Veneer drying device for plate processing

Abstract

The utility model discloses a veneer drying device for plate processing, and belongs to the technical field of plate processing. The veneer drying device mainly comprises a rack, a drying box is fixedly connected to the upper end of the rack, a preheating box is fixedly connected to the side, close to the veneer feeding end, of the drying box, a heat preservation box is fixedly connected to the other side of the drying box, a heat exchange cavity is formed in the bottom of the drying box, and the two ends in the heat exchange cavity are in transmission connection with metal net belts used for veneer conveying. The rack is fixedly connected with a plurality of sets of pressing plate guiding mechanisms used for veneer extrusion guiding, a waste heat primary heat exchanger corresponding to the preheating box is fixedly connected into the heat exchange cavity, and the top of the drying box communicates with the waste heat primary heat exchanger through a first pipeline fan. The metal net belt is adopted for conveying, the veneers are evenly heated in all directions, the pressing plate guiding mechanism ensures that the veneers are conveyed flatly, the edges of the veneers are effectively prevented from warping and deforming, and the consistency and stability of drying quality are guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of sheet metal processing technology, and more specifically, it relates to a veneer drying device for sheet metal processing. Background Technology

[0002] In plywood processing, timber is first sawn into veneers and dried to control moisture content. Then, the veneers are coated with glue, assembled according to their grain, and hot-pressed to cure the glue and bond the veneers together, forming plywood. Finally, the surface is sanded to make it smooth, and further processing such as cutting, edge banding, and drilling is performed as needed. Currently, veneer moisture content is mainly reduced by air drying. However, the moisture content of dried veneer is unstable, resulting in some veneers still having a high moisture content. This dilutes the glue, reduces bonding strength, and makes the plywood prone to delamination. Furthermore, the resulting plywood is susceptible to deformation, warping, and cracking due to changes in veneer moisture content.

[0003] Patent No. CN220818425U discloses a vertical reciprocating veneer dryer. The height of the hydraulic rod can be controlled by the control buttons on the control panel, thus accommodating workers of different heights. The sliding movement of the slide rail and pulley effectively reduces transportation resistance, alleviates the workload of workers, and improves work efficiency. The heating fan can be adjusted by the control buttons on the control panel, thereby adjusting the wind speed of the air duct and adjusting the drying temperature of the veneers on the drying rack to prevent cracking caused by excessive drying temperature and reduce the defect rate of veneer drying.

[0004] Although the above patent solves the problem of veneer drying, the following problems still exist in its use: 1. The dryer uses multiple heating fans for drying, which consumes a lot of energy, and the hot air after drying contains a lot of heat energy, which is directly discharged, resulting in serious energy waste; 2. During veneer drying, the edges are prone to warping. The above dryer has a relatively simple function and lacks a pressure plate guiding mechanism, which cannot meet the diverse production needs. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a veneer drying device for board processing. It uses a metal mesh belt for conveying and, together with the preheating and heat preservation function of the heat exchange chamber, enables the veneer to be heated evenly in all directions. The pressure plate guiding mechanism ensures that the veneer is conveyed flat, promotes uniform evaporation of moisture, effectively prevents the edge warping and deformation of the veneer, and ensures the consistency and stability of the drying quality.

[0006] The aforementioned veneer drying device for sheet processing includes a frame, a drying chamber fixedly connected to the upper end of the frame, a preheating chamber fixedly connected to one side of the drying chamber near the board inlet, and an insulation chamber fixedly connected to the other side of the drying chamber. A heat exchange chamber is provided at the bottom of the drying chamber, with drive shafts rotatably connected to both ends of the heat exchange chamber. The two drive shafts jointly drive a metal mesh belt for conveying veneers. Multiple sets of pressure plate guiding mechanisms for veneer extrusion are fixedly connected to the frame. Oppositely arranged electric heaters are fixedly connected to the heat exchange chamber and the drying chamber. A primary waste heat exchanger corresponding to the preheating chamber is fixedly connected to the heat exchange chamber. The top of the drying chamber is connected to the primary waste heat exchanger via a pipe fan.

