Laminating equipment and laminating method for composite fiberboard

Abstract

The invention discloses composite fiberboard laminating equipment and a laminating method, and relates to the technical field of fiberboard processing, aiming at the pressing principle of a fiberboard, after raw materials are put into a limiting frame, the raw materials are fully bonded and fixed to form a board by using the pressure and temperature conditions applied by two groups of hot pressing boards, and the board is pressed by using the hot pressing boards. On the basis, a needle threading optimization scheme is provided, a plurality of cavities are formed through the needle threading on the basis of pressing raw materials, the pressing space can be enlarged essentially, the purpose is to change the temperature change of the position of a core layer in the hot pressing process, and heat transfer is achieved through the hollow design of the needle threading. However, the key content is that the hot-pressing state of the raw material is fed back through displacement data obtained in real time, the threading needle is driven to perform co-movement abdication so as to restore the hot-pressing space of the raw material, finally, the curing time of the raw material is fed back through displacement parameters in the displacement sensor, and the abnormal problems of bulging, layering and the like existing after a plate is formed are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of fiberboard processing, and in particular to a composite fiberboard laminating device and a laminating method. Background Art

[0002] Fiberboard is mostly based on wood processing residues, crop straw, etc., and is formed under the combined action of strong pressure + high temperature + adhesion. Please refer to the relevant issues involved in the publication number CN114393665A for details. The core content of its production process lies in material properties (glue), temperature and pressure.

[0003] On the basis that the moisture content and colloid properties of the materials are in the best state, the temperature and pressure parameters can most directly affect the quality of the finished product. If the board is thicker, the steam pressure of the core layer of the board will be relatively large during the continuous hot pressing process, which can easily cause delamination and bulging. However, the key point to note is the hot pressing time. Conventional production processes are mostly based on "empirical parameters", such as: "1mm board thickness ≈ 1 minute" to calculate the hot pressing time. However, in actual situations, due to many considerations such as the uniformity of substrate laying and substrate properties, using "empirical parameters" as production parameters alone is not the best option. If the time is insufficient, it will lead to sticking to the template or incomplete curing. If the time is too long, the toughness of the board will be reduced. The present invention proposes a solution to this problem. Summary of the Invention

[0004] The purpose of the present invention is to provide a composite fiberboard lamination device and lamination method, which takes into account the two parameters of temperature and pressure during the hot pressing process of the fiberboard. When the thickness of the board is thick, it is easy to cause delamination and bulging, but the key lies in the control of the hot pressing time. If there is a difference in the hot pressing time, it will directly affect the quality of the finished product.

[0005] The object of the present invention can be achieved by the following technical solution: A composite fiberboard laminating device includes an upper pressing plate, a bottom plate frame and a hydraulic drive structure, wherein the upper pressing plate is moved in a vertical direction by the hydraulic drive structure, and a hot pressing plate and a pin plate are respectively provided at a side where the upper pressing plate and the bottom plate frame are close to each other, and a limit frame corresponding to the hot pressing plate is installed on the bottom plate frame;

[0006] The pin plate is provided with a threading needle at one side position corresponding to the hot pressing plate, a side bending arc frame is rotatably installed at the middle position of the side of the upper pressing plate, a displacement sensor corresponding to the side bending arc frame is installed on the bottom plate frame, and the hot pressing plate is fixedly installed in the upper pressing plate and the bottom plate frame.

[0007] It is further configured as follows: multiple groups of electric heating tubes are installed in the hot pressing plate, and corresponding perforations for needle threading are opened in the hot pressing plate, and the perforations and the electric heating tubes are staggered.

[0008] It is further configured as follows: electric push rods corresponding to the pin plates are installed on the upper pressing plate and the bottom plate frame, and the pin plates are moved in a direction close to the hot pressing plate by the electric push rods.

[0009] It is further configured that: the needles in the upper pressing plate and the pin plate in the bottom plate frame are staggered along the length direction and the width direction of the hot pressing plate.

