Polyvinyl chloride lamp box fabric laminating machine

Abstract

The invention relates to the technical field of laminating machines, in particular to a polyvinyl chloride lamp-box fabric laminating machine which comprises a side machine shell and a top machine shell, a hot pressing roller and a tension roller are installed in the side machine shell, after a fabric base with PVC slurry at the bottom enters the side machine shell, a plastic extruding machine extrudes PVC to the position above the fabric base, a PVC surface film is formed after the PVC surface film passes through the hot pressing roller, and the tension roller is arranged on the top machine shell. The gradient cooling assembly and the cooling roller are installed in the side machine shell; the gradient cooling assembly comprises a gradient air knife assembly and a pressing assembly which are symmetrically distributed on the upper portion and the lower portion of the lamp-box fabric, the pressing assembly in the gradient cooling assembly can help to press an edge area generating temperature difference with the middle of the lamp-box fabric, curl at the edge of the lamp-box fabric is reduced, and the quality of the lamp-box fabric is improved. In addition, the effect of limiting the airflow action area can be achieved by changing the positions of the first pressing roller and the second pressing roller, airflow can be concentrated, and a better cooling effect is generated in a local area.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laminating machines, in particular to a polyvinyl chloride light box cloth laminating machine. BACKGROUND

[0002] Light box cloth is an outdoor advertising spray material made of polyvinyl chloride (PVC) as the main raw material, mainly used in light boxes, display boards and vehicle body advertising scenes, and its production process is realized by knife scraping method, laminating method or calendering method process. The laminated spray cloth is formed by laminating the upper and lower two layers of PVC film together with the middle light guide fiber net under the pressure of the heating roller and cooling.

[0003] The existing Chinese patent with application number CN202020784739.7 discloses an efficient laminating machine for light box cloth, which comprises a rack, a surface film feeding assembly, a middle layer feeding assembly and a base film feeding assembly are arranged on the rack, the surface film feeding assembly and the middle layer feeding assembly are located on the same side of the surface layer heating roller, the base film feeding assembly is located on the other side of the surface layer heating roller, and the surface film feeding assembly is located below the middle layer feeding assembly.

[0004] In the process of laminating method for producing light box cloth (spray cloth), PVC slurry needs to be covered on the bottom of the cloth base, and then the PVC surface film is covered on the top of the cloth base by using an extruder. After hot pressing by the heating roller, it is formed, and then gradient cooling is carried out to complete the whole production. In the prior art, the gradient cooling arrangement is first air cooling, and then the light box cloth is cooled to about 25℃ by water cooling roller, and the cooling is completed. Correspondingly, without considering the splicing of the light box cloth, in the gradient cooling, the heat is more concentrated in the middle part of the light box cloth, and under the condition of air cooling, the air flow forms vortex at the edge of the light box cloth, and the edge area is directly in contact with the outside. Compared with the cooling condition of the middle part of the light box cloth, it is more difficult to control, and it is more likely to produce temperature difference between the edge and the middle part of the light box cloth. Therefore, after the temperature difference between the edge and the middle part of the light box cloth is generated, curling deformation is easily generated at the edge. SUMMARY

[0005] In view of the above shortcomings of the prior art, the present application provides a polyvinyl chloride light box cloth laminating machine, which can effectively solve the problem of how to reduce the curling defect rate in the prior art.

