Bag type air filter

Abstract

The invention relates to the technical field of filtering, in particular to a bag type air filter which comprises a main frame part, a warning part, an inner frame part, a supporting frame part and a filtering part, the inner frame part is installed on the inner side of the main frame part, the warning part is installed on the inner side of the main frame part, the supporting frame part is installed on the inner side of the inner frame part, and the filtering part is installed on the supporting frame part. The main frame part comprises an outer frame shell, the inner frame part comprises a base frame located on the inner side of the outer frame shell, a set of multiple lap joint grooves arranged at equal intervals are formed in the position of a left batten of the base frame, rail grooves are formed in the right sides of the opposite faces of a front batten and a rear batten of the base frame, and rail blocks are slidably connected to the inner sides of the rail grooves. A clamping plate is fixedly connected between the opposite ends of the set of rail blocks, the supporting mechanism of the bag type air filter can be repeatedly used through the arranged structures such as the filtering part, the supporting frame part and the inner frame part, and a user can conveniently and rapidly replace a blocked filtering bag.

Description

Technical Field

[0001] The invention relates to the technical field of filtration, in particular to a bag-type air filter. Background Art

[0002] Bag air filters, as a highly efficient air purification equipment, are widely used in industrial, commercial and residential environments to remove particulate matter, dust, pollen, bacteria, viruses and other pollutants in the air to improve air quality. They mainly capture and filter pollutants in the air through their filter bags. These filter bags are usually made of synthetic fibers, polyester fibers, glass fibers or other high-efficiency filter materials, with a large surface area and excellent filtration efficiency. When air passes through the filter, pollutants are intercepted on the surface of the filter bag, while clean air is discharged through the tiny pores of the filter bag.

[0003] Existing bag air filters usually consist of an outer frame (used to support and protect the structure of the entire filter to ensure the stability and durability of the filter), an inner frame (located inside the outer frame to support and fix the filter bag to ensure that the filter bag maintains a stable shape and position during the filtration process), a filter bag and a clamping strip (used to firmly fix the filter bag on the inner frame to prevent displacement or falling off during the filtration process). During the installation process, each filter bag needs to be slowly lowered along the supporting structure of the inner frame to ensure that the filter bag is evenly covered on the inner frame, and then each inner frame with a filter bag is clamped into the outer frame one by one. After that, the inner frames and filter bags between the adjacent ones are fixed by each clip strip. After the clip strip is put on, it is necessary to pinch the two sides of the clip strip with the help of tools to complete the assembly. It can be seen from the above that this installation method is relatively cumbersome, and when replacing the filter bag later, the clip strip needs to be opened with the help of tools, and the clip strip is easy to deform after being removed, which is not convenient for reuse and replacement of the filter bag. On the other hand, when the filter bag is clogged due to excessive dust accumulation after long-term use, the existing bag air filter cannot promptly warn the user to replace it, which affects the air circulation and the filtering effect of the filter. Therefore, a bag air filter is proposed based on the above problems. Summary of the invention

[0004] The object of the present invention is to provide a bag air filter to solve the problem that the supporting mechanism of the existing bag air filter is not convenient for reuse and the filter bag replacement and installation operation is relatively cumbersome.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A bag air filter comprises a main frame, a warning part, an inner frame, a support frame and a filter part, wherein the inner frame is mounted on the inner side of the main frame, the warning part is mounted on the inner side of the main frame, the support frame is mounted on the inner side of the inner frame, and the filter part is mounted on the support frame, the main frame comprises an outer frame shell, the inner frame comprises a base frame located on the inner side of the outer frame shell, a group of multiple equidistantly arranged grooves are provided on the left side slats of the base frame, rail grooves are provided on the right sides of the facing surfaces of the front and rear slats of the base frame, the inner sides of the rail grooves are slidably connected with rail blocks, and a group of card blocks are fixedly connected between the facing ends of the rail blocks The plate, the inner side of the rail groove is installed with a spring, the support frame part includes a group of two rotating blocks rotatably connected to the front and rear slat rotating holes of the base frame, a group of rotating blocks are fixedly connected with a rotating roller on the inner side of the base frame, the right curved surface of the roller is provided with a slot inserted by the clamping plate, the upper side of the roller is fixedly connected with a pressure frame arranged in a horizontal state, the left side of the roller is fixedly connected with a group of multiple support rods, the filter part includes a group of multiple bags each sleeved on the outer side of the support rod, filter bags are knitted and connected between the bags, and the upper side of a group of the bags is fixedly connected with a rubber soft frame on the lower side of the pressure frame.

