Biodegradable film quality-guaranteeing storage device

Abstract

The utility model relates to the technical field of storage devices, in particular to a biodegradable film quality-guaranteeing storage device which comprises a storage barrel, a sealing mechanism is connected to the outer side of the storage barrel in a sleeved mode, an installation mechanism is arranged in the middle of the interior of the storage barrel, and a dust removal and moisture preservation mechanism is arranged at the bottom end of the interior of the storage barrel. The biodegradable film storage device has the beneficial effects that a biodegradable film can be conveniently taken and placed through a clamping groove, a taking and placing groove and a biodegradable film winding roller, the interior of the storage barrel is kept sealed through a first sealing ring, a second sealing ring and a third sealing ring in the sealing barrel, and quality-guaranteed storage of the biodegradable film is facilitated; and the blown-out air is filtered and dedusted through the filter cloth and the filter cotton, the blown-out air is humidified, the humid air is kept to be blown to the surface of the mounting mechanism, the biodegradation film is moisturized, and dust-free and moisturizing quality-guaranteeing storage of the biodegradation film is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of storage devices, in particular to a quality-preserving storage device for biodegradable films. Background Art

[0002] A degradation film is a new type of degradable film. Its degradation principle is that biodegradable biomass is incorporated into the plastic component, making it easy for large pieces of plastic to degrade into small pieces of plastic.

[0003] The quality-preserving storage of biodegradable films is a storage device for storing biodegradable films, aiming to better preserve biodegradable films and prevent them from being damaged, and it has been widely used in the field; the quality-preserving storage device for biodegradable films includes the storage and retrieval of biodegradable films, making it convenient for storage and portable retrieval.

[0004] For example, the prior art Chinese patent publication number "CN112110248A" provides a dust-free storage device for biodegradable films, including a housing and a biodegradable film body. One side of the housing is fixedly connected with an extension plate, and a rotating roller is movably connected to one side of the extension plate. The outer surface of the rotating roller is wound around the biodegradable film body. The bottom of the housing is fixedly connected with a water tank, and a water pump is arranged in the water tank. The water outlet end of the water pump is fixedly connected with two connecting pipes. A plurality of spray heads are fixedly connected to one side of the housing, and the spray heads are located between the extension plates. The spray heads are fixedly connected to one end of the connecting pipes. A slideway is arranged on one side of the housing. This

[0005] This device abandons the storage method of traditional biodegradable film storage devices, has a certain degree of creativity, removes static electricity and cleans the degradation film before sending the biodegradable film to dust-free storage, can effectively prevent dust from being brought into the storage device, and improves the storage quality of biodegradable films to a certain extent and the storage efficiency of degradation films.

[0006] In the existing quality-preserving storage device for biodegradable films, during the storage process, the biodegradable films inside are placed still, and after long-term placement, they will become dry and stick together. There is no ventilation and moisturization for the biodegradable films, which is not conducive to the long-term quality-preserving storage of biodegradable films. Utility Model Content

[0007] The purpose of the present utility model is to solve the defect that in the prior art, the biodegradable films are placed still, and after long-term placement, they will become dry and stick together, and there is no ventilation and moisturization for the biodegradable films, and to propose a quality-preserving storage device for biodegradable films.

[0008] To achieve the above purpose, the present utility model provides the following technical solutions:

[0009] Design a biodegradable film quality-preserving storage device, including a storage cylinder. A sealing mechanism is sleeved outside the storage cylinder. An installation mechanism is arranged in the middle of the interior of the storage cylinder. A dust removal and humidity preservation mechanism is arranged at the bottom end of the interior of the storage cylinder. The sealing mechanism includes a sealing cylinder. A first sealing ring is bonded to the bottom end of the interior of the sealing cylinder. A second sealing ring is bonded to the top end inner wall of the sealing cylinder. A third sealing ring is bonded to the top end interior of the sealing cylinder. A pick-and-place groove is formed on the surface of the storage cylinder. The sealing cylinder is hermetically sleeved on the outer surface of the storage cylinder. The installation mechanism includes a rotating rod, an installation column and an installation frame. The rotating rod is rotatably inserted into the middle of the interior of the storage cylinder, and a motor is installed at its top end. The installation column is fixed on the surface of the rotating rod. The installation frames are evenly and fixedly distributed on the surface of the installation column. A reinforcing rib is fixed between the bottom end of the installation frame and the surface of the installation column. Clamping grooves are formed at both ends of the installation frame. A biodegradable film winding roller is installed inside the installation frame. The dust removal and humidity preservation mechanism is arranged below the installation mechanism and includes a filter cotton and a filter cloth, which are used to blow out the wet air after filtering and dust removal to the upper installation mechanism to keep the biodegradable film dust-free and at a good humidity during storage.