[0006] To achieve the above purpose, the technical scheme is as follows: The application provides a PVC lamp box cloth laminating machine, which comprises a side machine shell and a top machine shell, a hot pressing roller and a tension roller are installed in the side machine shell, after a cloth base with PVC slurry enters the side machine shell, an extruding machine extrudes PVC onto the cloth base, and a PVC surface film is formed after the hot pressing roller, and the PVC lamp box cloth laminating machine further comprises a gradient cooling assembly and a cooling roller installed in the side machine shell. The gradient cooling assembly comprises a gradient air knife assembly and a pressing assembly symmetrically distributed above and below the PVC lamp box cloth. The gradient air knife assembly comprises a plurality of air knives symmetrically distributed above and below, and the bottom air outlet of the air knife is inclined towards the PVC lamp box cloth. The pressing assembly comprises a plurality of mounting frames installed on the side plates of the side machine shell, and a first pressing roller or a second pressing roller is installed in the mounting frame, a groove is formed in the circumferential side of the first pressing roller, and a protrusion corresponding to the groove of the first pressing roller is arranged on the circumferential side of the second pressing roller, so as to press the edge of the PVC lamp box cloth. The cooling roller is rotatably installed in the side machine shell, the PVC lamp box cloth passes through the two cooling rollers, and cooling is completed.

[0007] Further, the pressing assembly further comprises vertical air cylinders fixedly installed on both sides of the mounting frame, and the vertical air cylinders act on both ends of the first pressing roller or the second pressing roller.

[0008] Further, wing surface baffles are rotatably connected to both sides of the bottom air outlet of the air knife, baffle motors are fixedly installed on both sides of the air knife, the output end of the baffle motor is connected with the wing surface baffle, the baffle motor controls the angle of the wing surface baffle, and the wing surface baffle covers the edge of the PVC lamp box cloth.

[0009] Further, the first pressing roller and the second pressing roller are alternately distributed, the number of the first pressing rollers is one more than that of the second pressing rollers, and the second pressing roller is located at the position of the air knife air outlet.

[0010] Further, a horizontal air cylinder is fixedly installed on the top of the mounting frame of the second pressing roller, the output end of the horizontal air cylinder is fixedly connected to the top of the mounting frame of the first pressing roller behind the second pressing roller, the mounting frame of the second pressing roller is fixedly installed on the side plate of the top machine shell, and the mounting frame of the first pressing roller is slidingly installed on the side plate of the top machine shell.

[0011] Further, a fixed groove rod is fixedly connected to the top of the mounting frame of the second pressing roller, the fixed groove rod is below one side edge of the wing surface baffle, the fixed groove rod is slidingly installed on the top of the mounting frame of the first pressing roller, a rotating rod is rotatably connected in the fixed groove rod, the rotating shaft of the rotating rod is above the first pressing roller, a blocking plate is fixedly connected to the bottom of the rotating rod, and the cross section of the rotating rod is in T shape.

[0012] Further, two inclined blocks are symmetrically fixed on the top of the mounting frame of the second pressing roller corresponding to the position of the fixed slot rod, when the mounting frame of the second pressing roller moves towards the first pressing roller, the inclined blocks are inserted between the T-shaped bottom of the rotating rod and the top of the fixed slot rod, and when the distance between the mounting frame of the second pressing roller and the first pressing roller is shortened, the inclined blocks gradually approach the rotating shaft of the rotating rod, forcing the rotating rod to tilt upward with an increased angle.

[0013] Further, the gradient cooling assembly further comprises a negative pressure drainage assembly on both sides of the lampshade cloth, the negative pressure drainage assembly comprises an air suction pipe connected with an external air source and air suction boxes on both sides of the lampshade cloth, the air suction box is in the shape of an isosceles trapezoid in cross section and is provided with two air suction grooves on the side facing the lampshade cloth, and a plurality of flow guide plates are obliquely arranged on one side of the air suction box.

[0014] Further, the two inclined sides of the air suction box are rotatably connected with rotating plates, the rotating shafts of the rotating plates are located in the middle of the rotating plates and are fixedly connected with small motors.

[0015] The technical scheme provided by the present application has the following beneficial effects compared with the known prior art: 1. The pressing assembly in the gradient cooling assembly can help to press the edge area of the lampshade cloth which has a temperature difference with the middle part of the lampshade cloth, thereby reducing the curling of the edge of the lampshade cloth, and the cooperating groove and protrusion in the pressing assembly will not have a great impact on the airflow, and the position of the first pressing roller and the second pressing roller can be changed to limit the airflow acting area, thereby concentrating the airflow and achieving a better cooling effect in a local area.

