Gypsum board forming and drying combined system based on heat recycling

Abstract

The application discloses a gypsum board forming and drying combined system based on heat recycling, which comprises a drying machine, a forming belt, a preheating pipeline, a heat exchange mechanism, a distance adjusting mechanism and a heat preservation mechanism; the distance adjusting mechanism can adjust the distance between the preheating pipeline and the forming belt; the heat preservation mechanism can cover the forming belt and the preheating pipeline and can adjust the heat preservation effect; the heat exchange mechanism can guide the high-temperature waste gas generated by the drying machine and heat the air flowing in the preheating pipeline. The preheating pipeline for heating the gypsum board and the drying machine are connected through the heat exchange mechanism to form heat transfer, so that the heat exchange mechanism can guide and utilize the high-temperature waste gas discharged from the drying machine to heat the air flowing in the preheating pipeline, thereby effectively utilizing the waste heat of the drying machine to preheat the gypsum board.

Description

Technical Field

[0001] This invention relates to the field of gypsum board production technology, and specifically to a combined system for gypsum board molding and drying based on heat recycling. Background Technology

[0002] During the gypsum board manufacturing process, wet gypsum boards need to be conveyed over a long distance on a forming belt to gradually solidify and take shape. After solidification, the gypsum boards are then conveyed to a dryer to dry them, thus obtaining dry gypsum boards.

[0003] During the production process, the solidification speed of wet gypsum board is greatly affected by ambient temperature, especially in winter when the ambient temperature is low. This results in a slower solidification speed, and the solidified gypsum board enters the dryer at a lower temperature, requiring the dryer to consume more heat energy and thus increasing drying energy consumption. Therefore, to improve the solidification speed of wet gypsum board and ensure that the solidified gypsum board enters the dryer at a suitable temperature, preheating of the wet gypsum board is necessary.

[0004] The conventional method of directly installing electric heating components above the forming belt is costly and energy-intensive. Furthermore, the dryer requires natural gas combustion to generate heat for drying the formed gypsum board inside. This combustion produces high-temperature exhaust gas, which is directly discharged into exhaust gas treatment equipment, resulting in wasted heat energy.

[0005] Therefore, conventional methods of preheating gypsum boards are less efficient because they cannot utilize the high-temperature exhaust gas generated by the dryer, resulting in higher energy consumption for preheating. Summary of the Invention

[0006] The purpose of this invention is to provide a combined system for gypsum board molding and drying based on heat recycling, so as to solve the technical problem that it is difficult to utilize the high-temperature exhaust gas generated by the dryer in the prior art, which leads to higher energy consumption required for preheating gypsum board.

[0007] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: A combined system for gypsum board molding and drying based on heat recycling, comprising: Dryer, used to dry molded gypsum boards that have entered its interior; A forming belt, connected to the dryer, is used to transport the solidified gypsum board into the dryer for drying; A preheating pipeline is laid above the forming belt, and the heat source flowing inside it dissipates heat to the outside to preheat the gypsum board on the forming belt. The heat exchange mechanism is connected to the exhaust port of the dryer, guides the high-temperature exhaust gas discharged from the dryer to exchange heat with the outside air before discharge, and inputs the hot air generated after heat exchange into the preheating pipeline. The spacing adjustment mechanism includes a fixing part and an adjusting part. The fixing part of the spacing adjustment mechanism is disposed on the frame of the forming belt or on the bottom surface near the forming belt, and the preheating pipeline is disposed on the adjusting part of the spacing adjustment mechanism. The heat preservation mechanism, in a semi-enclosed structure, is installed on the preheating pipeline and covers the molding belt and the preheating pipeline to form a semi-enclosed cavity to isolate the influence of external ambient temperature on the interior. The heat preservation mechanism can change the shielding area to control the flow area between the semi-enclosed cavity and the outside.

[0008] As a preferred embodiment of the present invention, the heat exchange mechanism includes a gas guide pipe, a heat exchanger, a return gas pipe, and an exhaust box; The heat exchanger is installed inside the exhaust box, and the air guide pipe and the air return pipe are installed on the exhaust box and connected to the air inlet and exhaust end of the heat exchanger, respectively. The other end of the gas guide pipe and the gas return pipe are connected to the exhaust pipe of the dryer to guide the exhaust gas generated by the dryer into the heat exchanger for use, and return the exhaust gas after heat exchange to the exhaust pipe of the dryer.

