Wood chip conveying device for biomass pellet fuel production

Abstract

The present invention relates to the technical field of biomass pellet fuel production equipment, and specifically to a wood chip conveying device for biomass pellet fuel production, comprising a conveying shell, spiral blades, a rotating shaft, a rotating power source, a heating pipe, a condensing cover, a condensing pipe, and a wiper mechanism. The present invention integrates the drying function into the wood chip conveying process, eliminating the need for additional drying equipment, effectively reducing the equipment purchase and installation costs, and reducing the site space occupied. At the same time, it avoids unnecessary costs caused by the need to pass through the drying equipment when the moisture content of the raw wood chips is low, significantly improving production efficiency; the conveying shell and the internal wood chips are heated by the heating pipe, and the condensing cover is used to reduce heat loss, the condensing pipe quickly condenses water, and the wiper mechanism promptly removes condensed water, so that the interior of the conveying shell maintains a high-temperature dry environment, achieving efficient drying of the wood chips, ensuring the dryness of the wood chips, and providing high-quality raw materials for the subsequent pelletizing process.

Description

Technical Field

[0001] The present invention relates to the technical field of biomass pellet fuel production equipment, in particular to a sawdust conveying device for biomass pellet fuel production. Background Art

[0002] In the production process of biomass pellet fuel, the raw materials need to undergo crushing and secondary fine powder in sequence, and finally become wood chips. They are then transported to the feeding buffer bin of the pelletizing equipment through an auger conveying equipment for pelletizing.

[0003] When the moisture content of sawdust is high, to meet pelletizing requirements, a drying device must be added between the auger conveyor and the pelletizer to dry the sawdust. However, this solution has many drawbacks: on the one hand, the additional drying equipment significantly increases the purchase and installation costs of the equipment and takes up more site space; on the other hand, when the raw sawdust has a low moisture content and does not require drying, it still needs to flow through the drying device before reaching the pelletizer, which not only increases production costs but also seriously reduces production efficiency.

[0004] It can be seen that the development of a conveying device that does not require additional drying equipment and can achieve sawdust drying during the conveying process is of great significance to optimizing the biomass pellet fuel production process, reducing costs and improving efficiency. Summary of the Invention

[0005] The present invention aims to provide a sawdust conveying device for biomass pellet fuel production, which integrates a drying function into the conveying process, effectively solving the problems of high cost, low efficiency, and large space occupation caused by the addition of drying equipment in the prior art, and realizes efficient drying of sawdust during the conveying process, providing high-quality raw materials for the subsequent pelletizing process, and improving the overall efficiency of biomass pellet fuel production.

[0006] The technical problem solved by the present invention is achieved by the following technical solution: The wood chip conveying device for biomass pellet fuel production of the present invention is mainly composed of core components such as a conveying shell, spiral blades, a rotating shaft, and a rotating power source.

[0007] The conveying housing is provided with a feed inlet and a discharge outlet at each end. The feed inlet receives the crushed and finely pulverized sawdust, while the discharge outlet delivers the dried sawdust to the pelletizing equipment's feed buffer bin. A rotating shaft is rotatably connected to the conveying housing, providing support for the rotation of the spiral blades. The spiral blades are fixedly mounted on the rotating shaft and positioned within and adapted to the conveying housing. Driven by a rotary power source, the rotation of the spiral blades propels the sawdust within the conveying housing from the feed inlet to the discharge outlet, achieving stable conveying of the sawdust.

[0008] By circulating the heat medium in the heating pipe, the wood chips in the conveying shell can be heated, thereby evaporating the moisture in the wood chips and achieving the drying function. A condensation cover is fixed on the top of the conveying shell. The condensation cover closes the opening at the top of the conveying shell, greatly reducing the connection area between the conveying shell and the outside world, effectively reducing heat loss, and allowing the inside of the conveying shell to maintain a high temperature, creating good environmental conditions for wood chip drying. In addition, a condensation pipe for introducing refrigerant is installed on the upper end face of the condensation cover. When the refrigerant flows in the condensation pipe, it can cool the condensation cover, prompting the moisture generated by the evaporation of the wood chips to condense quickly, ensuring that the air inside the conveying shell is in a high-temperature dry state, further improving the drying efficiency and effect.

