Wood hot air circulation drying equipment

Abstract

The invention relates to the technical field of wood drying equipment, in particular to wood hot air circulation drying equipment which comprises a wood drying machine table and a hot air drying box fixed to the upper portion of the wood drying machine table and used for wood hot air circulation drying, and a board water content detection mechanism is arranged in the wood drying machine table; the board water content detection mechanism comprises a segmented detection electrode, a first detection electrode and a second detection electrode, and the water content of the whole board and the water content of the local area of the board can be accurately detected according to the positive correlation between the capacitance value and the water content between the electrodes. The PLC can adaptively adjust the hot air strength of the hot air circulating device according to a detection result, the hot air amount is increased when the moisture content of the wood board is high, rapid drying is achieved, and the hot air amount is reduced when the moisture content is low; and enhanced wind power drying can be carried out on local areas, with high water content, of the wood boards.

Description

Technical Field

[0001] This invention relates to the field of wood drying equipment technology, and specifically to a wood hot air circulating drying equipment. Background Technology

[0002] The wood hot air circulating dryer is a device specifically designed to reduce the moisture content of wood. It is widely used in construction, furniture, handicrafts and other fields. High-temperature hot air is transported into the drying chamber by a circulating fan through a control system and a conveying system. The hot air comes into full contact with the wet wood and exchanges heat, thereby gradually releasing the moisture inside the wood and achieving the purpose of reducing the moisture content of the wood.

[0003] Existing wood hot air circulation drying equipment mainly adjusts the hot air intensity based on the temperature and humidity environment inside the drying chamber. However, it is unclear about the dynamic changes in the moisture content of the boards themselves inside the drying chamber. This makes it difficult to adaptively adjust the hot air intensity according to the drying condition of the boards. At the same time, the hot air method does not dry the moisture content inside the boards evenly. In order to ensure the drying effect, existing wood hot air circulation drying equipment usually maintains high hot air intensity and long drying time without knowing the drying condition of the boards. This may lead to over-drying of the boards, causing deformation, cracking and other problems that affect the use of the boards. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a wood hot air circulation drying device, which can effectively solve the problems of unclear drying effect and difficulty in actively controlling the drying uniformity of the board in the existing technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a wood hot air circulating drying device, including a wood drying machine platform and a hot air drying box fixed on the upper part of the wood drying machine platform for hot air circulating drying of wood. The wood drying machine platform is equipped with wood boards inside, and a board moisture content detection mechanism is installed inside the wood drying machine platform. The board moisture content detection mechanism includes segmented detection electrodes, a first detection electrode, and a second detection electrode. The segmented detection electrodes are located above the wood boards, the first detection electrode is located on one side of the wood boards, and the second detection electrode is located on the other side of the wood boards opposite to the first detection electrode. A board thickness-adaptive conductive frame is provided outside the segmented detection electrodes for energizing the wood boards. A key drying mechanism for accelerating the drying of high moisture content areas of the wood boards is fixedly connected to one side of the board thickness-adaptive conductive frame.

[0006] Preferably, one end of each of the segmented detection electrode, the first detection electrode, and the second detection electrode is provided with a detection electrode round head, and each of the segmented detection electrode, the first detection electrode, and the second detection electrode is provided with a connecting wire inside. A protective sleeve is fixed on the side surface of each of the segmented detection electrode, the first detection electrode, and the second detection electrode, and is sleeved outside the connecting wire. The protective sleeve slides through the inner wall of the hot air drying oven.

[0007] Preferably, the key drying mechanism includes a dispersed air outlet shell disposed above the wooden board, the top of the dispersed air outlet shell is fixed with an air inlet pipe with a fan, the lower port of the dispersed air outlet shell is embedded with an air outlet plate, the lower end face of the air outlet plate is fixed with an infrared temperature measuring probe, and the upper end face of the air inlet pipe with a fan is provided with an air inlet for hot air intake.

