Novel chemical tank cleaning device

Abstract

The utility model discloses a novel chemical tank cleaning device which comprises a horizontally-placed circular plate, a tank opening center circular block fixedly connected to the center of the bottom face of the horizontally-placed circular plate, a telescopic square cylinder fixedly connected to one side of the tank opening center circular block, a telescopic square column connected to the interior of the telescopic square cylinder in a telescopic mode, and a column pushing spring arranged between the telescopic square column and the telescopic square cylinder. A telescopic column is fixedly connected to one end of the top face of the telescopic square column, a movable groove is formed in the position, corresponding to the telescopic column, of the top face of the telescopic square cylinder, and a telescopic ring is arranged on the top face of the horizontally-placed circular plate. The conical surface abutting blocks at the tail ends of the four sets of telescopic square columns are synchronously and symmetrically pushed to the inner wall of the chemical tank opening in the radial direction, and under the action of four-direction symmetrical force application pushing, the center lines of the horizontally-placed circular plate and the rotary scrubbing structure penetrating through the center of the circular block in the center of the tank opening are kept aligned with the center line of the chemical tank body; and collision and damage to the inner wall of the chemical tank due to asymmetric force application of the rotary scrubbing component are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of cleaning equipment, in particular to a novel chemical tank cleaning device. Background Art

[0002] New chemical tanks are containers used to store and process chemicals. They are widely used in chemical, pharmaceutical, food and beverage, petroleum and other industries. The design and application of chemical tanks are very important because they involve the safe storage, processing and transportation of chemicals. Chemical tank cleaning devices mainly refer to tools or equipment used to clean and scrub the inner wall of chemical tanks.

[0003] Existing Chinese patent document CN207288265U discloses a high-efficiency cleaning device for chemical open storage tanks, including a bottom box, a driven shaft is vertically rotatably provided in the bottom box, a driven pulley is provided on the driven shaft, and a driving pulley is wound between the driven pulley and the driving pulley; a horizontal rod is horizontally fixedly installed on the left column and the right column, a wedge block is slidably connected to the bottom surface of the horizontal rod through a guide slider, a roller is rotatably provided at the upper end of the guide rod and abuts against the wedge block, a motor is inverted at the lower end of the guide rod, a longitudinal return spring is sleeved on the guide rod, a threaded sleeve is provided on the threaded shaft through a threaded connection sleeve, and a rotating shaft is coaxially fixedly installed at the lower end of the threaded shaft. By adjusting the scissor support structure, the pressure plate can be made close to the inner wall of the storage tank, which improves the brushing effect of the brush on the pressure plate on the storage tank and achieves better cleaning effect. The extension degree of the scissor support structure can be adjusted by adjusting the threaded sleeve, which can adapt to the cleaning of storage tanks with different inner diameters and is simple and convenient to adjust. However, the cleaning device still has shortcomings: it uses an electric suction cup on the support platform to fix the tank body, but does not set a structure for aligning the center of the tank body with the center of the top rotating brushing structure. When the rotating brushing structure is running, it is easy for the two sets of brush structures to contact the inner wall of the tank asymmetrically, resulting in the brush structure bumping against the inner wall or causing the tank body to shift and shake due to the asymmetric thrust. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that in the above-mentioned chemical tank cleaning device, an electric suction cup on a support platform is used to fix the tank body, but no structure is set to align the center of the tank body with the center of the top rotating brushing structure. When the rotating brushing structure is in operation, the two groups of brush structures may contact the inner wall of the tank asymmetrically, causing the brush structure to bump against the inner wall or causing the tank body to shift and shake due to the asymmetric thrust. A new chemical tank cleaning device is provided.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new chemical tank cleaning device, comprising: a horizontally placed circular plate, the center of the bottom surface of the horizontally placed circular plate is fixedly connected to the center circular block of the tank mouth, one side of the center circular block of the tank mouth is fixedly connected to a telescopic square tube, the telescopic square tube is telescopically connected to a telescopic square column inside, a push column spring is provided between the telescopic square column and the telescopic square tube, the end of the telescopic square column is fixedly connected to a conical block, one end of the top surface of the telescopic square column is fixedly connected to a contraction column, a movable groove is provided at the top surface of the telescopic square tube corresponding to the contraction column, one end of the horizontally placed circular plate is penetrated by a sliding groove, a sliding block is slidably connected to the sliding groove, the bottom end of the sliding block is fixedly connected to a clamping block with an anti-slip tooth surface on one side, the top of the sliding block is screwed with a fixing screw, and the top surface of the horizontally placed circular plate is provided with a contraction ring.