[0009] In a preferred embodiment of the present invention, a gas distribution pipe and an exhaust pipe are sequentially connected to the exhaust port of the dryer, and the gas distribution pipe and the exhaust pipe constitute the exhaust pipeline of the dryer. The air guide pipe and the air return pipe are respectively connected to the air distribution pipe.

[0010] In a preferred embodiment of the present invention, a gas distribution branch pipe and a return gas branch pipe are respectively provided on the side wall of the gas distribution pipe, the gas guide pipe is connected to the gas distribution branch pipe, and the return gas pipe is connected to the return gas branch pipe. The gas distribution branch pipe and the return gas branch pipe are located on both sides of the gas distribution pipe, respectively.

[0011] In a preferred embodiment of the present invention, both the gas distribution branch pipe and the return gas branch pipe are inclinedly disposed on the side wall of the gas distribution pipe, and the outer end of the gas distribution branch pipe is inclined toward the direction in which the exhaust gas flows in the gas distribution pipe, while the outer end of the return gas branch pipe is inclined toward the opposite direction in which the exhaust gas flows in the gas distribution pipe.

[0012] In a preferred embodiment of the present invention, the connection between the gas distribution branch pipe and the gas distribution pipe is close to the dryer, while the connection between the return gas branch pipe and the gas distribution pipe is close to the exhaust gas pipe. The gas distribution pipe forms a double-bend structure between the gas distribution branch pipe and the return gas branch pipe to increase the resistance at the connection between the gas distribution branch pipe and the gas distribution pipe.

[0013] As a preferred embodiment of the present invention, the exhaust box includes an air inlet formed at its bottom and an exhaust outlet formed at its top, and the air inlet end of the preheating pipe is connected to the exhaust outlet. A blower is installed on the inner wall of the air inlet, and the exhaust end of the preheating pipe is connected to the air inlet.

[0014] As a preferred embodiment of the present invention, the preheating pipeline includes at least one heat-releasing pipe laid flat in an S-shape above the forming belt, the bottom of the heat-releasing pipe is flat, and the bottom of the heat-releasing pipe is provided with multiple heat-releasing fins, and the heat-releasing pipe is covered with multiple heat-insulating covers. The heat-releasing pipe is connected to the exhaust port via a heat transfer pipe.

[0015] As a preferred embodiment of the present invention, the spacing adjustment mechanism includes a support frame disposed at the bottom of the forming belt, and a plurality of electric cylinders are symmetrically disposed on the outer wall of the support frame, and a suspension frame is jointly mounted on the cylinder rods of the plurality of electric cylinders. The suspension frame is located above the forming belt, and the heat dissipation pipe is suspended at the bottom of the suspension frame.

[0016] As a preferred embodiment of the present invention, the heat preservation mechanism includes a semi-enclosed arch frame, a cover plate is slidably disposed on the top frame of the arch frame, and a side plate is slidably disposed on the side frame of the arch frame. Both the cover plate and the side plate are modular structures, and each module of the cover plate and the side plate can slide independently.

[0017] Compared with the prior art, the present invention has the following advantages: This invention connects the preheating pipeline used for heating gypsum board to the dryer through a heat exchange mechanism, thereby enabling the heat exchange mechanism to guide and utilize the high-temperature exhaust gas discharged from the dryer to heat the air flowing in the preheating pipeline, thus effectively utilizing the waste heat of the dryer's exhaust gas to preheat the gypsum board. Attached Figure Description

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in 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 merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0019] Figure 1 A schematic diagram of the combined system for gypsum board molding and drying based on heat recycling provided in an embodiment of the present invention; Figure 2 A schematic diagram of the gas distribution pipe section of the gypsum board molding and drying combined system based on heat recycling provided in an embodiment of the present invention. Figure 3 A schematic diagram of the heat exchange mechanism of the gypsum board molding and drying combined system based on heat recycling provided in an embodiment of the present invention. Figure 4 A schematic diagram of the heat release pipe section of the gypsum board molding and drying combined system based on heat recycling provided in an embodiment of the present invention. Figure 5 A schematic diagram of the spacing adjustment mechanism of the gypsum board molding and drying combined system based on heat recycling provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the insulation mechanism of the gypsum board molding and drying combined system based on heat recycling provided in an embodiment of the present invention.

