A cleaning device for plastic product processing

Abstract

The application relates to the technical field of plastic product cleaning, and discloses a cleaning device for plastic product processing, which comprises a device frame, built-in trusses in the device frame, a lower pressing belt rotatably arranged at the upper end of the device frame, support shafts symmetrically arranged at the inner wall of the lower pressing belt, built-in trusses horizontally arranged in the device frame, lifting rods arranged on the upper surfaces of the built-in trusses, a cleaning conveying belt slidably arranged at the upper end of the lifting rod, and a negative pressure belt also slidably arranged at the upper end of the lifting rod. Through the action of the cleaning frame, the cleaning device can provide cleaning liquid when cleaning the plastic product, and through the sliding of the cleaning belt, the rotation of the rotating disc is increased on the basis of providing the bristles with the friction cleaning action on the plastic product, the diversity of the friction cleaning action of the bristles is increased, the cleaning effect on the plastic product is improved, and compared with the conventional structure, the cleaning is greatly facilitated.

Description

Technical Field

[0001] This invention relates to the field of plastic product cleaning technology, specifically a cleaning device for processing plastic products. Background Technology

[0002] Plastic products are a general term for everyday and industrial goods made primarily from plastics. This includes products manufactured using processes such as injection molding and thermoforming. Plastics are a class of synthetic polymer materials with malleability. Together with synthetic rubber and synthetic fibers, they form the three essential synthetic materials for daily life. Specifically, plastics are materials made primarily of natural or synthetic resins, with various additives, which can be molded into specific shapes under certain temperature and pressure conditions and retain their shape at room temperature.

[0003] Existing food-grade plastic products have a layer of oil stains on their surface after processing, which needs to be cleaned after production. However, the current cleaning method usually involves wiping the surface with a towel, but the manual cleaning effect is not good. Moreover, most of the existing equipment can only clean plastic parts with relatively flat surfaces and cannot change the cleaning method according to the shape of the plastic product. For example, it cannot clean the dents in the plate. Summary of the Invention

[0004] This invention provides a cleaning device for processing plastic products, which has the beneficial effect of diverse cleaning operations. It solves the problem mentioned in the background art that existing food-grade plastic products have a layer of oil stains on their surface after processing, which requires cleaning after production. However, existing cleaning methods usually involve wiping the surface with a towel, but manual cleaning is not very effective. Moreover, most existing equipment can only clean plastic parts with high flatness and cannot change the cleaning method according to the shape of the plastic product. For example, it cannot clean the dents in the plate.

[0005] The present invention provides the following technical solution: a cleaning device for processing plastic products, comprising a frame and an internal truss within the frame, wherein a pressure belt is rotatably mounted on the upper end of the frame, and support shafts are symmetrically mounted on both ends of the inner wall of the pressure belt; the internal truss is arranged horizontally inside the frame, and lifting rods are arranged on the upper surface of each internal truss; a cleaning conveyor belt is slidably mounted on the upper end of the lifting rod, and a negative pressure belt is also slidably mounted on the upper end of the lifting rod;

[0006] The lifting rod includes a support sleeve, a lifting rod, a connecting end, a movable head, and a support roller. The upper surface of the built-in truss is arranged with support sleeves. The lifting rod is movably installed inside the support sleeve. The top end of the lifting rod is provided with a connecting end. The upper end of the connecting end is rotatably installed with a movable head. The top end of the movable head is symmetrically installed with support rollers. The support rollers are used to support the cleaning conveyor belt and the negative pressure belt.

[0007] The cleaning conveyor belt includes a cleaning belt, a movable guide rail groove, a limiting slide groove, and a liquid storage tank. The bottom end of the inner wall of the cleaning belt is symmetrically provided with movable guide rail grooves, and the two sides of the inner wall of the cleaning belt are provided with limiting slide grooves. The inner wall of the limiting slide groove is provided with a liquid storage tank, and the liquid storage tank is filled with oil.

[0008] The internal structure of the cleaning belt and the negative pressure belt is the same. The negative pressure belt and the cleaning belt are installed alternately on the upper end of the support roller. Both the negative pressure belt and the cleaning belt are made of rubber.

[0009] As an optional solution of the cleaning device for processing plastic products according to the present invention, wherein: an elastic telescopic shaft is fixedly installed inside the lower pressure belt, a limiting plate is fixedly installed at the bottom end of the elastic telescopic shaft, the lower surface of the limiting plate is used to fit against the upper surface of the inner wall of the lower pressure belt, and the limiting plate is used to keep the lower surface of the lower pressure belt in a trapezoidal state;

[0010] Both the negative pressure belt and the cleaning belt slide on the upper surface of the support roller;

[0011] The lifting rod is equipped with a damping rod inside. The damping rod includes a central vertical rod, a beveled edge, a friction end, and a first spring. The central vertical rod is slidably installed inside the lifting rod. Beveled edges are installed on both sides of the central vertical rod. The bottom of the central vertical rod is fixedly installed to the upper surface of the built-in truss.

[0012] Friction ends are symmetrically installed at the bottom end of the inner wall of the lifting rod. The friction ends are used to fit against one side of the inclined side. A first spring is fixedly installed at the bottom end of the lifting rod. The top end of the first spring contacts the lower surface of the lifting rod. The first spring is used to provide the lifting force of the lifting rod.

[0013] The friction end is used to increase the sliding friction of the central vertical rod;

[0014] The cleaning belt is equipped with a cleaning frame, which includes a rotating disc, brush bristles, a sponge, a shrink cover, a separating net, and a fixing side ring. The rotating disc is rotatably installed inside the cleaning belt. The upper surface of the rotating disc is densely arranged with brush bristles. The rotating disc has an inner cavity, and a sponge is installed inside the inner cavity. A fixing side ring is fixedly installed on the outside of the sponge.

[0015] The upper surface of the rotating disc is also equipped with a shrink cover, the top of which is provided with an isolation net. The lower end of the fixed side ring is equipped with a lifting spring. Traction belts are arranged on one side of both the cleaning belt and the negative pressure belt. The traction belts are used to connect two adjacent negative pressure belts and the cleaning belt. The traction belts are used to connect the two sides of two adjacent negative pressure belts and the cleaning belt, and to ensure that the heights of the negative pressure belt and the cleaning belt tend to be balanced.

