Gradient pressure multi-net composite device for grey paperboard production

Abstract

The invention provides a gradient pressure multi-net composite device for grey paperboard production, and relates to the field of grey paperboard production, the gradient pressure multi-net composite device comprises a device support frame, a water absorption pressure roller, a vacuum couch roller, a guide mounting box, a guide mounting seat and a cleaning needle plate; the water absorption pressing roller is rotationally connected to the right side of the device supporting frame. The vacuum couch roll is rotationally connected to the right side of the device supporting frame. The guide mounting box is in bolted connection with the right side of the device supporting frame; the guide mounting seat is connected to the inner side of the guide mounting box in a sliding manner; according to the negative-pressure water suction hole cleaning device, the situation that a device needs to be shut down when negative-pressure water suction holes are cleaned is avoided, a large amount of time consumed by shutdown cleaning is saved, and the production efficiency of grey paperboards is improved; the problem that the production efficiency of grey paperboards is affected due to the fact that frequent shutdown for cleaning the vacuum couch roll takes a long time is solved.

Description

Technical Field

[0001] This invention relates to the field of grey paperboard production technology, and in particular to a gradient pressure multi-wire composite device for grey paperboard production. Background Technology

[0002] In the production of grey cardboard, pulp of different beating degrees is first spread on the long wire of a three-wire cardboard machine through a headbox. Then, the pulp is transported to the dewatering zone by the movement of the long wire. The water in the wet paper web is removed from the gaps of the long wire by a vacuum suction box. After the wet paper web of the surface layer, core layer and bottom layer of grey cardboard has completed its initial dewatering, the wet paper web is sent to the press zone. The wet paper web is further dewatered by the pressure rollers and vacuum flat rollers. After dewatering, the wet paper web is transported to the pre-compositing zone by guide rollers. The position of each layer is initially fixed by low-pressure rollers. The pre-pressed paper blank enters the main pressing zone. The large-diameter pressure rollers make the fibers tightly interweave and intercalate the fibers between layers. Finally, the paper blank enters the setting zone. The low-pressure composite rollers finely adjust and compact the paper blank to ensure that there are no air bubbles or gaps between the layers. The paper blank is heated by a gradient drying cylinder to eliminate the internal stress generated during the pressing process and prevent the cardboard from warping.

[0003] For example, patent CN110080031A discloses a production process for a special core paper for high-grade grey board composite paperboard. This production process does not use ONP pulp; the surface pulp and bottom pulp use 100% OCC pulp, resulting in paper with good flatness and no delamination. The paper's adhesive absorption and bonding properties are improved, meeting the requirements for the core paper of high-grade composite grey board paperboard. At the same time, because the core pulp with a large pulp ratio uses a mixture of OCC pulp, recycled slag pulp, wood chip pulp, and recycled sludge pulp, the basis weight, density, interlayer bonding strength, thickness, and ash content are all guaranteed. The ONP pulping line and the paper machine's wire section are shut down, thereby reducing the installed power of the pulping and paper machine, achieving the goals of energy saving, consumption reduction, and improved product quality. The basis weight range of the composite special core paper produced is 280-700 g / m2, replacing single grey board paper, and it is used for the core and inner layers of high-grade multilayer composite grey board paperboard. According to calculations, the production cost per ton of paper is reduced by about 70 yuan, and based on an annual output of 150,000 tons, the annual production cost can be reduced by 10.5 million yuan.

