Hard block removing device and gypsum board production system

Abstract

The utility model provides a hard lump removing device and a gypsum board production system. The hard block removing device comprises a pair of scraper assemblies, the pair of scraper assemblies are suitable for being arranged adjacent to the two ends of the slurry laying roller at the downstream of the slurry laying roller, and each scraper assembly comprises a mounting frame suitable for being mounted to a conveying device of the gypsum board production system; and the scraper is attached to the mounting frame, is parallel to the surface protection paper and is arranged to extend out of the surface protection paper from the position above the surface protection paper at an angle relative to the conveying direction of the surface protection paper, so that the orthographic projection area of the scraper on the surface protection paper covers the area where the slurry flowing through the two ends of the slurry spreading roller flows. According to the hard lump removing device, the scraper assembly is arranged on the downstream portion of the slurry spreading roller, hard lumps, gathered at the two ends of the slurry spreading roller after flowing through the slurry spreading roller, in the slurry are effectively removed out of surface protection paper (a production line), adverse effects such as surface protection paper breaking in the follow-up production process are avoided, and smooth implementation of gypsum board production is guaranteed.

Description

Technical Field

[0001] This disclosure relates to the field of gypsum board production technology, and more specifically, to a lump removal device for removing lumps from the slurry downstream of the slurry spreading device during the production of paper-faced gypsum board, and a gypsum board production system using the lump removal device. Background Technology

[0002] Gypsum board is a material made primarily of building gypsum. Paper-faced gypsum board, on the other hand, is a lightweight board made with gypsum slurry as the core and paper as the facing on both sides. It features light weight, sound insulation, heat insulation, strong processing performance, and simple construction methods. With consumers' increasing functional demands for gypsum board, some gypsum board products now include two types of slurry in the gypsum core. This means that during the transfer of the facing paper, a slurry mixer applies a base layer of slurry and a main slurry sequentially onto the facing paper, which is then pressed into shape by a slurry-spreading roller.

[0003] Typically, gypsum board production systems are equipped with drive units, slurry spreading units, and cleaning units to ensure the proper application and spreading of the slurry. However, current cleaning units mainly target the main slurry. During the injection and spreading of the base slurry, hard lumps of slurry embedded in the base slurry flow towards the spreading roller. Due to the obstruction of the spreading roller, the slurry overflows to both ends of the spreading roller and then flows to the extruder. At this point, larger hard lumps can break the facing paper, causing the production line to stop. Utility Model Content

[0004] The purpose of this disclosure is to provide a lump removal device for gypsum board production, which can effectively reduce or eliminate lumps present in the slurry (e.g., the underlayer slurry), thereby ensuring the smooth implementation of gypsum board production and improving the performance and appearance quality of gypsum board products.

[0005] Therefore, according to one aspect of this disclosure, a lump removal device is provided for removing lumps from gypsum slurry applied to a facing paper. The lump removal device includes a pair of scraper assemblies adapted to be arranged downstream of a spreading roller, adjacent to both ends of the spreading roller. Each scraper assembly includes: a mounting frame adapted to be mounted to a conveying device of a gypsum board production system; and a scraper attached to the mounting frame, wherein the scraper is arranged parallel to the facing paper and configured to extend from above the facing paper at an angle relative to the conveying direction of the facing paper, such that the orthographic projection area of ​​the scraper on the facing paper covers the area through which the slurry flows past both ends of the spreading roller.

[0006] Based on the above technical concept, the embodiments of this disclosure may further include any one or more of the following optional forms.

[0007] In some alternative forms, the scraper is tilted at an angle of 15 to 25 degrees relative to the transport direction.

[0008] In some alternative forms, the scraper includes a connecting end attached to the mounting frame and a distal end remote from the mounting frame, wherein the distance between the connecting ends of a pair of scrapers arranged at both ends of the slurry roller is less than or equal to the length of the slurry roller.

[0009] In some alternative forms, the distance between the distal end of the scraper and the edge of the faceplate is 30 mm to 60 mm.

