Drying and conveying system for biomass fuel

Abstract

The utility model relates to the technical field of drying, in particular to a drying and conveying system for biomass fuel, which comprises a drying box, an air inlet is arranged at the top of the drying box, a conveying device is arranged in the drying box, and a plurality of air chambers partitioned by a plurality of air partition plates are arranged in the drying box along the conveying direction of the conveying device. The two ends of the air partition plate are fixedly connected to the front inner wall and the rear inner wall of the drying box respectively, the multiple air chambers are arranged below the conveying device, a side plate of the drying box is externally connected with multiple negative pressure fans, each negative pressure fan is communicated with the corresponding air chamber, and a spiral discharging device is arranged below the left end of the conveying device. And a height-adjustable feeding device is arranged above the right end of the conveying device. Fuel is evenly and flatly laid on the conveying belt through the first spiral piece and the second spiral piece which rotate in the opposite directions, and the drying efficiency and the drying effect are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drying, in particular to a drying and conveying system for biomass fuel. Background Art

[0002] There are many drying equipments at present, including drum dryers, belt dryers, airflow dryers, etc., which are of various forms and have their own advantages and disadvantages. However, during the drying process, the fuel is easy to pile up together, resulting in the fuel on the surface being dried while the fuel inside is still wet, resulting in low drying efficiency and poor drying effect. Utility Model Content

[0003] The purpose of the utility model is to provide a drying and conveying system for biomass fuel, so as to solve the problem mentioned in the background technology that the fuel is easily piled up during the drying process, resulting in the fuel on the surface being dried while the fuel inside is still wet, resulting in low drying efficiency and poor drying effect.

[0004] The utility model adopts the following technical solutions:

[0005] The utility model provides a drying and conveying system for biomass fuel, comprising a drying box, wherein an air inlet is arranged on the top of the drying box, a conveying device is arranged in the drying box, a plurality of air chambers separated by a plurality of air baffles are arranged in the drying box along the conveying direction of the conveying device, the two ends of the air baffles are respectively fixedly connected to the front and rear inner walls of the drying box, a plurality of the air chambers are arranged below the conveying device, a plurality of negative pressure fans are externally connected to the side panels of the drying box, each of the negative pressure fans is communicated with the corresponding air chamber, a spiral unloading device is arranged below the left end of the conveying device, and a feeding device with adjustable height is arranged above the right end of the conveying device;

[0006] The feeding device comprises a feeding box, which is arranged at the right end of the drying box, and an arc-shaped rear bottom plate is arranged in the feeding box, the upper end of the rear bottom plate extends to the top of the feeding box, and is enclosed with the feeding box to form a feeding port, the bottom end of the rear bottom plate extends upward and is connected to the arc-shaped front bottom plate, and the bottom end of the front bottom plate is enclosed with the feeding box to form a discharging port, and the discharging port is located above the conveying device; a first rotating shaft is arranged in a first cavity enclosed by the rear bottom plate and the feeding box, and a second rotating shaft is arranged in a second cavity enclosed by the front bottom plate and the feeding box, and the first rotating shaft and the second rotating shaft and the two ends of the second rotating shaft are respectively The first and second motors are respectively arranged on the front wall of the feed box, and the first and second motors are respectively arranged on the front wall of the feed box. The first and second spiral plates are respectively arranged on the first and second spiral plates, and the rear end of the first spiral plate is provided with a plurality of first dividing plates evenly arranged along the circumferential direction of the first shaft, and the first dividing plates are fixedly connected to the first shaft, and the front end of the second spiral plate is provided with a plurality of second dividing plates evenly arranged along the circumferential direction of the second shaft, and the second dividing plates are fixedly connected to the second shaft.

[0007] Furthermore, a material turner is arranged above the conveyor belt, and the material turner includes a third motor. The third motor is fixed on the side wall of the drying box, and a plurality of material turners arranged along the circumferential direction are arranged at the output end of the third motor.

[0008] Furthermore, a mesh belt cleaning device is provided on the left side of the deviation adjustment mechanism, and the mesh belt cleaning device includes a water pipe connected to an external water source, and the water pipe is connected to the inner wall of the drying box through a lifting assembly, and a plurality of high-pressure nozzles are arranged on the water pipe, and the water outlet of the high-pressure nozzle faces the inner surface of the conveyor belt.