[0010] Furthermore, the dust removal and humidity preservation mechanism further includes a blowing box and a blower. A bottom plate is fixed to the bottom end of the storage cylinder. The blower is installed at the top end of the bottom plate, and an air duct is connected between its side and the bottom end of the blowing box. A support column is fixed to the bottom end of the blowing box. Blowing holes are formed at the top end of the blowing box. The filter cloth covers the top end of the blowing box. The filter cotton is laid on the top of the filter cloth. A water retaining ring is fixed at the top edge of the blowing box and surrounds the filter cotton at a gap.

[0011] Furthermore, ventilation pipes are vertically arranged on both sides of the top end of the storage cylinder. A dust-proof cotton column is plugged at the top end interior of the ventilation pipe. The middle of the top end of the sealing cylinder is hollow and surrounds the outside of the ventilation pipe. The storage cylinder is of a cylindrical structure and is vertically arranged. The pick-and-place groove is of a rectangular groove structure and is vertically arranged and evenly distributed outside the biodegradable film winding roller. Its height is greater than the height of the installation column and less than the height of the storage cylinder.

[0012] Furthermore, the sealing cylinder is of a cylindrical structure and is vertically arranged. The first sealing ring, the second sealing ring and the third sealing ring are all of an annular structure surface, are all horizontally arranged, are all made of sealing rubber material, and all abut against the outer surface of the storage cylinder.

[0013] Furthermore, the first sealing ring is located at the bottom end of the pick-and-place groove. The second sealing ring is located at the top end of the pick-and-place groove. The third sealing ring abuts against the top end of the storage cylinder.

[0014] Further, the rotating rod is vertically arranged, the motor is installed in the middle of the top end of the storage cylinder, the mounting column is of a cylindrical structure and is vertically arranged, the mounting frame is of a C-shaped frame structure and is horizontally arranged, and the biodegradable film winding roller is horizontally arranged, and both ends thereof are slidably clamped inside the clamping groove.

[0015] Further, the bottom plate is of a circular plate structure and is horizontally arranged, the blower is located outside the storage cylinder, the air duct passes through the bottom end of the side surface of the storage cylinder, the air blowing box is of a circular box structure and is horizontally arranged at the bottom end inside the storage cylinder, and the rotating rod rotates through the middle of the air blowing box.

[0016] Further, the air blowing holes are uniformly distributed at the top end of the air blowing box, the filter cloth covers the air blowing holes, the rotating rod rotates through the filter cloth and the filter cotton, both the filter cloth and the filter cotton are of circular structures, and the water retaining ring is of an annular structure, and the top end thereof is not higher than the top end of the filter cotton.

[0017] A biodegradable film quality preservation storage device proposed by the present utility model has the beneficial effects that:

[0018] 1. In the storage cylinder of the present utility model, the mounting column and the mounting frame are rotatably arranged inside, and through the clamping groove, the taking and placing groove and the biodegradable film winding roller, the biodegradable film can be taken and placed conveniently. Moreover, outside the storage cylinder, the sealing cylinder is tightly sleeved in a sealed manner, and the sealing inside the storage cylinder is maintained through the first sealing ring, the second sealing ring and the third sealing ring inside the sealing cylinder, which is beneficial to the quality preservation storage of the biodegradable film.

