CN116036745A

CN116036745A - Air filtering equipment

Info

Publication number: CN116036745A
Application number: CN202310093923.5A
Authority: CN
Inventors: 刘源源; 方曦
Original assignee: Shanghai Institute of Technology
Current assignee: Shanghai Institute of Technology
Priority date: 2023-02-05
Filing date: 2023-02-05
Publication date: 2023-05-02

Abstract

The invention provides air filtering equipment, which comprises a cylindrical barrel, wherein an arc-shaped plate with a central angle of 180 degrees is attached to the inner wall of a right semicircle of the barrel, a rotating shaft which is rotationally connected is arranged on the central axis of the barrel, two partition plates which are positioned on the same diameter of the barrel are fixed on the side wall of the rotating shaft, a plurality of elastic filter plates which are distributed on two sides of the partition plates are fixed on the outer wall of the rotating shaft, a poking plate is fixed on the inner wall of the bottom of a left semicircle of the barrel, a drain pipe is connected to the bottom of the left semicircle of the barrel, an air inlet pipe and an air outlet pipe are respectively connected to the top and the bottom of the right semicircle of the barrel, a motor is fixed on the outer wall of one end of the barrel.

Description

Air filtering equipment

Technical Field

The invention relates to the technical field of air purification, in particular to air filtering equipment.

Background

With the rapid development of industry, the energy consumption is gradually increased, the emission of air pollutants is correspondingly increased, the environmental quality is greatly influenced, in recent years, the national importance is attached to environmental protection, the emission control of factory waste gas in cities is more and more strict, and enterprises go to in daily productionA large amount of smoke dust is generated, if the smoke dust is directly discharged into the air, the surrounding environment is obviously influenced, the health of surrounding people is seriously endangered, and for this purpose, an air filtering device is needed to filter the pollutants in the factory during the production of the factory _。

CN107514699a discloses an air purifying device for factory, which realizes the function of filtering and exhausting fresh air in factory, but in the technical scheme provided by the patent, the filtering layer has more attached plugs along with purification, so that the filtering layer needs to be manually detached for cleaning, and the air in factory itself has more pollutants than other places, thus resulting in higher frequency and more trouble of manual cleaning.

Disclosure of Invention

Accordingly, an object of the present invention is to provide an air filtering apparatus, which solves all or one of the above-mentioned problems of the related art.

Based on the above object, the invention provides an air filtering device, which comprises a cylindrical barrel, wherein an arc plate with a central angle of 180 degrees is attached to the inner wall of a right semicircle of the barrel, a rotating shaft which is rotationally connected is arranged on the central axis of the barrel, two clapboards which are positioned on the same diameter of the barrel are fixed on the side wall of the rotating shaft, a plurality of elastic filter plates which are distributed on two sides of the clapboards are fixed on the outer wall of the rotating shaft, two ends of the elastic filter plates and the clapboards are attached to the inner walls of two ends of the barrel, one sides of the elastic filter plates and one side of the clapboards are attached to the inner walls of the arc plate, a poking piece is fixed on the inner wall of the bottom of the left semicircle of the barrel, a sewage drain pipe is connected to the bottom of the left semicircle of the barrel, an air inlet pipe and an air outlet pipe are respectively connected to the top and the bottom of the right semicircle of the barrel, a motor is fixed on the outer wall of one end of the barrel, and the output shaft of the motor is fixedly connected with the rotating shaft.

Optionally, the elastic filter plates at two sides of the partition board are 3-5 blocks.

Optionally, the elasticity filter is including fixing in epaxial fixing base, the fixing base cross-section is C shape, the elasticity filter still includes square frame shape's elastic frame, the elastic frame is made by the spring leaf, the inboard of elastic frame is fixed with filter screen one, the one end of elastic frame inserts the opening inboard of fixing base and passes through the bolt locking and fix.

Optionally, a support arm is fixed at the bottom of the fixing seat, and an aligned first bump is fixed at the bottom of one side of the elastic frame away from the rotating shaft and the upper end of the support arm.

Optionally, sealing strips I are attached to the edges of two ends of the elastic frame and one side far away from the rotating shaft.

Optionally, a spraying seat is fixed at the top of the left semicircle of the cylinder body, and a water supply pipe is connected to the spraying seat.

