A sheet metal hot pressing device

Abstract

This application relates to the field of hot pressing of sheet metal and discloses a sheet metal hot pressing device, comprising: a hot pressing plate assembly, at least one set; a phase change heat storage tank, thermally coupled to the hot pressing plate assembly for storing waste heat; and a sheet metal preheating chamber, disposed at the feed end of the hot pressing plate assembly and thermally connected to the phase change heat storage tank. The hot pressing plate assembly sequentially includes: a pressing plate substrate layer for supporting loads and transmitting pressure to the sheet metal surface; a microchannel plate layer with built-in dual flow channels, in which heating fluid and recovery fluid flow respectively, and the captured waste heat is stored in the phase change heat storage tank, the microchannel plate layer being fixedly disposed on the heat transfer surface of the pressing plate substrate layer; and a heat insulation protection plate layer fixedly disposed on the non-heat transfer surface of the microchannel plate layer. This application achieves in-situ capture and utilization of waste heat during the sheet metal pressing-cooling process by constructing an internal microchannel heat exchange network within the hot pressing plate, significantly improving waste heat recovery efficiency.

Description

Technical Field

[0001] This application relates to the field of hot pressing of sheet metal, and more particularly to a sheet metal hot pressing apparatus. Background Technology

[0002] Hot pressing equipment is a core component in the processing of engineered wood products, composite boards, and other wood-based panels. Its basic principle is to bond wood or composite materials together through heating and pressure. A typical hot pressing device consists of upper and lower hot pressing plates, a hydraulic drive system, a heating system, a temperature control unit, and a frame structure. The hot pressing plates, as the heat transfer components in direct contact with the panels, must maintain a surface temperature between 180-250℃ to ensure the adhesive fully cures.

[0003] However, during the implementation of the relevant technical solutions, at least the following technical problems were found: After the hot press plate is pressed, it needs to be cooled naturally or forcibly. The large amount of residual heat stored in it (accounting for about 30%-40% of the total energy consumption) is directly dissipated through air convection or cooling water, resulting in low energy utilization. In addition, traditional hot press equipment has a large thermal inertia. The hot press plate adopts an overall heating method, and the heat during the cooling stage cannot be effectively recovered and utilized, which aggravates the energy waste during equipment start-up and shutdown. Summary of the Invention

[0004] This application provides a hot pressing device for sheet metal, which solves the technical problem in the prior art where a large amount of residual heat stored in the hot pressing plate is directly lost after natural cooling or forced cooling, resulting in low energy utilization. It realizes the in-situ capture and utilization of residual heat during the pressing and cooling process of the sheet metal by constructing a microchannel heat exchange network inside the hot pressing plate, which significantly improves the efficiency of residual heat recovery.

[0005] This application provides a hot pressing device for sheet metal, comprising: a hot pressing plate assembly, at least one set; a phase change heat storage tank, thermally coupled to the hot pressing plate assembly, for storing waste heat; and a sheet metal preheating chamber, disposed at the feed end of the hot pressing plate assembly and thermally connected to the phase change heat storage tank. The hot pressing plate assembly sequentially comprises: a pressing plate substrate layer, made of high-strength and lightweight material, for supporting loads and transmitting pressure to the sheet metal surface; a microchannel layer, made of high thermal conductivity material, with built-in dual flow channels, where heating fluid and recovery fluid flow in different channels respectively, the heating fluid and recovery fluid being used to heat the plate layer and capture waste heat respectively, the captured waste heat being stored in the phase change heat storage tank, the microchannel layer being fixedly disposed on the heat transfer surface of the pressing plate substrate layer; and a heat insulation protection layer, fixedly disposed on the non-heat transfer surface of the microchannel layer.

[0006] Furthermore, the microchannel plate is provided with hot oil channels and laying channels. Multiple hot oil channels are opened parallel to each other along the length of the plate. The laying channels are adjacent to and parallel to the hot oil channels. Multiple connecting slots connect the hot oil channels and the laying channels. Each connecting slot contains a movable heat exchange fin. A waste heat recovery heat exchange tube that can move along the width of the laying channel is placed in the laying channel. The movable heat exchange fin is connected to the waste heat recovery heat exchange tube. A drive mechanism is provided outside the microchannel plate to adjust the insertion depth of the movable heat exchange fin in the hot oil channel.

[0007] Furthermore, a spare tube is also provided within the microchannel plate layer. The spare tube is located within the laying channel and is arranged side by side with the waste heat recovery heat exchange tube. The spare tube and the waste heat recovery heat exchange tube are interconnected.

