CN212737256U

CN212737256U - Color paper gluing device of world box forming machine

Info

Publication number: CN212737256U
Application number: CN202020991570.2U
Authority: CN
Inventors: 杜龙
Original assignee: Guangzhou Duhong Automation Machinery Equipment Co ltd
Current assignee: Guangzhou Duhong Automation Machinery Equipment Co ltd
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2021-03-19
Anticipated expiration: 2030-06-03

Abstract

The utility model discloses a various paper rubber coating device of world box make-up machine, including gluing the bucket and being provided with the work platform of conveyer belt, work platform rotates and is connected with two pinch rolls, motor drive setting is passed through in the pivot of at least one pinch roll, the axis of two pinch rolls all sets up with the direction of transfer mutually perpendicular of conveyer belt, two mutual butts of pinch roll, the outer peripheral face of gluing the bucket has the drawing liquid pump through the pipeline intercommunication, the liquid outlet intercommunication of drawing liquid pump has the fluid-discharge tube, the fluid-discharge tube is kept away from the one end of drawing liquid pump and is towards the butt position between two pinch rolls, work platform is provided with the recovery unit of retrieving the glue that overflows between two pinch rolls. Through setting up the pinch rolls of two mutual butts, through the suction guide effect of drawing liquid pump, to the mode of butt position addition glue between two pinch rolls to replace the manual work to carry out the gummed operation to the pinch roll surface, utilize recovery unit to retrieve the glue that spills over simultaneously, the saving cost of labor that can the preferred improves work efficiency.

Description

Color paper gluing device of world box forming machine

Technical Field

The utility model relates to a technical field of paper rubber coating device, concretely relates to various paper rubber coating device of world box make-up machine.

Background

The box body with the relatively closed surface is formed by oppositely buckling two large and small top and bottom box openings, and the top and bottom box is called a top and bottom box in a packaging mode and is widely applied to packaging boxes, shoe boxes, storage boxes and the like. Because of its assembly characteristics, the two boxes that make up the box with their surfaces relatively closed are called heaven and earth boxes. The heaven and earth box comprises a panel and color paper, the panel is bent according to a crease mark drawn in advance, then the intersection between adjacent side surfaces in the surface of the bent panel is glued and fixed, and finally the color paper is stuck on the surface of the panel in a gluing and bonding mode.

The feeder for feeding paper is called a feeder, and the box forming machine usually includes a color paper feeder for feeding color paper, a panel (hard board) feeder, a panel corner attaching machine feeder, and a color paper and panel forming device. Wherein, various paper flies to reach the device and includes work platform, and work platform is provided with the conveyer belt of transmission various paper, and work platform passes through motor drive to be provided with the pinch roller with the conveying face butt of conveyer belt, and the pinch roller is used for compressing tightly the various paper that the conveyer belt transmission was come to keep various paper surfacing.

Because paste on the panel through sticky mode during the color paper, consequently can generally compress tightly the color paper product at the pinch roller, carry out the rubber coating operation to the face of pasting of color paper simultaneously, current rubber coating mode is scribbled on the pinch roller surface through artificial mode and is established a certain amount of liquid glue usually, utilizes the adhesive force on pinch roller surface to make partial liquid glue adhere to the surface at the pinch roller, through the transmission of motor, scribble the liquid glue on pinch roller surface and establish on the face of pasting of color paper when compressing tightly color paper. Although this kind of mode can follow the operation of gluing to the face of pasting of color paper to a certain extent, along with operating time's extension, the liquid glue on compression roller surface also can reduce thereupon, and then leads to the glue on the face of pasting of color paper to reduce the stickness that the face of pasting of color paper, even causes the condition that does not have liquid glue on the face of pasting of color paper and loses the effect of pasting to take place, consequently needs to carry out the rubber coating operation to compression roller surface regularly, causes artifical consumption from this.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a color paper gluing device of a world box forming machine, which can replace manual operation to increase liquid glue on the surface of a pressing roller.