[0006] As a further solution of the present invention: the telescopic square tube is arranged as a column structure with a hollow interior, one end of the push column spring is fixedly connected to the inner side of the telescopic square tube, and the other end is fixedly connected to one end of the telescopic square column located inside the telescopic square tube, and the contraction column is arranged at one end of the top surface of the telescopic square tube and passes through the top surface of the telescopic square tube and is located inside the movable groove.

[0007] As a further solution of the present invention: the telescopic square tube, telescopic square column, push column spring, conical surface block, contraction column and movable groove are all provided in four groups, which are symmetrically arranged in four directions outside the central circle block of the tank mouth.

[0008] As a further solution of the present invention: the sliding grooves and their internal connecting structures are each provided in four groups, and the direction of the groove body is consistent with the direction of the four groups of telescopic square tubes. The clamping block is provided with a side having an anti-slip tooth surface opposite to the conical side of the conical block, and the sliding block and the connecting structure at its bottom end are fixed relative to the sliding groove by a fixing screw.

[0009] As a further solution of the present invention: a servo motor is fixedly connected to the center of the top surface of the horizontally placed circular plate, a telescopic column 1 is provided at the output end of the servo motor, a telescopic column 2 is telescopically connected inside the telescopic column 1, two groups of limiting slide grooves are symmetrically provided on the outside of the telescopic column 1, a bottom pressure spring is fixedly connected to the top end of the telescopic column 1, and the bottom end of the bottom pressure spring is fixedly connected to the top end of the telescopic column 2.

[0010] As a further solution of the present invention: the outer side of the telescopic column one is hinged with a movable rod one and a movable rod two along the same vertical line, and the other ends of the movable rod one and the movable rod two are hinged with the same group of vertical brush plates, and the outer side of the telescopic column two is hinged with a movable rod three and a movable rod four along the same vertical line, and the other ends of the movable rod three and the movable rod four are hinged with the same group of L-shaped brush plates, and there are two groups of quadrilateral structures composed of the movable rod one, the movable rod two, the vertical brush plates and the telescopic column one body and the quadrilateral structure composed of the movable rod three, the movable rod four, the L-shaped brush plates and the telescopic column two body, and they are arranged perpendicular to each other.

[0011] As a further solution of the present invention: a tensioning spring 1 is diagonally connected between the vertical brush plate and the telescopic column 1, one end of the tensioning spring 1 is fixedly connected to the top hinge of the vertical brush plate, and the other end is fixedly connected to the bottom hinge of the telescopic column 1, and a tensioning spring 2 is diagonally connected between the L-shaped brush plate and the telescopic column 2, one end of the tensioning spring 2 is fixedly connected to the top hinge of the L-shaped brush plate, and the other end is fixedly connected to the bottom hinge of the telescopic column 2.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. In the utility model, the shrinkage ring is loosened to tighten and shrink the four groups of shrinkage columns, so that the telescopic square column is ejected from the telescopic square tube under the action of the push column spring, driving the conical block at the end of the four groups of telescopic square columns to push synchronously and symmetrically along the radial direction to the inner wall of the chemical tank mouth. Under the action of the four-way symmetrical force pushing, the rotating brushing structure provided with the horizontally placed circular plate and the center of the tank mouth center round block is aligned with the center line of the chemical tank body, avoiding the deviation of the center lines of the two, which causes the brushing parts to cause damage to the inner wall of the chemical tank due to asymmetric force during rotation or poor cleaning effect. In addition, the push column spring also broadens the application range of the alignment structure, adapting to the specifications of the chemical tank mouth within a certain size.