[0010] It is further configured as follows: the side bending arc frames are symmetrically arranged along the middle position of the upper pressure plate, the displacement sensors are arranged at the middle position of the two side bending arc frames, and the displacement sensor transmission rod is provided with a horizontally arranged transverse guide rod along the direction of the corresponding side bending arc frame.

[0011] It is further configured as follows: the side bending arc frame is in an outwardly curved arc shape in a direction away from the displacement sensor, and a roller is provided at the lower end of the side bending arc frame.

[0012] It is further configured as follows: a cooperation groove corresponding to the transverse guide rod is opened in the side bending arc frame, and limiting balls are provided at positions at both ends of the cooperation groove corresponding to the transverse guide rod.

[0013] The present invention also provides a lamination method for a composite fiberboard lamination device, wherein equal amounts of raw materials are put into a limiting frame and the following actions are performed:

[0014] Action 1: The hydraulic drive structure drives the hot pressing plate in the upper pressing plate to move downward, and cooperates with the limit frame to pre-press the raw materials, and the pre-pressing thickness is set to h, and the electric heating tube in the hot pressing plate is not in the heat release process;

[0015] Action 2: Based on action 1, the electric push rod drives the pin plate to move in the direction close to the hot pressing plate, and the needle penetrates the hot pressing plate and limits the distance between the needle end and the hot pressing plate surface to be greater than 0.5*n. The electric heating tube in the hot pressing plate is in the heat release process;

[0016] Action three: During the operation of action two, the upper pressure plate continues to move downward through the hydraulic drive structure, and the displacement data of the upper pressure plate is obtained in real time through the displacement sensor. The action state of the pin plate is adjusted according to the displacement data to drive the needle to reset until the end of the needle is completely flush with the surface of the hot press plate.

[0017] The present invention has the following beneficial effects:

[0018] 1. Based on the hot pressing process of the limiting plate, the raw materials are placed into the limiting frame and the hot pressing process of the two hot pressing plates is used to compact and gradually solidify the raw materials. Specifically, the pressure and temperature conditions applied by the hot pressing plates are used as the basis for proposing an optimization scheme for needle threading. Needle threading does not essentially interfere with the overall hot pressing process. It only forms several cavities at the pre-pressed plate position based on the pressing of the raw materials. The hollow design of the needle threading achieves a small range of heat conduction. Its purpose is to avoid significant temperature changes in the core layer of the plate, and to avoid abnormal problems such as delamination and bulging of the plate after subsequent solidification.

[0019] 2. Based on the above content, the key content is reflected in the coordinated retreat process of the needle. In the process of the upper pressure plate approaching the bottom plate frame, the downward movement amplitude of the upper pressure plate is obtained in real time through the displacement sensor. The key is to feedback the hot pressing state of the raw material through the displacement data obtained in real time, which is specifically used to restore the hot pressing space of the raw material and hot press the raw material into a plate of corresponding thickness. However, the key content is to use the displacement parameters in the displacement sensor to feedback the curing time of the raw material, which is key to avoid abnormal problems such as bulging and delamination after the plate is formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of a composite fiberboard laminating device proposed by the present invention;

[0022] Figure 2 For the present invention Figure 1 Front view of

[0023] Figure 3 Schematic diagram of the structure of the hot pressing plate in the present invention;

[0024] Figure 4 is a cross-sectional view of the hot pressing plate of the present invention;

[0025] Figure 5 It is a side cross-sectional view of the side bending arc frame of the present invention;

[0026] Figure 6 This is a diagram of the lamination positions in a lamination method in a composite fiberboard lamination device of the present invention.

