Immersion type cotton dust filtering device

Abstract

The utility model relates to an immersion type cotton dust filtering device. The immersion type cotton dust filtering device comprises a filtering barrel, a bracket and a rotary driving piece, the filter barrel comprises a filter barrel body, two ends of the filter barrel body are respectively provided with a water inlet part and a water outlet part, the water inlet part is provided with a water inlet so that the inner diameter of the water inlet is smaller than the inner diameter of the filter barrel body, and the water outlet part is provided with a water outlet so that the inner diameter of the water outlet is smaller than the inner diameter of the filter barrel body; the filter barrel body between the water inlet part and the water outlet part is a barrel body filter screen part provided with filter holes; the support is rotationally connected with the filter barrel body, and the rotary driving piece is in driving connection with the filter barrel body. The device can be immersed in a water pool for use, and is not or less influenced by the height limitation of a use site; an additional water pump is not needed, so that the cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field, and in particular to an immersion-type cotton dust filtration device. Background Technology

[0002] CN210186665U discloses a cotton dust collection and recycling water device, which includes at least a filter tank, a filter barrel assembly, and two power components. The filter tank includes an outer wall and a support frame with two hinge holes, and the outer wall is mounted on the support frame. The outer walls together form the inner cavity of the filter tank. The power components include a power device, a central rod, and a disassembly block that are fixedly connected in sequence. The disassembly block is provided with a disassembly groove, and the side and one end of the disassembly groove are connected to the outside. The power components also include a disassembly sleeve fitted on the disassembly block. The disassembly sleeve is provided with disassembly protrusions extending inward. The filter barrel assembly includes a filter barrel body, two end pieces, and a roller central rod. The filter barrel body is fixedly connected to the roller central rod. The filter barrel body is provided with filter holes. The end pieces are fixedly provided with disassembly columns. The central rod passes through the hinge holes respectively, the disassembly protrusions are embedded in the disassembly grooves, and the disassembly columns are inserted into the space formed by the disassembly protrusions and the disassembly grooves, so that the disassembly columns are fixed around the axis of the central rod.

[0003] The cotton dust collection and water recycling device disclosed in CN210186665U requires the use of an additional water pump, necessitating the installation of an additional liquid extraction device 42 and extraction pipe 421 to pump wastewater into the filter assembly, resulting in higher equipment costs. Furthermore, the cotton dust collection and water recycling device disclosed in CN210186665U must be placed outside the wastewater tank for use, placing certain requirements on the site. For example, it cannot be used on water tanks with height restrictions due to shelters or other structures. Summary of the Invention

[0004] One objective of this invention is to solve or alleviate the aforementioned technical problems.

[0005] The present invention employs an immersion-type cotton dust filtration device, comprising a filter barrel, a support frame, and a rotary drive component. The filter barrel includes a filter barrel body, with an inlet and an outlet at each end. The inlet is provided with an inlet such that its inner diameter is smaller than the inner diameter of the filter barrel body, and the outlet is provided with an outlet such that its inner diameter is smaller than the inner diameter of the filter barrel body. The filter barrel body between the inlet and outlet portions is a filter screen portion with filter holes. The support frame is rotatably connected to the filter barrel body, and the rotary drive component is motive-connected to the filter barrel body.

[0006] This invention can be used in a water tank and is not affected by the height restrictions of the site of use; it also does not require an additional water pump, which helps to reduce costs.

[0007] A further technical solution includes a flow guide fixed to the inner wall of the filter barrel. The flow guide includes a flow guide section, which causes the water in the filter barrel to flow from the inlet to the outlet as the filter barrel rotates.

[0008] This allows cotton dust to accumulate near the water outlet, reducing the need for or minimizing the need to clean the cotton dust in the middle of the filter canister with tools such as brooms, making it easier to clean the cotton dust.

[0009] In a further technical solution, the diameter of the outlet gradually decreases from the inlet to the outlet, and the outlet is located at the end of the outlet. The guide also includes a filter screen segment with filter holes, and the filter screen segment has a portion located within the outlet in a horizontal direction.

[0010] It allows cotton dust to accumulate at the water outlet and remain there, making it easy to clean the cotton dust.

[0011] A further technical solution is that the flow guide is flat and inclined relative to the axis of the filter barrel; or, the flow guide is spiral.

[0012] This facilitates the production of the flow guide components and their installation inside the filter housing.