[0014] 2. The deformable quadrilateral structure formed by the hinge can easily meet the cleaning needs of chemical tanks with different inner diameters. The telescopic column one and the telescopic column two are prevented from completely separating through the hinges of the movable rod three and the movable rod four and the limiting slide groove, and the telescopic column two is pressed downward by the tension of the bottom pressure spring, keeping the L-shaped brush plate against the inner wall and bottom end of the tank, which is suitable for chemical tanks of different depths. The vertical brush plate and the L-shaped brush plate are arranged on two sets of planes perpendicular to each other, and when the servo motor drives the brushing structure to rotate, it can cover the entire inner wall and bottom surface of the tank, thereby expanding the brushing area of a single rotation and improving the cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of a novel chemical tank cleaning device described in the utility model;

[0016] Figure 2 This is a structural diagram of a conical surface stop block in a novel chemical tank cleaning device described in the present invention;

[0017] Figure 3 This is a structural diagram of a clamping block in a novel chemical tank cleaning device described in the utility model;

[0018] Figure 4 This is a structural diagram of a brush connection structure in a novel chemical tank cleaning device according to the present invention in a retracted state;

[0019] Figure 5 This is a structural diagram of a telescopic column 1 in a novel chemical tank cleaning device described in the utility model;

[0020] Figure 6 It is a structural schematic diagram of the telescopic column 2 in the novel chemical tank cleaning device described in the utility model.

[0021] In the figure: 1. Horizontally placed circular plate; 2. Center round block of tank mouth; 3. Telescopic square tube; 4. Telescopic square column; 5. Push column spring; 6. Conical block; 7. Contraction column; 8. Movable groove; 9. Sliding groove; 10. Sliding block; 11. Clamping block; 12. Anti-slip tooth surface; 13. Fixing screw; 14. Contraction ring; 15. Servo motor; 16. Telescopic column one; 1601. Movable rod one; 1602. Movable rod two; 1603. Vertical brush plate; 1604. Tension spring one; 17. Telescopic column two; 1701. Movable rod three; 1702. Movable rod four; 1703. L-shaped brush plate; 1704. Tension spring two; 18. Limiting slide groove; 19. Bottom pressure spring. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or connected in an integral manner; they can be mechanically connected or electrically connected; they can be directly connected, indirectly connected through an intermediate medium, or they can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The following describes the embodiments of the present invention based on its overall structure.

[0024] Reference Figures 1 to 3 In the embodiment of the present utility model, a new chemical tank cleaning device comprises: a horizontally placed circular plate 1, a tank mouth center circular block 2 is fixedly connected to the center of the bottom surface of the horizontally placed circular plate 1, a telescopic square cylinder 3 is fixedly connected to one side of the tank mouth center circular block 2, a telescopic square cylinder 3 is telescopically connected to a telescopic square column 4, a push column spring 5 is provided between the telescopic square column 4 and the telescopic square cylinder 3, a conical block 6 is fixedly connected to the end of the telescopic square column 4, a contraction column 7 is fixedly connected to one end of the top surface of the telescopic square column 4, a movable groove 8 is provided at the top surface of the telescopic square cylinder 3 corresponding to the contraction column 7, a sliding groove 9 is provided through one end of the horizontally placed circular plate 1, a sliding block 10 is slidably connected to the sliding groove 9, the bottom end of the sliding block 10 is fixedly connected to a clamping block 11 with an anti-slip tooth surface 12 on one side, the top of the sliding block 10 is screwed with a fixing screw 13, and a contraction ring 14 is provided on the top surface of the horizontally placed circular plate 1.