[0007] Preferably, the waste heat primary heat exchanger includes a support frame, with multiple heat exchange pipes passing through and fixedly connected to both ends of the support frame. One end of the support frame is sealed and fixedly connected to an inlet chamber, a first transfer chamber, and an outlet chamber, while the other end of the support frame is sealed and fixedly connected to a second transfer chamber and a third transfer chamber. The inlet chamber, the first transfer chamber, the outlet chamber, the second transfer chamber, and the third transfer chamber are respectively connected to corresponding heat exchange pipes. An inlet pipe is connected to the inlet chamber, and the inlet pipe is connected to a pipe fan. An outlet pipe is connected to the outlet chamber.

[0008] Preferably, a secondary waste heat exchanger is fixedly connected to the side of the drying box. The secondary waste heat exchanger has waste heat recovery channels and air heat exchange channels arranged alternately. The steam outlet pipe of the primary waste heat exchanger is connected to the waste heat recovery channel through a pipe fan, and the air heat exchange channel is connected to the heat exchange chamber.

[0009] Preferably, the waste heat secondary heat exchanger includes a heat exchanger shell, and multiple partitions arranged in parallel and at equal intervals are provided inside the heat exchanger shell. The partitions are sealed and fixedly connected to the heat exchanger shell to form heat exchange chambers. The odd-numbered heat exchange chambers are connected in series through a steam connecting pipe to form a waste heat recovery channel, and the even-numbered heat exchange chambers are connected in series through an air connecting pipe to form an air heat exchange channel. A second steam inlet pipe is provided on one side of the heat exchanger shell, and a second steam outlet pipe is provided at the top of the heat exchanger shell. The second steam inlet pipe and the second steam outlet pipe are respectively connected to the two ends of the waste heat recovery channel. The second steam inlet pipe is connected to a second pipe fan. A cold air inlet connected to the air heat exchange channel is provided on the other side of the heat exchanger shell. A blower is provided at the cold air inlet. An air outlet is provided at the other end of the air heat exchange channel and is connected to the heat exchange chamber.

[0010] Preferably, both the second steam inlet pipe and the second steam outlet pipe are equipped with filter screens.

[0011] Preferably, the pressure plate guiding mechanism includes an upper pressure plate roller and a lower pressure plate roller arranged vertically. The lower pressure plate roller is located below the mesh belt of the metal mesh belt and contacts the lower end face of the mesh belt. Fixed bearing seats are rotatably connected to both ends of the lower pressure plate roller, and the fixed bearing seats are fixedly connected to the frame. The upper pressure plate roller is located above the mesh belt of the metal mesh belt, and automatic pressing mechanisms are provided at both ends of the upper pressure plate roller.

[0012] Preferably, the automatic pressing mechanism includes a fixed base, which is fixedly connected to the frame. A movable bearing seat is slidably connected inside the fixed base. The movable bearing seat is rotatably connected to the upper pressure plate roller. A screw is movably connected to the upper end of the movable bearing seat and the fixed base. A spring is sleeved inside the screw, and the two ends of the spring abut against the fixed base and the movable bearing seat, respectively.

[0013] Preferably, a drive motor is fixedly connected to the frame, the drive motor drives the metal mesh belt, the inlet end of the metal mesh belt is provided with a support plate, and the outlet end of the metal mesh belt is provided with an outlet guide plate, the support plate and the outlet guide plate are respectively fixedly connected to the frame.

[0014] Preferably, the frame is provided with support legs at the four corners of its bottom.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model is equipped with a preheating box, a drying box, and an insulation box. The preheating box works in conjunction with a waste heat primary heat exchanger to achieve preliminary heat recovery and utilization. The insulation box allows the dried veneer to cool down slowly, avoiding deformation or cracking of the veneer due to a sudden drop in temperature.

[0017] 2. By constructing a dual waste heat recovery system through a primary waste heat exchanger and a secondary waste heat exchanger, the heat generated during the drying process is recovered and utilized multiple times. The waste heat is used to preheat the air in the preheating box and heat exchange chamber, reducing the energy consumption of the electric heater, effectively saving energy, and reducing the company's production costs.