[0013] A further technical solution is that the filter body includes a water inlet section, the diameter of which gradually decreases from the water outlet to the water inlet, and the water inlet is located at the head end.

[0014] It can improve the filtration effect of cotton dust water output from the cotton dust water pipe.

[0015] A further technical solution involves a support wheel in one of the brackets and the filter housing, and a circular support wheel rim in the other, with the support wheel rim abutting against the support wheel.

[0016] A further technical solution involves a circular driving edge on the filter barrel, a motor-driven driving wheel as the rotating driving component, and support wheels located below the filter barrel. The driving wheel contacts the driving edge and can drive the driving edge, while the driving wheel is located above the filter barrel.

[0017] The drive wheels and motor can be positioned above the surface of sewage or other water sources, eliminating the need for immersion protection and reducing costs.

[0018] In a further technical solution, the bracket includes an upper extension frame, and the drive wheel is hinged to the upper extension frame.

[0019] A further technical solution is that the filter barrel is provided with an annular support wheel rim, the support wheel is provided with a support wheel limiting edge, and the support wheel limiting edge is located in the direction in which the support wheel rim moves along the axis of the filter barrel.

[0020] It can prevent the filter barrel from moving along its axis and detaching from the support wheels.

[0021] In a further technical solution, the drive wheel is located directly above the filter barrel, and there are two sets of support wheels; one set of support wheels abuts against the rim of the support wheel, and each support wheel corresponding to the rim of the support wheel is provided with two rings of support wheel limiting edges to form a support wheel groove, and the rim of the support wheel is located in the support wheel groove; the other set of support wheels abuts against the drive edge, and the support wheel corresponding to the drive edge is provided with one ring of support wheel limiting edges; the ring of support wheel limiting edges restricts the movement of the filter barrel in the direction from the support wheel rim to the drive edge.

[0022] The filter can be disassembled and installed without removing the drive wheel, which is convenient, especially for cleaning the cotton dust inside the filter can. Attached Figure Description

[0023] Figure 1 This is a perspective view of an immersion-type cotton dust filter device according to an embodiment of the present invention. Figure 1 .

[0024] Figure 2 This is a perspective view of an immersion-type cotton dust filter device according to an embodiment of the present invention. Figure 2 .

[0025] Figure 3 This is a front view schematic diagram of an immersion cotton dust filter device according to an embodiment of the present invention.

[0026] Figure 4 This is a cross-sectional schematic diagram of an immersion-type cotton dust filter device according to an embodiment of the present invention; the cross-section is the plane where the flow guide 12 is located.

[0027] Figure 5 This is a top view schematic diagram of an immersion cotton dust filtration device according to an embodiment of the present invention.

[0028] Figure 6 This is a schematic diagram of section SEC1; arrow ARR1 indicates the rotation direction of filter barrel 1.

[0029] Figure 7 This is a schematic diagram of section SEC2; arrow 2 ARR2 indicates the approximate flow direction and path of the cotton dust and water; arrow 3 ARR3 indicates one of the directions in which water in filter barrel 1 can flow through the filter holes of the filter screen part 113 of the barrel and out of filter barrel 1; arrow 4 ARR4 indicates the trend direction of the water and cotton dust in filter barrel 1 being pushed by the guide member 12; line 1 indicates the water level line in the water tank 9.

[0030] Figure 8This is a simplified diagram illustrating the principle of the immersion-type cotton dust filtration device in use according to an embodiment of this utility model; arrow 2 ARR2 indicates the approximate flow direction and path of the cotton dust water in the cotton dust water pipe 91; arrow 5 ARR5 indicates the approximate flow direction and path of the water in the water tank 9 being pumped back to the cotton dust chamber 99 through the water pumping pipe 92.

[0031] The attached drawings in the specification are specified. Figure 7 The attached figure is for the abstract.

[0032] Section 1 (SEC1); Section 2 (SEC2); Line 1 (LINE1); Arrow 1 (ARR1); Arrow 2 (ARR2); Arrow 3 (ARR3); Arrow 4 (ARR4); Arrow 5 (ARR5); Filter barrel 1; Filter barrel body 11; Inlet 111; Inlet section 112; Barrel body filter screen section 113; Extension edge 117; Outlet section 118; Outlet 119; Flow guide 12; Flow guide section 121; Filter screen section 122; Reinforcing rod 129; Drive edge 13; Support wheel edge 14; Height distance 19; Bracket 2; Upper extension frame 23; Support wheel 24; Support wheel limiting edge 241; Support wheel groove 242; Rotary drive component 3; Water tank 9; Cotton dust water pipe 91; Pumping pipe 92; Pumping pump 921; Cotton dust chamber 99. Detailed Implementation

[0033] The specific embodiments of this utility model will now be described with reference to the accompanying drawings.