The purpose of the utility model is realized through the following technical scheme:

the utility model provides a various paper rubber coating device of world box make-up machine, is including gluing bucket and work platform, work platform is provided with the conveyer belt through motor drive, work platform rotate be connected with two all with the pinch rolls of work platform conveyer belt butt, at least one the pivot of pinch roll passes through motor drive and sets up, two the axis of pinch roll all with the direction of transfer mutually perpendicular of conveyer belt sets up, two the mutual butt of pinch roll, the outer peripheral face of gluing the bucket has the drawing liquid pump through the pipeline intercommunication, the liquid outlet intercommunication of drawing liquid pump have with the fluid-discharge tube that work platform is connected, the fluid-discharge tube is kept away from the one end of drawing liquid pump is two downwards the butt position between the pinch rolls, work platform is provided with the recovery unit who retrieves from two the glue that spills over between the pinch rolls.

Further, the recovery device comprises two collecting boxes embedded in the working platform, the box openings of the collecting boxes are arranged towards the two pressing roller abutting positions, the two collecting boxes are respectively arranged at the two ends of the pressing roller along the axis, the collecting boxes are abutted to the two pressing rollers along the end face of the axis, the inner wall of each collecting box is arranged towards the two pressing roller abutting positions, the upper edges of the pressing roller abutting positions are in chamfer arrangement, the box bottom faces of the collecting boxes are communicated with liquid outlet pipes, and the liquid outlet pipes are communicated with the glue barrel.

Further, a filter screen is covered and arranged at an opening between the collecting box and the liquid outlet pipe.

Further, a straight groove for the collection box and the liquid outlet pipe to pass through is formed in the side face of the working platform facing the collection box, a sealing plate is detachably connected to the opening of the straight groove in a sealing mode, a plurality of springs are arranged between the sealing plate and the collection box, one ends of the springs are abutted to the collection box, and the other ends of the springs are abutted to the sealing plate.

Furthermore, a liquid collecting box is arranged below the collecting box of the working platform, one end, far away from the collecting box, of the liquid outlet pipe is communicated with the liquid collecting box, an extension cavity is integrally formed in the side face, horizontally facing the glue barrel, of the liquid collecting box, and a through hole which is right opposite to a barrel opening of the glue barrel is formed in the bottom face of the extension cavity.

Further, the inner bottom surface of the extension cavity and the inner bottom surface of the liquid collecting box are arranged in an intersecting mode, the inner bottom surface of the extension cavity faces the glue barrel and is arranged downwards in an inclined mode, the through hole is located at the lower end of the inner bottom surface of the extension cavity, a barrel opening of the glue barrel is communicated with a hopper, the hopper is arranged in an expanding mode from bottom to top, and an opening of the hopper is opposite to the through hole.

Furthermore, a channel opposite to the glue barrel is arranged on the side surface of the working platform in a penetrating manner.

Further, the tail end of the liquid discharge pipe, which is far away from the liquid pump, is communicated with a plurality of branch pipes which face the abutting positions of the two pressing rollers, and the branch pipes are arranged at intervals along the axial direction of the pressing rollers.

Further, a plurality of air suction holes are communicated with the conveying surface of the conveying belt, the working platform is provided with an air suction cavity, the top surface of the air suction cavity is open, the open end of the air suction cavity is abutted to the end face, deviating from the conveying surface, of the conveying belt, the open end of the air suction cavity is opposite to the two pressing rollers, and the air suction cavity is communicated with the air suction pump through a pipeline.

The utility model discloses following beneficial effect has:

a color paper gluing device of a world box forming machine is characterized in that a driving belt is arranged to transmit color paper products, pressing rollers are arranged to press the products, glue in a glue barrel is pumped to a liquid discharge pipe by a liquid pump, the tail end of the liquid discharge pipe far away from the liquid pump faces to the abutting position between the two pressing rollers, and the two pressing rollers are abutted with each other, so that a gap between the two pressing rollers is small and relatively fixed, excessive glue cannot pass through the gap between the two pressing rollers, a thin gluing layer is formed on the surfaces of the two pressing rollers and is used for gluing the pasting surface of color paper, and meanwhile, the excessive glue flows to the two ends of the pressing rollers in the axial direction after being accumulated at the abutting position between the two pressing rollers and finally overflows from the abutting position between the two pressing rollers in the axial direction of the pressing rollers, glue that will overflow through setting up recovery unit retrieves to reduce glue and directly flow to work platform and cause the pollution to work platform, and lead to the fact extravagant condition to glue, thereby reach and keep operational environment clean, practice thrift manufacturing cost's beneficial effect. Consequently, through setting up the pinch rolls of two mutual butts, through the suction guide effect of drawing liquid pump, to the mode of butt position addition glue between two pinch rolls to replace current manual work to carry out gummed operation to the pinch roll surface at indefinite time, saving cost of labor that can the preferred improves work efficiency.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic diagram of the local explosion of the present invention.