[0004] However, after a period of use, some loose fibers and impurities from the wet paper web can easily enter the suction holes of the vacuum coil, causing blockage and affecting the dewatering efficiency and uniformity of the vacuum coil on the wet paper web. Therefore, the vacuum coil needs to be cleaned regularly. However, frequent shutdowns for cleaning the vacuum coil take a long time, which not only increases the workload of the staff but also leads to longer downtime of the equipment, affecting the production efficiency of gray paperboard. Summary of the Invention

[0005] In view of this, the present invention provides a gradient pressure multi-wire composite device for gray paperboard production. It dynamically cleans the negative pressure suction holes of the vacuum coil roll using a cleaning needle plate, avoiding the need to shut down the device for cleaning the negative pressure suction holes. This saves a significant amount of time spent on downtime cleaning, greatly reduces the workload of workers, ensures the continuity of gray paperboard production, and improves production efficiency. Simultaneously, continuous cleaning ensures that the negative pressure suction holes of the vacuum coil roll remain unobstructed, effectively maintaining its dewatering efficiency and uniformity for the wet paper web, and preventing uneven wetting and drying of the wet paper web due to suction hole blockage. This is achieved through a second vacuum... The system, consisting of a box, absorbent felt, wastewater collection scraper, and first vacuum box, efficiently absorbs and promptly removes excess moisture from the wet paper web, further enhancing the dewatering effect. The first and second filters effectively filter the absorbed wastewater, which is then transported to a high-pressure nozzle via a high-pressure water pump and water pipes. This wastewater can be used for long-web cleaning, achieving water resource recycling and reducing production water consumption costs. The gradient pressure setting through low-pressure pre-composite rollers, large-diameter pressure rollers, and low-pressure setting rollers effectively prevents air bubbles or voids between layers, ensuring the structural integrity and flatness of the grey paperboard, reducing quality defects such as warping and delamination, and improving the physical properties and appearance quality of the grey paperboard.

[0006] This invention provides a gradient pressure multi-wire composite device for gray cardboard production, specifically comprising: a device support frame, absorbent rollers, vacuum flat rollers, guide mounting boxes, a forming structure, a dewatering structure, guide mounting seats, and cleaning needle plates; multiple absorbent rollers are evenly distributed and rotatably connected to the right side of the device support frame; multiple vacuum flat rollers are evenly distributed and rotatably connected to the right side of the device support frame; multiple guide mounting boxes are evenly distributed and bolted to the right side of the device support frame; the forming structure is located inside the device support frame; multiple guide mounting seats are slidably connected to the inner side of the multiple guide mounting boxes via cylindrical shafts; multiple cleaning needle plates are slidably connected vertically to the upper part of the multiple guide mounting seats; and the dewatering structure is located on the right side of the device support frame.

[0007] Furthermore, the molding structure includes a first wastewater collection box, a wastewater collection scraper, and a first vacuum box; multiple first wastewater collection boxes are provided, and the multiple first wastewater collection boxes are evenly distributed and bolted to the right side of the device support frame; multiple wastewater collection scrapers are provided, and the multiple wastewater collection scrapers are evenly distributed and bolted to the right side of the device support frame; multiple first vacuum boxes are provided, and the multiple first vacuum boxes are respectively bolted to the upper side of the multiple wastewater collection scrapers.

[0008] Furthermore, the forming structure also includes a low-pressure pre-composite roller, a large-diameter pressure roller, and a low-pressure shaping roller; two low-pressure pre-composite rollers are provided, and both low-pressure pre-composite rollers are rotatably connected to the left side of the device support frame; two large-diameter pressure rollers are provided, and both large-diameter pressure rollers are rotatably connected to the left side of the device support frame; two low-pressure shaping rollers are provided, and both low-pressure shaping rollers are rotatably connected to the left side of the device support frame.

[0009] Furthermore, the molding structure also includes absorbent felt, negative pressure suction holes, and push-button switches; multiple absorbent felts are provided, and the multiple absorbent felts are respectively bonded to the outer side of multiple absorbent pressure rollers; multiple negative pressure suction holes are provided, and the multiple negative pressure suction holes are evenly distributed on the outer side of multiple vacuum rollers, and the diameter of the negative pressure suction holes at the edge of the vacuum roller is smaller than that of the negative pressure suction holes in the middle of the vacuum roller; multiple push-button switches are provided, and the multiple push-button switches are respectively provided on the inner side of multiple guide mounting boxes.