[0009] In order to promptly remove the condensed water on the condensation cover, the device is also provided with a wiper mechanism. The wiper mechanism mainly includes a wiper trough and a linear drive device. The linear drive device can drive the wiper trough to move left and right in the conveying shell. When the wiper trough moves to the left, it will tilt to the left, and its left top end will rotate upward as a wiper end and contact the lower end surface of the condensation cover to scrape and collect the condensed water on the lower end surface of the condensation cover; when the wiper trough moves to the right, it will tilt to the right, and the right top end will contact the lower end surface of the condensation cover as a wiper end to scrape and collect the condensed water on the lower end surface of the condensation cover. The collected condensed water is discharged out of the conveying shell through a drain pipe fixedly installed on the end of the wiper trough near the feed port, ensuring that the air inside the conveying shell always remains dry, avoiding the condensed water and sawdust from mixing again, which affects the drying effect.

[0010] Furthermore, the wiper mechanism also includes an insert rod, a push rod and multiple swing components. The swing component consists of a guide rod, a slider, a hinge seat and a swing plate. The guide rod is fixedly installed in the conveying shell, and its length direction is parallel to the width direction of the condensation cover plate, providing guidance for the sliding of the slider; the slider is slidably connected to the guide rod, and the upper end of the slider is fixedly connected to the hinge seat; the lower end of the swing plate is hinged to the hinge seat, and the upper end is fixedly connected to the wiper groove; a circular hole is opened on the swing plate, and the outer diameter of the insert rod is smaller than the aperture of the circular hole. The insert rod is inserted into the circular hole and can move left and right in the circular hole. The linear drive device is fixedly connected to the conveying shell, and its output end is connected to the push rod, which is connected to the insert rod. The linear drive device drives the insert rod to move left and right in the conveying shell through the push rod. When the linear drive device drives the push rod to move to the left, the insertion rod contacts the inner arc surface on the left side of the circular hole, causing the swing plate to tilt to the left, driving the left top end of the wiper trough to contact the lower end surface of the condensation cover; when the drive push rod moves to the right, the insertion rod contacts the inner arc surface on the right side of the circular hole, causing the swing plate to tilt to the right, and the right top end of the wiper trough contacts the lower end surface of the condensation cover, thereby realizing that the wiper trough can fully scrape off the condensed water on the condensation cover.

[0011] In addition, the wiper mechanism is further provided with a mounting bracket, which is fixedly connected to the conveying housing and is used for mounting the linear drive device to ensure the working stability of the linear drive device.

[0012] An insulation shell is fixed to the outer wall of the conveying shell, and a heat insulation cavity is formed between the insulation shell and the conveying shell. The heating pipe is located in the heat insulation cavity, and its input end and output end both extend out of the heat insulation cavity, reducing heat loss from the heating pipe and improving heating efficiency; an insulation cover is fixed to the upper end of the condensing cover plate, and a cold insulation cavity is formed between the insulation cover and the condensing cover plate. The condensing pipe is located in the cold insulation cavity, and its input end and output end both extend out of the cold insulation cavity, reducing cold loss from the condensing pipe and improving condensation effect.

[0013] A bracket is fixed to the lower end of the insulation shell, and a universal wheel with a brake is installed at the lower end of the bracket to facilitate the movement of the device. The bracket is high at one end and low at the other end, which can keep the conveying shell in an inclined state, so that the height of the feed port is lower than that of the discharge port, making it easier to transport wood chips to higher places.

