A biomass pellet fuel dryer

Abstract

The present application relates to dryer technical field, especially for a kind of biomass pellet fuel dryer, including rack and the drying oven and conveying device being set in the side of rack;The rack is closed box structure, its inside is divided into two independent sealed space by partition, second fan is provided on the partition, the second fan can be when starting gas in upper sealed space is pumped to lower sealed space;Combustion furnace and heat conducting device are provided in the lower sealed space, the combustion furnace is used to burn biomass pellet fuel to generate heat, the heat conducting device is used to emit the heat generated by the combustion furnace;Conveying device is used to convey biomass pellet fuel into the combustion furnace;The drying oven includes box and several horizontal setting shelves, several the shelf is equidistantly arranged in the inside of the box along vertical direction.The present application realizes the repeated multiple use of heat energy, reduces actual drying cost.

Description

Technical Field

[0001] This invention relates to the field of dryer technology, specifically to a biomass pellet fuel dryer. Background Technology

[0002] A dryer is a mechanical device that dries moisture or other liquids from the surface of an object using certain technical means. A biomass pellet fuel dryer is a drying device that generates heat energy by burning biomass pellet fuel. For example, Chinese patent document CN204722215U discloses a novel edible mushroom dryer, including a housing. The housing includes an edible mushroom placement area and a heat energy generation area for converting cold air inside the housing into hot air. The heat energy generation area is equipped with a combustion device for generating heat energy and a drying device for evaporating heat energy and converting surrounding cold air into hot air. The drying device includes a placement area for placing the combustion furnace.

[0003] Although the aforementioned patent documents have solved problems such as excessive sulfur dioxide, they still have the following shortcomings in actual use: the heat energy generated by burning biomass pellet fuel can only be used once and cannot be recycled, resulting in a waste of heat energy resources and requiring the combustion of a large amount of biomass pellet fuel, which increases its usage cost. Summary of the Invention

[0004] The purpose of this invention is to provide a biomass pellet fuel dryer to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A biomass pellet fuel dryer includes a frame, a drying oven disposed beside the frame, and a conveying device;

[0007] The frame is a closed box structure, which is divided into two independent sealed spaces, upper and lower, by a partition. A second fan is installed on the partition. When the second fan is started, it can draw the gas in the upper sealed space to the lower sealed space.

[0008] The lower sealed space is equipped with a combustion furnace and a heat conduction device. The combustion furnace is used to burn biomass pellet fuel to generate heat, and the heat conduction device is used to dissipate the heat generated by the combustion furnace.

[0009] The conveying device is used to transport biomass pellet fuel to the combustion furnace;

[0010] The oven includes a box body and several horizontally arranged shelves, which are equidistantly arranged inside the box body along the vertical direction;

[0011] The cabinet is a sealed structure with a vent at the top, and a vent cover is provided on the top of the cabinet for opening and closing the vent.

[0012] The top and bottom sides of the housing are connected to the upper and lower sealing spaces through a first air inlet and a second air inlet, respectively. A first sealing door for controlling the opening and closing of the first air inlet is provided, and a second sealing door for controlling the opening and closing of the second air inlet is provided.

[0013] Preferably, the plurality of shelves form a Z-shaped channel inside the housing, and the plurality of shelves are arranged in pairs, with the two shelves in the same pair being able to move relative to each other, so that the airflow direction above each shelf can change periodically.

[0014] Preferably, the enclosure includes two oppositely arranged side panels, a back panel perpendicular to the side panels, and a door disposed on the side of the side panels opposite to the back panel. When the door is closed, the back panel, the side panels, and the door together form a vertical rectangular cylindrical structure, and the dehumidification cover is disposed on the top of the rectangular cylindrical structure.

[0015] A conversion device is provided between the two shelves in the same group to drive the two shelves in the same group to move relative to each other.

[0016] Preferably, the conversion device includes a second gear and a second rack and a third rack respectively meshing on the upper and lower sides of the second gear;

[0017] The second rack and the third rack are respectively fixed with sliders, the sliders are slidably mounted on a horizontal slide rail, and the slide rail is mounted on the side plate;

[0018] The second gear is fixed on the intermediate shaft, which is rotatably mounted on the side plate;

[0019] The side plate is equipped with a drive device for rotating the intermediate shaft.

[0020] Preferably, the side plate includes a first plate, a second plate, and a third plate fixed to the ends of the first plate and the second plate, with a middle spacer layer formed between the first plate, the second plate, and the two third plates.

