A sand brushing device for cleaning floating sand on the surface of HDPE self-adhesive film

Abstract

This utility model discloses a sand-brushing device for cleaning loose sand from the surface of HDPE self-adhesive film. It includes a frame, symmetrically arranged L-shaped support plates, sand-brushing rollers, a swing plate, a rotating assembly, an adjusting assembly, a guide roller, and a recovery chute. The sand-brushing rollers are driven by the rotating assembly to rotate synchronously in opposite directions, performing two sand-brushing cleaning operations on the self-adhesive film surface. The adjusting assembly can adjust the gap between the sand-brushing rollers and the guide rollers to accommodate different film thicknesses. The recovery chute, located below the sand-brushing rollers, collects detached loose sand for recycling. The device also includes a sliding long plate with comb-like teeth and a reciprocating sliding assembly, which can automatically clean residual loose sand from the brush bristles and prevent clogging. This utility model has a reasonable structure, is easy to operate, and can efficiently remove loose sand from the surface of HDPE self-adhesive film.

Description

Technical Field

[0001] This utility model relates to the technical field of HDPE self-adhesive film production equipment, and in particular to a sand-brushing device for cleaning the surface of HDPE self-adhesive film. Background Technology

[0002] HDPE self-adhesive membrane is a multi-layer composite waterproof material. This roll uses high-density polyethylene (HDPE) film as the main waterproof layer material. The upper surface of the main waterproof layer material is covered with a polymer self-adhesive layer and an anti-sticking granular protective layer, while the lower surface of the main waterproof layer material has a polymer self-adhesive layer and an anti-sticking release film. Currently, the anti-sticking granular protective layer of HDPE self-adhesive membrane is mainly made of inorganic granular materials such as fine ceramic sand. When covering and processing the main waterproof layer material, the granular material is firmly embedded into the not-completely-cooled polymer self-adhesive layer mainly through processes such as electrostatic sand planting or mechanical spreading.

[0003] However, after the granules are covered and pressed, not all granules are effectively and firmly bonded. A large amount of "loose sand" or "free sand" remains on the surface, not fully bonded to the self-adhesive layer. This loose sand not only falls off during winding, causing dust pollution in the production environment, but also causes the layers of the roll to stick together, damaging the anti-adhesive protective layer structure and making subsequent unwinding difficult. Secondly, during installation, the loose sand contaminates the bonding interface, severely weakening the self-adhesive sealing effect between the roll and the substrate (such as concrete) or between rolls, leaving potential leakage risks. Therefore, there is an urgent need to develop a device that can efficiently clean the loose sand from the surface of HDPE self-adhesive film during production. Utility Model Content

[0004] The purpose of this invention is to provide a sand-brushing device for cleaning the surface of HDPE self-adhesive film, which has the effect of efficiently cleaning the surface of HDPE self-adhesive film.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a sand-brushing device for cleaning floating sand from the surface of HDPE self-adhesive film, comprising a frame, a pair of mutually symmetrical L-shaped support plates fixed to the top of the frame, a pair of horizontally parallel sand-brushing rollers located between the two L-shaped support plates, a pair of swing plates rotatably connected to the two ends of the sand-brushing rollers and respectively hinged to the two L-shaped support plates, two sets of rotating components that drive the two sand-brushing rollers to rotate, two sets of adjusting components that adjust and control the swing of the two swing plates relative to the L-shaped support plates, a pair of guide rollers rotatably disposed on the top of the frame and parallel to the sand-brushing rollers, and a pair of guide rollers rotatably disposed on the frame. The machine includes a guide roller 2 parallel to the sand brushing roller in the middle, and a recovery slide rail fixedly set at an incline in the middle of the frame. The two sand brushing rollers are located between the two guide rollers 1, and the two guide rollers 1 are close to the bristles of the two sand brushing rollers respectively. The two guide rollers 1 are located between the two guide rollers 2, and the height of the two guide rollers 2 is lower than the height of the two guide rollers 1. Two sets of rotating components are symmetrically located on both sides of the frame or the sand brushing rollers respectively, and drive the two sand brushing rollers to rotate synchronously in opposite directions. The recovery slide rail is located below the two guide rollers 1 and the sand brushing rollers, and receives the floating sand brushed off by the sand brushing rollers. The two guide rollers 2 are located below the recovery slide rail on both sides, and guide the self-adhesive film to bypass the recovery slide rail.