[0016] As an optional solution of the cleaning device for processing plastic products according to the present invention, the cleaning rack further includes a spiral groove, a guide hole, a limiting arc edge and a spiral guide tube, the inner wall of the rotating disk is also provided with a spiral groove, the top end of the spiral groove is provided with a guide hole located in the rotating disk, and the guide hole communicates with the inner cavity;

[0017] The lower surface of the rotating disk has three limiting arc edges arranged in a ring. The lower surface of the rotating disk is also provided with a spiral guide tube. The top end of the spiral guide tube is connected to the lower end of the spiral groove. The spiral guide tube has a spiral structure. The rubber connecting belt inside the cleaning belt has a drive rack on its upper surface. The lower surface of the rotating disk is provided with a bottom gear. The bottom gear and the drive rack are used to provide the rotational power of the rotating disk.

[0018] As an optional embodiment of the cleaning device for processing plastic products according to the present invention, wherein: a sealing movable plate is further installed inside the cleaning belt, the sealing movable plate includes a rubber connecting belt, a rubber sliding shaft, a sealing strip and a connecting block, the rubber connecting belt is installed inside the cleaning belt, and rubber sliding shafts are provided at both ends of the rubber connecting belt;

[0019] The rubber slide shaft is used to seal and slide inside the limiting slide groove. The outer surface of the rubber slide shaft is arranged with sealing strips, and a connecting block is fixedly installed inside the rubber slide shaft. The sealing strips are used to increase the sealing effect of the rubber slide shaft in the limiting slide groove.

[0020] The upper surface of the rubber connecting strip is sealed to the internal space of the cleaning strip.

[0021] As an optional solution of the cleaning device for processing plastic products according to the present invention, the sealing movable plate further includes a limiting sleeve and a connecting bead. The limiting sleeve is fixedly installed inside the connecting block, and a connecting bead is provided at one end of the connecting block. The connecting bead is used to be movably installed inside the limiting sleeve.

[0022] The connecting bead is connected to the limiting sleeve to provide the combined function of connecting the beginning and end of the connecting block. The connecting block is used to provide the limiting and supporting function when the rubber slide shaft is in a bent state.

[0023] The lower surface of the rubber slide shaft is provided with a liquid guide tube, which provides liquid transportation when it is located at the lower end of the cleaning belt;

[0024] Both sides of the inner wall of the negative pressure belt and the cleaning belt are equipped with elastic telescopic rods, which are used to provide expansion and contraction compensation for the negative pressure belt and the cleaning belt.

[0025] As an optional embodiment of the cleaning device for processing plastic products according to the present invention, wherein: a negative pressure suction component is installed inside the negative pressure belt, the negative pressure suction component includes a negative pressure suction frame, absorbent cotton and vent holes, the negative pressure suction frame is movably installed inside the negative pressure belt, absorbent cotton is installed inside the negative pressure suction frame, vent holes are densely arranged inside the absorbent cotton, and the absorbent cotton is a composite cotton core material.

[0026] As an optional solution of the cleaning device for processing plastic products according to the present invention, the negative pressure suction component further includes an upper plate, a lower plate, a push-opening crossbar and a second spring. The bottom surface of the inner wall of the negative pressure suction frame is provided with an upper plate, the lower surface of the upper plate is fixedly provided with a lower plate located inside the negative pressure suction frame, and the lower surface of the lower plate is also provided with a push-opening crossbar located inside the inner wall of the negative pressure suction frame.

[0027] The lower surface of the upper plate is used to seal and adhere to the upper surface of the lower plate;

[0028] The negative pressure suction frame is equipped with second springs on both sides, and the second springs are used to provide the lifting force of the negative pressure suction frame;

[0029] The liquid guide tube provides negative pressure suction when it is located at the lower end of the negative pressure band.

[0030] After the brush has finished cleaning, residual cleaning solution may remain on the outer surface of the plastic product. This needs to be removed, otherwise it will affect the use of the product.

[0031] As an optional embodiment of the cleaning device for processing plastic products according to the present invention, the damping rod further includes a storage cavity, a liquid guiding groove, an internal cavity, a piston push rod and a third spring, and a storage cavity is provided between the top of the central vertical rod and the interior of the lifting rod, and the inner wall of the lifting rod is also symmetrically provided with liquid guiding grooves;

[0032] The bottom end of the inner wall of the lifting rod is also provided with a built-in cavity, and the liquid guide groove is used to connect the storage cavity with the built-in cavity, and the interior of the storage cavity is filled with oil.

[0033] The built-in cavity is internally telescopically connected to a piston push rod. A friction end is fixedly installed at one end of the piston push rod. A third spring is installed between the piston push rod and the friction end. One end of the friction end is provided with a plug shaft, which is used to insert into the inside of the piston push rod and to increase the stability of the friction end.

[0034] As an optional embodiment of the cleaning device for processing plastic products according to the present invention, wherein: the lower ends of the cleaning belt and the negative pressure belt are both equipped with an outer shell located inside the equipment frame, the two sides of the outer shell are slidably equipped with limit side frames, the inside of the outer shell is symmetrically equipped with friction shafts, and the top end of the friction shaft is provided with a bevel gear;

[0035] A drive shaft is rotatably mounted inside the outer casing. Both ends of the drive shaft are meshed with two bevel gears. A reduction gearbox is provided at one end inside the outer casing. The reduction gearbox is used for meshing and transmission with the drive shaft gears.

[0036] As an optional embodiment of the cleaning device for processing plastic products according to the present invention, wherein: a cleaning fluid delivery pump is installed at one end of the equipment frame, a negative pressure pump is installed on one side of the cleaning fluid delivery pump, a liquid delivery pipe is connected to one end of the cleaning fluid delivery pump, a negative pressure pipe is connected to one end of the negative pressure pump, and both the liquid delivery pipe and the negative pressure pipe extend into the interior of the equipment frame;

[0037] Both the liquid delivery pipe and the negative pressure pipe have branched connecting pipes at one end. The branched connecting pipes are fixed to each built-in truss. Both the liquid delivery pipe and the negative pressure pipe have a set of branched connecting pipes. Each set of branched connecting pipes is connected to a corresponding liquid guide pipe. One end of the liquid delivery pipe is connected to the liquid guide pipe at the lower end of the cleaning belt, and one end of the negative pressure pipe is connected to the liquid guide pipe at the lower end of the negative pressure belt.