[0008] Preferably, the thickness-adaptive conductive frame includes a rotating support disposed above the wooden board. The inner region of the rotating support is rotatably connected to a conductive roller for rolling contact with the wooden board. The rounded head of the segmented detection electrode adaptively fits onto the outer surface of the conductive roller. The segmented detection electrode is slidably connected to the rotating support. A buffer spring is fixed between the outer shell of the segmented detection electrode and the rotating support, and the buffer spring is sleeved on the outside of the segmented detection electrode.

[0009] Preferably, a reciprocating adjustment assembly is provided on one side of the conductive frame that adapts to the thickness of the plate. The reciprocating adjustment assembly is used to adjust the position of the segmented detection electrode above the wooden board. The reciprocating adjustment assembly includes two adjusting sliding shells fixed on the inner wall of the hot air drying chamber. Adjusting guide blocks are slidably connected inside the two adjusting sliding shells. A reciprocating screw is rotatably connected inside one adjusting sliding shell, and the adjusting guide block is threaded onto the outer surface of the reciprocating screw. A drive motor is fixed on the outer surface of the hot air drying chamber. One end of the reciprocating screw extends out of the adjusting sliding shell and is fixed on the output shaft of the drive motor.

[0010] Preferably, a connecting slide arm is fixed to one side surface of one of the adjustment guide blocks, and a limiting ring plate is fixed to both the side surface and the lower end of the connecting slide arm. A plate thickness adapting spring is fixed between the upper limiting ring plate and the upper end surface of the rotating bracket, and the connecting slide arm slides through the rotating bracket.

[0011] Preferably, both the first and second detection electrodes are fixed with an electric push rod at their tail ends. The housing of the electric push rod is fixed on the side surface of the hot air drying oven. Both the first and second detection electrodes are fitted with a heat-conducting clamping frame for pressing the wooden board. The round head of the detection electrode and the contact end of the heat-conducting clamping frame are on the same vertical plane.

[0012] Preferably, a hot air circulation device is fixed at the upper end of the hot air drying box, and the front and rear ends of the hot air drying box are provided with plate inlets and outlets. A return air suction shell is fixed above the two plate inlets and outlets of the hot air drying box. A return air duct is fixedly connected between the hot air circulation device and the return air suction shell, and a hot air inlet pipe is fixedly connected between the hot air circulation device and the hot air drying box.

[0013] Preferably, a PLC controller is fixed to one side surface of the hot air drying box, and a capacitance detection module is installed inside the PLC controller. A rotary conveyor for feeding wood boards is embedded in the upper part of the wood drying machine platform. The segmented detection electrode, the first detection electrode, and the second detection electrode are electrically connected to the capacitance detection module to form a detection circuit. The drive motor and the electric push rod are both electrically connected to the PLC controller to form a power generation circuit. The fan built into the fan inlet pipe is electrically connected to the PLC controller to form a power generation circuit.

[0014] The technical solution provided by this invention has the following advantages compared with the known prior art: The designed moisture content detection mechanism for the wood panels, including segmented detection electrodes, a first detection electrode, and a second detection electrode, utilizes the positive correlation between the capacitance between the electrodes and the moisture content to accurately detect the overall moisture content of the wood panels and specific local areas. Based on this, the PLC controller can adaptively adjust the hot air intensity of the hot air circulation device according to the detection results; increasing the hot air volume for rapid drying when the moisture content of the wood panels is high, and decreasing the hot air volume when the moisture content is low. By incorporating a moisture content detection mechanism, a targeted drying mechanism, and a reciprocating distance adjustment component, enhanced air drying can be applied to localized areas of the wood panels with high moisture content. The reciprocating distance adjustment component allows segmented detection electrodes to slide back and forth above the wood panels, enabling dynamic monitoring of the moisture content in localized areas and targeted drying. This solves the problem of uneven drying of the internal moisture content of the wood panels by hot air. Furthermore, an infrared temperature probe is installed to detect the surface temperature of the dried area of ​​the wood panels during the targeted drying process of the targeted drying mechanism, preventing excessively high surface temperatures from causing deformation and cracking, thus protecting the wood panels.