[0019] 2. The dust removal and humidity preservation mechanism is arranged at the bottom end inside the storage cylinder of the present utility model. In the dust removal and humidity preservation mechanism, water is pre-soaked in the filter cloth and the filter cotton at the top end of the air blowing box, the blower blows air into the air blowing box through the air duct and blows it upward from the air blowing holes, and the blown air is filtered and dust-removed and humidified through the filter cloth and the filter cotton, and the humid air is blown to the surface of the mounting mechanism to keep the biodegradable film humid, which is beneficial to the dust-free and humid quality preservation storage of the biodegradable film. Description of the Drawings

[0020] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0021] Figure 2 is of the present utility model Figure 1 sectional view;

[0022] Figure 3 is of the present utility model Figure 2 enlarged view at A;

[0023] Figure 4 is of the present utility modelFigure 2 Enlarged view of part B;

[0024] Figure 5 This is the Figure 1 Schematic diagram of the storage cylinder part of the present utility model;

[0025] Figure 6 This is the Figure 1 Schematic diagram of the sealing cylinder part of the present utility model;

[0026] Figure 7 This is the Figure 1 Schematic diagram of the installation mechanism and dust removal and moisture preservation mechanism parts of the present utility model;

[0027] Figure 8 This is the Figure 1 Schematic diagram of the blowing box and blowing holes part of the present utility model;

[0028] Figure 9 This is the Figure 1 Schematic diagram of the installation mechanism part of the present utility model;

[0029] Figure 10 This is the Figure 1 Schematic diagram of the installation column and installation frame parts of the present utility model.

[0030] In the figure: 1. Storage cylinder; 2. Bottom plate; 3. Sealing cylinder; 4. Ventilation pipe; 5. Dust-proof cotton column; 6. Motor; 7. Support column; 8. Blowing box; 9. Clamping groove; 10. Filter cotton; 11. Biodegradable film winding roller; 12. Installation column; 13. Access slot; 14. Blower; 15. First sealing ring; 16. Blowing air pipe; 17. Blowing hole; 18. Filter cloth; 19. Water retaining ring; 20. Installation frame; 21. Second sealing ring; 22. Third sealing ring; 23. Rotating rod; 24. Reinforcing rib. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0032] Embodiment 1

[0033] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 Figure 8 Figure 9 and Figure 10, A biodegradable film quality preservation storage device in the illustration, including a storage cylinder 1, a sealing mechanism is sleeved outside the storage cylinder 1, an installation mechanism is arranged in the middle of the inside of the storage cylinder 1, and a dust removal and humidity preservation mechanism is arranged at the bottom end of the inside of the storage cylinder 1.

[0034] The sealing mechanism includes a sealing cylinder 3. A first sealing ring 15 is bonded to the bottom end inside the sealing cylinder 3, a second sealing ring 21 is bonded to the top end inner wall of the sealing cylinder 3, a third sealing ring 22 is bonded to the top end inside the sealing cylinder 3. A pick-and-place groove 13 is formed on the surface of the storage cylinder 1, and the sealing cylinder 3 is hermetically sleeved on the outer surface of the storage cylinder 1.

[0035] The installation mechanism includes a rotating rod 23, an installation column 12 and an installation frame 20. The rotating rod 23 is rotatably inserted into the middle of the inside of the storage cylinder 1, and a motor 6 is installed at its top end. The installation column 12 is fixed on the surface of the rotating rod 23. The installation frames 20 are evenly and fixedly distributed on the surface of the installation column 12. A reinforcing rib 24 is fixed between the bottom end of the installation frame 20 and the surface of the installation column 12. Clamping grooves 9 are formed at both ends of the installation frame 20, and a biodegradable film winding roller 11 is installed inside the installation frame 20.

[0036] The dust removal and humidity preservation mechanism is arranged below the installation mechanism and includes a filter cotton 10 and a filter cloth 18, which are used to blow out the wet air after filtering and dust removal to the installation mechanism above to keep the biodegradable film dust-free storage and good humidity.

[0037] The installation column 12 and the installation frame 20 are rotatably arranged inside the storage cylinder 1. Through the clamping groove 9, the pick-and-place groove 13 and the biodegradable film winding roller 11, the biodegradable film can be conveniently taken and placed. Moreover, outside the storage cylinder 1, the sealing cylinder 3 is tightly sleeved. The first sealing ring 15, the second sealing ring 21 and the third sealing ring 22 inside the sealing cylinder 3 keep the inside of the storage cylinder 1 sealed, which is beneficial to the quality preservation storage of the biodegradable film.