[0038] The present invention has the following beneficial effects:

[0039] 1. The cleaning device for processing plastic products utilizes the extensibility of the cleaning belt, which, when raised, contacts the lower surface of the plastic product and changes its own structure according to its shape and structure to achieve adhesion.

[0040] Furthermore, through the function of the cleaning rack, it can provide cleaning solution when cleaning plastic products, and through the sliding of the cleaning belt, it can provide the brush bristles with friction cleaning action on the plastic products. In addition, the rotation of the disc increases the diversity of the brush bristles' friction cleaning action and improves the cleaning effect on plastic products. Compared with conventional structures, it greatly increases the convenience of cleaning.

[0041] 2. This cleaning device for processing plastic products can process cleaning fluid through the action of a negative pressure belt. It uses absorbent cotton to absorb the cleaning fluid for the first time, and then releases the seal between the upper and lower plates by pressing the absorbent cotton into contact with the plastic product, thereby achieving the effect of negative pressure suction. While suctioning the cleaning fluid, it can also suction the moisture inside the absorbent cotton, thus completing the suction operation of the cleaning fluid.

[0042] Furthermore, the negative pressure suction can only be triggered when the negative pressure suction frame is subjected to downward pressure, while at other times it remains closed. This operation ensures that the strength of the negative pressure suction is only activated during operation. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0044] Figure 2 This is a schematic diagram of the overall side structure of the present invention.

[0045] Figure 3 For the present invention Figure 1 A schematic diagram of the local structure at point A.

[0046] Figure 4 This is a schematic diagram of the connection structure between the cleaning conveyor belt and the sealing movable plate of the present invention.

[0047] Figure 5 This is a schematic diagram of the cleaning rack structure of the present invention.

[0048] Figure 6 This is a schematic diagram of the negative pressure belt structure of the present invention.

[0049] Figure 7 This is a schematic diagram of the connecting block structure of the present invention.

[0050] Figure 8 This is a schematic diagram of the internal structure of the lifting rod of the present invention.

[0051] Figure 9 This is a schematic diagram of the internal structure of the outer shell of the present invention.

[0052] Figure 10 This is a schematic diagram showing the bonding state between the cleaning belt of the present invention and a plastic product.

[0053] Figure 11 For the present invention Figure 5 The diagram shows the local structure at point B.

[0054] Figure 12 For the present invention Figure 1 The diagram shows the local structure at point C.

[0055] In the diagram: 1. Equipment frame; 2. Lifting rod; 21. Support sleeve; 22. Lifting rod; 23. Connecting end; 24. Moving head; 25. Support roller; 26. Traction belt;

[0056] 3. Cleaning conveyor belt; 31. Washing belt; 32. Movable guide rail groove; 33. Limiting slide groove; 34. Liquid storage tank;

[0057] 4. Sealing movable plate; 41. Rubber connecting strip; 42. Rubber sliding shaft; 43. Sealing strip; 44. Connecting block; 45. Connecting bead; 46. Limiting sleeve; 48. Liquid guide tube;

[0058] 5. Damping rod; 51. Central vertical rod; 52. Sloping edge; 53. Friction end; 54. Storage cavity; 55. Liquid guide groove; 56. Internal cavity; 57. Piston push rod; 58. First spring;

[0059] 6. Negative pressure suction component; 61. Negative pressure suction frame; 62. Absorbent cotton; 63. Ventilation holes; 64. Upper plate; 65. Lower plate; 66. Top opening crossbar; 67. Second spring;

[0060] 71. Negative pressure belt;

[0061] 8. Washing rack; 80. Spiral guide tube; 81. Spinning plate; 82. Brush bristles; 83. Sponge; 84. Shrink cover; 85. Isolation net; 86. Fixing side ring; 87. Spiral groove; 88. Guide hole; 89. Limiting arc edge;

[0062] 91. Outer casing; 92. Limiting side bracket; 93. Friction shaft; 94. Bevel gear; 95. Drive shaft; 96. Gearbox; 97. Bottom gear; 98. Drive rack;

[0063] 10. Elastic telescopic rod; 11. Cleaning fluid delivery pump; 12. Negative pressure pump; 13. Liquid delivery pipe; 14. Negative pressure pipe; 15. Branching connection pipe; 16. Pressure belt; 17. Limiting plate; 18. Elastic telescopic shaft; 19. Support shaft; 20. Built-in truss. Detailed Implementation

[0064] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0065] Example 1

[0066] Please see Figures 1-10 One of the cleaning devices for processing plastic products includes a frame 1 and an internal truss 20 inside the frame 1. A pressure belt 16 is rotatably installed on the upper end of the frame 1. Support shafts 19 are symmetrically installed at both ends of the inner wall of the pressure belt 16. The internal trusses 20 are arranged horizontally inside the frame 1. Lifting rods 2 are arranged on the upper surface of each internal truss 20. A cleaning conveyor belt 3 is slidably installed on the upper end of the lifting rod 2. A negative pressure belt 71 is also slidably installed on the upper end of the lifting rod 2.

[0067] The lifting rod 2 includes a support sleeve 21, a lifting rod 22, a connecting end 23, a movable head 24, and a support roller 25. The support sleeve 21 is arranged on the upper surface of the built-in truss 20. The lifting rod 22 is movably installed inside the support sleeve 21. The top end of the lifting rod 22 is provided with a connecting end 23. The upper end of the connecting end 23 is rotatably installed with a movable head 24. The top end of the movable head 24 is symmetrically installed with support rollers 25. The support rollers 25 are used to support the cleaning conveyor belt 3 and the negative pressure belt 71.

[0068] The connecting end 23 is rotatably connected to the movable head 24, and a torsion spring is provided at both the connecting end 23 and the movable head 24. This design... It is used to ensure that the upper surface of the negative pressure belt 71 or the cleaning belt 31 can adapt to the inclined surface when in contact with plastic products. The angle is adjusted according to the inclined surface, and the negative pressure belt 71 and the cleaning belt 31 are supported by the support roller 25. The support roller 25 is positioned inside the negative pressure belt 71 and the cleaning belt 3 to prevent instability. ;

[0069] The cleaning conveyor belt 3 includes a cleaning belt 31, a movable guide groove 32, a limiting slide groove 33, and a liquid storage tank 34. The movable guide groove 32 is symmetrically provided at the bottom of the inner wall of the cleaning belt 31. The limiting slide groove 33 is provided on both sides of the inner wall of the cleaning belt 31. The liquid storage tank 34 is provided on the inner wall of the limiting slide groove 33. The liquid storage tank 34 is filled with oil.