[0009] Furthermore, a lifting device is provided at the bottom end of the feed box; the lifting device includes a first lifter, a second lifter, a third lifter and a fourth lifter, the telescopic ends of the first lifter, the second lifter, the third lifter and the fourth lifter are connected to the bottom of the feed box, and the bottom ends of the first lifter, the second lifter, the third lifter and the fourth lifter are all provided with support columns, and the support columns are fixed to the bottom end of the drying box.

[0010] Further, the first lifter, the second lifter, the third lifter and the fourth lifter are all worm gear lifters;

[0011] The worm gears of the first lifter and the second lifter are connected by a first chain assembly, a connecting rod is arranged between the second lifter and the third lifter, couplings are arranged at both ends of the connecting rod, the two couplings are respectively connected to the worm gears of the second lifter and the third lifter, and the worm gears of the third lifter and the fourth lifter are connected by a second chain assembly.

[0012] Furthermore, a Z-shaped rotating handle is provided at the left end of the worm of the first lifter.

[0013] Furthermore, an air guide plate is provided above the conveying device, the four sides of the air guide plate are sealedly connected to the inner wall of the drying box, and the space above the air guide plate is an air guide chamber;

[0014] The air guide plate is provided with a grille plate on a side away from the negative pressure fan, and the air guide chamber is communicated with the space below the air guide plate through the grille plate.

[0015] Furthermore, the air inlet is arranged on the top plate of the drying box on a side away from the grille plate, and the air guide plate is a U-shaped structure.

[0016] Compared with the prior art, the beneficial technical effects of the utility model are:

[0017] The utility model evenly spreads the fuel on the conveyor belt through the first spiral blade and the second spiral blade rotating in opposite directions, thereby greatly improving the drying efficiency and the drying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model will be further described below in conjunction with the accompanying drawings.

[0019] Figure 1 This is a front cross-sectional view of a drying and conveying system for biomass fuel in an embodiment of the utility model;

[0020] Figure 2 It is a top view of a drying and conveying system for biomass fuel in an embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the external structure of the feeding device in the embodiment of the utility model;

[0022] Figure 4 It is a side sectional view of a feeding device in an embodiment of the utility model;

[0023] Figure 5 It is a schematic diagram of the internal structure of the feeding device in the embodiment of the utility model;

[0024] Figure 6 It is a structural schematic diagram of a feed box in an embodiment of the utility model;

[0025] Figure 7 It is a structural schematic diagram of the conveying device in the embodiment of the utility model;

[0026] Figure 8 It is a structural schematic diagram of a material turner in an embodiment of the utility model;

[0027] Fig. 9 It is a structural schematic diagram of a mesh belt cleaning device in an embodiment of the utility model;

[0028] Fig.10 for Fig. 9 The enlarged view of point A in the middle;

[0029] Fig.11 It is a top view of the lifting device in the embodiment of the utility model;

[0030] Fig.12 It is a front view of the lifting device in the embodiment of the utility model;

[0031] Fig.13 It is a side sectional view of a drying and conveying system for biomass fuel in an embodiment of the utility model.