[0020] The labels in the diagram represent the following: 1-Dryer; 2-Forming belt; 3-Preheating pipeline; 4-Heat exchange mechanism; 5-Gap adjustment mechanism; 6-Insulation mechanism; 11-Gas distribution pipe; 12-Exhaust gas pipe; 31-Heat release pipe; 32-Heat release fins; 33-Insulation cover; 41-Gas duct; 42-Heat exchanger; 43-Return gas pipe; 44-Exhaust box; 51-Support frame; 52-Electric cylinder; 53-Suspension frame; 61-Arch frame; 62-Cover plate; 63-Side plate; 111-Gas branch pipe; 112-Gas return branch pipe; 113-Double-bend structure; 441-Air inlet; 442-Exhaust outlet; 443-Blower. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figure 1 As shown, the present invention provides a combined system for gypsum board molding and drying based on heat recycling, comprising: Dryer 1 is used to dry the molded gypsum board that enters it; The forming belt 2 is connected to the dryer 1 and is used to transport the solidified gypsum board into the dryer 1 for drying. The preheating pipe 3 is laid above the forming belt 2. The heat source flowing inside it dissipates heat to the outside to preheat the gypsum board on the forming belt 2. The heat exchange mechanism 4 is connected to the exhaust port of the dryer 1, guides the high-temperature exhaust gas discharged from the dryer 1 to exchange heat with the outside air before exhausting, and inputs the hot air generated after heat exchange into the preheating pipeline 3. The spacing adjustment mechanism 5 includes a fixing part and an adjusting part. The fixing part of the spacing adjustment mechanism 5 is set on the frame of the forming belt 2 or on the bottom surface near the forming belt 2, and the preheating pipe 3 is set on the adjusting part of the spacing adjustment mechanism 5. The insulation mechanism 6 has a semi-enclosed structure and is set on the preheating pipe 3. It covers the forming belt 2 and the preheating pipe 3 to form a semi-enclosed cavity to isolate the influence of the external ambient temperature on the interior. Among them, the heat preservation mechanism 6 can change the shielding area to control the flow area between the semi-enclosed cavity and the outside.

[0023] The combined system in this embodiment mainly involves the heat exchange mechanism 4 exchanging heat between the exhaust gas generated by the dryer 1 and the air, thereby heating the air entering the heat exchange mechanism 4 and delivering the heated air to the preheating pipeline 3. The preheating pipeline 3 is arranged above the forming belt 2, so the preheating pipeline 3 can release heat to heat the wet gypsum board conveyed on the forming belt 2, thereby increasing the solidification and forming speed of the wet gypsum board and ensuring that the temperature of the formed gypsum board is within the standard range before entering the dryer.

[0024] Furthermore, the spacing adjustment mechanism 5 can use a temperature sensor to detect the surface temperature of the gypsum board and adjust the height of the preheating pipe 3 according to the temperature detection value. This allows for increasing the spacing between the preheating pipe 3 and the gypsum board when the ambient temperature is high, or decreasing the spacing between the preheating pipe 3 and the gypsum board when the ambient temperature is low, in order to adjust the heating effect and avoid both insufficient heating and overheating.

[0025] Furthermore, the insulation mechanism 6 can cover the forming belt 2 and the preheating pipe 3 through its semi-enclosed structure, thereby reducing the interference of the external ambient temperature on the heating area. The insulation mechanism 6 can also adjust the area of ​​the cover, thereby reducing the cover area to dissipate heat when the ambient temperature is high, or increasing the cover area to keep warm when the ambient temperature is high.

[0026] Compared to existing electric heating preheating methods, the combined system of this embodiment can guide the high-temperature exhaust gas generated by the dryer 1 and heat the air, so that the heated air enters the preheating pipe 3 arranged above the forming belt 2 to release heat, thereby achieving preheating of the wet gypsum board, which is more energy-saving and environmentally friendly.

[0027] The heat exchange mechanism 4 is used to guide and heat the air. A preferred embodiment is provided below.