[0021] The drive device is located inside the intermediate partition and includes a cylinder and a first rack and a first gear that mesh with each other. The first rack is fixedly connected to the piston rod end of the cylinder through a connecting plate, and the first gear is coaxially fixed on the intermediate shaft.

[0022] Preferably, a U-shaped seat is fixedly provided on the slider, and a limit hole is provided at the bottom of the end of the U-shaped seat near the door;

[0023] A limit block is provided at the bottom of the end of the shelf near the door.

[0024] Preferably, a guide device is provided between two adjacent shelves. The guide device includes at least two support rods. Air guide vanes are rotatably provided on the support rods through sleeves. A gap is formed between two adjacent air guide vanes on the same support rod.

[0025] The air ducts on two adjacent support rods are staggered.

[0026] Preferably, the support rod includes a rod body, with vertical portions fixed at both ends of the rod body, and a fixing portion fixed at the bottom end of the vertical portion, the fixing portion being installed on the inner wall of the oven.

[0027] Preferably, the combustion furnace includes a furnace chamber, a lower ash box, and a first blower. The lower ash box is located at the bottom of the furnace chamber, the first blower is installed on the lower ash box, and a conveying device is used to convey biomass pellet fuel into the furnace chamber. The outer surface of the furnace chamber is provided with fins.

[0028] Preferably, the heat conduction device includes a first heat conduction box, a second heat conduction box, a third heat conduction box, and a flue gas outlet. The first heat conduction box is connected to the furnace. Heat dissipation fins are connected between the first heat conduction box and the second heat conduction box, and between the second heat conduction box and the third heat conduction box. The flue gas outlet is connected to the third heat conduction box.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1. In this invention, the heat energy generated by combustion in the furnace can circulate between the frame and the oven, thereby realizing the repeated use of heat energy and reducing the actual drying cost; at the same time, with the help of related structures, the moisture inside the circulating airflow can be discharged when it is too heavy.

[0031] 2. In this invention, the two shelves in the same group can move relative to each other, which can cause the airflow direction above each shelf to change periodically. For example, in the first three minutes, the airflow direction above a certain shelf is from right to left. Then, after the two shelves in the same group move relative to each other, the airflow direction above that shelf will change to from left to right. The advantage of this setting is that the material can be swept by hot airflow from multiple directions to ensure uniform heating of the material and prevent the material from overheating on one side. In general, the hot airflow can sweep and absorb moisture from the material in multiple directions, which can improve the dehumidification speed and prevent local overheating of the material. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the combustion furnace and heat conduction device of the present invention;

[0034] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0035] Figure 4 This is a schematic diagram of the structure of the oven of the present invention;

[0036] Figure 5 This is a schematic diagram of the positional structure of the driving device of the present invention;

[0037] Figure 6 This is a schematic diagram showing the position and structure of the guiding device of the present invention;

[0038] Figure 7 This is a schematic diagram of the conversion device and U-shaped base of the present invention;

[0039] Figure 8 This is a schematic diagram of the structure of the driving device and the conversion device of the present invention;

[0040] Figure 9 This is a schematic diagram of the guiding device of the present invention;

[0041] Figure 10 This is a side view of the structure of multiple shelves in this invention;

[0042] Figure 11 This is a schematic diagram of the structure of the storage rack of the present invention;

[0043] Figure 12 This is a schematic diagram of the structure of the limiting block of the present invention.

[0044] In the diagram: 1. Frame; 11. Partition; 2. Oven; 21. Back plate; 22. Side plate; 221. First plate; 222. Second plate; 223. Middle partition; 224. Third plate; 23. Door; 24. Shelf; 241. Limiting block; 25. First air vent; 26. First sealing door; 27. Second air vent; 28. Second sealing door; 29. ​​Exhaust cover; 291. Electric push rod; 3. Conveying device; 4. Combustion furnace; 41. Furnace chamber; 42. Ash box; 43. First fan; 44. Fin; 5. Heat conduction device; 51. First heat conduction box; 52. Second heat conduction box; 53. Third heat conduction box; 54. Heat dissipation fins; 55. Flue gas outlet; 6. Second fan; 7. Drive device; 71. First rack; 72. First gear; 73. Cylinder; 74. Connecting plate; 8. Conversion device; 81. Second gear; 82. Second rack; 83. Third rack; 84. Intermediate shaft; 85. Slide rail; 86. Slider; 9. Guide device; 91. Support rod; 911. Rod body; 912. Vertical part; 913. Fixing part; 92. Air duct; 93. Sleeve; 94. Gap; 10. U-shaped seat; 101. Limiting hole. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Please see Figures 1-12 The present invention provides a technical solution:

[0047] A biomass pellet fuel dryer includes a frame 1, a drying oven 2 disposed beside the frame 1, and a conveying device 3. The frame 1 can be a basic frame structure formed by welding square tubing, and then plates are installed on this frame structure, making the entire frame 1 a closed box structure. Further, the frame 1 can be a rectangular box shape.

