A pre-pressing device for high-fiber fire-retardant board production

Abstract

The utility model relates to fiberboard production equipment technical field, concretely relates to a kind of pre-pressing device for high-fiber fire-retardant board production, it include: workbench, the workbench top is fixedly connected with frame;Pre-pressing mechanism, including the cylinder being installed on frame, the cylinder telescopic end is fixedly connected with upper pressing plate, upper pressing plate inside is equipped with upper runner, the utility model is pre-pressing mechanism is set, when the raw material of high-fiber fire-retardant board is pre-pressed, heat medium respectively enters into lower runner and upper runner, upper pressing plate and lower pressing plate are heated, to reduce the elastic modulus of high-fiber, make it more easily deformed, in addition, heated upper pressing plate and lower pressing plate can soften resin in advance, so it can produce certain initial adhesion in pre-pressing stage, help " stick " fiber, resist springback, to ensure that the thickness of high-fiber fire-retardant board blank after pre-pressing is stable, the production of subsequent process is convenient, and the production quality of high-fiber fire-retardant board is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of fiberboard production equipment, specifically to a pre-compression device for the production of high-fiber flame-retardant boards. Background Technology

[0002] High-fiber flame-retardant boards (such as mineral wool boards, calcium silicate boards, or wood fiberboard with added flame retardants) are widely used in areas with extremely high fire safety requirements, such as building interiors, ship cabins, and fireproof door cores, due to their excellent fire resistance, heat insulation, and sound absorption properties. In their production process, loose fiber raw materials mixed with flame retardants, binders, and other additives are typically laid into a board blank, which is then hot-pressed and cured.

[0003] Pre-pressing the loose slab before it enters the main hot press is a crucial step. The purpose of pre-pressing is threefold: first, to remove most of the air from inside the slab, achieving initial compaction and ensuring production safety; second, to impart a certain initial strength and density to the slab, enabling it to be transported smoothly and reliably to the hot press, preventing it from breaking or crumbling during transport; and third, to reduce the thickness of the slab, minimizing the number of stops required in the hot press, thereby improving hot pressing efficiency and reducing energy consumption.

[0004] Because high-fiber materials typically have a high modulus of elasticity, when traditional pre-compression devices pre-compress high-fiber flame-retardant boards, the bending of the fibers and the deformation of the network store a large amount of elastic potential energy. When the pressure is released, the stored elastic potential energy will push the fibers to spring back, resulting in the thickness of the pre-compressed flame-retardant board blank being greater than the set thickness after pre-compression, which affects the processing quality of subsequent processes. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a pre-compression device for the production of high fiber flame retardant boards, which can effectively solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides a pre-compression device for the production of high-fiber flame-retardant boards, comprising: The workbench has a frame fixedly connected to its top; The pre-compression mechanism includes a cylinder mounted on a frame. An upper pressure plate is fixedly connected to the telescopic end of the cylinder. An upper flow channel is opened inside the upper pressure plate, and both ends of the upper flow channel extend outside the upper pressure plate. A lower pressure plate is fixedly connected to the top of the worktable. A lower flow channel is opened inside the lower pressure plate, and both ends of the lower flow channel extend outside the lower pressure plate. The cooling mechanism includes a U-shaped tube disposed inside the lower pressure plate, a cooling water inlet pipe communicating with the inside of the U-shaped tube on one side, a hollow box disposed above the workbench, and air outlet holes evenly distributed in a straight line on the outside of the hollow box.

[0007] Preferably, the upper flow channel is distributed in a curved shape inside the upper pressure plate, and both ends of the upper flow channel are provided with a first pipeline interface.

[0008] Preferably, the lower flow channel is distributed in a curved shape inside the lower pressure plate, and a second pipeline interface is provided at both ends of the lower flow channel.

[0009] Preferably, the lower pressure plate has a limiting groove at its top, the upper pressure plate is convex in shape, and the protrusion of the upper pressure plate is adapted to the inner wall of the limiting groove.

[0010] Preferably, the top of the lower pressure plate is provided with a spiral groove, the spiral tube is installed inside the spiral groove, and the top of the spiral tube is horizontal with the top of the lower pressure plate.

[0011] Preferably, the side of the U-shaped tube away from the cooling water inlet pipe is fixedly connected to an outlet pipe that communicates with the inside of the U-shaped tube.

