CN219091481U - Material dust recovery device - Google Patents

Abstract

The utility model provides a material dust recovery device, which comprises a material tank, a sealing cover, a filter screen, a pulse type bag dust collector and a filter element, wherein the side part of the material tank is communicated with a discharge pipe, the top of the discharge pipe is communicated with an extension pipe extending upwards, the extension pipe is provided with a through cavity communicated with the inside of the discharge pipe, and the outer end of the discharge pipe is provided with a first flange plate; the sealing cover is detachably connected to the upper end of the extension pipe; the filter screen is arranged on the discharging pipe is internally provided with a discharging pipe; the pulse type bag dust collector is arranged at one side of the material tank, a feeding pipe communicated with the discharging pipe is arranged at the side part of the pulse type bag dust collector, and a second flange plate is arranged at the outer end of the feeding pipe; the filter element is arranged between the first flange plate and the second flange plate and is connected with the first flange plate and the second flange plate through the connecting element. The material dust recovery device provided by the utility model can timely detach and clean impurities on the filter screen and the filter piece, improves the purity of recovered dust, and reduces the recovery cost.

Description

Material dust recovery device

Technical Field

The utility model belongs to the technical field of dust recovery equipment, more particularly, to a material dust recovery device.

Background

When throwing in chemical material to the melt device, volatile dust, in order to avoid the material dust to escape to the external circumstances that produces extravagant, generally absorb the dust of escape in order to carry out recycle with the form of negative pressure through pulse sack cleaner.

At present, in order to avoid that too much large-particle-size materials are also sucked into the pulse type cloth bag dust collector, a filter piece is welded in a pipeline connected with a material tank of the pulse type cloth bag dust collector to filter the large-particle-size materials, but after the pulse type cloth bag dust collector is used for a long time, impurities are easy to adhere to the filter piece, the filter piece cannot be detached and cleaned, so that a large amount of impurities are doped in recovered dust, the purity of the recovered dust is reduced, the recovered dust cannot be directly recovered and applied to production, purification or purification treatment is needed, and the recovery cost is increased.

Disclosure of Invention

The embodiment of the utility model provides a material dust recycling device, which can timely detach and clean impurities on a filter element, improves the purity of recycled dust and reduces the recycling cost.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a material dust recovery unit, including material jar, closing cap, filter screen, pulsed sack cleaner and filter element, the material jar lateral part intercommunication has the discharging pipe, and the top intercommunication of discharging pipe has the extension pipe that upwards extends, and the extension pipe has the through-cavity with the inside intercommunication of discharging pipe, and the outer end of discharging pipe is equipped with first ring flange; the sealing cover is detachably connected to the upper end of the extension pipe and used for sealing the through cavity; the surface of the filter screen is perpendicular to the main shaft of the discharge pipe and is arranged in the discharge pipe, the filter screen extends upwards into the extension pipe, and the upper edge of the filter screen is connected with the bottom wall of the sealing cover; the pulse type bag dust collector is arranged at one side of the material tank, a feeding pipe communicated with the discharging pipe is arranged at the side part of the pulse type bag dust collector, and a second flange plate is arranged at the outer end of the feeding pipe; the filter element is arranged between the first flange plate and the second flange plate and is connected with the first flange plate and the second flange plate through the connecting piece, and the plate surface of the filter element is perpendicular to the main shaft of the feeding pipe.

In one possible implementation, a cleaning member for cleaning the filter screen is connected to one side edge of the filter screen, which is close to the material tank, in a vertically sliding manner.

In some embodiments, a sliding rail extending along the up-down direction is arranged on one side of the filter screen close to the material tank, the cleaning piece comprises a brush and a screw rod, and the brush is connected to the sliding rail in a sliding manner along the up-down direction; the screw rod penetrates through the sealing cover along the up-down direction and is rotationally connected with the sealing cover, the screw rod penetrates through the hairbrush along the up-down direction and is in threaded connection with the hairbrush, and the screw rod can rotate to drive the hairbrush to move up and down.

