Gypsum board covering paper pre-expansion device

Abstract

The invention relates to the technical field of gypsum board production equipment, in particular to a gypsum board covering paper pre-expansion device which comprises a frame body, a conveying assembly and a spraying assembly, and the conveying assembly is arranged on the frame body and used for conveying covering paper; the multiple spraying assemblies are arranged on the frame body and arranged along the conveying path of the conveying assembly at intervals, each spraying assembly is correspondingly provided with a spraying section on the conveying path, and an expansion section is arranged between every two adjacent spraying sections. Through multiple groups of spraying sections and expansion sections, a small amount of water mist can permeate into the lining of the surface protection paper from the surface of the surface protection paper for multiple times, so that the inner layer and outer layer structures of the surface protection paper can be uniformly expanded, and the surface of the surface protection paper is prevented from being excessively expanded; therefore, layered bubbles on the gypsum board surface after the surface protection paper with the excessively-expanded surface enters a gypsum board production line are avoided, the qualified rate of the gypsum board is increased, and the overall appearance of the gypsum board is improved.

Description

Technical Field

[0001] The present application relates to the technical field of gypsum board production equipment, and in particular to a gypsum board facing paper pre-expansion device. Background Art

[0002] Gypsum board is an important material made of building gypsum as the main raw material. It is a building material with good sound insulation, heat insulation and fire resistance and other properties. It is one of the new lightweight panels that are currently being developed. The existing gypsum board structure is mostly upper face paper, slurry and lower face paper.

[0003] During the production process of paper-faced gypsum board, the upper and lower layers of facing paper will have a certain lateral expansion after absorbing water in contact with the slurry. Because the lower facing paper will be in direct contact with the conveyor belt, the wet expansion speeds of the upper and lower facing papers are not consistent. The wet expansion speed of the lower facing paper will be slower than that of the upper facing paper. When the water absorption expansion coefficients of the upper and lower papers do not match, it is easy to cause warping and bulging problems. At the same time, when the water absorption expansion amount is too large, it is easy to generate lateral stress, thereby destroying the gypsum crystals and causing stratified bubbles on the board surface. Summary of the invention

[0004] The present application provides a gypsum board face paper pre-expansion device, which is used to solve the problem in the prior art that the water absorption expansion coefficients of the upper face paper and the lower face paper on the gypsum board are inconsistent, resulting in warping, bulging and layered bubbles on the board surface.

[0005] The present application provides a gypsum board facing paper pre-expansion device, comprising:

[0006] Frame;

[0007] A conveying assembly is arranged on the frame and is used for conveying the face paper;

[0008] There are multiple spray assemblies arranged on the frame. The multiple spray assemblies are arranged at intervals along the conveying path of the conveying assembly. Each spray assembly has a corresponding spray section on the conveying path, and an expansion section is provided between two adjacent spray sections.

[0009] In a possible design, a plurality of spray assemblies are spaced apart on both sides of the face paper to spray the two sides of the face paper respectively.

[0010] In one possible design, the transmission assembly includes:

[0011] There are multiple first transmission rollers, and the multiple first transmission rollers are arranged at intervals on the top of the frame;

[0012] There are multiple second conveying rollers, which are arranged at intervals at the bottom of the frame, and the orthographic projections of the second conveying rollers on a preset plane are arranged at intervals from the orthographic projections of the first conveying rollers on the preset plane, and the preset plane is a plane perpendicular to the height direction of the frame;

[0013] The face paper is passed around the first conveying roller and the second conveying roller in sequence.

[0014] In a possible design, the spray assembly is disposed close to the first conveyor roller / the second conveyor roller, respectively, and the outer roller surfaces of the first conveyor roller and the second conveyor roller respectively form spray sections; the connecting lines of the adjacent first conveyor roller and the second conveyor roller respectively form the expansion sections.

[0015] In a possible design, a central cavity is formed inside the first conveying roller and the second conveying roller respectively, and a water-permeable hole is opened on the first conveying roller and the second conveying roller respectively, and the water-permeable hole is connected to the central cavity; the spray assembly is respectively arranged in the corresponding central cavity.