[0016] 2. The cooperation between the negative pressure drainage assembly and the first pressing roller and the second pressing roller, as well as the cooperation with the wing surface baffle, can increase the air suction effect when high-speed airflow is generated in the wing surface baffle area, and can reduce the generation of vortex, thereby ensuring the cooling effect of the airflow. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is an overall structural schematic diagram of the present application; Figure 2 It is an internal structural schematic diagram of the present application; Figure 3A schematic view of the gradient cooling assembly of the present application; Figure 4 A schematic view of the air knife of the present application; Figure 5 A schematic view of the pressing assembly of the present application; Figure 6 A schematic view of the structure at the first pressing roller of the present application; Figure 7 A schematic view of the structure at the second pressing roller of the present application; Figure 8 A schematic view of the structure at the fixed slot rod of the present application; Figure 9 A schematic view of the structure of the fixed slot rod and the rotating rod of the present application; Figure 10 A schematic view of the structure of the fixed slot rod and the rotating rod of the present application; Figure 11 A schematic view of the structure of the negative pressure drainage assembly of the present application.

[0019] The reference numbers in the figure respectively represent: 1, side machine shell; 2, top machine shell; 3, gradient cooling assembly; 4, gradient air knife assembly; 401, air knife; 402, wing surface baffle; 403, baffle motor; 5, pressing assembly; 501, mounting frame; 502, first pressing roller; 503, second pressing roller; 504, vertical air cylinder; 505, horizontal air cylinder; 506, fixed slot rod; 507, rotating rod; 508, inclined surface block; 509, blocking plate; 6, cooling roller; 7, negative pressure drainage assembly; 701, air suction pipe; 702, air suction box; 703, air suction slot; 704, flow guide plate; 705, rotating plate; 706, small motor. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings of the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0021] The present application will be further described below in connection with the embodiments.

[0022] Reference Figures 1 to 11 , Embodiment: A PVC lamp box cloth laminating machine, comprising a side machine shell 1 and a top machine shell 2, a heat press roller and a tension roller are installed in the side machine shell 1, after a cloth base with PVC slurry enters into the side machine shell 1, an extruder extrudes PVC onto the cloth base, a PVC surface film is formed after passing through the heat press roller, and the PVC lamp box cloth laminating machine further comprises a gradient cooling assembly 3 and a cooling roller 6 installed in the side machine shell 1; The gradient cooling assembly 3 comprises a gradient air knife assembly 4 and a pressing assembly 5 symmetrically distributed on the upper and lower parts of the light box cloth; The gradient air knife assembly 4 comprises a plurality of air knives 401 symmetrically distributed on the upper and lower parts, and the bottom air outlet of the air knife 401 is inclined towards the light box cloth; The pressing assembly 5 comprises a plurality of mounting frames 501 mounted on the side plates of the side cabinet 1 and vertical air cylinders 504 fixedly mounted on both sides of the mounting frame 501, the vertical air cylinders 504 acting on both ends of the first pressing roller 502 or the second pressing roller 503, the first pressing roller 502 or the second pressing roller 503 being mounted in the mounting frame 501, the circumferential side of the first pressing roller 502 being provided with a groove, and the circumferential side of the second pressing roller 503 being provided with a protrusion corresponding to the groove of the first pressing roller 502, for pressing the edge of the light box cloth; The cooling roller 6 is rotatably mounted in the side cabinet 1, and the light box cloth passes through the two cooling rollers 6 to complete the cooling.