[0008] Furthermore, the substrate of the microchannel plate includes a base plate and a cover plate. The movable heat exchange fins, waste heat recovery heat exchange tubes and spare tubes are integrally covered 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 main heat flow transmission pipe is provided outside the microchannel plate layer, and several heat flow transmission branch pipes are provided on the main heat flow transmission pipe, each heat flow transmission branch pipe is used to be inserted into each hot oil channel; a recovery flow transmission main pipe is also provided outside the microchannel plate layer, and several recovery flow transmission branch pipes are provided on the recovery flow transmission main pipe, each recovery flow transmission branch pipe is used to be inserted into each waste heat recovery heat exchange tube; a backup transmission main pipe is also provided outside the microchannel plate layer, and several backup transmission branch pipes are provided on the backup transmission main pipe, each backup transmission branch pipe is used to be inserted into each backup tube.

[0010] Furthermore, the corners of the hot oil channel and the laying channel are both 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 the hot oil channel is elliptical.

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

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

[0013] Furthermore, the plate preheating chamber includes: a conveyor roller conveyor with at least three temperature zones set along the material conveying direction; a finned tube heat exchanger embedded inside the rollers of the conveyor roller conveyor; and a temperature zone controller connected to the temperature gradient controller 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] The microchannel plate adopts a dual-channel parallel design (hot oil channel + laying channel), combined with the lateral displacement adjustment of movable heat exchange fins, to achieve efficient heat conduction in the heating stage and rapid waste heat recovery in the cooling stage, significantly reducing energy loss due to thermal inertia.

[0016] Through the linkage design of phase change heat storage tank and multi-temperature zone preheating chamber, the recovered waste heat is distributed to low temperature, medium temperature and high temperature preheating zones according to the temperature gradient, so as to realize the gradual heating of the core layer of the board and reduce the heat energy demand in the hot pressing stage.

[0017] From dynamic pressure heating in the pressing stage to rapid heat absorption by nanofluids in the waste heat recovery stage, and then to gradient thermal energy reuse in the preheating chamber, a closed-loop "heating-recovery-regeneration" chain is formed, systematically reducing dependence on external energy. Attached Figure Description

[0018] Figure 1 This is a schematic diagram showing the connection relationship between the hot press plate assembly, the phase change heat storage tank, and the plate preheating chamber in the embodiments of this application;

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

[0020] Figure 3 for Figure 2 A schematic diagram of the middle section structure;

[0021] Figure 4 This is a schematic diagram showing the reduction in the width of the hot oil channel after the movable heat exchange fins are moved to the hot oil channel in the embodiments of this application;

[0022] Figure 5 This is a schematic diagram of the widened hot oil channel after the movable heat exchange fins return to the connecting groove in this embodiment of the application;

[0023] Figure 6 for Figure 1 A schematic diagram of the middle section structure;

[0024] Figure 7 for Figure 6 Explosion diagram of the middle section;

[0025] In the diagram: 1. Hot press plate assembly; 11. Press plate substrate layer; 12. Microchannel layer; 121. Hot oil channel; 122. Laying channel; 123. Connecting groove; 124. Movable heat exchange fins; 125. Waste heat recovery heat exchange tube; 126. Spare tube; 127. Main heat flow transmission pipe; 1271. Branch heat flow transmission pipe; 128. Main heat recovery transmission pipe; 1281. Branch heat recovery transmission pipe; 1291. Spare transmission branch pipe; 1201. Base plate; 1202. Cover plate; 13. Thermal insulation protection layer; 2. Phase change heat storage tank; 3. Plate preheating chamber; 4. Sealing ring; 41. Short pipe; 42. Rubber sheet. Detailed Implementation

[0026] To better understand the technical solution of this application, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Reference Figure 1 A sheet metal hot pressing device includes a hot pressing plate assembly 1, a phase change heat storage tank 2, and a sheet metal preheating chamber 3. At least one set of hot pressing plate assemblies 1 is provided, specifically two sets. One set is fixed and serves as the lower hot pressing plate assembly 1, while the other set is mounted on a movable crossbeam of a hydraulic drive system and serves as the upper hot pressing plate assembly 1. The two sets of hot pressing plate assemblies 1 apply pressure and heat to the upper and lower surfaces of the sheet metal. The phase change heat storage tank 2 is thermally coupled to the hot pressing plate assembly 1 and is used to store residual heat. The sheet metal preheating chamber 3 is located at the feed end of the hot pressing plate assembly 1 and is thermally connected to the phase change heat storage tank 2.