[0025] Reference Figures 1 to 3The telescopic square tube 3 is provided with an internal hollow column structure, one end of the push column spring 5 is fixedly connected to the inner side of the telescopic square tube 3, and the other end is fixedly connected to one end of the telescopic square column 4 located inside the telescopic square tube 3. The contraction column 7 is provided at one end of the top surface of the telescopic square tube 3 and passes through the top surface of the telescopic square tube 3 and is located inside the movable groove 8. The telescopic square tube 3, telescopic square column 4, push column spring 5, conical surface block 6, contraction column 7 and movable groove 8 are all provided in four groups, which are symmetrically arranged in four directions on the outside of the central circle block 2 of the tank mouth. There are four groups of sliding grooves 9 and their internal connection structures, and the direction position of the groove body is consistent with the direction position of the four groups of telescopic square tubes 3. The clamping block 11 is provided with an anti-slip tooth surface 12 on one side opposite to the conical side of the conical surface block 6. The sliding block 10 and the connection structure at its bottom are fixed to the relative position of the sliding groove 9 by a fixing screw 13.

[0026] The above scheme is adopted: the horizontally placed circular plate 1 is placed on the mouth of the chemical tank, and the contact surface between the two is smooth and has no large friction. By loosening the shrinkage ring 14 to tighten the four groups of shrinkage columns 7, the telescopic square column 4 is ejected from the telescopic square tube 3 under the action of the push column spring 5, driving the conical block 6 at the end of the four groups of telescopic square columns 4 to be pushed to the inner wall of the chemical tank mouth synchronously and symmetrically along the radial direction. Under the action of four-way symmetrical force pushing, the rotating brushing structure set through the center of the horizontally placed circular plate 1 and the center of the tank mouth center round block 2 is aligned with the center line of the chemical tank body, avoiding the deviation of the center line of the two, resulting in the brushing parts causing damage to the inner wall of the chemical tank due to asymmetric force during rotation or poor cleaning effect, and the push column spring 5 also broadens the application range of the alignment structure, adapting to the specifications of the chemical tank mouth within a certain size.

[0027] Reference Figures 4 to 6, a servo motor 15 is fixedly connected to the center of the top surface of the horizontally placed circular plate 1, and a telescopic column 16 is provided at the output end of the servo motor 15. The telescopic column 16 is telescopically connected to the telescopic column 2 17 inside, and two groups of limiting slides 18 are symmetrically provided on the outside of the telescopic column 16. The top of the telescopic column 16 is fixedly connected to the bottom spring 19, and the bottom end of the bottom spring 19 is fixedly connected to the top of the telescopic column 2 17. The outside of the telescopic column 16 is hinged with a movable rod 1601 and a movable rod 2 1602 along the same vertical line, and the other ends of the movable rod 1601 and the movable rod 2 1602 are hinged with the same group of vertical brush plates 1603. The outside of the telescopic column 2 17 is hinged with a movable rod 3 1701 and a movable rod 4 1702 along the same vertical line, and the other ends of the movable rod 3 1701 and the movable rod 4 1702 are hinged with the same group of L-shaped brush plates 1703. There are two groups of quadrilateral structures composed of movable rod 1601, movable rod 2 1602, vertical brush plate 1603 and telescopic column 16 body and two groups of quadrilateral structures composed of movable rod 3 1701, movable rod 4 1702, L-shaped brush plate 1703 and telescopic column 2 17 body, and they are arranged perpendicular to each other. A tensioning spring 1604 is diagonally connected between the vertical brush plate 1603 and the telescopic column 1 16, one end of the tensioning spring 1604 is fixedly connected to the top hinge of the vertical brush plate 1603, and the other end is fixedly connected to the bottom hinge of the telescopic column 16, a tensioning spring 2 1704 is diagonally connected between the L-shaped brush plate 1703 and the telescopic column 2 17, one end of the tensioning spring 2 1704 is fixedly connected to the top hinge of the L-shaped brush plate 1703, and the other end is fixedly connected to the bottom hinge of the telescopic column 2 17.

[0028] The above scheme is adopted: the deformable quadrilateral structure formed by the hinge is convenient for meeting the cleaning needs of chemical tanks with different inner diameters. The telescopic column 16 and the telescopic column 2 17 are prevented from being completely separated by the hinge parts of the movable rod 3 1701 and the movable rod 4 1702 and the limiting slide 18, and the telescopic column 2 17 is pressed downward by the tension of the bottom pressure spring 19, keeping the L-shaped brush plate 1703 against the inner wall and bottom end of the tank, which is suitable for chemical tanks with different vertical depths. The vertical brush plate 1603 and the L-shaped brush plate 1703 are arranged on two sets of planes perpendicular to each other, and when the servo motor 15 drives the brushing structure to rotate, it can cover the entire inner wall and bottom surface of the tank, expand the single rotation brushing area, and improve the cleaning efficiency. When the device is idle, it is suspended by an external support frame.