[0010] Furthermore, the molding structure also includes a limiting guide roller, a first reset elastic element, and a guide connecting rod; two limiting guide rollers are provided, and the two limiting guide rollers are rotatably connected to the upper and lower sides of the device support frame respectively; multiple first reset elastic elements are provided, the inner ends of the multiple first reset elastic elements are respectively fixedly connected to the outer sides of the multiple guide mounting seats, and the outer ends of the multiple first reset elastic elements are respectively fixedly connected to the inner sides of the multiple guide mounting boxes; multiple guide connecting rods are provided, and the multiple guide connecting rods are evenly distributed and fixedly connected to the upper part of the multiple guide mounting seats, and the multiple guide connecting rods are respectively slidably connected to the multiple cleaning needle plates.

[0011] Furthermore, the molding structure also includes a positioning metal plate, a second reset elastic element, and a positioning electromagnet; multiple positioning metal plates are provided, and the multiple positioning metal plates are respectively fixedly connected to the front and rear sides of multiple guide mounting seats; multiple second reset elastic elements are provided, the upper ends of the multiple second reset elastic elements are respectively fixedly connected to the lower part of multiple cleaning needle plates, and the lower ends of the multiple second reset elastic elements are respectively fixedly connected to the upper part of multiple guide mounting seats; multiple positioning electromagnets are provided, and the multiple positioning electromagnets are respectively fixedly connected to the front and rear sides of multiple cleaning needle plates; multiple push-button switches are respectively connected in series with the control circuits of the multiple positioning electromagnets.

[0012] Furthermore, the dewatering structure includes a second wastewater collection box and a long net mounting frame; multiple second wastewater collection boxes are provided, and the multiple second wastewater collection boxes are evenly distributed and bolted to the right side of the device support frame; multiple long net mounting frames are provided, and the multiple long net mounting frames are evenly distributed and bolted to the right side of the device support frame.

[0013] Furthermore, the dehydration structure also includes a second vacuum chamber and a negative pressure fan; multiple second vacuum chambers are provided, and the multiple second vacuum chambers are evenly distributed and bolted to the inner side of multiple long mesh mounting frames; multiple negative pressure fans are provided, and the multiple negative pressure fans are evenly distributed and bolted to the upper part of multiple second vacuum chambers.

[0014] Furthermore, the dehydration structure also includes a first filter screen and a second filter screen; multiple first filter screens are provided, and multiple first filter screens are respectively fixedly connected to the middle of multiple second vacuum chambers; multiple second filter screens are provided, and multiple second filter screens are respectively fixedly connected to the left and right sides of multiple second vacuum chambers.

[0015] Furthermore, the dehydration structure also includes a high-pressure water pump and a water guide pipe; multiple high-pressure water pumps are provided, and the multiple high-pressure water pumps are respectively bolted to the lower part of multiple second vacuum boxes; multiple water guide pipes are provided, and the multiple water guide pipes are respectively fixedly connected to the output end of the multiple high-pressure water pumps, and multiple high-pressure nozzles are fixedly connected to the lower part of the multiple water guide pipes.

[0016] Beneficial effects This invention dynamically cleans the negative pressure suction holes of the vacuum coil roll by using a cleaning needle plate, avoiding the need to shut down the device for cleaning. This saves a significant amount of time spent on downtime cleaning, greatly reduces the workload of workers, ensures the continuity of gray paperboard production, and improves production efficiency. Simultaneously, continuous cleaning ensures that the negative pressure suction holes of the vacuum coil roll remain unobstructed, effectively maintaining its dewatering efficiency and uniformity for the wet paper web, and preventing uneven wetting of the wet paper web due to suction hole blockage. This is achieved through a second vacuum box, absorbent felt, wastewater collection scraper, and a... A vacuum chamber efficiently absorbs and promptly removes excess moisture from the wet paper web, further enhancing the dewatering effect. The first and second filters effectively filter the inhaled wastewater, which is then transported to a high-pressure nozzle via a high-pressure water pump and water pipes. This wastewater can be used for long-web cleaning, achieving water resource recycling and reducing production water consumption costs. The gradient pressure shaping through low-pressure pre-composite rollers, large-diameter pressure rollers, and low-pressure shaping rollers effectively prevents air bubbles or voids between layers, ensuring the structural integrity and flatness of the grey paperboard, reducing quality defects such as warping and delamination, and improving the physical properties and appearance quality of the grey paperboard. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0018] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0019] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram showing the positional relationship between the water-absorbing roller, the vacuum roller, and the guide mounting box of the present invention.