[0014] The rotating shaft is a hollow shaft with a through-hole for introducing heat medium. Rotary joints are installed at both ends of the rotating shaft. By introducing heat medium into the rotating shaft, the spiral blades and wood chips can be further heated, improving the heating effect and uniformity. A sealing and thermal insulation pad is installed between the conveying housing and the condensing cover. Multiple lower lugs are fixed to the conveying housing, and multiple upper lugs are fixed to the condensing cover. The upper lugs correspond to the lower lugs one-to-one and are fixed together by a bolt assembly, which not only ensures the sealing of the device but also facilitates installation and removal.

[0015] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0016] 1. Integrated drying function reduces costs: The present invention integrates the drying function into the sawdust conveying process, eliminating the need for additional drying equipment. This effectively reduces equipment purchase and installation costs, reduces site space occupation, and avoids unnecessary costs incurred by drying sawdust when the moisture content is low, significantly improving production efficiency.

[0017] 2. Efficient drying to ensure quality: The conveying shell and the internal wood chips are heated through the heating pipe, and the condensation cover is used to reduce heat loss, the condensation pipe quickly condenses water, and the wiper mechanism removes condensed water in time, so that the inside of the conveying shell maintains a high-temperature dry environment, achieving efficient drying of the wood chips and ensuring the dryness of the wood chips, providing high-quality raw materials for the subsequent pelletizing process, and improving the production quality of biomass pellet fuel;

[0018] 3. Ingenious structure and stable operation: The swing component of the wiper mechanism is cleverly designed. Through the cooperation of the plug rod, push rod and the round hole on the swing plate, the scraper groove can be flexibly tilted left and right to ensure the comprehensive scraping of condensed water on the condensing cover plate; the insulation shell and insulation cover respectively play a good insulation role for the heating pipe and the condensing pipe, reducing the loss of heat and cold; the rotating shaft adopts a hollow shaft and passes heat medium to further improve the heating effect and uniformity; the sealing insulation pad and bolt assembly connection between the conveying shell and the condensing cover plate ensure the sealing of the device and the convenience of installation and disassembly, making the entire device stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 An exploded view of a sawdust conveying device for biomass pellet fuel production provided in an embodiment of the present application;

[0021] Figure 2 A perspective view of a sawdust conveying device for biomass pellet fuel production provided in an embodiment of the present application;

[0022] Figure 3 A top view of a sawdust conveying device for biomass pellet fuel production provided in an embodiment of the present application;

[0023] Figure 4 A partial schematic diagram of a sawdust conveying device for biomass pellet fuel production provided in an embodiment of the present application (the bracket is not shown);

[0024] Figure 5 for Figure 1 A partial enlarged view of point A in the middle;

[0025] Figure 6 for Figure 4 Cross-sectional view along line BB;

[0026] Figure 7 for Figure 6 A partial enlarged view of point C in the middle (the rod moves to the right and contacts the inner arc surface on the right side of the circular hole);

[0027] Figure 8 for Figure 7 Another state diagram (the rod changes from moving to the right and contacting the inner arc surface on the right side of the circular hole to moving to the left and contacting the inner arc surface on the left side of the circular hole);

[0028] In the figure, 1. conveying shell; 2. spiral blade; 3. rotating shaft; 4. rotating power source; 5. feed port; 6. discharge port; 7. heating pipe; 8. condensation cover; 9. condensation pipe; 10. scraper trough; 11. linear drive device; 12. insertion rod; 13. guide rod; 14. slider; 15. hinge seat; 16. swing plate; 17. round hole; 18. mounting bracket; 19. push rod; 20. drain pipe; 21. insulation shell; 22. hot insulation chamber; 23. bracket; 24. insulation cover; 25. cold insulation chamber; 26. sealing insulation pad; 27. upper ear plate; 28. lower ear plate. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0030] See also Figures 1 to 8 As shown, this embodiment provides a wood chip conveying device for biomass pellet fuel production, including a conveying shell 1, spiral blades 2, a rotating shaft 3, a rotating power source 4, a heating pipe 7, a condensation cover plate 8, a condensation pipe 9 and a wiper mechanism.