[0015] With the set thickness-adaptive conductive frame, the conductive roller can be highly adaptively fine-tuned under the elastic force of the thickness-adaptive spring, adapting to wooden boards of different thicknesses or with slight protrusions and burrs. It can also prevent the round head of the detection electrode from abnormally wearing due to long-term contact with the uneven parts of the wooden board, thus extending the service life of key components. At the same time, the heat-conducting clamping frame on the first and second detection electrodes can correct the deviation of the wooden board, ensuring the posture of the wooden board during subsequent conveying. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the hot air drying oven of the present invention; Figure 3 This is a schematic diagram of the moisture content detection mechanism for sheet metal according to the present invention; Figure 4 This is a schematic diagram of the wooden board structure of the present invention; Figure 5 This is a schematic diagram of the plate thickness adaptable conductive frame structure of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the adjusting sliding shell of the present invention; Figure 7 This is a schematic diagram of the key drying mechanism of the present invention; Figure 8 This is a schematic diagram of the dispersion air outlet shell structure of the present invention; Figure 9 This is a schematic diagram of the second detection electrode structure of the present invention.

[0018] Figure reference numerals: 1. Wood drying machine platform; 2. Hot air drying box; 3. PLC controller; 4. Hot air circulation device; 5. Return suction shell; 6. Return air duct; 7. Hot air inlet pipe; 8. Rotary roller conveyor; 9. Wood board; 10. Board moisture content detection mechanism; 11. Board thickness adaptable conductive frame; 12. Segmented detection electrode; 13. First detection electrode; 14. Second detection electrode; 15. Reciprocating adjustment assembly; 16. Rotating support; 17. Conductive roller; 18. Buffer spring; 9. Detection electrode round head; 20. Protective sleeve; 21. Connecting wire; 22. Reciprocating screw; 23. Adjusting guide block; 24. Connecting slide arm; 25. Plate thickness adapting spring; 26. Drive motor; 27. Adjusting slide shell; 28. Limiting ring plate; 29. ​​Key drying mechanism; 30. Dispersed air outlet shell; 31. Air inlet pipe with fan; 32. Infrared temperature probe; 33. Air outlet plate; 34. Air vent; 35. Heat-conducting pressing frame; 36. Electric push rod; 37. Plate inlet and outlet. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] The present invention will be further described below with reference to embodiments.

[0021] Example: Refer to Figures 1 to 9 A wood hot air circulation drying device includes a wood drying machine platform 1 and a hot air drying chamber 2 fixed on the upper part of the wood drying machine platform 1 for hot air circulation drying of wood. The wood drying machine platform 1 is equipped with wood boards 9 and a board moisture content detection mechanism 10. A hot air circulation device 4 is fixed at the upper end of the hot air drying chamber 2. The front and rear ends of the hot air drying chamber 2 are provided with board inlets and outlets 37. A return suction shell 5 is fixed above the two board inlets and outlets 37 of the hot air drying chamber 2. A return air duct 6 is fixed between the hot air circulation device 4 and the return suction shell 5. A hot air inlet pipe 7 is fixed between the hot air circulation device 4 and the hot air drying chamber 2. The board moisture content detection mechanism 10 includes a segmented detection electrode 12, a first detection electrode 13 and a second detection electrode 14. The first detection electrode 13 and the second detection electrode 14 work together to apply an alternating electric field to the entire wood board 9 to detect the total moisture content in order to cooperate with the hot air intensity control of the hot air circulation device 4.

[0022] The segmented detection electrode 12 is disposed above the wooden board 9, the first detection electrode 13 is disposed on one side of the wooden board 9, and the second detection electrode 14 is disposed on the other side of the wooden board 9 relative to the first detection electrode 13. A board thickness adaptable conductive frame 11 for energizing the wooden board is disposed outside the segmented detection electrode 12. A key drying mechanism 29 for accelerating the drying of high moisture content areas of the wooden board 9 is fixedly connected to one side of the board thickness adaptable conductive frame 11.

