A new type of high temperature resistant pleated filter bag

Abstract

The present invention belongs to the technical field of pleated filter bags, and discloses a novel high-temperature resistant pleated filter bag, including a body, wherein an air inlet pipe is installed at the bottom of one side of the body, when high-temperature flue gas enters the interior of the filter gas, the internal chamber of the corrugated water tank is extended to generate negative pressure to suck the water inside the main shaft rod for replenishment, and when the cooling mechanism moves down along the interior of the filter bag to the bottom and then is driven by the reversal of the motor to drive the ring to rise while driving the cooling mechanism to rise, at this time, the cooling mechanism will drive the third water pipe and the bottom support rod to start squeezing the corrugated water tank, so that in the process of the cooling mechanism rising, the nozzle on one side of the cooling mechanism will squeeze the water pressure of the C area squeezed out by the rising corrugated water tank and spray it to the inner wall of the filter bag in atomized form to effectively cool down and reduce the ignition point of the filter bag surface, and at the same time, the water mist sprayed through the atomization contains gas and will produce an impact vibration effect on the inner wall of the filter bag, and at this time, the dust that is easy to fall off on the outer surface of the filter bag will fall to the top of the material receiving mechanism for collection.

Description

Technical Field

[0001] The invention belongs to the technical field of pleated filter bags, in particular to a novel high-temperature resistant pleated filter bag. Background Art

[0002] Pleated filter bags are pleated filter bags used to filter waste inside the dust collectors in every factory. They mainly consist of a filter bag body and clamping rings installed on the top and bottom of the filter bag. They are widely used in coal plants.

[0003] The existing pleated filter bag is clamped on both sides of the filter bag body with gravity by the staff to prevent the filter bag from being blown by the gas during operation and unable to work. Then, the top of the clamped filter bag is placed along the internal pipe of the dust collector to clamp the clamping ring on the top of the filter bag with the top of the pipe. Finally, the filter bag is suspended in the pipe for gas filtering.

[0004] In the process of existing pleated filter bags filtering coal plant flue gas, a large amount of high-temperature flue gas is generated by the operation of the coal plant boiler. A large amount of high-temperature flue gas contains a large amount of burned dry coal powder, which enters along the pipeline and reaches the surface of the pleated filter bag. In the process of the pleated filter bag filtering a large amount of high-temperature flue gas, the dry coal powder in the high-temperature flue gas will adhere to the surface of the filter bag and accumulate. Because the ignition point of the dry coal powder in the high-temperature flue gas is not high and it is accumulated on the surface of the filter bag, it will cause the subsequent high-temperature flue gas to enter the pipeline and inhale the surface of the filter bag, causing the originally accumulated dry coal powder on the surface of the filter bag to produce small sparks, thereby causing holes to be burned on the surface of the filter bag.

[0005] Based on the above problems, therefore, a new type of high temperature resistant pleated filter bag is needed. Summary of the invention

[0006] In order to solve the problems raised in the above-mentioned background technology, the present invention provides a new type of high-temperature resistant pleated filter bag to solve the problem that a large amount of high-temperature flue gas is generated by the operation of the coal plant boiler. The large amount of high-temperature flue gas contains a large amount of burned dry coal powder, which enters along the pipeline and reaches the surface of the pleated filter bag. During the filtration process of the large amount of high-temperature flue gas by the pleated filter bag, the dry coal powder in the high-temperature flue gas will adhere to the surface of the filter bag and accumulate. Because the ignition point of the dry coal powder in the high-temperature flue gas is not high and it is accumulated on the surface of the filter bag, it will cause the subsequent high-temperature flue gas to enter the pipeline and inhale the surface of the filter bag, causing the originally accumulated dry coal powder on the surface of the filter bag to produce small sparks, thereby causing the surface of the filter bag to be burned.

