A carton dry honeycomb filter

Abstract

The application discloses a paper box type dry honeycomb filter and relates to the technical field of atmosphere control and pollution treatment, which comprises a filtering mechanism, the filtering mechanism comprises an outer box body, a large triangular supporting plate is movably connected between the interiors of two vertical first limiting holes, a small triangular supporting plate is movably connected between the interiors of two vertical second limiting holes, the surface of each large triangular supporting plate is provided with first honeycomb paper, and the surface of each small triangular supporting plate is provided with second honeycomb paper. The first honeycomb paper and the second honeycomb paper are matched to realize efficient multi-stage purification, the whole structure of the filtering mechanism adopts paper material, no adhesive is needed, the filtering mechanism can be completely recycled, is environment-friendly and energy-saving, is easy to assemble, and the air circulation efficiency is not affected.

Description

Technical Field

[0001] This invention relates to the field of atmospheric control and pollution treatment technology, specifically a paper-box type dry honeycomb filter. Background Technology

[0002] Existing air filtration devices mostly use filter cotton, HEPA filters, or electrostatic dust collection to purify the air, but these filters all have the following shortcomings: Among them, cotton filters are relatively inexpensive but are susceptible to moisture, have a short lifespan, and require frequent replacement; HEPA filters are stable and have strong anti-interference capabilities but are expensive, difficult to degrade, and not conducive to environmental recycling; electrostatic precipitators have extremely low wind resistance and low energy consumption but produce ozone, posing health risks; and some dry filters are reusable but have complex structures and high manufacturing costs, making them difficult to promote on a large scale.

[0003] In recent years, honeycomb paper has been widely used in the field of filter materials due to its lightweight, high strength, high specific surface area, and good air permeability. However, there is currently a lack of a dry filter that combines honeycomb paper with a simple cardboard box structure, has good airflow guidance capabilities, is easy to assemble and disassemble, and can be installed without adhesives.

[0004] Therefore, we propose a paper-box type dry honeycomb filter to solve the problems mentioned in the background art. Summary of the Invention

[0005] The purpose of this invention is to provide a paper-box type dry honeycomb filter to overcome the problems of traditional filter media relying on filter cotton, being non-degradable, and affecting air circulation efficiency and filtration performance.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a paper box type dry honeycomb filter, comprising a filtration mechanism, the filtration mechanism comprising an outer casing, the front surface and rear surface of the outer casing respectively having an air inlet and an air outlet, the interior of the outer casing being provided with an upper fixing plate and a lower fixing plate, which are symmetrically placed, the surfaces of the upper fixing plate and the lower fixing plate each having a plurality of first limiting holes and two second limiting holes, a large triangular support plate being movably engaged between the interiors of the two vertical first limiting holes, and a small triangular support plate being movably engaged between the interiors of the two vertical second limiting holes, the surface of each large triangular support plate being provided with a first honeycomb paper, and the surface of each small triangular support plate being provided with a second honeycomb paper.

[0007] Preferably, the outer casing is a cubic container formed by bending corrugated cardboard. The upper fixing plate and the lower fixing plate are respectively disposed on the top and bottom of the outer casing to fix the internal structure. Multiple large triangular support plates are arranged in a cross pattern in the inner cavity of the outer casing.

[0008] Preferably, the two small triangular support plates are respectively disposed in the gap between the air inlet and the air outlet to fill the space. Both the air inlet and the air outlet are elliptical through holes. Both the large triangular support plate and the small triangular support plate are made of rigid cardboard or composite fiberboard.

[0009] Preferably, both the first and second honeycomb paper are adhesive-free dry filter materials or recycled paper-based honeycomb materials, which are mainly fixed to the surface of the large triangular support plate and the surface of the small triangular support plate by mechanical winding, without the need for adhesives.

[0010] Preferably, the pore size of the first honeycomb paper is larger than that of the second honeycomb paper, and the two pore sizes work together to form a graded filter. The pore size of the first honeycomb paper is 3-5 mm, and the pore size of the second honeycomb paper is 0.8-1.5 mm. The large pore size of the first honeycomb paper is used for primary interception of larger particles, and the small pore size of the second honeycomb paper is used for fine capture of fine dust.