[0032] Explanation of the reference numerals: 1. drying box; 101. air inlet; 2. conveying device; 201. active roller; 202. driven roller; 203. first redirecting roller; 204. tensioning roller; 205. second redirecting roller; 206. deviation adjustment mechanism; 207. conveyor belt; 208. first supporting roller; 209. second supporting roller; 3. wind shield; 4. air chamber; 5. negative pressure fan; 6. spiral unloading device; 7. feeding device; 701. feeding box; 701-1. feeding port; 701-2. discharging port; 702. rear bottom plate; 702-1. front bottom plate; 703. first rotating shaft; 704. second rotating shaft; 705. first motor; 706. second motor ;707, first spiral sheet;708, second spiral sheet;709, first material dividing sheet;710, second material dividing sheet;8, lifting device;801, first lifter;802, second lifter;803, lifter;804, fourth lifter;805, first chain assembly;806, connecting rod;807, coupling;808, second chain assembly;809, rotating handle;8010, support column;9, turner;901, third motor;902, turner plate;10, mesh belt cleaning device;1001, water pipe;1002, lifting assembly;1003, high-pressure nozzle;11, air guide plate;12, air guide chamber;13, grille plate;14, fuel to be dried. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0034] like Figure 1 and 2 As shown, the present embodiment discloses a drying and conveying system for biomass fuel, including a drying box 1, a top of the drying box 1 is provided with an air inlet 101, the air inlet 101 is connected to a hot air source, and the specific hot air can be kiln exhaust gas, a conveying device 2 is provided in the drying box 1, and a plurality of air chambers 4 separated by a plurality of air baffles 3 are provided in the drying box 1 along the conveying direction of the conveying device 2, the two ends of the air baffles 3 are respectively fixedly connected to the front and rear inner walls of the drying box 1, a plurality of air chambers 4 are arranged below the conveying device 2, a plurality of negative pressure fans 5 are externally connected to the side panels of the drying box 1, and each negative pressure fan 5 is connected to the corresponding air chamber 4, a spiral unloading device 6 is provided below the left end of the conveying device 2, and a feeding device 7 with adjustable height is provided above the right end of the conveying device 2.

[0035] like Figures 3 to 6The feeding device 7 includes a feeding box 701, which is arranged at the right end of the drying box 1. An arc-shaped rear bottom plate 702 is arranged in the feeding box 701. The upper end of the rear bottom plate 702 extends to the top of the feeding box 701 and is enclosed with the feeding box 701 to form a feeding port 701-1. The bottom end of the rear bottom plate 702 extends upward and is connected to the arc-shaped front bottom plate 702-1. The connection between the rear bottom plate 702 and the front bottom plate 702-1 forms an upward protrusion. The bottom end of the front bottom plate 702-1 and the feeding box 701 are enclosed to form a discharge port 701. -2, the discharge port 701-2 is located above the conveying device 2, and the width of the discharge port 701-2 is smaller than the width of the conveyor belt 207, so as to ensure that the fuel 14 to be dried can fall completely on the conveyor belt 207; a first rotating shaft 703 is arranged in the first cavity formed by the rear bottom plate 702 and the feed box 701, and a second rotating shaft 704 is arranged in the second cavity formed by the front bottom plate 702-1 and the feed box 701, the first rotating shaft 703 and the second rotating shaft 704 are arranged side by side, and the two ends of the first rotating shaft 703 and the second rotating shaft 704 are respectively The first rotating shaft 703 and the second rotating shaft 704 are rotatably connected to the front and rear walls of the feed box 701, one end of the first rotating shaft 703 and the second rotating shaft 704 are respectively connected to the output ends of the first motor 705 and the second motor 706, the first motor 705 and the second motor 706 are both arranged on the front wall of the feed box 701, the first rotating shaft 703 and the second rotating shaft 704 are respectively provided with a first spiral sheet 707 and a second spiral sheet 708, the rear end of the first spiral sheet 707 is provided with a plurality of first dividing sheets 709 evenly arranged along the circumferential direction of the first rotating shaft 703, and the first dividing sheets 709 are arranged on the rear end of the first spiral sheet 707. 09 is fixedly connected to the first rotating shaft 703, and a plurality of second dividing pieces 710 are arranged evenly along the circumferential direction of the second rotating shaft 704 at the front end of the second spiral piece 708. The second dividing pieces 710 are fixedly connected to the second rotating shaft 704. The first spiral piece 707 and the second spiral piece 708 are arranged in the same manner but rotate in opposite directions, which can ensure that the fuel 15 to be dried is pushed back and forth by the first spiral piece 707 and the second spiral piece 708, so that the fuel 15 to be dried is evenly spread on the conveying device 2.