[0007] To achieve the above object, the present invention provides the following technical solution: a novel high temperature resistant pleated filter bag, comprising a body, an air inlet pipe is installed at the bottom of one side of the body, an exhaust pipe is connected to the top of the body in an array, the inner wall of the body is fixedly connected to the filter gas, and an A component is correspondingly arranged in the inner wall pipeline of the filter gas;

[0008] The A component arranged on the inner wall pipeline of the gas filter includes a support plate ring, a cylindrical part, a filter bag, and a material receiving mechanism;

[0009] The bottom outer edge of the support plate ring is detachably connected to the top of the gas filtering inner wall pipeline, and the support plate ring vertically suspends the A component in the gas filtering pipeline.

[0010] Preferably, the inner wall of the support plate ring is fixedly connected to the cylindrical member, the inner wall of the cylindrical member is fixedly connected to the second water tank through a support rod, the top of the second water tank is fixedly connected to the first water pipe, the top of the first water pipe is fixedly connected to the first water tank body, and a handle is installed on the top of the first water tank body.

[0011] Preferably, the inner wall of the second water tank is fixedly connected to the motor, the bottom output shaft of the motor is fixedly connected to the main shaft rod through a bent rod, the bottom of the second water tank is fixedly connected to the second water pipe through a rotatable disc, and the bottom of the second water pipe is fixedly connected to the water delivery disc.

[0012] Preferably, the outer edge of the water delivery tray is fixedly connected to the top inner wall of the main shaft, a chamber is opened on the inner wall of the water delivery tray, and a mesh is opened at the bottom of the inner chamber of the water delivery tray, the bottom edge of the water delivery tray is fixedly connected to the corrugated water tank, and the outer surface of the corrugated water tank is in contact with the top inner wall of the main shaft.

[0013] Preferably, the bottom of the corrugated water tank is fixedly connected to a third water pipe, one side of the third water pipe passes through a slide groove on the bottom surface of the main shaft rod and is fixedly connected to a cooling mechanism, the center of the bottom of the corrugated water tank is fixedly connected to a bottom support rod, the bottom surface of the bottom support rod is connected to a sliding rod in a ring-shaped distribution, and one side of the sliding rod is slidably engaged with the slide groove corresponding to the inner wall of the main shaft rod.

[0014] Preferably, an atomizing nozzle is installed on the outer surface of one side of the cooling mechanism, the overall diameter of the cooling mechanism is smaller than the inner wall diameter of the filter bag, the top of the cooling mechanism is fixedly connected to the inner sweeping mechanism through a support rod, and the overall diameter of the inner sweeping mechanism is smaller than the inner wall diameter of the filter bag.

[0015] Preferably, the inner wall of the cooling mechanism is fixedly connected to a circular ring through a support rod, the inner wall rotating shaft of the circular ring is connected to a threaded rod sleeve, and the inner wall of the threaded rod sleeve on the inner wall of the circular ring is movably connected to the main shaft rod.

[0016] Preferably, the top ring of the filter bag is connected to the threaded telescopic rod through a slat shaft, the top shaft of the threaded telescopic rod is connected to a support rod member, and the top of the support rod member is fixedly connected to the outer surface of the second water tank.

[0017] Preferably, the bottom thread of the threaded telescopic rod is connected to the threaded rod, and the surface of the threaded rod at the bottom of the threaded telescopic rod is connected to the rotating shaft of the outer surface plate at the top of the filter bag, the rotating shaft of the top outer surface of the threaded telescopic rod is connected to the sub-gear, the outer surface of the sub-gear drives and meshes with the main gear, the inner wall of the main gear is fixedly connected to the main shaft rod, the surface of the bottom support rod of the threaded telescopic rod is fixedly connected to the outer sweep ring, and the inner wall of the outer sweep ring fits with the surface of the filter bag.