In some embodiments, the outer peripheral edge of the filter screen is provided with a frame, the outer edge of the frame is provided with a collecting part which is bent and extended to one side close to the material tank to collect materials, and the collecting part is arranged close to the lower part of the filter screen.

In some embodiments, the collecting part is an arc-shaped slat which protrudes downwards and is attached to the inner wall of the discharging pipe, and the inner peripheral wall of the arc-shaped slat is provided with a collecting groove with an upward opening.

In some embodiments, the frame comprises two vertical parts and an arc-shaped part, wherein the two vertical parts are connected to the bottom surface of the sealing cover at intervals along the radial direction of the discharging pipe and extend downwards, and the two vertical parts are respectively used for being in butt fit with two opposite inner side walls of the extension pipe; the lower ends of the two vertical parts are respectively connected with two ends of the arc-shaped part and are downwards protruded, and the bottom wall of the arc-shaped part is used for being in butt fit with the inner peripheral wall of the discharging pipe.

In one possible implementation manner, the outer peripheral wall of the first flange plate is provided with a first installation groove with an outward opening, the outer peripheral wall of the second flange plate is provided with a second installation groove with an outward opening and arranged in one-to-one correspondence with the first installation groove, the outer peripheral wall of the filter element is provided with a third installation groove with an outward opening and in one-to-one correspondence with the first installation groove, and the first flange plate, the filter element and the second flange plate are connected through a connecting element penetrating through the first installation groove, the second installation groove and the third installation groove.

In one possible implementation manner, the connecting piece comprises a first screw rod and a second screw rod, the first screw rod is connected to one side wall of the filtering piece, which is close to the first flange plate, and extends outwards perpendicular to the plate surface of the first flange plate, the first screw rod penetrates through the first flange plate, and a first nut is sleeved at the outer end thread of the first screw rod; the second screw rod is connected to one side wall of the filter element, which is close to the second flange plate, and is perpendicular to the plate surface of the first flange plate, and extends outwards, the second screw rod penetrates through the second flange plate, and a second nut is sleeved at the outer end of the second screw rod.

In one possible implementation, the cover and the extension tube are connected by a fixing member penetrating the cover in the up-down direction and being screwed with the upper end of the extension tube.

In one possible implementation, the filter element comprises an annular frame and a filter cloth arranged in the annular frame, the annular frame is connected with the first flange plate and the second flange plate through connecting pieces.

Compared with the prior art, the material dust recycling device provided by the embodiment has the advantages that when the filter screen needs to be cleaned, the filter screen can be taken out from the extension pipe and cleaned by disassembling the fixing piece and taking the sealing cover; when the filter piece needs to be cleaned, the filter piece can be taken out and cleaned only by detaching the connecting piece to separate the first flange plate from the second flange plate. Through this kind of setting method, impurity on dismantling clearance filter screen and the filter element that can be timely has improved the purity degree of the dust of retrieving, has reduced recovery cost.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a front cross-sectional structure of a material dust recycling device according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a partial enlarged structure at I in FIG. 1 according to an embodiment of the present utility model;

FIG. 3 is a right side view of the filter screen, cleaning member, collection portion and cover of FIG. 1 according to an embodiment of the present utility model;

FIG. 4 is a schematic top view of the collecting portion in FIG. 3 according to an embodiment of the present utility model;

FIG. 5 is a right side view of the filter element of FIG. 1 according to an embodiment of the present utility model;

FIG. 6 is a schematic left-hand structural view of the first flange plate of FIG. 1 according to an embodiment of the present utility model;

FIG. 7 is a right side view of the second flange of FIG. 1 according to an embodiment of the present utility model;

FIG. 8 is a schematic front sectional view of another embodiment of a connecting member, a first flange, a second flange, and a filter in a dust recycling apparatus according to an embodiment of the present utility model;

FIG. 9 is a right side view of the filter element of FIG. 8 according to an embodiment of the present utility model;

FIG. 10 is a schematic left-hand view of the first flange of FIG. 8 according to an embodiment of the present utility model;

fig. 11 is a right-side view of the second flange in fig. 8 according to an embodiment of the present utility model.