[0027] In the figure: 1. Upper pressure plate; 2. Bottom plate frame; 3. Hydraulic drive structure; 4. Displacement sensor; 5. Side bending arc frame; 6. Electric push rod; 7. Limit frame; 8. Hot pressing plate; 9. Needle threading; 10. Pin board; 11. Electric heating tube; 12. Perforation; 13. Horizontal guide rod; 14. Limit ball; 15. Coordination groove. DETAILED DESCRIPTION

[0028] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Example 1: Considering the temperature and pressure parameters during the hot pressing process of fiberboard, thicker boards are prone to delamination and bulging, but the key lies in the control of hot pressing time. If there is a difference in hot pressing time, it will directly affect the quality of the finished product. The following technical solutions are proposed:

[0030] Reference Figures 1 to 6 In this embodiment, a composite fiberboard laminating device includes an upper pressing plate 1, a bottom plate frame 2, and a hydraulic drive structure 3. The upper pressing plate 1 is moved in the vertical direction by the hydraulic drive structure 3. A hot pressing plate 8 and a pin board 10 are respectively provided on the side where the upper pressing plate 1 and the bottom plate frame 2 are close to each other. A limit frame 7 corresponding to the hot pressing plate 8 is installed on the bottom plate frame 2.

[0031] A threading needle 9 is installed on one side of the pin plate 10 corresponding to the hot press plate 8. A side bending arc frame 5 is rotatably installed on the middle position of the side of the upper press plate 1. A displacement sensor 4 corresponding to the side bending arc frame 5 is installed on the bottom plate frame 2. The hot press plate 8 is fixedly installed in the upper press plate 1 and the bottom plate frame 2. Multiple groups of electric heating tubes 11 are installed in the hot press plate 8, and a perforation 12 corresponding to the threading needle 9 is opened in the hot press plate 8. The perforation 12 and the electric heating tube 11 are staggered. An electric push rod 6 corresponding to the pin plate 10 is installed on the upper press plate 1 and the bottom plate frame 2. The pin plate 10 moves in the direction close to the hot press plate 8 through the electric push rod 6, and an equal amount of raw materials are put into the limit frame 7, and the following actions are performed:

[0032] Action 1: The hydraulic drive structure 3 drives the hot pressing plate 8 in the upper pressing plate 1 to move downward, and cooperates with the limit frame 7 to pre-compact the raw material, and the pre-compacting thickness is set to h, and the electric heating tube 11 in the hot pressing plate 8 is not in the heat release process;

[0033] Action 2: Based on Action 1, the electric push rod 6 drives the pin plate 10 to move in the direction close to the hot pressing plate 8, and the needle 9 penetrates the hot pressing plate 8 and limits the distance between the end of the needle 9 and the surface of the hot pressing plate 8 to be greater than 0.5*n. The electric heating tube 11 in the hot pressing plate 8 is in the heat release process;

[0034] Action three: During the operation of action two, the upper pressure plate 1 continues to move downward through the hydraulic drive structure 3, and the displacement data of the upper pressure plate 1 is obtained in real time through the displacement sensor 4. The action state of the pin plate 10 is adjusted according to the displacement data to drive the needle 9 to reset until the end of the needle 9 is completely flush with the surface of the hot pressing plate 8.

[0035] Basic principle: The essence of the hot pressing process of the fiberboard is to use temperature and pressure conditions to complete the hot pressing and curing process of the raw materials. Based on the relevant structure in the present invention, a fixed amount of raw materials that are evenly mixed are directly put into the limit frame 7, and then the hot pressing plate 8 is used to press the raw materials in the limit frame 7. This part is the basic principle of the hot pressing process of the fiberboard. In the present invention, a pin plate 10 is added to one side of the hot pressing plate 8. The pin plate 10 does not essentially participate in the hot pressing process of the fiberboard, but a number of needles 9 are set on the pin plate 10. While the hot pressing plate 8 is pressurizing the raw materials, the following optimization is specifically achieved:

[0036] S1: The difference from the conventional hot pressing method is that when the hot pressing plate 8 applies pressure to the raw material, no temperature conditions are provided. The pre-pressing process of the raw material is completed solely by the pressure applied by the hot pressing plate 8. Figure 6 For example, a pre-compression space is formed by using the limit frame 7 and the hot pressing plate 8 in the upper pressing plate 1. In this state, the fiberboard is not completely compressed and formed, so the electric push rod 6 is further used to drive the pin plate 10 to move downward, with the purpose of ensuring that one end of the needle 9 is completely penetrated into the pre-compression space. In this process, it should be noted that if the thickness of the pre-compression space formed is n, then the length of the needle 9 located in the pre-compression space is greater than 0.5*n. In this process, the pre-compression space will be further compressed, and it should also be noted that the needles 9 in the two pin plates 10 are staggered to avoid interference between the needles 9.

[0037] S2: Taking the above content as an example, after the pre-pressing is completed, the hot pressing plate 8 provides heat energy under the action of the electric heating tube 11, and in this state, because the temperature conditions and pressure conditions act at the same time, the upper pressing plate 1 can be driven to continue to move downward, so that the pre-pressing space formed above is further reduced, ensuring that the raw materials are fully connected and pressed. In this process, it is important to note that: when the upper pressing plate 1 continues to move downward, on the one hand, it is necessary to cooperate with the displacement sensor 4 to detect the downward speed and downward amplitude of the upper pressing plate 1 in real time, and on the other hand, cooperate with the displacement parameters obtained by the displacement sensor 4 to control the reset action of the needle 9. This part is the key content in the present invention. The focus is that when the needle 9 is fully reset, it is necessary to ensure that the end plane of the needle 9 is completely flush with the surface of the hot pressing plate 8.

[0038] Example 2: Supplementary explanation of the needle threading structure and displacement detection method in Example 1:

[0039] The needles 9 in the pin plates 10 in the upper pressure plate 1 and the bottom plate frame 2 are staggered along the length and width directions of the hot pressing plate 10. The inside of the needle 9 is hollow, and the lower end of the needle 9 is closed. The side bending arc frame 5 is symmetrically arranged along the middle position of the upper pressure plate 1. The displacement sensor 4 is arranged in the middle position of the two side bending arc frames 5, and the transmission rod of the displacement sensor 4 is provided with a horizontally arranged transverse guide rod 13 along the direction corresponding to the side bending arc frame 5. The side bending arc frame 5 is in an outward bending arc shape in the direction away from the displacement sensor 4, and a roller is provided at the lower end of the side bending arc frame 5. A cooperating groove 15 corresponding to the transverse guide rod 13 is opened in the side bending arc frame 5, and a limiting ball 14 is provided at the two ends of the cooperating groove 15 corresponding to the transverse guide rod 13.

[0040] Solution description: The following supplementary description is provided in conjunction with the technical content in Example 1:

[0041] S3: First, optimize and improve the structure of the threading needle 9. As shown in the first embodiment, the lower end of the threading needle 9 is closed and horizontal. The key point is that the inside of the threading needle 9 is hollow, and the upper end of the threading needle 9 is open. After the pre-compression is completed, the threading needle 9 penetrates into the pre-compression space. When the hot pressing plate 8 applies the temperature condition, if the thickness of the sheet to be formed is large, then the temperature of the core layer of the sheet is relatively high. For this, the hollow design of the threading needle 9 can be used to form a heat transfer process. The material of the threading needle 9 is a high heat conductive material. In essence, it will not directly change the temperature condition of the fiberboard during hot pressing. It only reduces the temperature concentration at the core layer of the sheet to avoid bulging, delamination and other undesirable problems after subsequent forming.