[0048] The interior of the frame 1 is divided into two independent sealed spaces, upper and lower, by a partition 11. A second fan 6 is installed on the partition 11. When the second fan 6 is started, it can draw the gas in the upper sealed space to the lower sealed space. The specific model of the second fan 6 is not limited here. For example, the model of the second fan 6 can be the PYJ-47 fan from Shandong Rongwen Ventilation Equipment Co., Ltd.

[0049] A combustion furnace 4 and a heat conduction device 5 are installed in the lower sealed space. The conveying device 3 is used to transport biomass pellet fuel to the combustion furnace 4. The combustion furnace 4 is used to burn biomass pellet fuel to generate heat. The heat conduction device 5 is used to dissipate the heat generated by the combustion furnace 4. The airflow blown out by the second fan 6 flows over the surface of the heat conduction device 5, taking away the heat on it. Then the airflow that absorbs the heat enters from the bottom of the drying oven 2 and gradually rises inside the drying oven 2 to realize the drying operation of the material.

[0050] The combustion furnace 4 includes a furnace chamber 41, a lower ash box 42, and a first blower 43. The lower ash box 42 is located at the bottom of the furnace chamber 41, and the first blower 43 is installed on the lower ash box 42. The conveying device 3 is used to convey biomass pellet fuel into the furnace chamber 41. The residue produced by combustion is collected in the lower ash box 42. The outer surface of the furnace chamber 41 is provided with fins 44, which are used to increase the heat dissipation area of ​​the furnace chamber 41. In this embodiment, the conveying device 3 can be a screw conveyor, which conveys biomass pellet fuel into the interior of the furnace chamber 41 through screw blades.

[0051] The heat conduction device 5 includes a first heat conduction box 51, a second heat conduction box 52, a third heat conduction box 53, and a flue gas outlet 55. The first heat conduction box 51 is connected to the furnace 41. Heat dissipation fins 54 are connected between the first heat conduction box 51 and the second heat conduction box 52, and between the second heat conduction box 52 and the third heat conduction box 53. Multiple heat dissipation fins 54 are provided, and each heat dissipation fin 54 includes a tube body and annular heat dissipation fins surrounding the tube body, thereby increasing the heat dissipation area. The flue gas outlet 55 is connected to the third heat conduction box 53.

[0052] The oven 2 includes a box body and several horizontally arranged shelves 24. Materials are placed on the shelves 24. The shelves 24 are arranged equidistantly in the vertical direction inside the box body. That is, in the vertical direction, the distance between two adjacent shelves 24 is equal.

[0053] The oven 2 has a sealed structure with a vent at the top, and a vent cover 29 is provided on the top of the oven for opening and closing the vent. In this embodiment, the vent cover 29 is the cover structure on the top of the oven. When the vent cover 29 is open, the humid gas inside the oven 2 can be discharged through the vent. When the vent cover 29 is closed, the gas inside the oven 2 can circulate between the oven 2 and the frame 1 (the specific circulation method is described in detail below), reducing heat loss and lowering the overall energy consumption of the dryer. The most direct benefit is reducing the amount of biomass pellet fuel burned in the combustion furnace 4, thus reducing costs. In this embodiment, the vent cover 29 is hinged to the top of the oven, and the opening and closing of the vent cover 29 is achieved by an electric push rod 291.

[0054] Furthermore, the oven 2 is equipped with a temperature sensor and a humidity sensor, both of which are electrically connected to the control panel. In this embodiment, the temperature sensor and humidity sensor can be installed on the lower surface of the exhaust cover 29 to detect the temperature and humidity of the gas rising to the top of the oven 2. The detection results are fed back to the control panel to monitor the drying environment in real time and ensure that the drying process is carried out under optimal conditions. When the humidity sensor detects that the airflow humidity is too high, the control panel will drive the electric push rod 291 to open the exhaust cover 29, thereby realizing the moisture discharge operation.