[0007] Preferably, the left ends of the struts are arranged on the inner side of the lap grooves, the inner width of the lap grooves is the same as the diameter of the struts, and the struts are arranged horizontally.

[0008] Preferably, the width of the press frame is the same as the inner width of the base frame, the front and rear end faces of the press frame fit with the front and rear inner walls of the base frame, the left end of the press frame fits with the left inner wall of the base frame, and the left end of the press frame is provided with a rounded corner.

[0009] Preferably, a distance is provided between the pressing frame and the support rod, the rubber soft frame is provided between the pressing frame and the support rod, the upper end surface of the rubber soft frame is fitted with the lower end surface of the pressing frame, and the opening of the rubber soft frame is aligned with the upper opening of the filter bag.

[0010] Preferably, the rail blocks are arranged on the inner left side of the rail groove, the springs are arranged on the inner right side of the rail groove, the left ends of the springs are fixedly connected to the right end surface of the rail blocks, and the right ends of the springs are fixedly connected to the right inner wall of the rail groove.

[0011] Preferably, both the front and rear sides of the upper end face of the outer frame shell are provided with sunken grooves which are symmetrically arranged on the left and right sides, and the inner curved surfaces of the sunken grooves are fixedly connected to damping pads, and the front and rear end faces of the base frame are fixedly connected to connecting blocks located on the inner sides of the sunken grooves on the left and right sides, and the lower ends of the connecting blocks are fixedly connected to support columns, and the lower ends of the support columns are fixedly connected to the frame plates through the through holes of the outer frame shell, and the outer sides of the support columns are sleeved with support springs located on the inner sides of the sunken grooves, and a rope opening is opened on the right inner wall plate surface of the outer frame shell, and a pull rope is arranged on the inner side of the rope opening, the left end of the pull rope is fixedly connected to the right end of the clamping plate, and the right end of the pull rope is fixedly connected to the inner wall of the outer frame shell, and the warning part comprises a through pipe fixed to the inner side of the outer frame shell, the upper end of the through pipe passes through the frame plate and the outer frame shell and is fixedly connected to a warning whistle, and the front and rear sides of the through pipe are connected to an air intake head located on the lower side of the frame plate.

[0012] Preferably, the inner width of the channel of the outer frame shell is the same as the cross-sectional width of the frame plate, the outer end surface of the frame plate fits with the inner wall of the outer frame shell, the frame plate and the through pipe are slidingly connected, the support springs are arranged on the lower side of the connecting block, and the outer curved surface of the connecting block fits with the damping pad.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. In the present invention, the filter part, the support frame part and the inner frame part are provided so that the support frame part is rotatably arranged in the inner frame part. The support frame part can support the filter part by a sleeve bag sleeved on the outer side of the support rod, and a group of filter bags knitted and connected with each sleeve bag in the filter part can be used to replace multiple filter bags at a time when the user needs to replace them. The support frame part covered can be fixed by the clamping plate, spring and rail block of the inner frame part, thereby completing the fixing of the filter part. When the filter part needs to be replaced, the movable clamping plate can be turned over the support frame part to remove the filter part to be replaced and replace it with a new filter part, and then the support frame part can be reset to make the clamping plate re-inserted to complete the replacement, so that the support mechanism of the bag air filter can be reused, so that the user can quickly and easily replace the blocked filter bag, and solve the problem that the support mechanism of the existing bag air filter is not easy to reuse and the filter bag replacement and installation operation is relatively cumbersome;