Optionally, the vertical intercommunication has the connecting pipe between air-supply line and the play tuber pipe, the inside of connecting pipe is fixed with the filter screen, be provided with respectively on the one end that air-supply line and play tuber pipe are close to the barrel and control its push-pull valve two of switching, be provided with on the connecting pipe and control its push-pull valve one of switching.

Optionally, the filter screen is including fixing the extension board on the connecting pipe inner wall, be provided with the fixed frame of articulated connection on the extension board, the inboard of fixed frame is fixed with filter screen two, be provided with the torsional spring of order about the fixed block to overturn upwards on the hinge of fixed frame and extension board, the inner wall of connecting pipe is fixed with electronic reel, the rope of electronic reel is kept away from the one end bottom of extension board with the fixed frame and is connected, fixed with the lug two of alignment on the one end top that the extension board was kept away from to the fixed frame and the inner wall of connecting pipe, fixed frame and extension board laminating are on the inner wall of connecting pipe, the through-hole has been seted up on the outer wall of connecting pipe, the through-hole is located the side of extension board, be provided with the detachable side cap of connecting on the through-hole.

Optionally, laminating has sealing strip two on the inner wall of connecting pipe, the both ends of fixed frame and the one side of keeping away from the extension board laminate respectively on sealing strip two.

Optionally, the extension board slope sets up, one side of extension board laminating connecting pipe inner wall is lower end, the lower end and the through-hole bottom parallel and level of extension board.

From the above, the filtering equipment provided by the invention has the advantages that the rotating shaft is rotated to enable each elastic filter plate to sequentially pass through the poking sheets, and the elastic potential energy of the elastic filter plates is released to promote the elastic filter plates to shake off dust particles adhered to the elastic filter plates, so that the equipment is not required to be frequently opened by workers for cleaning, the automation degree is higher, and the labor is saved and the maintenance is convenient.

Drawings

For a clearer description of one or more embodiments of the present description or of the solutions of the prior art, the drawings that are necessary for the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are only one or more embodiments of the present description, from which other drawings can be obtained, without inventive effort, for a person skilled in the art.

FIG. 1 is a schematic view showing the internal structure of a filtering apparatus of the present invention;

FIG. 2 is a schematic view showing the external structure of the filtering apparatus of the present invention;

FIG. 3 is a schematic view of an elastic filter plate according to the present invention;

fig. 4 is a schematic view showing the internal structure of the connection pipe of the present invention.

1, a cylinder; 2. a rotating shaft; 3. an elastic filter plate; 4. a pulling piece; 5. a blow-down pipe; 6. an air inlet pipe; 7. an arc-shaped plate; 8. a partition plate; 9. a first gate valve; 10. a second gate valve; 11. a connecting pipe; 12. an air outlet pipe; 13. a motor; 14. a first filter screen; 15. an elastic frame; 16. a first sealing strip; 17. a support arm; 18. a first bump; 19. an electric reel; 20. a second sealing strip; 21. a second bump; 22. a second filter screen; 23. a fixed frame; 24. a support plate; 25. a side cover; 26. a spray seat; 27. a fixing seat.

Detailed Description

For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made in detail to the following specific examples.

It is noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present disclosure should be taken in a general sense as understood by one of ordinary skill in the art to which the present disclosure pertains. The use of the terms "first," "second," and the like in one or more embodiments of the present description does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

The invention provides air filtering equipment, which comprises a cylindrical barrel 1, wherein an arc-shaped plate 7 with a central angle of 180 degrees is attached to the inner wall of a right semicircle of the barrel 1, a rotating shaft 2 which is rotationally connected is arranged on the central axis of the barrel 1, two baffle plates 8 which are positioned on the same diameter of the barrel 1 are fixed on the side wall of the rotating shaft 2, a plurality of elastic filter plates 3 which are distributed on two sides of the baffle plates 8 are fixed on the outer wall of the rotating shaft 2, two ends of the elastic filter plates 3 and the baffle plates 8 are attached to the inner walls of two ends of the barrel 1, one side of each elastic filter plate 3 and one side of the baffle plate 8 are attached to the inner wall of the arc-shaped plate 7, a shifting piece 4 is fixed on the inner wall of the bottom of the left semicircle of the barrel 1, a sewage drain pipe 5 is connected to the bottom of the left semicircle of the barrel 1, an air inlet pipe 6 and an air outlet pipe 12 are respectively connected to the top and the bottom of the right semicircle of the barrel 1, a motor 13 is fixed on the outer wall of one end of the barrel 1, and an output shaft of the motor 13 is fixedly connected with the rotating shaft 2.