[0031] The two ends of the conveying shell 1 are respectively provided with a feed port 5 and a discharge port 6. The feed port 5 is used to receive the sawdust raw materials after crushing and fine powder, and the discharge port 6 conveys the dried sawdust to the feeding buffer bin of the pelletizing equipment.

[0032] A bearing is fixed on the conveying housing 1 , and the rotating shaft 3 is rotatably connected to the conveying housing 1 through the bearing. The spiral blade 2 is fixedly mounted on the rotating shaft 3 . The spiral blade 2 is located in the conveying housing 1 and is adapted to the conveying housing 1 .

[0033] The rotating power source 4 is a variable frequency motor, and the rotating power source 4 is connected to the rotating shaft 3. Specifically, a driving pulley is installed at the output end of the rotating power source 4, and a driven pulley is installed on the rotating shaft 3. The driving pulley and the driven pulley are connected by a transmission belt to achieve stable power transmission.

[0034] The rotating shaft 3 is driven to rotate by the rotary power source 4, which drives the spiral blade 2 to rotate. The rotation of the spiral blade 2 can push the wood chips to move from the feed port 5 to the discharge port 6 in the conveying shell 1, thereby achieving stable conveying of the wood chips.

[0035] The cross-section of the conveying shell 1 is designed to be U-shaped. This unique shape not only facilitates the accommodation and transportation of wood chips, but also facilitates the installation of a heating pipe 7 for introducing heat medium on the outer wall of the conveying shell 1 and facilitates the installation of a condensation cover plate 8 on the top of the conveying shell 1.

[0036] The heat medium circulates within the heating pipe 7, heating the wood chips within the conveyor housing 1 and evaporating the moisture therein, achieving a drying effect. A condensation cover 8 is fixed to the top of the conveyor housing 1, sealing the opening at the top of the conveyor housing 1. This condensation cover 8 significantly reduces the area of ​​communication between the conveyor housing 1 and the outside world, effectively reducing heat loss and maintaining a relatively high temperature within the conveyor housing 1, creating an ideal environment for drying wood chips.

[0037] In addition, a condensation pipe 9 for introducing refrigerant is installed on the upper end surface of the condensation cover 8. When the refrigerant flows in the condensation pipe 9, the condensation cover 8 can be cooled, so that the moisture generated by the evaporation of sawdust can be quickly condensed, ensuring that the air inside the conveying shell 1 is in a high-temperature dry state, further improving the drying efficiency and effect.

[0038] The wiper mechanism can remove the condensed water on the condensation cover plate 8. The wiper mechanism mainly includes a wiper groove 10 and a linear drive device 11. The linear drive device 11 can drive the wiper groove 10 to move left and right in the conveying shell 1. The left and right directions are defined as the width direction of the conveying shell 1. The left and right top ends of the wiper groove 10 are both provided with inward chamfers to facilitate wiping and guide water into the groove. When the wiper groove 10 moves to the left, it will tilt to the left, and its left top end will rotate upward as a wiper end and contact the lower end surface of the condensation cover plate 8, scraping off and collecting the condensed water on the lower end surface of the condensation cover plate 8. During this period, the right top end of the wiper groove 10 will be lower than its left top end to avoid contact with the condensation cover plate 8; when the wiper groove 10 moves to the right, it will tilt to the right, and its right top end will contact the lower end surface of the condensation cover plate 8 as a wiper end, scraping off and collecting the condensed water on the lower end surface of the condensation cover plate 8. During this period, the left top end of the wiper groove 10 will be lower than its right top end to avoid contact with the condensation cover plate 8. The collected condensed water is discharged out of the conveying shell 1 through a drain pipe 20 fixedly installed at one end of the scraper trough 10 near the feed port 5, ensuring that the air inside the conveying shell 1 always remains dry, avoiding the condensed water and wood chips from mixing again and affecting the drying effect.