[0055] The top and bottom sides of the housing are connected to the upper and lower sealed spaces via a first air inlet 25 and a second air inlet 27, respectively. A first sealing door 26 for controlling the opening and closing of the first air inlet 25 is provided, and a second sealing door 28 for controlling the opening and closing of the second air inlet 27 is provided. Both the first sealing door 26 and the second sealing door 28 can be electrically driven and their opening and closing states are controlled by a control panel. Furthermore, the degree of opening of the first sealing door 26 and the second sealing door 28 can also be controlled by the control panel.

[0056] Furthermore, the top plate of rack 1 is also a structure that can be opened and closed, and its opening and closing are controlled by a control panel.

[0057] The specific circulation flow method is as follows: The control panel controls the vent cover 29 to close and controls the first sealing door 26 and the second sealing door 28 to open. Then, the control panel starts the second fan 6. At this time, since the first air guide port 25 is connected to the upper sealed space and the second air guide port 27 is connected to the lower sealed space, the airflow can circulate inside the frame 1 and the oven 2. Since the combustion furnace 4 and the heat conduction device 5 are located in the lower sealed space, the gas can also be circulated and heated during the gas circulation process to ensure that the gas is at the optimal drying temperature. During this process, temperature and humidity sensors can detect the temperature and humidity of the circulating gas. When the internal humidity of the gas is too high, the control panel controls the closing of the first sealing door 26, the opening of the exhaust cover 29, and the opening of the top plate of the frame 1. At this time, the second fan 6 can draw dry gas from the external environment into the interior of the frame 1 and exhaust the humid gas inside the oven 2. After dehumidification is completed, the exhaust cover 29 and the top plate of the frame 1 are closed again, and the first sealing door 26 is opened, so that the dry gas can circulate inside the frame 1 and the oven 2.

[0058] Several shelves 24 form a Z-shaped channel inside the housing, and the shelves 24 are arranged in pairs. The two shelves 24 in the same pair can move relative to each other. This relative movement means that when one shelf 24 moves to the left, the other shelf 24 moves to the right simultaneously. This allows the airflow direction above each shelf 24 to change periodically. This periodic change refers to the periodic alteration of the airflow direction above the shelf 24. For example, if the airflow direction above a shelf 24 is from right to left in the first three minutes, then after the relative movement of the two shelves 24 in the same pair, the airflow direction above that shelf 24 will change to from left to right. The advantage of this arrangement is that the material can be swept by hot airflow from multiple directions, ensuring uniform heating and preventing overheating on one side. In general, the hot airflow can sweep and absorb moisture from the material in multiple directions, which can improve the dehumidification speed and prevent localized overheating. The achieved effect is:

[0059] Improving drying efficiency and accelerating moisture evaporation: When the material surface is in uniform contact with the drying hot air, the hot air can continuously and stably remove moisture from the material surface. The increased contact area between the hot air and the material surface, along with the good contact condition, allows the rate at which moisture migrates from the material's interior to the surface to match the rate at which it evaporates from the surface into the hot air, thereby accelerating the entire drying process.

[0060] Shorten the drying cycle: Uniform contact means that all parts of the material can be heated simultaneously, avoiding the situation where some materials dry slowly due to insufficient heat contact. This reduces the overall drying time, improves production efficiency, and meets the needs of large-scale production.

[0061] To ensure drying quality and avoid localized overheating or overdrying: If the material surface does not contact the hot air evenly, some areas may become too hot due to concentrated heat, leading to over-drying or even charring of the material surface, while other areas may be under-dried. Uniform contact ensures that the temperature and dryness of all parts of the material are relatively consistent, avoiding localized quality problems;

[0062] Reducing material deformation and cracking: Uneven drying can create stress differences within the material. When this stress exceeds the material's tolerance, it can lead to deformation or cracking. Uniform contact allows for even evaporation of moisture from the material, reducing stress concentration and thus lowering the risk of deformation and cracking.

[0063] The oven 2 includes two opposing side panels 22, a back panel 21 perpendicular to the side panels 22, and a door 23 on the other side of the side panels 22 opposite to the back panel 21. The door 23 can be opened and closed. When the door 23 is open, the operator can put a rack 24 containing materials into it, or the operator can take the dried materials out of the oven 2. When the door 23 is closed, the back panel 21, side panels 22 and door 23 together form a vertical rectangular cylindrical structure. The bottom of the rectangular cylindrical structure is sealed, and a dehumidification cover 29 is set on the top of the rectangular cylindrical structure.

