Flanging and punching equipment for machining engineering machinery rim center plate

Abstract

The invention relates to the technical field of rim center plate machining, and discloses flanging and punching equipment for engineering machinery rim center plate machining, which comprises two groups of supporting side plates, the supporting side plates are rectangular blocks, the upper sides of the two groups of supporting side plates are fixedly connected with a connecting top plate, and the sides, close to each other, of the two groups of supporting side plates are fixedly connected with connecting blocks; the connecting block is a U-shaped block, and the two sides of the connecting block are symmetrically and fixedly connected with two sets of extrusion springs. According to the device, inclined downward force is applied to the first extrusion block by restraining the side face of the chamfer, the mechanical rim center plate is sufficiently restrained, the automatic sliding block is moved on the fixed guide rail, the automatic sliding block drives the telescopic rod to move, and the mechanical rim center plate is extruded. The telescopic rod drives the flanging and punching machine to move so that the flanging and punching machine can be aligned with the position, needing to be punched, of the mechanical rim center plate, the mechanical rim center plate is restrained in the punching process so that the punching stability can be kept, the problem that the punching position deviates, and consequently product scrapping is caused is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of rim plate processing, and particularly to a flanging and punching device for processing engineering machinery rim plates. Background Art

[0002] Flanging refers to a forming method in which, on the flat or curved surface part of a blank, with the action of a mold, a straight wall or flange with a certain angle is formed along the closed or unclosed curve edge. Flanging is a kind of stamping process. There are many types of flanging and different classification methods. Among them, according to the deformation nature, it can be divided into elongation flanging and compression flanging. During the production process of engineering machinery rim plates, a flanging and punching device is required for processing. However, the existing flanging and punching devices have the following deficiencies. During punching processing, if the position of the rim plate is inaccurate, it is easy to cause the problem of punching position deviation, resulting in product scrapping. For this reason, we propose a flanging and punching device for processing engineering machinery rim plates. Summary of the Invention

[0003] The present invention mainly solves the technical problems existing in the above-mentioned prior art, and provides a flanging and punching device for processing engineering machinery rim plates.

[0004] To achieve the above object, the present invention adopts the following technical solution. A flanging and punching device for processing engineering machinery rim plates includes supporting side plates. The supporting side plates are rectangular blocks and there are two groups. A connecting top plate is fixedly connected to the upper sides of the two groups of supporting side plates. Connecting blocks are fixedly connected to the sides of the two groups of supporting side plates close to each other. The connecting blocks are "U"-shaped blocks. Two groups of extrusion springs are symmetrically and fixedly connected to both sides of the connecting blocks. One end of the two groups of extrusion springs far from the side surface of the connecting blocks is fixedly connected to a first extrusion block. The first extrusion block is a rectangular block. The mechanical rim plate is arranged between the two groups of first extrusion blocks. A guiding chamfer is opened at the upper edge of the side surface of the first extrusion block far from the extrusion spring, and a constraining chamfer is opened at the lower edge of the side surface of the first extrusion block far from the extrusion spring. Constraining holes are opened at the central positions of both sides of the connecting block corresponding to the guiding chamfers. The constraining holes are circular grooves. A constraining column is fixedly connected to the side surface of the guiding chamfer corresponding to the position of the constraining hole. The constraining column is a circular column and is movably installed inside the constraining hole. A first material discharging groove and a second material discharging groove are opened at the bottom side inside the connecting block. The second material discharging groove and the first material discharging groove penetrate through the upper and lower sides of the connecting block. The cross-section of the first material discharging groove is a trapezoidal groove, and the second material discharging groove is a rectangular groove. The first material discharging groove is opened above the second material discharging groove. A fixed guide rail is fixedly connected to the bottom side of the connecting top plate. An automatic slider is movably installed on the fixed guide rail. A telescopic rod is fixedly connected to the bottom side of the automatic slider. The output end of the telescopic rod is fixedly connected to a flanging and punching machine. An activity groove is opened on the side surface of the supporting side plate. The activity groove is a rectangular groove. A collection box is movably installed inside the activity groove. The collection box is a rectangular box.

[0005] Preferably, two sets of first threaded holes are symmetrically formed in the side surface of the supporting side plate corresponding to the position of the connecting block. The first threaded holes penetrate through the side surface of the connecting block. A constraint groove is formed in the side surface of the first pressing block corresponding to the position of the first threaded hole. The constraint groove is a circular groove. A first threaded rod is threadedly connected inside the first threaded hole. One end of the first threaded rod close to the constraint groove is fixedly connected with a constraint block. The constraint block is a circular device, and an arc chamfer is formed on the side of the constraint block away from the first threaded rod.

