Online film forming method and device for surface of gypsum plaster board

Abstract

The invention provides an online film forming method and device for the surface of a gypsum plaster board, and relates to the technical field of gypsum board production machinery, the online film forming device comprises a lower workbench and an upper workbench, outer paper folding rollers are installed in a groove in a shaft rotating mode, and the outer paper folding rollers on the two sides are matched with inner paper folding rollers correspondingly arranged on the same side respectively; bending roller frames are further installed on the portion, between the outer paper folding roller and the inner paper folding roller, of the upper workbench, the bending roller frames on the two sides are used for conducting secondary inward folding on the bent parts on the two sides of lower surface protection paper, and liquid injection holes are formed in the lower workbench in an array mode. As one part of a surface protecting paper bending mechanism, the surface protecting paper film forming device achieves film forming operation on the surface protecting paper and is further used for assisting in folding of the surface protecting paper, and the surface protecting paper film forming device is high in practicability and high in practicability. In addition, by adding the film liquid, wrinkles generated on the surface protecting paper in the folding process can be remarkably reduced, and then the forming quality of the surface protecting paper is improved.

Description

Technical Field

[0001] The invention relates to the technical field of gypsum board production machinery, and in particular to an online film-forming method and device on the surface of a paper-faced gypsum board. Background Art

[0002] The prior art discloses an online film-forming system for the surface of a paper-faced gypsum board with a publication number of "CN117984411A", which comprises: a coating device and a drying machine; the drying machine is used to dry the wet gypsum board; the coating device is used to coat the front of the lower face paper with an alkaline solution mixed with methyl hydrogen silicone oil before the wet gypsum board is dried. The alkaline solution mixed with methyl hydrogen silicone oil is coated on the front of the lower face paper, wherein there are multiple Si-H groups with active chemical properties, and then the wet gypsum board is dried. In the process of drying the paper-faced gypsum board under alkaline conditions, the unhydrolyzed Si-H continues to hydrolyze with the water molecules evaporated from the board core to form Si-OH, a part of Si-OH is combined with the face paper fiber to fix the hydrophobic group to the front of the gypsum board, and the other Si-OH forms a more stable -Si-O- covalent network through self-condensation to cover the front of the gypsum board, so that a hydrophobic film is formed on the front of the gypsum board.

[0003] However, the above-mentioned device still has obvious defects during use: the above-mentioned device is arranged in front of the scoring and folding mechanism of the face paper, and its function is only to perform film-forming operations on the surface of the face paper. Its function is relatively simple and the correlation between structures is not high, so its degree of integration is not high. At the same time, the above-mentioned film-forming method is used to perform film-forming operations on the bottom of the entire face paper. Since the face paper needs to be folded in the subsequent process, and the folded area does not need to be film-formed, the above-mentioned film-forming method will cause waste of film-forming raw materials. Summary of the invention

[0004] The object of the present invention is to provide an online film-forming method and device for the surface of a gypsum board, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: The folding rollers are used to fold the two sides of the lower face paper for secondary folding, so that the two ends of the lower face paper form an inner folding roller which is arranged on the upper workbench and the inner folding rollers are arranged on the lower workbench for secondary folding. A gap is formed between the bottom surface of the lower face paper and the upper surface of the lower workbench. In the lower workbench, injection holes are arranged in an array. The injection holes are connected to the injection pump through a confluence channel. The injection pump pumps film liquid into the injection holes to fill the gap between the lower face paper and the lower workbench. During the transmission of the lower face paper, the bottom of the lower face paper contacts with the film liquid, so that the film liquid is coated on one side of the bottom surface, thereby forming a bottom film at the bottom of the lower face paper. The upper workbench is also provided with an adhesive pumping pipe in the area between the bending roller frame and the enclosure block, through which adhesive is pumped to the outer folded parts at both ends of the lower face paper, thereby forming an adhesive film on the outer folded parts at both ends of the lower face paper.