[0029] The working principle of the utility model is as follows: when in use, a cleaning liquid is introduced into the interior of the chemical tank, the horizontally placed circular plate 1 is naturally placed on the mouth of the chemical tank to be cleaned, the shrink ring 14 is loosened to shrink the four groups of shrinkage columns 7, so that the telescopic square column 4 is ejected from the telescopic square tube 3 under the action of the push column spring 5, and the conical surface resistance blocks 6 at the ends of the four groups of telescopic square columns 4 are synchronously and symmetrically pushed to the inner wall of the chemical tank mouth in the radial direction. Under the action of the four-way symmetrical force pushing, the rotating brushing structure provided with the center of the horizontally placed circular plate 1 and the center of the tank mouth center round block 2 is aligned with the center line of the chemical tank body to avoid the two from being in conflict. The deviation of the center line causes the brushing parts to cause damage to the inner wall of the chemical tank or poor cleaning effect due to asymmetric force during the rotation process, and the push column spring 5 also broadens the application range of the alignment structure, adapting to the specifications of the chemical tank mouth within a certain size. The clamping block 11 with an anti-slip tooth surface 12 is flexibly moved in the direction of the sliding groove 9 through the sliding block 10 and the fixing screw 13 and can be accurately positioned and fixed. After the center line is aligned, the clamping block 11 is controlled to retract toward the center point to cooperate with the conical surface block 6 to clamp the chemical tank mouth, thereby increasing the stability of the horizontally placed circular plate 1. The movable rod 1601 and the movable rod 216 02. The vertical brush plate 1603 and the telescopic column 16 are hinged to each other, so that the vertical brush plate 1603 can be manually controlled to move closer to the telescopic column 16 to deform the quadrilateral structure into a parallelogram, which is convenient for the scrubbing structure to pass through the mouth of chemical tanks of different specifications and extend into the interior of the tank body. Then, under the tension of the tension spring 1604, the quadrilateral structure is stretched open to make the vertical brush plate 1603 press against the inner wall of the tank body. The telescopic column 17 and its connecting structure are contracted and expanded according to the same principle. The deformable quadrilateral structure formed by the hinge is convenient for meeting the cleaning needs of chemical tanks with different inner diameters. The retractable column 16 and the telescopic column 2 17 are prevented from being completely separated by the hinges of the movable rod 3 1701 and the movable rod 4 1702 and the limiting slide 18, and the telescopic column 2 17 is pressed downward by the tension of the bottom pressure spring 19, keeping the L-shaped brush plate 1703 against the inner wall and bottom end of the tank body, which is suitable for chemical tanks of different longitudinal depths. The vertical brush plate 1603 and the L-shaped brush plate 1703 are arranged on two sets of planes perpendicular to each other, and when the servo motor 15 drives the brushing structure to rotate, it can cover the entire inner wall and bottom surface of the tank body, thereby expanding the brushing area of a single rotation and improving the cleaning efficiency.

[0030] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A new chemical tank cleaning device, characterized in that: include: A circular plate (1) is placed horizontally, wherein the center of the bottom surface of the horizontal circular plate (1) is fixedly connected to a tank mouth center circular block (2), one side of the tank mouth center circular block (2) is fixedly connected to a telescopic square tube (3), the interior of the telescopic square tube (3) is telescopically connected to a telescopic square column (4), a push column spring (5) is provided between the telescopic square column (4) and the telescopic square tube (3), the end of the telescopic square column (4) is fixedly connected to a conical surface block (6), and one end of the top surface of the telescopic square column (4) is fixedly connected to a contraction column ( 7), a movable groove (8) is provided at a position corresponding to the shrinkage column (7) on the top surface of the telescopic square tube (3), a sliding groove (9) is provided through one end of the horizontally placed circular plate (1), a sliding block (10) is slidably connected inside the sliding groove (9), a clamping block (11) with an anti-slip tooth surface (12) on one side is fixedly connected to the bottom end of the sliding block (10), a fixing screw (13) is screwed to the top end of the sliding block (10), and a shrinkage ring (14) is provided on the top surface of the horizontally placed circular plate (1).