[0039] The conveying housing 1 is provided with an opening for the drainage pipe 20 to pass through. The drainage pipe 20 is fixed to the opening. The drainage pipe 20 is a telescopic pipe or a flexible pipe to facilitate drainage while moving with the scraper tank 10.

[0040] Furthermore, in order to realize the function of tilting to the left when the wiper groove 10 moves to the left and tilting to the right when the wiper groove 10 moves to the right, the wiper mechanism further includes an insert rod 12, a push rod 19 and a plurality of swing components. Figures 5 to 8As shown, the swing assembly consists of a guide rod 13, a slider 14, a hinge seat 15, and a swing plate 16. The guide rod 13 is fixedly installed in the conveying housing 1, with its length parallel to the width of the condensation cover plate 8, providing a guide for the sliding of the slider 14. The slider 14 is slidably connected to the guide rod 13, and the upper end of the slider 14 is fixedly connected to the hinge seat 15. The lower end of the swing plate 16 is hinged to the hinge seat 15, and the upper end is fixedly connected to the wiper groove 10. The swing plate 16 has a circular hole 17. The outer diameter of the insertion rod 12 is smaller than the aperture of the circular hole 17. The insertion rod 12 is inserted into the circular hole 17 and can move left and right within the circular hole 17. The conveying housing 1 has an opening for the push rod 19 to pass through, and the push rod 19 is slidably connected to the opening.

[0041] The linear drive device 11 uses an electric cylinder, a servo cylinder, or a hydraulic cylinder. Each linear drive device 11 works synchronously. The linear drive device 11 is fixedly connected to the conveying shell 1, and its output end is connected to the push rod 19. The push rod 19 is connected to the insertion rod 12. The linear drive device 11 drives the insertion rod 12 to move left and right in the conveying shell 1 through the push rod 19.

[0042] See also Figure 7 As shown, when the driving push rod 19 moves to the right, the insertion rod 12 contacts the lower part of the inner arc surface on the right side of the circular hole 17, giving the swing plate 16 a rightward and downward force, causing the swing plate 16 to tilt to the right and move to the right, and the top right side of the scraper trough 10 contacts the lower end surface of the condensation cover 8, thereby achieving the scraper trough 10 to fully scrape the condensed water on the condensation cover 8; when the linear drive device 11 drives the push rod 19 to move to the left, please refer to Figure 8 As shown, the insertion rod 12 contacts the lower part of the inner arc surface on the left side of the circular hole 17, giving the swing plate 16 a leftward and downward force, causing the swing plate 16 to tilt to the left and move to the left, driving the left top end of the wiper groove 10 to contact the lower end surface of the condensation cover plate 8.

[0043] A certain friction resistance can be set between the guide rod 13 and the slider 14, such as installing a friction washer on the inner side of the slider 14 that contacts and cooperates with the guide rod 13. The friction washer increases the friction resistance between the guide rod 13 and the slider 14. The friction resistance between the guide rod 13 and the slider 14 is much greater than the resistance that needs to be overcome for the swing plate 16 to swing, so that when the insertion rod 12 pushes the swing plate 16 to move, the swing plate 16 can swing first and then move to the left or right.

[0044] During the biomass pellet fuel production process, wood chips that have been crushed and re-pulverized enter the device from the feed port 5 of the conveying shell 1. The rotary power source 4 is started, and the drive shaft 3 and the spiral blade 2 are driven by the driving pulley, the transmission belt, and the driven pulley to rotate, pushing the wood chips in the conveying shell 1 toward the discharge port 6. At the same time, a heat medium is introduced into the heating pipe 7, which circulates in the heating pipe 7 on the outer wall of the conveying shell 1, heating the wood chips in the conveying shell 1 and causing the moisture in the wood chips to evaporate; a refrigerant is introduced into the condensing pipe 9, which flows in the condensing pipe 9 on the upper end face of the condensing cover plate 8, cooling the condensing cover plate 8 and causing the evaporated moisture to quickly condense on the lower end face of the condensing cover plate 8.