[0018] 3. A metal mesh belt is used for conveying. The mesh structure of the metal mesh belt facilitates the penetration of hot air. Combined with the preheating and heat preservation function of the heat exchange chamber, the veneer is heated evenly from all directions. At the same time, a pressure plate guiding mechanism is added. The pressure plate guiding mechanism works continuously in all stages before, during and after the veneer drying process. The automatic pressing mechanism can adaptively adjust the pressure according to the thickness of the veneer to ensure that the veneer is conveyed flat, promotes uniform evaporation of moisture, effectively prevents the edge warping and deformation of the veneer, and ensures the consistency and stability of the drying quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the inlet end of this utility model;

[0020] Figure 2This is a schematic diagram of the structure of the plate-out end of this utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the heat exchange cavity;

[0022] Figure 4 This is a schematic diagram of the pressure plate guide mechanism;

[0023] Figure 5 A schematic diagram of the internal structure of a primary heat exchanger for waste heat.

[0024] Figure 6 This is a schematic diagram of a waste heat secondary heat exchanger.

[0025] Figure 7 This is a schematic diagram of the internal structure of a waste heat secondary heat exchanger.

[0026] Figure 8 This is a schematic diagram showing the connection between the partition and the steam connecting pipe and the air connecting pipe;

[0027] Figure 9 This is a reference diagram showing the usage state of this utility model.

[0028] In the diagram, 1. Heat exchange chamber; 2. Support leg; 3. Drive motor; 4. Metal mesh belt; 401. Support plate; 402. Plate outlet guide plate; 5. Pressure plate guide mechanism; 501. Upper pressure plate roller; 502. Lower pressure plate roller; 503. Fixed bearing seat; 504. Fixed seat; 505. Movable bearing seat; 506. Spring; 507. Screw; 6. Preheating box; 7. Drying box; 8. Pipe fan one; 9. Insulation box; 10. Pipe fan two; 11. Waste heat secondary heat exchanger; 1101. Steam inlet pipe two; 110 2. Air outlet; 1103. Cold air inlet; 1104. Steam outlet pipe 2; 1105. Baffle plate; 1106. Steam connecting pipe; 1107. Air connecting pipe; 12. Blower; 13. Waste heat primary heat exchanger; 1301. Steam inlet pipe 1; 1302. Steam outlet pipe 1; 1303. Steam inlet chamber; 1304. Transfer chamber 1; 1305. Steam outlet chamber; 1306. Heat exchange pipe; 1307. Transfer chamber 2; 1308. Transfer chamber 3; 1309. Support frame; 14. Electric heater; 15. Single panel. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings:

[0030] The directional terms used in the detailed description paragraphs are only for the convenience of those skilled in the art to understand the technical solutions described in this application based on the visual orientation shown in the accompanying drawings. Unless otherwise expressly specified and limited, the terms "setting," "installation," "connection," etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] like Figures 1 to 9 As shown, a veneer drying device for sheet processing includes a frame with support legs 2 at each of the four corners of the frame's bottom. The support legs 2 employ an adjustable foot cup structure, which not only increases the contact area with the ground, improving the stability of the drying device, but also effectively disperses vibrations generated during operation. A drying chamber 7 is fixedly connected to the upper end of the frame. The outer shell of the drying chamber 7 is made of double-layer high-temperature resistant stainless steel plates, filled with high-efficiency heat-insulating material, effectively reducing heat loss and lowering energy consumption. A preheating chamber 6 is fixedly connected to one side of the drying chamber 7 near the board inlet, and an insulation chamber 9 is fixedly connected to the other side of the drying chamber 7. The insulation chamber 9 has multiple layers of insulation cotton inside, providing significant insulation and allowing the dried veneer to cool down slowly, preventing deformation or cracking due to sudden temperature drops.

[0032] The bottom of the drying oven 7 is equipped with a heat exchange chamber 1. Both ends of the heat exchange chamber 1 are rotatably connected to a drive shaft. The two drive shafts are connected to a metal mesh belt 4 for conveying the veneer. The metal mesh belt 4 adopts a mesh structure, which not only ensures the strength of the mesh belt, but also facilitates the penetration and circulation of hot air, making it easy to dry the veneer from all directions and accelerating the drying speed of the veneer. Secondly, placing the metal mesh belt 4 in the heat exchange chamber 1 can preheat and keep the metal mesh belt 4 warm, so that the veneer is preheated during the contact process with the metal mesh belt 4, which helps the moisture in the veneer to be better discharged.