Wherein, each reference sign in the figure:

10. a material tank; 11. a discharge pipe; 111. a first flange; 112. a first mounting groove; 12. an extension tube; 121. a through cavity; 20. a cover; 30. a filter screen; 31. a frame; 311. a vertical portion; 312. an arc-shaped portion; 32. a slide rail; 40. a pulse type cloth bag dust collector; 41. a feed pipe; 411. a second flange; 412. a second mounting groove; 50. a filter; 51. an annular frame; 511. a third mounting groove; 52. a filter cloth; 60. a connecting piece; 61. a bolt; 62. a third nut; 63. a first screw; 64. a first nut; 65. a second screw; 66. a second nut; 70. a fixing member; 80. cleaning the piece; 81. a screw rod; 82. a brush; 90. a collection section; 91. a collection tank.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or be indirectly on the other element. It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present utility model. The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a number" is two or more, unless explicitly defined otherwise.

Referring to fig. 1 to 11, a material dust recycling apparatus provided by the present utility model will now be described. The material dust recycling device comprises a material tank 10, a sealing cover 20, a filter screen 30, a pulse type bag-type dust collector 40 and a filter element 50, wherein the side part of the material tank 10 is communicated with a discharge pipe 11, the top of the discharge pipe 11 is communicated with an extension pipe 12 extending upwards, the extension pipe 12 is provided with a through cavity 121 communicated with the inside of the discharge pipe 11, and the outer end of the discharge pipe 11 is provided with a first flange plate 111; the sealing cover 20 is detachably connected to the upper end of the extension pipe 12 and is used for sealing the through cavity 121; the surface of the filter screen 30 is perpendicular to the main shaft of the discharge pipe 11 and is arranged in the discharge pipe 11, the filter screen 30 extends upwards into the extension pipe 12, and the upper edge of the filter screen 30 is connected with the bottom wall of the sealing cover 20; the pulse type bag-type dust collector 40 is arranged on one side of the material tank 10, a feed pipe 41 communicated with the discharge pipe 11 is arranged on the side part of the pulse type bag-type dust collector 40, and a second flange 411 is arranged at the outer end of the feed pipe 41; the filter element 50 is disposed between the first flange 111 and the second flange 411, and is connected to the first flange 111 and the second flange 411 through the connecting element 60, and the plate surface of the filter element 50 is perpendicular to the main axis of the feed pipe 41.

The embodiment of the application provides a material dust recovery unit, in its in-service use, firstly deliver the material to the material intraductal, then open pulse sack cleaner 40 and absorb the dust in the material jar 10, the dust gets into in the discharging pipe 11 after the filtration of filter screen 30, again in the filter element 50's filtration back gets into pulse sack cleaner 40 through inlet pipe 41, retrieves the dust.

When the filter screen 30 needs to be cleaned, the filter screen 30 can be taken out from the extension pipe 12 and cleaned by disassembling the sealing cover 20; when the filter element 50 needs to be cleaned, the filter element 50 can be taken out and cleaned only by detaching the connecting element 60 to separate the first flange 111 and the second flange 411. Through this kind of setting method, impurity on dismantling clearance filter screen 30 and filter element 50 that can be timely has improved the purity degree of the dust of retrieving, has reduced recovery cost.

Compared with the prior art, in the material dust recycling device provided by the embodiment, when the filter screen 30 needs to be cleaned, the filter screen 30 can be taken out from the extension pipe 12 and cleaned by disassembling the fixing piece 70 and taking up the sealing cover 20; when the filter element 50 needs to be cleaned, the filter element 50 can be taken out and cleaned only by detaching the connecting element 60 to separate the first flange 111 and the second flange 411. Through this kind of setting method, impurity on dismantling clearance filter screen 30 and filter element 50 that can be timely has improved the purity degree of the dust of retrieving, has reduced recovery cost.

In one possible implementation, the filter screen 30 is configured as shown in fig. 1 to 3, and referring to fig. 1 to 3, a cleaning member 80 for cleaning the filter screen 30 is slidably connected to a side of the filter screen 30 adjacent to the material tank 10 up and down.