[0021] Figure 3 This is a schematic diagram showing the cooperation relationship between the guide mounting base and the cleaning needle plate of the present invention.

[0022] Figure 4 This is a schematic diagram showing the disassembled structure of the vacuum roller and cleaning needle plate of the present invention.

[0023] Figure 5 This is a schematic diagram showing the cooperation relationship between the guide mounting box and the guide mounting base of the present invention.

[0024] Figure 6 This is a schematic diagram of the structure of the guide mounting base of the present invention.

[0025] Figure 7 This is a schematic diagram showing the positional relationship between the long mesh mounting frame and the second vacuum box of the present invention.

[0026] Figure 8 This is a cross-sectional structural schematic diagram of the second vacuum chamber of the present invention.

[0027] List of reference numerals 1. Device support frame; 101. Limiting guide roller; 102. Low-pressure pre-composite roller; 103. Large diameter pressure roller; 104. Low-pressure shaping roller; 105. First wastewater collection box; 106. Second wastewater collection box; 107. Long net mounting frame; 108. Wastewater collection scraper; 109. First vacuum box; 110. Second vacuum box; 111. Negative pressure fan; 112. First filter screen; 113. Second filter screen; 114. High-pressure water pump; 115. Water guide pipe; 2. Water suction roller; 201. Water absorption felt; 3. Vacuum roller; 301. Negative pressure suction hole; 4. Guide mounting box; 401. Push-button switch; 5. Guide mounting seat; 501. Positioning metal plate; 502. First reset elastic element; 503. Guide connecting rod; 6. Cleaning needle plate; 601. Second reset elastic element; 602. Positioning electromagnet. Detailed Implementation

[0028] Example 1: Please refer to Figures 1 to 6 As shown: This invention provides a gradient pressure multi-wire composite device for gray cardboard production, comprising a device support frame 1, absorbent rollers 2, vacuum coil rollers 3, guide mounting boxes 4, forming structures, guide mounting seats 5, and cleaning needle plates 6; multiple absorbent rollers 2 are evenly distributed and rotatably connected to the right side of the device support frame 1; multiple vacuum coil rollers 3 are evenly distributed and rotatably connected to the right side of the device support frame 1; multiple guide mounting boxes 4 are evenly distributed and bolted to the right side of the device support frame 1; the forming structure is located inside the device support frame 1; multiple guide mounting seats 5 are slidably connected to the inside of multiple guide mounting boxes 4 via cylindrical shafts; multiple cleaning needle plates 6 are slidably connected to the upper part of multiple guide mounting seats 5.

[0029] The molding structure includes a first wastewater collection box 105, a wastewater collection scraper 108, and a first vacuum box 109. Multiple first wastewater collection boxes 105 are provided, and the multiple first wastewater collection boxes 105 are evenly distributed and bolted to the right side of the device support frame 1. Multiple wastewater collection scrapers 108 are provided, and the multiple wastewater collection scrapers 108 are evenly distributed and bolted to the right side of the device support frame 1. Multiple first vacuum boxes 109 are provided, and the multiple first vacuum boxes 109 are respectively bolted to the upper side of the multiple wastewater collection scrapers 108.