[0016] In one possible design, the spray assembly includes:

[0017] The branch pipe is arranged in the central cavity and extends along the length direction of the central cavity. The branch pipe is provided with a mounting hole;

[0018] An atomizing nozzle is installed at the installation hole, and the atomizing nozzle faces the side of the first conveying roller / the second conveying roller around which the protective paper is wound.

[0019] In one possible design, it also includes:

[0020] The first wind knife is installed on the frame, corresponding to the position close to the end of the conveying path, and is located on one side of the face paper;

[0021] The second wind knife is installed on the frame, corresponds to the end position of the conveying path, is located on the other side of the face paper, and is arranged opposite to the first wind knife.

[0022] In a possible design, the air outlet directions of the first wind knife and the second wind knife respectively form an angle with the face paper.

[0023] In a possible design, a paper surface humidity sensor is also included. The paper surface humidity sensor is arranged on the frame, corresponding to a position close to the end of the conveying path, and is used to detect the humidity of the cover paper.

[0024] In one possible design, it also includes:

[0025] The water storage tank is arranged on the top of the frame and has a water supply port and a water return port;

[0026] A water supply pipe, one end of which is connected to the water supply port, and the other end of which is connected to the spray assembly;

[0027] A return water pool is arranged at the bottom of the frame;

[0028] A return pipe, one end of which is connected to the return tank, and the other end of which is connected to the return port.

[0029] The beneficial effects of this application are as follows:

[0030] The gypsum board facing paper pre-expansion device of the present application arranges multiple spray components at intervals along the conveying path of the transmission component, so that each spray component corresponds to a spray section on the conveying path, and an expansion section is provided between two adjacent spray sections, so that the facing paper can pass through each spray section and expansion section in sequence during the pre-expansion process, and the surface of the facing paper is sprayed with water mist in the process of passing through the spray section, and the water mist on the surface of the facing paper penetrates into the inner layer of the facing paper from the surface to the inside in a timely manner during the process of passing through the expansion section; by arranging multiple groups of spray sections and expansion sections, it is possible to achieve that water mist penetrates from the surface of the facing paper into the inside of the facing paper in small amounts and multiple times, which is beneficial to maintaining uniform expansion of the inner and outer layer structures of the facing paper, preventing excessive expansion of the surface of the facing paper, thereby avoiding the appearance of stratified bubbles on the gypsum board surface after the facing paper with excessively expanded surface enters the gypsum board production line, which is beneficial to improving the qualified rate of gypsum boards and improving the overall appearance of gypsum boards. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 Schematic diagram of the structure of the gypsum board face paper pre-expansion device provided in the embodiment of the present application Figure 1 ;

[0033] Figure 2 Schematic diagram of the structure of the gypsum board face paper pre-expansion device provided in the embodiment of the present application Figure 2 ;

[0034] Figure 3 A left view of a gypsum board facing paper pre-expansion device provided in an embodiment of the present application;

[0035] Figure 4 A right side view of a gypsum board facing paper pre-expansion device provided in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of the structure of a first conveying roller and a second conveying roller of a gypsum board facing paper pre-expansion device provided in an embodiment of the present application;

[0037] Figure 6 Schematic diagram of the structure of the spray assembly of the gypsum board face paper pre-expansion device provided in the embodiment of the present application Figure 1 ;

[0038] Figure 7 Schematic diagram of the structure of the spray assembly of the gypsum board face paper pre-expansion device provided in the embodiment of the present application Figure 2 .

[0039] Reference numerals:

[0040] 100, frame; 110, paper inlet; 120, paper outlet; 130, exhaust outlet; 200, conveying assembly; 210, first conveying roller; 211, central cavity; 212, water permeable hole; 220, second conveying roller; 300, spray assembly; 310, branch pipe; 320, atomizing nozzle; 410, first air knife; 420, second air knife; 500, paper surface humidity sensor; 610, water storage tank; 620, water supply pipe; 630, return water tank; 640, return water pipe; 650, water pump; 700, guide roller; 800, face paper. DETAILED DESCRIPTION

[0041] The technical solution of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0042] Combine the following Figure 1-Figure 7 , describing the gypsum board facing paper pre-expansion device provided in the embodiments of the present application.