[0023] The light box cloth is usually divided into three layers, the middle layer is the cloth base, the bottom layer is the PVC slurry layer, and the top layer is the PVC surface film, and the PVC surface film can be sprayed with patterns. In production, after the bottom of the cloth base is covered with PVC slurry, hot-melt PVC raw materials are coated above the cloth base through an extruding machine or related equipment, and after hot pressing by the hot roller in the side cabinet 1, the PVC surface film is formed. Before coating the PVC surface film, the cloth base and the PVC slurry should be preheated by infrared heating. The gradient cooling is performed after hot pressing, and the gradient cooling is performed to avoid curling of the light box cloth caused by rapid cooling.

[0024] The gradient cooling is performed by the gradient cooling assembly 3, the gradient cooling assembly 3 comprises a plurality of gradient air knife assemblies 4, the gradient air knife assemblies 4 are connected with the air source in a tilting manner to cool the upper and lower parts of the light box cloth, and the temperature sensor monitors the temperature of each position of the light box cloth at any time. When the temperature difference between the middle part and the edge position of the light box cloth is small, the first pressing roller 502 and the second pressing roller 503 are not in contact with the light box cloth. Due to the shape and position distribution of the light box cloth, when the air flow passes through the edge position of the light box cloth, the vortex is formed at the edge of the light box cloth. In the long-term cooling process, the edge position of the light box cloth cannot be cooled as much as the middle position under the influence of the vortex, so the temperature of the edge position of the light box cloth is higher than that of the middle position. At this time, the vertical air cylinder 504 provides pressure to move the first pressing roller 502 and the second pressing roller 503 of the upper and lower positions of the light box cloth, and the first pressing roller 502 and the second pressing roller 503 of the edge of the light box cloth are extruded to provide pressure support in the cooling process, and to reduce the curling of the edge of the light box cloth caused by temperature change. Correspondingly, the groove of the first pressing roller 502 and the protrusion of the second pressing roller 503 facilitate the flow of air flow and avoid being completely blocked, and the groove of the first pressing roller 502 and the protrusion of the second pressing roller 503 can be sequentially and completely rolled over the edge of the light box cloth to help reduce the curling degree of the edge of the light box cloth.

[0025] After passing through the gradient cooling assembly 3, the temperature of the light box cloth is gradually reduced, and after the light box cloth passes between the two cooling rollers 6, the cooling roller 6 is in contact with the light box cloth under the action of internal water cooling, and the temperature of the light box cloth is reduced to 25-30 DEG C, and then the temperature of the light box cloth is reduced to room temperature.

[0026] Specifically, the wing surface baffle 402 is rotationally connected to the both sides of the bottom air outlet of the air knife 401, the baffle motor 403 is fixedly installed on the both sides of the air knife 401, and the output end of the baffle motor 403 is connected with the wing surface baffle 402. The baffle motor 403 controls the angle of the wing surface baffle 402, and the wing surface baffle 402 covers the edge of the light box cloth.

[0027] The air knife 401 is approximately horizontal air, and the wing surface baffle 402 is distributed at the both side edges of the bottom of the air knife 401, corresponding to the both side edges of the light box cloth. When the temperature of the edge of the light box cloth is relatively high, the baffle motor 403 is started to control the rotation of the wing surface baffle 402, so that the air outlet of the air knife 401 at the position of the wing surface baffle 402 is reduced to reduce the air outlet and increase the wind speed. Correspondingly, under the action of large air volume, a stronger cooling effect can be generated on the edge of the light box cloth to make up for the insufficient cooling caused by the vortex.

[0028] Specifically, the first pressing rollers 502 are alternately distributed with the second pressing rollers 503, and the number of the first pressing rollers 502 is one more than that of the second pressing rollers 503, the second pressing rollers 503 are located at positions where the air outlets of the air knives 401 act, the top of the mounting frame 501 of the second pressing roller 503 is fixedly installed with a horizontal cylinder 505, the output end of the horizontal cylinder 505 is fixedly connected to the top of the mounting frame 501 of the first pressing roller 502 behind the second pressing roller 503, the mounting frame 501 of the second pressing roller 503 is fixedly installed on the side plate of the top shell 2, and the mounting frame 501 of the first pressing roller 502 is slidingly installed on the side plate of the top shell 2.