[0028] like Figure 1 As shown, the heat exchange mechanism 4 includes a gas guide pipe 41, a heat exchanger 42, a return gas pipe 43, and an exhaust box 44; The heat exchanger 42 is installed inside the exhaust box 44. The air guide pipe 41 and the return pipe 43 are installed on the exhaust box 44 and connected to the air inlet and exhaust end of the heat exchanger 42, respectively. The other ends of the gas guide pipe 41 and the return gas pipe 43 are connected to the exhaust pipe of the dryer 1 to guide the exhaust gas generated by the dryer 1 into the heat exchanger 42 for use, and return the exhaust gas after heat exchange to the exhaust pipe of the dryer 1.

[0029] Specifically, the air guide pipe 41 is used to guide the high-temperature exhaust gas generated by the dryer 1 into the heat exchanger 42, and return the heat-exchanged exhaust gas to the exhaust pipe of the dryer 1 through the return pipe 43.

[0030] The heat exchanger 42 is heated in the exhaust box 44, so the air entering the exhaust box 44 is heated and then sent into the preheating pipe 3 by the exhaust box 44.

[0031] When utilizing exhaust gas, both the gas guide pipe 41 and the return pipe 43 need to be connected to the exhaust pipe of the dryer 1, so that the exhaust gas can enter the heat exchanger 42 from the gas guide pipe 41 and return to the exhaust pipe of the dryer 1 from the return pipe 43.

[0032] Therefore, as Figure 1 As shown, a gas distribution pipe 11 and an exhaust pipe 12 are connected sequentially to the exhaust port of the dryer 1. The gas distribution pipe 11 and the exhaust pipe 12 constitute the exhaust pipeline of the dryer 1. Among them, the air guide pipe 41 and the air return pipe 43 are respectively connected to the air distribution pipe 11.

[0033] Specifically, the exhaust pipe of the dryer 1 consists of a gas distribution pipe 11 and an exhaust pipe 12. The exhaust pipe 12 is used to connect the exhaust gas treatment equipment. The gas guide pipe 41 and the return pipe 43 are installed on the gas distribution pipe 11, so that the high-temperature exhaust gas can be discharged from the gas distribution pipe 11 and the used exhaust gas can be discharged into the gas distribution pipe 11 from the return pipe 13. This will not affect the air environment between plants, but will also reduce the exhaust gas emission temperature and reduce the treatment difficulty of the exhaust gas treatment equipment.

[0034] Since the exhaust gas needs to flow through the gas guide pipe 41, heat exchanger 42 and return pipe 43, and there will be some impurities in the exhaust gas, these components need to be maintained regularly. Therefore, the connection between the gas guide pipe 41 and return pipe 43 and the gas distribution pipe 11 needs to be easy to disassemble and assemble.

[0035] like Figure 1 and Figure 2As shown, a gas distribution branch pipe 111 and a return gas branch pipe 112 are respectively provided on the side wall of the gas distribution pipe 11. The gas guide pipe 41 is connected to the gas distribution branch pipe 111, and the return gas pipe 43 is connected to the return gas branch pipe 112. Among them, the gas distribution branch pipe 111 and the return gas branch pipe 112 are located on both sides of the gas distribution pipe 11.

[0036] Specifically, the gas distribution branch pipe 111 and the return gas branch pipe 112 are welded to the gas distribution pipe 11, while the gas guide pipe 41 and the return gas pipe 43 are respectively sealed and plugged into the gas distribution branch pipe 111 and the return gas branch pipe 112 for easy and quick disassembly and maintenance.

[0037] Furthermore, the gas distribution branch pipe 111 and the return gas branch pipe 112 are located on both sides of the gas distribution pipe 11, thereby avoiding mutual interference between the gas distribution branch pipe 111 exhausting outward and the return gas branch pipe 112 exhausting inward.

[0038] When the exhaust gas is discharged from the dryer 1, there is a certain flow velocity. If the gas distribution branch pipe 111 and the return gas branch pipe 112 are welded vertically to the gas distribution pipe, the exhaust gas will have difficulty entering the gas guide pipe 41 (the reason is that the pipeline of gas guide pipe 41, heat exchanger 42 and return gas pipe 43 is too long, and the flow resistance is large, especially in heat exchanger 42).