[0038] Ventilation pipes 4 are vertically arranged on both sides of the top end of the storage cylinder 1. A dust-proof cotton column 5 is plugged at the top end inside the ventilation pipes 4. The middle of the top end of the sealing cylinder 3 is hollow and surrounds the outside of the ventilation pipes 4. The storage cylinder 1 is of a cylindrical structure and is vertically arranged. The pick-and-place groove 13 is of a rectangular groove structure and is vertically arranged and evenly distributed outside the biodegradable film winding roller 11. Its height is greater than the height of the installation column 12 and less than the height of the storage cylinder 1.

[0039] The sealing cylinder 3 is of a cylindrical structure and is vertically arranged. The first sealing ring 15, the second sealing ring 21 and the third sealing ring 22 are all of an annular structural surface, are all horizontally arranged, are all made of sealing rubber material, and all abut against the outer surface of the storage cylinder 1. The first sealing ring 15 is located at the bottom end of the access slot 13, the second sealing ring 21 is located at the top end of the access slot 13, and the third sealing ring 22 abuts against the top end of the storage cylinder 1.

[0040] The rotating rod 23 is vertically arranged. The motor 6 is installed in the middle of the top end of the storage cylinder 1. The mounting column 12 is of a cylindrical structure and is vertically arranged. The mounting frame 20 is of a C-shaped frame structure and is horizontally arranged. The biodegradable film winding roller 11 is horizontally arranged, and its two ends are slidably clamped inside the clamping groove 9.

[0041] Embodiment 2

[0042] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 Figure 8 Figure 9 and Figure 10 As shown in the figures, a biodegradable film quality preservation storage device includes a storage cylinder 1. A sealing mechanism is sleeved outside the storage cylinder 1. An installation mechanism is arranged in the middle of the inside of the storage cylinder 1. A dust removal and humidity preservation mechanism is arranged at the bottom end of the inside of the storage cylinder 1. The sealing mechanism includes a sealing cylinder 3. A first sealing ring 15 is bonded to the bottom end inside the sealing cylinder 3. A second sealing ring 21 is bonded to the top inner wall of the sealing cylinder 3. A third sealing ring 22 is bonded to the top end inside the sealing cylinder 3. An access slot 13 is formed on the surface of the storage cylinder 1. The sealing cylinder 3 is sealingly sleeved on the outer surface of the storage cylinder 1. The installation mechanism includes a rotating rod 23, a mounting column 12 and a mounting frame 20. The rotating rod 23 is rotatably inserted into the middle of the inside of the storage cylinder 1, and a motor 6 is installed at its top end. The mounting column 12 is fixed on the surface of the rotating rod 23. The mounting frames 20 are uniformly and fixedly distributed on the surface of the mounting column 12. A reinforcing rib 24 is fixed between the bottom end of the mounting frame 20 and the surface of the mounting column 12. Clamping grooves 9 are formed at both ends of the mounting frame 20. A biodegradable film winding roller 11 is installed inside the mounting frame 20. The dust removal and humidity preservation mechanism is arranged below the installation mechanism and includes a filter cotton 10 and a filter cloth 18, which are used to blow out humid air after filtering and dust removal for the upper installation mechanism above to keep the biodegradable film dust-free and in good humidity during storage.

[0043] Inside the storage cylinder 1, the mounting post 12 and the mounting frame 20 are rotatably arranged. Through the clamping groove 9, the access slot 13 and the biodegradable film winding roller 11, the biodegradable film can be conveniently taken and placed. Moreover, on the outside of the storage cylinder 1, the sealing cylinder 3 is tightly sleeved. The inside of the storage cylinder 1 is sealed by the first sealing ring 15, the second sealing ring 21 and the third sealing ring 22 inside the sealing cylinder 3, which is beneficial to the quality storage of the biodegradable film.