[0070] The internal structure of the cleaning belt 31 and the negative pressure belt 71 is the same. The negative pressure belt 71 and the cleaning belt 31 are installed alternately on the upper end of the support roller 25. Both the negative pressure belt 71 and the cleaning belt 31 are made of rubber.

[0071] An elastic telescopic shaft 18 is fixedly installed inside the pressure belt 16. A limiting plate 17 is fixedly installed at the bottom end of the elastic telescopic shaft 18. The lower surface of the limiting plate 17 is used to fit against the upper surface of the inner wall of the pressure belt 16. The limiting plate 17 is used to keep the lower surface of the pressure belt 16 in a trapezoidal state.

[0072] Both the negative pressure belt 71 and the cleaning belt 31 slide on the upper surface of the support sleeve 21;

[0073] The lifting rod 22 is equipped with a damping rod 5. The damping rod 5 includes a central vertical rod 51, a sloped side 52, a friction end 53, and a first spring 58. The central vertical rod 51 is slidably installed inside the lifting rod 22. Sloping sides 52 are installed on both sides of the central vertical rod 51. The bottom of the central vertical rod 51 is fixedly installed to the upper surface of the built-in truss 20.

[0074] Friction ends 53 are symmetrically installed at the bottom of the inner wall of the lifting rod 22. The friction ends 53 are used to fit against one side of the inclined edge 52. A first spring 58 is fixedly installed at the bottom of the lifting rod 22.

[0075] The friction end 53 is used to increase the sliding friction of the central vertical rod 51;

[0076] The cleaning belt 31 is equipped with a cleaning frame 8. The cleaning frame 8 includes a rotating disc 81, brush bristles 82, sponge 83, shrink cover 84, isolation net 85 and fixed side ring 86. The rotating disc 81 is rotatably installed inside the cleaning belt 31. The upper surface of the rotating disc 81 is densely arranged with brush bristles 82. The rotating disc 81 has an inner cavity. The inner cavity is equipped with a sponge 83. The outer side of the sponge 83 is fixedly installed with a fixed side ring 86.

[0077] A shrink cover 84 is also installed on the upper surface of the rotating disc 81. An isolation net 85 is provided at the top of the shrink cover 84. A lifting spring is installed at the lower end of the fixed side ring 86. Traction belts 26 are arranged on one side of the cleaning belt 31 and the negative pressure belt 71. The traction belts 26 are used to connect two adjacent negative pressure belts 71 and the cleaning belt 31. The traction belts 26 are used to connect the two sides of the two adjacent negative pressure belts 71 and the cleaning belt 31, and to ensure that the height of the negative pressure belt 71 and the cleaning belt 31 tends to be balanced.

[0078] The cleaning rack 8 also includes a spiral groove 87, a guide hole 88, a limiting arc edge 89, and a spiral guide tube 80. The inner wall of the rotating disk 81 is also provided with a spiral groove 87, and the top of the spiral groove 87 is provided with a guide hole 88 located in the rotating disk 81. The guide hole 88 communicates with the inner cavity.

[0079] The lower surface of the rotary disk 81 has three limiting arc edges 89 arranged in a ring array. The lower surface of the rotary disk 81 is also provided with a spiral guide tube 80, a rubber connecting strip 41 inside the cleaning belt 31, a drive rack 98 on its upper surface, and a bottom gear 97 on the lower surface of the rotary disk 81. The bottom gear 97 and the drive rack 98 are used to provide the rotational power of the rotary disk 81.

[0080] The cleaning belt 31 is also equipped with a sealing movable plate 4. The sealing movable plate 4 includes a rubber connecting belt 41, a rubber sliding shaft 42, a sealing strip 43 and a connecting block 44. The cleaning belt 31 is equipped with a rubber connecting belt 41, and the two ends of the rubber connecting belt 41 are provided with rubber sliding shafts 42.

[0081] The rubber slide shaft 42 is used to seal and slide inside the limiting slide groove 33. The outer surface of the rubber slide shaft 42 is arranged with sealing strips 43. A connecting block 44 is fixedly installed inside the rubber slide shaft 42. The sealing strips 43 are used to increase the sealing effect of the rubber slide shaft 42 in the limiting slide groove 33.

[0082] The upper surface of the rubber connecting belt 41 is sealed to the internal space of the cleaning belt 31;

[0083] The sealing movable plate 4 also includes a limiting sleeve 46 and a connecting bead 45. The limiting sleeve 46 is fixedly installed inside the connecting block 44, and a connecting bead 45 is provided at one end of the connecting block 44. The connecting bead 45 is used to be movably installed inside the limiting sleeve 46.

[0084] The connecting bead 45 is connected to the limiting sleeve 46 to provide the combined function of connecting the beginning and end of the connecting block 44. The connecting block 44 is used to provide the limiting and supporting function when the rubber slide shaft 42 is in the bent state.

[0085] The lower surface of the rubber slide shaft 42 is provided with a liquid guide tube 48, which provides liquid transportation when it is located at the lower end of the cleaning belt 31.

[0086] Both sides of the inner wall of the negative pressure belt 71 and the cleaning belt 31 are equipped with elastic telescopic rods 10, which are used to provide expansion and contraction compensation for the negative pressure belt 71 and the cleaning belt 31.

[0087] When in use, the plastic product needs to be placed on the upper surface of one end of the equipment frame 1. The plastic product is brought into the upper surface of the cleaning belt 31 and the negative pressure belt 71 by the rotation of the pressure belt 16 and continues to move. The plastic product is pushed down by the pressure action of the limit plate 17.

[0088] according to Figure 10 As shown, as the pressure belt 16 moves and provides downward pressure, the upper surfaces of the cleaning belt 31 and the negative pressure belt 71 come close to the lower surface of the plastic product. At this time, the first spring 58 provides lifting force, which pushes the lifting rod 22 upward. The lifting rod 22 then pushes the negative pressure belt 71 and the cleaning belt 31 upward, and forms a counterforce with the downward pressure of the plastic product. This makes the upper surfaces of the cleaning belt 31 and the negative pressure belt 71 adapt to the grooves on the lower surface of the plastic product, and automatically fit the lower surface of the plastic product according to the cross-sectional shape of the plastic product. This allows the negative pressure belt 71 and the cleaning belt 31 to change their shape according to the shape of the plastic product and fit with it to complete the contact state.