[0011] Preferably, the filter mechanism is provided with an auxiliary mechanism, which includes a connecting plate and mounting holes, located on the top of the outer casing. Both ends of the connecting plate are fixed with side plates, and the two side plates have different shapes. The two side plates are respectively placed on both sides of the outer casing, and the opposite side of the two side plates are in contact with the two sides of the outer casing. Each side plate has a pre-set card hole on its surface.

[0012] Preferably, multiple sealing rings are provided on opposite sides of the two side plates, and each sealing ring is located in a corresponding groove on the surface of the outer casing. The sealing rings are used to seal between the side plates and the outer casing. Multiple connecting frames are provided inside the outer casing, and multiple connecting rods are fixed between the multiple connecting frames.

[0013] Preferably, each of the connecting frames is located inside the air duct composed of multiple large triangular support plates and small triangular support plates. A connecting block is fixed at the connection between the connecting frame and the connecting rod. The surface of each connecting block is in contact with the inner surface of the outer casing. A fixing bolt is threaded into the threaded groove on the surface of each connecting block.

[0014] Preferably, the threaded end of each fixing bolt is movably fitted into the mounting hole in the inner wall of each groove corresponding to the outer casing surface, the threaded end of each fixing bolt is movably fitted into the inside of each sealing ring, and a set of limiting grooves is preset on the tail end surface of each fixing bolt. The side plate is movably engaged with the fixing bolt through the locking hole, the limiting groove and the sealing ring.

[0015] Preferably, the bottom of the outer casing is in contact with a gasket, and the surfaces of the two side plates are each pre-set with multiple fixing holes near the bottom. An I-shaped rod is movably engaged between the two fixing holes in the lateral direction, and the middle position of each I-shaped rod is respectively located at the groove at the bottom of the gasket.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, by setting up a filtration mechanism, larger particles and fine dust in the airflow can be intercepted by a graded filtration method. At the same time, all parts of the filtration mechanism are made of paper material, which does not require chemical adhesives, is degradable, easy to produce, environmentally friendly and recyclable, easy to assemble and disassemble, and does not affect the air circulation efficiency. In addition, the density, number of layers and size specifications of the first honeycomb paper and the second honeycomb paper can be adjusted according to different application scenarios.

[0017] 2. In this invention, by setting an auxiliary mechanism, the outer casing can be prevented from bulging outward when the air velocity or air volume inside the outer casing is high, thereby ensuring the stability of the airflow filtration performance. By using connecting rods, connecting frames, connecting blocks, fixing bolts, side plates and connecting plates in combination, the bulging of the four walls inside the outer casing due to high air velocity or air volume can be prevented.

[0018] 3. In this invention, the use of gaskets can prevent the I-shaped rod from vibrating and moving out of the fixing hole. The use of limiting grooves, locking holes, outer housing, I-shaped rod and fixing holes can prevent the side plate from moving. Attached Figure Description

[0019] Figure 1 This is a side perspective view of a paper box type dry honeycomb filter according to the present invention; Figure 2 This is a perspective view from below of a paper box type dry honeycomb filter according to the present invention. Figure 3 This is a schematic diagram of the internal three-dimensional structure of a paper box type dry honeycomb filter according to the present invention; Figure 4 This is a top-view cross-sectional view of a paper-box type dry honeycomb filter according to the present invention. Figure 5 This is a perspective view of the filtration mechanism of a paper box type dry honeycomb filter according to the present invention, taken from a bottom angle. Figure 6 This is a partial perspective view of the auxiliary mechanism of a paper box type dry honeycomb filter according to the present invention. Figure 7 This invention relates to a paper-box type dry honeycomb filter. Figure 2 Enlarged 3D view of the structure at point A in the middle; Figure 8This is a partial cross-sectional perspective view of a paper box type dry honeycomb filter according to the present invention. Figure 9 This is a three-dimensional structural diagram of the large triangular support plate and the small triangular support plate of a paper box type dry honeycomb filter according to the present invention. Figure 10 This is an exploded view of the auxiliary mechanism of a paper box type dry honeycomb filter according to the present invention.