Specifically, the cleaning member 80 is used for cleaning the filter screen 30, and when the filter screen 30 is not detached, the filter screen 30 can be prevented from being blocked by large-particle-size materials or impurities by cleaning the cleaning member 80 by sliding up and down; when the filter screen 30 is disassembled, the cleaning piece 80 can also be used for cleaning the large-particle-size materials or impurities on the filter screen 30, so that the practicability is improved.

In some embodiments, referring to fig. 1 to 3, a side of the filter screen 30, which is close to the material tank 10, is provided with a sliding rail 32 extending in an up-down direction, the cleaning member 80 includes a brush 82 and a screw rod 81, and the brush 82 is slidingly connected to the sliding rail 32 in the up-down direction; the screw rod 81 penetrates through the sealing cover 20 in the up-down direction and is in rotary connection with the sealing cover 20, the screw rod 81 penetrates through the hairbrush 82 in the up-down direction and is in threaded connection with the hairbrush 82, and the screw rod 81 can rotate to drive the hairbrush 82 to move up and down.

Specifically, two slide rails 32 are provided, and are respectively located on both sides of the screw 81. When the filter screen 30 is cleaned, the hairbrush 82 can move up and down along the sliding rail 32 only by rotating the screw rod 81, so that the filter screen 30 is cleaned, the filter screen 30 is cleaned conveniently, and the filtering effect of the filter screen 30 is ensured.

In some embodiments, referring to fig. 1 to 4, the outer peripheral edge of the filter screen 30 is provided with a frame 31, and the outer edge of the frame 31 is provided with a collecting portion 90 bent and extended toward one side near the material tank 10 to collect the material, and the collecting portion 90 is disposed near the lower portion of the filter screen 30.

Specifically, the collecting portion 90 is used for containing cleaned impurities or materials, when the cleaning member 80 cleans the filter screen 30, the impurities or materials fall into the collecting portion 90, so that the mixture of the impurities and the materials is prevented from entering the pulse bag-type dust collector 40, and then the impurities or materials in the collecting portion 90 can be cleaned by disassembling the filter screen 30.

In some embodiments, referring to FIGS. 1-4, the collecting portion 90 is a downwardly convex arcuate strip that engages the inner wall of the tapping pipe 11 and has an upwardly open collecting channel 91 in the inner peripheral wall thereof.

Specifically, the collecting tank 91 is used for containing impurities or materials cleaned by the cleaning member 80, and the arc-shaped slat can guide the fallen impurities or materials, so that the impurities or materials reach the bottom of the collecting portion 90, and the impurities or materials are prevented from falling into the discharging pipe 11.

In some embodiments, referring to fig. 1 to 3, the frame 31 includes two vertical portions 311 and an arc portion 312, the two vertical portions 311 are connected to the bottom surface of the cover 20 along the radial direction of the tapping pipe 11 at intervals and extend downward, and the two vertical portions 311 are respectively used for abutting and matching with two opposite inner side walls of the extension pipe 12; the two ends of the arc-shaped part 312 are respectively connected with the lower ends of the two vertical parts 311 and are downwards protruded, and the bottom wall of the arc-shaped part 312 is used for being in butt fit with the inner peripheral wall of the discharging pipe 11.

Specifically, the side walls of the two vertical portions 311 far away from each other are respectively abutted with the inner side wall of the extension pipe 12, and the bottom wall of the arc portion 312 is abutted with the inner bottom wall of the discharge pipe 11, so that gaps are avoided between the filter screen 30 and the inner wall of the discharge pipe 11, and the filtering effect is improved.

Meanwhile, the vertical portions 311 and the arc portions 312 facilitate the arrangement of the filter screen 30, two side edges of the filter screen 30 are respectively connected with opposite side walls of the two vertical portions 311, the upper edge of the filter screen 30 is connected with the bottom wall of the sealing cover 20, and the lower edge of the filter screen 30 is connected with the inner peripheral wall of the arc portions 312, so that the strength of the filter screen 30 is enhanced.

