Wood chip conveying device for biomass pellet fuel production

Abstract

The invention relates to the technical field of biomass particle fuel production equipment, in particular to a wood chip conveying device for biomass particle fuel production, which comprises a conveying shell, a spiral blade, a rotating shaft, a rotating power source, a heating pipeline, a condensation cover plate, a condensation pipeline and a water scraping mechanism. The drying function is integrated in the wood chip conveying process, additional drying equipment is not needed, the equipment purchase and installation cost is effectively reduced, the site occupied space is reduced, meanwhile, the unnecessary cost caused by the fact that raw material wood chips still need to pass through the drying equipment when the water content is low is avoided, and the production benefit is remarkably improved; the conveying shell and wood chips in the conveying shell are heated through the heating pipeline, heat loss is reduced in cooperation with the condensation cover plate, moisture is rapidly condensed through the condensation pipeline, condensate water is removed in time through the water scraping mechanism, the high-temperature dry environment is kept in the conveying shell, efficient drying of the wood chips is achieved, and the dryness of the wood chips is guaranteed; and high-quality raw materials are provided for a subsequent granulation process.

Description

Technical Field

[0001] The present invention relates to the technical field of biomass pellet fuel production equipment, and particularly 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 go through crushing and secondary fine powdering in sequence, and finally become sawdust. Subsequently, the sawdust is transported to the feeding buffer bin of the pelletizing equipment through a screw conveyor for pelletizing.

[0003] When the moisture content of the sawdust is relatively high, in order to meet the pelletizing requirements, a drying device needs to be added between the screw conveyor and the pelletizing equipment to dry the sawdust. However, this solution has many drawbacks: on the one hand, the newly added drying device significantly increases the equipment purchase and installation costs, and at the same time occupies more site space; on the other hand, when the moisture content of the raw material sawdust is low and no drying is required, it still needs to flow through the drying device to reach the pelletizing equipment, which not only increases the production cost in vain, but also seriously reduces the production efficiency.

[0004] Therefore, it is of great significance to develop a conveying device that does not require additional configuration of a drying device and can realize the drying treatment of sawdust during the conveying process, so as to optimize the biomass pellet fuel production process, reduce costs, and improve efficiency. Summary of the Invention

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

[0006] The technical problems solved by the present invention are realized by the following technical solutions: The sawdust conveying device for biomass pellet fuel production of the present invention mainly consists of core components such as a conveying housing, a spiral blade, a rotating shaft, and a rotating power source.

[0007] An inlet and an outlet are respectively arranged at both ends of the conveying housing. The inlet is used to receive the sawdust raw materials after crushing and fine powdering, and the outlet conveys the dried sawdust to the feeding buffer bin of the pelletizing equipment. The rotating shaft is rotatably connected to the conveying housing to provide support for the rotation of the spiral blade. The spiral blade is fixedly installed on the rotating shaft and is located inside the conveying housing and is adapted to the conveying housing. Driven by the rotating power source, the rotation of the spiral blade can push the sawdust in the conveying housing to move from the inlet to the outlet, realizing the stable conveying of the sawdust.

[0008] Through the circulating flow of the heat medium in the heating pipeline, the wood chips in the conveying housing can be heated, thereby evaporating the moisture in the wood chips and realizing the drying function. A condensation cover plate is fixed at the top of the conveying housing. This condensation cover plate seals the open top of the conveying housing, greatly reducing the communication area between the conveying housing and the outside world, effectively reducing heat dissipation, enabling the interior of the conveying housing to maintain a relatively high temperature, and creating good environmental conditions for drying the wood chips. In addition, a condensation pipeline for introducing a refrigerant is installed on the upper end surface of the condensation cover plate. When the refrigerant flows in the condensation pipeline, it can cool down the condensation cover plate, prompting the moisture evaporated from the wood chips to condense quickly, ensuring that the air inside the conveying housing is in a high-temperature and dry state, and further improving the drying efficiency and effect.