[0029] The mounting frame 501 at the top of the second pressing roller 503 is installed with a slide rod, the mounting frame 501 of the first pressing roller 502 slides on the slide rod, the first pressing roller 502 is close to the second pressing roller 503, which limits the effective area after the air knife 401 blows air, so that it is more difficult to diffuse after passing between the first pressing roller 502 and the second pressing roller 503, and the cooperation of the upper wing baffle 402 narrows the local air outlet of the air knife 401, and the first pressing roller 502 and the second pressing roller 503 are pressed, the wind force is more concentrated in the area between the first pressing roller 502 and the first pressing roller 502, and the pressure of the first pressing roller 502 and the second pressing roller 503 on the light box cloth can fully cool and press the edge of the light box cloth, thereby greatly reducing the curling of the edge of the light box cloth.

[0030] From the perspective of the first pressing roller 502 and the second pressing roller 503 after being close, the first pressing roller 502 and the second pressing roller 503 are in pairs, and the extra first pressing roller 502 is in front of the second pressing roller 503, cooperating with the protrusion of the second pressing roller 503, when the first pressing roller 502 and the second pressing roller 503 are not close, it plays a complete role in pressing the edge of the light box cloth, and correspondingly, during the time when the first pressing roller 502 and the second pressing roller 503 are close, the extra first pressing roller 502, i.e. the first pressing roller 502 in the front, is in a raised state to avoid excessive and insufficient pressing, and during the time when the first pressing roller 502 and the second pressing roller 503 are not close, the terminal first pressing roller 502 is in a raised state and does not contact the light box cloth, and correspondingly, it is also to avoid excessive and insufficient pressing.

[0031] Specifically, the top of the mounting frame 501 of the second pressing roller 503 is fixedly connected with a fixed slot rod 506, the fixed slot rod 506 is below one side edge of the wing baffle 402, the fixed slot rod 506 is slidingly installed on the top of the mounting frame 501 of the first pressing roller 502, the fixed slot rod 506 is rotatably connected with a rotating rod 507, the rotating shaft of the rotating rod 507 is above the first pressing roller 502, the bottom of the rotating rod 507 is fixedly connected with a blocking plate 509, the cross section of the rotating rod 507 is T-shaped, the top of the mounting frame 501 of the second pressing roller 503 is symmetrically fixedly installed with two inclined blocks 508 corresponding to the position of the fixed slot rod 506, when the mounting frame 501 of the second pressing roller 503 moves towards the first pressing roller 502, the inclined blocks 508 are inserted between the T-shaped bottom of the rotating rod 507 and the top of the fixed slot rod 506, and in the case that the distance between the mounting frame 501 of the second pressing roller 503 and the first pressing roller 502 is shortened, the inclined blocks 508 gradually approach the rotating shaft of the rotating rod 507, forcing the rotating rod 507 to tilt upwards with an increased angle.

[0032] When the first pressing roller 502 approaches the second pressing roller 503, the two inclined blocks 508 on the top of the mounting frame 501 of the second pressing roller 503 will be inserted between the T-shaped bottom of the rotating rod 507 and the top of the fixed slot rod 506, forcing the rotating rod 507 to rotate, accordingly, the rotating rod 507 and the first pressing roller 502 will be separated, and one end will be raised, so that the rotating rod 507 gradually approaches the bottom of the air knife 401, after the first pressing roller 502 and the second pressing roller 503 approach, the rotating rod 507 is completely lifted and located at the joint between the wing baffle 402 and the bottom of the air knife 401, using the lifted rotating rod 507, a separation area is formed between the bottom of the air knife 401 and the wing baffle 402, avoiding the influence of the high-speed airflow below the wing baffle 402, reducing the generation of vortex, accordingly, avoiding the generation of vortex between different airflows, ensuring the normal cooling process.