[0043] Reference Figure 1 As shown, the embodiment of the present application provides a gypsum board face paper pre-expansion device, including a frame 100, a conveying assembly 200 and a spray assembly 300, wherein the conveying assembly 200 is mounted on the frame 100, the conveying assembly 200 is a belt roller or a conveyor belt, the face paper 800 is wound around the belt roller or laid on the conveyor belt, and the belt roller or the conveyor belt conveys the face paper downstream under the drive of the driving motor; there are multiple spray assemblies 300, which are respectively mounted on the frame 100, and the multiple spray assemblies 300 are arranged at intervals along the conveying path of the conveying assembly 200, and each spray assembly 300 corresponds to a spray section on the conveying path, and there is an expansion section between two adjacent spray sections. Specifically, the face paper in the spray section can be sprayed with water mist by the spray assembly 300, and the face paper in the expansion section cannot be sprayed with water mist by the spray assembly 300; in some specific embodiments, the length of the expansion section is greater than the length of the spray section, so as to ensure that the face paper can fully penetrate the surface moisture into the inner layer in the expansion section.

[0044] By utilizing the technical solution in the above-mentioned embodiment, multiple spray assemblies 300 are arranged at intervals along the conveying path of the transmission assembly 200, so that each spray assembly 300 has a corresponding spray section on the conveying path, and an expansion section is provided between two adjacent spray sections, so that the facing paper 800 can pass through each spray section and expansion section in sequence during the pre-expansion process, and the surface of the facing paper is sprayed with water mist in the process of passing through the spray section, and the water mist on the surface of the facing paper 800 penetrates into the inner layer of the facing paper from the surface to the inside in a timely manner in the process of passing through the expansion section; by arranging multiple groups of spray sections and expansion sections, it is possible to achieve a small amount of water mist penetrating from the surface of the facing paper into the inside of the facing paper multiple times, which is beneficial to keep the inner and outer layer structures of the facing paper uniformly expanded, prevent the surface of the facing paper from being excessively expanded, thereby avoiding the occurrence of stratified bubbles on the gypsum board surface after the facing paper with excessively expanded surface enters the gypsum board production line, which is beneficial to improving the qualified rate of the gypsum board and improving the overall appearance of the gypsum board.

[0045] In some embodiments provided in the present application, a plurality of spray assemblies 300 are arranged at intervals on both sides of the face paper, respectively, for spraying the two sides of the face paper respectively. Specifically, the previous spray assembly 300 is arranged on the upper side of the face paper, and the next spray assembly 300 is arranged on the lower side of the face paper, so that it is conducive to spraying water evenly on the upper and lower surfaces of the face paper. At the same time, the water on the upper and lower surfaces of the face paper can penetrate into the inside of the face paper respectively, which is conducive to improving the penetration efficiency of the face paper, improving the expansion effect, and preventing one side of the face paper from over-expanding.

[0046] Reference Figure 1As shown, in some embodiments provided in the present application, the conveying assembly 200 includes a first conveying roller 210 and a second conveying roller 220, and there are multiple first conveying rollers 210, and the multiple first conveying rollers are arranged at intervals on the top of the frame 100; there are multiple second conveying rollers 220, and the multiple second conveying rollers 220 are arranged at intervals on the bottom of the frame 100, and the orthographic projection of the second conveying roller 220 on the preset plane is arranged at intervals with the orthographic projection of the first conveying roller 210 on the preset plane, and the preset plane is a plane perpendicular to the height direction of the frame 100; the face paper passes around the first conveying roller 210 and the second conveying roller 220 in turn. In some specific embodiments, the roller shaft of the first transmission roller is installed at the top of the frame 100 along the width direction of the frame 100, the roller shaft of the second transmission shaft is installed at the bottom of the frame 100 along the width direction of the frame 100, the diameters of the first transmission roller and the second transmission roller 220 are equal, the roller shafts of all the first transmission rollers are connected by gear transmission, the roller shafts of all the second transmission rollers are connected by wheel transmission, one of the first transmission rollers is connected to one of the second transmission rollers by gear transmission, the driving motor is connected to the first transmission roller or the second transmission roller, and the driving motor can drive the first transmission roller and the second transmission roller to rotate synchronously. In this way, by allowing the face paper to pass up and down on the first transmission roller 210 and the second transmission roller 220 in sequence, it is beneficial to increase the length of the face paper in the frame 100 and extend the total time of the face paper passing through the frame 100, thereby reducing the total length of the frame 100, making the device more compact and saving space.