[0020] In the diagram: 1. Filter mechanism; 11. Outer casing; 12. Air inlet; 13. Upper fixing plate; 14. First limiting hole; 15. Large triangular support plate; 16. Second limiting hole; 17. Small triangular support plate; 18. First honeycomb paper; 19. Second honeycomb paper; 110. Air outlet; 111. Lower fixing plate; 2. Auxiliary mechanism; 21. Connecting plate; 22. Side plate; 23. Clip hole; 24. Sealing ring; 25. Fixing bolt; 26. Connecting frame; 27. Connecting block; 28. Connecting rod; 29. ​​Limiting groove; 210. Mounting hole; 211. Gasket; 212. Fixing hole; 213. I-shaped rod. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1 to 10 The present invention provides a technical solution: A paper box type dry honeycomb filter includes a filter mechanism 1. The filter mechanism 1 includes an outer box 11. The front and rear surfaces of the outer box 11 are respectively provided with an air inlet 12 and an air outlet 110. The outer box 11 is provided with an upper fixing plate 13 and a lower fixing plate 111, which are placed symmetrically. The surfaces of the upper fixing plate 13 and the lower fixing plate 111 are each provided with a plurality of first limiting holes 14 and two second limiting holes 16. A large triangular support plate 15 is movably engaged between the interiors of the two vertical first limiting holes 14. A small triangular support plate 17 is movably engaged between the interiors of the two vertical second limiting holes 16. The surface of each large triangular support plate 15 is provided with a first honeycomb paper 18, and the surface of each small triangular support plate 17 is provided with a second honeycomb paper 19.

[0023] By adopting the above technical solution, when the airflow enters from the air inlet 12, the fine dust in the airflow is pre-treated by the second honeycomb paper 19 on the small triangular support plate 17 near the air inlet 12. Then, the airflow that has completed the preliminary treatment will pass through the air duct formed by all the large triangular support plates 15. Next, the larger particles in the airflow will be intercepted by the first honeycomb paper 18 when flowing inside the air duct. After that, the treated airflow will flow to the surface of the second honeycomb paper 19 on the small triangular support plate 17 near the air outlet 110. Then, the second honeycomb paper 19 will intercept the fine dust remaining in the airflow again. Finally, the treated airflow will be discharged from the air outlet 110. At the same time, the first honeycomb paper 18 and the second honeycomb paper 19 used in the filter mechanism 1 are both biodegradable, easy to produce, environmentally friendly and recyclable, easy to assemble and disassemble, and do not affect the air circulation efficiency.

[0024] Specifically, such as Figures 1-5 , Figure 8 and Figure 9 As shown, the outer box 11 is a cubic container formed by bending corrugated cardboard. The upper fixing plate 13 and the lower fixing plate 111 are respectively set on the top and bottom of the outer box 11 to fix the internal structure. Multiple large triangular support plates 15 are arranged in a cross pattern in the inner cavity of the outer box 11.

[0025] Two small triangular support plates 17 are respectively set in the gap between the air inlet 12 and the air outlet 110 to fill the space. Both the air inlet 12 and the air outlet 110 are elliptical through holes. The large triangular support plate 15 and the small triangular support plate 17 are both made of rigid cardboard or composite fiberboard.

[0026] The first honeycomb paper 18 and the second honeycomb paper 19 are both glue-free dry filter materials or recycled paper-based honeycomb materials. They are mainly fixed to the surface of the large triangular support plate 15 and the surface of the small triangular support plate 17 by mechanical winding, without the need for adhesives.

[0027] The pore size of the first honeycomb paper 18 is larger than that of the second honeycomb paper 19. The two pore sizes work together to form a graded filter. The pore size of the first honeycomb paper 18 is 3-5 mm, and the pore size of the second honeycomb paper 19 is 0.8-1.5 mm. The large pore size of the first honeycomb paper 18 is used for primary interception of larger particles, while the small pore size of the second honeycomb paper 19 is used for fine capture of fine dust.

[0028] By adopting the above technical solution, when the paper box type dry honeycomb filter needs to be assembled, the top of the outer box 11 is first opened, and then the lower fixing plate 111, each large triangular support plate 15 wrapped with the first honeycomb paper 18, each small triangular support plate 17 wrapped with the second honeycomb paper 19 and the upper fixing plate 13 are sequentially placed into the outer box 11. Then the top of the outer box 11 is closed and sealed with tape to complete the overall encapsulation.