[0010] In some alternative forms, there is a gap between the scraper and the surface of the face paper, the gap being 3 mm to 7 mm.

[0011] In some alternative versions, the gap between the scraper and the surface of the face paper is 5 mm.

[0012] In some alternative configurations, the mounting bracket is configured to be movable relative to the surface of the face paper, and the scraper assembly further includes a lifter and a guide sleeve attached to the mounting bracket.

[0013] In some alternative forms, the doctor blade assembly is arranged at a first liner roller adjacent to the sizing roller, and the lump removal device further includes a second liner roller arranged downstream of the first liner roller, wherein the second liner roller is parallel to the first liner roller, and the orthographic projection area of ​​the doctor blade on the face paper is located between the first liner roller and the second liner roller.

[0014] In some alternative forms, the hard block removal device further includes a collection trough disposed below the scraper assembly.

[0015] According to another aspect of this disclosure, a gypsum board production system is provided, the gypsum board production system including the above-described blockage removal device.

[0016] The lump removal device disclosed herein effectively removes lumps that accumulate at both ends of the slurry after flowing through the slurry roller from the facing paper (production line), by providing a scraper assembly downstream of the slurry roller. This avoids adverse effects such as jamming or breaking the facing paper in subsequent production processes, ensuring the smooth implementation of gypsum board production. By removing larger lumps from the slurry, the performance and appearance quality of the gypsum board products are also improved. Attached Figure Description

[0017] Other features and advantages of this disclosure will be better understood through the following detailed description of alternative embodiments in conjunction with the accompanying drawings. For clarity, the dimensions and relative positions of the components are not drawn to scale.

[0018] Figure 1 This is a partially simplified schematic diagram of an existing gypsum board production system, showing the arrangement of the slurry spreading roller and the first liner roller adjacent to the slurry spreading roller;

[0019] Figure 2 This is a partially simplified schematic diagram of a gypsum board production system according to one embodiment of the present disclosure, showing the arrangement of a slurry spreading roller, a first liner roller adjacent to the slurry spreading roller, and a blockage removal device.

[0020] Figure 3 This is a schematic diagram of a scraper assembly according to one embodiment of the present disclosure;

[0021] Figure 4 This is a partial schematic diagram of a gypsum board production system according to one embodiment of the present disclosure;

[0022] Figure 5 yes Figure 4 A side view of the gypsum board production system, showing some of the supporting devices;

[0023] Figure 6 yes Figure 5 Top view of the gypsum board production system;

[0024] Figure 7 yes Figure 6 An enlarged schematic diagram of section A, with some supporting devices omitted in a simplified manner. Detailed Implementation

[0025] The implementation and use of the embodiments are discussed in detail below. However, it should be understood that the specific embodiments discussed are merely illustrative of particular ways of implementing and using this disclosure, and are not intended to limit the scope of this disclosure. The descriptions of the structural positions of various components, such as up, down, top, bottom, etc., are not absolute but relative. These directional descriptions are appropriate when the various components are arranged as shown in the figures, but they change accordingly when the positions of the various components in the figures change.

[0026] In this document, expressions such as “including” or similar expressions such as “having” are open-ended and do not exclude additional unlisted elements, steps or components.

[0027] In this document, the terms “first”, “second”, etc., are not used to specify the order of events or the number of components, unless otherwise stated.

[0028] In this document, unless otherwise explicitly specified, the terms "installation," "attachment," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this document according to the specific circumstances.

[0029] With increasing consumer demand for functional gypsum board, some gypsum board products include two types of slurry in their core, such as a main slurry and a base slurry, to provide additional functions such as formaldehyde removal while fulfilling the basic functions of gypsum board. Existing gypsum board production systems typically include cleaning devices, but these devices primarily clean the main slurry, including the spreading and conveying equipment, but do not address the hard lumps in the base slurry. The inventors discovered that when the base slurry flows through the spreading roller, larger hard lumps in the base slurry are obstructed and flow towards both ends of the spreading roller, further traveling with the slurry to the subsequent extruder. These larger hard lumps may jam and break the facing paper, causing production line shutdowns.