[0064] A conversion device 8 is provided between two shelves 24 in the same group to drive the two shelves 24 in the same group to move relative to each other. Specifically, the conversion device 8 includes a second gear 81 and a second rack 82 and a third rack 83 respectively meshing on the upper and lower sides of the second gear 81. A slider 86 is fixed on the second rack 82 and the third rack 83 respectively. The slider 86 is slidably mounted on a horizontal slide rail 85. The slide rail 85 can be bolted to the side plate 22. When the second gear 81 rotates, the second rack 82 and the third rack 83 can move linearly in opposite directions. For example, when the second rack 82 moves to the left, the third rack 83 moves to the right.

[0065] The second gear 81 is fixed on the intermediate shaft 84, which is rotatably mounted on the side plate 22 via a sealed bearing or other structure; the side plate 22 is equipped with a drive device 7 for driving the intermediate shaft 84 to rotate.

[0066] The side plate 22 includes a first plate 221, a second plate 222 arranged in parallel, and a third plate 224 fixed to the ends of the first plate 221 and the second plate 222. A middle partition layer 223 is formed between the first plate 221, the second plate 222 and the two third plates 224. That is, the side plate 22 is a hollow plate structure as a whole, and the driving device 7 is arranged inside the side plate 22.

[0067] The drive device 7 includes a cylinder 73 and a first rack 71 and a first gear 72 that mesh with each other. The first rack 71 is fixedly connected to the piston rod end of the cylinder 73 through a connecting plate 74, so that the extension and retraction of the piston rod of the cylinder 73 can drive the first rack 71 to move linearly together. The first gear 72 is coaxially fixed on the intermediate shaft 84. When the first rack 71 moves linearly, due to the meshing relationship between the first rack 71 and the first gear 72, the first gear 72 will start to rotate, thereby driving the second gear 81 to rotate synchronously through the intermediate shaft 84.

[0068] To facilitate the installation and disassembly of the shelving unit 24, the following structure is provided:

[0069] A U-shaped seat 10 is fixedly installed on the slider 86. The two ends of the shelf 24 are inserted into the two U-shaped seats 10, thereby supporting and limiting the shelf 24. A limiting hole 101 is opened at the bottom of the end of the U-shaped seat 10 near the door 23. A limiting block 241 is provided at the bottom of the end of the shelf 24 near the door 23. When the shelf 24 is inserted into the U-shaped seat 10 from front to back, the shelf 24 can be judged to be inserted into the limiting hole 101 by whether the limiting block 241 is inserted into the limiting hole 101. At the same time, the limiting block 241 and the limiting hole 101 can also prevent the shelf 24 from shifting during the movement of the shelf 24.

[0070] To further increase the contact area between the hot airflow and the material, a guide device 9 is provided between two adjacent shelves 24. The guide device 9 includes at least two support rods 91, and air guide vanes 92 are rotatably mounted on the support rods 91 via sleeves 93. A gap 94 is formed between two adjacent air guide vanes 92 on the same support rod 91. In actual use, as the hot airflow flows above the shelf 24, the air guide vanes 92 will tilt to a certain extent, which can change the flow direction of the hot airflow, causing it to be blown into the gap of the material in an inclined downward manner, thereby increasing the contact area with the material. At the same time, it can also cause the hot airflow between two adjacent shelves 24 to tumble, so that the hot airflow that has absorbed moisture can quickly mix with the hot airflow that has not absorbed moisture, reducing the humidity inside the gas per unit volume, making it easier for the gas to absorb more moisture from the material and accelerating the drying speed of the material. Furthermore, since the air guide vanes 92 on the two adjacent support rods 91 are staggered, the hot airflow passing through the gap 94 can be guided by the air guide vanes 92 on the next guide device 9 to sweep the material in another area obliquely downward.

[0071] Furthermore, the support rod 91 includes a rod body 911, with vertical parts 912 fixed at both ends of the rod body 911, and a fixing part 913 fixed at the bottom end of the vertical part 912. The fixing part 913 is installed on the inner wall of the drying oven 2. The purpose of this arrangement is to increase the height of the rod body 911 for feeding without affecting the movement of the second rack 82 and the third rack 83, thereby increasing the area of ​​the air guide vane 92 to guide and redirect the hot airflow to the greatest extent. Then, combined with the periodic change of the hot airflow direction above each shelf 24, the hot airflow can blow and dry each material in multiple directions, resulting in good uniformity and high efficiency.