[0006] A further feature of this invention is that a hinge cylinder is fixedly provided on the side of the swing plate facing the L-shaped support plate, and a double-headed stud is slidably inserted on the hinge cylinder, with both ends of the double-headed stud sliding through the swing plate and the L-shaped support plate respectively. The two ends of the double-headed stud are respectively threadedly connected to limit nuts, and one side of each limit nut is tightly attached to one side of the L-shaped support plate and the swing plate respectively.

[0007] A further feature of this invention is that the rotating assembly includes a rotating shaft rotatably mounted on the frame, a worm gear reducer motor mounted on the frame and connected to the rotating shaft rotatably at its output end, a synchronous pulley rotatably fixed on the rotating shaft rotatably, a synchronous pulley rotatably fixed at one end of the sand brush roller, and a synchronous belt mounted on the synchronous pulley rotatably and the synchronous pulley rotatably. The rotating shaft rotatably passes through the swing plate and is fixedly connected to the synchronous pulley rotatably.

[0008] A further feature of this invention is that the adjustment assembly includes a pair of limiting plates fixed to the L-shaped support plate and located on both sides of the swing plate, a pair of adjusting nuts fixed to one side of the two limiting plates, and a pair of adjusting screws threadedly connected to the two adjusting nuts and moving through the two limiting plates, with the ends of the rods of the two adjusting screws respectively in close contact with both sides of the swing plate.

[0009] The present invention is further configured to include a sliding long plate slidably disposed between two L-shaped support plates, a plurality of comb teeth evenly fixed on both sides of the sliding plate, and a reciprocating sliding assembly for driving the sliding long plate to reciprocate between the two L-shaped support plates. The sliding long plate is located parallel to the middle of the two brush rollers, and the comb teeth on both sides of the sliding long plate can respectively comb and clean the bristles of the two brush rollers. The reciprocating sliding direction of the sliding long plate is parallel to the axis of the brush rollers.

[0010] A further feature of this invention is that the top cross-section of the sliding plate is arc-shaped.

[0011] A further feature of this invention is that: vertical baffles are fixedly installed at both ends of the sliding long plate; a pair of guide rods are fixedly installed on the side of the baffles facing away from the sliding long plate; the two guide rods slide through the L-shaped support plate; springs are sleeved on the guide rods; and the two ends of the springs are fixedly connected to the baffles and the L-shaped support plate, respectively.

[0012] The present invention is further configured as follows: the reciprocating sliding assembly includes a pair of triangular brackets respectively fixedly connected to one side of two L-shaped support plates, a pair of rotating disks respectively vertically rotating the two triangular brackets, a pair of servo motors respectively fixed on the two triangular brackets and whose output ends are connected to the bottom of the two rotating disks, a synchronous long plate with both ends resting on the top of the two rotating disks, a pair of eccentric columns vertically fixed to the top of the two rotating disks and rotating through the synchronous long plate, and a sliding groove first opened at the bottom of the sliding long plate for the eccentric columns to extend into and slide. The axis of the eccentric column and the rotation center line of the rotating disk are parallel and spaced apart from each other. The sliding direction of the eccentric column relative to the sliding groove first is perpendicular to the reciprocating sliding direction of the sliding long plate.

[0013] A further feature of this invention is that: a plurality of parallel and spaced synchronous columns are fixedly arranged at the top center of the synchronous long plate; the synchronous columns and two eccentric columns are located on a straight line of a parallel sliding long plate; a second sliding groove is provided at the bottom of the sliding long plate for the synchronous columns to extend into and slide; the second sliding groove is parallel to the middle of the two first sliding grooves and has the same length.

[0014] A further feature of this invention is that a collection box is placed on one side of the frame, and the lower end of the recycling chute is located above the collection box.

[0015] The beneficial effects of this utility model are:

[0016] 1. By using dual sanding rollers to rotate synchronously in opposite directions, the HDPE self-adhesive film is sanded twice, significantly improving the efficiency and thoroughness of sand removal. In addition, the gap between the sanding roller and the guide roller can be flexibly adjusted with the adjustment component, making it suitable for self-adhesive films of different thicknesses and materials, thus improving the versatility of the equipment.

[0017] 2. The inclined recycling chute can collect the brushed-off loose sand in a concentrated manner, which is convenient for recycling and reuse, reduces material costs and environmental pollution.