[0030] The forming structure also includes a low-pressure pre-composite roller 102, a large-diameter pressure roller 103, and a low-pressure shaping roller 104; two low-pressure pre-composite rollers 102 are provided, and both low-pressure pre-composite rollers 102 are rotatably connected to the left side of the device support frame 1; two large-diameter pressure rollers 103 are provided, and both large-diameter pressure rollers 103 are rotatably connected to the left side of the device support frame 1; two low-pressure shaping rollers 104 are provided, and both low-pressure shaping rollers 104 are rotatably connected to the left side of the device support frame 1.

[0031] The molding structure also includes absorbent felt 201, negative pressure suction holes 301, and push-button switches 401. Multiple absorbent felts 201 are provided, and multiple absorbent felts 201 are respectively bonded to the outer side of multiple absorbent rollers 2. Multiple negative pressure suction holes 301 are provided, and multiple negative pressure suction holes 301 are evenly distributed on the outer side of multiple vacuum rollers 3. The diameter of the negative pressure suction holes 301 at the edge of the vacuum roller 3 is smaller than that of the negative pressure suction holes 301 in the middle of the vacuum roller 3. Multiple push-button switches 401 are provided, and multiple push-button switches 401 are respectively provided on the inner side of multiple guide mounting boxes 4.

[0032] The molding structure also includes a limiting guide roller 101, a first reset elastic element 502, and a guide connecting rod 503. Two limiting guide rollers 101 are provided, and the two limiting guide rollers 101 are rotatably connected to the upper and lower sides of the device support frame 1, respectively. Multiple first reset elastic elements 502 are provided, and the inner ends of multiple first reset elastic elements 502 are fixedly connected to the outer sides of multiple guide mounting seats 5, and the outer ends of multiple first reset elastic elements 502 are fixedly connected to the inner sides of multiple guide mounting boxes 4, respectively. Multiple guide connecting rods 503 are provided, and the multiple guide connecting rods 503 are evenly distributed and fixedly connected to the upper part of multiple guide mounting seats 5, and the multiple guide connecting rods 503 are slidably connected to multiple cleaning needle plates 6, respectively.

[0033] The molding structure also includes a positioning metal plate 501, a second reset elastic element 601, and a positioning electromagnet 602. Multiple positioning metal plates 501 are provided, and each positioning metal plate 501 is fixedly connected to the front and rear sides of multiple guide mounting seats 5. Multiple second reset elastic elements 601 are provided, with their upper ends fixedly connected to the lower parts of multiple cleaning needle plates 6, and their lower ends fixedly connected to the upper parts of multiple guide mounting seats 5. Multiple positioning electromagnets 602 are provided, and each positioning electromagnet 602 is fixedly connected to the front and rear sides of multiple cleaning needle plates 6. Multiple push-button switches 401 are connected in series with the control circuits of the multiple positioning electromagnets 602.