[0018] Preferably, the outer edge of the bottom clamping ring of the filter bag is fixedly connected to the external material ring, the outer edge of the external material ring is fixedly connected to the material mechanism, the bottom of the material receiving mechanism can be threadedly detachably connected to the bottom cover, the interior of the material receiving mechanism receives the dust falling inside the filter bag, and the bottom of the external material ring is provided with a mesh.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] When the high-temperature flue gas enters the interior of the filter bag, the flue gas will reach the surface of the filter bag for filtration along the internal pipeline of the filter bag, and the staff will start the motor. At this time, the motor will drive the main shaft to rotate through the output shaft. At this time, the water inside the first water tank will first reach the inside of the second water tank along the first water pipe, and then the second water pipe at the bottom of the second water tank will transfer the water to the inside of the water delivery tray, and then the water delivery tray will transfer the water to the inside of the corrugated water tank inside the main shaft. Then, the main shaft rotates to select the surface threaded rod sleeve to move downward. During the downward movement of the threaded rod sleeve on the surface of the main shaft, it will drive the ring to move downward. The downward movement of the ring pushes the cooling mechanism to move downward along the inside of the filter bag. At this time, the cooling mechanism drives the third water pipe to move downward along the inside of the filter bag The bottom support rod pulls the inner part of the corrugated water tank to extend. At this time, the inner chamber of the corrugated water tank is extended to generate negative pressure to suck the water inside the main shaft rod for replenishment. When the cooling mechanism moves down along the inside of the filter bag to the bottom and then is driven by the reversal of the motor to drive the ring to rise and drive the cooling mechanism to rise at the same time, the cooling mechanism will drive the third water pipe and the bottom support rod to start squeezing the corrugated water tank. During the rising process of the cooling mechanism, the nozzle on one side of the cooling mechanism will squeeze the water pressure of the C area squeezed out by the rising corrugated water tank and sprayed on the inner wall of the filter bag in atomized form to effectively cool down and reduce the ignition point of the filter bag surface. At the same time, the water mist sprayed out through atomization contains gas, which will produce an impact vibration effect on the inner wall of the filter bag. At this time, the dust that is easy to fall off on the outer surface of the filter bag will fall to the top of the material receiving mechanism for collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 It is a schematic cross-sectional view of the machine body of the present invention;

[0023] Figure 3 This is a schematic diagram of the gas filter pipeline A component of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the gas filter pipeline A component of the present invention;

[0025] Figure 5 It is a cross-sectional schematic diagram of the support plate ring of the present invention;

[0026] Figure 6 It is a schematic diagram of the main gear of the present invention;

[0027] Figure 7 It is a schematic cross-sectional view of the outer sweep ring of the present invention;

[0028] Figure 8 This is a schematic diagram of the top of the main shaft rod of the present invention;

[0029] Fig. 9 This is a schematic diagram of the cooling mechanism B area of ​​the present invention;

[0030] Fig.10 It is a cross-sectional schematic diagram of the cooling mechanism of the present invention;

[0031] Fig.11 Schematic diagram of the slide bar of the present invention

[0032] Fig.12 It is a schematic diagram of the external material ring of the present invention.

[0033] In the figure: 1, machine body; 2, exhaust pipe; 3, air inlet pipe; 4, filter gas; 5, support plate ring; 6, first water tank body; 7, cylindrical member; 8, filter bag; 9, material receiving mechanism; 10, first water pipe; 11, motor; 12, water delivery tray; 13, second water tank; 14, second water pipe; 15, support rod member; 16, secondary gear; 17, threaded telescopic rod; 18, cooling mechanism; 19, outer sweep ring; 20, inner sweep mechanism; 21, circular ring; 22, main gear; 23, main shaft rod; 24, corrugated water tank; 25, third water pipe; 26, bottom support rod; 27, sliding rod member; 28, external material ring; 29, bottom cover. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figures 1 to 12 As shown, the present invention provides a new type of high temperature resistant pleated filter bag, including a body 1, an air inlet pipe 3 is installed at the bottom of one side of the body 1, the top of the body 1 is connected to the exhaust pipe 2 in an array distribution, the inner wall of the body 1 is fixedly connected to the filter gas 4, and the inner wall pipeline of the filter gas 4 is correspondingly provided with an A component;

[0036] The A component arranged on the inner wall pipeline of the filter gas 4 includes a support plate ring 5, a cylindrical member 7, a filter bag 8, and a material receiving mechanism 9;

[0037] The bottom outer edge of the support plate ring 5 is detachably connected to the top of the inner wall pipeline of the filter gas 4, and the support plate ring 5 vertically suspends the A component in the pipeline of the filter gas 4;