[0033] Specifically, the gradient cooling assembly 3 further comprises a negative pressure drainage assembly 7 on both sides of the light box cloth, the negative pressure drainage assembly 7 comprises an air suction pipe 701 connected with an external air source and an air suction box 702 on both sides of the light box cloth, the air suction box 702 is isosceles trapezoidal in cross section and is provided with two air suction grooves 703 on the side facing the light box cloth, a plurality of flow guide plates 704 are obliquely installed on one side of the air suction box 702, and rotating plates 705 are rotatably connected to both oblique sides of the air suction box 702, the rotating shaft of the rotating plate 705 is in the middle of the rotating plate 705 and is fixedly connected with a small motor 706.

[0034] The number of the negative pressure drainage assemblies 7 is the same as the number of the air knives 401 and one-to-one corresponding, the air suction box 702 is near the rear side of the second pressing roller 503, during the cooling process of the air knife 401, the air suction pipe 701 is connected with the external air source, through the negative pressure, and the air suction groove 703 on the air suction box 702, the air flow at the edge of the light box cloth is sucked into the air suction pipe 701 from the air suction groove 703, thereby reducing the vortex at the edge of the light box cloth, so that the edge of the light box cloth reduces the influence of the vortex, and the corresponding flow guide plate 704 cooperates with the inclined air outlet of the air suction pipe 701 to help guide the air flow, reduce the generation of vortex, and guide the air flow to be sucked into the air suction groove 703.

[0035] When the first pressing roller 502 and the second pressing roller 503 are close, due to the increase of the local air flow velocity of the airfoil baffle 402, a stronger vortex may be generated at the edge of the light box cloth, at this time, the small motor 706 is started to drive the rotating plate 705 to rotate and parallel to the air flow direction at the bottom of the air knife 401, so that the inclined surfaces on the upper and lower sides of the air suction box 702 are opened due to the rotation of the rotating plate 705, the air suction amount of the air suction pipe 701 is increased, and the inclined rotating plate 705 helps to guide the flow direction of the air flow, the air suction pipe 701 conducts the suction force to suck the turbulent air flow at the edge of the light box cloth from the air suction pipe 701, thereby stabilizing the flow direction of the air flow at this part, ensuring the cooling effect of the air flow, cooperating with the first pressing roller 502 and the second pressing roller 503 close to each other, helping the light box cloth in this area to be fully cooled, until the temperature at the edge of the light box cloth is close to or equal to the temperature at the middle part.

[0036] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A polyvinyl chloride (PVC) lightbox fabric laminating machine, comprising a side housing (1) and a top housing (2), wherein a hot press roller and a tension roller are installed inside the side housing (1), and a fabric base with PVC slurry at the bottom enters the side housing (1), and an extruder extrudes the PVC to the top of the fabric base, forming a PVC surface film after passing through the hot press roller, characterized in that, Also includes: Gradient cooling assembly (3) and cooling roller (6) installed in the side housing (1); The gradient cooling component (3) includes a gradient air knife component (4) and a pressing component (5) symmetrically distributed on the top and bottom of the light box cloth. The gradient air knife assembly (4) includes multiple air knives (401) symmetrically distributed vertically, with the bottom air outlet of the air knife (401) tilted towards the light box fabric; The pressing assembly (5) includes multiple mounting brackets (501) mounted on the side plate of the side housing (1). A first pressing roller (502) or a second pressing roller (503) is installed in the mounting bracket (501). The first pressing roller (502) has a groove on its circumferential side, and the second pressing roller (503) has a protrusion on its circumferential side that corresponds to the groove on the first pressing roller (502), which is used to press the edge of the light box cloth. Cooling rollers (6) are rotatably installed inside the side housing (1). The light box cloth passes through the two cooling rollers (6) to complete the cooling.