As shown in fig. 1-4, the invention provides an air filtering device, which is mainly used for filtering and purifying air with more smoke dust in a factory, and mainly comprises a cylindrical barrel 1, wherein an arc-shaped plate 7 is attached to the inner wall of a right semicircle in the barrel 1, the central angle of the arc-shaped plate 7 is 180 degrees, a rotating shaft 2 which is rotationally connected is arranged on the central axis of the barrel 1, a motor 13 is fixed on the outer wall of the barrel 1, the motor 13 is used for driving the rotating shaft 2 to rotate, two baffle plates 8 are fixed on the side wall of the rotating shaft 2, the two baffle plates 8 are positioned on the same diameter of the barrel 1, the two baffle plates 8 divide the interior of the barrel 1 into two chambers, a plurality of elastic filter plates 3 are fixed on the outer wall of the rotating shaft 2, the elastic filter plates 3 are respectively attached to the two chambers on the two sides of the baffle plates 8, the two ends of the elastic filter plates 3 and the baffle plates 8 are respectively attached to the inner walls of the two ends of the barrel 1, one side of the elastic filter plates 3 and one side of the baffle plates 8 are not communicated with the inner wall of the arc-shaped plate 7, as shown in fig. 1, when the baffle plates 8 are in a vertical state, the two chambers of the barrel 8 are not communicated, the top and the bottom of the right semicircle of the barrel 1 are respectively connected with an air inlet 6 and the bottom of the left semicircle 1, the bottom is fixedly provided with a left semicircle duct 4, and a bottom of a blow-down duct is respectively.

The use principle of the equipment is as follows: the air through hole blower to be filtered and purified is sent into the air inlet pipe 6 and sequentially passes through a plurality of elastic filter plates 3 of a right semicircle in the cylinder 1, a filter screen is arranged on the elastic filter plates 3, and as dust particles are filtered, the filtered air is discharged from the air outlet pipe 12, so that the purification and filtration of the air in a factory can be completed, as the service time is prolonged, dust particles attached to the filter screen on the elastic filter plates 3 are gradually increased and accumulated on the upward side of the filter screen, the air passing speed is influenced, the filtration effect is reduced, therefore, the motor 13 can drive the rotating shaft 2 to rotate, taking the view angle of fig. 1 as an example, the motor 13 drives the rotating shaft 2 to rotate clockwise, the elastic filter plates 3 are attached to the inner wall of the arc 7 when the arc 7 is arranged at the inner side of the arc 7, the elastic filter plates 3 divide the right semicircle of the cylinder 1 into a plurality of chambers, the air passes through the elastic filter plates 3 one by one for purifying and filtering, when the elastic filter plate 3 rotates to the left semicircle of the cylinder body 1, a certain gap is reserved between the elastic filter plate 3 and the inner wall of the cylinder body 1, so when the elastic filter plate 3 in the right semicircle rotates to the left semicircle, one surface of the elastic filter plate 3, which is adhered with dust particles, faces downwards, when the elastic filter plate 3 passes through the poking plate 4, the elastic filter plate 3 is bent, and the elastic filter plate 3 finally passes through the poking plate 4 along with the continuous rotation of the rotating shaft 2 and releases elastic potential energy so as to enable the elastic filter plate 3 to shake continuously, dust particles on the elastic filter plate 3 shake off into the drain pipe 5 at the bottom of the cylinder body 1 through continuous shake, the elastic filter plate 3 in the right semicircle passes through the poking plate 4 one by one and completes self treatment, and the elastic filter plate 3 in the left semicircle rotates to the right semicircle to perform air filtering operation, and the motor 13 drives the rotating shaft 2 to rotate 180 degrees at intervals, the self-cleaning of the elastic filter plates 3 is performed, and the elastic filter plates 3 on both sides of the partition plate 8 alternately participate in the air filtering operation, so that a worker does not need to frequently disassemble the apparatus to perform the manual cleaning process of the filter member.