[0045] When it is necessary to remove condensed water from the condensation cover plate 8, the linear drive device 11 is activated. The linear drive device 11 drives the plunger 12 to the left via the push rod 19. The plunger 12 contacts the inner arc surface on the left side of the circular hole 17 on the swing plate 16, causing the swing plate 16 to tilt to the left, driving the wiper trough 10 to tilt to the left. The left top end of the wiper trough 10 rotates upward as the wiper end and contacts the lower end surface of the condensation cover plate 8, scraping off the condensed water on the lower end surface of the condensation cover plate 8 and collecting it in the wiper trough 10. Next, the linear drive device 11 drives the push rod 19 to the right. The plunger 12 contacts the inner arc surface on the right side of the circular hole 17, causing the swing plate 16 to tilt to the right. The right top end of the wiper trough 10 contacts the lower end surface of the condensation cover plate 8, scraping off the condensed water on the right side of the condensation cover plate 8 and collecting it. The activation frequency of the linear drive device 11 can be automatically controlled by a program according to the humidity of the sawdust, or it can be flexibly controlled manually.

[0046] The condensed water collected in the wiper groove 10 is discharged outside the transport housing 1 through the drain pipe 20 .

[0047] The wood chips after being conveyed and dried by the device are output from the discharge port 6 to the feeding buffer bin of the pelletizing equipment, providing raw materials that meet the requirements for the subsequent pelletizing process.

[0048] When conveying relatively dry sawdust that does not need to be dried, there is no need to introduce heat medium into the heating pipe 7, nor is there any need to introduce refrigerant into the condensing pipe 9. This conveying device only performs conveying without drying, which can improve production efficiency.

[0049] In some embodiments, to facilitate installation of the linear drive device 11, refer to Figures 1 to 3 As shown, the wiper mechanism is further provided with a mounting bracket 18 , which is fixedly connected to the conveying housing 1 . The mounting bracket 18 is used to mount the linear drive device 11 to ensure the working stability of the linear drive device 11 .

[0050] In some embodiments, to reduce heat loss from the heating pipe 7 and the conveying housing 1, refer to Figure 1 、 Figure 2 、 Figure 6As shown, an insulation shell 21 is fixed to the outer wall of the conveying housing 1. A heat insulation cavity 22 is formed between the insulation shell 21 and the conveying housing 1. The heating pipe 7 is located in the heat insulation cavity 22. Its input and output ends both extend out of the heat insulation cavity 22, reducing heat loss from the heating pipe 7 and improving heating efficiency. To improve the insulation effect, the insulation shell 21 can be made of an insulating material such as polyurethane rigid foam sandwich panel, rock wool sandwich steel plate, etc.

[0051] In order to facilitate the installation of the rotary power source 4, a mounting seat is fixed on the heat-insulating cover 24, and the rotary power source 4 is installed on the mounting seat.

[0052] In some embodiments, to reduce the loss of cold energy from the condensation pipe 9 and the condensation cover plate 8, refer to Figures 1 to 3 ,as well as Figure 6 As shown, an insulation cover 24 is fixed to the upper end of the condensation cover plate 8. A cold insulation chamber 25 is formed between the insulation cover 24 and the condensation cover plate 8. The condensation pipe 9 is located in the cold insulation chamber 25, and its input and output ends both extend out of the cold insulation chamber 25. This reduces the loss of cold in the condensation pipe 9 and improves the condensation effect. To improve the insulation effect, the insulation cover 24 can be made of an insulating material such as phenolic foam fiberglass board, rock wool sandwich steel plate, etc.