[0039] Therefore, as Figure 1 and Figure 2 As shown, both the gas distribution branch pipe 111 and the return gas branch pipe 112 are inclined on the side wall of the gas distribution pipe 11, and the outer end of the gas distribution branch pipe 111 is inclined in the direction of the exhaust gas flow in the gas distribution pipe 11, while the outer end of the return gas branch pipe 112 is inclined in the opposite direction of the exhaust gas flow in the gas distribution pipe 11.

[0040] The gas distribution branch pipe 111 and the return gas branch pipe 112 are designed with an inclination, so that the connection port of the gas distribution branch pipe 111 to the gas distribution pipe 11 faces the dryer 1, while the connection port of the return gas branch pipe 112 to the gas distribution pipe 11 faces the exhaust gas pipe 12.

[0041] When the exhaust gas flows in the gas distribution pipe 11, it is easier to enter the gas distribution branch pipe 111 and generate negative pressure in the return gas branch pipe 112. That is, a large pressure difference will be generated between the gas distribution branch pipe 111 and the return gas branch pipe 112, so that the exhaust gas actively overcomes the resistance and flows along the gas guide pipe 41, heat exchanger 42 and return gas pipe 43, thereby improving the heat exchange effect of the heat exchange mechanism 4.

[0042] Furthermore, in order to further increase the flow velocity of exhaust gas along the duct 41, heat exchanger 42 and return pipe 43, the following preferred embodiments are provided.

[0043] like Figure 1 and Figure 2As shown, the connection between the gas distribution branch pipe 111 and the gas distribution pipe 11 is close to the dryer 1, while the connection between the return gas branch pipe 112 and the gas distribution pipe 11 is close to the exhaust gas pipe 12. The gas distribution pipe 11 forms a double-bend structure 113 between the gas distribution branch pipe 111 and the return gas branch pipe 112 to increase the resistance at the connection between the gas distribution branch pipe 111 and the gas distribution pipe 11.

[0044] Specifically, the gas distribution branch pipe 111 and the return gas branch pipe 112 are separated by a certain distance, and the gas distribution pipe 11 bends between the gas distribution branch pipe 111 and the return gas branch pipe 112 to form a double-bend structure 113, which further reduces the resistance of the exhaust gas entering the gas distribution branch pipe 111, thereby further increasing the pressure difference between the gas distribution branch pipe 111 and the return gas branch pipe 112, so as to further increase the flow velocity of the exhaust gas along the guide pipe 41, the heat exchanger 42 and the return gas pipe 43.

[0045] The exhaust gas flows inside the heat exchanger 42 and heats the heat exchanger 42. The heat exchanger 42 can then heat the air outside it, that is, heat the air inside the exhaust box 44. The exhaust box 44 needs to discharge the heated air into the preheating pipe 3.

[0046] Therefore, as Figure 1 and Figure 3 As shown, the exhaust box 44 includes an air inlet 441 formed at its bottom and an exhaust outlet 442 formed at its top, and the air inlet end of the preheating pipe 3 is connected to the exhaust outlet 442. A blower 443 is installed on the inner wall of the air inlet 441, and the exhaust end of the preheating pipe 3 is connected to the air inlet 441.

[0047] Specifically, the blower 443 blows outside air into the interior of the exhaust box 44 through the air inlet 441. The air entering the exhaust box 44 is heated by the heat exchanger 42, and the heated air is discharged into the preheating pipe 3 through the exhaust port 442.

[0048] Furthermore, the air outlet of the preheating pipe 3 is connected to the air inlet of the exhaust box 44 to achieve airflow circulation within the preheating pipe 3, thereby reducing heat loss and reducing heat exchange energy consumption.

[0049] The preheating pipe 3 is installed above the forming belt 2, and its specific structure and layout are as follows: like Figure 1 and Figure 4 As shown, the preheating pipeline 3 includes at least one heat-dissipating pipeline 31 laid flat in an S-shape above the forming belt 2. The bottom of the heat-dissipating pipeline 31 is flat, and the bottom of the heat-dissipating pipeline 31 is provided with multiple heat-dissipating fins 32, and the heat-dissipating pipeline 31 is covered with multiple heat-insulating covers 33. The heat dissipation pipe 31 and the exhaust port 442 are connected by a heat transfer pipe.