[0030] According to the concept of this disclosure, a device for removing lumps in the pulp is provided near the pulping roller, which can promptly remove larger lumps flowing through both ends of the pulping roller from the production line, avoiding the problem of the facing paper being jammed. Furthermore, while ensuring that lumps do not or cannot easily pass through the removal device, the pulp is still smoothly transported along the conveying device.

[0031] Figure 1 An exemplary simplified schematic diagram of a conventional gypsum board production system is shown, including a sizing roller 100 and a first liner roller 200 arranged adjacent to the sizing roller 100 for supporting the facing paper. In contrast, Figure 2 A partially simplified schematic diagram of a gypsum board production system according to one embodiment of the present disclosure is shown, wherein a blockage removal device 300 according to the present disclosure is disposed downstream of the slurry spreading roller 100.

[0032] Specifically, the lump removal device 300 is configured to remove lumps from the plaster slurry applied to the facing paper, and the lump removal device includes a pair of scraper assemblies. Figure 2 The first scraper assembly 310 and the second scraper assembly 320 are shown in the figure. The pair of scraper assemblies are adapted to be arranged downstream of the slurry roller 100, adjacent to both ends of the slurry roller 100, respectively. Figure 3An exemplary embodiment of a first scraper assembly 310 is shown. It should be understood that the first scraper assembly 310 and the second scraper assembly 320, respectively arranged adjacent to both ends of the spreading roller 100, are constructed identically and symmetrically. When describing a scraper assembly on one side, the corresponding structural design is also applied to the scraper assembly on the other side. Generally, the first scraper assembly 310 includes a mounting bracket 311 and a scraper 312, combined with... Figure 4 As shown, the mounting bracket 311 is adapted to be installed on the conveying device of the gypsum board production system, and the scraper 312 is attached to the mounting bracket 311.

[0033] Based on this disclosure, in conjunction with Figures 4 to 6 The doctor blade 312 is arranged parallel to the facing paper 400 and is positioned at an angle relative to the transport direction D of the facing paper 400, extending from above the facing paper 400. This ensures that the orthographic projection area of ​​the doctor blade 312 on the facing paper 400 covers the area through which the pulp flows past both ends of the spreading roller 100. In other words, when lumps in the pulp flow through this orthographic projection area, they will inevitably come into contact with the doctor blade, thus effectively removing the lumps. It should be understood that "removal" in this context means that when the lumps come into contact with the doctor blade, the lumps are subjected to the impact force of the injected pulp and the force exerted by the doctor blade perpendicular to its surface. The combined force causes the lumps to move along the transport direction D and, due to the inclined doctor blade, also move towards the edge of the facing paper until they fall off.

[0034] Combination Figure 6 and Figure 7 As shown, advantageously, the angle α of the scraper 312 tilted relative to the conveying direction D is 15 to 25 degrees, preferably 20 degrees. If the angle of the scraper tilt is too large, the orthographic projection area of ​​the scraper on the facing paper will be too small, and the probability of hard lumps passing through the scraper and continuing to flow on the facing paper is high; if the angle of the scraper tilt is too small, the scraper length will be too long while ensuring a suitable orthographic projection area on the facing paper, thereby reducing the rigidity of the scraper and increasing the possibility of hard lumps missing. Tests have shown that for most gypsum board production systems, scrapers with an angle of tilt within the above range can effectively remove hard lumps. For example, 18 degrees, 23 degrees, etc., and any value within the range of any two values ​​listed above as endpoints can also be selected. The scraper is preferably made of a smooth material, such as stainless steel, polyurethane (PU), polyethylene (PE), etc., without limitation, so that hard lumps in the slurry are less likely to accumulate on the scraper surface and are easier to move along the scraper and fall off.