[0029] Specifically, such as Figures 1-4 , Figure 6 , Figure 7 and Figure 10 As shown, the filter mechanism 1 is provided with an auxiliary mechanism 2. The auxiliary mechanism 2 includes a connecting plate 21 and a mounting hole 210, located on the top of the outer casing 11. Both ends of the connecting plate 21 are fixed with side plates 22, and the two side plates 22 have different shapes. The two side plates 22 are respectively placed on both sides of the outer casing 11, and the opposite side of the two side plates 22 is in contact with both sides of the outer casing 11. Each side plate 22 has a pre-set card hole 23 on its surface.

[0030] Multiple sealing rings 24 are provided on opposite sides of the two side plates 22, and each sealing ring 24 is located in a corresponding groove on the surface of the outer housing 11. The sealing rings 24 are used to seal between the side plates 22 and the outer housing 11. Multiple connecting brackets 26 are provided inside the outer housing 11, and multiple connecting rods 28 are fixed between the multiple connecting brackets 26.

[0031] Each connecting frame 26 is located inside the air duct composed of multiple large triangular support plates 15 and small triangular support plates 17. A connecting block 27 is fixed at the connection point between the connecting frame 26 and the connecting rod 28. The surface of each connecting block 27 is in contact with the inner surface of the outer casing 11. A fixing bolt 25 is threadedly connected to the threaded groove on the surface of each connecting block 27.

[0032] The threaded end of each fixing bolt 25 is movably fitted into the mounting hole 210 pre-set in the inner wall of each groove on the surface of the outer housing 11. The threaded end of each fixing bolt 25 is movably fitted into the inside of each sealing ring 24. A set of limiting grooves 29 are pre-set on the tail end surface of each fixing bolt 25. The side plate 22 is movably engaged with the fixing bolt 25 through the locking hole 23, the limiting groove 29 and the sealing ring 24.

[0033] The bottom of the outer casing 11 is in contact with a gasket 211. The surfaces of the two side plates 22 are each pre-set with multiple fixing holes 212 near the bottom. I-shaped rods 213 are movably engaged between the two horizontal fixing holes 212. The middle position of each I-shaped rod 213 is located at the corresponding groove at the bottom of the gasket 211.

[0034] By adopting the above technical solution, when the auxiliary mechanism 2 needs to be installed on the outer housing 11, after the large triangular support plate 15 and the small triangular support plate 17 are installed on the lower fixed plate 111, and before the upper fixed plate 13 is placed inside the outer housing 11, the frame composed of multiple connecting brackets 26, multiple connecting rods 28, and multiple connecting blocks 27 is directly placed inside the outer housing 11 (e.g., Figure 4(As shown), then a sealing ring 24 is fitted onto the threaded end of each fixing bolt 25. Next, the threaded end of the fixing bolt 25 is passed through the mounting hole 210 until it is threaded onto the corresponding connecting block 27. When all the fixing bolts 25 are installed, each sealing ring 24 is positioned in the corresponding groove on the surface of the outer casing 11. Then, each locking hole 23 on the side plate 22 is aligned with the corresponding fixing bolt 25 until the side plate 22 is fully engaged with the fixing bolt 25. Next, I-shaped rods 213 are placed between the two transverse fixing holes 212. After placing the I-shaped rods 213, the connection is then... A gasket 211 is placed between the I-shaped rod 213 and the bottom of the outer casing 11 to complete the installation of the auxiliary mechanism 2 on the filter mechanism 1. When the air velocity or air volume flowing inside the outer casing 11 is high, the pressure difference between the inside and outside of the outer casing 11 will increase. At this time, the positive pressure inside the outer casing 11 will evenly squeeze the four side walls of the corrugated paper outer casing 11 outward. When the outer casing 11 bulges outward, the side plate 22, connecting plate 21, fixing bolt 25, connecting rod 28, connecting frame 26, connecting block 27, I-shaped rod 213 and gasket 211 can prevent the outer casing 11 from bulging outward, thus ensuring normal airflow filtration performance.