[0015] 2. In the present invention, by providing the main frame, warning part and other structures, when the filter bag is blocked and the air circulation is not smooth, the airflow will push the filter bag to move downward, and the support frame part affected by the linkage will drive the inner frame to press down the support column, so that the frame plate moves downward, and the downward movement of the frame plate can press the air on the lower side of the frame plate into the air inlet heads on both sides of the warning part, so that the airflow passes through the air inlet head into the through pipe and is finally discharged from the warning whistle, so that the warning whistle emits a whistle to warn the user, reminding the user that the filter bag has too much dust and needs to be replaced. At the same time, the downward movement of the inner frame will drive the card plate to move downward, and the downward movement of the card plate will cause the air on the lower side of the frame plate to be pressed into the air inlet heads on both sides of the warning part. The position change will be pulled by the pull rope, and the clamping plate will move to the right guided by the rail groove to squeeze the spring, and at the same time break away from the clamping of the clamping groove, so that the support frame can rotate, so that the user can directly flip the support frame open when replacing the filter bag of the filter part later to replace the new filter part. When the filter bag of the bag air filter is blocked, the user can be automatically warned to remind the user that a new filter bag needs to be replaced. This solves the problem that the existing bag air filter cannot promptly warn the user to replace the filter bag when the filter bag is blocked, thereby affecting the air circulation and the filtering effect of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 For the present invention Figure 1 A schematic cross-sectional structure diagram of;

[0018] Figure 3 For the present invention Figure 2 Another perspective structural diagram of;

[0019] Figure 4 It is a structural schematic diagram of the main frame of the present invention;

[0020] Figure 5 For the present invention Figure 4 A schematic cross-sectional structure diagram of;

[0021] Figure 6 It is a structural schematic diagram of the warning part of the present invention;

[0022] Figure 7 For the present invention Figure 1 A schematic diagram of the structure of the main frame portion and the warning portion;

[0023] Figure 8 For the present invention Figure 7 A structural diagram from another perspective;

[0024] Fig. 9 It is a structural schematic diagram of the inner frame of the present invention;

[0025] Fig.10 For the present invention Fig. 9 A schematic diagram of the structure at A;

[0026] Fig.11 It is a structural schematic diagram of the support part and the filter part of the present invention;

[0027] Fig.12 It is a structural schematic diagram of the support frame of the present invention;

[0028] Fig.13 For the present invention Fig.12 Schematic diagram of the structure viewed from above;

[0029] Fig.14 It is a schematic diagram of the structure of the filter unit of the present invention.

[0030] In the figure: 1. main frame; 11. outer frame shell; 12. sink; 13. support column; 14. support spring; 15. frame plate; 16. damping pad; 17. rope mouth; 18. pull rope; 2. warning part; 21. through pipe; 22. air intake head; 23. warning whistle; 3. inner frame; 31. base frame; 32. connecting block; 33. saddle groove; 34. rail groove; 35. rail block; 36. clamping plate; 37. spring; 4. support frame; 41. rotating block; 42. rotating roller; 43. clamping groove; 44. pressing frame; 45. support rod; 5. filtering part; 51. bag; 52. filter bag; 53. rubber soft frame. DETAILED DESCRIPTION

[0031] See also Figure 1-14 , the present invention provides a technical solution:

[0032] A bag air filter comprises a main frame portion 1, a warning portion 2, an inner frame portion 3, a support portion 4 and a filter portion 5, wherein the inner frame portion 3 is mounted on the inner side of the main frame portion 1, the warning portion 2 is mounted on the inner side of the main frame portion 1, the support portion 4 is mounted on the inner side of the inner frame portion 3, and the filter portion 5 is mounted at the support portion 4, the main frame portion 1 comprises an outer frame shell 11, the inner frame portion 3 comprises a base frame 31 located on the inner side of the outer frame shell 11, a group of multiple equidistantly arranged lap grooves 33 are provided at the left side slats of the base frame 31, a rail groove 34 is provided on the right side of the facing surfaces of the front and rear slats of the base frame 31, the inner sides of the rail grooves 34 are all slidably connected with rail blocks 35, a group of opposing ends of the rail blocks 35 are fixedly connected with a clamping plate 36, the inner sides of the rail grooves 34 are all installed with springs 37, the support portion 4 comprises a group of two The front and rear slats of the frame 31 are rotatably connected to the rotating blocks 41, and a group of rotating blocks 41 are fixedly connected to a rotating roller 42 located on the inner side of the base frame 31. A slot 43 inserted by the clamping plate 36 is provided on the right curved surface of the rotating roller 42. A pressing frame 44 arranged in a horizontal state is fixedly connected to the upper side of the rotating roller 42. A group of multiple struts 45 are fixedly connected to the left side of the rotating roller 42. The filter part 5 includes a group of multiple bags 51, which are all sleeved on the outer side of the strut 45. The bags 51 are knitted with filter bags 52. The upper side of a group of bags 51 is fixedly connected to a rubber soft frame 53 located on the lower side of the pressing frame 44; the left ends of the struts 45 are all arranged on the inner side of the groove 33, and the inner width of the groove 33 is the same as the diameter of the strut 45. Through this arrangement, the strut 4 The left end of 5 can be stably supported on the inner side of the groove 33, and the support rods 45 are all arranged horizontally. Through this arrangement, the support rods 45 can laterally support the filter part 5; the width of the pressing frame 44 is the same as the inner width of the base frame 31, and the front and rear end surfaces of the pressing frame 44 are in contact with the front and rear inner walls of the base frame 31. Through this arrangement, the pressing frame 44 pressed into the base frame 31 can form a shell frame with the base frame 31 to fix the filter part 5, and the left end of the pressing frame 44 is in contact with the left inner wall of the base frame 31. The left end of the pressing frame 44 is provided with a rounded corner, and through this arrangement, the pressing frame 44 can be turned out from the base frame 31; a spacing is provided between the pressing frame 44 and the support rod 45, and the rubber soft frame 53 is provided between the pressing frame 44 and the support rod 45, and the upper end surface of the rubber soft frame 53 is in contact with the The lower end surface of the pressure frame 44 is in contact with each other. Through this arrangement, the rubber soft frame 53 can apply damping to position the position of the bag 51 on the one hand, and on the other hand, it can seal and fill the gap between the bag 51 and the pressure frame 44, so that the airflow can only flow through the filter bag 52. The opening of the rubber soft frame 53 is aligned with the upper opening of the filter bag 52. Through this arrangement, the rubber soft frame 53 will not block the opening of the filter bag 52; the rail blocks 35 are all arranged on the inner left side of the rail groove 34, and the springs 37 are all arranged on the inner right side of the rail groove 34. The left ends of the springs 37 are fixedly connected to the right end faces of the rail blocks 35, and the right ends of the springs 37 are fixedly connected to the right inner wall of the rail groove 34. Through this arrangement, the spring 37 can push the card plate 36 to the left through the rail block 35.

[0033] like Figure 2-Figure 6 As shown, both sides of the upper end face of the outer frame shell 11 are provided with symmetrically arranged sink grooves 12, and the inner curved surfaces of the sink grooves 12 are fixedly connected with damping pads 16. Both sides of the front and rear end faces of the base frame 31 are fixedly connected with connecting blocks 32 located on the inner side of the sink grooves 12, and the lower ends of the connecting blocks 32 are fixedly connected with support columns 13. The lower ends of the support columns 13 are fixedly connected with frame plates 15 through the through holes of the outer frame shell 11, and the outer sides of the support columns 13 are sleeved with support springs 14 located on the inner side of the sink grooves 12. A rope opening 17 is provided on the right inner wall plate surface of the outer frame shell 11, and a pull rope 18 is provided on the inner side of the rope opening 17. The left end of the pull rope 18 is fixedly connected to the right end of the clamping plate 36, and the pull rope 1 The right end of the filter bag 52 is fixedly connected to the inner wall of the outer frame shell 11, and the warning part 2 includes a through pipe 21 fixed to the inner side of the outer frame shell 11. The upper end of the through pipe 21 passes through the frame plate 15 and the outer frame shell 11 and is fixedly connected with a warning whistle 23. The front and rear sides of the through pipe 21 are both connected with an air inlet head 22 located at the lower side of the frame plate 15. Through this arrangement, when the filter bag 52 is blocked and the air circulation is not smooth, the airflow will push the filter bag 52 to move downward, and the support frame part 4 affected by the linkage will drive the inner frame part 3 to press the support column 13 downward, so that the frame plate 15 moves downward. The downward movement of the frame plate 15 can press the air on the lower side of the frame plate 15 into the air inlet heads 22 on both sides of the warning part 2, so that the airflow passes through the air inlet head 22 and enters the through pipe 21, and finally discharged from the warning whistle 23, so that the warning whistle 23 emits a whistle to warn the user, reminding the user that the dust in the filter bag 52 is too much and needs to be replaced. At the same time, the downward movement of the inner frame 3 will drive the card plate 36 to move downward, and the position change caused by the downward movement of the card plate 36 will be pulled by the pull rope 18. The card plate 36 will move to the right side with the rail groove 34 as a guide to squeeze the spring 37, and at the same time break away from the clamping of the card groove 43, so that the support frame 4 can be rotated, so that the user can directly flip the support frame 4 when replacing the filter bag 52 of the filter part 5 later to replace the new filter part 5; the inner width dimension of the channel of the outer frame shell 11 and the cross-sectional width dimension of the frame plate 15 The frame plate 15 is of the same size, and the outer end surface of the frame plate 15 is in contact with the inner wall of the outer frame shell 11. Through this arrangement, the frame plate 15 can separate the interior of the outer frame shell 11 into upper and lower areas, so that the air on the lower side can be squeezed when the frame plate 15 moves downward. The frame plate 15 and the through pipe 21 are slidingly connected. Through this arrangement, the displacement of the frame plate 15 is not affected by the through pipe 21. The support springs 14 are all arranged on the lower side of the connecting block 32, and the outer curved surfaces of the connecting block 32 are in contact with the damping pad 16. Through this arrangement, the support springs 14 and the damping pad 16 can apply damping and elastic support force to the connecting block 32, so that the filter bag 52 cannot move downward before the blockage degree that needs to be replaced is reached.