[0047] Reference Figure 1 As shown, the spray assembly 300 is respectively arranged near the first conveying roller 210 / the second conveying roller 220, and the outer roller surfaces of the first conveying roller 210 and the second conveying roller 220 respectively form spray sections; the lines connecting the adjacent first conveying rollers 210 and the second conveying rollers 220 respectively form expansion sections. In some specific embodiments, the spray assembly 300 is respectively arranged at the top and the bottom of the frame 100, the spray assembly 300 at the top of the frame 100 is located directly above the first transfer roller, and the spray assembly 300 at the bottom of the frame 100 is located directly below the second conveying roller 220. By arranging the spray assembly 300 directly above the first conveying roller 210 or directly below the second conveying roller 220, one of the spray sections corresponds to Figure 1 In the area between the middle straight line L2 and the straight line L3, one of the expansion segments corresponds to Figure 1 The area between the middle straight line L1 and the straight line L2 is beneficial to reducing the coverage area of ​​each spray section on the face paper, and is also beneficial to increasing the length of the expansion section, so that the face paper can fully penetrate the surface moisture into the inner layer in the expansion section.

[0048] Reference Figure 1As shown, in some specific embodiments, the lateral wheelbase between the adjacent first conveying roller 210 and the second conveying roller 220 is greater than the diameter of the first conveying roller 210. At this time, the orthographic projection of the second conveying roller 220 on the plane perpendicular to the height direction of the frame 100 and the orthographic projection of the first conveying roller 210 on the plane perpendicular to the height direction of the frame 100 have no intersection area. In this way, the orthographic projections of each paper segment of the face paper on the plane perpendicular to the height direction of the frame 100 can be made to have no intersection, which is conducive to reducing the coverage area of ​​the face paper by each spraying section, so as to increase the length of the expansion section, so that the face paper can fully penetrate the surface moisture into the inner layer in the expansion section.

[0049] Reference Figure 2 As shown, in some specific embodiments, the lateral wheelbase between adjacent first conveying rollers 210 and second conveying rollers 220 is less than or equal to the diameter of the first conveying roller 210. At this time, the orthographic projection of the second conveying roller 220 on the plane perpendicular to the height direction of the frame 100 and the orthographic projection of the first conveying roller 210 on the plane perpendicular to the height direction of the frame 100 have an intersection area. In this way, it is beneficial to further reduce the total length of the frame 100, make the device more compact, and save space, but it will increase the coverage area of ​​each spray section on the face paper to a certain extent.

[0050] In order to further reduce the coverage area of ​​each spray section on the face paper. Figure 1 , Figure 2 , Figure 5 As shown, in some embodiments of the present application, a central cavity 211 is formed inside the first conveying roller 210 and the second conveying roller 220, and a water-permeable hole 212 is opened on the first conveying roller 210 and the second conveying roller 220, respectively, and the water-permeable hole 212 is connected to the central cavity 211; the spray assembly 300 is respectively arranged in the corresponding central cavity 211. In this way, the spray assembly 300 sprays water mist from the central cavity 211 onto the face paper, so that no matter whether the lateral wheelbase between the adjacent first conveying rollers 210 and the second conveying rollers 220 is less than, equal to, or greater than the diameter of the first conveying roller 210, it can be ensured that each spray section has a small coverage area on the face paper.