2. A novel chemical tank cleaning device according to claim 1, characterized in that: The telescopic square tube (3) is configured as a column structure with a hollow interior. One end of the push column spring (5) is fixedly connected to the inner side of the telescopic square tube (3), and the other end is fixedly connected to one end of the telescopic square column (4) located inside the telescopic square tube (3). The contraction column (7) is provided at one end of the top surface of the telescopic square tube (3) and passes through the top surface of the telescopic square tube (3) and is located inside the movable groove (8).

3. A novel chemical tank cleaning device according to claim 1, characterized in that: The telescopic square tube (3), telescopic square column (4), push column spring (5), conical surface stop block (6), contraction column (7) and movable groove (8) are all provided in four groups, and are symmetrically arranged in four directions outside the central circular block (2) of the tank mouth.

4. A novel chemical tank cleaning device according to claim 1, characterized in that: The number of the sliding grooves (9) and their internal connection structures is four, and the directional position of the groove body is consistent with the directional position of the four groups of telescopic square cylinders (3). The clamping block (11) is provided with a side of the anti-slip tooth surface (12) opposite to the conical side of the conical surface block (6). The sliding block (10) and the connection structure at its bottom are fixed relative to the sliding groove (9) by a fixing screw (13).

5. A novel chemical tank cleaning device according to claim 1, characterized in that: A servo motor (15) is fixedly connected to the center of the top surface of the horizontally placed circular plate (1), a telescopic column 1 (16) is provided at the output end of the servo motor (15), the telescopic column 1 (16) is telescopically connected to the telescopic column 2 (17) inside, two groups of limiting sliding grooves (18) are symmetrically provided on the outside of the telescopic column 1 (16), a bottom pressure spring (19) is fixedly connected to the top end of the telescopic column 1 (16), and the bottom end of the bottom pressure spring (19) is fixedly connected to the top end of the telescopic column 2 (17).

6. A novel chemical tank cleaning device according to claim 5, characterized in that: The outer side of the telescopic column 1 (16) is hinged with a movable rod 1 (1601) and a movable rod 2 (1602) along the same vertical line, and the other ends of the movable rod 1 (1601) and the movable rod 2 (1602) are hinged with the same set of vertical brush plates (1603). The outer side of the telescopic column 2 (17) is hinged with a movable rod 3 (1701) and a movable rod 4 (1702) along the same vertical line, and the movable rod 3 (1701) and the movable rod 4 (1702) are hinged. The other ends of the four (1702) are hinged with the same set of L-shaped brush plates (1703), and the quadrilateral structure composed of the movable rod one (1601), the movable rod two (1602), the vertical brush plate (1603) and the telescopic column one (16) body and the quadrilateral structure composed of the movable rod three (1701), the movable rod four (1702), the L-shaped brush plate (1703) and the telescopic column two (17) body are both provided in two groups, and are arranged perpendicular to each other.

7. A novel chemical tank cleaning device according to claim 6, characterized in that: A tensioning spring 1 (1604) is diagonally connected between the vertical brush plate (1603) and the telescopic column 1 (16), one end of the tensioning spring 1 (1604) is fixedly connected to the top hinge of the vertical brush plate (1603), and the other end is fixedly connected to the bottom hinge of the telescopic column 1 (16). A tensioning spring 2 (1704) is diagonally connected between the L-shaped brush plate (1703) and the telescopic column 2 (17), one end of the tensioning spring 2 (1704) is fixedly connected to the top hinge of the L-shaped brush plate (1703), and the other end is fixedly connected to the bottom hinge of the telescopic column 2 (17).

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