[0044] The dust removal and moisture preservation mechanism further includes a blowing box 8 and a blower 14. The bottom end of the storage cylinder 1 is fixed with a bottom plate 2. The blower 14 is installed on the top end of the bottom plate 2. A blower pipe 16 is communicated between the side surface of the blower 14 and the bottom end of the blowing box 8. The bottom end of the blowing box 8 is fixed with a support column 7. The top end of the blowing box 8 is provided with blowing holes 17. The filter cloth 18 covers the top end of the blowing box 8. The filter cotton 10 is laid on the top end of the filter cloth 18. A water retaining ring 19 is fixed at the edge of the top end of the blowing box 8 and surrounds the outside of the filter cotton 10 with a gap.

[0045] A dust removal and moisture preservation mechanism is arranged at the bottom end inside the storage cylinder 1. In the dust removal and moisture preservation mechanism, the filter cloth 18 and the filter cotton 10 at the top end of the blowing box 8 are pre-soaked with water. The blower 14 blows air into the blowing box 8 through the blower pipe 16 and blows it upward through the blowing holes 17. The air blown out is filtered and dust-removed by the filter cloth 18 and the filter cotton 10, and the air blown out is humidified to keep the wet air blown onto the surface of the mounting mechanism to moisturize the biodegradable film, which is beneficial to the quality storage of the biodegradable film with dust-free and moisture preservation.

[0046] The bottom plate 2 is a circular plate structure and is horizontally arranged. The blower 14 is located outside the storage cylinder 1. The blower pipe 16 passes through the bottom end side surface of the storage cylinder 1. The blowing box 8 is a circular box structure and is horizontally arranged at the bottom end inside the storage cylinder 1. The rotating rod 23 rotates through the middle of the blowing box 8.

[0047] The blowing holes 17 are evenly distributed at the top end of the blowing box 8. The filter cloth 18 covers the blowing holes 17. The rotating rod 23 rotates through the filter cloth 18 and the filter cotton 10. Both the filter cloth 18 and the filter cotton 10 are circular structures. The water retaining ring 19 is a circular ring structure, and its top end is not higher than the top end of the filter cotton 10.

[0048] Working mode; an installation column 12 and an installation frame 20 are rotatably arranged inside a storage cylinder 1. Through a clamping groove 9, a picking and placing groove 13 and a biodegradable film winding roller 11, the biodegradable film can be conveniently picked and placed. Moreover, on the outer side of the storage cylinder 1, a sealing cylinder 3 is tightly sleeved. The inside of the storage cylinder 1 is kept sealed through a first sealing ring 15, a second sealing ring 21 and a third sealing ring 22 inside the sealing cylinder 3, which is beneficial to the quality preservation storage of the biodegradable film.

[0049] A dust removal and humidity preservation mechanism is arranged at the inner bottom end of the storage cylinder 1. In the dust removal and humidity preservation mechanism, water is pre-soaked in a filter cloth 18 and a filter cotton 10 at the top of a blowing box 8. A blower 14 blows air into the inside of the blowing box 8 through a blowing air pipe 16 and blows it upward from a blowing hole 17. The blown air is filtered and dust-removed through the filter cloth 18 and the filter cotton 10, and the blown air is humidified to keep the wet air blown to the surface of the installation mechanism to humidify the biodegradable film, which is beneficial to the quality preservation storage of the biodegradable film with dust-free and humidity preservation.

[0050] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A biodegradable film quality preservation storage device, comprising a storage cylinder (1), characterized in that: A sealing mechanism is sleeved outside the storage cylinder (1), an installation mechanism is arranged in the middle of the storage cylinder (1), and a dust removal and humidity preservation mechanism is arranged at the bottom end of the storage cylinder (1); The sealing mechanism includes a sealing cylinder (3). A first sealing ring (15) is bonded to the bottom end inside the sealing cylinder (3), a second sealing ring (21) is bonded to the top end inner wall of the sealing cylinder (3), a third sealing ring (22) is bonded to the top end inside the sealing cylinder (3). A pick-up and placement groove (13) is formed on the surface of the storage cylinder (1), and the sealing cylinder (3) is hermetically sleeved on the outer surface of the storage cylinder (1); The installation mechanism includes a rotating rod (23), an installation column (12) and an installation frame (20). The rotating rod (23) is rotatably inserted into the middle of the storage cylinder (1), and a motor (6) is installed at its top end. The installation column (12) is fixed on the surface of the rotating rod (23). The installation frames (20) are evenly and fixedly distributed on the surface of the installation column (12). A reinforcing rib (24) is fixed between the bottom end of the installation frame (20) and the surface of the installation column (12). Clamping grooves (9) are formed at both ends of the installation frame (20), and a biodegradable film winding roller (11) is installed inside the installation frame (20); The dust removal and humidity preservation mechanism is arranged below the installation mechanism and includes a filter cotton (10) and a filter cloth (18), which are used to blow out the wet air after filtering and dust removal to the upper installation mechanism to keep the biodegradable film dust-free and in good humidity during storage.

