Plate hot-pressing device

Abstract

The invention relates to the field of plate hot pressing, and discloses a plate hot pressing device which comprises at least one set of hot pressing plate assemblies. The phase change heat storage tank is in thermal coupling connection with the hot pressing plate assembly and used for storing waste heat; the plate preheating bin is arranged at the feeding end of the hot pressing plate assembly and is in hot connection with the phase change heat storage tank; the hot pressing plate assembly sequentially comprises a pressing plate base body plate layer used for supporting a load and transmitting pressure to the surface of a plate; the micro-channel plate layer is internally provided with double flow channels, heating fluid and recycling fluid flow in different flow channels respectively, captured waste heat is stored in the phase change heat storage tank, and the micro-channel plate layer is fixedly arranged on the heat transfer surface of the pressing plate base body plate layer; and the heat insulation protection plate layer is fixedly arranged on the non-heat-transfer surface of the micro-channel plate layer. According to the hot press plate waste heat recovery system, in-situ capture and utilization of waste heat in the plate pressing-cooling process are achieved by constructing a micro-channel heat exchange network in the hot press plate, and the waste heat recovery efficiency is remarkably improved.

Description

Technical Field

[0001] This application relates to the field of hot pressing of plates, and particularly to a plate hot pressing device. Background Art

[0002] The plate hot pressing device is a core equipment in the processing of plates such as wood-based panels and composite panels. Its basic principle is to bond wood or composite materials into shape by heating and pressing. Generally, a hot pressing device usually consists of upper and lower hot pressing plates, a hydraulic drive system, a heating system, a temperature control unit, and a frame structure. Among them, the hot pressing plate, as a heat transfer component in direct contact with the plate, needs to maintain its surface temperature in the high temperature range of 180 - 250 °C to ensure the full curing of the adhesive.

[0003] However, in the process of implementing related technical solutions, it is found that there are at least the following technical problems: After the hot pressing plate completes pressing, it needs to be cooled naturally or forcedly. A large amount of waste heat stored in it (about 30% - 40% of the total energy consumption) is directly dissipated through air convection or cooling water, resulting in low energy utilization rate. Moreover, traditional hot pressing equipment has a large thermal inertia. The hot pressing plate adopts an overall heating method, and the heat during the cooling stage cannot be effectively recovered and utilized, exacerbating the energy waste during the start and stop of the equipment. Summary of the Invention

[0004] This application provides a plate hot pressing device, which solves the technical problem in the prior art that after the hot pressing plate completes pressing, it is cooled naturally or forcedly, and a large amount of waste heat stored in it is directly dissipated, resulting in low energy utilization rate. It realizes the in-situ capture and utilization of waste heat during the plate pressing-cooling process by constructing a microchannel heat exchange network inside the hot pressing plate, and significantly improves the waste heat recovery efficiency.

[0005] This application provides a plate hot pressing device, including: at least one set of hot pressing plate assemblies; a phase change heat storage tank, thermally coupled to the hot pressing plate assemblies for storing waste heat; a plate preheating bin, arranged at the feeding end of the hot pressing plate assemblies and thermally connected to the phase change heat storage tank; wherein, the hot pressing plate assemblies sequentially include: a pressing plate base plate layer, made of high-strength lightweight materials, for supporting the load and transferring pressure to the surface of the plate; a microchannel plate layer, made of high thermal conductivity materials, with a double flow channel built-in, and the heating fluid and the recovery fluid flow in different flow channels respectively. The heating fluid and the recovery fluid are respectively used to heat the plate layer and capture waste heat, and the captured waste heat is stored in the phase change heat storage tank. The microchannel plate layer is fixedly arranged on the heat transfer surface of the pressing plate base plate layer; a heat insulation protection plate layer, fixedly arranged on the non-heat transfer surface of the microchannel plate layer.

[0006] Furthermore, hot oil channels and laying channels are provided in the microchannel plate layer, and multiple hot oil channels are opened in parallel along the length direction of the plate body. The laying channels are adjacent to the hot oil channels and are parallel to each other. Multiple connecting grooves are connected between the hot oil channels and the laying channels. Movable heat exchange fins are placed in each connecting groove, and waste heat recovery heat exchange pipes that can move along the width direction of the laying channel are placed in the laying channel. The movable heat exchange fins are connected to the waste heat recovery heat exchange pipes. A driving mechanism for adjusting the insertion depth of the movable heat exchange fins in the hot oil channel is provided outside the microchannel plate layer.