[0009] To timely remove the condensed water on the condensation cover plate, a water scraping mechanism is also provided in this device. The water scraping mechanism mainly includes a water scraping groove and a linear driving device. The linear driving device can drive the water scraping groove to move left and right in the conveying housing. When the water scraping groove moves to the left, it will tilt to the left, and its left top end, as the water scraping end, will rotate upward and contact the lower end surface of the condensation cover plate, scraping and collecting the condensed water on the lower end surface of the condensation cover plate; when the water scraping groove moves to the right, it tilts to the right, and its right top end, as the water scraping end, contacts the lower end surface of the condensation cover plate, scraping and collecting the condensed water on the lower end surface of the condensation cover plate. The collected condensed water is discharged outside the conveying housing through a drain pipe fixedly installed at one end of the water scraping groove close to the feeding port, ensuring that the air inside the conveying housing always remains in a dry state, preventing the condensed water from mixing with the wood chips again and affecting the drying effect.

[0010] Furthermore, the water scraping mechanism further includes a plug rod, a push rod, and multiple swinging components. Each swinging component consists of a guiding rod, a slider, a hinge seat, and a swinging plate. The guiding rod is fixedly installed inside the conveying housing, 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 guiding rod, and the upper end of the slider is fixedly connected to the hinge seat; the lower end of the swinging plate is hinged to the hinge seat, and the upper end is fixedly connected to the water scraping groove; a round hole is formed in the swinging plate, the outer diameter of the plug rod is smaller than the aperture of the round hole, and the plug rod is inserted into the round hole and can move left and right in the round hole. The linear driving device is fixedly connected to the conveying housing, its output end is connected to the push rod, the push rod is connected to the plug rod, and the linear driving device drives the plug rod to move left and right inside the conveying housing through the push rod. When the linear driving device drives the push rod to move to the left, the plug rod contacts the left inner arc surface of the round hole, causing the swinging plate to tilt to the left, driving the left top end of the water scraping groove to contact the lower end surface of the condensation cover plate; when driving the push rod to move to the right, the plug rod contacts the right inner arc surface of the round hole, causing the swinging plate to tilt to the right, and the right top end of the water scraping groove contacts the lower end surface of the condensation cover plate, thereby realizing the comprehensive scraping of the condensed water on the condensation cover plate by the water scraping groove.

[0011] In addition, the water scraping mechanism is also provided with a mounting frame, which is fixedly connected to the conveying housing and used for mounting the linear driving device to ensure the stability of the linear driving device during operation.

[0012] A heat preservation shell is fixed to the outer wall of the conveying shell. A heat preservation cavity is formed between the heat preservation shell and the conveying shell. The heating pipeline is located in the heat preservation cavity, and its input end and output end both extend out of the heat preservation cavity, reducing the heat loss of the heating pipeline and improving the heating efficiency. A heat preservation cover is fixed to the upper end of the condensation cover plate. A cold insulation cavity is formed between the heat preservation cover and the condensation cover plate. The condensation pipeline is located in the cold insulation cavity, and its input end and output end both extend out of the cold insulation cavity, reducing the cold loss of the condensation pipeline and enhancing the condensation effect.

[0013] A support is fixed to the lower end of the heat preservation shell, and a universal wheel with a brake is installed at the lower end of the support, which is convenient for moving the device. One end of the support is high and the other end is low, which can keep the conveying shell in an inclined state, making the height of the feed inlet lower than that of the discharge outlet, and facilitating the transportation of wood chips to a higher place.

[0014] The rotating shaft is a hollow shaft with a through hole for passing heat medium. Rotary joints are installed at both ends of the rotating shaft. By passing heat medium through the rotating shaft, the spiral blades and wood chips can be further heated, improving the heating effect and uniformity. A sealing and heat insulation pad is provided between the conveying shell and the condensation cover plate. A plurality of lower ear plates are fixed to the conveying shell, and a plurality of upper ear plates are fixed to the condensation cover plate. The upper ear plates and the lower ear plates correspond one by one and are fixedly connected by bolt assemblies, which not only ensures the sealing performance of the device but also facilitates installation and disassembly.