[0034] As a specific embodiment, the immersion cotton dust filtration device of this utility model includes a filter barrel 1, a support 2, and a rotary drive component 3.

[0035] The filter canister 1 includes a filter canister body 11. The filter canister body 11 has an inlet 112 and an outlet 118 at both ends. The inlet 112 has an inlet 111, the inner diameter of which is smaller than the inner diameter of the filter canister body 11. The outlet 118 has an outlet 119, the inner diameter of which is smaller than the inner diameter of the filter canister body 11. Figure 7 As shown, because the inner diameter of the inlet 111 is smaller than the inner diameter of the filter barrel 11, when the immersion-type cotton dust filter of this embodiment is placed in the water tank, the lowest point of the inlet 111 is higher than the water level line in the water tank 9 (as shown by line LINE1), resulting in a height difference of 19. However, the bottom part of the filter screen section 113 of the barrel, described later, is lower than the water level line in the water tank 9 and is immersed in the water in the water tank 9. It is easy to understand that the lowest point of the outlet 119 is also higher than the water level line in the water tank 9.

[0036] The filter housing 11 between the inlet 112 and the outlet 118 is provided with filter holes (e.g. Figure 1 , 2The barrel filter section 113 (shown as dotted filling) has small filter holes that allow only water to pass through but not cotton dust, thus enabling the filtration of cotton dust water (i.e., water containing cotton dust, which can be understood as wastewater to be treated). It is also easy to understand that neither the inlet section 112 nor the outlet section 118 has filter holes and therefore does not allow water to pass through them.

[0037] The bracket 2 is rotatably connected to the filter housing 11, and the rotary drive 3 is driven to connect to the filter housing 11, allowing the filter housing 11 to rotate on the bracket 2. For example, one of the bracket 2 and the filter housing 11 may be provided with a support wheel 24, and the other with an annular support rim 14. The support rim 14 abuts against the support wheel 24, thereby rotatably connecting the bracket 2 and the filter housing 11. It is easy to understand that in the embodiment where the filter housing 11 is provided with a support wheel 24 and the bracket 2 is provided with an annular support rim 14 (not shown in the attached drawings of this embodiment), the annular support rim 14 is fixed to the bracket 2, and both the filter housing 11 and the support wheel 24 are located within the support rim 14.

[0038] The working principle is as follows: Figure 8 As shown, the cotton dust chamber 99 transports cotton dust water to the water tank 9 via the cotton dust water pipe 91. It should be noted that the water pressure within the cotton dust water pipe 91 is generated by the conveying force produced by a water pump or other water transport device within the cotton dust chamber 99, or by the gravitational potential energy of the cotton dust chamber 99 above the water tank; for example... Figure 7 As shown, the outlet of the cotton dust water pipe 91 extends into the filter barrel 11 from the water inlet 111, so cotton dust water can be transported from the outlet of the cotton dust water pipe 91 into the filter barrel 11, thus eliminating the need for additional water pumps or the like.

[0039] Before use, immerse the support 2 and filter bucket 1 in the sewage tank (not shown in the attached diagram), ensuring that the water level in the tank 9 is higher than the lowest point of the filter screen 113 and the bottom of the filter screen 113 is submerged in the water. Simultaneously, the water level in the tank 9 should be lower than the lowest point of the inlet 111 and higher than the lowest point of the outlet 119. It is easy to understand that the height of the support 2 can be adjusted using existing technology. For example, a screw (not shown in the attached diagram) can be installed at the bottom of the support 2, and rotating the screw can adjust the height of the support 2. This allows adjustment of the height of the filter bucket 1 to achieve the aforementioned height setting. Of course, adjusting the water level in the tank 9 using existing technology is also one way to achieve the aforementioned height setting of the filter bucket 1. It is easy to understand that since the support 2 and filter bucket 1 are placed in the tank 9, their height above the ground is the total height of the support 2 and filter bucket 1 minus the depth of the tank 9. Their height below or above the ground is relatively low, and they are not significantly affected by the height restrictions of the usage site.