[0012] Preferably, the bottom of the hollow box is fixedly connected to two symmetrically distributed fixing rods, the end of the fixing rod away from the hollow box is fixedly connected to the workbench, and an air supply pipe communicating with the inside of the hollow box is provided on the outside of the hollow box.

[0013] The technical solution provided by this utility model has the following advantages compared with the known prior art: 1. This utility model, by setting a pre-compression mechanism, allows the heating medium to enter the lower and upper channels respectively during the pre-compression of the raw material of the high-fiber flame-retardant board, heating the upper and lower pressure plates, thereby reducing the elastic modulus of the high fiber and making it easier to deform. In addition, the heated upper and lower pressure plates can soften the resin in advance, so that it can generate a certain initial tack during the pre-compression stage, helping to "stick" the fiber and resist rebound, thereby ensuring the stability of the thickness of the high-fiber flame-retardant board blank after pre-compression, facilitating the production of subsequent processes, and improving the production quality of the high-fiber flame-retardant board.

[0014] 2. By setting up a cooling mechanism, after the pre-pressing mechanism has pre-pressed the slab, the injection of cooling water, in conjunction with the air cooling system, cools the pre-pressed slab, solidifies the results of the heating and pre-pressing, prevents or minimizes secondary rebound, stabilizes the slab structure, prepares for subsequent hot pressing, and further improves the production quality of flame-retardant boards. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the pre-compression device for producing high-fiber flame-retardant boards according to this utility model. Figure 2 This is a schematic cross-sectional view of the upper pressure plate of this utility model. Figure 3 This is a partial exploded structural diagram of the lower pressure plate of this utility model; Figure 4 This is a schematic cross-sectional view of the lower pressure plate of this utility model. Figure 5 This is a schematic diagram of a partial cross-sectional structure of the U-shaped tube of this utility model; Figure 6 This is a schematic diagram of the hollow box structure of this utility model.

[0017] The labels in the diagram represent: 1. Workbench; 2. Pre-compression mechanism; 21. Cylinder; 22. Upper pressure plate; 23. Upper flow channel; 24. Lower pressure plate; 25. Limiting groove; 26. Lower flow channel; 3. Cooling mechanism; 31. Water outlet pipe; 32. U-shaped pipe; 33. Cooling water inlet pipe; 34. U-shaped groove; 35. Air supply pipe; 36. Fixing rod; 37. Hollow box; 38. Air outlet; 4. Frame. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0019] The present invention will be further described below with reference to the embodiments. Example 1:

[0020] Reference Figure 1-4 This is the first embodiment of the present invention, which discloses a pre-compression device for the production of high-fiber flame-retardant boards, comprising: Workbench 1, with a frame 4 fixedly connected to the top of the workbench 1. The frame 4 is used to facilitate the installation of cylinder 21. The pre-compression mechanism 2 includes a cylinder 21 mounted on the frame 4. The cylinder 21 is fixedly connected to an upper pressure plate 22 at its telescopic end. An upper flow channel 23 is opened inside the upper pressure plate 22, and both ends of the upper flow channel 23 extend outside the upper pressure plate 22. A lower pressure plate 24 is fixedly connected to the top of the worktable 1. A lower flow channel 26 is opened inside the lower pressure plate 24, and both ends of the lower flow channel 26 extend outside the lower pressure plate 24.

[0021] Specifically, the upper flow channel 23 is distributed in a curved shape inside the upper pressure plate 22 to maximize the heat exchange area and ensure that the upper pressure plate 22 is heated evenly. Both ends of the upper flow channel 23 are provided with a first pipeline interface for connecting to an external heat medium supply and recovery system.

[0022] Specifically, the lower flow channel 26 is distributed in a curved shape inside the lower pressure plate 24 to match the heating effect of the upper pressure plate 22, and both ends of the lower flow channel 26 are provided with a second pipeline interface for connecting the heat medium circulation pipeline.

[0023] Specifically, the lower pressure plate 24 has a limiting groove 25 on its top for accurately accommodating and positioning the high-fiber flame-retardant board material. The upper pressure plate 22 is convex in shape, and the protrusion of the upper pressure plate 22 is adapted to the inner wall of the limiting groove 25 to ensure accurate guidance and effective sealing of the material area when the mold is closed, preventing the material from overflowing laterally under pressure. At the same time, it helps to regularize and shape the edge of the blank during the pre-pressing process.