[0006] Preferably, the adhesive pumping pipe is connected to an adhesive placement cabin fixedly installed on the upper workbench, and a one-way air inlet piston cylinder is installed on one side of the adhesive placement cabin. The piston arm of the one-way air inlet piston cylinder is connected to an eccentric shaft rotatably arranged on the same side, and the eccentric shaft is fixedly connected to the roller shaft of the inner paper folding roller on the same side. The rotation of the inner paper folding roller forces the gas to enter the adhesive placement cabin in one direction, and the air pressure in the adhesive placement cabin increases, so that the adhesive stored inside is pumped out through the adhesive pumping pipe and falls into the outer folded parts at both ends of the lower face paper.

[0007] Preferably, the enclosing blocks on both sides are located above the outer folding roller and are also provided with a liquid level control channel, and a first pump is also arranged on the liquid level control channel, and the first pump is also connected with the liquid collecting tank through the channel, and the liquid collecting tank is connected with the adhesive placement tank through a pipeline, and a second pump is also arranged on the pipeline between the liquid collecting tank and the adhesive placement tank.

[0008] Preferably, the lower workbench and the upper workbench are arranged after the lower face paper scoring machine of the gypsum board production line.

[0009] Preferably, the lower workbench, the upper workbench and the components connected thereto are used as part of the lower facing paper folding mechanism.

[0010] Preferably, a coating mechanism and a drying mechanism are further arranged at the rear end of the lower facing paper in the conveying direction of the outer folding roller and the inner folding roller, so that the film layer is made uniform and formed through the coating mechanism and the drying mechanism.

[0011] An on-line film forming method for the surface of a gypsum board comprises the following steps: Step 1: Convey the lower facing paper towards the side close to the lower workbench and the upper workbench. Before reaching the lower workbench and the upper workbench, form creases on the lower facing paper through the arranged crease line wheels. Step 2: Before reaching the lower workbench and the upper workbench, fold the lower facing paper along the crease line through the lower facing paper folding mechanism arranged at the front end, so that it forms a "U"-shaped cross section with the opening upward, and guide the upwardly folded part to be folded again and enter the bending roller frame, and clamp the inner and outer sides of both ends of the lower facing paper through the outer folding roller and the inner folding roller. Step 3: Pump the film liquid from the liquid injection hole into the separation gap through the liquid injection pump. During the conveying process of the lower facing paper, the bottom contacts the film liquid, so as to adhere to the bottom of the lower facing paper. At the same time, pump the adhesive to the outer folded parts at both ends of the lower facing paper through the adhesive pump injection pipe. Step 3: As the lower facing paper continues to be conveyed backward, the inner folded parts on both sides continue to be folded under the drive of the lower facing paper folding mechanism to form a vertical angle with the upwardly folded parts at both ends. At this time, the bottom film and the adhesive film are formed through the coating mechanism and the drying mechanism. Step 4: Uniformly pour liquid gypsum slurry into the folded and formed lower facing paper, and attach the upper facing paper to the opening side of the lower facing paper, so as to finally form a continuous gypsum board, which is formed after being cut in the later stage.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: As part of the facing paper folding mechanism, the present invention realizes the film forming operation on the facing paper on the one hand, and is also used to assist in folding the facing paper on the other hand. Moreover, the addition of the film liquid can significantly reduce the wrinkles generated on the facing paper during the crease folding process, thereby improving the forming quality of the facing paper and at the same time improving the integration degree of the device. Description of the Drawings

[0013] Figure 1 is a schematic cross-sectional view of the overall structure of the present invention; Figure 2 is a process flow chart of the forming of the facing board of the present invention; Figure 3 is a schematic diagram of the film forming position of the present invention.