[0038] The inner wall of the support plate ring 5 is fixedly connected to the cylindrical member 7, the inner wall of the cylindrical member 7 is fixedly connected to the second water tank 13 through a support rod, the top of the second water tank 13 is fixedly connected to the first water pipe 10, the top of the first water pipe 10 is fixedly connected to the first water tank body 6, and a handle is installed on the top of the first water tank body 6;

[0039] The inner wall of the second water tank 13 is fixedly connected to the motor 11, the bottom output shaft of the motor 11 is fixedly connected to the main shaft 23 through a bent rod, the bottom of the second water tank 13 is fixedly connected to the second water pipe 14 through a rotatable disc, the bottom of the second water pipe 14 is fixedly connected to the water delivery tray 12, the outer edge of the water delivery tray 12 is fixedly connected to the top inner wall of the main shaft 23, the inner wall of the water delivery tray 12 is provided with a chamber, and the bottom of the inner chamber of the water delivery tray 12 is provided with a mesh, the bottom edge of the water delivery tray 12 is fixedly connected to the corrugated water tank 24, and the outer surface of the corrugated water tank 24 is in contact with the top inner wall of the main shaft 23;

[0040] The bottom of the corrugated water tank 24 is fixedly connected to the third water pipe 25, one side of the third water pipe 25 passes through the slide groove on the bottom surface of the main shaft rod 23 and is fixedly connected to the cooling mechanism 18, the bottom center of the corrugated water tank 24 is fixedly connected to the bottom support rod 26, the bottom surface of the bottom support rod 26 is annularly distributed and connected to the sliding rod 27, one side of the sliding rod 27 is slidably engaged with the inner wall of the main shaft rod 23 in the corresponding slide groove;

[0041] An atomizing nozzle is installed on the outer surface of one side of the cooling mechanism 18. The overall diameter of the cooling mechanism 18 is smaller than the inner wall diameter of the filter bag 8. The top of the cooling mechanism 18 is fixedly connected to the inner sweeping mechanism 20 through a support rod. The overall diameter of the inner sweeping mechanism 20 is smaller than the inner wall diameter of the filter bag 8. The inner wall of the cooling mechanism 18 is fixedly connected to the ring 21 through a support rod. The inner wall of the ring 21 is connected to the threaded rod sleeve and is movably connected to the main shaft 23.

[0042] The top ring of the filter bag 8 is connected to the threaded telescopic rod 17 through a slat shaft, the top shaft of the threaded telescopic rod 17 is connected to the support rod 15, and the top of the support rod 15 is fixedly connected to the outer surface of the second water tank 13.

[0043] During use, after the high-temperature flue gas enters the interior of the filter gas 4, the flue gas will reach the surface of the filter bag 8 along the internal pipeline of the filter gas 4 for filtration, and the staff will start the motor 11. At this time, the motor 11 will drive the main shaft rod 23 to rotate through the output shaft. At this time, the water inside the first water tank body 6 will first reach the inside of the second water tank 13 along the first water pipe 10, and then the second water pipe 14 at the bottom of the second water tank 13 will transfer the water to the inside of the water delivery tray 12, and then the water delivery tray 12 will transfer the water to the inside of the corrugated water tank 24 inside the main shaft rod 23. Then, the main shaft rod 23 is rotated to select the surface threaded rod sleeve to move downward. During the downward movement of the threaded rod sleeve on the surface of the main shaft rod 23, the ring 21 will be driven to move downward. The downward movement of the ring 21 pushes the cooling mechanism 18 to move downward along the inside of the filter bag 8. At this time, the cooling mechanism 18 drives the second water tank 6 to move downward along the inside of the filter bag 8. The third water pipe 25 and the bottom support rod 26 pull and extend the inside of the corrugated water tank 24. At this time, the internal chamber of the corrugated water tank 24 is extended to generate negative pressure to suck the water inside the main shaft rod 23 for replenishment. When the cooling mechanism 18 moves down to the bottom along the inside of the filter bag 8 and then is driven by the reverse rotation of the motor 11 to drive the ring 21 to rise and drive the cooling mechanism 18 to rise at the same time, at this time, the cooling mechanism 18 will drive the third water pipe 25 and the bottom support rod 26 to start squeezing the corrugated water tank 24, so that in the process of the cooling mechanism 18 rising, the nozzle on one side of the cooling mechanism 18 will squeeze the C area under the pressure of the rising corrugated water tank 24 and spray it to the inner wall of the filter bag 8 in atomized form to effectively cool down and reduce the ignition point of the surface of the filter bag 8. At the same time, the water mist sprayed out through atomization contains gas, which will produce an impact vibration effect on the inner wall of the filter bag 8. At this time, the dust that is easy to fall off on the outer surface of the filter bag 8 will fall to the top of the material receiving mechanism 9 for collection.