[0050] Specifically, the heat dissipation pipe 31 is designed in an S-shape, which can cover the white surface of the gypsum board more comprehensively, and the heat dissipation pipe 31 can be a single pipe or multiple intermittent pipes.

[0051] The bottom of the heat dissipation pipe 31 adopts a flat design, which can reduce the distance between the heating surface and the gypsum board surface, and further increase the heat exchange area by adding heat dissipation fins 32, thereby increasing the heating speed.

[0052] The heat insulation cover 33 is installed on the upper part of the heat dissipation pipe 31, thereby reducing the upward dissipation of heat and concentrating the downward heating to improve the heating effect of the preheating pipe 3.

[0053] The spacing adjustment mechanism 5 can change the distance between the preheating pipe 3 and the gypsum board to change the heating temperature of the gypsum board by the preheating pipe 3. A preferred embodiment is provided below.

[0054] like Figure 1 and Figure 5 As shown, the spacing adjustment mechanism 5 includes a support frame 51 set at the bottom of the forming belt 2. Multiple electric cylinders 52 are symmetrically arranged on the outer wall of the support frame 51, and a suspension frame 53 is installed on the cylinder rod of the multiple electric cylinders 52. The suspension frame 53 is located above the forming belt 2, and the heat dissipation pipe 31 is suspended at the bottom of the suspension frame 53.

[0055] Specifically, the controller can control the electric cylinder 52 to work based on the temperature of the gypsum board surface detected by the temperature sensor. When the temperature is too high, the electric cylinder 52 pushes the suspension bracket 53 upward, thereby increasing the distance between the heat dissipation pipe 31 and the gypsum board to reduce the heating temperature. When the temperature is too low, the electric cylinder 52 pulls the suspension bracket 53 downward, thereby decreasing the distance between the heat dissipation pipe 31 and the gypsum board to increase the heating temperature.

[0056] In order to reduce the impact of the external ambient temperature on the heating effect of the heat dissipation pipe 31 when adjusting the heating temperature, the following preferred embodiments are provided.

[0057] like Figure 1 and Figure 6 As shown, the insulation mechanism 6 includes a semi-enclosed arch frame 61, a cover plate 62 is slidably disposed on the top frame of the arch frame 61, and a side plate 63 is slidably disposed on the side frame of the arch frame 61. Both the cover plate 62 and the side plate 63 are modular structures, and each module of the cover plate 62 and the side plate 63 can slide independently.

[0058] Specifically, the cover plate 62 and the side plate 63 form a semi-enclosed structure on the arch frame 61 to reduce the interference of the external environment on the interior.

[0059] Furthermore, both the cover plate 62 and the side plate 63 are modular structures that can be independently controlled to move, thereby adjusting the flow area between the semi-enclosed structure and the outside according to the external ambient temperature, thus adjusting the insulation effect, reducing the insulation effect in high temperatures in summer, or improving the insulation effect in low temperatures in winter.