[0006] Preferably, one end of the first threaded rod away from the constraint block is fixedly connected with a first rotating block. The first rotating block is a circular column. First anti-slip grooves are equidistantly formed in a circumferential manner on the outer side of the first rotating block. The first anti-slip grooves are "C"-shaped arc grooves.

[0007] Preferably, a connecting plate is fixedly connected to the side surface of the connecting block. The cross-section of the connecting plate is an "L"-shaped block. A second threaded hole is formed in the side surface of the connecting plate corresponding to the center position of the first pressing block. A second threaded rod is threadedly connected inside the second threaded hole. One end of the second threaded rod close to the first pressing block is fixedly connected with a second pressing block. The second pressing block is a round cake shape.

[0008] Preferably, one end of the second threaded rod away from the second pressing block is fixedly connected with a second rotating block. The second rotating block is a circular column. Second anti-slip grooves are equidistantly formed in a circumferential manner on the outer side of the second rotating block. The second anti-slip grooves are "C"-shaped arc grooves.

[0009] Preferably, two sets of supporting blocks are symmetrically formed on the side surfaces of the two supporting side plates close to each other corresponding to the lower part of the collection box. The supporting blocks are rectangular blocks, and the collection box is movably installed above the two supporting blocks.

[0010] Preferably, a connecting handle is fixedly connected to the side surface of the collection box. The connecting handle is a rectangular block in the shape of a "hui" character.

[0011] Preferably, a first magnetic block is fixedly connected to the side of the collection box away from the connecting handle. The first magnetic block is a rectangular block. A second magnetic block is fixedly connected to the side surface of the supporting side plate corresponding to the position of the first magnetic block. The second magnetic block is a rectangular block.

[0012] Beneficial effects

[0013] The present invention provides a flanging and punching device for processing the rim web of construction machinery. It has the following beneficial effects:

[0014] (1) For the flanging and punching equipment for processing the rim web of construction machinery, first place the mechanical rim web vertically between two groups of first extrusion blocks. The two sides of the mechanical rim web respectively extrude the two groups of first extrusion blocks through the guiding chamfers on the first extrusion blocks. The first extrusion blocks extrude the extrusion springs to compress them. During the movement of the first extrusion blocks, the restraint columns are driven to move inside the restraint holes. When the mechanical rim web moves to the inner bottom side of the connection block, it will be restrained at the position of the restraint chamfer on the first extrusion block. There is an inclined downward force on the first extrusion block through the side of the restraint chamfer to fully restrain the mechanical rim web. Move the automatic slider on the fixed guide rail. The automatic slider drives the telescopic rod to move, and the telescopic rod drives the flanging and punching machine to move so that the flanging and punching machine aligns with the position on the mechanical rim web where punching is required. During the punching process, the mechanical rim web is restrained to maintain the stability during punching and avoid the problem of punching position deviation, thus preventing product scrapping.

[0015] (2) For the flanging and punching equipment for processing the rim web of construction machinery, perform the punching operation. The waste materials after punching fall into the interior of the collection box along the first and second material discharge grooves for collection. The collection box drives the first magnetic block and the second magnetic block to closely fit to maintain stability. During the movement, hold the connection handle by hand, and the connection handle pulls the collection box to move. The collection box moves on the support block, which is convenient to use.

[0016] (3) For the flanging and punching equipment for processing the rim web of construction machinery, rotate the first threaded rod. The first threaded rod rotates and moves inside the first threaded hole. The first threaded rod drives the restraint block to move towards the position of the first extrusion block. The restraint block is inserted into the interior of the restraint groove to make the first extrusion block closely fit the side of the mechanical rim web, further restraining the mechanical rim web and enhancing the stability of the device.

[0017] (4) For the flanging and punching equipment for processing the rim web of construction machinery, rotate the second rotating block. The second rotating block drives the second threaded rod to rotate inside the second threaded hole. The second threaded rod drives the second extrusion block to move towards one side of the mechanical rim web. The second extrusion block extrudes the mechanical rim web to adjust the position of the mechanical rim web, which is convenient to use and enhances the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0019] The structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a partial structure schematic diagram of the second extrusion block of the present invention;

[0022] Figure 3 is for the present invention Figure 2 the enlarged structure schematic diagram at A in;

[0023] Figure 4 is a partial structure schematic diagram of the first extrusion block of the present invention;

[0024] Figure 5 is for the present invention Figure 4 the enlarged structure schematic diagram at B in.