Fig. 3 is a cross-sectional view of the present invention.

Fig. 4 is a schematic structural view of the collecting box and the liquid outlet pipe of the present invention.

Fig. 5 is a partially enlarged view of a portion a in fig. 2.

Fig. 6 is a partially enlarged view of fig. 3 at B.

In the figure: 1. a working platform; 11. a vertical plate; 111. a channel; 12. a conveyor belt; 13. a suction hole; 14. a straight groove; 15. a receiving groove; 16. a sealing plate; 17. a spring; 18. a connecting rod; 19. connecting sheets; 2. a pressure roller; 3. a glue barrel; 31. a hopper; 4. a liquid pump; 5. a liquid discharge pipe; 51. pipe distribution; 6. a recovery device; 61. a collection box; 611. chamfering; 612. a filter screen; 62. a liquid outlet pipe; 63. a liquid collection tank; 64. an elongated cavity; 65. and (4) a raised column.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments. In the present specification, the terms "upper", "inner", "middle", "left", "right" and "one" are used for convenience of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the corresponding parts may be changed or adjusted without substantial technical changes.

Referring to fig. 1 to 3, a color paper gluing device of a world box forming machine comprises a glue barrel 3 and a working platform 1, wherein the glue barrel 3 and the working platform 1 are supported on the bottom surface, the working platform 1 comprises two vertical plates 11 which are supported on the ground and are opposite to each other, the vertical plates 11 are arranged in a similar cuboid shape, a conveyor belt 12 is arranged between the two vertical plates 11 through motor driving, the conveyor belt 12 is arranged at the top part between the two vertical plates 11, two pressing rollers 2 which are respectively abutted against the top conveying surface of the conveyor belt 12 of the working platform 1 are arranged between the two vertical plates 11, the pressing rollers 2 are rotatably connected with the vertical plates 11, the axes of the two pressing rollers 2 are respectively arranged perpendicular to the conveying direction of the conveyor belt 12, the peripheral surfaces of the two pressing rollers 2 are abutted against each other, the rotating directions of the two pressing rollers 2 are consistent, wherein the rotating shafts of the pressing rollers 2 far away from the conveying direction of the conveyor belt, glue bucket 3 and be linked together through the inlet of pipeline with drawing liquid pump 4, and the liquid outlet intercommunication of drawing liquid pump 4 has fluid-discharge tube 5 of being connected with work platform 1, and the one end that drawing liquid pump 4 was kept away from to fluid-discharge tube 5 sets up towards the butt position between two pinch rolls 2 downwards, and work platform 1 installs the recovery unit 6 of retrieving the glue that overflows from between two pinch rolls 2.

Referring to fig. 2 and 3, in order to enable the glue collected in the drain pipe 5 to be uniformly applied in the position of abutment between the two pressure rollers 2, the glue distribution on the surface of the two pressure rollers 2 is uniform. The tail end of the liquid discharge pipe 5 far away from the liquid pump 4 is communicated with two branch pipes 51 which face the abutting positions of the two pressing rollers 2, and the two branch pipes 51 are arranged at intervals along the axial direction of the pressing rollers 2. The top surfaces of the two vertical plates 11 are connected with the same connecting rod 18 through screw locking, the axis of the connecting rod 18 is perpendicular to the conveying direction of the conveying belt 12, the middle part of the connecting rod 18 is connected with a connecting sheet 19 through screw locking, and the tail end of the liquid discharge pipe 5 far away from the liquid pump 4 is fixedly connected with the connecting sheet 19 in an inserting mode.