[0014] In the figure: 1 lower workbench, 2 upper workbench, 3 retaining blocks, 4 grooves, 5 outer folding paper rollers, 6 inner folding paper rollers, 7 rotating shafts, 8 lower facing paper, 9 bending roller frames, 10 separation gap, 11 liquid injection holes, 12 confluence channels, 13 liquid injection pump, 14 bottom film, 15 adhesive pump injection pipe, 16 adhesive film, 17 adhesive placement chamber, 18 one-way air intake piston cylinder, 19 piston arm, 20 eccentric shaft, 21 liquid level control channel, 22 first pump, 23 liquid collection chamber, 24 second pump, 25 upper facing paper, 26 crease line wheel. Detailed implementation manner

[0015] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0016] Please refer to Figure 1-3 , the present invention provides a technical solution: Embodiment 1:

[0017] An on-line film forming device for the surface of gypsum board includes a lower workbench 1 and an upper workbench 2. Retaining blocks 3 are fixedly connected to both sides of the lower workbench 1. Grooves 4 are opened on one side of the retaining blocks 3 on both sides close to the lower workbench 1. Outer folding paper rollers 5 are rotatably installed in the grooves 4 by fixed shafts. The outer folding paper rollers 5 on both sides are respectively matched with the corresponding inner folding paper rollers 6 on the same side. The inner folding paper rollers 6 are fixedly installed on the upper workbench 2 through rotating shafts 7. The outer folding paper rollers 5 and the inner folding paper rollers 6 on both sides clamp both sides of the lower facing paper 8, so that the lower facing paper 8 forms a "U"-shaped cross-section with an upward opening. A bending roller frame 9 is also installed on the upper workbench 2 between the outer folding paper rollers 5 and the inner folding paper rollers 6. The bending roller frames 9 on both sides are used to perform secondary inner folding on the bent parts on both sides of the lower facing paper 8, so that both ends of the lower facing paper 8 form an inner folding angle in the range of 30° - 45° with the horizontal plane; A separation gap 10 is formed between the bottom surface of the lower facing paper 8 and the upper surface of the lower workbench 1. Liquid injection holes 11 are arranged in an array in the lower workbench 1. The liquid injection holes 11 are communicated with a liquid injection pump 13 through a confluence channel 12. The film liquid is pumped into the liquid injection holes 11 through the liquid injection pump 13, so as to fill the separation gap 10 between the lower facing paper 8 and the lower workbench 1. During the transmission of the lower facing paper 8, the bottom of the lower facing paper 8 contacts the film liquid, so as to coat the film liquid on one side of the bottom surface, thereby forming a bottom film 14 on the bottom of the lower facing paper 8; In the area where the upper workbench 2 is located between the bending roller frame 9 and the enclosing block 3, there is also an adhesive pump injection pipe 15. The adhesive is pumped through the adhesive pump injection pipe 15 to the outer folded parts at both ends of the lower facing paper 8, so as to form an adhesive film 16 at the outer folded parts at both ends of the lower facing paper 8.