[0015] Compared with the prior art, the present invention has at least the following beneficial technical effects: 1. Integrated drying function, cost reduction: 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, reducing the floor space occupied, and avoiding unnecessary costs caused by the need to pass through the drying equipment when the moisture content of the raw material wood chips is relatively low, significantly improving the production efficiency. 2. High-efficiency drying, quality assurance: The heating pipeline heats the conveying shell and the internal wood chips. The condensation cover plate reduces heat loss, the condensation pipeline quickly condenses moisture, and the water scraping mechanism timely removes the condensed water, maintaining a high-temperature and dry environment inside the conveying shell, realizing the high-efficiency drying of wood chips, ensuring the dryness of the wood chips, providing high-quality raw materials for the subsequent granulation process, and improving the production quality of biomass pellet fuel. 3. Ingenious structure and stable operation: The swing component of the wiper mechanism is exquisitely designed. Through the cooperation of the insertion rod, the push rod and the round hole on the swing plate, the wiper groove can be flexibly tilted left and right, ensuring the comprehensive scraping of the condensed water on the condensation cover plate; the heat preservation shell and the heat preservation cover respectively play a good heat preservation role for the heating pipeline and the condensation pipeline, reducing the loss of heat and cold; the rotating shaft adopts a hollow shaft and passes through the heat medium, further improving the heating effect and uniformity; the sealing and heat insulation gasket and the bolt assembly connection method between the conveying shell and the condensation cover plate ensure the sealing performance of the device and the convenience of installation and disassembly, making the whole device operate stably and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is an exploded view of the wood chip conveying device for biomass pellet fuel production provided by the embodiment of the present application; Figure 2 It is a three-dimensional view of the wood chip conveying device for biomass pellet fuel production provided by the embodiment of the present application; Figure 3 It is a top view of the wood chip conveying device for biomass pellet fuel production provided by the embodiment of the present application; Figure 4 It is a partial schematic view of the wood chip conveying device for biomass pellet fuel production provided by the embodiment of the present application (the bracket is not shown); Figure 5 For Figure 1 The partial enlarged view at position A in Figure 6 For Figure 4 The cross-sectional view along line B-B in Figure 7 For Figure 6 The partial enlarged view at position C in (the insertion rod moves to the right and contacts the inner arc surface on the right side of the round hole); Figure 8 For Figure 7 Another state diagram of (the insertion rod changes from moving to the right and contacting the inner arc surface on the right side of the round hole to moving to the left and contacting the inner arc surface on the left side of the round hole); 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 plate; 9. condensation pipe; 10. scraper trough; 11. linear drive device; 12. plug rod; 13. guide rod; 14. slider; 15. hinge seat; 16. swing plate; 17. round hole; 18. mounting frame; 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

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0019] 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.

[0020] 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.

[0021] 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 .

[0022] The rotating power source 4 uses 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.

[0023] The rotating shaft 3 is driven to rotate by the rotating 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 realizing stable conveying of the wood chips.

[0024] The cross-section of the conveying shell 1 is designed to be U-shaped. This unique shape is not only convenient for containing and conveying wood chips, but also conducive to installing a heating pipe 7 for introducing heat medium on the outer wall of the conveying shell 1 and facilitating the installation of a condensation cover plate 8 on the top of the conveying shell 1.

[0025] Through the circulating flow of the heat medium in the heating pipe 7, the wood chips in the conveying housing 1 can be heated, thereby evaporating the moisture in the wood chips and realizing the drying function. A condensation cover plate 8 is fixed at the top end of the conveying housing 1. The condensation cover plate 8 closes the open top of the conveying housing 1, greatly reducing the communication area between the conveying housing 1 and the outside, effectively reducing heat dissipation, enabling the inside of the conveying housing 1 to maintain a relatively high temperature, and creating good environmental conditions for drying the wood chips.

[0026] In addition, a condensation pipe 9 for introducing a refrigerant is installed on the upper end surface of the condensation cover plate 8. When the refrigerant flows in the condensation pipe 9, the condensation cover plate 8 can be cooled, promoting the rapid condensation of the moisture generated by the evaporation of the wood chips, ensuring that the air inside the conveying housing 1 is in a high-temperature and dry state, and further improving the drying efficiency and effect.