[0036] like Figure 7As shown, in this embodiment, the conveying device 2 includes an active roller 201 and a driven roller 202, and the active roller 201 and the driven roller 202 are rotatably connected to the left and right ends of the drying box 1 respectively. A first redirecting roller 203 is arranged below the active roller 201, and a tensioning roller 204 that can be adjusted up and down is arranged below the first redirecting roller 203. The tensioning roller 204 is connected to the drying box 1 through a lead screw. The position of the tensioning roller 204 can be adjusted by adjusting the extension amount of the lead screw, and the tension of the conveyor belt 207 can be adjusted. A second redirecting roller 205 is arranged on the upper right of the tensioning roller 204, and a deviation adjustment mechanism 206 is arranged on the lower left of the driven roller 202. The deviation adjustment mechanism 206 prevents the conveyor belt 207 from deflecting. The active roller 201, the driven roller 202, the deviation adjustment mechanism 206, the second redirecting roller 205, the tensioning roller 204 and the first redirecting roller 203 are wound with a conveyor belt 207 with holes.

[0037] A plurality of first supporting rollers 208 are arranged between the active roller 201 and the driven roller 202, and the upper surfaces of the active roller 201, the driven roller 202 and the first supporting roller 208 are tangent to the same horizontal plane. A plurality of second supporting rollers 209 are arranged between the second redirecting roller 205 and the deviation adjusting mechanism 206, and the upper surfaces of the second redirecting roller 205, the deviation adjusting mechanism 206 and the second supporting roller 209 are tangent to the same horizontal plane. The first supporting roller 208 and the second supporting roller 209 can support the conveyor belt.

[0038] like Figure 8 As shown, in this embodiment, a material turner 9 is arranged above the conveyor belt 209, and the material turner 9 includes a third motor 901. The third motor 901 is fixed on the side wall of the drying box 1, and a plurality of material turners 902 arranged along the circumferential direction are arranged at the output end of the third motor 901.

[0039] like Fig. 9 and 10 As shown, in this embodiment, a mesh belt cleaning device 10 is arranged on the left side of the deviation adjustment mechanism 206, and the mesh belt cleaning device 10 includes a water pipe 1001 connected to an external water source, and the water pipe 1001 is connected to the inner wall of the drying box 1 through a lifting assembly 1002, and a plurality of high-pressure nozzles 1003 are arranged on the water pipe 1001, and the water outlet of the high-pressure nozzle 1003 faces the inner surface of the conveyor belt 209. The cleaning device 10 can clean the residual fuel 14 to be dried on the conveyor belt to ensure the air permeability of the conveyor belt 207, and the waste water after cleaning the conveyor belt 209 flows to the pit below the drying box 1.

[0040] like Fig.11 and 12As shown, in this embodiment, a lifting device 8 is provided at the bottom end of the feed box 701, and the lifting device 8 can adjust the interval between the feed box 7 and the conveyor belt 207, thereby adjusting the thickness of the fuel 14 to be dried spread on the conveyor belt 207; the lifting device 8 includes a first lifter 801, a second lifter 802, a third lifter 803 and a fourth lifter 804, and the telescopic ends of the first lifter 801, the second lifter 802, the third lifter 803 and the fourth lifter 804 are connected to the bottom of the feed box 701, and the bottom ends of the first lifter 801, the second lifter 802, the third lifter 803 and the fourth lifter 804 are all provided with support columns 8010, and the support columns 8010 are fixed to the bottom end of the drying box 1.

[0041] In this embodiment, the first lifter 801, the second lifter 802, the third lifter 803 and the fourth lifter 804 are all worm gear lifters. The worm gears of the first lifter 801 and the second lifter 802 are connected by a first chain assembly 805. A connecting rod 806 is arranged between the second lifter 802 and the third lifter 803. Couplings 807 are arranged at both ends of the connecting rod 806. The two couplings 807 are respectively connected to the worm gears of the second lifter 802 and the third lifter 803. The worm gears of the third lifter 803 and the fourth lifter 804 are connected by a second chain assembly 808.

[0042] In this embodiment, a Z-shaped rotating handle 809 is provided at the left end of the worm of the first lifter 801 .

[0043] like Fig.13 As shown, in this embodiment, an air guide plate 11 is arranged above the conveying device 2, and the four sides of the air guide plate 11 are sealed and connected to the inner wall of the drying box 1, and the space above the air guide plate 11 is an air guide chamber 12; the air guide plate 11 is provided with a grille plate 13 on the side away from the negative pressure fan 5, and the air guide chamber 12 is connected with the space below the air guide plate 11 through the grille plate 13. The air guide plate 11 mainly plays a damping role, reducing the wind pressure to prevent the hot air from blowing away the fuel 14 to be dried.