[0089] The cleaning fluid is delivered to the upper surface space of the rubber connecting belt 41 through the liquid guide pipe 48 connected to the conveying equipment. At this time, the sponge 83 is located inside the shrink cover 84. Through the material of the sponge 83, when the cleaning fluid comes into contact with the sponge 83, it will be absorbed by the sponge 83. When the cleaning belt 31 rises and comes into contact with the lower surface of the plastic part, it will squeeze the shrink cover 84 and squeeze out the cleaning fluid inside the sponge 83, which will flow into the interior of the surrounding bristles 82. There are also pores on the side of the shrink cover 84, through which the cleaning fluid can also flow out from the side of the shrink cover 84. Finally, the cleaning belt 31 drives the entire rotating disc 81, so that the bristles 82 contact and clean the lower surface of the plastic product.

[0090] At this time, the cleaning belt 31 slides laterally on the upper surface of the support roller 25. While sliding, the bottom gear 97 meshes with the drive rack 98 to provide rotational power to the rotating disk 81. The sliding of the cleaning belt 31 provides the brush bristles 82 with friction cleaning action on plastic products, and increases the rotation of the rotating disk 81, increasing the diversity of the friction cleaning action of the brush bristles 82 and improving the cleaning effect on plastic products. At the same time, the rotation of the rotating disk 81 can make the limiting arc edge 89 gather the cleaning liquid towards the axis of the rotating disk 81. Meanwhile, the spiral guide tube 80 will perform a scooping action and send the cleaning liquid along the inside of the spiral guide tube 80 into the inside of the spiral groove 87 through rotational force, and finally fall into the inside of the sponge 83. This increases the amount of cleaning liquid discharged into the inside of the sponge 83 and avoids the upper part of the sponge from being unable to absorb the cleaning liquid, resulting in insufficient absorption.

[0091] When the plastic product is attached to the upper surface of the negative pressure belt 71 and the cleaning belt 31, the continuous pressing and pushing of the pressing belt 16 causes the plastic product to slide on the upper surface of the negative pressure belt 71 and the cleaning belt 31. When one end of the plastic product in the forward direction presses on the upper surface of the first cleaning belt 31, the traction belt 26 links the cleaning belt 31 and the negative pressure belt 71. When the first cleaning belt 31 is pressed down, the subsequent cleaning belt 31 or negative pressure belt 71 will decrease in height as pulled by the traction belt 26. As it moves, the end of the plastic product will press the traction belt 26 down, causing the plastic product to move along the traction belt 26 to the upper surface of the next cleaning belt 31 or negative pressure belt 71, thus completing the sliding effect of the plastic product on the upper surface of the cleaning belt 31 and the negative pressure belt 71.

[0092] The device utilizes the extensibility of the cleaning belt 31, allowing it to contact the lower surface of the plastic product when it is raised, and to change its own structure according to the shape and structure of the product to achieve a fit.

[0093] Furthermore, through the function of the cleaning rack 8, it can provide cleaning fluid when cleaning plastic products, and through the sliding of the cleaning belt 31, it can provide the brush bristles 82 with friction cleaning action on the plastic products, and increase the rotation of the rotating disc 81, increase the diversity of the friction cleaning action of the brush bristles 82, and improve the cleaning effect on plastic products. Compared with the conventional structure, it greatly increases the convenience of cleaning.

[0094] Example 2

[0095] This embodiment is an improvement upon embodiment 1. For details, please refer to [link / reference]. Figures 1-10The negative pressure belt 71 is equipped with a negative pressure suction component 6. The negative pressure suction component 6 includes a negative pressure suction frame 61, absorbent cotton 62 and vent holes 63. The negative pressure suction frame 61 is movably installed inside the negative pressure belt 71. The absorbent cotton 62 is installed inside the negative pressure suction frame 61. The absorbent cotton 62 has densely arranged vent holes 63 inside, and the absorbent cotton 62 is made of composite cotton core material.

[0096] The negative pressure suction component 6 also includes an upper plate 64, a lower plate 65, a push-open crossbar 66, and a second spring 67. The bottom surface of the inner wall of the negative pressure suction frame 61 is provided with an upper plate 64. The lower surface of the upper plate 64 is fixedly provided with a lower plate 65 located inside the negative pressure suction frame 61. The lower surface of the lower plate 65 is also provided with a push-open crossbar 66 located inside the inner wall of the negative pressure suction frame 61.

[0097] The lower surface of the upper plate 64 is used to seal and adhere to the upper surface of the lower plate 65;

[0098] Second springs 67 are installed on both sides of the negative pressure suction frame 61. The second springs 67 are used to provide the lifting force of the negative pressure suction frame 61.

[0099] When the liquid guide tube 48 is located at the lower end of the negative pressure band 71, it provides negative pressure suction.

[0100] After the bristles 82 complete the cleaning task, residual cleaning solution will remain on the outer surface of the plastic products. This needs to be removed, otherwise it will affect the use of the product.

[0101] When the plastic product is attached to the upper surface of the cleaning belt 31 and the negative pressure belt 71, it is connected to the negative pressure equipment through the liquid guide pipe 48 below the negative pressure belt 71, providing negative pressure suction to the space above the rubber connecting belt 41. When the upper surface of the absorbent cotton 62 is attached to the plastic product, the material properties of the absorbent cotton 62 will absorb the cleaning liquid after contact, and at the same time, it will press down the negative pressure suction frame 61. After being pressed down to the position of the top opening crossbar 66, the top opening crossbar 66 will lift up the upper plate 64, releasing the sealing state between the upper plate 64 and the lower plate 65, so that the negative pressure force will absorb the absorbent cotton 62. At the same time, the surface of the plastic product is vented through the vent 63. The suction process draws the cleaning fluid into the interior, causing the negative pressure belt 71 to move laterally, which in turn moves the absorbent cotton 62, creating a scraping motion. Utilizing the material properties of the absorbent cotton 62, the cleaning fluid is directly absorbed. Then, the negative pressure suction provided by the liquid guide tube 48, through the vent 63, further suctions the outer surface of the plastic product. These two operating methods work together to directly remove residual cleaning fluid. The negative pressure suction is only triggered when the negative pressure suction frame 61 is subjected to downward pressure; at other times, it remains closed. This operation ensures the strength of the negative pressure suction, which is only activated during operation.