[0027] The water scraping mechanism can remove the condensed water on the condensation cover plate 8. The water scraping mechanism mainly includes a water scraping groove 10 and a linear driving device 11. The linear driving device 11 can drive the water scraping groove 10 to move left and right in the conveying housing 1. The left-right direction is defined as the width direction of the conveying housing 1. Chamfers are provided at the left and right top ends of the water scraping groove 10, which are convenient for scraping water and guiding the water into the groove. When the water scraping groove 10 moves to the left, it will tilt to the left. The left top end thereof serves as the water scraping end and will rotate upward to contact the lower end surface of the condensation cover plate 8, scraping 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 water scraping groove 10 will be lower than its left top end to avoid contacting the condensation cover plate 8; when the water scraping groove 10 moves to the right, it will tilt to the right. The right top end serves as the water scraping end and contacts the lower end surface of the condensation cover plate 8, scraping 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 water scraping groove 10 will be lower than its right top end to avoid contacting the condensation cover plate 8. The collected condensed water is discharged outside the conveying housing 1 through a drain pipe 20 fixedly installed at one end of the water scraping groove 10 close to the feed port 5, ensuring that the air inside the conveying housing 1 always remains in a dry state and preventing the condensed water from mixing with the wood chips again, which affects the drying effect.

[0028] An opening for the drain pipe 20 to pass through is provided on the conveying housing 1. The drain pipe 20 is fixed to the opening. The drain pipe 20 is selected as a telescopic pipe or a flexible pipe, which is convenient for draining water while moving with the water scraping groove 10.

[0029] Furthermore, in order to realize the function that the water scraping groove 10 tilts to the left when moving to the left and tilts to the right when moving to the right, the water scraping mechanism is further provided with a plug rod 12, a push rod 19 and a plurality of swing components. Please refer to Figures 5 to 8As shown in the figure, the swing assembly is composed 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, and its length direction is parallel to the width direction of the condensation cover plate 8, providing guidance 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 water scraping groove 10; a round hole 17 is formed in the swing plate 16, the outer diameter of the insertion rod 12 is smaller than the aperture of the round hole 17, and the insertion rod 12 is inserted into the round hole 17 and can move left and right in the round hole 17. An opening for the push rod 19 to pass through is formed in the conveying housing 1, and the push rod 19 is slidably connected to the opening.

[0030] The linear drive device 11 is selected as an electric cylinder, or 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 housing 1, its output end is connected to the push rod 19, the push rod 19 is connected to the insertion rod 12, and the linear drive device 11 drives the insertion rod 12 to move left and right in the conveying housing 1 through the push rod 19.

[0031] Please refer to Figure 7 As shown in the figure, when the push rod 19 is driven to move to the right, the insertion rod 12 contacts the lower part of the inner arc surface on the right side of the round hole 17, giving a force to the swing plate 16 to the right and downward, causing the swing plate 16 to tilt to the right and move to the right. The top end on the right side of the water scraping groove 10 contacts the lower end surface of the condensation cover plate 8, so as to realize the comprehensive scraping of the condensed water on the condensation cover plate 8 by the water scraping groove 10; when the linear drive device 11 drives the push rod 19 to move to the left, please refer to Figure 8 As shown in the figure, the insertion rod 12 contacts the lower part of the inner arc surface on the left side of the round hole 17, giving a force to the swing plate 16 to the left and downward, causing the swing plate 16 to tilt to the left and move to the left, driving the top end on the left side of the water scraping groove 10 to contact the lower end surface of the condensation cover plate 8.

[0032] A certain frictional resistance can be set between the guide rod 13 and the slider 14. For example, a friction washer in contact with the guide rod 13 is installed on the inner side of the slider 14. The friction washer increases the frictional resistance between the guide rod 13 and the slider 14. The frictional resistance between the guide rod 13 and the slider 14 is much greater than the resistance that needs to be overcome for the swing of the swing plate 16, which is convenient for the swing plate 16 to swing first and then move left or right when the insertion rod 12 pushes the swing plate 16 to move.