Referring to fig. 2 to 6, in order to effectively recover the glue overflowing from between the two pressing rollers 2, the situation that the work platform 1 is polluted after the glue overflows is reduced, the glue is recycled, and finally the production cost is saved. Recovery unit 6 includes that two parts are respectively inlayed and are located collection box 61 in two risers 11 of work platform 1 orientation pinch roller 2's the side, it is the setting of type cuboid form to collect box 61, the box mouth of collecting box 61 upwards sets up towards two pinch roller 2 butt positions, two collection box 61 branches are listed in pinch roller 2 along the both ends of axis direction, collect box 61 and two pinch roller 2 along the terminal surface butt of axis direction, the intersection between the top surface of collecting box 61's internal perisporium and collection box 61 is chamfer 611 setting, the box bottom surface intercommunication of collecting box 61 has drain pipe 62, drain pipe 62 and gluey bucket 3 intercommunication.

Specifically, glue spills over from the terminal surface along compressing roller 2 axis direction from the position between two compressing rollers 2, sets up chamfer 611 through intersection between the internal perisporium and the top surface of collecting box 61, the glue part that is favorable to reducing and spills over is detained at the top surface of collecting box 61, chamfer 611 is used for improving the water conservancy diversion effect of glue, finally reach the effect of the glue that effectively collects and spill over, and flow back glue to gluing in bucket 3 with the pipeline, thereby realize the cyclic utilization of glue.

Referring to fig. 3 to 6, because suspended impurities often exist in the air of a workshop, and paper scraps with light weight can float in the air under the action of air flow, and impurities and paper scraps can fall on the glue position between the two pressing rollers 2, the situation that the impurities flow back to the glue barrel 3 to pollute the glue in the glue barrel 3 is reduced for filtering the impurities of the glue overflowing between the two pressing rollers 2. A filter screen 612 is covered and installed at an opening between the collecting box 61 and the liquid outlet pipe 62, and the filter screen 612 is fixedly connected with the collecting box 61.

Referring to fig. 3 to 6, in order to clean the foreign substances in the collecting box 61, it is necessary to periodically clean the foreign substances in the collecting box 61 since the foreign substances and paper dust are accumulated to block the filter opening of the filter net 612, so that the glue cannot be filtered well and the glue flows back into the glue bucket 3. The side of the vertical plate 11 facing the collecting box 61 is provided with a straight groove 14 for the collecting box 61 and the liquid outlet pipe 62 to pass through, the side of the vertical plate 11 far away from the conveyor belt 12 is provided with a containing groove 15 communicated with the straight groove 14, the containing groove 15 is inserted with a sealing plate 16, the sealing plate 16 is arranged to cover the notch of the straight groove 14 in a sealing way, the sealing plate 16 is connected with the vertical plate 11 of the working platform 1 in a locking way through screws, a plurality of springs 17 are arranged between the sealing plate 16 and the collecting box 61, one end of each spring 17 is abutted against the collecting box 61, the other end of each spring 17 is abutted, when the sealing plate 16 is locked and attached to the standing plate 11 by a screw, the spring 17 is in a compressed state, and by using the expansion and contraction characteristics of the spring 17, thereby support tight collection box 61, cause collection box 61 to support tightly with the terminal surface of pinch roller 2 to keep the relatively stable state, reduce the condition that the glue that overflows leaks from the gap between collection box 61 and pinch roller 2.

Referring to fig. 1 to 3, a liquid collecting tank 63 is installed between two vertical plates 11 of the working platform 1, the liquid collecting tank 63 is arranged in a hollow cuboid shape, the liquid collecting tank 63 is located under two pressing rollers 2, one end of the liquid outlet pipe 62, which is far away from the collecting box 61, is connected with the top surface of the liquid collecting tank 63, the liquid outlet pipe 62 is communicated with the liquid collecting tank 63, a hollow extension cavity 64 is integrally connected with the side surface of the liquid collecting tank 63, which horizontally faces the glue barrel 3, the extension cavity 64 is communicated with the liquid collecting tank 63, a protruding column 65, which is opposite to the barrel mouth of the glue barrel 3, protrudes from the bottom surface of the extension cavity 64, and a through hole (not shown in the figure) communicated with the liquid collecting tank 63 penetrates through the bottom surface, which faces the barrel mouth of.

It is specific, because collect box 61 and glue the distance between the bucket 3 far away, and the pipeline has the flexibility, through setting up liquid collecting tank 63 and stretching out the chamber in order to shorten the distance between collection box 61 and the gluey bucket 3, reduce the condition that glue is detained in the pipeline simultaneously, and then make the glue in the collection box 61 flow back to gluing in the bucket 3 effectively, thereby realize the condition of glue cyclic utilization, in order further to realize reaching the effect that replaces artifical glue that increases to compression roller 2 surfaces, reduce the condition to replenishing glue in the bucket 3, realize practicing thrift human cost and manufacturing cost's effect.