[0023] Each of the segmented detection electrode 12, the first detection electrode 13, and the second detection electrode 14 has a detection electrode round head 19 at one end. Each of the segmented detection electrode 12, the first detection electrode 13, and the second detection electrode 14 has a connecting wire 21 inside. A protective sleeve 20 is fixed to the side surface of each of the segmented detection electrode 12, the first detection electrode 13, and the second detection electrode 14, and is fitted over the connecting wire 21. The protective sleeve 20 slides through the inner wall of the hot air drying oven 2. The key drying mechanism 29 includes a dispersing air outlet shell 30 positioned above the wooden board 9. A fan-equipped air inlet pipe 31 is fixed to the top of the dispersing air outlet shell 30, and the lower port of the dispersing air outlet shell 30... An air outlet plate 33 is embedded and fixed inside, and an infrared temperature probe 32 is fixed on the lower end face of the air outlet plate 33. The infrared radiation of the infrared temperature probe 32 can detect the surface temperature of the wood board 9 in the drying area. An air inlet 34 for hot air intake is opened on the upper end face of the fan inlet pipe 31. The first detection electrode 13 or the second detection electrode 14 cooperates with the segmented detection electrodes 12 at different positions on the wood board 9 to form different alternating electric field coverage areas, thereby realizing dynamic monitoring of the local area moisture content of the wood board 9. In conjunction with the key supplementary drying mechanism 29 that absorbs the hot air in the hot air drying box 2, it can enhance the air drying of the local area of ​​the wood board 9 with high moisture content.

[0024] The thickness-adaptive conductive frame 11 includes a rotating support 16 disposed above the wooden board 9. The inner region of the rotating support 16 is rotatably connected to a conductive roller 17 for rolling contact with the wooden board 9. The conductive roller 17 has the ability to highly adapt and finely adjust under the elastic force of the thickness-adaptive spring 25. The detection electrode round head 19 of the segmented detection electrode 12 adaptively fits against the side surface of the conductive roller 17. The segmented detection electrode 12 is slidably connected to the rotating support 16. A buffer spring 18 is fixed between the outer shell of the segmented detection electrode 12 and the rotating support 16, and the buffer spring 18 is sleeved on the outside of the segmented detection electrode 12.

[0025] A reciprocating adjustment assembly 15 is provided on one side of the thickness-adaptive conductive frame 11. The reciprocating adjustment assembly 15 can drive the thickness-adaptive conductive frame 11, which is equipped with segmented detection electrodes 12, to slide back and forth along the wooden board 9. The reciprocating adjustment assembly 15 is used to adjust the position of the segmented detection electrodes 12 above the wooden board 9. The reciprocating adjustment assembly 15 includes two adjusting sliding shells 27 fixed on the inner wall of the hot air drying oven 2. Adjusting guide blocks 23 are slidably connected inside the two adjusting sliding shells 27. The internal rotating connection of 7 is a reciprocating screw 22, and the adjusting guide block 23 is threaded on the outer surface of the reciprocating screw 22. The outer surface of the hot air drying box 2 is fixed with a drive motor 26. One end of the reciprocating screw 22 extends out of the adjusting slide 27 and is fixed on the output shaft of the drive motor 26. The reciprocating adjustment assembly 15 can drive the plate thickness adaptable conductive frame 11 equipped with segmented detection electrodes 12 to slide back and forth along the wooden board 9, so that the position of the segmented detection electrodes 12 above the wooden board 9 can be dynamically adjusted.

[0026] A connecting slide arm 24 is fixed to one side surface of an adjusting guide block 23. A limiting ring plate 28 is fixed to the side surface and the lower end of the connecting slide arm 24. A plate thickness adapting spring 25 is fixed between the upper limiting ring plate 28 and the upper end surface of the rotating bracket 16. The connecting slide arm 24 slides through the rotating bracket 16.

[0027] Electric push rods 36 are fixed to the tail ends of the first detection electrode 13 and the second detection electrode 14. The housing of the electric push rod 36 is fixed to the side surface of the hot air drying oven 2. A heat-conducting clamping frame 35 for pressing the wooden board 9 is fitted and fixed on the housing of the first detection electrode 13 and the second detection electrode 14. The contact end of the detection electrode round head 19 and the heat-conducting clamping frame 35 are on the same vertical plane, which can prevent the detection electrode round head 19 from abnormal wear caused by long-term contact with the uneven parts on the wooden board 9, thereby extending the service life of key components.

