ground inside the crushing plate 2 under the action of axial force and extrusion force until the desired particle size is reached.
[0034] Specifically, the pumping pump 27 is started, and the pumping pump 27 transports the preliminarily treated spheroidizer through the conveying pipe 28 to the top of the material crushing component 1 again, and the cycle is repeated until the spheroidizer that meets the standards is crushed. When the preliminarily treated spheroidizer passes through the conveying pipe 28, the spheroidizer will push the cleaning plate 30 to move upward under the power of the pumping pump 27.
[0035] Specifically, when the extraction pump 27 stops working, the cleaning plate 30 falls into the interior of the fixing sleeve 29 under the action of the L-shaped limiting rod 7, which can effectively clean the residual materials that may adhere to the inner wall of the feeding pipe 28 and keep the feeding channel clean and unobstructed.
[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0037] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.
Claims
1. A spheroidizing agent crushing and grinding device, characterized in that: include: A material crushing assembly (1) comprises a crushing plate (2), an arc-shaped top plate (4), an arc-shaped bottom plate (5), a fixing plate (8) and an extension rod (9), wherein a mounting hole (3) is provided on the surface of the crushing plate (2), the arc-shaped top plate (4) and the arc-shaped bottom plate (5) are arranged inside the mounting hole (3) to guide the material into the crushing area, the fixing plate (8) is arranged inside the arc-shaped bottom plate (5) to prevent the material from splashing, and the extension rod (9) is arranged inside the arc-shaped top plate (4); The plate lifting assembly (11) comprises a connecting rod (13), a fixing rod (14), a buffering damping rod (15) and a sliding block (16), wherein one end of the connecting rod (13) is arranged on the outside of the crushing plate (2), the sliding block (16) is arranged on the other end of the connecting rod (13), the fixing rod (14) is inserted into the interior of the connecting rod (13), and the buffering damping rod (15) is arranged on both sides of the sliding block (16).
2. The spheroidizing agent crushing and grinding device according to claim 1, characterized in that: Also includes: A working cylinder (26) is provided with a driving motor (23) inside the working cylinder (26), a rotating shaft (25) is provided at the output end of the driving motor (23), bearing seats (24) are provided on both sides of the rotating shaft (25), a fixing frame (17) is provided on the side wall of the rotating shaft (25), and the plate lifting assembly (11) is arranged inside the fixing frame (17).
3. The spheroidizing agent crushing and grinding device according to claim 1, characterized in that: The arc-shaped top plate (4) and the arc-shaped bottom plate (5) are both provided with limiting grooves (6) inside, the fixing plate (8) is arranged inside the limiting groove (6) of the arc-shaped bottom plate (5), the extension rod (9) is arranged inside the limiting groove (6) of the arc-shaped bottom plate (5), and a rotating rod (10) is passed through the extension rod (9); a plurality of groups of filter holes (32) are provided on the bottom surface of the crushing plate (2), and a filter screen (33) is provided inside the crushing plate (2).
4. The spheroidizing agent crushing and grinding device according to claim 2, characterized in that: An electric retractor (12) is provided inside the fixed frame (17), and an output end of the electric retractor (12) is provided on the outer wall of the crushing plate (2), driving the crushing plate (2) to slide up and down on the surface of the rotating shaft (25).
5. The spheroidizing agent crushing and grinding device according to claim 2, characterized in that: An L-shaped feed pipe (21) is provided on the outside of the working cylinder (26), and two groups of the L-shaped feed pipes (21) are provided. The top ends of the two groups of the L-shaped feed pipes (21) are both provided with protective covers (22).
6. The spheroidizing agent crushing and grinding device according to claim 2, characterized in that: An L-shaped fixing column (19) is also provided on the outside of the working cylinder (26), and four groups of the L-shaped fixing columns (19) are provided. The bottom surfaces of the four groups of L-shaped fixing columns (19) are all provided with anti-wear pads (20), and the bottom surfaces of the anti-wear pads (20) are provided with anti-slip grooves.
7. The spheroidizing agent crushing and grinding device according to claim 2, characterized in that: A control panel (18) is also provided on the outside of the working cylinder (26), and the control panel (18) is electrically controlled and connected to the electric telescopic device (12), the driving motor (23), and the material extraction pump (27) respectively through conductive wires.
8. The spheroidizing agent crushing and grinding device according to claim 2, characterized in that: A material extraction pump (27) is provided at the bottom of the inner cavity of the working cylinder (26), a material delivery pipe (28) is provided at the output end of the material extraction pump (27), and the other end of the material delivery pipe (28) is provided above the material crushing assembly (1).
9. The spheroidizing agent crushing and grinding device according to claim 8, characterized in that: A fixing sleeve (29) is provided inside the feed pipe (28), a fixing block (31) is provided above the fixing sleeve (29), an L-shaped limiting rod (7) is provided on one side of the fixing block (31), a cleaning plate (30) is provided inside the fixing sleeve (29), and the other end of the L-shaped limiting rod (7) is provided on the top surface of the cleaning plate (30).