In one possible implementation manner, the first flange 111 adopts a structure as shown in fig. 1 and 2 and fig. 5 to 7, referring to fig. 1 and 2 and fig. 5 to 7, a first mounting groove 112 with an outward opening is provided on an outer peripheral wall of the first flange 111, a second mounting groove 412 with an outward opening and provided in one-to-one correspondence with the first mounting groove 112 is provided on an outer peripheral wall of the second flange 411, a third mounting groove 511 with an outward opening and provided in one-to-one correspondence with the first mounting groove 112 is provided on an outer peripheral wall of the filter element 50, and the first flange 111, the filter element 50 and the second flange 411 are connected by a connecting element 60 penetrating the first mounting groove 112, the second mounting groove 412 and the third mounting groove 511.

Specifically, the connection member 60 includes a bolt 61 and a third nut 62 screwed with the bolt 61. When the filter element is dismounted, the first flange 111 and the second flange 411 can be dismounted only by slightly loosening the bolts 61 and the third nuts 62 and horizontally moving the openings (the outer sides of the first flange 111, the filter element 50 and the second flange 411) of the first mounting groove 112, the second mounting groove 412 and the third mounting groove 511, and the filter element 50 can be taken out, so that the quick dismounting of the filter element 50 is realized, and the dismounting efficiency is improved.

In one possible implementation manner, the connecting piece 60 adopts a structure as shown in fig. 8 to 11, referring to fig. 8 to 11, the connecting piece 60 includes a first screw 63 and a second screw 65, the first screw 63 is connected to a side wall of the filter 50 near the first flange 111, and extends outwards perpendicular to the plate surface of the first flange 111, the first screw 63 penetrates through the first flange 111, and a first nut 64 is sleeved on an outer end thread of the first screw 63; the second screw 65 is connected to a side wall of the filter element 50 near the second flange 411, and extends outwards perpendicular to the plate surface of the first flange 111, the second screw 65 penetrates through the second flange 411, and a second nut 66 is sleeved on the outer end of the second screw 65.

Specifically, the first screw 63 and the second screw 65 are respectively fixed on the side wall of the filter element 50, the first screw 63 and the first nut 64 are used for fixing the first flange 111 and the filter element 50, and the second screw 65 and the second nut 66 are used for fixing the second flange 411 and the filter element 50, so that the filter element 50 is respectively connected with the first flange 111 and the second flange 411, the sealing performance between the filter element 50 and the first flange 111 and the second flange 411 is enhanced, and leakage of dust at the joint is avoided.

In one possible implementation, the cover 20 and the extension pipe 12 are configured as shown in fig. 1 and 2, and referring to fig. 1 and 2, the cover 20 and the extension pipe 12 are connected by a fixing member 70, and the fixing member 70 penetrates the cover 20 in the up-down direction and is screwed to the upper end of the extension pipe 12.

Specifically, the fixing member 70 enhances the sealing performance between the cover 20 and the extension pipe 12, and avoids leakage of dust at the joint.

In one possible implementation manner, the filter 50 adopts a structure as shown in fig. 1 and 2 and fig. 5 and 9, and referring to fig. 1 and 2 and fig. 5 and 9, the filter 50 includes an annular frame 51 and a filter cloth 52 disposed in the annular frame 51, and the annular frame 51 is connected to the first flange 111 and the second flange 411 through a connection member 60.

Specifically, the outer peripheral edge of the filter cloth 52 is connected to the inner peripheral wall of the annular frame 51. The annular frame 51 is connected to the first flange 111 and the second flange 411 via the connection members 60, respectively. The filter cloth 52 is used to further filter dust and further prevent large particle size materials or impurities from entering the pulse bag filter 40.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. Material dust recovery unit, its characterized in that includes:

the material tank is provided with a discharging pipe in a communicating way, the top of the discharging pipe is provided with an extending pipe extending upwards, the extending pipe is provided with a through cavity communicated with the inside of the discharging pipe, and the outer end of the discharging pipe is provided with a first flange plate;