[0044] The above is further explained that the rotating disc at the bottom of the second water tank 13 is connected to the second water pipe 14 so that the second water pipe 14 can drive the disc at the bottom of the second water tank 13 to rotate together during the rotation of the second water tank 13 to prevent the second water pipe 14 from getting tangled.

[0045] It is further explained that during the upward movement and squeezing process of the corrugated water tank 24, the water body will be squeezed into the third water pipe 25 through the internal saturated water pressure, and then the third water pipe 25 will transmit the water body to the area B inside the cooling mechanism 18 and squeeze it through the atomizing nozzle on the surface of the cooling mechanism 18 to be sprayed out.

[0046] like Figures 6 to 12 As shown, the threaded rod 17 is threadedly connected to the threaded rod at the bottom, and the threaded rod surface at the bottom of the threaded rod 17 is connected to the top outer surface strip plate of the filter bag 8 via a rotating shaft, the top outer surface of the threaded rod 17 is connected to the secondary gear 16 via a rotating shaft, the outer surface of the secondary gear 16 is transmission-engaged with the main gear 22, the inner wall of the main gear 22 is fixedly connected to the main shaft rod 23, the bottom support rod surface of the threaded rod 17 is fixedly connected to the outer sweep ring 19, and the inner wall of the outer sweep ring 19 is in contact with the surface of the filter bag 8;

[0047] The outer edge of the bottom clamp ring of the filter bag 8 is fixedly connected to the external material ring 28, and the outer edge of the external material ring 28 is fixedly connected to the material receiving mechanism 9. The bottom of the material receiving mechanism 9 can be threadedly detachably connected to the bottom cover 29. The interior of the material receiving mechanism 9 receives the dust falling from the filter bag 8, and a mesh is provided at the bottom of the external material ring 28.