[0025] Legend description:

[0026] 1. Support side plate; 2. Connecting top plate; 3. Connecting block; 4. Extrusion spring; 5. First extrusion block; 6. Guide chamfer; 7. Constraint chamfer; 8. Constraint hole; 9. Constraint column; 10. First blanking groove; 11. Second blanking groove; 12. Fixed guide rail; 13. Automatic slider; 14. Telescopic rod; 15. Universal punching machine; 16. Activity groove; 17. Collection box; 18. First threaded hole; 19. Constraint groove; 20. First threaded rod; 21. Constraint block; 22. First rotating block; 23. First anti-slip groove; 24. Connecting plate; 25. Second threaded hole; 26. Second threaded rod; 27. Second extrusion block; 28. Second rotating block; 29. Second anti-slip groove; 30. Support block; 31. Connecting handle; 32. First magnet; 33. Second magnet. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Example: A flanging and punching device for processing the rim web of construction machinery, as Figures 1-5As shown in the figure, it includes supporting side plates 1. The supporting side plates 1 are rectangular blocks and there are two groups. A connecting top plate 2 is fixedly connected to the upper sides of the two groups of supporting side plates 1. Connecting blocks 3 are fixedly connected to the sides of the two groups of supporting side plates 1 that are close to each other. The connecting blocks 3 are "U"-shaped blocks. Two groups of compression springs 4 are symmetrically and fixedly connected to both sides of the connecting blocks 3. One end of the two groups of compression springs 4 away from the side of the connecting block 3 is fixedly connected to a first extrusion block 5. The first extrusion block 5 is a rectangular block. The mechanical wheel rim web is arranged between the two first extrusion blocks 5. A guiding chamfer 6 is opened at the upper edge of the side of the first extrusion block 5 away from the compression spring 4. A restraining chamfer 7 is opened at the lower edge of the side of the first extrusion block 5 away from the compression spring 4. Constraining holes 8 are opened at the central positions of both sides of the connecting block 3 corresponding to the guiding chamfer 6. The constraining holes 8 are circular grooves. A constraining column 9 is fixedly connected to the side of the guiding chamfer 6 corresponding to the position of the constraining hole 8. The constraining column 9 is a circular column and is movably installed inside the constraining hole 8. A first material discharging groove 10 and a second material discharging groove 11 are opened at the inner bottom side of the connecting block 3. The second material discharging groove 11 and the first material discharging groove 10 penetrate through the upper and lower sides of the connecting block 3. The cross-section of the first material discharging groove 10 is a trapezoidal groove, and the second material discharging groove 11 is a rectangular groove. The first material discharging groove 10 is opened above the second material discharging groove 11. A fixed guide rail 12 is fixedly connected to the bottom side of the connecting top plate 2. An automatic slider 13 is movably installed on the fixed guide rail 12. A telescopic rod 14 is fixedly connected to the bottom side of the automatic slider 13. The output end of the telescopic rod 14 is fixedly connected to a side-turning punching machine 15. An activity groove 16 is opened on the side of the supporting side plate 1. The activity groove 16 is a rectangular groove. A collecting box 17 is movably installed inside the activity groove 16. The collecting box 17 is a rectangular box. First, place the mechanical wheel rim web between the two first extrusion blocks 5 from top to bottom. The two sides of the mechanical wheel rim web respectively extrude the two first extrusion blocks 5 through the guiding chamfer 6 on the first extrusion blocks 5. The first extrusion block 5 extrudes the compression spring 4 to compress the compression spring 4. During the movement of the first extrusion block 5, the constraining column 9 is driven to move inside the constraining hole 8. When the mechanical wheel rim web moves to the inner bottom side of the connecting block 3, it will be constrained at the position of the restraining chamfer 7 on the first extrusion block 5. There is an inclined downward force on the first extrusion block 5 through the side of the restraining chamfer 7 to fully constrain the mechanical wheel rim web. Move the automatic slider 13 on the fixed guide rail 12. The automatic slider 13 drives the