[0102] The negative pressure suction component 6 enables the cleaning fluid to be processed. The absorbent cotton 62 is used to absorb the cleaning fluid initially. Then, the absorbent cotton 62 is pressed into contact with the plastic product to release the seal between the upper plate 64 and the lower plate 65, thus achieving the effect of negative pressure suction. While the cleaning fluid is being sucked out, the moisture inside the absorbent cotton 62 is also being sucked out, completing the suction operation of the cleaning fluid.

[0103] Example 3

[0104] This embodiment is an improvement upon embodiment 2. For details, please refer to [link / reference]. Figures 1-10 The damping rod 5 also includes a storage cavity 54, a liquid guide groove 55, an internal cavity 56, a piston push rod 57 and a third spring. The storage cavity 54 is provided between the top of the central vertical rod 51 and the interior of the lifting rod 22. The inner wall of the lifting rod 22 is also symmetrically provided with liquid guide grooves 55.

[0105] The bottom of the inner wall of the lifting rod 22 is also provided with a built-in cavity 56. The liquid guide groove 55 is used to connect the storage cavity 54 with the built-in cavity 56, and the inside of the storage cavity 54 is filled with oil.

[0106] The internal cavity 56 is telescopically connected to a piston push rod 57. A friction end 53 is fixedly installed at one end of the piston push rod 57. A third spring is installed between the piston push rod 57 and the friction end 53. One end of the friction end 53 is provided with a plug shaft. The plug shaft is used to plug into the inside of the piston push rod 57. The plug shaft is used to increase the stability of the friction end 53.

[0107] The lower ends of the cleaning belt 31 and the negative pressure belt 71 are both equipped with a housing 91 located inside the equipment frame 1. Limiting side frames 92 are slidably installed on both sides of the housing 91. Friction shafts 93 are symmetrically installed inside the housing 91. A bevel gear 94 is provided at the top of the friction shaft 93.

[0108] Inside the outer casing 91, a drive shaft 95 is rotatably mounted. Both ends of the drive shaft 95 are meshed with the top teeth of two friction shafts 93. One end inside the outer casing 91 is provided with a reduction gearbox 96, which is used for gear meshing and transmission with the drive shaft 95.

[0109] A cleaning fluid delivery pump 11 is installed at one end of the equipment frame 1, and a negative pressure pump 12 is installed on one side of the cleaning fluid delivery pump 11. A liquid delivery pipe 13 is connected to one end of the cleaning fluid delivery pump 11, and a negative pressure pipe 14 is connected to one end of the negative pressure pump 12. Both the liquid delivery pipe 13 and the negative pressure pipe 14 extend into the interior of the equipment frame 1.

[0110] Both the liquid delivery pipe 13 and the negative pressure pipe 14 have branched connecting pipes 15 arranged at one end. The branched connecting pipes 15 are fixed to each built-in truss 20. Both the liquid delivery pipe 13 and the negative pressure pipe 14 have a set of branched connecting pipes 15 arranged. Each set of branched connecting pipes 15 is connected to the liquid guide pipe 48. One end of the liquid delivery pipe 13 is connected to the liquid guide pipe 48 at the lower end of the cleaning belt 31, and one end of the negative pressure pipe 14 is connected to the liquid guide pipe 48 at the lower end of the negative pressure belt 71.

[0111] If the rebound speed is too fast when the cleaning belt 31 and the negative pressure belt 71 rebound, it will cause the surface of the next plastic product to be bumped and affected, thus affecting the surface quality.

[0112] The negative pressure pump 12 provides negative pressure suction and is connected to the liquid guide pipe 48 below each negative pressure belt 71 through the bifurcated connecting pipe 15 at one end of the negative pressure pipe 14. Following the same steps, the bifurcated connecting pipe 15 at one end of the liquid delivery pipe 13 is connected to the liquid guide pipe 48 below each cleaning belt 31. One end of the friction end 53 is provided with a plug shaft, which is used to increase the stability of the friction end 53.

[0113] During the rebound, the third spring provides elastic thrust, causing the lifting rod 22 to rise and form relative motion with the central vertical rod 51. Simultaneously, it rubs against the inclined side 52 through the friction end 53. The inclined structure of the inclined side 52 means that the higher the lifting rod 22 rebounds, the greater the friction between the friction end 53 and the inclined side 52, and thus the greater the resistance. This operation increases the resistance of the lifting rod 22 during the initial rebound, preventing the frictional resistance between the friction end 53 and the inclined side 52 from being too small to limit the rebound force during the initial rebound. It also slows down the speed of the lifting rod 22 when it rises, avoiding the possibility of collision with plastic products. Furthermore, the internal cavity 56 has air holes to allow normal air circulation on both sides of the internal cavity 56.

[0114] Through the linkage structure between the inside of the gearbox 96 and the lower plate 65, during operation, the drive shaft 95 drives the friction shaft 93 to rotate. The two friction shafts 93 clamp the cleaning belt 31 or the negative pressure belt 71 inside and provide sliding power support for the cleaning belt 31 and the negative pressure belt 71. At the same time, when the plastic product is subjected to downward pressure, causing the cleaning belt 31 and the negative pressure belt 71 to embed into its internal groove, the bottom of the cleaning belt 31 and the negative pressure belt 71 will compensately retract, thereby driving the outer shell 91 to rise. It is limited by the limiting side frame 92, so that the outer shell 91 can only rise according to the position of the limiting side frame 92, so that it can maintain the power output to the cleaning belt 31 and the negative pressure belt 71 while rising.