Referring to fig. 1 to 3, in order to increase the flow rate of the glue collected in the liquid collection tank 63 flowing back into the glue barrel 3, and reduce the accumulation of the glue in the liquid collection tank 63 to cause partial solidification, the glue barrel 3 is convenient for workers to supplement and add glue. The inner bottom surface of the extension cavity 64 and the inner bottom surface of the liquid collecting box 63 are arranged in an intersecting mode, the inner bottom surface of the extension cavity 64 is arranged downwards towards the inclined direction of the rubber barrel 3, the through hole (not shown in the figure) is located at the lower end of the inner bottom surface of the extension cavity 64, the barrel opening of the rubber barrel 3 is communicated with the hopper 31, the hopper 31 is arranged in an oval shape in a cross section parallel to the ground, the hopper 31 is gradually enlarged from bottom to top, and the opening of the hopper 31 is opposite to the through hole (not shown in the figure.

Referring to fig. 1 to 3, in order to facilitate the storage of the glue barrel 3 in the work platform 1 and to facilitate the work of adding glue into the glue barrel 3 by a worker, a larger operation space is provided, and the side surfaces of the two vertical plates 11 of the work platform 1 are all penetrated with a passage 111 toward the glue barrel 3.

Referring to fig. 1 to 3, since the surface of the pressure roller 2 is coated with glue, the surface of the pressure roller 2 has viscosity, and further, the color paper on a part of the transmission belt is adsorbed on the surface of the pressure roller 2, so as to reduce the effectiveness of the transmission belt 12 for transmitting the color paper. The conveying surface of conveyer belt 12 evenly link up and has a plurality of suction holes 13, the aperture of suction hole 13 is less than the size of color paper, it has the chamber of breathing in (not shown in the figure) to attach through the screw lock between two risers 11, the chamber of breathing in is located the position between two upper and lower surfaces of conveyer belt 12 along the high direction, the top of chamber of breathing in (not shown in the figure) is the opening setting that is linked together with the chamber of breathing in, the opening of chamber of breathing in and the terminal surface butt that deviates from its conveying surface with the transmission, the open end of chamber of breathing in is just right to each other with two pinch rolls 2, the open end of chamber of breathing in covers two pinch rolls 2 settings, be linked together through the extraction opening of pipeline and aspiration pump in the chamber of breathing in, the suction that makes the suction hole 13 that is just right to color paper through the suction of aspiration action.

In summary, the driving belt is arranged to convey the color paper product, the pressing rollers 2 are arranged to press the product, the liquid pump 4 is used to pump the glue in the glue barrel 3 to the liquid discharge pipe 5, the end of the liquid discharge pipe 5 far away from the liquid pump 4 faces the abutting position between the two pressing rollers 2, and the two pressing rollers 2 abut against each other, so that the gap between the two pressing rollers 2 is small and relatively fixed, and further, the excessive glue cannot pass through the gap between the two pressing rollers 2, so that a thin glue coating layer is formed on the surfaces of the two pressing rollers 2 to glue the adhering surface of the color paper, and meanwhile, after the excessive glue is accumulated at the abutting position between the two pressing rollers 2, the excessive glue flows towards the two ends of the pressing rollers 2 along the axial direction, and finally overflows from the abutting position between the two pressing rollers 2 along the two ends of the axial direction of the pressing rollers 2, glue that will overflow is retrieved through setting up recovery unit 6 to reduce glue and directly flow to work platform 1 and cause the pollution to work platform 1, and cause extravagant condition to glue, thereby reach and keep operational environment clean, practice thrift manufacturing cost's beneficial effect. Consequently, through setting up the pinch roller 2 of two mutual butts, through the suction guide effect of drawing liquid pump 4, to the mode of butt position addition glue between two pinch rollers 2 to replace current manual work to carry out gummed operation on pinch roller 2 surface at indefinite time, saving cost of labor that can the preferred improves work efficiency.