In summary, according to the filtering device provided by the invention, each elastic filter plate 3 sequentially passes through the poking plate 4 by rotating the rotating shaft 2, and the elastic potential energy of the elastic filter plate 3 is released to promote the elastic filter plate to shake off dust particles adhered to the elastic filter plate, so that a worker does not need to frequently open the device to clean, the degree of automation is higher, and the labor is saved and the maintenance is convenient.

In some alternative embodiments, the elastic filter plates 3 on both sides of the partition plate 8 are 3-5 blocks.

The number of the elastic filter plates 3 corresponds to the number of the filter layers, and is generally set to 3-5, so that a higher filtering effect on air can be maintained and the air filtering speed is ensured.

In some alternative embodiments, the elastic filter plate 3 includes a fixing seat 27 fixed on the rotating shaft 2, the section of the fixing seat 27 is C-shaped, the elastic filter plate 3 further includes a square elastic frame 15, the elastic frame 15 is made of a spring sheet, a filter screen 14 is fixed on the inner side of the elastic frame 15, and one end of the elastic frame 15 is inserted into the inner side of the opening of the fixing seat 27 and is locked and fixed by a bolt.

As shown in fig. 3, the elastic filter plate 3 mainly includes a fixing seat 27 and an elastic frame 15, the fixing seat 27 is fixed on the outer wall of the rotating shaft 2 in a bolt locking manner, the elastic frame 15 is inserted into the inner side of the opening of the fixing seat 27, the elastic frame 15 is made of a spring piece, and can be bent and recovered to be original, the first filter screen 14 is arranged on the inner side of the elastic frame 15, and is mainly used for filtering smoke dust particles in air, when the filter plate is cleaned by itself, the elastic frame 15 is blocked by the poking plate 4 to be bent, and then the elastic frame starts to shake continuously after passing over the poking plate 4, so that dust on the surface of the first filter screen 14 is shaken off.

In some alternative embodiments, the bottom of the fixing seat 27 is fixed with a support arm 17, and a first aligned bump 18 is fixed on the bottom of one side of the elastic frame 15 away from the rotating shaft 2 and the upper end of the support arm 17.

When the first filter screen 14 is cleaned, the support arm 17 passes over the pulling piece 4, the elastic frame 15 is propped against the pulling piece 4 to bend, then the elastic frame 15 passes over the pulling piece 4, after the elastic frame 15 passes over the pulling piece 4, the elastic frame rapidly rotates towards the support arm 17, so that the first bump 18 on the elastic frame 15 and the first bump 18 on the support arm 17 collide with each other, the elastic frame 15 is immediately stopped by strong collision, dust particles on the first filter screen 14 rapidly fall off due to collision and inertia, the self-cleaning effect of the first filter screen 14 is further improved, and the dust particles on the first filter screen 14 are rapidly and thoroughly sprung down.

In some alternative embodiments, the sealing strips 16 are attached to the edges of the two ends of the elastic frame 15 away from the rotating shaft 2.

The elastic frame 15 is better attached to the arc-shaped plate 7 and the inner wall of the cylinder body 1 by additionally arranging the first sealing strip 16, so that the sealing performance of the edge of the elastic frame 15 is improved, and when the filtering is performed, air can be ensured to pass through the first filter screen 14 in the elastic frame 15 one by one, and the multi-layer filtering effect is improved.

In some alternative embodiments, a spray seat 26 is fixed at the top of the left semicircle of the cylinder 1, and a water supply pipe is connected to the spray seat 26.

When the rotating shaft 2 rotates 180 degrees, the cleaning operation of the elastic filter plate 3 is completed, the elastic filter plate 3 rotating to the left semicircle is sprayed by the spraying seat 26 to further improve the cleaning effect of the elastic filter plate 3, so that the first filter screen 14 is cleaned, and the cleaned sewage is discharged from the sewage discharge pipe 5, so that the first filter screen 14 can be cleaned more thoroughly.

In some alternative embodiments, a connecting pipe 11 is vertically communicated between the air inlet pipe 6 and the air outlet pipe 12, a filter screen is fixed in the connecting pipe 11, two gate valves 10 for controlling the opening and the closing of the air inlet pipe 6 and the air outlet pipe 12 are respectively arranged at one ends of the air inlet pipe 6 and the air outlet pipe 12 close to the cylinder 1, and a first gate valve 9 for controlling the opening and the closing of the connecting pipe 11 is arranged on the connecting pipe.