[0033] During the production process of biomass pellet fuel, the wood chips after crushing and secondary fine powder enter the device from the feed port 5 of the conveying housing 1. Start the rotary power source 4. Through the transmission of the driving pulley, the transmission belt and the driven pulley, drive the rotating shaft 3 and the spiral blade 2 to rotate, and push the wood chips to move towards the discharge port 6 in the conveying housing 1. At the same time, introduce the heat medium into the heating pipe 7, and the heat medium circulates in the heating pipe 7 on the outer wall of the conveying housing 1 to heat the wood chips in the conveying housing 1, promoting the evaporation of the moisture in the wood chips; introduce the refrigerant into the condensation pipe 9, and the refrigerant flows in the condensation pipe 9 on the upper end face of the condensation cover plate 8 to cool the condensation cover plate 8, so that the evaporated moisture quickly condenses on the lower end face of the condensation cover plate 8.

[0034] When it is necessary to remove the condensed water on the condensation cover plate 8, start the linear driving device 11. It drives the insertion rod 12 to move leftward through the push rod 19. The insertion rod 12 contacts the inner arc surface on the left side of the round hole 17 on the swing plate 16, making the swing plate 16 tilt leftward, driving the water scraping groove 10 to tilt leftward. The left top end of the water scraping groove 10 serves as the water scraping end and rotates upward to contact the lower end face of the condensation cover plate 8, scraping the condensed water on the lower end face of the condensation cover plate 8 and collecting it into the water scraping groove 10; then, the linear driving device 11 drives the push rod 19 to move rightward. The insertion rod 12 contacts the inner arc surface on the right side of the round hole 17, making the swing plate 16 tilt rightward. The right top end of the water scraping groove 10 contacts the lower end face of the condensation cover plate 8, scraping the condensed water on the right side of the condensation cover plate 8 and collecting it. The starting frequency of the linear driving device 11 can be automatically controlled through a program according to the humidity of the wood chips, or can be flexibly controlled manually.

[0035] The condensed water collected in the water scraping groove 10 is discharged outside the conveying housing 1 through the drain pipe 20.

[0036] The wood chips after being conveyed and dried by this device are output from the discharge port 6 to the feeding buffer bin of the granulation equipment, providing raw materials that meet the requirements for the subsequent granulation process.

[0037] When conveying relatively dry wood chips that do not require drying, there is no need to introduce the heat medium into the heating pipe 7, nor is there a need to introduce the refrigerant into the condensation pipe 9. This conveying device only conveys and does not dry, which can improve production efficiency.

[0038] In some embodiments, for the convenience of installing the linear driving device 11, please refer to Figures 1 to 3 As shown, the water scraping mechanism is also provided with a mounting frame 18. The mounting frame 18 is fixedly connected to the conveying housing 1. The mounting frame 18 is used to install the linear driving device 11 to ensure the stability of the operation of the linear driving device 11.

[0039] In some embodiments, to reduce the heat loss of the heating pipe 7 and the conveying housing 1, please refer to Figure 1 、 Figure 2 、 Figure 6As shown in the figure, a heat preservation shell 21 is fixedly arranged on the outer wall of the conveying shell 1. A heat preservation cavity 22 is formed between the heat preservation shell 21 and the conveying shell 1. The heating pipeline 7 is located in the heat preservation cavity 22, and its input end and output end both extend out of the heat preservation cavity 22, reducing the heat loss of the heating pipeline 7 and improving the heating efficiency. To improve the heat preservation effect, the material of the heat preservation shell 21 can be selected from heat preservation materials such as rigid polyurethane foam sandwich panels and rock wool sandwich steel plates.

[0040] To facilitate the installation of the rotary power source 4, a mounting seat is fixedly arranged on the heat preservation cover 24, and the rotary power source 4 is installed on the mounting seat.