[0034] Working process: The operation of the bag air filter is as follows. It should be noted that the use of this filter requires the outer frame shell 11 to be fixed to the air supply pipeline; the blockage warning operation, first of all, is affected by the damping and elastic support applied by the damping pad 16 and the support spring 14 to the connecting block 32. The unblocked filter bag 52 installed on the inner frame 3 and the support frame 4 can pass the air smoothly during the filtering process and will not be displaced due to the circulation of airflow. The passing air can be filtered and purified through the filter bag 52, so that the pollutant dust particles are intercepted on the surface of the filter bag 52. When the filter bag 52 is blocked due to dust accumulation after a long period of filtering, affecting the filtering effect and the air is difficult to pass through the filter bag 52 due to the blockage, the circulation of air will push the filter bag 52 to move downward, without being affected by the damping and elasticity applied by the damping pad 16 and the support spring 14. At this time, the downward movement of the filter bag 52 will drive the support frame The vent 23 is pressed against the filter 52 and the filter 52 is released, and the filter 52 is then released from the filter 52. The filter 52 is then released from the filter 52 and the filter 52 is then released.To replace and install the filter bag 52, first pinch the pressing frame 44 of the support frame 4, and then flip it to the right, so that the pressing frame 44 drives the support rod 45 to flip out from the base frame 31 of the inner frame 3, and the rotation of the support rod 45 will also drive the filter bags 52 of the filter part 5 to be transferred out of the base frame 31 through the bag 51. At this time, the filter part 5 to be replaced can be pulled out from the support rod 45, and the blocked filter bag 52 is removed. At this time, due to the loss of the thrust applied by the blocked filter bag 52, the spring 37 will expand and reset to push the connecting block 32 to move upward, so that the inner frame 3 is moved upward, and the card plate 36 is moved upward and reset. At this time, the pull rope 18 and the card plate 36 will return to the original distance, so that the spring 37 can expand and reset. At this time, the spring 37 is elastic. The force is reset to push the card plate 36 to the left, so that the card plate 36 fits the outer curved surface of the roller 42. At this time, the sleeve bags 51 of the filter part 5 to be replaced are slid on the support rods 45. After they are completely inserted, the support frame 4 is reset and rotated to make the support frame 4 and the filter part 5 be pressed into the base frame 31 again. The reset rotation of the support frame 4 will make the roller 42 rotate, and the slot 43 displaced with the rotation of the roller 42 will be aligned with the card plate 36, so that the card plate 36 displaced to the left is re-engaged in the slot 43, thereby completing the fixing of the support frame 4, and then completing the fixing of the filter part 5. Through the above operation, the support mechanism of the bag air filter can be reused, so that the user can quickly and easily replace the blocked filter bag 52. ;