[0033] Multiple sets of pressure plate guiding mechanisms 5 for guiding the extrusion of veneers are fixedly connected to the frame. In this embodiment, pressure plate guiding mechanisms 5 are provided at the front end of the preheating box 6 and the drying box 7, inside the heat preservation box 9 and at the outlet end of the heat preservation box 9. The pressure plate guiding mechanisms 5 are distributed along the transmission direction of the metal mesh belt 4, and can press the veneers before, during and after drying to ensure the flatness of the veneers during the transmission process, promote uniform evaporation of moisture, and prevent the edges of the veneers from warping or deforming during drying.

[0034] Electric heaters 14 are fixedly connected to each other in the heat exchange chamber 1 and the drying chamber 7. These electric heaters 14 are existing technology, and preferably intelligent temperature-controlled heaters that can automatically adjust their heating power according to parameters such as the material and moisture content of the boards. A waste heat primary heat exchanger 13, corresponding to the preheating chamber 6, is fixedly connected in the heat exchange chamber 1. The top of the drying chamber 7 is connected to the waste heat primary heat exchanger 13 via a duct fan 8. Specifically, as... Figure 5As shown, the waste heat primary heat exchanger 13 includes a support frame 1309, which is fixedly connected to the frame. Multiple heat exchange pipes 1306 are connected and fixedly run through both ends of the support frame 1309. The heat exchange pipes 1306 have good thermal conductivity and can quickly transfer heat. A heat dissipation mesh (not shown) is fixed to the upper and lower end faces of the support frame 1309. One end of the support frame 1309 is sealed and fixedly connected to an inlet chamber 1303, a first transfer chamber 1304, and an outlet chamber 1305. The other end of the support frame 1309 is sealed and fixedly connected to a second transfer chamber 1307 and a third transfer chamber 1308. The inlet chamber 1303, the first transfer chamber 1304, the outlet chamber 1305, the second transfer chamber 1307, and the third transfer chamber 1308 are respectively connected to the corresponding heat exchange pipes 1306, thus forming an S-shaped steam flow path and extending the heat exchange time between steam and cold air. A steam inlet pipe 1301 is connected to the steam inlet chamber 1303, and the steam inlet pipe 1301 is connected to the pipe fan 8. A steam outlet pipe 1302 is connected to the steam outlet chamber 1305. The top of the drying box 7 is connected to the steam inlet pipe 1301 of the waste heat primary heat exchanger 13 through the pipe fan 8, so that the high-temperature steam generated in the drying box 7 is introduced into the waste heat primary heat exchanger 13. The waste heat primary heat exchanger 13 preheats the preheating box 6 and the heat exchange chamber 1, so as to achieve the initial recovery and utilization of heat.

[0035] A secondary waste heat exchanger 11 is fixedly connected to the side of the drying oven 7. The secondary waste heat exchanger 11 has waste heat recovery channels and air heat exchange channels arranged alternately, which further improves the heat recovery and utilization rate. The steam outlet pipe 1302 of the primary waste heat exchanger 13 is connected to the waste heat recovery channel through the pipe fan 10, and the air heat exchange channel is connected to the heat exchange chamber 1.

[0036] Specifically, such as Figures 6 to 8 As shown, the waste heat secondary heat exchanger 11 includes a heat exchanger shell. Multiple partitions 1105 are arranged in parallel and at equal intervals within the heat exchanger shell. The partitions 1105 are sealed and fixedly connected to the heat exchanger shell to form multiple heat exchange chambers. Odd-numbered heat exchange chambers are connected in series via steam connecting pipes 1106 to form waste heat recovery channels. The steam connecting pipes 1106 are located in the middle of the reversing end of the partitions 1105. Even-numbered heat exchange chambers are connected in series via air connecting pipes 1107 to form air heat exchange channels. The air connecting pipes 1107 are located on one side of the reversing end of the partitions 1105, with adjacent air connecting pipes 1107 located on opposite sides. This extends the cold air heat exchange time, thereby further absorbing waste heat.