[0007] Furthermore, a spare pipe is provided in the microchannel plate layer. The spare pipe is provided in the laying channel and arranged side by side with the waste heat recovery heat exchange pipe. The spare pipe and the waste heat recovery heat exchange pipe are connected to each other.

[0008] Furthermore, the substrate of the microchannel plate layer includes a base plate and a cover plate, and the movable heat exchange fins, waste heat recovery heat exchange tubes and spare tubes form an integral cover between the base plate and the cover plate, and the base plate and the cover plate are seamlessly connected by diffusion welding.

[0009] Furthermore, a heat flow transport main pipe is provided outside the microchannel plate layer, and a number of heat flow transport branches are provided on the heat flow transport main pipe, and each heat flow transport branch is used to be inserted into each hot oil channel; a recovery flow transport main pipe is also provided outside the microchannel plate layer, and a number of recovery flow transport branches are provided on the recovery flow transport main pipe, and each recovery flow transport branch is used to be inserted into each waste heat recovery heat exchange pipe; a spare transport main pipe is also provided outside the microchannel plate layer, and a number of spare transport branches are provided on the spare transport main pipe, and each spare transport branch is used to be inserted into each spare pipe.

[0010] Furthermore, the corners of the hot oil channel and the laying channel are arc-shaped, and the end of the movable heat exchange fin inserted into the hot oil channel is also arc-shaped. The cross-section formed between the arc-shaped end of the movable heat exchange fin and the side opposite to the hot oil channel is elliptical.

[0011] Furthermore, a welt is fixed at one end of the movable heat exchange fin inserted into the hot oil channel. When the movable heat exchange fin is moved to the state of laying the channel, the welt is used to fit with the side wall of the hot oil channel, and the welt is used to prevent the heating fluid from entering the connecting groove.

[0012] Furthermore, a sealing ring is provided at the end of the paving channel in the microchannel plate layer, a short tube is provided inside the sealing ring, and a deformable laminated rubber sheet is provided between the short tube and the side wall of the sealing ring.

[0013] Furthermore, the plate preheating bin includes: a conveyor roller, at least three temperature zones arranged along the material conveying direction; a fin-tube heat exchanger embedded inside the roller of the conveyor roller; and a temperature zone controller, which is connected to the temperature gradient controller signal of the phase change heat storage tank.

[0014] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0015] Adopting the in-layer dual-channel parallel design of the microchannel plate (hot oil channel + laying channel), combined with the lateral displacement adjustment of the movable heat exchange fins, realizes efficient heat conduction in the heating stage and rapid waste heat recovery in the cooling stage, significantly reducing the energy loss caused by thermal inertia;

[0016] Through the linkage design of the phase change heat storage tank and the multi-temperature zone preheating bin, the recovered waste heat is distributed to the low-temperature, medium-temperature, and high-temperature preheating zones according to the temperature gradient, realizing the gradual heating of the core layer of the plate and reducing the heat energy demand in the hot pressing stage;

[0017] From the dynamic pressure heating in the pressing stage, to the rapid heat absorption of the nanofluid in the waste heat recovery stage, and then to the gradient heat energy reuse in the preheating bin, a closed-loop link of "heating - recovery - regeneration" is formed, systematically reducing the external energy dependence. Brief Description of the Drawings

[0018] Figure 1 It is a schematic connection diagram among the hot pressing plate assembly, the phase change heat storage tank, and the plate preheating bin in the embodiment of this application;

[0019] Figure 2 It is a schematic structural diagram of the microchannel plate layer in the hot pressing plate assembly in the embodiment of this application;

[0020] Figure 3 For Figure 2 Schematic diagram of partial structures in

[0021] Figure 4 It is a schematic diagram after the width of the hot oil channel is reduced when the movable heat exchange fin moves to the hot oil channel in the embodiment of this application;

[0022] Figure 5 It is a schematic diagram after the width of the hot oil channel is widened when the movable heat exchange fin returns to the communication groove in the embodiment of this application;

[0023] Figure 6 For Figure 1 Schematic diagram of partial structures in

[0024] Figure 7 For Figure 6 Explosion schematic diagram of partial structures in

[0025] In the figure: 1. Hot pressing plate assembly; 11. Pressing plate base plate layer; 12. Micro-channel plate layer; 121. Hot oil channel; 122. Laying channel; 123. Connecting groove; 124. Movable heat exchange fin; 125. Waste heat recovery heat exchange tube; 126. Spare tube; 127. Main heat flow conveying pipe; 1271. Branch heat flow conveying pipe; 128. Main recovery flow conveying pipe; 1281. Branch recovery flow conveying pipe; 1291. Spare branch conveying pipe; 1201. Base plate; 1202. Cover plate; 13. Heat insulation and protection plate layer; 2. Phase change heat storage tank; 3. Plate preheating bin; 4. Sealing ring; 41. Short pipe; 42. Rubber sheet. Detailed implementation mode

[0026] To better understand the technical solution of the present application, the above technical solution will be described in detail below in conjunction with the specification drawings and specific implementation modes.