The embodiment of the present invention is not limited to this, according to the above-mentioned content of the present invention, the common technical knowledge and the conventional means in the field are utilized, without departing from the basic technical idea of the present invention, the present invention can also make other modifications, replacements or combinations in various forms, all falling within the protection scope of the present invention.

Claims

1. A color paper gluing device of a world box forming machine is characterized in that: including gluing bucket and work platform, work platform is provided with the conveyer belt through motor drive, work platform rotate be connected with two all with the pinch rolls of work platform conveyer belt butt, at least one the pivot of pinch rolls is passed through motor drive and is set up, two the axis of pinch rolls all with the direction of transfer mutually perpendicular of conveyer belt sets up, two the mutual butt of pinch rolls, the outer peripheral face of gluing the bucket has the drawing liquid pump through the pipeline intercommunication, the liquid outlet intercommunication of drawing liquid pump have with the fluid-discharge tube that work platform is connected, the fluid-discharge tube is kept away from the one end of drawing liquid pump is two downwards towards two butt position between the pinch rolls, work platform is provided with retrieves from two the recovery unit of the glue that spills over between the pinch rolls.

2. The color paper gluing device of the top and bottom box forming machine as claimed in claim 1, wherein: recovery unit includes that two inlay and locates collection box in the work platform, the box mouth orientation of collecting the box is two pinch roller butt position sets up, two collect the box branch list in the both ends of pinch roller along the axis, collect box and two the terminal surface butt of pinch roller along the axis, collect box inner wall orientation two the last border of pinch roller butt position is the chamfer setting, the box bottom surface intercommunication of collecting the box has the drain pipe, the drain pipe with glue the bucket intercommunication.

3. The color paper gluing device of the top and bottom box forming machine as claimed in claim 2, wherein: and a filter screen is covered and arranged at an opening between the collection box and the liquid outlet pipe.

4. The color paper gluing device of the top and bottom box forming machine as claimed in claim 3, wherein: the side of the working platform faces the collecting box and is provided with a straight groove for the collecting box and the liquid outlet pipe to pass through, the working platform is positioned at the opening of the straight groove and is connected with a sealing plate in a sealing and detachable manner, a plurality of springs are arranged between the sealing plate and the collecting box, one ends of the springs are abutted to the collecting box, and the other ends of the springs are abutted to the sealing plate.

5. The color paper gluing device of the top and bottom box forming machine as claimed in claim 2, wherein: the working platform is located a liquid collecting box is arranged below the collecting box, one end of the liquid outlet pipe, which is far away from the collecting box, is communicated with the liquid collecting box, the liquid collecting box horizontally faces towards the side face of the glue barrel, an extension cavity is integrally arranged on the side face of the glue barrel, and a through hole which is right opposite to a barrel opening of the glue barrel is formed in the bottom face of the extension cavity.

6. The color paper gluing device of the top and bottom box forming machine as claimed in claim 5, wherein: the inner bottom surface of the extension cavity and the inner bottom surface of the liquid collecting box are arranged in an intersecting mode, the inner bottom surface of the extension cavity faces the glue barrel and is arranged downwards in an inclined mode, the through hole is located at the low end of the inner bottom surface of the extension cavity, the barrel opening of the glue barrel is communicated with a hopper, the hopper is arranged in an enlarged mode from bottom to top gradually, and the opening of the hopper and the through hole are opposite to each other.

7. The color paper gluing device of the top and bottom box forming machine as claimed in claim 1, wherein: and a channel opposite to the glue barrel is arranged on the side surface of the working platform in a penetrating way.

8. The color paper gluing device of the top and bottom box forming machine as claimed in claim 1, wherein: the tail end of the liquid discharge pipe, which is far away from the liquid pump, is communicated with a plurality of branch pipes which face the abutting positions of the two pressing rollers, and the branch pipes are arranged at intervals along the axial direction of the pressing rollers.

9. The color paper gluing device of the top and bottom box forming machine as claimed in claim 1, wherein: the conveying surface of the conveying belt is communicated with a plurality of air suction holes, the working platform is provided with an air suction cavity, the top surface of the air suction cavity is open, the open end of the air suction cavity is abutted to the end face of the conveying belt, which deviates from the conveying surface of the conveying belt, the open end of the air suction cavity is opposite to the two compressing rollers, and the air suction cavity is communicated with the air suction pump through a pipeline.