[0018] In this embodiment, the lower workbench 1 and the upper workbench 2 are the main structures of the device. The lower workbench 1 and the upper workbench 2 are arranged behind the lower facing paper scoring machine of the gypsum board production line. Enclosing blocks 3 are installed on both sides of the lower workbench 1. Outer folding paper rollers 5 are arranged inside the enclosing blocks 3 on both sides. The outer folding paper rollers 5 also correspond and cooperate with the inner folding paper rollers 6 arranged on the same side. By clamping with the outer folding paper rollers 5 and the inner folding paper rollers 6 on both sides, the lower facing paper 8 forms a "U"-shaped cross-section with the opening facing upward. Among them, a bending roller frame 9 is also installed on the upper workbench 2 between the outer folding paper roller 5 and the inner folding paper roller 6. The bending roller frames 9 on both sides are used to perform secondary inner folding on the bent parts on both sides of the lower facing paper 8, so that the two ends of the lower facing paper 8 form an inner folding angle in the range of 30°-45° with the horizontal plane. This step is an essential step for the lower facing paper 8 to be folded from a planar state to a three-dimensional state. Therefore, this device is used as a part of the lower facing paper bending mechanism, but its function is not limited to folding the lower facing paper 8. A separation gap 10 is formed between the bottom surface of the lower facing paper 8 and the upper surface of the lower workbench 1. Liquid injection holes 11 are arranged in an array inside the lower workbench 1. During the transmission of the lower facing paper 8, the bottom of the lower facing paper 8 contacts with the film liquid, so as to coat the film liquid on one side of the bottom surface, and thus a bottom film 14 is formed at the bottom of the lower facing paper 8. Different from the prior art, this method of coating the film liquid does not need to cover the entire bottom surface of the lower facing paper 8, and only needs to coat the turned-up bottom surface, so it is more energy-saving and environmentally friendly than the traditional coating method. At the same time, since the upper surface of the upper turning structure of the lower facing paper 8 also needs to be adhesively bonded to the upper facing paper 25, the traditional production line also needs to coat an adhesive film layer at this position before bonding. Therefore, this device is also provided with an adhesive pump injection pipe 15. The adhesive is pumped through the adhesive pump injection pipe 15 to the outer folded parts at both ends of the lower facing paper 8, so as to form an adhesive film 16 at the outer folded parts at both ends of the lower facing paper 8. In addition, such a setting can also bring other benefits. In the prior art, in order to prevent wrinkles at the crease line position during the bending of the lower facing paper 8, an aqueous solution is rolled on the coating position of the adhesive film 16, so as to prevent wrinkles from being generated during the rolling process of the roller. And the application of the adhesive by pumping through the adhesive pump injection pipe 15 effectively solves the above problems, so that there is no need to set up corresponding structures at the transmission rear end. To sum up, the above device is used as a part of the facing paper bending mechanism, but further realizes the function of film formation, and the film formation process is energy-saving and environmentally friendly, and can further ensure the folding quality at the crease position, thus achieving more diverse technical effects, and the integration degree of the device is higher. Embodiment Two:

[0019] The adhesive pumping pipe 15 is connected to the adhesive placing cabin 17 fixedly installed on the upper workbench 2. A one-way air inlet piston cylinder 18 is installed on one side of the adhesive placing cabin 17. The piston arm 19 of the one-way air inlet piston cylinder 18 is connected to the eccentric shaft 20 set to rotate with a fixed axis on the same side. The eccentric shaft 20 is fixedly connected to the roller shaft of the inner paper folding roller 6 on the same side. The rotation of the inner paper folding roller 6 forces the gas to enter the adhesive placing cabin 17 in one direction. The air pressure in the adhesive placing cabin 17 increases, so that the adhesive stored inside is pumped out through the adhesive pumping pipe 15 and falls into the outer folding parts at both ends of the lower face paper 8.

[0020] In this embodiment, a pumping device of the adhesive pumping tube 15 is further disclosed. The interior of the adhesive pumping tube 15 is placed in a sealed state by means of the arrangement. The eccentric shaft 20 is driven to rotate during the rotation of the inner paper folding roller 6. The rotation of the eccentric shaft 20 drives the piston arm 19 of the one-way air inlet piston cylinder 18 to extend and retract. The structure of the one-way air inlet piston cylinder 18 is similar to the common air pump structure in the prior art. The adhesive placement chamber 17 is inflated by the extension and retraction movement of the piston arm 19. The air pressure in the adhesive placement chamber 17 increases, thereby pumping the adhesive stored inside out through the adhesive pumping tube 15. Embodiment three:

[0021] The enclosing blocks 3 on both sides are located above the outer paper folding roller 5 and are also provided with a liquid level control channel 21, on which a first pump 22 is also arranged, and the first pump 22 is also connected to a liquid collecting tank 23 through the channel, and the liquid collecting tank 23 is connected to the adhesive placement tank 17 through a pipeline, and a second pump 24 is also arranged on the pipeline between the liquid collecting tank 23 and the adhesive placement tank 17.