[0027] Refer to Figure 1 , a plate hot pressing device, including a hot pressing plate assembly 1, a phase change heat storage tank 2, and a plate preheating bin 3. At least one group of hot pressing plate assemblies 1 is provided, specifically, two groups can be provided. One group is fixed and serves as the lower hot pressing plate assembly 1, and the other group of hot pressing plate assemblies 1 is installed on the movable crossbeam of the hydraulic drive system and serves as the upper hot pressing plate assembly 1. The two groups of hot pressing plate assemblies 1 apply pressure and heat to the upper and lower surfaces of the plate. The phase change heat storage tank 2 is thermally coupled to the hot pressing plate assembly 1 for storing waste heat. The plate preheating bin 3 is arranged at the feeding end of the hot pressing plate assembly 1 and is thermally connected to the phase change heat storage tank 2.

[0028] Refer to Figure 2 and Figure 3 , the hot pressing plate assembly 1 successively includes a pressing plate base plate layer 11, a micro-channel plate layer 12, and a heat insulation and protection plate layer 13.

[0029] The pressing plate base plate layer 11 can be made of high-strength lightweight aluminum alloy, formed by numerically controlled milling machine, with a thickness of 20 mm, a surface flatness error ≤ 0.05 mm, and a 0.2 mm thick aluminum nitride coating is sprayed on the heat transfer surface to enhance the thermal conductivity.

[0030] The heat insulation and protection plate layer 13 can adopt a composite layer structure, including a ceramic fiber layer, an aerogel felt layer, and a stainless steel protection layer. The ceramic fiber layer is attached to the non-heat transfer surface of the micro-channel plate layer 12 through a high-temperature resistant adhesive; the aerogel felt layer covers the outside of the ceramic fiber layer; the stainless steel protection layer covers the aerogel felt layer and is fixed by riveting.

[0031] The microchannel plate layer 12 can be made of a copper alloy, and the total thickness can be 15 mm. The microchannel plate layer 12 includes a base plate 1201 and a cover plate 1202, and the two form a sealed cavity through diffusion welding. Inside the microchannel plate layer 12, there are arranged a hot oil channel 121, a laying channel 122, and a connecting groove 123. Both the hot oil channel 121 and the laying channel 122 are arranged along the length direction of the plate body. There are multiple hot oil channels 121 and laying channels 122 that are parallel to each other. The connecting groove 123 is vertically arranged between the hot oil channel 121 and the laying channel 122. The connecting groove 123 connects the hot oil channel 121 and the laying channel 122 to each other, and there are multiple connecting grooves 123 arranged at equal intervals along the length direction of the hot oil channel 121 and the laying channel 122. A movable heat exchange fin 124 is arranged in each connecting groove 123, and the material of the movable heat exchange fin 124 can be a copper-aluminum composite plate. A waste heat recovery heat exchange tube 125 and a spare tube 126 are placed in the laying channel 122. The waste heat recovery heat exchange tube 125 and the spare tube 126 are arranged in parallel and connected to each other. The waste heat recovery heat exchange tube 125 is on the side closer to the hot oil channel 121. The transverse length of the laying channel 122 is greater than the transverse length after the parallel connection of the waste heat recovery heat exchange tube 125 and the spare tube 126. Therefore, the waste heat recovery heat exchange tube 125 and the spare tube 126 can move along the transverse width direction of the laying channel 122 after being connected in parallel. In addition, one end of the movable heat exchange fin 124 close to the laying channel 122 is fixedly connected to the outer wall of the waste heat recovery heat exchange tube 125. Therefore, the transverse movement of the waste heat recovery heat exchange tube 125 can drive the movable heat exchange fin 124 to move transversely as well. The heating fluid can be high-temperature heat-conducting oil, and the recovery fluid can be nanofluid. The heating fluid flows in the hot oil channel 121 and heats the pressing plate base plate layer 11 through the microchannel plate layer 12. The recovery fluid flows in the waste heat recovery heat exchange tube 125. The nanofluid is a fluid with high heat transfer efficiency and has a high heat recovery efficiency.