[0024] In this embodiment, the heat conducted to the high-fiber raw material in the limiting groove 25 can significantly reduce the glass transition temperature of cellulose, thereby effectively reducing the elastic modulus of the high-fiber material, enhancing its plasticity, and making it easier to produce irreversible compressive deformation under pressure.

[0025] Heat simultaneously acts on the thermosetting resins in the mixed raw materials, such as phenolic resin or melamine-modified urea-formaldehyde resin, causing them to soften and initially melt in advance. This pre-softening allows the resin to generate sufficient initial tack under relatively low pressure, initially wetting and bonding the fibers to form a pre-integrated blank. This initial tack effectively resists the immediate rebound tendency of the fibers due to elastic recovery after pressure is removed, thus ensuring that the thickness of the pre-pressed blank remains highly stable after demolding. This thickness stability is crucial for subsequent hot pressing processes, ensuring a uniform density distribution of the blank entering the hot press and avoiding problems such as uneven thickness and density gradients caused by springback. This lays a solid foundation for the final production of high-quality, high-flatness, and uniformly structured high-fiber flame-retardant boards. Example 2:

[0026] Reference Figure 1 and Figure 3-6 This is the second embodiment of the present invention, which differs from the first embodiment in that: The cooling mechanism 3 includes a U-shaped tube 32 disposed inside the lower pressure plate 24. A cooling water inlet pipe 33 communicating with the inside of the U-shaped tube 32 is disposed on one side for introducing cooling medium. A hollow box 37 is disposed above the workbench 1. Air outlet holes 38 are distributed in a straight line at equal intervals on the outside of the hollow box 37 for uniformly spraying cooling air.

[0027] Specifically, the top of the lower pressure plate 24 is provided with a spiral groove 34. The spiral groove 34 facilitates the installation of the spiral tube 32. The spiral tube 32 is installed inside the spiral groove 34, and the top of the spiral tube 32 is horizontal with the top of the lower pressure plate 24, ensuring that the bottom surface of the slab is in direct or indirect contact with the cooling element, while not affecting the flatness of the working surface of the lower pressure plate 24.

[0028] Specifically, a water outlet pipe 31, which communicates with the inside of the loop pipe 32, is fixedly connected to the side of the loop pipe 32 away from the cooling water inlet pipe 33. This outlet pipe is used to discharge the heated cooling water and form a circulating cooling system.

[0029] Specifically, the bottom of the hollow box 37 is fixedly connected to two symmetrically distributed fixing rods 36. The end of the fixing rod 36 away from the hollow box 37 is fixedly connected to the workbench 1 to ensure that the hollow box 37 is stably suspended above the slab. An air supply pipe 35 communicating with the inside of the hollow box 37 is provided on the outside of the hollow box 37 for connecting to an external cold air supply device.

[0030] The remaining structure is the same as that in Example 1.

[0031] In this embodiment, the combined cooling mode of "water-cooled base plate + air-cooled upper surface" constitutes a highly efficient and uniform three-dimensional cooling system.

[0032] It can quickly and uniformly cool pre-compressed slabs from a high-temperature state, such as the viscous flow state of resin, to below their glass transition temperature or curing temperature. The rapid cooling process can quickly "freeze" the slab compression shape and initial tack force generated by the resin during the pre-compressing stage, effectively solidifying the results of the pre-compressing process, namely compression deformation and initial bonding.

[0033] This greatly prevents or minimizes the secondary springback phenomenon that may occur in the slab after depressurization and during transportation, and significantly stabilizes the micro and macro structure of the slab, including density, thickness and the initial bonding network of internal fiber-resin. This makes the slab have higher dimensional stability and mechanical integrity before entering the final hot pressing process, thus providing an ideal and stable intermediate product for subsequent hot pressing, and further ensuring and improving the production quality, flatness and mechanical properties of the final flame-retardant board.