[0041] In some embodiments, to reduce the cold loss of the condensation pipeline 9 and the condensation cover plate 8, please refer to Figures 1 to 3 , and Figure 6 As shown in the figure, a heat preservation cover 24 is fixedly arranged at the upper end of the condensation cover plate 8. A cold insulation cavity 25 is formed between the heat preservation cover 24 and the condensation cover plate 8. The condensation pipeline 9 is located in the cold insulation cavity 25, and its input end and output end both extend out of the cold insulation cavity 25, reducing the cold loss of the condensation pipeline 9 and improving the condensation effect. To improve the heat preservation effect, the material of the heat preservation cover 24 can be selected from materials such as phenolic foam glass fiber boards and rock wool sandwich steel plates.

[0042] In some embodiments, to facilitate the support of the device, please refer to Figures 1 to 3 As shown in the figure, a bracket 23 is fixedly arranged at the lower end of the heat preservation shell 21. A universal wheel with a brake is installed at the lower end of the bracket 23, which can facilitate the movement of the device. One end of the bracket 23 is high and the other end is low, which can make the conveying shell 1 keep an inclined state, so that the height of the feed inlet 5 is lower than the height of the discharge outlet 6, facilitating the conveying of wood chips to a higher place.

[0043] In some embodiments, to further improve the drying effect of the wood chips, please refer to Figure 6 As shown in the figure, the rotating shaft 3 is a hollow shaft with through holes, and the through holes are used to pass through the heat medium. Rotary joints are installed at both ends of the rotating shaft 3, which can facilitate the continuous circulation of the heat medium during rotation.

[0044] By passing the heat medium through the rotating shaft 3, the spiral blade 2 and the wood chips can be further heated, improving the heating effect and uniformity.

[0045] In some embodiments, since the temperature of the conveying shell 1 is high and the temperature of the condensation cover plate 8 is low, to reduce the heat exchange efficiency between the conveying shell 1 and the condensation cover plate 8, the condensation cover plate 8 is not directly fixed on the conveying shell 1, but a sealing and heat insulation pad 26 is provided between the conveying shell 1 and the condensation cover plate 8. Please refer to Figure 1 , and Figures 6 to 8 As shown in the figure, a groove for installing the sealing and heat insulation pad 26 is provided at the top end of the conveying shell 1. The lower part of the sealing and heat insulation pad 26 is installed in the groove, and the upper end of the sealing and heat insulation pad 26 is in contact with the condensation cover plate 8.

[0046] To facilitate the fixation of the conveying housing 1 and the condensation cover plate 8, please refer to Figure 1 As shown, a plurality of lower ear plates 28 are fixed on the conveying housing 1, and a plurality of upper ear plates 27 are fixed on the condensation cover plate 8. The upper ear plates 27 and the lower ear plates 28 are in one-to-one correspondence and are fixedly connected by a bolt assembly composed of a bolt and a nut. This not only ensures the sealing performance of the device, but also facilitates installation and disassembly. At the same time, it also ensures the heat insulation between the conveying housing 1 and the condensation cover plate 8.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A sawdust conveying device for biomass pellet fuel production, comprising a conveying housing (1), a spiral blade (2), a rotating shaft (3), and a rotating power source (4). Feed inlets (5) and discharge outlets (6) are respectively provided at both ends of the conveying housing (1). The rotating shaft (3) is rotatably connected to the conveying housing (1). The spiral blade (2) is fixedly installed on the rotating shaft (3). The spiral blade (2) is located inside the conveying housing (1) and is adapted to the conveying housing (1). The rotating power source (4) is drivingly connected to the rotating shaft (3). It is characterized in that, On the outer wall of the conveying housing (1), a heating pipe (7) for introducing heat medium is installed. At the top of the conveying housing (1), a condensation cover plate (8) for closing the top opening is fixed. On the upper end face of the condensation cover plate (8), a condensation pipe (9) for introducing refrigerant is installed. It further includes a water scraping mechanism. The water scraping mechanism includes a water scraping groove (10) and a linear driving device (11). The linear driving device (11) is used to drive the water scraping groove (10) to move left and right in the conveying housing (1). When the water scraping groove (10) moves to the left, it will tilt to the left. The left top end of the water scraping groove (10) serves as the water scraping end and will rotate upward to contact the lower end face of the condensation cover plate (8) to scrape and collect the condensed water on the condensation cover plate (8). When the water scraping groove (10) moves to the right, it will tilt to the right. The right top end of the water scraping groove (10) serves as the water scraping end and will rotate upward to contact the lower end face of the condensation cover plate (8) to scrape and collect the condensed water on the condensation cover plate (8).