2. The polyvinyl chloride lightbox fabric laminating machine according to claim 1, characterized in that, The pressing assembly (5) also includes vertical cylinders (504) fixedly installed on both sides of the mounting frame (501), the vertical cylinders (504) acting on both ends of the first pressing roller (502) or the second pressing roller (503).

3. The polyvinyl chloride lightbox fabric laminating machine according to claim 1, characterized in that, Both sides of the bottom air outlet of the air knife (401) are rotatably connected to the wing baffle (402). The air knife (401) is fixedly installed with baffle motors (403) on both sides and the output end of the baffle motors (403) is connected to the wing baffle (402). The baffle motors (403) control the angle of the wing baffle (402) and the wing baffle (402) covers the top of the edge of the light box cloth.

4. A polyvinyl chloride lightbox fabric laminating machine according to claim 3, characterized in that, The first pressing roller (502) and the second pressing roller (503) are alternately distributed, and the number of the first pressing roller (502) is one more than the number of the second pressing roller (503). The second pressing roller (503) is located at the air outlet of the air knife (401).

5. A polyvinyl chloride lightbox fabric laminating machine according to claim 4, characterized in that, A horizontal cylinder (505) is fixedly installed on the top of the mounting bracket (501) of the second pressing roller (503). The output end of the horizontal cylinder (505) is fixedly connected to the top of the mounting bracket (501) of the first pressing roller (502) after the second pressing roller (503). The mounting bracket (501) of the second pressing roller (503) is fixedly installed on the side plate of the top housing (2), while the mounting bracket (501) of the first pressing roller (502) is slidably installed on the side plate of the top housing (2).

6. A polyvinyl chloride lightbox fabric laminating machine according to claim 5, characterized in that, A fixed groove rod (506) is fixedly connected to the top of the mounting bracket (501) of the second pressing roller (503). The fixed groove rod (506) is located below one side edge of the wing baffle (402). The fixed groove rod (506) is slidably installed on the top of the mounting bracket (501) of the first pressing roller (502). A rotating rod (507) is rotatably connected inside the fixed groove rod (506). The rotating shaft of the rotating rod (507) is located above the first pressing roller (502). A baffle plate (509) is fixedly connected to the bottom of the rotating rod (507). The cross-sectional shape of the rotating rod (507) is T-shaped.

7. A polyvinyl chloride lightbox fabric laminating machine according to claim 6, characterized in that, Two inclined blocks (508) are symmetrically fixed at the top of the mounting bracket (501) of the second pressing roller (503) corresponding to the position of the fixed groove rod (506). When the mounting bracket (501) of the second pressing roller (503) moves toward the first pressing roller (502), the inclined blocks (508) are inserted between the T-shaped bottom of the rotating rod (507) and the top of the fixed groove rod (506). As the distance between the mounting bracket (501) of the second pressing roller (503) and the first pressing roller (502) shortens, the inclined blocks (508) gradually approach the rotating shaft of the rotating rod (507), forcing the rotating rod (507) to tilt upward at an increased angle.

8. A polyvinyl chloride lightbox fabric laminating machine according to claim 7, characterized in that, The gradient cooling assembly (3) also includes a negative pressure drainage assembly (7) located on both sides of the light box cloth. The negative pressure drainage assembly (7) includes an air intake pipe (701) connected to an external air source and an air intake box (702) located on both sides of the light box cloth. The cross-sectional shape of the air intake box (702) is an isosceles trapezoid and two air intake slots (703) are opened on the side facing the light box cloth. Multiple guide plates (704) are installed obliquely on one side of the air intake box (702).

9. A polyvinyl chloride lightbox fabric laminating machine according to claim 8, characterized in that, The two inclined sides of the air intake box (702) are rotatably connected to a rotating plate (705), and the rotating shaft of the rotating plate (705) is located in the middle of the rotating plate (705) and is fixedly connected to a small motor (706).

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