[0032] Referring again to Figure 4 and Figure 5 , the corners of both the hot oil channel 121 and the laying channel 122 are arc-shaped. One end of the movable heat exchange fin 124 inserted into the hot oil channel 121 is also arc-shaped. An ellipse is formed between the arc-shaped end of the movable heat exchange fin 124 and the opposite side surface of the hot oil channel 121. The circular arc-shaped corner design of the hot oil channel 121 and the laying channel 122 reduces the flow resistance and avoids local overheating caused by turbulence, which can ensure the smooth flow of the heating fluid. A side strip is fixed at one end of the movable heat exchange fin 124 inserted into the hot oil channel 121. When the movable heat exchange fin 124 moves to the laying channel 122, the side strip is used to fit with the side wall of the hot oil channel 121, and the side strip is used to prevent the heating fluid from entering the connecting groove 123.

[0033] Referring again to Figure 6 and Figure 7, outside the microchannel plate layer 12, there is also a main heat flow delivery pipe 127. A number of heat flow delivery branch pipes 1271 are provided on the main heat flow delivery pipe 127. Each heat flow delivery branch pipe 1271 is used to be inserted into each hot oil channel 121. Thus, the heating fluid can be first pumped into the main heat flow delivery pipe 127, then input from the main heat flow delivery pipe 127 into each heat flow delivery branch pipe 1271, and finally enter each hot oil channel 121. Outside the microchannel plate layer 12, there is also a main recovery flow delivery pipe 128. A number of recovery flow delivery branch pipes 1281 are provided on the main recovery flow delivery pipe 128. Each recovery flow delivery branch pipe 1281 is used to be inserted into each waste heat recovery heat exchange tube 125. Thus, the recovery fluid can be first pumped into the main recovery flow delivery pipe 128, then input from the main recovery flow delivery pipe 128 into the recovery flow delivery branch pipe 1281, and finally enter each waste heat recovery heat exchange tube 125. Outside the microchannel plate layer 12, there is also a standby delivery main pipe. A number of standby delivery branch pipes 1291 are provided on the standby delivery main pipe. Each standby delivery branch pipe 1291 is used to be inserted into each standby pipe 126. The standby pipe 126 can be used as the flow pipe for the heating fluid or the flow pipe for the recovery fluid according to the heating demand and the waste heat recovery demand. In addition, a sealing ring 4 is provided at the end of the laying channel 122 in the microchannel plate layer 12. A short pipe 41 is provided inside the sealing ring 4. A deformable laminated rubber sheet 42 is provided between the short pipe 41 and the side wall of the sealing ring 4. The sealing ring 4 can be used to make the two ends of the laying channel 122 in a sealed state, improving the sealing performance of the laying channel 122. Further, an electric push cylinder can be provided on the non-pressing surface of the hot press plate assembly 1 for pushing the lateral movement of the waste heat recovery heat exchange tube 125, and as Figure 5 and Figure 6 shown are two of the states after the movement.

[0034] The heat storage pipe body in the phase change heat storage tank 2 can adopt a 316L stainless steel pipe, filled with a phase change material core, with a composition of 70% paraffin matrix, 20% expanded graphite, 8% carbon nanotubes, and 2% nucleating agent. A nano-graphene coating can be sprayed on the outer wall of the heat storage pipe body to improve the thermal conductivity. The waste heat recovery heat exchange tube 125 absorbs the waste heat of the hot oil channel 121, and the recovered hot water is transported to the phase change heat storage tank 2, and the paraffin-based phase change material in the tank completes the thermal energy storage.

[0035] The sheet preheating bin 3 can be set with multiple temperature zones, specifically, a low-temperature zone, a medium-temperature zone, and a high-temperature zone can be set. The low-temperature zone can be set at a temperature of 90°C, with a residence time of 2 minutes for the sheet, and the core layer is preheated to 60°C; the medium-temperature zone can be set at a temperature of 120°C, with a residence time of 3 minutes, and the core layer is heated up to 90°C; the high-temperature zone can be set at a temperature of 150°C, with a residence time of 2 minutes, and after the core layer reaches 120°C, it enters the hot pressing process. Spiral finned tubes are embedded inside the conveying rollers in the sheet preheating bin 3, and the surface of the conveying rollers can be coated with a thermal conductive silicone grease layer to ensure uniform heat transfer to the sheet. The phase change heat storage tank 2 is connected to the spiral finned tubes of the sheet preheating bin 3 through a heat preservation pipeline. The temperature gradient controller adjusts the opening degree of the branch valves according to the requirements of the sheet preheating bin 3 to achieve the control of different temperature zones, and distributes the recovered waste heat to the low-temperature, medium-temperature, and high-temperature preheating zones according to the temperature gradient, realizing the gradual heating of the core layer of the sheet and reducing the heat energy demand in the hot pressing stage.