[0035] To ensure the pulp can spread smoothly onto the facing paper after flowing through both ends of the spreading roller and the doctor blade assembly—that is, the pulp does not contact the doctor blade, while hard lumps in the pulp are blocked by the doctor blade—a gap d1 exists between the doctor blade 312 and the surface of the facing paper 400. Figure 5 As shown, the gap d1 allows the slurry to flow through while preventing larger hard lumps from passing through. Tests have shown that when the size of the hard lumps is greater than or equal to 8 mm, the facing paper is prone to breaking. Alternatively, the gap d1 can be selected from 3 mm to 7 mm, preferably 5 mm, thus ensuring the quality of the gypsum board while removing larger hard lumps. For different gypsum board production systems, it is advantageous to set the gap d1 between the scraper and the surface of the facing paper to be slightly adjustable. Therefore, in some embodiments, such as... Figure 3 and Figure 4 As shown, the mounting bracket 311 is configured to be able to move up and down relative to the surface of the face paper. Accordingly, the doctor blade assembly 310 also includes a lifter 313 and a guide sleeve 314 attached to the mounting bracket 311. It should be understood that the illustrated structures are merely examples, and based on the concept of this disclosure, those skilled in the art can employ any other suitable structural design to achieve the function of moving the mounting bracket up and down relative to the surface of the face paper.

[0036] Combination Figure 3 , Figure 4 and Figure 6 The doctor blade 312 includes a connecting end 315 attached to the mounting frame 311 and a distal end 316 away from the mounting frame 311. Advantageously, the distance between the connecting ends of a pair of doctor blades arranged at both ends of the spreading roller 100 is less than or equal to the length of the spreading roller. This helps to ensure that the orthographic projection area of ​​the doctor blade on the facing paper completely covers the area through which the pulp flows across both ends of the spreading roller, thereby reliably ensuring that lumps larger than a defined size are removed. For example, combined with Figure 7 As exemplified, the distance d2 between the edge 110 of the spreading roller 100 and the edge 410 of the facing paper 400, and the distance d3 between the connecting end 315 of the doctor blade 312 and the edge 410 of the facing paper 400, where d3 is greater than d2 (e.g., d2 is 60 mm and d3 is 85 mm), ensures that the orthographic projection area of ​​the doctor blade 312 on the facing paper 400 completely covers the area through which the pulp flows past both ends of the spreading roller 100. As mentioned above, the length of the doctor blade should not be too long. In some embodiments, the distance d4 between the distal end 316 of the doctor blade 312 and the edge 410 of the facing paper 400 can be 30 mm to 60 mm, for example... Figure 7 In the example, it can be 45mm. It should be understood that for different gypsum board production systems, the distance d4 can also be selected as 35mm, 40mm, 50mm, 55mm, etc., as well as any value within the interval of any two values ​​listed above as endpoints.

[0037] In further embodiments, the doctor blade assembly is arranged at a first liner roller 200 adjacent to the spreading roller 100. The lumps removal device 300 may also include a second liner roller 330 arranged downstream of the first liner roller 200, the second liner roller 330 being parallel to the first liner roller 200, and the orthographic projection area of ​​the doctor blade on the facing paper 400 being located between the first liner roller 200 and the second liner roller 330. Figure 6 and Figure 7 As shown. By providing a second liner roller 330, the first liner roller 200 and the second liner roller 330 together establish a plane for supporting the cover paper 400, ensuring that the surface of the cover paper between the two liner rollers is parallel to the doctor blade, so that the gap d1 is kept constant, so that the hard block will not or cannot easily pass between the doctor blade and the cover paper, further ensuring the hard block removal effect.

[0038] Using the hard block removal device disclosed herein, combined with Figure 6 As shown, when the pulp flows to the spreading roller 100 in the direction of the arrow, the hard lumps in the pulp are diverted to both ends of the spreading roller 100 by the obstruction of the spreading roller 100. Due to the presence of the doctor blade assembly, the pulp that has flowed past both ends of the spreading roller 100 will reach the doctor blade. At this time, for example, hard lumps larger than 5 mm will be pushed out of the pulp by the lateral force generated by the doctor blade while moving, and will eventually be pushed out of the edge of the facing paper 400 and fall off. Hard lumps smaller than 5 mm can pass through the gap between the doctor blade and the facing paper 400. Even if the pulp carries these hard lumps smaller than 5 mm, because the size of the hard lumps is small, they will not break the facing paper at the extruder and cause a machine stoppage. In this way, the hard lump removal device of this disclosure can effectively and reliably remove larger hard lumps from the pulp, avoid machine stoppages caused by hard lumps, and improve the operating efficiency of the production system.