[0028] A PLC controller 3 is fixed on one side of the hot air drying box 2. The PLC controller 3 has a capacitance detection module inside. A rotary conveyor 8 for feeding wood boards 9 is embedded in the upper part of the wood drying machine platform 1. The segmented detection electrode 12, the first detection electrode 13 and the second detection electrode 14 are electrically connected to the capacitance detection module to form a detection circuit. The drive motor 26 and the electric push rod 36 are both electrically connected to the PLC controller 3 to form a power generation circuit. The fan built into the fan inlet pipe 31 is electrically connected to the PLC controller 3 to form a power generation circuit.

[0029] The working principle of the present invention is as follows: Before use, the wooden board 9 is conveyed by the rollers on the roller conveyor 8 and enters the hot air drying chamber of the hot air drying box 2 through the board inlet and outlet 37. At this time, the hot air generated by the hot air circulation device 4 (50 to 60 degrees Celsius suitable for board drying) enters the hot air drying chamber of the hot air drying box 2 through the hot air inlet pipe 7. After the wooden board 9 enters the hot air drying chamber 2, the electric push rod 36 controls the first detection electrode 13 and the second detection electrode 14 to move closer to each other until they are pressed tightly against both sides of the wooden board 9. This ensures that the first detection electrode 13 and the second detection electrode 14 are stably mounted on the wooden board 9 so that a high-frequency alternating electric field can be applied subsequently (the instrument generates an alternating electric field through contact electrodes, and the alternating electric field covers the moisture distribution in a certain area). Since the capacitance value between the electrodes is positively correlated with the moisture content: the higher the moisture content, the greater the dielectric constant of the wood, and the higher the capacitance value, the change in capacitance value between the detection electrodes is converted into a preset "dielectric constant-moisture content" mathematical model (such as linear regression or polynomial fitting). Moisture content value; Thus, the first detection electrode 13 and the second detection electrode 14 work together to apply an alternating electric field to the entire board 9 to detect the total moisture content in order to coordinate with the hot air intensity control of the hot air circulation device 4. That is, the total moisture content of the board 9 is fed back through the detected capacitance value, and then the detection result of the overall moisture content of the board 9 is transmitted to the PLC controller 3. The PLC controller 3 adaptively adjusts the hot air intensity control of the hot air circulation device 4 into the hot air drying box 2. That is, when the moisture content of the board 9 is high, the amount of hot air circulated by the hot air circulation device 4 into the hot air drying box 2 is increased for rapid drying, and vice versa. During the hot air drying process of the wooden board 9, the drive motor 26 is turned on and drives the reciprocating screw 22 to rotate inside the adjusting slide 27. Since the adjusting guide block 23 is threaded onto the reciprocating screw 22, the reciprocating movement of the adjusting guide block on the reciprocating screw can drive the rotating support 16 connected to one end of the sliding arm 24 and the conductive roller 17 below to reciprocate. Thus, the reciprocating pitch adjustment assembly 15 can drive the board thickness adapting conductive frame 11 equipped with the segmented detection electrode 12 to slide back and forth along the wooden board 9. This can dynamically adjust the position of the segmented detection electrode 12 above the wooden board 9, so that the first detection electrode 13 or the second detection electrode 14 cooperates with the segmented detection electrode 12 at different positions on the wooden board 9 to form different alternating currents. The electric field covers the area, thereby enabling dynamic monitoring of the local moisture content of the wood board 9. In conjunction with the key drying mechanism 29 that absorbs the hot air from the hot air drying box 2, it can enhance the air drying of the local areas of the wood board 9 with high moisture content (that is, the local moisture content of the wood board 9 is fed back by the detected capacitance value, and then the detection result of the local moisture content of the wood board 9 is transmitted to the PLC controller 3. The PLC controller 3 adaptively adjusts the hot air intensity of the key drying mechanism 29, and the key drying mechanism 29 increases the speed of the fan built into the fan in the fan inlet pipe 31, so as to guide the hot air in the drying chamber to be sprayed from the air outlet plate 33 of the dispersed air outlet shell 30 for rapid drying of the local areas of the wood board 9). During the short-term (5 to 8 seconds) targeted air drying process of the reciprocating key drying mechanism 29, the infrared irradiation of the infrared temperature probe 32 can detect the surface temperature of the wood board 9 in the drying area, thereby preventing the surface temperature of the wood board 9 from being too high and causing it to deform and crack. In this way, the infrared temperature probe 32, together with the key drying mechanism 29, can protect the board during the drying process. During the use of the conductive roller 17, the conductive roller 17 has the ability to highly adapt and finely adjust under the elastic force of the plate thickness adaptation spring 25. In this way, the conductive roller 17 can roll and shift on the wooden board 9 of different thicknesses or with slight protrusions and burrs. In addition, the two parallel stroke heat-conducting clamping frames 35 on the first detection electrode 13 and the second detection electrode 14 can correct the wooden board 9 on the roller conveyor 8 to be placed at the center angle as they continuously approach each other, thereby ensuring that the wooden board 9 maintains a centered posture when it is subsequently conveyed out. Since the easily detachable conductive roller 17 replaces the detection electrode round head 19 at the lower end of the segmented detection electrode 12 to contact the wooden board 9, this can prevent the detection electrode round head 19 from abnormally wearing due to long-term contact with the uneven parts on the wooden board 9, thereby extending the service life of key components. During the drying process, the return suction shells 5 on both sides of the inlet and outlet 37 of the hot air drying box 2 absorb the escaping hot air and deliver it to the air inlet of the hot air circulation device 4 through the return air duct 6 to achieve circulating air drying. During the drying process, the segmented detection electrode 12, the first detection electrode 13 and the second detection electrode 14 are electrically connected to the capacitance detection module to form a detection circuit. The drive motor 26 and the electric push rod 36 are both electrically connected to the PLC controller 3. That is, the control of the segmented detection electrode 12, the first detection electrode 13, the second detection electrode 14, the hot air circulation device 4 and the electric push rod 36 are all realized by the PLC controller 3 with the preset program.