[0048] During use, when the motor 11 drives the main shaft 23 to rotate through the output shaft, the threaded rod sleeve on the surface of the main shaft 23 drives the ring 21 and the outer sweeping ring 20 to descend and sweep along the inner wall of the filter bag 8. At the same time, the main gear 22 driven by the rotation of the main shaft 23 transmits the sub-gear 16, so that the second water pipe 14 drives the threaded telescopic rod 17 to rotate. Subsequently, during the rotation of the threaded telescopic rod 17, the bottom rod will spirally descend along the top strip of the filter bag 8. During the descending process of the bottom rod of the cylindrical part 7, the outer sweeping ring 19 is driven to descend and sweep along the outer surface of the filter bag 8, thereby effectively reducing the ignition point caused by the accumulation of dry coal powder on the surface of the filter bag 8 in the flue gas.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel high temperature resistant pleated filter bag, comprising a body (1), characterized in that: An air intake pipe (3) is installed at the bottom of one side of the machine body (1), exhaust pipes (2) are connected to the top of the machine body (1) in an array arrangement, a gas filter (4) is fixedly connected to the inner wall of the machine body (1), and a component A is correspondingly arranged in the inner wall pipe of the gas filter (4); The A component arranged on the inner wall pipeline of the gas filter (4) comprises a support plate ring (5), a cylindrical member (7), a filter bag (8), and a material receiving mechanism (9); The bottom outer edge of the support plate ring (5) is detachably connected to the top of the inner wall pipeline of the gas filter (4), and the support plate ring (5) vertically suspends the A component in the pipeline of the gas filter (4); The inner wall of the support plate ring (5) is fixedly connected to the cylindrical member (7), the inner wall of the cylindrical member (7) is fixedly connected to the second water tank (13) via a support rod, the top of the second water tank (13) is fixedly connected to the first water pipe (10), the top of the first water pipe (10) is fixedly connected to the first water tank body (6), and a handle is installed on the top of the first water tank body (6); The inner wall of the second water tank (13) is fixedly connected to the motor (11), the bottom output shaft of the motor (11) is fixedly connected to the main shaft rod (23) via a bent rod, the bottom of the second water tank (13) is fixedly connected to the second water pipe (14) via a rotatable disc, and the bottom of the second water pipe (14) is fixedly connected to the water delivery disc (12); The outer edge of the water delivery tray (12) is fixedly connected to the top inner wall of the main shaft (23); a cavity is provided on the inner wall of the water delivery tray (12); and mesh holes are provided at the bottom of the inner cavity of the water delivery tray (12); the bottom edge of the water delivery tray (12) is fixedly connected to the corrugated water tank (24); and the outer surface of the corrugated water tank (24) is in contact with the top inner wall of the main shaft (23); The bottom of the corrugated water tank (24) is fixedly connected to a third water pipe (25), one side of the third water pipe (25) passes through a sliding groove on the bottom surface of the main shaft rod (23) and is fixedly connected to a cooling mechanism (18), the center of the bottom of the corrugated water tank (24) is fixedly connected to a bottom support rod (26), the bottom surface of the bottom support rod (26) is connected to a sliding rod (27) in an annular distribution, and one side of the sliding rod (27) is slidably engaged with the inner wall of the main shaft rod (23) in a corresponding sliding groove; An atomizing nozzle is installed on the outer surface of one side of the cooling mechanism (18); the overall diameter of the cooling mechanism (18) is smaller than the inner wall diameter of the filter bag (8); the top of the cooling mechanism (18) is fixedly connected to the inner sweeping mechanism (20) via a support rod; the overall diameter of the inner sweeping mechanism (20) is smaller than the inner wall diameter of the filter bag (8); The inner wall of the cooling mechanism (18) is fixedly connected to a circular ring (21) via a support rod, the inner wall rotation axis of the circular ring (21) is connected to a threaded rod sleeve, and the inner wall of the threaded rod sleeve on the inner wall of the circular ring (21) is movably connected to a main shaft rod (23).

2. The novel high temperature resistant pleated filter bag according to claim 1 is characterized in that: The top ring of the filter bag (8) is connected to a threaded telescopic rod (17) via a strip plate shaft, the top shaft of the threaded telescopic rod (17) is connected to a support rod (15), and the top of the support rod (15) is fixedly connected to the outer surface of the second water tank (13).

3. The novel high temperature resistant pleated filter bag according to claim 2 is characterized in that: The bottom of the threaded telescopic rod (17) is threadedly connected to a threaded rod, and the surface of the threaded rod at the bottom of the threaded telescopic rod (17) is connected to the top outer surface strip plate rotation axis of the filter bag (8), the top outer surface rotation axis of the threaded telescopic rod (17) is connected to the secondary gear (16), the outer surface of the secondary gear (16) is transmission-engaged with the main gear (22), the inner wall of the main gear (22) is fixedly connected to the main shaft rod (23), the bottom support rod surface of the threaded telescopic rod (17) is fixedly connected to the outer sweep ring (19), and the inner wall of the outer sweep ring (19) is in contact with the surface of the filter bag (8).

4. The novel high temperature resistant pleated filter bag according to claim 3 is characterized in that: The outer edge of the bottom clamp ring of the filter bag (8) is fixedly connected to the external material ring (28), the outer edge of the external material ring (28) is fixedly connected to the material mechanism (9), the bottom of the material mechanism (9) can be threadedly detachably connected to the bottom cover (29), the interior of the material mechanism (9) receives dust falling from the inside of the filter bag (8), and the bottom of the external material ring (28) is provided with a mesh hole.

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