[0028] Reference Figure 2 and Figure 3 The hot press plate assembly 1 includes, in sequence, a press plate substrate layer 11, a microchannel layer 12, and a heat insulation protection layer 13.

[0029] The pressure plate substrate layer 11 can be made of high-strength lightweight aluminum alloy, which is formed by CNC milling. The thickness can be 20mm, the surface flatness error is ≤0.05mm, and the heat transfer surface is sprayed with a 0.2mm thick aluminum nitride coating to enhance 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 protective layer. The ceramic fiber layer is attached to the non-heat transfer surface of the microchannel plate layer 12 with a high-temperature resistant adhesive; the aerogel felt layer covers the outside of the ceramic fiber layer; and the stainless steel protective layer covers the aerogel felt layer and is fixed by riveting.

[0031] The microchannel plate 12 can be made of copper alloy with a total thickness of 15mm. The microchannel plate 12 includes a base plate 1201 and a cover plate 1202, which are formed into a sealed cavity by diffusion welding. The microchannel plate 12 is provided with hot oil channels 121, laying channels 122, and connecting grooves 123. The hot oil channels 121 and laying channels 122 are both opened along the length of the plate. There are multiple hot oil channels 121 and laying channels 122 that are parallel to each other. The connecting grooves 123 are vertically arranged between the hot oil channels 121 and laying channels 122, and the connecting grooves 123 connect the hot oil channels 121 and laying channels 122 to each other. Multiple connecting grooves 123 are equidistantly arranged along the length of the hot oil channels 121 and laying channels 122. Each connecting groove 123 is provided with a movable heat exchange fin 124, which can be made of copper-aluminum composite plate. Waste heat recovery heat exchange tube 125 and spare tube 126 are placed in the laying channel 122. The waste heat recovery heat exchange tube 125 and spare tube 126 are arranged in parallel and connected to each other. The waste heat recovery heat exchange tube 125 is closer to the hot oil channel 121. The lateral length of the laying channel 122 is greater than the lateral length of the waste heat recovery heat exchange tube 125 and spare tube 126 after being connected in parallel. Therefore, the waste heat recovery heat exchange tube 125 and spare tube 126 can move along the lateral width of the laying channel 122 after being connected in parallel. In addition, the movable heat exchange fin 124 is fixedly connected to the outer wall of the waste heat recovery heat exchange tube 125 at one end near the laying channel 122. Therefore, the lateral movement of the waste heat recovery heat exchange tube 125 can drive the movable heat exchange fin 124 to move laterally as well. The heating fluid can be high-heat-conducting oil, and the recovery fluid can be nanofluid. The heating fluid flows in the hot oil channel 121 and heats the pressure plate substrate 11 through the microchannel plate 12. The recovery fluid flows in the waste heat recovery heat exchange tube 125. The nanofluid is a high-heat-transfer-efficiency fluid with high heat recovery efficiency.

[0032] Refer to Figure 4 and Figure 5 The corners of both the hot oil channel 121 and the laying channel 122 are arc-shaped. The end of the movable heat exchange fin 124 inserted into the hot oil channel 121 is also arc-shaped. The arc-shaped end of the movable heat exchange fin 124 and the opposite side of the hot oil channel 121 form an elliptical cross-section. The arc-shaped corner design of the hot oil channel 121 and the laying channel 122 reduces flow resistance, avoids localized overheating caused by turbulence, and ensures smooth flow of the heating fluid. An edge 1241 is fixed to the end of the movable heat exchange fin 124 inserted into the hot oil channel 121. When the movable heat exchange fin 124 is moved to the laying channel 122, the edge 1241 is used to fit against the side wall of the hot oil channel 121, preventing the heating fluid from entering the connecting groove 123.

[0033] Refer to Figure 6 and Figure 7 Outside the microchannel plate layer 12, a main heat flow transmission pipe 127 is also provided. Several heat flow transmission branch pipes 1271 are provided on the main heat flow transmission pipe 127. Each heat flow transmission branch pipe 1271 is inserted into each hot oil channel 121. Thus, the heating fluid can first be pumped into the main heat flow transmission pipe 127, then input from the main heat flow transmission pipe 127 to each heat flow transmission branch pipe 1271, and finally enter each hot oil channel 121. Outside the microchannel plate layer 12, a recovery flow transmission pipe 128 is also provided. Several recovery flow transmission branch pipes 1281 are provided on the recovery flow transmission pipe 128. Each recovery flow transmission branch pipe 1281 is inserted into each waste heat recovery heat exchanger 125. Thus, the recovery fluid can first be pumped into the recovery flow transmission pipe 128, then input from the recovery flow transmission pipe 128 to the recovery flow transmission branch pipes 1281, and finally enter each waste heat recovery heat exchanger 125. A spare main conveying pipe is also provided outside the microchannel plate layer 12. Several spare branch pipes 1291 are provided on the spare main conveying pipe, each of which is inserted into a spare pipe 126. The spare pipe 126 can serve as a flow channel for heating fluid or for recovering fluid, depending on heating and waste heat recovery requirements. Furthermore, 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, and a deformable, stacked rubber sheet 42 is provided between the short pipe 41 and the sidewall of the sealing ring 4. The sealing ring 4 ensures that both ends of the laying channel 122 are sealed, improving the sealing performance of the laying channel 122. Further, an electric pusher cylinder can be provided on the non-pressing surface of the hot press plate assembly 1 to push the waste heat recovery heat exchange tube 125 laterally, and as... Figure 5 and Figure 6 The image shows two of the states after the movement.