[0034] The specific usage and function of this embodiment are as follows: When processing grey cardboard, the headbox evenly spreads the pulp onto a long wire mesh. The long wire mesh then conveys the laid wet paper web to the left. As the wet paper web moves between the absorbent roller 2 and the vacuum roll 3, the absorbent felt 201 on the outside of the absorbent roller 2 absorbs excess water from the wet paper web. As the absorbent roller 2 rotates, the wastewater collection scraper 108 squeezes out the water from the absorbent felt 201, and the water is promptly removed by the first vacuum box 109, ensuring the absorbent felt 201's effectiveness. Simultaneously, the vacuum roll 3 uses negative pressure suction holes 301... Excess water is absorbed from the wet paper web, and the absorbed water falls directly into the first wastewater collection box 105. When the negative pressure suction hole 301 rotates to its lowest position, the cleaning needle plate 6, which is continuously pressed by the second reset elastic member 601, aligns with the negative pressure suction hole 301 and is pushed into the negative pressure suction hole 301 by the second reset elastic member 601 to clean the fibers blocking the negative pressure suction hole 301 and prevent the negative pressure suction hole 301 from becoming clogged. When the vacuum coil roller 3 rotates, the guide mounting seat 5 and the cleaning needle plate 6 slide along the guide mounting box 4 along with the rotation of the vacuum coil roller 3. After switch 401 is activated, the contacts of the push-button switch 401 are closed, energizing the positioning electromagnet 602 and generating a magnetic force that attracts the positioning metal plate 501. At this time, the cleaning needle plate 6 slides out of the negative pressure suction hole 301. The first reset elastic element 502 pulls the guide mounting seat 5 back to its original position under its own restoring force. At this time, the guide mounting seat 5 is no longer in contact with the push-button switch 401, and the contacts of the push-button switch 401 are disconnected, de-energizing the positioning electromagnet 602. The second reset elastic element 601 pushes the cleaning needle plate 6 back to its original position and fits against the vacuum roller 3. After the next set of negative pressure suction holes 301 moves to the bottom, it automatically inserts into the negative pressure suction hole. In section 301, multiple wet paper webs, after being guided by the water-absorbing pressure roller 2 and the vacuum flat roller 3, enter between two low-pressure pre-composite rollers 102 after being guided by the limiting guide roller 101. The low-pressure pre-composite roller 102 performs preliminary position fixation on the wet paper webs. The fixed paper blanks then enter between two large-diameter pressure rollers 103. The large-diameter pressure rollers 103 squeeze the interlayer fibers to interlock. The paper blanks then enter between two low-pressure shaping rollers 104. The low-pressure shaping rollers 104 finely adjust and compact the paper blanks, completing the forming process of the gray cardboard. The guide connecting rod 503 can limit and guide the sliding of the cleaning needle plate 6.

[0035] Example 2: like Figures 2 to 8 As shown: Based on Embodiment 1, a dehydration structure is also included; the dehydration structure is located on the right side of the device support frame 1.

[0036] The dewatering structure includes a second wastewater collection box 106 and a long net mounting frame 107. Multiple second wastewater collection boxes 106 are provided, and the multiple second wastewater collection boxes 106 are evenly distributed and bolted to the right side of the device support frame 1. Multiple long net mounting frames 107 are provided, and the multiple long net mounting frames 107 are evenly distributed and bolted to the right side of the device support frame 1.

[0037] The dehydration structure also includes a second vacuum chamber 110 and a negative pressure fan 111; multiple second vacuum chambers 110 are provided, and multiple second vacuum chambers 110 are evenly distributed and bolted to the inner side of multiple long mesh mounting frames 107; multiple negative pressure fans 111 are provided, and multiple negative pressure fans 111 are evenly distributed and bolted to the upper part of multiple second vacuum chambers 110.

[0038] The dehydration structure also includes a first filter screen 112 and a second filter screen 113; multiple first filter screens 112 are provided, and multiple first filter screens 112 are respectively fixedly connected to the middle of multiple second vacuum chambers 110; multiple second filter screens 113 are provided, and multiple second filter screens 113 are respectively fixedly connected to the left and right sides of multiple second vacuum chambers 110.

[0039] The dehydration structure also includes a high-pressure water pump 114 and a water guide pipe 115; multiple high-pressure water pumps 114 are provided, and multiple high-pressure water pumps 114 are bolted to the lower part of multiple second vacuum boxes 110 respectively; multiple water guide pipes 115 are provided, and multiple water guide pipes 115 are fixedly connected to the output end of multiple high-pressure water pumps 114 respectively, and multiple high-pressure nozzles are fixedly connected to the lower part of each of the multiple water guide pipes 115.

[0040] The specific usage and function of this embodiment are as follows: When the wet paper web passes through the second vacuum box 110 inside the long wire mounting frame 107, the suction generated by the negative pressure fan 111 will cause the wastewater in the wet paper web to be sucked into the second vacuum box 110. At this time, the first filter screen 112 and the second filter screen 113 will filter the sucked wastewater. The filtered wastewater falls to the lower part of the second vacuum box 110. When there is enough wastewater, the high-pressure water pump 114 is started to pump the wastewater into the water guide pipe 115 and spray it out through the high-pressure nozzle to clean the long wire. The cleaned wastewater will fall directly into the second wastewater collection box 106.