[0018] 2. By setting a sliding long plate with comb teeth and a reciprocating sliding component, the residual sand on the brush bristles can be automatically cleaned, avoiding bristle clogging and maintaining a long-lasting cleaning effect. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of this embodiment;

[0021] Figure 2 This is a schematic diagram of the structure of the rotating component and the adjusting component in this embodiment;

[0022] Figure 3 This is a schematic diagram of the reciprocating sliding component in this embodiment;

[0023] Figure 4 This is a schematic diagram showing the positions of slide rail 1 and slide rail 2 in this embodiment;

[0024] In the diagram: 1. Frame; 11. Guide roller one; 12. Guide roller two; 2. L-shaped support plate; 3. Brushing roller; 4. Swing plate; 41. Hinge cylinder; 42. Double-ended stud; 43. Limit nut; 5. Rotating assembly; 51. Rotating shaft one; 52. Worm gear reducer motor; 53. Synchronous pulley one; 54. Synchronous pulley two; 55. Synchronous belt; 6. Adjusting assembly; 61. Limit plate; 62. Adjusting nut; 63. Adjusting screw; 7. Recycling slide; 8. Sliding long plate; 81. Comb teeth; 82. Baffle; 83. Guide rod; 84. Spring; 9. Reciprocating sliding assembly; 91. Triangular bracket; 92. Rotary disk; 93. Servo motor; 94. Synchronous long plate; 95. Eccentric column; 96. Slide chute one; 97. Synchronous column; 98. Slide chute two; 10. Collection box. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0026] Example: A sandblasting device for cleaning loose sand from the surface of HDPE self-adhesive film, such as... Figure 1-4 As shown, the assembly includes a frame 1, a pair of symmetrical L-shaped support plates 2 fixed to the top of the frame 1, a pair of horizontally parallel brushing rollers 3 located between the two L-shaped support plates 2, a pair of swing plates 4 rotatably connected to the two ends of the brushing rollers 3 and respectively hinged to the two L-shaped support plates 2, two sets of rotating components 5 that drive the two brushing rollers 3 to rotate, two sets of adjusting components 6 that adjust and control the swing of the two swing plates 4 relative to the L-shaped support plates 2, a pair of guide rollers 11 rotatably mounted on the top of the frame 1 and parallel to the brushing rollers 3, a pair of guide rollers 2 rotatably mounted in the middle of the frame 1 and parallel to the brushing rollers 3, and an inclined fixed component in the middle of the frame 1. The recovery chute 7 is located between two guide rollers 11, with the two guide rollers 11 close to the bristles of the two brush rollers 3. The two guide rollers 11 are located between two guide rollers 212, with the height of the two guide rollers 212 lower than the height of the two guide rollers 11. Two sets of rotating components 5 are symmetrically located on both sides of the frame 1 or the brush rollers 3, and drive the two brush rollers 3 to rotate synchronously in opposite directions. The recovery chute 7 is located below the two guide rollers 11 and the brush rollers 3, and receives the floating sand brushed off by the brush rollers 3. The two guide rollers 212 are located below the recovery chute 7 on both sides, and guide the self-adhesive film to bypass the recovery chute 7.

[0027] By adopting the above technical solution, after the HDPE self-adhesive film covers the processed inorganic particles, it first passes through the gap between a pair of brushing rollers 3 and guide rollers 11. Driven by the rotating component 5, the brushing rollers 3 rotate actively, and the bristles on their sides contact and rub against the surface of the HDPE self-adhesive film, thereby initially cleaning the floating sand on the film surface. Subsequently, the two guide rollers 12 guide the HDPE self-adhesive film around the bottom of the recycling chute 7, and make it pass through the gap between another pair of brushing rollers 3 and guide rollers 11. During this process, the brushing rollers 3 continue to rotate, performing secondary cleaning on the film surface, further removing the floating sand attached to the surface, thereby achieving thorough cleaning. At the same time, the brushed-off floating sand falls and collects in the recycling chute 7, facilitating centralized recycling and reuse. This technical solution not only effectively removes floating sand from the film surface, but also improves the utilization rate of inorganic particles, helping to reduce material procurement costs. The adjustment component 6 can reduce or increase the gap width between the brush roller 3 and the guide roller 11 by adjusting the angle position of the swing plate 4 relative to the L-shaped support plate 2, thereby adapting to HDPE self-adhesive film of different thicknesses or appropriately adjusting the cleaning force of the brush roller 3.