[0034] The workflow of this utility model is as follows: The heat transfer oil or saturated steam supply device is connected to the first pipeline interface and the second pipeline interface respectively to form a heating system pipeline. The cooling water supply device is connected to the cooling water inlet pipe 33 and the outlet pipe 31 to form a cooling system pipeline. When pre-pressing the high fiber flame retardant board, an appropriate amount of raw material is placed into the limiting groove 25. The heat medium enters the upper flow channel 23 and the lower flow channel 26 through the pipeline, heating the upper pressure plate 22 and the lower pressure plate 24 respectively. The cylinder 21 pushes the heated upper pressure plate 22 to move downward, extruding the material in the limiting groove 25. Under the action of the heated upper pressure plate 22 and the lower pressure plate 24, the raw material in the limiting groove 25 forms a slab. Once the pre-pressing process reaches the predetermined time, the system first cuts off the heat transfer medium to the upper and lower flow channels 26, stopping heating. Then, the cooling process is initiated: cooling water, typically at room temperature or low temperature, is pumped through the cooling water inlet pipe 33 into the loop pipe 32 embedded in the lower pressure plate 24. The low-temperature water flows within the loop pipe, efficiently exchanging heat with the high-temperature lower pressure plate 24 through the pipe wall, rapidly carrying away a large amount of heat from the lower pressure plate 24 and the lower half of the slab in contact with it. This process primarily involves rapid bottom cooling of the slab through conduction.

[0035] Meanwhile, external air supply equipment, such as a blower, injects cooling air into the hollow box 37 through the air supply pipe 35. The air can be either ambient temperature air or treated low temperature air. After the air pressure is equalized in the hollow box 37, it is blown evenly and vertically from a series of equally spaced air outlets 38 onto the upper surface and sides of the pre-pressed slab, thereby achieving forced convection heat transfer on the upper part of the slab. After cooling is complete, cylinder 21 retracts, causing the upper pressure plate 22 to move upward, thereby removing the formed blank for the next processing step.

[0036] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pre-compression device for producing high-fiber flame-retardant boards, characterized in that, include: Workbench (1), with a frame (4) fixedly connected to the top of the workbench (1); The pre-compression mechanism (2) includes a cylinder (21) mounted on a frame (4). The cylinder (21) is fixedly connected to an upper pressure plate (22) at its telescopic end. An upper flow channel (23) is provided inside the upper pressure plate (22), and both ends of the upper flow channel (23) extend outside the upper pressure plate (22). A lower pressure plate (24) is fixedly connected to the top of the workbench (1). A lower flow channel (26) is provided inside the lower pressure plate (24), and both ends of the lower flow channel (26) extend outside the lower pressure plate (24). The cooling mechanism (3) includes a loop tube (32) disposed inside the lower pressure plate (24). A cooling water inlet pipe (33) communicating with the inside of the loop tube (32) is provided on one side. A hollow box (37) is provided above the workbench (1). Air outlet holes (38) are provided on the outside of the hollow box (37) in a straight line with equal spacing.

2. The pre-compression device for producing high-fiber flame-retardant boards according to claim 1, characterized in that, The upper flow channel (23) is distributed in a curved shape inside the upper pressure plate (22), and both ends of the upper flow channel (23) are provided with a first pipeline interface.

3. The pre-compression device for producing high-fiber flame-retardant boards according to claim 1, characterized in that, The downflow channel (26) is distributed in a curved shape inside the pressure plate (24), and a second pipeline interface is provided at both ends of the downflow channel (26).

4. The pre-compression device for producing high-fiber flame-retardant boards according to claim 1, characterized in that, The lower pressure plate (24) has a limiting groove (25) on its top, and the upper pressure plate (22) is convex in shape, with the protrusion of the upper pressure plate (22) matching the inner wall of the limiting groove (25).

5. The pre-compression device for producing high-fiber flame-retardant boards according to claim 1, characterized in that, The top of the lower pressure plate (24) is provided with a spiral groove (34), and the spiral tube (32) is installed inside the spiral groove (34), with the top of the spiral tube (32) being horizontal to the top of the lower pressure plate (24).

6. The pre-compression device for producing high-fiber flame-retardant boards according to claim 1, characterized in that, The side of the loop pipe (32) away from the cooling water inlet pipe (33) is fixedly connected to an outlet pipe (31) that communicates with the inside of the loop pipe (32).

7. The pre-compression device for producing high-fiber flame-retardant boards according to claim 1, characterized in that, The bottom of the hollow box (37) is fixedly connected to two symmetrically distributed fixing rods (36). The end of the fixing rod (36) away from the hollow box (37) is fixedly connected to the workbench (1). An air supply pipe (35) communicating with the inside of the hollow box (37) is provided on the outside of the hollow box (37).

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