[0041] The following points should be noted in this article: 1. The accompanying drawings of this embodiment only involve the structures involved in this embodiment; other structures can refer to the general design.

[0042] 2. Where there is no conflict, this embodiment and the features in the embodiment can be combined with each other to obtain new embodiments.

[0043] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A gradient pressure multi-wire composite device for gray cardboard production, comprising a device support frame (1), a water-absorbing pressure roller (2), a vacuum coil roller (3), a guide mounting box (4), a forming structure, a dewatering structure, a guide mounting seat (5), and a cleaning needle plate (6); wherein multiple water-absorbing pressure rollers (2) are provided, and the multiple water-absorbing pressure rollers (2) are evenly distributed and rotatably connected to the right side of the device support frame (1); characterized in that: Multiple vacuum rollers (3) are provided, and the multiple vacuum rollers (3) are evenly distributed and rotatably connected to the right side of the device support frame (1); multiple guide mounting boxes (4) are provided, and the multiple guide mounting boxes (4) are evenly distributed and bolted to the right side of the device support frame (1); the forming structure is provided on the inner side of the device support frame (1); multiple guide mounting seats (5) are provided, and the multiple guide mounting seats (5) are slidably connected to the inner side of the multiple guide mounting boxes (4) through cylindrical shafts; multiple cleaning needle plates (6) are provided, and the multiple cleaning needle plates (6) are slidably connected to the upper part of the multiple guide mounting seats (5) respectively; the dewatering structure is provided on the right side of the device support frame (1).

2. The gradient pressure multi-wire laminating device for gray cardboard production as described in claim 1, characterized in that: The molding structure includes a first wastewater collection box (105), a wastewater collection scraper (108), and a first vacuum box (109); multiple first wastewater collection boxes (105) are provided, and multiple first wastewater collection boxes (105) are evenly distributed and bolted to the right side of the device support frame (1); multiple wastewater collection scrapers (108) are provided, and multiple wastewater collection scrapers (108) are evenly distributed and bolted to the right side of the device support frame (1); multiple first vacuum boxes (109) are provided, and multiple first vacuum boxes (109) are bolted to the upper side of multiple wastewater collection scrapers (108).

3. The gradient pressure multi-wire laminating device for gray cardboard production as described in claim 2, characterized in that: The forming structure further includes a low-pressure pre-composite roller (102), a large-diameter pressure roller (103), and a low-pressure shaping roller (104); two low-pressure pre-composite rollers (102) are provided, and both low-pressure pre-composite rollers (102) are rotatably connected to the left side of the device support frame (1); two large-diameter pressure rollers (103) are provided, and both large-diameter pressure rollers (103) are rotatably connected to the left side of the device support frame (1); two low-pressure shaping rollers (104) are provided, and both low-pressure shaping rollers (104) are rotatably connected to the left side of the device support frame (1).

4. The gradient pressure multi-wire laminating device for gray cardboard production as described in claim 3, characterized in that: The molding structure also includes absorbent felt (201), negative pressure suction holes (301), and push-button switches (401); multiple absorbent felts (201) are provided, and multiple absorbent felts (201) are respectively bonded to the outside of multiple absorbent rollers (2); multiple negative pressure suction holes (301) are provided, and multiple negative pressure suction holes (301) are evenly distributed on the outside of multiple vacuum rollers (3), and the diameter of the negative pressure suction holes (301) at the edge of the vacuum roller (3) is smaller than that of the negative pressure suction holes (301) in the middle of the vacuum roller (3); multiple push-button switches (401) are provided, and multiple push-button switches (401) are respectively provided on the inside of multiple guide mounting boxes (4).