[0028] Furthermore, a hinge cylinder 41 is fixedly installed on the side of the swing plate 4 facing the L-shaped support plate 2. A double-ended stud 42 is slidably inserted through the hinge cylinder 41, with both ends of the double-ended stud 42 sliding through the swing plate 4 and the L-shaped support plate 2, respectively. The two ends of the double-ended stud 42 are threadedly connected to limit nuts 43, and one side of each limit nut 43 is tightly attached to one side of the L-shaped support plate 2 and the swing plate 4, respectively. By using the aforementioned hinge cylinder 41, double-ended stud 42, and limit nuts 43, not only is the hinged connection between the swing plate 4 and the L-shaped support plate 2 achieved, but a gap is also left between the swing plate 4 and the L-shaped support plate 2 for the installation and movement of the rotating assembly 5.

[0029] Furthermore, the rotating assembly 5 includes a rotating shaft 51 rotatably mounted on the frame 1, a worm gear reducer motor 52 mounted on the frame 1 and connected to the rotating shaft 51 at its output end, a synchronous pulley 53 fixed on the rotating shaft 51, a synchronous pulley 54 fixed to one end of the brushing roller 3, and a synchronous belt 55 mounted on the synchronous pulleys 53 and 54. The rotating shaft 51 is located below and between the two brushing rollers 3. The synchronous pulleys 53, 54, and belt are located between the L-shaped support plate 2 and the swing plate 4. The end of the brushing roller 3 rotates through the swing plate 4 and is fixedly connected to the synchronous pulley 54. By using the rotating assembly 5, not only can the brushing roller 3 be driven to rotate, but the elasticity of the synchronous belt 55 can also accommodate small changes in the position of the brushing roller 3.

[0030] Furthermore, the adjustment assembly 6 includes a pair of limiting plates 61 fixed to the L-shaped support plate 2 and located on both sides of the swing plate 4, a pair of adjusting nuts 62 fixed to one side of the two limiting plates 61, and a pair of adjusting screws 63 threadedly connected to the two adjusting nuts 62 and moving through the two limiting plates 61 respectively. The ends of the rods of the two adjusting screws 63 are respectively in close contact with both sides of the swing plate 4. By using the above-mentioned adjustment assembly 6, when the user manually turns the adjusting screws 63 on both sides of the swing plate 4, causing the two adjusting screws 63 to move forward and backward synchronously, the angle position of the swing plate 4 relative to the L-shaped support plate 2 can be adjusted simply and quickly.

[0031] Furthermore, the system also includes a sliding long plate 8 slidably disposed between the two L-shaped support plates 2, multiple comb teeth 81 evenly fixed on both sides of the sliding plate, and a reciprocating sliding assembly 9 that drives the sliding long plate 8 to reciprocate between the two L-shaped support plates 2. The sliding long plate 8 is parallel to the two brush rollers 3, and the comb teeth 81 on both sides of the sliding long plate 8 can respectively comb and clean the bristles of the two brush rollers 3. The reciprocating sliding direction of the sliding long plate 8 is parallel to the axis of the brush rollers 3. By using the above-mentioned sliding long plate 8 and comb teeth 81, not only can the residual loose sand on the bristles of the two brush rollers 3 be combed and cleaned, but the reciprocating sliding motion of the sliding long plate 8 can also drive the comb teeth 81 to swing the bristles, so that the residual loose sand can be quickly and completely removed from the bristles of the brush rollers 3, thereby avoiding bristle clogging and maintaining a long-lasting cleaning effect.

[0032] Furthermore, the top cross-section of the sliding plate 8 is arc-shaped, which can prevent loose sand from accumulating on the top of the sliding plate 8.

[0033] Furthermore, vertical baffles 82 are fixedly installed at both ends of the sliding long plate 8. A pair of guide rods 83 are fixedly installed on the side of the baffles 82 facing away from the sliding long plate 8, and the two guide rods 83 slide through the L-shaped support plate 2. Springs 84 are sleeved on the guide rods 83, and the two ends of the springs 84 are fixedly connected to the baffles 82 and the L-shaped support plate 2, respectively. By using the baffles 82 and guide rods 83, not only can the sliding long plate 8 slide stably between the two L-shaped support plates 2, but the springs 84 on the guide rods 83 can also increase the oscillation frequency of the comb teeth 81 during the sliding of the sliding long plate 8, thereby enhancing the combing and cleaning effect of the comb teeth 81.