[0044] In this embodiment, the air inlet 101 is arranged on the top plate of the drying box 1 at a side away from the grille plate 13, and the air guide plate 11 is a U-shaped structure.

[0045] The use process of the utility model is as follows:

[0046] First, the air inlet 101 of the drying and conveying system for biomass fuel is connected to the hot air source, the negative pressure fan 5 is turned on, and then the fuel 14 to be dried is added to the feed box 701 from the feed inlet 701-1. The fuel 14 to be dried is spread on the conveyor belt 207 under the action of the second spiral blade 708. The excess fuel 14 to be dried is pushed to the second dividing sheet 710 by the second spiral blade 708, and the second dividing sheet 710 transfers it to the first spiral blade 707, and the first spiral blade 707 pushes it to the second dividing sheet 710. At a material dividing piece 709, the first material dividing piece 709 transfers it to the second spiral piece 708, and the fuel to be dried 14 is moved back and forth in this way, and finally evenly spread on the conveyor belt 207. When the fuel to be dried on the conveyor belt 207 is transported to the turner 9, the turner 9 turns the fuel to be dried 14. In this process, hot air passes through the fuel to be dried 14 under the action of the negative pressure fan 5 to dry it. The dried fuel 14 falls into the spiral unloading device 6, and the spiral unloading device 6 unloads it.

[0047] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A drying and conveying system for biomass fuel, characterized in that: The invention comprises a drying box (1), wherein an air inlet (101) is arranged at the top of the drying box (1), a conveying device (2) is arranged inside the drying box (1), a plurality of air chambers (4) separated by a plurality of air baffles (3) are arranged inside the drying box (1) along the conveying direction of the conveying device (2), the two ends of the air baffles (3) are respectively fixedly connected to the front and rear inner walls of the drying box (1), a plurality of air chambers (4) are arranged below the conveying device (2), a plurality of negative pressure fans (5) are externally connected to the side panels of the drying box (1), each of the negative pressure fans (5) is connected to the corresponding air chamber (4), a spiral unloading device (6) is arranged below the left end of the conveying device (2), and a feeding device (7) with adjustable height is arranged above the right end of the conveying device (2); The feeding device (7) comprises a feeding box (701), wherein the feeding box (701) is arranged at the right end of the drying box (1), and an arc-shaped rear bottom plate (702) is arranged in the feeding box (701), wherein the upper end of the rear bottom plate (702) extends to the top of the feeding box (701) and is enclosed with the feeding box (701) to form a feeding port (701-1), and the bottom end of the rear bottom plate (702) extends upward and is connected to the arc-shaped front bottom plate (702-1), and the bottom end of the front bottom plate (702-1) is connected to the The feed box (701) is enclosed to form a discharge port (701-2), and the discharge port (701-2) is located above the conveying device (2); a first rotating shaft (703) is arranged in a first cavity enclosed by the rear bottom plate (702) and the feed box (701), and a second rotating shaft (704) is arranged in a second cavity enclosed by the front bottom plate (702-1) and the feed box (701), and the first rotating shaft (703) and the second rotating shaft (704) are arranged side by side, and the first rotating shaft (703) and the second rotating shaft (704) are arranged side by side. The two ends of the first rotating shaft (703) and the second rotating shaft (704) are respectively rotatably connected to the front and rear walls of the feed box (701), one end of the first rotating shaft (703) and the second rotating shaft (704) are respectively connected to the output ends of the first motor (705) and the second motor (706), the first motor (705) and the second motor (706) are both arranged on the front wall of the feed box (701), and the first rotating shaft (703) and the second rotating shaft (704) are respectively provided with a first spiral sheet (707 ) and a second spiral sheet (708), the rear end of the first spiral sheet (707) is provided with a plurality of first dividing sheets (709) evenly arranged along the circumferential direction of the first rotating shaft (703), the first dividing sheets (709) are fixedly connected to the first rotating shaft (703), and the front end of the second spiral sheet (708) is provided with a plurality of second dividing sheets (710) evenly arranged along the circumferential direction of the second rotating shaft (704), the second dividing sheets (710) are fixedly connected to the second rotating shaft (704).