[0042] S4: Reference Figure 5To illustrate, after completing the pre-pressing action, the upper pressure plate 1 moves toward the bottom plate frame 2. During this stage, the side bending arc frame 5 rotates in the direction of reverse deviation. Then, when the side bending arc frame 5 undergoes directional rotation, the transverse guide rod 13 therein forms a passive movement process through the limit ball 14 and the cooperative groove 15, so that the downward movement distance of the upper pressure plate 1 can be obtained in real time through the displacement sensor 4. The explanation of the setting position of the displacement sensor 4 in the present invention is: because the thickness change of the fiberboard hot pressing is relatively small, if a precision displacement sensor is used to obtain the downward movement distance of the upper pressure plate 1, on the one hand, it will increase the investment cost, and on the other hand, if the downward movement distance fluctuates greatly, it will cause irreversible damage to the precision displacement sensor 4. For this reason, the present invention uses the side bending arc frame 5 and the transverse guide rod 13 to cooperate with the downward movement direction of the upper pressure plate 1 to form a trigonometric function calculation method, which can "expand" the displacement change of the upper pressure plate 1;

[0043] However, it should be noted that: after the pre-pressing action is completed, the roller at the lower end of the side bending arc frame 5 contacts the upper surface position of the bottom plate frame 2, and the displacement sensor 4 is reset to zero, the purpose of which is to obtain the displacement parameters of the upper pressing plate 1 continuing to move downward and the needle 9 returning to its original position in real time;

[0044] S5: The data change of the displacement sensor 4 when the upper pressing plate 1 continues to move downward is timed. As shown in Example 1, the relative depth of the needle 9 in the pre-pressing space is greater than 0.5*n. When the hot pressing plate 8 continues to press the raw materials, the relative depth of the needle 9 in the pre-pressing space gradually decreases. In essence, the pre-pressing space will be further squeezed. In this process, the downward movement speed of the upper pressing plate 1 is obtained through the displacement sensor 4. Specifically, the thickness A of the plate after hot pressing can be obtained according to the amount of raw materials input, and according to the thickness n of the pre-pressing space, the downward movement distance of the upper pressing plate 1 should be nA. Theoretically, the data obtained by the displacement sensor 4 is nA. Taking into account the pressing process of the raw materials, the downward movement speed of the upper pressing plate 1 is gradually reduced, but the displacement that needs to be considered in this process is the wear. When the needle 9 is reset, the upper pressure plate is changed. When the needle 9 is reset, the pre-pressing space becomes larger, so the downward movement speed of the upper pressure plate 1 tends to increase. Therefore, the key in the present invention is: the downward movement speed of the upper pressure plate 1 is calculated according to the displacement parameter obtained in the displacement sensor 4, and then the reset speed and reset distance of the needle 9 are generated according to the downward movement distance and downward movement speed obtained by the displacement sensor 4, and the downward movement speed of the upper pressure plate 1 is not a constant value. For this, a rough calculation is made based on the total length of the needle 9 in the pre-pressing space. If the total length of the needle 9 in the pre-pressing space is L, then the reset speed of the needle 9 is calculated based on the real-time obtained downward movement speed of the upper pressure plate 1 and the total length L, until the displayed value in the displacement sensor 4 reaches nA, indicating that the hot pressing is completed, and the hot pressing plate only maintains the position but no longer provides a temperature environment.

[0045] In summary, based on the pressing principle of fiberboard, after the raw materials are placed into the confinement frame, the pressure and temperature conditions applied by two sets of hot pressing plates are used to fully bond and fix the raw materials into a board. Based on this, an optimization scheme for needle threading is proposed. On the basis of pressing the raw materials, several cavities are formed by needle threading, which essentially expands the pressing space.

[0046] The purpose is to change the temperature change of the core layer position during the hot pressing process, and realize heat transfer by using the hollow design of the needle. However, the key content lies in: the hot pressing state of the raw material is fed back through the displacement data obtained in real time, and the needle is driven to retreat cooperatively, with the purpose of restoring the hot pressing space of the raw material, and finally the displacement parameters in the displacement sensor are used to feed back the curing time of the raw material, which is key to avoid abnormal problems such as bulging and delamination after the sheet is formed.