[0030] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wood hot air circulating drying device, comprising a wood drying machine platform (1) and a hot air drying box (2) fixed on the upper part of the wood drying machine platform (1) for hot air circulating drying of wood, characterized in that, The wood drying machine (1) is equipped with a wooden board (9) inside. The wood drying machine (1) is equipped with a board moisture content detection mechanism (10) inside. The board moisture content detection mechanism (10) includes a segmented detection electrode (12), a first detection electrode (13), and a second detection electrode (14). The segmented detection electrode (12) is located above the wooden board (9). The first detection electrode (13) is located on one side of the wooden board (9). The second detection electrode (14) is located on the other side of the wooden board (9) opposite to the first detection electrode (13). The segmented detection electrode (12) is equipped with a board thickness adaptable conductive frame (11) for energizing the wooden board. A key drying mechanism (29) for accelerating the drying of high moisture content areas of the wooden board (9) is fixedly connected to one side of the board thickness adaptable conductive frame (11).

2. The wood hot air circulating drying equipment according to claim 1, characterized in that, One end of each of the segmented detection electrode (12), the first detection electrode (13), and the second detection electrode (14) is provided with a detection electrode round head (19). Each of the segmented detection electrode (12), the first detection electrode (13), and the second detection electrode (14) is provided with a connecting wire (21). A protective sleeve (20) is fixed on the side surface of the segmented detection electrode (12), the first detection electrode (13), and the second detection electrode (14) and is sleeved on the outside of the connecting wire (21). The protective sleeve (20) slides through the inner wall of the hot air drying oven (2).