[0053] In some embodiments, to facilitate the support of the device, see Figures 1 to 3 As shown, a bracket 23 is fixed to the lower end of the insulation shell 21. The lower end of the bracket 23 is equipped with a universal wheel with a brake to facilitate the movement of the device. The bracket 23 is high at one end and low at the other end, which can keep the conveying shell 1 in an inclined state, so that the height of the feed port 5 is lower than that of the discharge port 6, which facilitates the conveying of wood chips to a higher place.

[0054] In some embodiments, to further improve the drying effect of sawdust, please refer to Figure 6 As shown, the rotating shaft 3 is set as a hollow shaft with a through hole, and the through hole is used to pass the heat medium. Rotating joints are installed at both ends of the rotating shaft 3 to facilitate the continuous circulation of the heat medium during the rotation process.

[0055] By introducing heat medium into the rotating shaft 3, the spiral blades 2 and the wood chips can be further heated, thereby improving the heating effect and uniformity.

[0056] In some embodiments, since the temperature of the conveying shell 1 is high and the temperature of the condensing cover plate 8 is low, in order to reduce the heat exchange efficiency between the conveying shell 1 and the condensing cover plate 8, the condensing cover plate 8 is not directly fixed on the conveying shell 1, but a sealing insulation pad 26 is provided between the conveying shell 1 and the condensing cover plate 8. Figure 1 ,as well as Figures 6 to 8 As shown, a groove for installing a sealing insulation pad 26 is provided at the top of the conveying shell 1, the lower part of the sealing insulation pad 26 is installed in the groove, and the upper end of the sealing insulation pad 26 is in contact with the condensation cover plate 8.

[0057] To facilitate the fixing of the conveying housing 1 and the condensation cover 8, please refer to Figure 1 As shown, a plurality of lower ear plates 28 are fixed on the conveying shell 1, and a plurality of upper ear plates 27 are fixed on the condensing cover plate 8. The upper ear plates 27 correspond to the lower ear plates 28 one by one and are fixedly connected by a bolt assembly. The bolt assembly consists of bolts and nuts. This ensures the sealing of the device and facilitates installation and disassembly, while also ensuring the thermal insulation between the conveying shell 1 and the condensing cover plate 8.

[0058] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A wood chip conveying device for biomass pellet fuel production, comprising a conveying shell (1), a spiral blade (2), a rotating shaft (3), and a rotating power source (4), wherein the conveying shell (1) is provided with a feed port (5) and a discharge port (6) at both ends thereof, the rotating shaft (3) is rotatably connected to the conveying shell (1), the spiral blade (2) is fixedly mounted on the rotating shaft (3), the spiral blade (2) is located in the conveying shell (1) and is adapted to the conveying shell (1), and the rotating power source (4) is transmission-connected to the rotating shaft (3), characterized in that: The outer wall of the conveying shell (1) is provided with a heating pipe (7) for introducing heat medium, the top of the conveying shell (1) is fixed with a condensation cover (8) for closing the top opening thereof, and the upper end surface of the condensation cover (8) is provided with a condensation pipe (9) for introducing refrigerant; the conveying shell (1) also includes a wiper mechanism, the wiper mechanism includes a wiper groove (10) and a linear drive device (11), the linear drive device (11) is used to drive the wiper groove (10) to move left and right in the conveying shell (1), the wiper groove (10) will tilt to the left when moving to the left, and the left top end of the wiper groove (10) will rotate upward as a wiper end and align with the lower end of the condensation cover (8). The end face of the linear drive device (11) contacts the end face to scrape off and collect the condensed water on the condensation cover plate (8); when the scraper groove (10) moves to the right, it tilts to the right side, and the top right side of the scraper groove (10) acts as a scraping end and rotates upward and contacts the lower end face of the condensation cover plate (8) to scrape off and collect the condensed water on the condensation cover plate (8); the scraper mechanism also includes an insert rod (12), a plurality of swing components and a push rod (19), the output end of the linear drive device (11) is connected to the push rod (19), the push rod (19) is connected to the insert rod (12), and the linear drive device (11) drives the insert rod (12) to move left and right in the conveying shell (1) through the push rod (19).