telescopic rod 14 to move. The telescopic rod 14 drives the side-turning punching machine 15 to move so that the side-turning punching machine 15 is aligned with the position on the mechanical wheel rim web that needs to be punched. During the punching process, the mechanical wheel rim web is constrained to maintain the stability during punching. Two groups of first threaded holes 18 are symmetrically opened on the side of the supporting side plate 1 corresponding to the position of the connecting block 3. The first threaded holes 18 penetrate through the side of the connecting block 3. A constraining groove 19 is opened on the side of the first extrusion block 5 corresponding to the position of the first threaded hole 18. The constraining groove 19 is a circular groove. A first threaded rod 20 is threadedly connected inside the first threaded hole 18. One end of the first threaded rod 20 close to the constraining groove 19 is fixedly connected to a constraining block 21.The constraint block 21 is a circular device. An arc chamfer is provided on the side of the constraint block 21 away from the first threaded rod 20. One end of the first threaded rod 20 away from the constraint block 21 is fixedly connected to a first rotating block 22. The first rotating block 22 is a circular column. First anti-slip grooves 23 are equidistantly and circumferentially provided on the outer side of the first rotating block 22. The first anti-slip grooves 23 are "C"-shaped arc grooves. Rotate the first threaded rod 20, and the first threaded rod 20 rotates and moves inside the first threaded hole 18. The first threaded rod 20 drives the constraint block 21 to move towards the position of the first pressing block 5. The constraint block 21 is inserted into the constraint groove 19 to make the first pressing block 5 closely fit the side surface of the mechanical wheel rim web, further constraining the mechanical wheel rim web. A connecting plate 24 is fixedly connected to the side surface of the connecting block 3. The cross-section of the connecting plate 24 is an "L"-shaped block. A second threaded hole 25 is provided at the center position of the connecting plate 24 corresponding to the first pressing block 5. A second threaded rod 26 is threadedly connected inside the second threaded hole 25. One side of the second threaded rod 26 close to the first pressing block 5 is fixedly connected to a second pressing block 27. The second pressing block 27 is a round cake shape. One end of the second threaded rod 26 away from the second pressing block 27 is fixedly connected to a second rotating block 28. The second rotating block 28 is a circular column. Second anti-slip grooves 29 are equidistantly and circumferentially provided on the outer side of the second rotating block 28. The second anti-slip grooves 29 are "C"-shaped arc grooves. Rotate the second rotating block 28, and the second rotating block 28 drives the second threaded rod 26 to rotate inside the second threaded hole 25. The second threaded rod 26 drives the second pressing block 27 to move towards one side of the mechanical wheel rim web. The second pressing block 27 presses the mechanical wheel rim web to adjust the position of the mechanical wheel rim web. On the side surfaces of the two support side plates 1 close to each other, two support blocks 30 are symmetrically provided below the collection box 17. The support blocks 30 are rectangular blocks. The collection box 17 is movably installed above the two support blocks 30. A connecting handle 31 is fixedly connected to the side surface of the collection box 17. The connecting handle 31 is a rectangular block in the shape of a "return" character. A first magnetic block 32 is fixedly connected to the side of the collection box 17 away from the connecting handle 31. The first magnetic block 32 is a rectangular block. A second magnetic block 33 is fixedly connected to the side surface of the support side plate 1 corresponding to the first magnetic block 32. The second magnetic block 33 is a rectangular block. Drilling operations are carried out. The waste materials after drilling fall into the collection box 17 through the first material discharge groove 10 and the second material discharge groove 11 for collection. The collection box 17 drives the first magnetic block 32 to closely fit the second magnetic block 33 to maintain stability. During the movement, hold the connecting handle 31 by hand, and the connecting handle 31 pulls the collection box 17 to move. The collection box 17 moves on the support blocks 30.,