[0022] In this embodiment, the retaining blocks 3 on both sides are located above the outer paper folding roller 5 and are further provided with a liquid level control channel 21. The adhesive overflowing the liquid level control channel 21 will enter the liquid collecting tank 23 under the action of the first pump 22, thereby preventing excessive addition of adhesive. In addition, the adhesive collected in the liquid collecting tank 23 can also enter the adhesive placement tank 17 through the second pump 24, thereby preventing waste of adhesive. Embodiment 4:

[0023] The lower face paper 8 is located at the rear end of the outer folding roller 5 and the inner folding roller 6 in the conveying direction and is also provided with a coating mechanism and a drying mechanism, through which the film layer is made uniform and formed.

[0024] After applying the adhesive and film liquid, it is necessary to scrape the corresponding adhesion area of ​​the lower protective paper 8 with a scraper or a smear brush to make it more evenly distributed. At the same time, the drying mechanism is set to promote rapid film formation. The above device is a common structure in the prior art and will not be described in detail here.

[0025] An on-line film-forming method for the surface of a gypsum board on paper, comprising the following steps: Step 1: Convey the lower facing paper 8 towards the side close to the lower workbench 1 and the upper workbench 2. Before reaching the lower workbench 1 and the upper workbench 2, form a crease on the lower facing paper 8 through the provided crease line wheel 26; Step 2: Before reaching the lower workbench 1 and the upper workbench 2, fold the lower facing paper 8 along the crease line through the lower facing paper bending mechanism provided at the front end, so that it forms a "U"-shaped cross-section with the opening facing upwards, and guide the folded-up part to fold again and enter the bending roller frame 9, and clamp the inner and outer sides of both ends of the lower facing paper 8 through the outer folding paper roller 5 and the inner folding paper roller 6; Step 3: Pump the film liquid from the liquid injection hole 11 into the separation gap 10 through the liquid injection pump 13. The bottom of the lower facing paper 8 contacts the film liquid during the conveying process, so as to adhere to the bottom of the lower facing paper 8. At the same time, pump the adhesive through the adhesive pump injection pipe 15 to the outer folded parts at both ends of the lower facing paper 8; Step 3: As the lower facing paper 8 continues to be conveyed towards the rear end, the inner folded parts on both sides continue to fold under the drive of the lower facing paper bending mechanism so that they form a vertical angle with the parts folded upwards at both ends. At this time, the bottom film 14 and the adhesive film 16 are formed through the coating mechanism and the drying mechanism; Step 4: Uniformly pour the liquid gypsum slurry into the folded and formed lower facing paper 8, and attach the upper facing paper 25 to the opening side of the lower facing paper 8, so as to finally form a continuous gypsum board, which is formed after being cut in the later stage.

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An online film-forming device for the surface of a gypsum board, comprising a lower workbench and an upper workbench, characterized in that: On both sides of the lower workbench, there are fixedly connected baffle blocks. On the side of the two baffle blocks close to the lower workbench, grooves are opened. An outer folding paper roller is rotatably installed on a fixed shaft in the groove. The two outer folding paper rollers on both sides cooperate with the corresponding inner folding paper rollers on the same side. The inner folding paper rollers are fixedly installed on the upper workbench through rotating shafts. The two outer folding paper rollers and the inner folding paper rollers on both sides clamp both sides of the lower facing paper, so that the lower facing paper forms a "U"-shaped cross-section with an upward opening. A bending roller frame is also installed between the outer folding paper roller and the inner folding paper roller on the upper workbench. The two bending roller frames are used to perform secondary inner folding on the bent parts on both sides of the lower facing paper, so that the two ends of the lower facing paper form an inner folding angle in the range of 30°-45° with the horizontal plane. A separated gap is formed between the bottom surface of the lower facing paper and the upper surface of the lower workbench. The lower workbench is provided with injection holes arranged in an array. The injection holes are communicated with an injection pump through a confluence channel. The injection pump pumps film liquid into the injection holes, so as to fill the separated gap between the lower facing paper and the lower workbench. During the transmission of the lower facing paper, the bottom of the lower facing paper contacts with the film liquid and coats the film liquid on one side of the bottom surface, so as to form a bottom film at the bottom of the lower facing paper. An adhesive pump injection pipe is also arranged in the area between the bending roller frame and the baffle block on the upper workbench. The adhesive pump injection pipe pumps adhesive to the outer folded parts at both ends of the lower facing paper, so as to form an adhesive film on the outer folded parts at both ends of the lower facing paper.