2. The drying and conveying system for biomass fuel according to claim 1, characterized in that: The conveying device (2) comprises an active roller (201) and a driven roller (202), wherein the active roller (201) and the driven roller (202) are rotatably connected to the left and right ends of the drying box (1) respectively, a first redirecting roller (203) is arranged below the active roller (201), a tensioning roller (204) which can be adjusted up and down is arranged below the first redirecting roller (203), a second redirecting roller (205) is arranged at the upper right of the tensioning roller (204), a deviation adjustment mechanism (206) is arranged at the lower left of the driven roller (202), and a conveyor belt (207) with holes is wound around the active roller (201), the driven roller (202), the deviation adjustment mechanism (206), the second redirecting roller (205), the tensioning roller (204) and the first redirecting roller (203); A plurality of first supporting rollers (208) are arranged between the active roller (201) and the driven roller (202), and the upper surfaces of the active roller (201), the driven roller (202) and the first supporting roller (208) are tangent to the same horizontal plane; a plurality of second supporting rollers (209) are arranged between the second redirecting roller (205) and the deviation adjustment mechanism (206), and the upper surfaces of the second redirecting roller (205), the deviation adjustment mechanism (206) and the second supporting rollers (209) are tangent to the same horizontal plane.

3. The drying and conveying system for biomass fuel according to claim 2, characterized in that: A material turner (9) is arranged above the conveyor belt (207), and the material turner (9) includes a third motor (901). The third motor (901) is fixed on the side wall of the drying box (1), and the output end of the third motor (901) is provided with a plurality of material turners (902) arranged along the circumferential direction.

4. The drying and conveying system for biomass fuel according to claim 2, characterized in that: A mesh belt cleaning device (10) is arranged on the left side of the deflection adjustment mechanism (206), and the mesh belt cleaning device (10) comprises a water pipe (1001) connected to an external water source, and the water pipe (1001) is connected to the inner wall of the drying box (1) through a hanging assembly (1002), and a plurality of high-pressure nozzles (1003) are arranged on the water pipe (1001), and the water outlet of the high-pressure nozzle (1003) faces the inner surface of the conveyor belt (207).

5. The drying and conveying system for biomass fuel according to claim 2, characterized in that: A lifting device (8) is provided at the bottom end of the feed box (701); the lifting device (8) comprises a first lifter (801), a second lifter (802), a third lifter (803) and a fourth lifter (804); the telescopic ends of the first lifter (801), the second lifter (802), the third lifter (803) and the fourth lifter (804) are connected to the bottom of the feed box (701); the bottom ends of the first lifter (801), the second lifter (802), the third lifter (803) and the fourth lifter (804) are all provided with support columns (8010); the support columns (8010) are fixed on the drying box (1).

6. The drying and conveying system for biomass fuel according to claim 5, characterized in that: The first lifter (801), the second lifter (802), the third lifter (803) and the fourth lifter (804) are all worm gear lifters; The worm gears of the first lifter (801) and the second lifter (802) are connected via a first chain assembly (805); a connecting rod (806) is provided between the second lifter (802) and the third lifter (803); couplings (807) are provided at both ends of the connecting rod (806); the two couplings (807) are respectively connected to the worm gears of the second lifter (802) and the third lifter (803); and the worm gears of the third lifter (803) and the fourth lifter (804) are connected via a second chain assembly (808).

7. The drying and conveying system for biomass fuel according to claim 6, characterized in that: A Z-shaped rotating handle (809) is provided at the left end of the worm of the first lifter (801).

8. The drying and conveying system for biomass fuel according to claim 1, characterized in that: An air guide plate (11) is arranged above the conveying device (2), the four sides of the air guide plate (11) are sealedly connected to the inner wall of the drying box (1), and the space above the air guide plate (11) is an air guide chamber (12); The air guide plate (11) is provided with a grille plate (13) on a side away from the negative pressure fan (5), and the air guide chamber (12) is connected to the space below the air guide plate (11) through the grille plate (13).

9. The drying and conveying system for biomass fuel according to claim 8, characterized in that: The air inlet (101) is arranged on the top plate of the drying box (1) at a side away from the grille plate (13), and the air guide plate (11) is a U-shaped structure.

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