the sealing cover is detachably connected to the upper end of the extension pipe and used for sealing the through cavity;

the plate surface of the filter screen is perpendicular to the main shaft of the discharging pipe and is arranged in the discharging pipe, the filter screen extends upwards into the extending pipe, and the upper edge of the filter screen is connected with the bottom wall of the sealing cover;

the pulse type bag dust collector is arranged on one side of the material tank, a feeding pipe communicated with the discharging pipe is arranged on the side part of the pulse type bag dust collector, and a second flange plate is arranged at the outer end of the feeding pipe; and

the filtering piece is arranged between the first flange plate and the second flange plate and is connected with the first flange plate and the second flange plate through the connecting piece, and the plate surface of the filtering piece is perpendicular to the main shaft of the feeding pipe.

2. The material dust recycling apparatus according to claim 1, wherein a cleaning member for cleaning the filter screen is connected to one side edge of the filter screen, which is close to the material tank, in a vertically sliding manner.

3. The material dust recycling apparatus according to claim 2, wherein a side of the filter screen adjacent to the material tank is provided with a slide rail extending in an up-down direction, and the cleaning member comprises:

the hairbrush is connected to the sliding rail in a sliding manner along the up-down direction; and

the screw rod penetrates through the sealing cover in the vertical direction and is rotationally connected with the sealing cover, penetrates through the hairbrush in the vertical direction and is in threaded connection with the hairbrush, and the screw rod can rotate to drive the hairbrush to move up and down.

4. The material dust recycling apparatus according to claim 2, wherein a frame is provided at an outer peripheral edge of the filter screen, a collecting portion bent and extended toward a side close to the material tank for collecting the material is provided at an outer edge of the frame, and the collecting portion is provided near a lower portion of the filter screen.

5. The material dust recycling apparatus according to claim 4, wherein the collecting portion is an arc-shaped strip plate protruding downwards and attached to the inner wall of the discharge pipe, and an upwardly open collecting groove is provided in the inner peripheral wall of the arc-shaped strip plate.

6. The material dust recycling apparatus of claim 5, wherein the frame comprises:

the two vertical parts are connected to the bottom surface of the sealing cover at intervals along the radial direction of the discharging pipe and extend downwards, and the two vertical parts are respectively used for being in abutting fit with two opposite inner side walls of the extending pipe; and

the arc-shaped part, both ends are connected two respectively the lower extreme of vertical portion, and downwards arch, the diapire of arc-shaped part be used for with the interior perisporium butt cooperation of discharging pipe.

7. The material dust recycling apparatus according to claim 1, wherein a first installation groove with an outward opening is formed in an outer peripheral wall of the first flange, a second installation groove with an outward opening and arranged in one-to-one correspondence with the first installation groove is formed in an outer peripheral wall of the second flange, a third installation groove with an outward opening and arranged in one-to-one correspondence with the first installation groove is formed in an outer peripheral wall of the filter, and the first flange, the filter and the second flange are connected through the connecting piece penetrating through the first installation groove, the second installation groove and the third installation groove.

8. The material dust recycling apparatus of claim 1, wherein the connecting member comprises:

the first screw rod is connected to one side wall of the filter element, which is close to the first flange plate, and extends outwards perpendicular to the plate surface of the first flange plate, the first screw rod penetrates through the first flange plate, and a first nut is sleeved at the outer end thread of the first screw rod; and

the second screw rod is connected to the filter element, is close to one side wall of the second flange plate and is perpendicular to the plate surface of the first flange plate and extends outwards, the second screw rod penetrates through the second flange plate and is arranged, and a second nut is sleeved at the outer end of the second screw rod.

9. The material dust recycling apparatus according to claim 1, wherein the cover and the extension pipe are connected by a fixing member penetrating the cover in the up-down direction and being screw-coupled with the upper end of the extension pipe.

10. The material dust recycling apparatus according to claim 1, wherein the filter member comprises an annular frame and a filter cloth provided in the annular frame, and the annular frame is connected with the first flange plate and the second flange plate through the connecting member.

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