[0115] The cleaning belt 31 and negative pressure belt 71 are normally rectangular, and their total length remains constant. When their upper surfaces contact the lower surface of the plastic product, if the lower surface of the plastic product has a pit, a height difference will be created when the cleaning belt 31 and negative pressure belt 71 are in contact with it. This height difference increases the usable length of the cleaning belt 31 and negative pressure belt 71. In this case, the lower ends of the cleaning belt 31 and negative pressure belt 71 will be pulled upwards to compensate for the required length when in contact with the plastic product, and to cause the elastic telescopic rod 10 to retract. The outer shell 91 then... The cleaning belt 31 and the negative pressure belt 71 are sandwiched within it. When the lower ends of the cleaning belt 31 and the negative pressure belt 71 retract, they will cause belt 91 to rise together. It should be noted that crossbars are provided at the two corners of the upper cleaning belt 31 to support and position the corners of the cleaning belt 31. Secondly, only the uppermost horizontal rubber connecting belt 41 is provided with a drive rack 98, and both the rubber connecting belt 41 and the drive rack 98 are made of rubber and have a certain degree of elasticity. At the same time, the bottom gear 97 has a small diameter, and when the uppermost horizontal rubber connecting belt 41 and the drive rack 98 are bent by the shape of the plastic product (such as... Figure 10 At this time, because the bottom gear 97 has a small diameter, and the bending angle of the rubber connecting belt 41 and the drive rack 98 is relatively small, the drive rack 98 can also undergo a certain deformation, so that the bottom gear 97 can pass through normally, effectively avoiding jamming.

[0116] And located in Figure 6 The rubber connecting belt 41 at the corner of the connecting block 44 does not have a drive rack 98. Instead, the cleaning belt 31 moves back and forth on the rubber connecting belt 41 through the reciprocating motion of the subsequent friction shaft 93, thus polishing the plastic product. In order to avoid the polishing part shifting left and right on the cleaning belt 31, those skilled in the art can use a clamping and positioning device to position the plastic product during the polishing process. The clamping and positioning device is existing technology and can be a clamping robotic arm. Those skilled in the art can select it according to actual needs.

[0117] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0118] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A cleaning device for processing plastic products, comprising a frame (1) and an internal truss (20) within the frame (1), wherein a pressure belt (16) is rotatably mounted on the upper end of the frame (1), and support shafts (19) are symmetrically mounted on both ends of the inner wall of the pressure belt (16), characterized in that: The equipment rack (1) has internal trusses (20) arranged horizontally inside, and each internal truss (20) has lifting rods (2) arranged on its upper surface. The lifting rod (2) includes a support sleeve (21), a lifting rod (22), a connecting end (23), a movable head (24), and a support roller (25). The upper surface of the built-in truss (20) is provided with support sleeves (21). The lifting rod (22) is movably installed inside the support sleeve (21). The top end of the lifting rod (22) is provided with a connecting end (23). The upper end of the connecting end (23) is rotatably installed with a movable head (24). The top end of the movable head (24) is symmetrically installed with support rollers (25). The cleaning conveyor belt (3) includes a cleaning belt (31), a movable guide rail groove (32), a limiting slide groove (33), and a liquid storage tank (34). The bottom end of the inner wall of the cleaning belt (31) is symmetrically provided with the movable guide rail groove (32). The two sides of the inner wall of the cleaning belt (31) are provided with the limiting slide groove (33). The inner wall of the limiting slide groove (33) is provided with the liquid storage tank (34). The liquid storage tank (34) is filled with oil. The internal structure of the cleaning belt (31) and the negative pressure belt (71) is the same. The negative pressure belt (71) and the cleaning belt (31) are installed alternately on the upper end of the support roller (25). Both the negative pressure belt (71) and the cleaning belt (31) are made of rubber. The cleaning belt (31) is equipped with a cleaning frame (8), which includes a rotating disc (81), bristles (82), a sponge (83), a shrink cover (84), a mesh screen (85), and a fixed side ring (86). The rotating disc (81) is rotatably installed inside the cleaning belt (31). The upper surface of the rotating disc (81) is densely covered with bristles (82). The rotating disc (81) has an inner cavity, and a sponge (83) is installed inside the inner cavity. A fixed side ring (86) is fixedly installed on the outer side of the sponge (83). The upper surface of the rotating disc (81) is also equipped with a shrink cover (84), and the top of the shrink cover (84) is provided with an isolation net (85). The lower end of the fixed side ring (86) is equipped with a lifting spring. Traction belts (26) are arranged on one side of the cleaning belt (31) and the negative pressure belt (71). The traction belts (26) are used to connect the adjacent negative pressure belts (71) and the cleaning belt (31). The traction belts (26) are used to connect the two sides of the adjacent negative pressure belts (71) and the cleaning belt (31), and to ensure that the height of the negative pressure belts (71) and the cleaning belts (31) tends to be balanced. The cleaning rack (8) also includes a spiral groove (87), a guide hole (88), a limiting arc edge (89), and a spiral guide tube (80). The inner wall of the rotating disk (81) is also provided with a spiral groove (87). The top of the spiral groove (87) is provided with a guide hole (88) located in the rotating disk (81). The guide hole (88) communicates with the inner cavity. The lower surface of the rotary disc (81) has three limiting arc edges (89) arranged in a ring. The lower surface of the rotary disc (81) is also provided with a spiral guide (80). The top end of the spiral guide (80) is connected to the lower end of the spiral groove (87). The spiral guide (80) has a spiral structure. A rubber connecting belt (41) is slidably installed in the limiting groove (33) of the cleaning belt (31). A driving rack (98) is provided on the upper surface of the rubber connecting belt (41). A bottom gear (97) is provided on the lower surface of the rotary disc (81). The bottom gear (97) and the driving rack (98) are used to provide the rotational power of the rotary disc (81).

2. The cleaning device for processing plastic products according to claim 1, characterized in that: An elastic telescopic shaft (18) is fixedly installed inside the pressure belt (16). A limiting plate (17) is fixedly installed at the bottom end of the elastic telescopic shaft (18). The lower surface of the limiting plate (17) is used to fit against the upper surface of the inner wall of the pressure belt (16). The limiting plate (17) is used to keep the lower surface of the pressure belt (16) in a trapezoidal state. Both the negative pressure belt (71) and the cleaning belt (31) slide on the upper surface of the support roller (25); The lifting rod (22) is equipped with a damping rod (5), which includes a central vertical rod (51), a sloped side (52), a friction end (53), and a first spring (58). The central vertical rod (51) is slidably installed inside the lifting rod (22), and sloped sides (52) are installed on both sides of the central vertical rod (51). The bottom of the central vertical rod (51) is fixedly installed on the upper surface of the built-in truss (20). Friction ends (53) are symmetrically installed at the bottom of the inner wall of the lifting rod (22). The friction ends (53) are used to fit against one side of the inclined edge (52). A first spring (58) is fixedly installed at the bottom of the lifting rod (22). The top of the first spring (58) contacts the lower surface of the lifting rod (22). The first spring (58) is used to provide the lifting force for the lifting rod (22). The friction end (53) is used to increase the sliding friction of the central vertical rod (51).