[0035] Detailed implementation method: During assembly, first open the top of the outer casing 11, then place the lower fixing plate 111 inside the bottom of the outer casing 11 until the two limiting ends of the bottom of the lower fixing plate 111 are embedded in the grooves reserved at the bottom of the outer casing 11. Then, wrap the first honeycomb paper 18 around each large triangular support plate 15, and wrap the second honeycomb paper 19 around each small triangular support plate 17. Next, insert each large triangular support plate 15 wrapped with the first honeycomb paper 18 into the corresponding position on the lower fixing plate 111 placed inside the outer casing 11. Inside the first limiting hole 14, each small triangular support plate 17 wrapped with the second honeycomb paper 19 is inserted into the corresponding second limiting hole 16 on the lower fixing plate 111 placed inside the outer box 11. Then, the upper fixing plate 13 is moved into the outer box 11 until the top of each large triangular support plate 15 and the top of each small triangular support plate 17 are respectively aligned with the corresponding first limiting hole 14 and the corresponding second limiting hole 16 on the upper fixing plate 13. Finally, the top of the outer box 11 is closed and sealed with tape to complete the overall encapsulation. When the auxiliary mechanism 2 needs to be installed on the outer housing 11, after the large triangular support plate 15 and the small triangular support plate 17 are installed on the lower fixing plate 111, and before the upper fixing plate 13 is placed inside the outer housing 11, the frame composed of multiple connecting brackets 26, multiple connecting rods 28, and multiple connecting blocks 27 is directly placed inside the outer housing 11 (e.g., Figure 4(As shown), then a sealing ring 24 is fitted onto the threaded end of each fixing bolt 25. Next, the threaded end of the fixing bolt 25 is passed through the mounting hole 210 until it is threaded onto the corresponding connecting block 27. When all the fixing bolts 25 are installed, each sealing ring 24 is positioned in the corresponding groove on the surface of the outer casing 11. Then, the connecting plate 21 is used to move the two side plates 22 to directly above the outer casing 11. Next, the two side plates 22 are moved in opposite directions, undergoing a slight bending deformation. After shaping, move the connecting plate 21 down until each of the clip holes 23 on the side plate 22 is engaged with the corresponding fixing bolt 25. Then, let the side plate 22 return to its original shape using its elastic force. Then, continue to press down the connecting plate 21 until the side plate 22 is engaged with the fixing bolt 25. Finally, place the I-shaped rod 213 between the two horizontal fixing holes 212. After placing the I-shaped rod 213, place the gasket 211 between the I-shaped rod 213 and the bottom of the outer box 11. This completes the installation of the auxiliary mechanism 2 on the filter mechanism 1. When airflow enters through inlet 12, the fine dust particles in the airflow are pre-treated by the second honeycomb paper 19 on the small triangular support plate 17 near inlet 12. The pre-treated airflow then passes through the air duct formed by all the large triangular support plates 15. Larger particles in the airflow are then intercepted by the first honeycomb paper 18 as they flow within the air duct. The treated airflow then flows to the surface of the second honeycomb paper 19 on the small triangular support plate 17 near outlet 110, where the second honeycomb paper 19 again intercepts any remaining fine dust particles. Finally, the treated airflow is discharged from outlet 110. When the air velocity or air volume flowing inside the outer casing 11 is high, the pressure difference between the inside and outside of the outer casing 11 will increase. At this time, the positive pressure inside the outer casing 11 will evenly squeeze the four side walls of the corrugated paper outer casing 11 outward. When the outer casing 11 bulges outward, the outer casing 11 can be prevented from bulging outward by the cooperation of the side plate 22, connecting plate 21, fixing bolt 25, connecting rod 28, connecting frame 26, connecting block 27, I-shaped rod 213 and gasket 211. At this time, the airflow filtration performance can be guaranteed to be normal. At the same time, the honeycomb paper used is degradable, easy to produce, environmentally friendly and recyclable, easy to assemble and disassemble, and does not affect the air circulation efficiency.