2. The quality-preserving storage device for a biodegradable film according to claim 1, wherein: The dust removal and humidity preservation mechanism further includes a blowing box (8) and a blower (14). A bottom plate (2) is fixed to the bottom end of the storage cylinder (1). The blower (14) is installed on the top end of the bottom plate (2), and an air duct (16) is connected between the side of the blower (14) and the bottom end of the blowing box (8). A support column (7) is fixed to the bottom end of the blowing box (8). Blowing holes (17) are formed at the top end of the blowing box (8). The filter cloth (18) covers the top end of the blowing box (8). The filter cotton (10) is laid on the top end of the filter cloth (18). A water retaining ring (19) is fixed at the edge of the top end of the blowing box (8) and surrounds the outside of the filter cotton (10) with a gap; 3. The biodegradable film quality preservation storage device according to claim 1, characterized in that: Ventilation pipes (4) are vertically arranged on both sides of the top end of the storage cylinder (1). A dust-proof cotton column (5) is plugged into the top end inside the ventilation pipes (4). The middle of the top end of the sealing cylinder (3) is hollow and surrounds the outside of the ventilation pipes (4). The storage cylinder (1) is of a cylindrical structure and is vertically arranged. The pick-up and placement groove (13) is of a rectangular groove structure and is vertically arranged and evenly distributed outside the biodegradable film winding roller (11). Its height is greater than the height of the installation column (12) and less than the height of the storage cylinder (1).

4. A biodegradable film quality preservation storage device according to claim 1, characterized in that: The sealing cylinder (3) is of a cylindrical structure and is arranged vertically. The first sealing ring (15), the second sealing ring (21) and the third sealing ring (22) are all of an annular structure surface, are all arranged horizontally, are all made of sealing rubber material, and all abut against the outer surface of the storage cylinder (1).

5. The biodegradable film quality preservation storage device according to claim 1, characterized in that: The first sealing ring (15) is located at the bottom end of the picking and placing groove (13), the second sealing ring (21) is located at the top end of the picking and placing groove (13), and the third sealing ring (22) abuts against the top end of the storage cylinder (1).

6. The biodegradable film quality preservation storage device according to claim 1, wherein: The rotating rod (23) is arranged vertically. The motor (6) is installed in the middle of the top end of the storage cylinder (1). The mounting column (12) is of a cylindrical structure and is arranged vertically. The mounting frame (20) is of a C-shaped frame structure and is arranged horizontally. The biodegradable film winding roller (11) is arranged horizontally, and its two ends are slidably clamped inside the clamping groove (9).

7. The biodegradable film quality preservation storage device according to claim 2, characterized in that: The bottom plate (2) is of a circular plate structure and is arranged horizontally. The blower (14) is located outside the storage cylinder (1). The air duct (16) passes through the bottom end of the side surface of the storage cylinder (1). The air blowing box (8) is of a circular box structure and is horizontally arranged at the bottom end inside the storage cylinder (1). The rotating rod (23) rotates through the middle of the air blowing box (8).

8. The biodegradable film quality preservation storage device according to claim 2, characterized in that: The air blowing holes (17) are evenly distributed at the top end of the air blowing box (8). The filter cloth (18) covers the air blowing holes (17). The rotating rod (23) rotates through the filter cloth (18) and the filter cotton (10). The filter cloth (18) and the filter cotton (10) are both of a circular structure. The water retaining ring (19) is of an annular structure, and its top end is not higher than the top end of the filter cotton (10).

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