[0034] Furthermore, the reciprocating sliding assembly 9 includes a pair of triangular brackets 91 respectively fixedly connected to one side of the two L-shaped support plates 2, a pair of rotating disks 92 respectively vertically rotatably mounted on the two triangular brackets 91, a pair of servo motors 93 respectively fixed on the two triangular brackets 91 and whose output ends are connected to the bottom of the two rotating disks 92, a synchronous long plate 94 with both ends resting on the top of the two rotating disks 92, a pair of eccentric columns 95 vertically fixed to the top of the two rotating disks 92 and rotatably passing through the synchronous long plate 94, and a sliding groove 96 opened at the bottom of the sliding long plate 8 for the eccentric columns 95 to extend into and slide. The axis of the eccentric column 95 and the rotation center line of the rotating disk 92 are parallel and spaced apart from each other. The sliding direction of the eccentric column 95 relative to the sliding groove 96 is perpendicular to the reciprocating sliding direction of the sliding long plate 8.

[0035] By employing the reciprocating sliding assembly 9, when the sliding plate 8 needs to be driven to reciprocate, firstly, the two servo motors 93 drive the two rotating disks to rotate synchronously in the same direction. Then, the eccentric column 95 rotates around the rotating disks. Since the eccentric column 95 also slides in the bottom groove 96 of the sliding plate 8, it will slide relative to the groove 96 during its rotation, and push the sliding plate 8 back and forth through the groove 96, thereby achieving the reciprocating sliding effect of the sliding plate 8. The synchronous plate 94 can physically synchronize the output speed of the two servo motors 93, ensuring the stable synchronous operation of the two servo motors 93.

[0036] Furthermore, a plurality of parallel, spaced-apart synchronous columns 97 are fixedly disposed at the top center of the synchronous long plate 94. The synchronous columns 97 and the two eccentric columns 95 are located on a straight line parallel to the sliding long plate 8. The bottom of the sliding long plate 8 has a second sliding groove 98 for the synchronous columns 97 to extend into and slide. The second sliding groove 98 is parallel to the two first sliding grooves 96 and has the same length. By using the above-mentioned synchronous columns 97, the pressure of pushing the sliding long plate 8 can be shared with the two eccentric columns 95, thus extending the service life of the eccentric columns 95.

[0037] Furthermore, a collection box 10 is placed on one side of the frame 1, and the lower end of the recycling chute 7 is located above the collection box 10, which can collect the floating sand that slides out from the lower end of the recycling chute 7 for reuse.

Claims

1. A sand-brushing device for cleaning loose sand from the surface of HDPE self-adhesive film, characterized in that, Includes a frame (1), a pair of symmetrical L-shaped support plates (2) fixed to the top of the frame (1), a pair of horizontally parallel brushing rollers (3) located between the two L-shaped support plates (2), a pair of swing plates (4) rotatably connected to the two ends of the brushing rollers (3) and respectively hinged to the two L-shaped support plates (2), two sets of rotating components (5) respectively driving the two brushing rollers (3) to rotate, two sets of adjusting components (6) adjusting and controlling the swing of the two swing plates (4) relative to the L-shaped support plates (2), a pair of guide rollers I (11) rotatably set on the top of the frame (1) and parallel to the brushing rollers (3), a pair of guide rollers II (12) rotatably set in the middle of the frame (1) and parallel to the brushing rollers (3), and a recycling unit that is tilted and fixed in the middle of the frame (1). The slide (7) has two sand brushing rollers (3) located between two guide rollers (11) and the two guide rollers (11) are close to the bristles of the two sand brushing rollers (3). The two guide rollers (11) are located between two guide rollers (12) and the height of the two guide rollers (12) is lower than the height of the two guide rollers (11). Two sets of rotating components (5) are symmetrically located on both sides of the frame (1) or the sand brushing rollers (3) and drive the two sand brushing rollers (3) to rotate synchronously in opposite directions. The recycling slide (7) is located below the two guide rollers (11) and the sand brushing rollers (3) and is connected to the floating sand brushed off by the sand brushing rollers (3). The two guide rollers (12) are located below the two sides of the recycling slide (7) and guide the self-adhesive film to bypass the recycling slide (7).

2. The sand-brushing device for cleaning loose sand from the surface of HDPE self-adhesive film according to claim 1, characterized in that: A hinge cylinder (41) is fixedly installed on the side of the swing plate (4) facing the L-shaped support plate (2). A double-headed stud (42) is slidably inserted on the hinge cylinder (41), and the two ends of the double-headed stud (42) slide through the swing plate (4) and the L-shaped support plate (2) respectively. The two ends of the double-headed stud (42) are threadedly connected to limit nuts (43), and one side of the two limit nuts (43) is tightly attached to the L-shaped support plate (2) and the swing plate (4) respectively.