[0036] The functional principle of the present application can be described through the following operation methods:

[0037] Heating of the hot pressing plate assembly 1: The heating fluid (highly thermally conductive oil) is first pumped into the main heat flow conveying pipe 127, then input from the main heat flow conveying pipe 127 to each heat flow conveying branch pipe 1271, and finally enters each hot oil channel 121. The heating fluid (highly thermally conductive oil) circulates in the hot oil channels 121 of the microchannel plate layer 12, and conducts heat to the pressing plate base plate layer 11 through the copper alloy base plate 1201. The surface aluminum nitride coating further enhances heat conduction to ensure uniform temperature on the contact surface of the sheet.

[0038] Waste heat recovery channel: The recovery fluid (nanofluid) flows in the waste heat recovery heat exchange tube 125, absorbs the radiant waste heat of the hot oil channel 121, and realizes heat energy storage through the phase change heat storage tank 2.

[0039] Reutilization of waste heat: The heat storage tank provides gradient heat energy to the sheet preheating bin 3 through spiral finned tubes, enabling preheating of the core layer of the sheet before hot pressing and reducing the energy consumption during sheet pressing.

[0040] Dynamic adjustment of the movable heat exchange fins 124: The movable heat exchange fins 124 drive the lateral movement of the waste heat recovery heat exchange tube 125 through an electric push cylinder, thereby driving the lateral displacement of the movable heat exchange fins 124 and changing the depth of the movable heat exchange fins 124 inserted into the hot oil channel 121. When the movable heat exchange fins 124 are fully inserted, the area occupied by the movable heat exchange fins 124 in the hot oil channel 121 increases, increasing the heat exchange area of the waste heat recovery heat exchange tube 125 and improving the waste heat recovery efficiency. Moreover, the width of the hot oil channel 121 can also be changed by changing the depth of the movable heat exchange fins 124 inserted into the hot oil channel 121, changing the flow rate of the heating fluid in the hot oil channel 121, and also changing the heating rate of the pressing plate base plate layer 11, realizing the temperature adjustment of the pressing plate base plate layer 11.

[0041] Spare pipe 126: According to the heating demand and waste heat recovery demand, spare pipe 126 can be used as a flow pipe for heating fluid to extend the waste heat recovery cycle. Spare pipe 126 can also be used as a flow pipe for recovery fluid to ensure continuous production.

[0042] Therefore, the plate hot pressing device of the present application realizes efficient heating and waste heat recovery through a multi-stage thermal energy circulation system and a dynamic thermal management structure, and constructs a full-cycle energy-saving system of "heating-pressing-recovery-preheating". Through the linkage design of the phase change heat storage tank and the multi-temperature zone preheating bin, the recovered waste heat is distributed to the low-temperature, medium-temperature, and high-temperature preheating zones according to the temperature gradient, so as to realize the step-by-step heating of the core layer of the plate and reduce the heat energy demand in the hot pressing stage. It not only solves the core pain points of large thermal inertia and waste heat waste of traditional equipment, but also achieves multi-dimensional breakthroughs in process efficiency, product quality and environmental protection, providing the artificial board industry with a set of upgrade solutions that are both economical and technologically advanced, and helping the green transformation of the manufacturing industry under the "dual carbon" goal.

[0043] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

[0044] The above is only a preferred specific implementation method of the embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and concept of the present application within the technical scope disclosed in the present application, and they should be covered by the scope of protection of the present application.