3. The cleaning device for processing plastic products according to claim 2, characterized in that: The cleaning belt (31) is also equipped with a sealing movable plate (4), which includes a rubber slide shaft (42), a sealing strip (43) and a connecting block (44). The rubber connecting belt (41) is provided with rubber slide shafts (42) at both ends. The rubber slide shaft (42) is used to seal and slide inside the limiting slide groove (33). The outer surface of the rubber slide shaft (42) is arranged with sealing strips (43). A connecting block (44) is fixedly installed inside the rubber slide shaft (42). The sealing strips (43) are used to increase the sealing effect of the rubber slide shaft (42) in the limiting slide groove (33). The upper surface of the rubber connecting strip (41) is sealed to the internal space of the cleaning strip (31).

4. The cleaning device for processing plastic products according to claim 3, characterized in that: The sealing movable plate (4) also includes a limiting sleeve (46) and a connecting bead (45). The limiting sleeve (46) is fixedly installed inside the connecting block (44), and a connecting bead (45) is provided at one end of the connecting block (44). The connecting bead (45) is used to be movably installed inside the limiting sleeve (46). The connecting bead (45) is connected to the limiting sleeve (46) to provide the combined function of connecting the end of the connecting block (44). The connecting block (44) is used to provide the limiting and supporting function when the rubber slide shaft (42) is in the bent state. The lower surface of the rubber slide shaft (42) is provided with a liquid guide tube (48), which provides liquid transport when it is located at the lower end of the cleaning belt (31); Both sides of the inner wall of the negative pressure belt (71) and the cleaning belt (31) are equipped with elastic telescopic rods (10), which are used to provide expansion and contraction compensation for the negative pressure belt (71) and the cleaning belt (31).

5. The cleaning device for processing plastic products according to claim 4, characterized in that: The negative pressure belt (71) is equipped with a negative pressure suction component (6). The negative pressure suction component (6) includes a negative pressure suction frame (61), absorbent cotton (62), and vents (63). The negative pressure suction frame (61) is movably installed inside the negative pressure belt (71). The absorbent cotton (62) is installed inside the negative pressure suction frame (61). The absorbent cotton (62) has vents (63) densely arranged inside. The absorbent cotton (62) is made of composite cotton core material.

6. The cleaning apparatus for processing plastic products according to claim 5, characterized in that: The negative pressure suction component (6) also includes an upper plate (64), a lower plate (65), a push-open crossbar (66), and a second spring (67). The bottom surface of the inner wall of the negative pressure suction frame (61) is provided with an upper plate (64). The lower surface of the upper plate (64) is fixedly provided with a lower plate (65) located inside the negative pressure suction frame (61). The lower surface of the lower plate (65) is also provided with a push-open crossbar (66) located inside the inner wall of the negative pressure suction frame (61). The lower surface of the upper plate (64) is used to seal and adhere to the upper surface of the lower plate (65); The negative pressure suction frame (61) is equipped with second springs (67) on both sides, and the second springs (67) are used to provide the lifting force of the negative pressure suction frame (61); The liquid guide tube (48) provides negative pressure suction when it is located at the lower end of the negative pressure band (71); After the bristles (82) have completed the cleaning task, residual cleaning liquid will adhere to the outer surface of the plastic product. It needs to be removed, otherwise it will affect the use of the product.

7. The cleaning apparatus for processing plastic products according to claim 6, characterized in that: The damping rod (5) also includes a storage cavity (54), a liquid guide groove (55), an internal cavity (56), a piston push rod (57) and a third spring. The top of the central vertical rod (51) is provided with a storage cavity (54) between it and the interior of the lifting rod (22). The inner wall of the lifting rod (22) is also symmetrically provided with liquid guide grooves (55). The bottom end of the inner wall of the lifting rod (22) is also provided with a built-in cavity (56), and the liquid guide groove (55) is used to connect the storage cavity (54) with the built-in cavity (56), and the inside of the storage cavity (54) is filled with oil. The built-in cavity (56) is internally telescopically connected to a piston push rod (57). A friction end (53) is fixedly installed at one end of the piston push rod (57). A third spring is installed between the piston push rod (57) and the friction end (53). One end of the friction end (53) is provided with a plug shaft. The plug shaft is used to plug into the inside of the piston push rod (57). The plug shaft is used to increase the stability of the friction end (53).

8. The cleaning apparatus for processing plastic products according to claim 7, characterized in that: The lower ends of the cleaning belt (31) and the negative pressure belt (71) are both equipped with a housing (91) located inside the equipment frame (1). Limiting side frames (92) are slidably installed on both sides of the housing (91). Friction shafts (93) are symmetrically installed inside the housing (91). A bevel gear (94) is provided at the top of the friction shaft (93). Inside the outer casing (91), a drive shaft (95) is rotatably mounted. Both ends of the drive shaft (95) are meshed with the tooth grooves of two bevel gears (94). One end of the outer casing (91) is provided with a reduction gearbox (96), which is used for gear meshing and transmission with the drive shaft (95).

9. The cleaning apparatus for processing plastic products according to claim 8, characterized in that: A cleaning fluid delivery pump (11) is installed at one end of the equipment frame (1), and a negative pressure pump (12) is installed on one side of the cleaning fluid delivery pump (11). A liquid delivery pipe (13) is connected to one end of the cleaning fluid delivery pump (11), and a negative pressure pipe (14) is connected to one end of the negative pressure pump (12). Both the liquid delivery pipe (13) and the negative pressure pipe (14) extend into the interior of the equipment frame (1). One end of the liquid delivery pipe (13) and the negative pressure pipe (14) is arranged with a branched connecting pipe (15). The branched connecting pipe (15) is fixed to each built-in truss (20). The liquid delivery pipe (13) and the negative pressure pipe (14) are each arranged with a group of branched connecting pipes (15). Each group of branched connecting pipes (15) is connected to the liquid guide pipe (48). One end of the liquid delivery pipe (13) is connected to the liquid guide pipe (48) at the lower end of the cleaning belt (31). One end of the negative pressure pipe (14) is connected to the liquid guide pipe (48) at the lower end of the negative pressure belt (71).

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