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

[0035] The preheating chamber 3 for the sheet metal can be set with multiple temperature zones, specifically a low-temperature zone, a medium-temperature zone, and a high-temperature zone. The low-temperature zone can be set to 90℃, with a 2-minute residence time for the sheet metal, preheating the core layer to 60℃. The medium-temperature zone can be set to 120℃, with a 3-minute residence time for the core layer, raising it to 90℃. The high-temperature zone can be set to 150℃, with a 2-minute residence time; after the core layer reaches 120℃, it enters the hot-pressing process. The conveyor rollers inside the preheating chamber 3 are fitted with spiral finned tubes, and the surface of the conveyor rollers can be covered with a thermally conductive silicone grease layer to ensure uniform heat transfer to the sheet metal. The phase-change heat storage tank 2 is connected to the spiral finned tubes of the preheating chamber 3 via insulated pipes. The temperature gradient controller adjusts the opening of the branch valves according to the needs of the preheating chamber 3 to control different temperature zones, distributing the recovered waste heat according to the temperature gradient to the low-temperature, medium-temperature, and high-temperature preheating zones, achieving gradual heating of the sheet metal core layer and reducing the heat energy demand during the hot-pressing stage.

[0036] The functional principle of this application can be explained through the following methods:

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

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

[0039] Waste heat reuse: The heat storage tank provides gradient heat energy to the preheating chamber 3 of the sheet through spiral finned tubes, so that the core layer of the sheet is preheated before entering the hot pressing, reducing the energy consumption during sheet pressing.

[0040] The movable heat exchange fins 124 are dynamically adjustable: the movable heat exchange fins 124 are driven by an electric push cylinder to move the waste heat recovery heat exchange tube 125 laterally, thereby causing the movable heat exchange fins 124 to shift laterally and change 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, thereby increasing the heat exchange area of ​​the waste heat recovery heat exchange tube 125 and improving the efficiency of waste heat recovery. 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, which changes the flow rate of the heating fluid in the hot oil channel 121 and also changes the heating rate of the pressure plate substrate 11, thus realizing the temperature adjustment of the pressure plate substrate 11.

[0041] Backup pipe 126: Depending on the heating requirements and waste heat recovery requirements, backup pipe 126 can be used as a flow pipe for heating fluid to extend the waste heat recovery cycle. Backup pipe 126 can also be used as a flow pipe for recovery fluid to ensure continuous production.

[0042] Therefore, the hot pressing device for boards in this application achieves efficient heating and waste heat recovery through a multi-stage thermal energy circulation system and dynamic thermal management structure, constructing a full-cycle energy-saving system of "heating-pressing-recovery-preheating". Through the linkage design of phase change heat storage tank and multi-temperature zone preheating chamber, the recovered waste heat is distributed to low-temperature, medium-temperature and high-temperature preheating zones according to the temperature gradient, realizing the gradual heating of the core layer of the board and reducing the heat energy demand in the hot pressing stage. It not only solves the core pain points of large thermal inertia and waste of waste heat in traditional equipment, but also achieves multi-dimensional breakthroughs in process efficiency, product quality and environmental protection. It provides the wood-based panel industry with an upgrade solution that combines economy and technological advancement, and helps the green transformation of the manufacturing industry under the "dual carbon" target.

[0043] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

[0044] The above description is merely a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present application, based on the technical solution and concept of the present application, should be covered within the scope of protection of the present application.