[0072] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A biomass pellet fuel dryer, characterized in that, Includes a frame, an oven located beside the frame, and a conveying device; The frame is a closed box structure, which is divided into two independent sealed spaces, upper and lower, by a partition. A second fan is installed on the partition. When the second fan is started, it can draw the gas in the upper sealed space to the lower sealed space. The lower sealed space is equipped with a combustion furnace and a heat conduction device. The combustion furnace is used to burn biomass pellet fuel to generate heat, and the heat conduction device is used to dissipate the heat generated by the combustion furnace. The conveying device is used to transport biomass pellet fuel to the combustion furnace; The oven includes a box body and several horizontally arranged shelves, which are equidistantly arranged inside the box body along the vertical direction; The cabinet is a sealed structure with a vent at the top, and a vent cover is provided on the top of the cabinet for opening and closing the vent. The top and bottom sides of the housing are connected to the upper and lower sealed spaces through the first and second air inlets, respectively. A first sealing door for controlling the opening and closing of the first air inlet is provided at the position of the first air inlet, and a second sealing door for controlling the opening and closing of the second air inlet is provided at the position of the second air inlet. The shelves form a Z-shaped channel inside the box, and the shelves are arranged in pairs. The two shelves in the same pair can move relative to each other, so that the airflow direction above each shelf can change periodically. The enclosure includes two oppositely arranged side panels, a back panel perpendicular to the side panels, and a door located on the other side of the side panels opposite to the back panel. When the door is closed, the back panel, the side panels, and the door together form a vertical rectangular cylindrical structure, and the dehumidification cover is located on the top of the rectangular cylindrical structure. A conversion device is provided between two shelves in the same group to drive the two shelves in the same group to move relative to each other; The conversion device includes a second gear and a second rack and a third rack respectively meshing on the upper and lower sides of the second gear; The second rack and the third rack are respectively fixed with sliders, the sliders are slidably mounted on a horizontal slide rail, and the slide rail is mounted on the side plate; The second gear is fixed on the intermediate shaft, which is rotatably mounted on the side plate; The side plate is equipped with a drive device for rotating the intermediate shaft.

2. The biomass pellet fuel dryer according to claim 1, characterized in that, The side plate includes a first plate, a second plate, and a third plate fixed to the ends of the first plate and the second plate, with a middle partition layer formed between the first plate, the second plate, and the two third plates. The drive device is located inside the intermediate partition and includes a cylinder and a first rack and a first gear that mesh with each other. The first rack is fixedly connected to the piston rod end of the cylinder through a connecting plate, and the first gear is coaxially fixed on the intermediate shaft.

3. A biomass pellet fuel dryer according to claim 1, characterized in that, A U-shaped seat is fixedly provided on the slider, and a limit hole is opened at the bottom of the end of the U-shaped seat near the door; A limit block is provided at the bottom of the end of the shelf near the door.

4. A biomass pellet fuel dryer according to claim 1, characterized in that, A guide device is provided between two adjacent shelves. The guide device includes at least two support rods. Air guide vanes are rotatably mounted on the support rods via sleeves. A gap is formed between two adjacent air guide vanes on the same support rod. The air ducts on two adjacent support rods are staggered.

5. A biomass pellet fuel dryer according to claim 4, characterized in that, The support rod includes a rod body, with vertical parts fixed at both ends of the rod body. A fixing part is fixed at the bottom end of the vertical part, and the fixing part is installed on the inner wall of the oven.

6. A biomass pellet fuel dryer according to claim 1, characterized in that, The combustion furnace includes a furnace chamber, a lower ash box, and a first blower. The lower ash box is located at the bottom of the furnace chamber, and the first blower is installed on the lower ash box. A conveying device is used to convey biomass pellet fuel into the furnace chamber, and fins are provided on the outer surface of the furnace chamber.

7. A biomass pellet fuel dryer according to claim 6, characterized in that, The heat conduction device includes a first heat conduction box, a second heat conduction box, a third heat conduction box, and a flue gas outlet. The first heat conduction box is connected to the furnace. Heat dissipation fins are connected between the first heat conduction box and the second heat conduction box, and between the second heat conduction box and the third heat conduction box. The flue gas outlet is connected to the third heat conduction box.

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