[0051] Reference Figure 6 , Figure 7As shown, in some embodiments of the present application, each spray assembly 300 includes a branch pipe 310 and an atomizing nozzle 320, respectively. The branch pipe 310 is arranged in the central cavity 211, and the branch pipe 310 extends along the length direction of the central cavity 211. A mounting hole is opened on the branch pipe 310; the atomizing nozzle 320 is installed at the mounting hole, and the atomizing nozzle 320 faces the side of the first conveying roller 210 / the second conveying roller 220 around which the protective paper is wrapped. In some specific embodiments, a roller shaft is installed at one end of the first conveying roller 210 and the second conveying roller 220, and a tube hole is opened at the other end, and the branch pipe 310 penetrates into the central cavity 211 from the tube hole, wherein the mounting hole of the branch pipe 310 in the first conveying roller 210 is set upward, and the atomizing nozzle 320 is correspondingly installed at the upper part of the branch pipe 310, and the mounting hole of the branch pipe 310 in the second conveying roller 220 is set downward, and the atomizing nozzle 320 is correspondingly installed at the lower part of the branch pipe 310, and the atomizing nozzle 320 is respectively along the corresponding The branch pipe 310 is arranged radially, so that the direction of the water mist sprayed from the atomizing nozzle 320 is sprayed from the water-permeable holes 212 on the first conveying roller 210 and the second conveying roller 220 along the radial direction of the branch pipe 310, so that the direction of the water mist sprayed from the atomizing nozzle 320 is perpendicular to the face paper wound around the first conveying roller 210 and the second conveying roller 220, which is conducive to the water mist penetrating into the interior of the face paper from the surface to the inside along the direction perpendicular to the face paper, thereby preventing the water mist from excessively accumulating on the surface of the face paper to cause excessive expansion.

[0052] Reference Figure 1As shown, in some embodiments of the present application, the gypsum board face paper pre-expansion device further includes a first wind knife 410 and a second wind knife 420. The first wind knife 410 is mounted on the frame 100, corresponding to the position close to the end of the conveying path, and is located on one side of the face paper; the second wind knife 420 is mounted on the frame 100, corresponding to the end position of the conveying path, and is located on the other side of the face paper, and is arranged opposite to the first wind knife 410. In some specific embodiments, the gypsum board face paper pre-expansion device further includes a guide roller 700, which is mounted on the frame 100. The face paper wound from the last second conveying roller 220 is wound around the guide roller 700 again. The face paper between the guide roller 700 and the second conveying roller 220 is arranged vertically, the first wind knife 410 is located on the left side of the face paper, and the second wind knife 420 is located on the right side of the face paper. In this way, the first wind knife 410 and the second wind knife 420 blow air to the face paper at the same time, so that the surface of the face paper after pre-expansion can be kept flat. Specifically, the first wind knife 410 and the second wind knife 420 are respectively arranged obliquely downward, and the air outlet directions of the first wind knife 410 and the second wind knife 420 respectively form an angle with the face paper, for example, the angle is 30 degrees, and by blowing in the direction opposite to the conveying direction of the face paper, it is helpful to improve the effect of airflow leveling the face paper. In some specific embodiments, the frame 100 is a box body, and a paper inlet 110, a paper outlet 120 and an exhaust port 130 are opened on the box body. The face paper enters the box body from the paper inlet 110, and the expanded face paper is guided out of the box body from the paper outlet 120, and the air flow is discharged from the exhaust port 130.

[0053] Reference Figure 1 As shown, in some embodiments of the present application, the gypsum board face paper pre-expansion device further includes a paper surface humidity sensor 500, which is disposed on the frame 100, corresponding to a position close to the end of the conveying path, and the paper surface humidity sensor 500 can contact the face paper to detect the humidity of the face paper. The water mist size of the atomizing nozzle 320 can be adjusted in time according to the detection result of the paper surface humidity sensor 500.