The rotating shaft 2 rotates 180 degrees at intervals to clean the elastic filter plate 3, the connecting pipe 11 and other parts are additionally arranged for keeping air purification operation in the cleaning process, the second gate valve 10 is in an open state during daily air purification operation, the first gate valve 9 is in a closed state, air enters the cylinder 1 from the air inlet pipe 6 and is discharged from the air outlet pipe 12, the rotating shaft 2 starts to rotate when the elastic filter plate 3 is cleaned, meanwhile, the first gate valve 9 is opened, the second gate valve 10 is closed, so that air briefly enters from the air inlet pipe 6 and then enters the connecting pipe 11 and is discharged from the air outlet pipe 12, when the air passes through the connecting pipe 11, the filter screen is used for brief filtration, the rotating shaft 2 rotates 180 degrees at a high speed, after the rotation is completed, the first gate valve 9 is closed again, the second gate valve 10 is opened, the air is conveyed from the original route, the elastic filter plate 3 still filters the air in the cleaning process by additionally arranging the parts such as the connecting pipe 11, and the equipment does not need to stop conveying the air.

In some alternative embodiments, the filter screen includes the extension board 24 fixed on the inner wall of the connecting pipe 11, be provided with the fixed frame 23 of articulated connection on the extension board 24, the inboard of fixed frame 23 is fixed with the filter screen two 22, be provided with the torsional spring that drives the fixed block and upwards overturn on the hinge of fixed frame 23 and extension board 24, the inner wall of connecting pipe 11 is fixed with electric reel 19, the rope of electric reel 19 is connected with the one end bottom that the extension board 24 was kept away from to fixed frame 23, the one end top that the extension board 24 was kept away from to fixed frame 23 is fixed with the lug two 21 of alignment on the inner wall of connecting pipe 11, fixed frame 23 and extension board 24 laminating are on the inner wall of connecting pipe 11, the through-hole has been seted up on the outer wall of connecting pipe 11, the through-hole is located the side of extension board 24, be provided with on the through-hole and dismantle connect side cap 25.

As shown in fig. 4, the fixed frame 23 is hinged to the support plate 24, and the hinge shaft is sleeved with a torsion spring, the torsion spring provides torque for driving the fixed frame 23 to turn upwards, the use frequency of the connecting pipe 11 is low, so that the filtered air amount is less, but the use time is increased at any time, a large amount of dust particles are adhered to the second filter screen 22, during daily operation, the fixed frame 23 is pulled by the electric reel 19 in a telescopic manner, so that the fixed frame 23 and the support plate 24 are attached to the inner wall of the connecting pipe 11, the air is filtered by the second filter screen 22 when passing through, the dust particles are left on the upper surface of the second filter screen 22, when the second filter screen 22 needs to be cleaned, the electric reel 19 stops pulling the fixed frame 23, the fixed frame 23 rapidly turns upwards under the action of the torsion spring, so that the second bump 21 on the fixed frame 23 is mutually impacted with the second bump 21 on the inner wall of the connecting pipe 11, and the dust on the second filter screen 22 is shaken off to the support plate 24 by the impact, thus the cleaning operation of the second filter screen 22 is completed, and when the accumulated dust on the support plate 24 is more, the dust on the side cover 24 is opened, and the dust can be collected after passing through the support plate 24.

In some alternative embodiments, the second sealing strip 20 is attached to the inner wall of the connecting pipe 11, and two ends of the fixing frame 23 and one side far away from the support plate 24 are respectively attached to the second sealing strip 20.

The sealing performance between the fixed frame 23 and the inner wall of the connecting pipe 11 is better through the sealing strip II 20, air is ensured to only pass through the filter screen II 22, when the filter screen II 22 is cleaned, the fixed frame 23 is turned upwards, after the fixed frame 23 leaves the sealing strip II 20, the edge of the fixed frame 23 is not blocked, the fixed frame 23 can be turned rapidly, the bump II 21 is ensured to be impacted rapidly, and dust is shaken down.

In some alternative embodiments, the support plate 24 is obliquely arranged, one side of the support plate 24, which is attached to the inner wall of the connecting pipe 11, is a lower end, and the lower end of the support plate 24 is flush with the bottom of the through hole.

The supporting plate 24 is inclined, dust collected on the supporting plate 24 flows to the through holes along the inclined plane, and the dust is directly discharged by opening the side cover 25, so that the dust collecting device is more convenient.