[0040] like Figure 7 As shown, during use, the rotation drive 3 is activated to rotate the filter barrel 1. Cotton dust water enters the filter barrel 11 from the outlet of the cotton dust water pipe 91. A portion of the water in the cotton dust water flows out of the filter barrel 11 through the filter holes of the filter screen section 113, while the cotton dust in the water cannot pass through the filter holes of the filter screen section 113 and remains inside the filter barrel 11. As the filter barrel 1 rotates, the cotton dust gradually accumulates on one side of the inner wall of the filter screen section 113 (the inner wall of the filter screen section 113 is the inner wall that rotates from below the water level line of the pool 9 towards the top of the pool 9). This process is repeated, allowing the cotton dust in the cotton dust water to remain inside the filter barrel 11, while the water in the cotton dust water flows into the pool 9, thus filtering the cotton dust water output from the cotton dust water pipe 91.

[0041] Normally, dust and other particles accumulated on the filter screen 113 remain inside the filter housing 11 and require regular cleaning to prevent them from crossing the inlet 111 and / or outlet 119 and entering the water tank 9, thus contaminating the water in the tank 9. Typically, such as Figure 8 As shown, the water in the pool 9 is transported back to the dust chamber 99 through the pumping pipe 92 and the pumping pump 921 (which may be the pumping pump 921 included in the spraying machine) for use in the dust chamber 99 again.

[0042] As can be seen from the above, the immersion-type cotton dust filter of this utility model can be used in a water tank 9 without being significantly affected by the height restrictions of the usage site; it also eliminates the need for an additional water pump, which helps reduce costs. It should be noted that although the immersion-type cotton dust filter of this utility model is mainly applicable to the scenario of immersion in a sewage tank 9, it is not limited to the use of immersion in a water tank 9; for example, the bracket 2 can be placed above the water tank 9 for use.

[0043] As one specific implementation, the filter barrel 1 further includes a flow guide 12 fixed to the inner wall of the filter barrel body 11. The flow guide 12 includes a flow guide section 121, which, as the filter barrel 1 rotates, causes the water inside the filter barrel body 11 to flow with the inlet 111 pointing towards the outlet 119. Figure 6 As shown, the inlet 111 is located on the inner side perpendicular to the paper surface. The guide section 121 rotates counterclockwise (as indicated by arrow ARR1), causing the water in the filter tank 11 to tend to flow outward perpendicular to the paper surface. It is easy to understand that this tendency to flow outward perpendicular to the paper surface is... Figure 7 The direction indicated by the middle arrow ARR4. (As shown) Figure 7 As shown, the water and cotton dust in the filter canister 1 are pushed towards the outlet 119 by the guide component 12, which eventually causes the cotton dust to gather near the outlet 119. When cleaning the cotton dust regularly, it is less necessary to use tools such as brooms to clean the cotton dust in the middle (horizontal middle) of the filter canister 11, making it easier to clean the cotton dust.

[0044] As one specific implementation, the diameter of the outlet portion 118 gradually decreases from the inlet 111 to the outlet 119, and the outlet 119 is located at the end of the outlet portion 118; the guide member 12 also includes filter holes (such as... Figure 4 The filter screen segment 122 (shown as dotted filling) has a portion horizontally located within the outlet portion 118. It is easy to understand that there is no substantial difference between the filter holes of the filter screen segment 122 and the filter holes of the filter screen portion 113 of the filter body; therefore, the description of the filter holes of the filter screen segment 122 will not be repeated here. Water and cotton dust inside the filter tank 1 are pushed towards the outlet 119 by the guide member 12. At the outlet portion 118, the filter screen segment 122 pushes the cotton dust and water towards the inner wall of the outlet portion 118. After being separated by the filter screen segment 122, the cotton dust remains at the outlet portion 118, allowing it to accumulate and be retained, facilitating cleaning.

[0045] As one of the specific implementation methods, such as Figure 7 As shown, the flow guide 12 is generally flat (a plate-like structure on a plane) and is inclined relative to the axis of the filter barrel 1; or, the flow guide 12 is generally spiral-shaped (not shown in the accompanying drawings of this embodiment). This facilitates the production of the flow guide 12 and its installation into the filter barrel 11. After the flow guide 12 is fixed inside the filter barrel 11, its strength is maintained by the reinforcing rod 129.