2. The wood chip conveying device for biomass pellet fuel production according to claim 1, wherein The water scraping mechanism further includes a plug rod (12) and a plurality of swing components. The swing components include 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). The length direction of the guide rod (13) is 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 water scraping groove (10). A circular hole (17) is formed in the swing plate (16). The outer diameter of the plug rod (12) is smaller than the aperture of the circular hole (17). The plug rod (12) is inserted into the circular hole (17) and can move left and right in the circular hole (17). The linear driving device (11) is fixedly connected to the conveying housing (1). The linear driving device (11) drives the plug rod (12) to move left and right in the conveying housing (1). When the linear driving device (11) drives the plug rod (12) to move to the left, the plug rod (12) will contact the left inner arc surface of the circular hole (17) to make the swing plate (16) tilt to the left and the left top end of the water scraping groove (10) contact the lower end face of the condensation cover plate (8). When the linear driving device (11) drives the plug rod (12) to move to the right, the plug rod (12) will contact the right inner arc surface of the circular hole (17) to make the swing plate (16) tilt to the right and the right top end of the water scraping groove (10) contact the lower end face of the condensation cover plate (8).

3. The wood chip conveying device for biomass pellet fuel production according to claim 2, wherein, The water scraping mechanism further includes a mounting frame (18). The mounting frame (18) is fixedly connected to the conveying housing (1). The linear driving device (11) is installed on the mounting frame (18).

4. The wood chip conveying device for biomass pellet fuel production according to claim 2, characterized in that, The water scraping mechanism further includes a push rod (19). The output end of the linear driving device (11) is connected to the push rod (19). The push rod (19) is connected to the plug rod (12). The linear driving device (11) drives the plug rod (12) to move left and right in the conveying housing (1) through the push rod (19).

5. The wood chip conveying device for biomass pellet fuel production according to any one of claims 1 to 4, characterized in that, The wiper mechanism further includes a drain pipe (20). The drain pipe (20) is fixedly installed at one end of the wiper trough (10) close to the feed port (5). The input end of the drain pipe (20) is communicated with the wiper trough (10), and the output end of the drain pipe (20) extends outside the conveying housing (1).

6. The wood chip conveying device for biomass pellet fuel production according to claim 1, characterized in that, A heat preservation housing (21) is fixedly installed on the outer wall of the conveying housing (1). A heat preservation cavity (22) is formed between the heat preservation housing (21) and the conveying housing (1). The heating pipe (7) is located in the heat preservation cavity (22). The input end and the output end of the heating pipe (7) both extend out of the heat preservation cavity (22).

7. The wood chip conveying device for biomass pellet fuel production according to claim 6, characterized in that, A support (23) is fixedly installed at the lower end of the heat preservation housing (21).

8. The wood chip conveying device for biomass pellet fuel production according to claim 1, characterized in that, A heat preservation cover (24) is fixedly installed at the upper end of the condensation cover plate (8). A cold insulation cavity (25) is formed between the heat preservation cover (24) and the condensation cover plate (8). The condensation pipe (9) is located in the cold insulation cavity (25). The input end and the output end of the condensation pipe (9) both extend out of the cold insulation cavity (25).

9. The wood chip conveying device for biomass pellet fuel production according to claim 1, characterized in that, The rotating shaft (3) is a hollow shaft with a through hole, and the through hole is used for passing a heat medium.

10. The wood chip conveying device for biomass pellet fuel production according to claim 1, characterized in that, A sealing and heat insulation gasket (26) is arranged between the conveying housing (1) and the condensation cover plate (8). A plurality of lower ear plates (28) are fixedly installed on the conveying housing (1). A plurality of upper ear plates (27) are fixedly installed on the condensation cover plate (8). The upper ear plates (27) and the lower ear plates (28) are in one-to-one correspondence, and the upper ear plates (27) and the lower ear plates (28) are fixedly connected through bolt assemblies.

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