2. The sawdust conveying device for biomass pellet fuel production according to claim 1, characterized in that: The swing assembly includes a guide rod (13), a slider (14), a hinge seat (15), and a swing plate (16). The guide rod (13) is fixedly installed in the conveying shell (1). The length direction of the guide rod (13) is arranged parallel to the width direction of the condensation cover plate (8). The slider (14) is slidably connected to the guide rod (13). The upper end of the slider (14) is fixedly connected to the hinge seat (15). The lower end of the swing plate (16) is hinged to the hinge seat (15). The upper end of the swing plate (16) is fixedly connected to the scraper groove (10). A circular hole (17) is opened on the swing plate (16). The outer diameter of the insertion rod (12) is smaller than the aperture of the circular hole (17). The insertion rod (12) is inserted in the circular hole (17) and can be inserted in the circular hole (17). The linear drive device (11) is fixedly connected to the conveying shell (1), and the linear drive device (11) drives the rod (12) to move left and right in the conveying shell (1); when the linear drive device (11) drives the rod (12) to move to the left, the rod (12) will contact the inner arc surface on the left side of the circular hole (17), so that the swing plate (16) tilts to the left and the left top of the scraper trough (10) contacts the lower end surface of the condensation cover plate (8); when the linear drive device (11) drives the rod (12) to move to the right, the rod (12) will contact the inner arc surface on the right side of the circular hole (17), so that the swing plate (16) tilts to the right and the right top of the scraper trough (10) contacts the lower end surface of the condensation cover plate (8).

3. The sawdust conveying device for biomass pellet fuel production according to claim 1, characterized in that: The wiper mechanism further comprises a mounting frame (18), the mounting frame (18) being fixedly connected to the conveying housing (1), and the linear drive device (11) being mounted on the mounting frame (18).

4. The sawdust conveying device for biomass pellet fuel production according to any one of claims 1 to 3, characterized in that: The wiper mechanism further comprises a drain pipe (20), which is fixedly mounted on one end of the wiper trough (10) near the feed port (5), the input end of the drain pipe (20) being in communication with the wiper trough (10), and the output end of the drain pipe (20) extending to the outside of the conveying housing (1).

5. The sawdust conveying device for biomass pellet fuel production according to claim 1, characterized in that: An insulation shell (21) is fixed on the outer wall of the conveying shell (1), and a heat insulation cavity (22) is formed between the insulation shell (21) and the conveying shell (1). The heating pipe (7) is located in the heat insulation cavity (22), and the input end and the output end of the heating pipe (7) both extend out of the heat insulation cavity (22).

6. The sawdust conveying device for biomass pellet fuel production according to claim 5, characterized in that: A bracket (23) is fixed to the lower end of the heat-insulating shell (21).

7. The sawdust conveying device for biomass pellet fuel production according to claim 1, characterized in that: A heat-insulating cover (24) is fixed to the upper end of the condensing cover plate (8), and a cold heat-insulating cavity (25) is formed between the heat-insulating cover (24) and the condensing cover plate (8). The condensing pipe (9) is located in the cold heat-insulating cavity (25), and both the input end and the output end of the condensing pipe (9) extend out of the cold heat-insulating cavity (25).

8. The sawdust conveying device for biomass pellet fuel production according to claim 1, characterized in that: The rotating shaft (3) is a hollow shaft having a through hole, and the through hole is used to allow the heat medium to pass through.

9. The sawdust conveying device for biomass pellet fuel production according to claim 1, characterized in that: A sealing heat-insulating pad (26) is provided between the conveying shell (1) and the condensing cover plate (8); a plurality of lower ear plates (28) are fixed on the conveying shell (1); a plurality of upper ear plates (27) are fixed on the condensing cover plate (8); the upper ear plates (27) correspond to the lower ear plates (28) one by one, and the upper ear plates (27) and the lower ear plates (28) are fixedly connected by a bolt assembly.

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