[0047] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A composite fiberboard laminating device, comprising an upper pressing plate (1), a bottom plate frame (2) and a hydraulic drive structure (3), characterized in that: The upper pressing plate (1) is moved in a vertical direction by a hydraulic drive structure (3), and a hot pressing plate (8) and a pin plate (10) are respectively provided at a position close to one side of the upper pressing plate (1) and the bottom plate frame (2), and a limit frame (7) corresponding to the hot pressing plate (8) is installed on the bottom plate frame (2); The pin plate (10) is provided with a threading needle (9) at a position corresponding to one side of the hot pressing plate (8); a side bending frame (5) is rotatably provided at a middle position on the side of the upper pressing plate (1); a displacement sensor (4) corresponding to the side bending frame (5) is provided on the bottom plate frame (2); and the hot pressing plate (8) is fixedly provided on the upper pressing plate (1) and the bottom plate frame (2).

2. The composite fiberboard laminating device according to claim 1, characterized in that: A plurality of groups of electric heating tubes (11) are installed in the hot pressing plate (8), and a perforation (12) corresponding to the piercing needle (9) is provided in the hot pressing plate (8), and the perforation (12) and the electric heating tube (11) are staggered.

3. The composite fiberboard laminating device according to claim 2, characterized in that: An electric push rod (6) corresponding to the pin plate (10) is installed on the upper pressing plate (1) and the bottom plate frame (2), and the pin plate (10) moves in a direction close to the hot pressing plate (8) through the electric push rod (6).

4. The composite fiberboard laminating device according to claim 3, characterized in that: The threading needles (9) in the pin insertion plate (10) in the upper pressing plate (1) and the bottom plate frame (2) are staggered along the length direction and the width direction of the hot pressing plate (10), the interior of the threading needles (9) is hollow, and the lower end of the threading needles (9) is closed.

5. The composite fiberboard laminating device according to claim 4, characterized in that: The side bending arc frames (5) are symmetrically arranged along the middle section of the upper pressure plate (1), the displacement sensors (4) are arranged at the middle sections of the two side bending arc frames (5), and the transmission rods of the displacement sensors (4) are provided with horizontally arranged transverse guide rods (13) along the direction corresponding to the side bending arc frames (5).

6. The composite fiberboard laminating device according to claim 5, characterized in that: The side bending arc frame (5) is in an outwardly curved arc shape in a direction away from the displacement sensor (4), and a roller is provided at the lower end of the side bending arc frame (5).

7. The composite fiberboard laminating device according to claim 6, characterized in that: The side bending arc frame (5) is provided with a cooperation groove (15) corresponding to the transverse guide rod (13), and the transverse guide rod (13) is provided with limiting balls (14) at both ends of the cooperation groove (15) corresponding to the position.

8. A laminating method for a composite fiberboard laminating device, applied to the composite fiberboard laminating device according to claim 6, characterized in that: Put equal amounts of raw materials into the limit frame (7) and perform the following actions: Action 1: The hot pressing plate (8) in the upper pressing plate (1) is driven downward by the hydraulic drive structure (3), and the raw material is pre-pressed in conjunction with the limit frame (7), and the pre-pressing thickness is set to h, and the electric heating tube (11) in the hot pressing plate (8) is not in the heat release process; Action 2: Based on Action 1, the electric push rod (6) drives the pin plate (10) to move in a direction close to the hot pressing plate (8), the needle (9) penetrates the hot pressing plate (8) and limits the distance between the end of the needle (9) and the surface of the hot pressing plate (8) to be greater than 0.5*n, and the electric heating tube (11) in the hot pressing plate (8) is in the heat release process; Action 3: During the operation of action 2, the upper pressing plate (1) continues to move downward through the hydraulic drive structure (3), and the displacement data of the upper pressing plate (1) is obtained in real time through the displacement sensor (4). The action state of the pin plate (10) is adjusted according to the displacement data to drive the pin (9) to reset until the end of the pin (9) is completely flush with the surface of the hot pressing plate (8).

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