[0037] A second steam inlet pipe 1101 is provided on one side of the heat exchanger shell, and a second steam outlet pipe 1104 is provided on the top of the heat exchanger shell. Both the second steam inlet pipe 1101 and the second steam outlet pipe 1104 are equipped with filter screens made of 304 stainless steel wire mesh, which can effectively filter impurities in the steam and prevent impurities from entering the heat exchanger and affecting the heat exchange effect and normal operation of the equipment. The second steam inlet pipe 1101 and the second steam outlet pipe 1104 are respectively connected to the two ends of the waste heat recovery channel. The second steam inlet pipe 1101 is connected to the pipe fan 10. A cold air inlet 1103 is provided on the other side of the heat exchanger shell, which is connected to the air heat exchange channel. A blower 12 is provided at the cold air inlet 1103. An air outlet 1102 is provided at the other end of the air heat exchange channel, which is connected to the heat exchange chamber 1. Blower 12 sends outside cold air into the air heat exchange channel, where it exchanges heat with the steam in the waste heat recovery channel. After that, it is sent into the heat exchange chamber 1 through the air outlet 1102 to provide preheated air for the drying process, so that the drying temperature can be reached more quickly and the energy consumption of electric heater 14 can be saved.

[0038] like Figure 4 As shown, the pressure plate guiding mechanism 5 includes an upper pressure plate roller 501 and a lower pressure plate roller 502 arranged vertically. The lower pressure plate roller 502 is positioned below the upper mesh belt of the metal mesh belt 4 and contacts the lower end face of the upper mesh belt, providing support for the upper mesh belt of the metal mesh belt 4. Fixed bearing seats 503 are rotatably connected to both ends of the lower pressure plate roller 502. The fixed bearing seats 503 are fixedly connected to the frame, ensuring stable operation of the lower pressure plate roller 502 and providing reliable support for the single board. The upper pressure plate roller 501 is positioned above the upper mesh belt of the metal mesh belt 4, and automatic pressing mechanisms are provided at both ends of the upper pressure plate roller 501.

[0039] Specifically, the automatic pressing mechanism includes a fixed base 504, which is fixedly connected to the frame. A movable bearing seat 505 is slidably connected inside the fixed base 504 through a matching slide rail and groove. The slide rail is fixedly connected to the inner side of the fixed base 504. The movable bearing seat 505 has a groove that matches the slide rail. The movable bearing seat 505 is rotatably connected to the upper pressure plate roller 501. A screw 507 is movably connected to the upper end of the movable bearing seat 504 and the fixed base 504. The screw 507 can rotate in the mounting hole of the movable bearing seat 505 and is threadedly connected to the fixed base 504. A spring 506 is sleeved inside the screw 507. The two ends of the spring 506 abut against the fixed base 504 and the movable bearing seat 505, respectively. When the thickness of the veneer changes, the spring 506 can automatically adjust the position of the upper pressure roller 501 to ensure that the upper pressure roller 501 and the lower pressure roller 502 always maintain appropriate pressure on the veneer, which can ensure that the veneer is transported flat and will not be damaged due to excessive pressure.

[0040] A drive motor 3 is fixedly connected to the frame. The drive motor 3 drives the metal mesh belt 4 through corresponding sprockets and chains. The drive motor 3 is a geared motor, which can precisely control the conveying speed of the metal mesh belt 4 according to actual production needs, ensuring that the veneer has sufficient time to complete the drying process in the drying chamber 7, while also meeting different production efficiency requirements. A support plate 401 is provided at the inlet end of the metal mesh belt 4. The support plate 401 is used to temporarily place the veneer and assist it in entering the metal mesh belt 4. An outlet guide plate 402 is provided at the outlet end of the metal mesh belt 4. The outlet guide plate 402 acts as a blocking device to prevent the veneer from flying out. The support plate 401 and the outlet guide plate 402 are fixedly connected to the frame.

[0041] Working Principle: The veneer 15 to be dried is placed on the support plate 401 at the inlet end of the metal mesh belt 4. The drive motor 3 is started, driving the metal mesh belt 4 to smoothly feed the veneer 15 into the device. The veneer 15 first enters the preheating chamber 6, where it is initially heated by the heat recovered from the waste heat primary heat exchanger 13. Hot steam discharged from the top of the drying chamber 7 by the pipe fan 8 enters the steam inlet chamber 1303 of the waste heat primary heat exchanger 13, flows through multiple heat exchange pipes 1306, and exchanges heat with the air in the preheating chamber 6 and the heat exchange chamber 1, creating a suitable preheating temperature environment in the preheating chamber 6. After preheating, the internal moisture of the veneer 15 is initially activated, laying the foundation for subsequent drying and reducing damage to the veneer 15 caused by sudden temperature changes.