[0035] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above are only preferred implementation methods of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A bag air filter, comprising a main frame (1), a warning portion (2), an inner frame (3), a support portion (4) and a filter portion (5), characterized in that: The inner frame portion (3) is mounted on the inner side of the main frame portion (1), the warning portion (2) is mounted on the inner side of the main frame portion (1), the support portion (4) is mounted on the inner side of the inner frame portion (3), and the filter portion (5) is mounted on the support portion (4); the main frame portion (1) comprises an outer frame shell (11); the inner frame portion (3) comprises a base frame (31) located on the inner side of the outer frame shell (11); a group of multiple equidistantly arranged grooves (33) are provided on the left side of the base frame (31); a rail groove (34) is provided on the right side of the facing surfaces of the front and rear slats of the base frame (31); the inner sides of the rail grooves (34) are slidably connected with rail blocks (35); a clamping plate (36) is fixedly connected between the facing ends of a group of the rail blocks (35); and springs (37) are installed on the inner sides of the rail grooves (34). The support frame portion (4) comprises a group of two rotating blocks (41) rotatably connected to the front and rear slat rotating holes of the base frame (31); a group of rotating blocks (41) are fixedly connected to a rotating roller (42) located on the inner side of the base frame (31); a right curved surface of the rotating roller (42) is provided with a clamping groove (43) into which a clamping plate (36) is inserted; the upper side of the rotating roller (42) is fixedly connected to a pressing frame (44) arranged in a horizontal state; the left side of the rotating roller (42) is fixedly connected to a group of multiple support rods (45); the filtering portion (5) comprises a group of multiple bags (51) all sleeved on the outer side of the support rods (45); filter bags (52) are knitted and connected between the bags (51); and the upper side of a group of bags (51) is fixedly connected to a rubber soft frame (53) located on the lower side of the pressing frame (44).

2. A bag air filter according to claim 1, characterized in that: The left ends of the support rods (45) are arranged on the inner side of the lap groove (33), the inner width of the lap groove (33) is the same as the diameter of the support rods (45), and the support rods (45) are arranged horizontally.

3. A bag air filter according to claim 1, characterized in that: The width dimension of the pressing frame (44) is the same as the inner width dimension of the base frame (31); the front and rear end surfaces of the pressing frame (44) are in contact with the front and rear inner walls of the base frame (31); the left end of the pressing frame (44) is in contact with the left inner wall of the base frame (31); and the left end of the pressing frame (44) is provided with a rounded corner.

4. A bag air filter according to claim 1, characterized in that: A spacing is provided between the pressing frame (44) and the support rod (45); the rubber soft frame (53) is provided between the pressing frame (44) and the support rod (45); the upper end surface of the rubber soft frame (53) is in contact with the lower end surface of the pressing frame (44); and the opening of the rubber soft frame (53) is aligned with the upper opening of the filter bag (52).

5. A bag air filter according to claim 1, characterized in that: The rail blocks (35) are arranged on the left side inside the rail groove (34), the springs (37) are arranged on the right side inside the rail groove (34), the left ends of the springs (37) are fixedly connected to the right end surface of the rail blocks (35), and the right ends of the springs (37) are fixedly connected to the right inner wall of the rail groove (34).

6. A bag air filter according to claim 1, characterized in that: The upper end face of the outer frame shell (11) is provided with symmetrically arranged grooves (12) on both the front and rear sides, and the inner curved surfaces of the grooves (12) are fixedly connected with damping pads (16). The front and rear end faces of the base frame (31) are fixedly connected with connecting blocks (32) located inside the grooves (12) on both the left and right sides, and the lower ends of the connecting blocks (32) are fixedly connected with support columns (13). The lower ends of the support columns (13) pass through the through holes of the outer frame shell (11) and are fixedly connected with frame plates (15). The outer sides of the support columns (13) are sleeved with support springs (14) located inside the grooves (12). A rope opening (17) is provided on the right inner wall surface of the shell (11), a pull rope (18) is provided inside the rope opening (17), the left end of the pull rope (18) is fixedly connected to the right end of the clamping plate (36), and the right end of the pull rope (18) is fixedly connected to the inner wall of the outer frame shell (11), the warning part (2) comprises a through pipe (21) fixed to the inner side of the outer frame shell (11), the upper end of the through pipe (21) passes through the frame plate (15) and the outer frame shell (11) and is fixedly connected to a warning whistle (23), and the front and rear sides of the through pipe (21) are both connected to an air intake head (22) located on the lower side of the frame plate (15).

7. A bag air filter according to claim 6, characterized in that: The inner width of the channel of the outer frame shell (11) is the same as the cross-sectional width of the frame plate (15); the outer end surface of the frame plate (15) is in contact with the inner wall of the outer frame shell (11); the frame plate (15) and the through pipe (21) are slidably connected; the support springs (14) are arranged on the lower side of the connecting block (32); and the outer curved surface of the connecting block (32) is in contact with the damping pad (16).

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