[0029] Accordingly, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0030] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0033] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly under and obliquely under the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

Claims

1. A flanging and punching device for processing the rim web of construction machinery, comprising support side plates (1), the support side plates (1) being rectangular blocks and there being two groups, a connecting top plate (2) being fixedly connected to the upper sides of the two groups of support side plates (1), a connecting block (3) being fixedly connected to one side of the two groups of support side plates (1) close to each other, the connecting block (3) being a "U"-shaped block, and characterized in that: On both sides of the said connecting block (3), two groups of extrusion springs (4) are symmetrically and fixedly connected. One end of the two groups of extrusion springs (4) far from the side of the connecting block (3) is fixedly connected with a first extrusion block (5). The first extrusion block (5) is a rectangular block. The mechanical wheel rim web is arranged between the two first extrusion blocks (5). On the edge of the side of the first extrusion block (5) far from the extrusion spring (4), a guiding chamfer (6) is provided. On the lower edge of the side of the first extrusion block (5) far from the extrusion spring (4), a restraining chamfer (7) is provided. At the center position corresponding to the guiding chamfer (6) on both sides of the connecting block (3), restraining holes (8) are provided. The restraining holes (8) are circular grooves. At the position of the guiding chamfer (6) corresponding to the restraining holes (8), a restraining column (9) is fixedly connected. The restraining column (9) is circular cylindrical and is movably installed inside the restraining hole (8). At the inner bottom side of the connecting block (3), a first blanking groove (10) and a second blanking groove (11) are provided. The second blanking groove (11) and the first blanking groove (10) penetrate through the upper and lower sides of the connecting block (3). The cross-section of the first blanking groove (10) is a trapezoidal groove, and the second blanking groove (11) is a rectangular groove. The first blanking groove (10) is provided above the second blanking groove (11). At the bottom side of the connecting top plate (2), a fixed guide rail (12) is fixedly connected. An automatic slider (13) is movably installed on the fixed guide rail (12). At the bottom side of the automatic slider (13), a telescopic rod (14) is fixedly connected. The output end of the telescopic rod (14) is fixedly connected with a side punching machine (15). On the side of the supporting side plate (1), an activity groove (16) is provided. The activity groove (16) is a rectangular groove. Inside the activity groove (16), a collection box (17) is movably installed. The collection box (17) is a rectangular box.

2. The flanging and punching equipment for processing the rim web of construction machinery according to claim 1, wherein: On the side of the said supporting side plate (1) corresponding to the position of the connecting block (3), two groups of first threaded holes (18) are symmetrically provided. The first threaded holes (18) penetrate through the side of the connecting block (3). At the position of the first threaded holes (18) corresponding to the side of the first extrusion block (5), a restraining groove (19) is provided. The restraining groove (19) is a circular groove. Inside the first threaded hole (18), a first threaded rod (20) is threadedly connected. One end of the first threaded rod (20) close to the restraining groove (19) is fixedly connected with a restraining block (21). The restraining block (21) is a circular device. On the side of the restraining block (21) far from the first threaded rod (20), an arc chamfer is provided.

3. The flanging and punching equipment for processing the rim web of construction machinery according to claim 2, wherein: One end of the said first threaded rod (20) far from the restraining block (21) is fixedly connected with a first rotating block (22). The first rotating block (22) is circular cylindrical. On the outer side of the first rotating block (22), a first anti-slip groove (23) is equidistantly and circumferentially provided. The first anti-slip groove (23) is a "C"-shaped arc groove.

4. The flanging and punching equipment for processing the rim web of construction machinery according to claim 1, characterized in that: A connecting plate (24) is fixedly connected to the side surface of the connecting block (3). The cross-section of the connecting plate (24) is an "L"-shaped block. A second threaded hole (25) is opened at the center position of the connecting plate (24) corresponding to the first extrusion block (5). A second threaded rod (26) is threadedly connected inside the second threaded hole (25). A second extrusion block (27) is fixedly connected to the side of the second threaded rod (26) close to the first extrusion block (5). The second extrusion block (27) is in the shape of a round cake.

5. The flanging and punching device for processing the rim web of construction machinery according to claim 4, wherein: A second rotating block (28) is fixedly connected to the end of the second threaded rod (26) away from the second extrusion block (27). The second rotating block (28) is in the shape of a circular column. Second anti-slip grooves (29) are equidistantly and circumferentially opened on the outer side of the second rotating block (28). The second anti-slip grooves (29) are "C"-shaped arc grooves.

6. The flanging and punching equipment for processing the rim web of construction machinery according to claim 1, wherein: Two sets of support blocks (30) are symmetrically opened on the side surfaces of the two sets of support side plates (1) close to each other and below the collection box (17). The support blocks (30) are rectangular blocks. The collection box (17) is movably installed above the two sets of support blocks (30).

7. The flanging and punching equipment for processing the rim web of construction machinery according to claim 6, characterized in that: A connecting handle (31) is fixedly connected to the side surface of the collection box (17). The connecting handle (31) is a rectangular block in the shape of a "return" character.

8. The flanging and punching device for processing the rim web of construction machinery according to claim 7, characterized in that: A first magnet (32) is fixedly connected to the side of the collection box (17) away from the connecting handle (31). The first magnet (32) is in the shape of a rectangular block. A second magnet (33) is fixedly connected to the side surface of the support side plate (1) corresponding to the position of the first magnet (32). The second magnet (33) is in the shape of a rectangular block.

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