[0042] Subsequently, the veneer 15 enters the drying chamber 7 along with the metal mesh belt 4. The electric heaters 14, positioned opposite each other within the drying chamber 7 and heat exchange chamber 1, begin operation, rapidly and evenly heating the interior space of the drying chamber 7. Driven by the drive shaft, the metal mesh belt 4 continuously conveys the veneer 15, ensuring it is heated evenly within the drying chamber 7. During this process, the upper pressure roller 501 and lower pressure roller 502, positioned vertically in the pressure plate guide mechanism 5, work closely together. The spring 506 in the automatic pressing mechanism adaptively adjusts the pressure of the upper pressure roller 501 according to the thickness of the veneer 15, ensuring that the veneer 15 remains flat during transport, preventing warping and deformation, and guaranteeing the consistency and stability of the drying effect.

[0043] After the hot air in the drying oven 7 completes the drying process on the single panel 15, the hot air carrying residual heat is transported to the primary waste heat exchanger 13 via the duct fan 8. The hot air flows within the heat exchange duct 1306, exchanging heat with the outside air to achieve initial heat recovery. After the primary heat exchange, the hot air is then sent to the secondary waste heat exchanger 11 via the duct fan 10. In the secondary waste heat exchanger 11, the odd-numbered heat exchange chambers connected in series via steam connecting pipe 1106 form a waste heat recovery channel, which interweaves with the even-numbered heat exchange chambers connected in series via air connecting pipe 1107 to achieve further heat recovery and utilization. Cold air, driven by the blower 12, enters the air heat exchange channel from the cold air inlet 1103, fully exchanging heat with the hot air in the waste heat recovery channel. After absorbing heat, it is sent to the heat exchange chamber 1 via the outlet 1102 to provide preheated air for the electric heater 14, further improving energy utilization and reducing energy consumption. Once dried, the single board 15 reaches the outlet end as the metal mesh belt 4 rotates, and smoothly leaves the drying device under the guidance of the outlet guide plate 402.

[0044] Finally, although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A veneer drying device for processing of board material, comprising a frame, characterized in that: The rack is fixedly connected with a drying box (7) at the upper end, the drying box (7) is fixedly connected with a preheating box (6) at one side close to the incoming plate end, the other side of the drying box (7) is fixedly connected with a heat preservation box (9), the bottom of the drying box (7) is provided with a heat exchange cavity (1), two ends in the heat exchange cavity (1) are rotatably connected with transmission shafts, the two transmission shafts are commonly connected with a metal mesh belt (4) for conveying single boards, a plurality of pressing plate guide mechanisms (5) for single board extrusion guiding are fixedly connected on the rack, opposite electric heaters (14) are fixedly connected in the heat exchange cavity (1) and the drying box (7) respectively, a waste heat primary heat exchanger (13) corresponding to the preheating box (6) is fixedly connected in the heat exchange cavity (1), and the top of the drying box (7) is communicated with the waste heat primary heat exchanger (13) through a pipeline fan one (8).

2. The veneer drying device for plate processing according to claim 1, characterized in that: The waste heat primary heat exchanger (13) comprises a support frame (1309), a plurality of heat exchange pipelines (1306) are penetratingly and fixedly connected at two ends of the support frame (1309) respectively, an inlet cavity (1303), a transfer cavity one (1304) and an outlet cavity (1305) are sealingly and fixedly connected at one end of the support frame (1309), a transfer cavity two (1307) and a transfer cavity three (1308) are sealingly and fixedly connected at the other end of the support frame (1309), the inlet cavity (1303), the transfer cavity one (1304), the outlet cavity (1305), the transfer cavity two (1307) and the transfer cavity three (1308) are communicated with corresponding heat exchange pipelines (1306) respectively, an inlet pipe one (1301) is communicated on the inlet cavity (1303), the inlet pipe one (1301) is communicated with the pipeline fan one (8), and an outlet pipe one (1302) is communicated on the outlet cavity (1305).