The foregoing describes specific embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description.

The present disclosure is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the one or more embodiments of the disclosure, are therefore intended to be included within the scope of the disclosure.

Claims

1. The utility model provides an air filtration equipment, its characterized in that, including columniform barrel (1), the laminating has arc (7) that the central angle is 180 degrees on the right semicircle inner wall of barrel (1), be provided with pivot (2) of rotating the connection on the central axis of barrel (1), be fixed with two baffle (8) that are located on barrel (1) same diameter on pivot (2) lateral wall, be fixed with a plurality of elastic filter board (3) of distribution in baffle (8) both sides on the outer wall of pivot (2), the both ends of elastic filter board (3) and baffle (8) all laminate with the both ends inner wall of barrel (1), one side of elastic filter board (3) and baffle (8) all laminates with the inner wall of arc (7), the left semicircle bottom inner wall of barrel (1) is fixed with plectrum (4), the left semicircle bottom of barrel (1) is connected with blow off pipe (5), the right semicircle top and the bottom of barrel (1) are connected with air-supply line (6) respectively and play tuber pipe (12), the one end of motor (1) is fixed with output shaft (13) of motor (13).

2. An air filtration device according to claim 1, characterized in that the number of elastic filter plates (3) on both sides of the partition (8) is 3-5.

3. The air filtering device according to claim 2, wherein the elastic filter plate (3) comprises a fixed seat (27) fixed on the rotating shaft (2), the section of the fixed seat (27) is C-shaped, the elastic filter plate (3) further comprises a square frame-shaped elastic frame (15), the elastic frame (15) is made of a spring piece, a filter screen I (14) is fixed on the inner side of the elastic frame (15), and one end of the elastic frame (15) is inserted into the inner side of an opening of the fixed seat (27) and is locked and fixed through a bolt.

4. An air filtering device according to claim 3, wherein the bottom of the fixing seat (27) is fixed with a support arm (17), and a first aligned lug (18) is fixed on the bottom of one side of the elastic frame (15) away from the rotating shaft (2) and the upper end of the support arm (17).

5. An air filtering device according to claim 4, wherein the sealing strips I (16) are attached to the edges of the two ends of the elastic frame (15) and the side far away from the rotating shaft (2).

6. The air filtering device according to claim 1, wherein a spray seat (26) is fixed at the top of the left semicircle of the cylinder (1), and a water supply pipe is connected to the spray seat (26).

7. The air filtering device according to claim 1, wherein a connecting pipe (11) is vertically communicated between the air inlet pipe (6) and the air outlet pipe (12), a filter screen is fixed inside the connecting pipe (11), two gate valves (10) for controlling the opening and the closing of the air inlet pipe (6) and the air outlet pipe (12) are respectively arranged at one ends, close to the cylinder (1), of the air inlet pipe, and a first gate valve (9) for controlling the opening and the closing of the connecting pipe is arranged on the connecting pipe (11).

8. The air filtering device according to claim 7, wherein the filter screen comprises a support plate (24) fixed on the inner wall of the connecting pipe (11), a fixing frame (23) connected in a hinged mode is arranged on the support plate (24), a second filter screen (22) is fixed on the inner side of the fixing frame (23), a torsion spring for driving the fixing block to turn upwards is arranged on a hinge shaft of the fixing frame (23) and the support plate (24), an electric reel (19) is fixed on the inner wall of the connecting pipe (11), a rope of the electric reel (19) is connected with the bottom of one end of the fixing frame (23) away from the support plate (24), an aligned second bump (21) is fixed on the top of one end of the fixing frame (23) away from the support plate (24) and the inner wall of the connecting pipe (11), a through hole is formed in the outer wall of the connecting pipe (11), the through hole is located on the side of the support plate (24), and a detachable connection (25) is arranged on the through hole.

9. The air filtering device according to claim 8, wherein the second sealing strip (20) is attached to the inner wall of the connecting pipe (11), and two ends of the fixing frame (23) and one side far away from the support plate (24) are attached to the second sealing strip (20) respectively.

10. The air filtering device according to claim 9, wherein the support plate (24) is obliquely arranged, one side of the support plate (24) attached to the inner wall of the connecting pipe (11) is a lower end, and the lower end of the support plate (24) is flush with the bottom of the through hole.