[0039] In some embodiments, the lump removal device may further include a collection trough (not shown) disposed below the scraper assembly to facilitate the collection and disposal of fallen slurry lumps. It should be understood that the lump removal device described herein is for removing lumps from the underlying slurry; however, depending on the specific needs, the lump removal device disclosed herein is also applicable to removing lumps from the main slurry. Furthermore, the lump removal device has a simple structural design, is easy to implement, and is inexpensive, making it applicable to various gypsum board production systems.

[0040] It should be understood here that the embodiments shown in the figures only illustrate various alternative shapes, sizes and arrangements of the hard block removal device according to the present disclosure, and are merely illustrative and not limiting. Other shapes, sizes and arrangements may be adopted without departing from the spirit and scope of the present disclosure.

[0041] The technical content and features of this disclosure have been disclosed above. However, it is understood that those skilled in the art can make various changes and improvements to the above-disclosed concept under the inventive concept of this disclosure, but all such changes and improvements fall within the protection scope of this disclosure. The description of the above embodiments is illustrative rather than restrictive, and the protection scope of this disclosure is determined by the claims.

Claims

1. A hard lump removing device for removing hard lumps in a gypsum slurry applied on a facing paper, characterized in that, The hard lump removing device comprises a pair of doctor blade assemblies adapted to be arranged respectively adjacent to two ends of the pasting roller downstream of the pasting roller, each of the doctor blade assemblies comprising: a mounting frame adapted to be mounted to a conveying device of a gypsum board production system; and a doctor blade attached to the mounting frame, wherein the doctor blade is arranged parallel to the facing paper and is configured to extend over the facing paper from above the facing paper at an angle relative to a conveying direction of the facing paper such that a footprint of the doctor blade on the facing paper covers an area through which a slurry flows past the two ends of the pasting roller.

2. The hard patch removal device of claim 1, wherein, The doctor blade is inclined at an angle of 15 to 25 degrees relative to the conveying direction.

3. The hard patch removal device of claim 1, wherein, The doctor blade comprises a connection end attached to the mounting frame and a distal end distanced from the mounting frame, wherein a distance between the connection ends of a pair of the doctor blades arranged at the two ends of the pasting roller is less than or equal to a length of the pasting roller.

4. The hard mass clearing device of claim 3, wherein, A distance between the distal end of the doctor blade and an edge of the facing paper is 30 to 60 mm.

5. The hard patch removal device of claim 1, wherein, A gap between the doctor blade and a surface of the facing paper is 3 to 7 mm.

6. The hard patch removal device of claim 5, wherein, The gap between the doctor blade and the surface of the facing paper is 5 mm.

7. The hard build-up removal device according to any one of claims 1 to 6, characterized in that The mounting frame is configured to be raised and lowered relative to the surface of the facing paper, and the doctor blade assembly further comprises a lifter and a guide sleeve attached to the mounting frame.

8. The hard build-up removal device according to any one of claims 1 to 6, characterized in that The doctor blade assembly is arranged at a first backing roller adjacent to the pasting roller, and the hard lump removing device further comprises a second backing roller arranged downstream of the first backing roller, wherein the second backing roller is parallel to the first backing roller, and a footprint of the doctor blade on the facing paper is located between the first backing roller and the second backing roller.

9. The hard build-up removal device according to any one of claims 1 to 6, characterized in that The hard lump removing device further comprises a collecting groove arranged below the doctor blade assembly.

10. A gypsum board production system characterized by, The gypsum board production system comprises the hard lump removing device according to any one of claims 1 to 9.

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