3. The veneer drying device for processing a board according to claim 2, wherein: The drying box (7) is fixedly connected with a waste heat secondary heat exchanger (11) at the side, the waste heat secondary heat exchanger (11) is provided with a waste heat recovery channel and an air heat exchange channel in a staggered mode, the outlet pipe one (1302) of the waste heat primary heat exchanger (13) is communicated with the waste heat recovery channel through a pipeline fan two (10), and the air heat exchange channel is communicated with the heat exchange cavity (1).

4. The veneer drying device for processing a board according to claim 3, wherein: The waste heat secondary heat exchanger (11) comprises a heat exchanger shell, a plurality of partitions (1105) are arranged in parallel and at equal intervals in the heat exchanger shell, the partitions (1105) are sealingly and fixedly connected with the heat exchanger shell and form heat exchange chambers, an odd number of the heat exchange chambers are connected in series to form a waste heat recovery channel through steam communication pipes (1106), and an even number of the heat exchange chambers are connected in series to form an air heat exchange channel through air communication pipes (1107), one side of the heat exchanger shell is provided with a steam inlet pipe two (1101), the top of the heat exchanger shell is provided with a steam outlet pipe two (1104), the steam inlet pipe two (1101) and the steam outlet pipe two (1104) are respectively communicated with two ends of the waste heat recovery channel, and the steam inlet pipe two (1101) is communicated with a pipeline fan two (10); the other side of the heat exchanger shell is provided with a cold air inlet (1103) communicated with the air heat exchange channel, the cold air inlet (1103) is provided with a blower (12), and the other end of the air heat exchange channel is provided with an air outlet (1102) communicated with the heat exchange cavity (1).

5. The veneer drying device for processing a board according to claim 4, wherein: The steam inlet pipe two (1101) and the steam outlet pipe two (1104) are both provided with filter screens.

6. The veneer drying device for plate processing according to claim 1, characterized in that: The pressing plate guide mechanism (5) comprises upper and lower pressing plate rollers (501) and (502), the lower pressing plate roller (502) is arranged below the upper mesh belt of the metal mesh belt (4) and is in contact with the lower end surface of the upper mesh belt, both ends of the lower pressing plate roller (502) are respectively rotatably connected with fixed bearing seats (503) fixedly connected with the rack; the upper pressing plate roller (501) is arranged above the upper mesh belt of the metal mesh belt (4), and both ends of the upper pressing plate roller (501) are respectively provided with automatic pressing mechanisms.

7. The veneer drying device for processing a board according to claim 6, wherein: The automatic pressing mechanism comprises a fixed seat (504) fixedly connected with the rack, a movable bearing seat (505) slidably connected in the fixed seat (504) and rotatably connected with the upper pressing plate roller (501), a screw rod (507) movably connected with the fixed seat (504) and the movable bearing seat (505) at the upper end of the fixed seat (504), and a spring (506) sleeved in the screw rod (507) and abutting against the fixed seat (504) and the movable bearing seat (505) at both ends.

8. The veneer drying device for plate processing according to claim 1, characterized in that: The rack is fixedly connected with a transmission motor (3) driving the metal mesh belt (4), the metal mesh belt (4) is provided with a support plate (401) at an entering plate end and an outboard guide plate (402) at an outboard end, and the support plate (401) and the outboard guide plate (402) are respectively fixedly connected with the rack.

9. The veneer drying device for plate processing according to claim 1, characterized in that: The rack is fixedly connected with a transmission motor (3) driving the metal mesh belt (4), the metal mesh belt (4) is provided with a support plate (401) at an entering plate end and an outboard guide plate (402) at an outboard end, and the support plate (401) and the outboard guide plate (402) are respectively fixedly connected with the rack. The rack is fixedly connected with a transmission motor (3) driving the metal mesh belt (4), the metal mesh belt (4) is provided with a support plate (401) at an entering plate end and an outboard guide plate (402) at an outboard end, and the support plate (401) and the outboard guide plate (402) are respectively fixedly connected with the rack. The rack is provided with support legs (2) at four corners of the bottom.

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