2. The on-line film-forming device for the surface of a gypsum board according to claim 1, characterized in that: The adhesive pump injection pipe is communicated with an adhesive placement chamber fixedly installed on the upper workbench. A one-way intake piston cylinder is installed on one side of the adhesive placement chamber. The piston arm of the one-way intake piston cylinder is connected with an eccentric shaft rotatably arranged on a fixed shaft on the same side. The eccentric shaft is fixedly connected with the roller shaft of the inner folding paper roller on the same side. By the rotation of the inner folding paper roller, gas is forced to enter the adhesive placement chamber unidirectionally. The air pressure in the adhesive placement chamber increases, so that the stored adhesive inside is pumped outwards through the adhesive pump injection pipe and falls on the outer folded parts at both ends of the lower facing paper.

3. An online film-forming device for the surface of a gypsum board according to claim 1 or 2, characterized in that: On both sides of the baffle blocks above the outer folding paper rollers, liquid level control channels are opened. A first pump is also arranged on the liquid level control channel. The first pump is also communicated with a liquid collection chamber through a channel. The liquid collection chamber is communicated with the adhesive placement chamber through a pipeline. A second pump is also arranged on the pipeline between the liquid collection chamber and the adhesive placement chamber.

4. The on-line film-forming device for the surface of a gypsum board according to claim 3, characterized in that: The lower workbench and the upper workbench are arranged after the lower facing paper creasing machine of the gypsum board production line.

5. The on-line film-forming device for the surface of a gypsum board according to claim 4, characterized in that: The lower workbench, the upper workbench and the components connected thereto are used as part of the lower facing paper bending mechanism.

6. The on-line film-forming device for the surface of a gypsum board according to claim 1, characterized in that: At the rear end of the lower facing paper in the transmission direction of the outer folding paper roller and the inner folding paper roller, a coating mechanism and a drying mechanism are also arranged. The film layer is made uniform and formed through the coating mechanism and the drying mechanism.

7. A method for forming a film on the surface of a gypsum board online, using the device for forming a film on the surface of a gypsum board as claimed in claim 6, characterized in that: Including the following steps: Step 1: Transmit the lower facing paper towards the side close to the lower workbench and the upper workbench. Before reaching the lower workbench and the upper workbench, creases are formed on the lower facing paper through the arranged crease line wheels. Step 2: Before reaching the lower workbench and the upper workbench, the lower facing paper is folded along the crease line by the lower facing paper folding mechanism provided at the front end, so that it forms a "凵"-shaped cross-section with the opening facing upward, and the folded upward part is guided to be folded again and enter the bending roller frame, and the inner and outer sides of both ends of the lower facing paper are clamped by the outer folding paper roller and the inner folding paper roller; Step 3: The film liquid is pumped into the separation gap from the liquid injection hole by the liquid injection pump. During the transmission process, the bottom of the lower facing paper contacts the film liquid, so that it adheres to the bottom of the lower facing paper. At the same time, the adhesive is pumped into the outer folded parts at both ends of the lower facing paper through the adhesive pump injection pipe; Step 3: As the lower facing paper continues to be transmitted backward, the inner folded parts on both sides are continuously folded under the drive of the lower facing paper folding mechanism to form a vertical angle with the upward folded parts at both ends. At this time, the bottom film and the adhesive film are formed by the coating mechanism and the drying mechanism; Step 4: Liquid gypsum slurry is evenly poured into the bent and formed lower facing paper, and the upper facing paper is attached to the opening side of the lower facing paper, so as to finally form a continuous gypsum board, which is formed after later cutting.

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