3. The wood hot air circulating drying equipment according to claim 1, characterized in that, The key drying mechanism (29) includes a dispersed air outlet shell (30) set above the wooden board (9). The top of the dispersed air outlet shell (30) is fixed with an air inlet pipe (31) with a fan. An air outlet plate (33) is embedded in the lower port of the dispersed air outlet shell (30). An infrared temperature probe (32) is fixed on the lower end face of the air outlet plate (33). An air inlet (34) for hot air intake is opened on the upper end face of the air inlet pipe (31).

4. The wood hot air circulating drying equipment according to claim 1, characterized in that, The thickness-adaptive conductive frame (11) includes a rotating support (16) disposed above the wooden board (9). The inner area of ​​the rotating support (16) is rotatably connected to a conductive roller (17) for rolling contact with the wooden board (9). The detection electrode round head (19) of the segmented detection electrode (12) is adaptively attached to the side surface of the conductive roller (17). The segmented detection electrode (12) is slidably connected to the rotating support (16). A buffer spring (18) is fixed between the outer shell of the segmented detection electrode (12) and the rotating support (16), and the buffer spring (18) is sleeved on the outside of the segmented detection electrode (12).

5. A wood hot air circulating drying device according to claim 4, characterized in that, A reciprocating adjustment assembly (15) is provided on one side of the plate thickness adaptable conductive frame (11). The reciprocating adjustment assembly (15) is used to adjust the position of the segmented detection electrode (12) above the wooden board (9). The reciprocating adjustment assembly (15) includes two adjustment sliding shells (27) fixed on the inner wall of the hot air drying box (2). The two adjustment sliding shells (27) are slidably connected to the interior of the two adjustment sliding shells (27). A reciprocating screw (22) is rotatably connected to the interior of one adjustment sliding shell (27). The adjustment guide block (23) is threaded on the outer surface of the reciprocating screw (22). A drive motor (26) is fixed on the outer surface of the hot air drying box (2). One end of the reciprocating screw (22) extends out of the adjustment sliding shell (27) and is fixed on the output shaft of the drive motor (26).

6. A wood hot air circulating drying device according to claim 5, characterized in that, A connecting slide arm (24) is fixed on one side surface of one of the adjustment guide blocks (23). A limiting ring plate (28) is fixed on the side surface and the lower end of the connecting slide arm (24). A plate thickness adaptation spring (25) is fixed between the upper limiting ring plate (28) and the upper end surface of the rotating bracket (16). The connecting slide arm (24) slides through the rotating bracket (16).

7. A wood hot air circulating drying device according to claim 2, characterized in that, Both the first detection electrode (13) and the second detection electrode (14) are fixed with electric push rods (36). The housing of the electric push rod (36) is fixed on the side surface of the hot air drying box (2). Both the first detection electrode (13) and the second detection electrode (14) are fitted with heat-conducting clamping frames (35) for pressing the wooden board (9). The round head (19) of the detection electrode and the contact end of the heat-conducting clamping frame (35) are on the same vertical plane.

8. A wood hot air circulating drying device according to claim 1, characterized in that, The hot air drying box (2) is fixed with a hot air circulation device (4) at the top. The front and rear ends of the hot air drying box (2) are provided with plate inlet and outlet (37). The two plate inlet and outlet (37) of the hot air drying box (2) are fixed with a return suction shell (5). The hot air circulation device (4) and the return suction shell (5) are connected and fixed with a return air pipe (6). The hot air circulation device (4) and the hot air drying box (2) are connected and fixed with a hot air inlet pipe (7).

9. A wood hot air circulating drying device according to claim 3, characterized in that, A PLC controller (3) is fixed on one side surface of the hot air drying box (2). The PLC controller (3) is equipped with a capacitance detection module. A rotary conveyor (8) for feeding wood boards (9) is embedded in the upper part of the wood drying machine platform (1). The segmented detection electrode (12), the first detection electrode (13), and the second detection electrode (14) are electrically connected to the capacitance detection module to form a detection circuit. The drive motor (26) and the electric push rod (36) are both electrically connected to the PLC controller (3) to form a power generation circuit. The fan built into the fan inlet pipe (31) is electrically connected to the PLC controller (3) to form a power generation circuit.

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