[0054] Reference Figure 3 , Figure 4As shown, in some embodiments of the present application, the gypsum board facing paper pre-expansion device also includes a water tank 610, a water supply pipe 620, a return water tank 630 and a return water pipe 640, the water tank 610 is arranged at the top of the frame 100, and has a water supply port and a return water port; one end of the water supply pipe 620 is connected to the water supply port, and the other end is connected to the spray assembly 300; the return water tank 630 is arranged at the bottom of the frame 100; one end of the return water pipe 640 is connected to the return water tank 630, and the other end is connected to the return water port. Specifically, water pumps 650 are installed on the water supply pipe 620 and the return pipe 640 respectively. The water supply pipe 620 is connected with each branch pipe 310. The water in the water storage tank 610 reaches each branch pipe 310 through the water supply pipe 620 and is sprayed out from the atomizing nozzle 320. Part of the water sprayed from the atomizing nozzle 320 is absorbed by the facial paper, and part of it falls into the return water pool 630. The water in the return water pool 630 flows back to the water storage tank 610 again through the return water pipe 640, thereby realizing the recycling of water resources.

[0055] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A gypsum board facing paper pre-expansion device, characterized in that: include: Frame; A conveying assembly, disposed on the frame, for conveying the face paper; There are multiple spray assemblies, which are arranged on the frame. The multiple spray assemblies are arranged at intervals along the conveying path of the transmission assembly. Each of the spray assemblies corresponds to a spray section on the conveying path, and an expansion section is provided between two adjacent spray sections.

2. The gypsum board facing paper pre-expansion device according to claim 1, characterized in that: The plurality of spray assemblies are respectively arranged at intervals on both sides of the face paper, and are used to spray the two side surfaces of the face paper respectively.

3. The gypsum board facing paper pre-expansion device according to claim 2, characterized in that: The transmission component comprises: There are a plurality of first transmission rollers, and the plurality of first transmission rollers are arranged at intervals on the top of the frame; There are multiple second conveying rollers, and the multiple second conveying rollers are arranged at intervals at the bottom of the frame. The orthographic projection of the second conveying roller on a preset plane is arranged at intervals with the orthographic projection of the first conveying roller on the preset plane. The preset plane is a plane perpendicular to the height direction of the frame; The face paper is passed around the first conveying roller and the second conveying roller in sequence.

4. The gypsum board facing paper pre-expansion device according to claim 3, characterized in that: The spray assembly is respectively arranged close to the first conveying roller / the second conveying roller, and the outer roller surfaces of the first conveying roller and the second conveying roller respectively form the spray section; the connecting line of the adjacent first conveying roller and the second conveying roller respectively forms the expansion section.

5. The gypsum board facing paper pre-expansion device according to claim 4, characterized in that: The first conveying roller and the second conveying roller respectively have central cavities formed therein, and the first conveying roller and the second conveying roller respectively have water holes opened thereon, and the water holes are connected to the central cavities; the spraying components are respectively arranged in the corresponding central cavities.

6. The gypsum board facing paper pre-expansion device according to claim 5, characterized in that: The spray assembly comprises: A branch pipe is arranged in the central cavity and extends along the length direction of the central cavity, and a mounting hole is opened on the branch pipe; An atomizing nozzle is installed at the installation hole, and the atomizing nozzle faces the side of the first conveying roller / the second conveying roller around which the face paper is wound.

7. The gypsum board facing paper pre-expansion device according to any one of claims 1 to 6, characterized in that: Also includes: A first wind knife is installed on the frame, corresponding to a position close to the end of the conveying path, and is located on one side of the face paper; The second wind knife is installed on the frame, corresponds to the end position of the conveying path, is located on the other side of the face paper, and is arranged opposite to the first wind knife.

8. The gypsum board facing paper pre-expansion device according to claim 7, characterized in that: The air outlet directions of the first air knife and the second air knife respectively form an angle with the face paper.

9. The gypsum board facing paper pre-expansion device according to any one of claims 1 to 6, characterized in that: It also includes a paper surface humidity sensor, which is arranged on the frame, corresponding to a position close to the end of the conveying path, and is used to detect the humidity of the cover paper.

10. The gypsum board facing paper pre-expansion device according to any one of claims 1 to 6, characterized in that: Also includes: A water storage tank is arranged on the top of the frame and has a water supply port and a water return port; A water supply pipe, one end of which is connected to the water supply port, and the other end of which is connected to the spray assembly; A return water tank is arranged at the bottom of the frame; A water return pipe has one end connected to the water return tank and the other end connected to the water return port.

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