[0036] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A paper-box type dry honeycomb filter, characterized in that: The filter mechanism (1) includes an outer casing (11). The front and rear surfaces of the outer casing (11) are respectively provided with an air inlet (12) and an air outlet (110). The outer casing (11) is provided with an upper fixing plate (13) and a lower fixing plate (111) inside, and the two are placed symmetrically. The surfaces of the upper fixing plate (13) and the lower fixing plate (111) are provided with a plurality of first limiting holes (14) and two second limiting holes (16). A large triangular support plate (15) is movably engaged between the interiors of the two vertical first limiting holes (14), and a small triangular support plate (17) is movably engaged between the interiors of the two vertical second limiting holes (16). The surface of each large triangular support plate (15) is provided with a first honeycomb paper. 18), each of the small triangular support plates (17) is provided with a second honeycomb paper (19) on its surface. The outer box (11) is a cubic container formed by bending corrugated cardboard. The upper fixing plate (13) and the lower fixing plate (111) are respectively set at the top and bottom of the outer box (11) to fix the internal structure. Multiple large triangular support plates (15) are arranged in a cross pattern in the inner cavity of the outer box (11). Two small triangular support plates (17) are respectively set in the gap between the air inlet (12) and the air outlet (110) to fill the space. The air inlet (12) and the air outlet (110) are both elliptical through holes. The large triangular support plates (15) and the small triangular support plates (17) are both made of hard cardboard or composite fiberboard. The filter mechanism (1) is provided with an auxiliary mechanism (2), which includes a connecting plate (21) and a mounting hole (210). The connecting plate (21) is located on the top of the outer casing (11). Both ends of the connecting plate (21) are fixed with side plates (22), and the two side plates (22) have different shapes. The two side plates (22) are respectively placed on both sides of the outer casing (11). The opposite side of the two side plates (22) is in contact with the opposite side of the outer casing (11). Each side plate (22) has a pre-set card hole (23) on its surface. Multiple sealing rings (24) are provided on the opposite side of the two side plates (22), and each sealing ring (24) is located in the corresponding groove on the surface of the outer casing (11). The sealing rings (24) are used to seal between the side plates (22) and the outer casing (11). Multiple connecting rings are provided inside the outer casing (11). The frame (26) has multiple connecting rods (28) fixed between multiple connecting frames (26). Each connecting frame (26) is located inside the air duct composed of multiple large triangular support plates (15) and small triangular support plates (17). A connecting block (27) is fixed at the connection between the connecting frame (26) and the connecting rod (28). The surface of each connecting block (27) is in contact with the inner surface of the outer casing (11). A fixing bolt (25) is threaded into the threaded groove on the surface of each connecting block (27). A gasket (211) is in contact with the bottom of the outer casing (11). Multiple fixing holes (212) are preset on the surface of the two side plates (22) near the bottom. An I-shaped rod (213) is movably engaged between the two fixing holes (212) in the transverse direction. The middle position of each I-shaped rod (213) is located at the groove corresponding to the bottom of the gasket (211).

2. The paper-box type dry honeycomb filter according to claim 1, characterized in that: The first honeycomb paper (18) and the second honeycomb paper (19) are both glue-free dry filter materials or recycled paper-based honeycomb materials. They are mainly fixed to the surface of the large triangular support plate (15) and the surface of the small triangular support plate (17) by mechanical winding, without the need for adhesives.

3. The paper-box type dry honeycomb filter according to claim 1, characterized in that: The pore size of the first honeycomb paper (18) is larger than that of the second honeycomb paper (19). The two pore sizes work together to form a graded filter. The pore size of the first honeycomb paper (18) is 3-5 mm, and the pore size of the second honeycomb paper (19) is 0.8-1.5 mm. The large pore size of the first honeycomb paper (18) is used for primary interception of larger particles, and the small pore size of the second honeycomb paper (19) is used for fine capture of fine dust.

4. The paper-box type dry honeycomb filter according to claim 1, characterized in that: The threaded end of each fixing bolt (25) is movably sleeved inside the mounting hole (210) pre-set in the inner wall of each groove corresponding to the surface of the outer casing (11). The threaded end of each fixing bolt (25) is movably sleeved inside each sealing ring (24). A set of limiting grooves (29) is pre-set on the tail end surface of each fixing bolt (25). The side plate (22) is movably clamped onto the fixing bolt (25) through the locking hole (23), the limiting groove (29) and the sealing ring (24).

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