[0046] As one specific implementation, the filter housing 11 includes a water inlet 112. The diameter of the water inlet 112 gradually decreases from the water outlet 119 towards the water inlet 111, and the water inlet 111 is located at the head end. The cotton dust water output from the cotton dust water pipe 91 splashes when it hits the water in the water tank 9 after free fall. The water inlet 112 can guide the splashed cotton dust water back into the filter housing 11, thereby improving the filtration effect of the cotton dust water output from the cotton dust water pipe 91.

[0047] As one specific implementation, the filter housing 11 is provided with an annular driving edge 13. The rotating driving component 3 is a motor-driven driving wheel, and the support wheels 24 are all located below the filter housing 11 (below the horizontal plane passing through the axis of the filter housing 11). The driving wheel contacts the driving edge 13 and can drive the driving edge 13. The driving wheel is located above the filter housing 11. For example, the driving wheel is a sprocket, and the driving edge 13 is a chain fixed to the filter housing 11; for example, the driving wheel is a gear, and the driving edge 13 is a rack fixed to the filter housing 11. Of course, the driving wheel can also drive the driving edge 13 by friction. The driving wheel and motor can be above the surface of the sewage, etc., eliminating the need for anti-immersion treatment and reducing costs.

[0048] As one specific implementation, the support 2 includes an upper extension frame 23, on which the drive wheel is hinged, such that the drive wheel is positioned above the filter barrel 11. For example, there are two support wheels 24, and the three wheels (two support wheels 24 and the drive wheel) have an included angle of approximately 120 degrees between any two wheels, so that the three wheels are evenly distributed around the axis of the filter barrel 11; and the drive wheel is positioned directly above the filter barrel 11 to ensure that the filter barrel 1 is relatively stable on the support 2.

[0049] As one specific implementation, the filter barrel 11 is provided with an annular support rim 14, and the support wheel 24 is provided with a support wheel limiting rim 241, which is located in the direction of movement of the support rim 14 along the axis of the filter barrel 11. This can prevent the filter barrel 11 from moving along its axis and disengaging from the support wheel 24.

[0050] In one specific implementation, the drive wheel is located directly above the filter barrel 11, and there are two sets of support wheels 24. One set of support wheels 24 abuts against the support wheel rim 14, and each support wheel 24 corresponding to the support wheel rim 14 is provided with two rings of support wheel limiting edges 241 to form a support wheel groove 242, with the support wheel rim 14 located within the support wheel groove 242. The other set of support wheels 24 abuts against the drive edge 13, and the support wheel 24 corresponding to the drive edge 13 is provided with one ring of support wheel limiting edges 241 (support wheels 24 with only one ring of support wheel limiting edges 241 are not shown in the attached drawings). This ring of support wheel limiting edges 241 restricts the movement of the filter barrel 11 along the direction from the support wheel rim 14 to the drive edge 13. For example, Figure 5 As shown, the support wheel 24 corresponding to the drive edge 13 has a support wheel limiting edge 241 only on the left side of the drive edge 13; while the support wheel 24 corresponding to the support wheel edge 14 has support wheel limiting edges 241 on both the left and right sides of the support wheel edge 14. When one end of the filter barrel 11 is lifted, causing the support wheel edge 14 to move out of the support wheel groove 242, the other end of the filter barrel 11 remains along the axis of the filter barrel 11 due to the resistance of the support wheel limiting edges 241 of the support wheel 24 corresponding to the drive edge 13, and the drive wheel separates from the drive edge 13; in other words, as... Figure 5 As shown, the filter canister 1 is roughly centered on the support wheel limiting edge 241 of the support wheel 24 corresponding to the drive edge 13. The other end of the filter canister 11 rotates and lifts, then the filter canister 11 is pulled away from the support wheel limiting edge 241 of the support wheel 24 corresponding to the drive edge 13 (i.e., to the right), thus detaching the filter canister 1 from the bracket 2. The reverse process allows the filter canister 1 to be installed onto the bracket 2. As can be seen from the above, the filter canister 1 can be disassembled and installed without removing the drive wheel, which is convenient, especially for cleaning dust and other debris inside the filter canister 1.

[0051] The terms used in this invention, such as "first," "second," etc., do not indicate any order, quantity, or importance, but are merely for distinction.

[0052] In this invention, terms such as "a" or "an" are used to indicate not a limitation on the quantity, but rather to indicate the existence of at least one of the mentioned objects.