Claims

1. A hot pressing device for a board, characterized in that, Comprising: At least one set of hot press plate assemblies (1); A phase change heat storage tank (2), thermally coupled to the hot press plate assembly (1) for storing waste heat; A sheet preheating bin (3), arranged at the feeding end of the hot press plate assembly (1) and thermally connected to the phase change heat storage tank (2); Wherein, the hot press plate assembly (1) successively comprises: A press plate base plate layer (11), made of high-strength lightweight material, for supporting the load and transferring pressure to the sheet surface; A microchannel plate layer (12), made of high thermal conductivity material, with a double-flow channel built-in, the heating fluid and the heat recovery fluid flow in different channels respectively, the heating fluid and the heat recovery fluid are respectively used for heating the plate layer and capturing waste heat, the captured waste heat is stored in the phase change heat storage tank (3), and the microchannel plate layer (12) is fixedly arranged on the heat transfer surface of the press plate base plate layer (11); A heat insulation protection plate layer (13), fixedly arranged on the non-heat transfer surface of the microchannel plate layer (12).

2. The hot pressing device for a board according to claim 1, characterized in that, An oil heating channel (121) and a laying channel (122) are arranged in the microchannel plate layer (12), a plurality of oil heating channels (121) are arranged in parallel along the length direction of the plate body, the laying channel (122) is arranged adjacent to and parallel to the oil heating channel (121), a plurality of connecting grooves (123) are communicated between the oil heating channel (121) and the laying channel (122), a movable heat exchange fin (124) is placed in each connecting groove (123), a waste heat recovery heat exchange tube (125) that can move along the width direction of the laying channel (122) is placed in the laying channel (122), the movable heat exchange fin (124) is connected to the waste heat recovery heat exchange tube (125), and a driving mechanism for adjusting the insertion depth of the movable heat exchange fin (124) in the oil heating channel (121) is arranged outside the microchannel plate layer (12).

3. A hot pressing device for a plate according to claim 2, characterized in that, A spare tube (126) is further arranged in the microchannel plate layer (12), the spare tube (126) is arranged in the laying channel (122) and arranged side by side with the waste heat recovery heat exchange tube (125), and the spare tube (126) is connected to the waste heat recovery heat exchange tube (125).

4. A hot pressing device for a board according to claim 3, characterized in that, The base plate of the microchannel plate layer (12) comprises a base plate (1201) and a cover plate (1202), the whole formed by the movable heat exchange fin (124), the waste heat recovery heat exchange tube (125) and the spare tube (126) is covered between the base plate (1201) and the cover plate (1202), and the base plate (1201) and the cover plate (1202) are seamlessly connected by diffusion welding.

5. The hot pressing device for a plate according to claim 3, characterized in that, Outside the microchannel plate layer (12), a main heat flow conveying pipe (127) is provided. A number of heat flow conveying branch pipes (1271) are provided on the main heat flow conveying pipe (127), and each of the heat flow conveying branch pipes (1271) is used to be inserted into each hot oil channel (121); outside the microchannel plate layer (12), a main recovery flow conveying pipe (128) is also provided. A number of recovery flow conveying branch pipes (1281) are provided on the main recovery flow conveying pipe (128), and each of the recovery flow conveying branch pipes (1281) is used to be inserted into each waste heat recovery heat exchange tube (125); outside the microchannel plate layer (12), a main spare conveying pipe (129) is further provided. A number of spare conveying branch pipes (1291) are provided on the main spare conveying pipe (129), and each of the spare conveying branch pipes (1291) is used to be inserted into each spare pipe (126).

6. The hot pressing device for a board according to claim 2, characterized in that, The corners of the hot oil channel (121) and the laying channel (122) are both arc-shaped. One end of the movable heat exchange fin (124) inserted into the hot oil channel (121) is also arc-shaped. An ellipse is formed between the arc-shaped end of the movable heat exchange fin (124) and the opposite side surface of the hot oil channel (121).

7. The hot pressing device for a board according to claim 2, characterized in that, One end of the movable heat exchange fin (124) inserted into the hot oil channel (121) is fixed with a hemming (1241). When the movable heat exchange fin (124) moves to the laying channel (122), the hemming (1241) is used to fit with the side wall of the hot oil channel (121), and the hemming (1241) is used to prevent the heating fluid from entering the communication groove (123).

8. The hot pressing device for a board according to claim 2, wherein At the end of the laying channel (122) in the microchannel plate layer (12), a sealing ring (4) is provided. A short pipe (41) is arranged inside the sealing ring (4), and a deformable and laminated rubber sheet (42) is arranged between the short pipe (41) and the side wall of the sealing ring (4).

9. A hot pressing device for a board according to claim 1, characterized in that, The sheet material preheating bin (3) includes: A conveying roller path and at least three temperature zones arranged along the material conveying direction; A finned tube heat exchanger embedded inside the roller of the conveying roller path; A temperature zone controller, which is in signal connection with the temperature gradient controller of the phase change heat storage tank (2).

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