[0060] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A combined system for gypsum board molding and drying based on heat recycling, characterized in that, include: Dryer (1) for drying molded gypsum boards that have entered its interior; A forming belt (2) is connected to the dryer (1) for conveying the solidified gypsum board into the dryer (1) for drying; The preheating pipe (3) is laid above the forming belt (2), and the heat source flowing inside it dissipates heat to preheat the gypsum board on the forming belt (2). The heat exchange mechanism (4) is connected to the exhaust port of the dryer (1), guides the high-temperature exhaust gas discharged from the dryer (1) to exchange heat with the outside air and then discharges the exhaust gas, and inputs the hot air generated after heat exchange into the preheating pipeline (3); The spacing adjustment mechanism (5) includes a fixing part and an adjustment part. The fixing part of the spacing adjustment mechanism (5) is provided on the frame of the forming belt (2) or on the bottom surface near the forming belt (2). The preheating pipe (3) is provided on the adjustment part of the spacing adjustment mechanism (5). The heat preservation mechanism (6) has a semi-enclosed structure and is set on the preheating pipeline (3), and covers the molding belt (2) and the preheating pipeline (3) to form a semi-enclosed cavity to isolate the influence of the external ambient temperature on the interior; The heat preservation mechanism (6) can change the shielding area to control the flow area between the semi-enclosed cavity and the outside. The heat exchange mechanism (4) includes a gas guide pipe (41), a heat exchanger (42), a return gas pipe (43), and an exhaust box (44). The heat exchanger (42) is installed inside the exhaust box (44), and the air guide pipe (41) and the air return pipe (43) are installed on the exhaust box (44) and connected to the air inlet and exhaust end of the heat exchanger (42) respectively. The other end of the gas guide pipe (41) and the return gas pipe (43) are connected to the exhaust pipe of the dryer (1) so as to guide the exhaust gas generated by the dryer (1) into the heat exchanger (42) for use, and return the exhaust gas after heat exchange to the exhaust pipe of the dryer (1). The dryer (1) is connected in sequence to a gas distribution pipe (11) and an exhaust pipe (12) at its exhaust port. The gas distribution pipe (11) and the exhaust pipe (12) constitute the exhaust pipeline of the dryer (1). The air guide pipe (41) and the air return pipe (43) are respectively connected to the air distribution pipe (11); A gas distribution branch pipe (111) and a return gas branch pipe (112) are respectively provided on the side wall of the gas distribution pipe (11). The gas guide pipe (41) is connected to the gas distribution branch pipe (111), and the return gas pipe (43) is connected to the return gas branch pipe (112). The gas distribution branch pipe (111) and the return gas branch pipe (112) are located on both sides of the gas distribution pipe (11); Both the gas distribution branch pipe (111) and the return gas branch pipe (112) are inclined on the side wall of the gas distribution pipe (11), and the outer end of the gas distribution branch pipe (111) is inclined in the direction of the flow of waste gas in the gas distribution pipe (11), while the outer end of the return gas branch pipe (112) is inclined in the opposite direction of the flow of waste gas in the gas distribution pipe (11). The connection between the gas distribution branch pipe (111) and the gas distribution pipe (11) is close to the dryer (1), while the connection between the return gas branch pipe (112) and the gas distribution pipe (11) is close to the exhaust gas pipe (12). The gas distribution pipe (11) forms a double-bend structure (113) between the gas distribution branch pipe (111) and the return gas branch pipe (112) to increase the resistance at the connection between the gas distribution branch pipe (111) and the gas distribution pipe (11).

2. The gypsum board molding and drying combined system based on heat recycling according to claim 1, characterized in that, The exhaust box (44) includes an air inlet (441) formed at its bottom and an exhaust outlet (442) formed at its top, and the air inlet end of the preheating pipe (3) is connected to the exhaust outlet (442). A blower (443) is provided on the inner wall of the air inlet (441), and the exhaust end of the preheating pipe (3) is connected to the air inlet (441).

3. The gypsum board molding and drying combined system based on heat recycling according to claim 2, characterized in that, The preheating pipeline (3) includes at least one heat-releasing pipe (31) laid out in an S-shape above the forming belt (2). The bottom of the heat-releasing pipe (31) is flat, and the bottom of the heat-releasing pipe (31) is provided with multiple heat-releasing fins (32), and the heat-releasing pipe (31) is covered with multiple heat-insulating covers (33). The heat-releasing pipe (31) and the exhaust port (442) are connected by a heat transfer pipe.

4. The gypsum board molding and drying combined system based on heat recycling according to claim 3, characterized in that, The spacing adjustment mechanism (5) includes a support frame (51) disposed at the bottom of the forming belt (2). Multiple electric cylinders (52) are symmetrically disposed on the outer wall of the support frame (51), and a suspension frame (53) is mounted on the cylinder rod of the multiple electric cylinders (52). The suspension frame (53) is located above the forming belt (2), and the heat dissipation pipe (31) is suspended from the bottom of the suspension frame (53).

5. The gypsum board molding and drying combined system based on heat recycling according to claim 1, characterized in that, The insulation mechanism (6) includes a semi-enclosed arch frame (61), a cover plate (62) is slidably provided on the top frame of the arch frame (61), and a side plate (63) is slidably provided on the side frame of the arch frame (61). Both the cover plate (62) and the side plate (63) are modular structures, and each module of the cover plate (62) and the side plate (63) can slide independently.

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