3. The sand-brushing device for cleaning loose sand from the surface of HDPE self-adhesive film according to claim 2, characterized in that: The rotating assembly (5) includes a rotating shaft (51) rotatably mounted on the frame (1), a worm gear reducer motor (52) mounted on the frame (1) and connected to the rotating shaft (51) at its output end, a synchronous pulley (53) fixed on the rotating shaft (51), a synchronous pulley (54) fixed to one end of the sand brush roller (3), and a synchronous belt (55) mounted on the synchronous pulley (53) and the synchronous pulley (54). The rotating shaft (51) is located in the middle and below the two sand brush rollers (3). The synchronous pulley (53), the synchronous pulley (54) and the belt are located between the L-shaped support plate (2) and the swing plate (4). The end of the sand brush roller (3) rotates through the swing plate (4) and is fixedly connected to the synchronous pulley (54).

4. The sand-brushing device for cleaning loose sand from the surface of HDPE self-adhesive film according to claim 2, characterized in that: The adjustment assembly (6) includes a pair of limiting plates (61) fixed on the L-shaped support plate (2) and located on both sides of the swing plate (4), a pair of adjusting nuts (62) fixed on one side of the two limiting plates (61), and a pair of adjusting screws (63) threadedly connected to the two adjusting nuts (62) and moving through the two limiting plates (61). The ends of the rods of the two adjusting screws (63) are respectively close to both sides of the swing plate (4).

5. A sand-brushing device for cleaning loose sand from the surface of HDPE self-adhesive film according to claim 1, characterized in that: It also includes a sliding long plate (8) that is slidably disposed between the two L-shaped support plates (2), a plurality of comb teeth (81) that are evenly fixed on both sides of the slide plate, and a reciprocating sliding assembly (9) that drives the sliding long plate (8) to reciprocate between the two L-shaped support plates (2). The sliding long plate (8) is located parallel to the middle of the two brush rollers (3), and the comb teeth (81) on both sides of the sliding long plate (8) can comb and clean the bristles of the two brush rollers (3) respectively. The reciprocating sliding direction of the sliding long plate (8) is parallel to the axis of the brush roller (3).

6. A sand-brushing device for cleaning loose sand from the surface of HDPE self-adhesive film according to claim 5, characterized in that: The top cross-section of the sliding plate (8) is arc-shaped.

7. A sand-brushing device for cleaning loose sand from the surface of HDPE self-adhesive film according to claim 5, characterized in that: Vertical baffles (82) are fixedly installed at both ends of the sliding long plate (8). A pair of guide rods (83) are fixedly installed on the side of the baffle (82) facing away from the sliding long plate (8). The two guide rods (83) slide through the L-shaped support plate (2). A spring (84) is sleeved on the guide rod (83). The two ends of the spring (84) are fixedly connected to the baffle (82) and the L-shaped support plate (2).

8. A sand-brushing device for cleaning loose sand from the surface of HDPE self-adhesive film according to claim 5, characterized in that: The reciprocating sliding assembly (9) includes a pair of triangular brackets (91) fixedly connected to one side of two L-shaped support plates (2), a pair of rotating disks (92) vertically rotating on the two triangular brackets (91), a pair of servo motors (93) fixed on the two triangular brackets (91) and whose output ends are connected to the bottom of the two rotating disks (92), a synchronous long plate (94) with its two ends resting on the top of the two rotating disks (92), a pair of eccentric columns (95) vertically fixed on the top of the two rotating disks (92) and rotating through the synchronous long plate (94), and a first sliding groove (96) opened at the bottom of the sliding long plate (8) for the eccentric columns (95) to extend into and slide. The axis of the eccentric column (95) and the rotation center line of the rotating disk (92) are parallel and spaced apart from each other. The sliding direction of the eccentric column (95) relative to the sliding groove (96) is perpendicular to the reciprocating sliding direction of the sliding long plate (8).

9. A sand-brushing device for cleaning loose sand from the surface of HDPE self-adhesive film according to claim 8, characterized in that: The top center of the synchronizing plate (94) is fixed with multiple parallel synchronizing columns (97). The synchronizing columns (97) and two eccentric columns (95) are located on a straight line of a parallel sliding plate (8). The bottom of the sliding plate (8) is provided with a second sliding groove (98) for the synchronizing columns (97) to extend and slide. The second sliding groove (98) is located parallel to the middle of the two first sliding grooves (96) and has the same length.

10. A sand-brushing device for cleaning loose sand from the surface of HDPE self-adhesive film according to claim 1, characterized in that: A collection box (10) is placed on one side of the frame (1), and the lower end of the recycling chute (7) is located above the collection box (10).

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