Claims

1. A hot pressing device for sheet metal, characterized in that, include: At least one set of hot press plate assembly (1) is provided; The phase change heat storage tank (2) is thermally coupled to the hot press plate assembly (1) and is used to store waste heat; The plate preheating chamber (3) is located at the feed end of the hot press plate assembly (1) and is thermally connected to the phase change heat storage tank (2); The hot press plate assembly (1) comprises, in sequence: The pressure plate substrate layer (11) is made of high-strength and lightweight material and is used to support the load and transmit pressure to the surface of the plate. The microchannel plate (12) is made of a high thermal conductivity material and has a built-in dual flow channel. The heating fluid and the recovery fluid flow in different flow channels respectively. The heating fluid and the recovery fluid are used to heat the plate and capture waste heat respectively. The captured waste heat is stored in the phase change heat storage tank (2). The microchannel plate (12) is fixedly installed on the heat transfer surface of the pressure plate substrate plate (11). The heat insulation protection plate layer (13) is fixedly installed on the non-heat transfer surface of the microchannel plate layer (12); The microchannel plate (12) is provided with a hot oil channel (121) and a laying channel (122). Multiple hot oil channels (121) are opened parallel to each other along the length of the plate. The laying channel (122) is arranged adjacent to the hot oil channel (121) and parallel to each other. Multiple connecting grooves (123) are connected between the hot oil channel (121) and the laying channel (122). Each connecting groove (123) contains a movable heat exchange fin (124). The laying channel (122) contains a waste heat recovery heat exchange tube (125) that can move along the width of the laying channel (122). The movable heat exchange fin (124) is connected to the waste heat recovery heat exchange tube (125). The microchannel plate (12) is provided with a driving mechanism for adjusting the insertion depth of the movable heat exchange fin (124) in the hot oil channel (121).

2. The hot pressing device for sheet metal as described in claim 1, characterized in that, The microchannel plate (12) is also provided with a spare tube (126). The spare tube (126) is located in the laying channel (122) and is arranged side by side with the waste heat recovery heat exchange tube (125). The spare tube (126) and the waste heat recovery heat exchange tube (125) are connected to each other.

3. The hot pressing device for sheet metal as described in claim 2, characterized in that, The substrate of the microchannel plate layer (12) includes a base plate (1201) and a cover plate (1202). The movable heat exchange fins (124), the waste heat recovery heat exchange tube (125) and the spare tube (126) are integrally covered between the base plate (1201) and the cover plate (1202). The base plate (1201) and the cover plate (1202) are seamlessly connected by diffusion welding.

4. The sheet metal hot pressing device as described in claim 2, characterized in that, A heat flow main pipe (127) is also provided outside the microchannel plate (12), and a number of heat flow branch pipes (1271) are provided on the heat flow main pipe (127). Each heat flow branch pipe (1271) is used to be inserted into each hot oil channel (121). A recovery flow main pipe (128) is also provided outside the microchannel plate (12), and a number of recovery flow branch pipes (1281) are provided on the recovery flow main pipe (128). Each recovery flow branch pipe (1281) is used to be inserted into each waste heat recovery heat exchange tube (125). A spare delivery main pipe (129) is also provided outside the microchannel plate (12), and a number of spare delivery branch pipes (1291) are provided on the spare delivery main pipe (129). Each spare delivery branch pipe (1291) is used to be inserted into each spare tube (126).

5. The hot pressing device for sheet metal as described in claim 1, characterized in that, The corners of the hot oil channel (121) and the laying channel (122) are both arc-shaped. The movable heat exchange fin (124) inserted into one end of the hot oil channel (121) is also arc-shaped. The arc-shaped end of the movable heat exchange fin (124) and the side opposite to the hot oil channel (121) form an elliptical cross section.

6. The hot pressing device for sheet metal as described in claim 1, characterized in that, The movable heat exchange fin (124) is inserted into one end of the hot oil channel (121) and fixed with an edge (1241). When the movable heat exchange fin (124) is moved to the laying channel (122), the edge (1241) is used to fit against the side wall of the hot oil channel (121). The edge (1241) is used to prevent the heating fluid from entering the connecting groove (123).

7. The hot pressing device for sheet metal as described in claim 1, characterized in that, A sealing ring (4) is provided at the end of the laying channel (122) in the microchannel plate (12), a short tube (41) is provided inside the sealing ring (4), and a deformable stacked rubber sheet (42) is provided between the short tube (41) and the side wall of the sealing ring (4).

8. The hot pressing device for sheet metal as described in claim 1, characterized in that, The plate preheating chamber (3) includes: The conveyor roller conveyor has at least three temperature zones set along the material conveying direction; Finned tube heat exchangers are embedded inside the rollers of the conveyor roller conveyor. The temperature zone controller is connected to the temperature gradient controller signal of the phase change thermal storage tank (2).

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