[0053] In this utility model, terms indicating direction or location such as top, bottom, side, longitudinal, transverse, middle, center, outside, inside, horizontal, vertical, left, right, above, and below are used to indicate relative positions rather than absolute positions.

[0054] Terms used in this invention, such as "approximately," "generally," "approximately," and "similar," are limiting terms used to indicate features that are present but allow for certain deviations. The amount of deviation allowed may vary depending on the specific context; for example, regarding dimensional deviations, the specific context may include, but is not limited to, relevant standards for dimensional tolerances.

Claims

1. An immersion-type cotton dust filtration device, comprising a filter barrel (1), a support (2), and a rotary drive component (3); Its characteristics are, The filter barrel (1) includes a filter barrel body (11), with an inlet (112) and an outlet (118) respectively provided at both ends of the filter barrel body (11). The inlet (112) is provided with an inlet (111) such that the inner diameter of the inlet (111) is smaller than the inner diameter of the filter barrel body (11), and the outlet (118) is provided with an outlet (119) such that the inner diameter of the outlet (119) is smaller than the inner diameter of the filter barrel body (11). The flow between the inlet (112) and the outlet (118) is... The filter barrel (11) is a barrel filter screen part (113) with filter holes; the bracket (2) is rotatably connected to the filter barrel (11), and the rotation drive (3) is drivenly connected to the filter barrel (11); the filter barrel (1) also includes a flow guide (12) fixed to the inner wall of the filter barrel (11), the flow guide (12) includes a flow guide section (121), the flow guide section (121) rotates with the filter barrel (1) and makes the water in the filter barrel (11) have a flow tendency from the inlet (111) to the outlet (119).

2. The immersion-type cotton dust filter device according to claim 1, characterized in that the water outlet... The diameter of the part (118) gradually decreases from the inlet (111) to the outlet (119), and the outlet (119) is located at the end of the outlet part (118); the guide member (12) also includes a filter screen section (122) with filter holes, and the filter screen section (122) has a portion located within the outlet part (118) in the horizontal direction.

3. The immersion-type cotton dust filter device according to claim 2, characterized in that, The guide member (12) is flat and inclined relative to the axis of the filter barrel (1); or the guide member (12) is spiral.

4. The immersion-type cotton dust filter device according to claim 1, characterized in that, The filter barrel (11) includes an inlet section (112), the diameter of which gradually decreases from the outlet (119) to the inlet (111), and the inlet (111) is located at the head end.

5. The immersion-type cotton dust filter device according to claim 1, characterized in that, One of the bracket (2) and the filter barrel (11) is provided with a support wheel (24), and the other is provided with a circular support wheel rim (14), with the support wheel rim (14) abutting against the support wheel (24).

6. The immersion-type cotton dust filter device according to claim 5, characterized in that, The filter barrel (11) is provided with an annular driving edge (13), the rotating driving component (3) is a motor-driven driving wheel, and the support wheels (24) are all located below the filter barrel (11). The driving wheel contacts the driving edge (13) and can drive the driving edge (13). The driving wheel is located above the filter barrel (11).

7. The immersion-type cotton dust filter device according to claim 6, characterized in that, The bracket (2) includes an upper extension frame (23), on which the drive wheel is hinged.

8. The immersion-type cotton dust filter device according to claim 5, characterized in that, The filter barrel (11) is provided with an annular support wheel rim (14), and the support wheel (24) is provided with a support wheel limiting rim (241). The support wheel limiting rim (241) is located in the direction of movement of the support wheel rim (14) along the axis of the filter barrel (11).

9. The immersion-type cotton dust filter according to claim 6 or 7, characterized in that, The drive wheel is located directly above the filter barrel (11), and there are two sets of support wheels (24). One set of the two sets of support wheels (24) abuts against the support wheel rim (14), and the support wheel (24) corresponding to the support wheel rim (14) is provided with two rings of support wheel limiting rims (241) to form a support wheel groove (242), and the support wheel rim (14) is located in the support wheel groove (242). The other set of the two sets of support wheels (24) abuts against the drive rim (13), and the support wheel (24) corresponding to the drive rim (13) is provided with a ring of support wheel limiting rims (241). The ring of support wheel limiting rims (241) restricts the filter barrel (11) from moving in the direction from the support wheel rim (14) to the drive rim (13).

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