5. The gradient pressure multi-wire laminating device for gray cardboard production as described in claim 4, characterized in that: The molding structure further includes a limiting guide roller (101), a first reset elastic element (502), and a guide connecting rod (503); two limiting guide rollers (101) are provided, and the two limiting guide rollers (101) are rotatably connected to the upper and lower sides of the device support frame (1); multiple first reset elastic elements (502) are provided, and the inner ends of multiple first reset elastic elements (502) are fixedly connected to the outer sides of multiple guide mounting seats (5), and the outer ends of multiple first reset elastic elements (502) are fixedly connected to the inner sides of multiple guide mounting boxes (4); multiple guide connecting rods (503) are provided, and the multiple guide connecting rods (503) are evenly distributed and fixedly connected to the upper part of multiple guide mounting seats (5), and the multiple guide connecting rods (503) are slidably connected to multiple cleaning needle plates (6) respectively.

6. The gradient pressure multi-wire laminating device for gray cardboard production as described in claim 5, characterized in that: The molding structure further includes a positioning metal plate (501), a second reset elastic element (601), and a positioning electromagnet (602); multiple positioning metal plates (501) are provided, and multiple positioning metal plates (501) are respectively fixedly connected to the front and rear sides of multiple guide mounting seats (5); multiple second reset elastic elements (601) are provided, and the upper ends of multiple second reset elastic elements (601) are respectively fixedly connected to the lower part of multiple cleaning needle plates (6), and the lower ends of multiple second reset elastic elements (601) are respectively fixedly connected to the upper part of multiple guide mounting seats (5); multiple positioning electromagnets (602) are provided, and multiple positioning electromagnets (602) are respectively fixedly connected to the front and rear sides of multiple cleaning needle plates (6); multiple push-button switches (401) are respectively connected in series with the control circuits of multiple positioning electromagnets (602).

7. The gradient pressure multi-wire laminating device for gray cardboard production as described in claim 1, characterized in that: The dehydration structure includes a second wastewater collection box (106) and a long net mounting frame (107); multiple second wastewater collection boxes (106) are provided, and multiple second wastewater collection boxes (106) are evenly distributed and bolted to the right side of the device support frame (1); multiple long net mounting frames (107) are provided, and multiple long net mounting frames (107) are evenly distributed and bolted to the right side of the device support frame (1).

8. The gradient pressure multi-wire laminating device for gray cardboard production as described in claim 7, characterized in that: The dehydration structure also includes a second vacuum chamber (110) and a negative pressure fan (111); multiple second vacuum chambers (110) are provided, and multiple second vacuum chambers (110) are evenly distributed and bolted to the inner side of multiple long net mounting frames (107); multiple negative pressure fans (111) are provided, and multiple negative pressure fans (111) are evenly distributed and bolted to the upper part of multiple second vacuum chambers (110).

9. The gradient pressure multi-wire laminating device for gray cardboard production as described in claim 8, characterized in that: The dehydration structure further includes a first filter screen (112) and a second filter screen (113); multiple first filter screens (112) are provided, and multiple first filter screens (112) are respectively fixedly connected to the middle of multiple second vacuum chambers (110); multiple second filter screens (113) are provided, and multiple second filter screens (113) are respectively fixedly connected to the left and right sides of multiple second vacuum chambers (110).

10. The gradient pressure multi-wire laminating device for gray cardboard production as described in claim 9, characterized in that: The dehydration structure also includes a high-pressure water pump (114) and a water guide pipe (115); multiple high-pressure water pumps (114) are provided, and multiple high-pressure water pumps (114) are respectively bolted to the lower part of multiple second vacuum boxes (110); multiple water guide pipes (115) are provided, and multiple water guide pipes (115) are respectively fixedly connected to the output end of multiple high-pressure water pumps (114), and multiple high-pressure nozzles are fixedly connected to the lower part of each of the multiple water guide pipes (115).

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