Tail gas waste heat recycling type grain drying machine

Abstract

The invention relates to the technical field of grain drying equipment, in particular to a tail gas waste heat recycling type grain dryer which comprises an inner barrel with the top end closed, a plurality of first air holes are evenly formed in the side wall of the inner barrel, the inner barrel is sleeved with an outer barrel, and a plurality of second air holes are evenly formed in the side wall of the outer barrel; a lower conical hopper is arranged at the bottom of the outer barrel, a spiral lifting mechanism is arranged in the lower conical hopper, the outer barrel is sleeved with a tail gas collecting chamber, the tail gas collecting chamber communicates with the outer barrel through a second air hole, and a plurality of moisture removal holes are evenly formed in the top of the tail gas collecting chamber; the bottom of the outer cylinder is communicated with the output end of a hot air fan; the input end of the hot air fan is communicated with a hot air furnace; the tail gas collecting chamber communicates with the second hot air pipeline. The tail gas recovery device has the beneficial effects that tail gas enters the second hot air pipeline from the air return pipeline and is mixed with hot air generated in the hot air furnace to form tail gas recovery circulation, so that the heat efficiency is improved, and the heat consumption of the drying machine is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of grain drying equipment, and in particular to a tail gas waste heat circulation recovery type grain dryer. Background Art

[0002] Grain dryers are a key link in grain production. Grain dryers are widely used in my country. The heat medium of existing grain dryers is mainly hot air (commonly known as hot air) generated by hot air furnaces. The hot air is conveyed into the dryer by positive pressure or negative pressure suction of the fan. The hot air exchanges heat and moisture with the grain in the dryer, and the grain reduces moisture to achieve drying. While the hot air absorbs moisture, the temperature of the hot air decreases and becomes tail gas with a certain temperature to be discharged. At this time, the tail gas contains water vapor, dust impurities, heat, etc. Since the tail gas contains heat, the tail gas is directly discharged into the atmosphere, resulting in a waste of this part of heat. However, considering the influence of water vapor and dust impurities in the tail gas, the technical difficulty of solving the problem increases. At present, many methods are abandoned because of the high cost of isolating water vapor and dust. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a waste heat recycling type grain dryer for exhaust gas, so as to realize waste heat recovery in the exhaust gas and reduce the heat consumption of the grain dryer.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: a waste heat recycling type grain dryer for tail gas comprises an inner cylinder with a closed top, a plurality of first air holes are evenly arranged on the side wall of the inner cylinder, an outer cylinder is arranged outside the inner cylinder, a plurality of second air holes are evenly arranged on the side wall of the outer cylinder, the inner wall of the outer cylinder is spaced apart from the outer wall of the inner cylinder for accommodating grain; a lower cone bucket is arranged at the bottom of the outer cylinder, the top of the lower cone bucket is connected to the bottom of the outer cylinder, a spiral lifting mechanism is arranged in the lower cone bucket, and the bottom end of the spiral lifting mechanism is arranged at the bottom of the lower cone bucket The top end of the spiral lifting mechanism extends to the top of the outer cylinder to transport the grain in the lower cone bucket upward and then drop it between the outer cylinder and the inner cylinder; an exhaust gas collecting chamber is arranged outside the outer cylinder, and the exhaust gas collecting chamber is connected with the outer cylinder through the second air hole, and a plurality of moisture discharge holes are evenly arranged on the top of the exhaust gas collecting chamber; the bottom of the outer cylinder is connected with the output end of the hot air blower through the first hot air duct, and the input end of the hot air blower is connected with the hot air furnace through the second hot air duct; the exhaust gas collecting chamber is connected with the second hot air duct through the return air duct.

[0005] The beneficial effect of the present invention is that an exhaust gas collecting chamber is added to the outer layer of the outer cylinder, and during the grain drying process, a part of the exhaust gas is directly discharged, and the other part of the exhaust gas enters the exhaust gas collecting chamber, and then uses the negative pressure power of the hot air blower to enter the second hot air duct from the return air duct, mixes with the hot air generated in the hot air furnace and forms an exhaust gas recovery cycle, thereby improving the thermal efficiency and reducing the heat consumption of the dryer.

[0006] Based on the above technical solution, the present invention can also be improved as follows.

[0007] Furthermore, an air regulating valve is provided on the return air duct.

[0008] The beneficial effect of adopting the above further scheme is that the air regulating valve can be adjusted manually or the opening degree of the air regulating valve can be intelligently controlled by the servo motor transmission mechanism, so as to adjust the waste heat recovery effect by the size of the return air volume.

[0009] Furthermore, the spiral lifting mechanism includes a lifting pipe, the bottom end of which is arranged at the bottom of the inner cavity of the lower cone bucket, and the bottom of the lifting pipe is connected to the bottom of the inner cavity of the lower cone bucket, the top of the lifting pipe extends upward to the vertical top of the outer tube, and a spiral auger extending along the length direction of the lifting pipe is provided in the lifting pipe, and a driving mechanism for driving the spiral auger to rotate is provided at the bottom of the lower cone bucket.

[0010] The beneficial effect of adopting the above further scheme is: the rotation of the spiral auger drives the grain that falls into the lower cone bucket to be transported from the lifting pipe to the top of the outer cylinder and then falls between the outer cylinder and the inner cylinder. Then, the grain is dried by hot air during the process of falling from the top of the outer cylinder to the lower cone bucket, and finally falls into the lower cone bucket, and then transported upward by the spiral auger to achieve cyclic drying. This process is repeated many times until the moisture content of the grain reaches the requirement, thereby achieving cyclic drying of the grain and improving the drying effect.

[0011] Furthermore, the lifting pipe is vertically arranged, passes through the inner tube and extends out from the top of the inner tube, and the outer wall of the lifting pipe is connected to the top of the inner tube.

[0012] The beneficial effect of adopting the above further scheme is that the lifting pipe is arranged vertically and connected to the top of the inner cylinder, which facilitates the fixation of the lifting pipe, and after the grain is transported to the top of the outer cylinder, it can fall evenly between the outer cylinder and the inner cylinder, avoiding the accumulation of grain in one place.

[0013] Furthermore, the axis of the lifting pipe coincides with the axis of the inner tube, and a grain guiding slope is provided on the top of the inner tube.

[0014] The beneficial effect of adopting the above further solution is that the setting of the grain guiding slope can prevent grain from piling up on the top of the inner cylinder, and the grain guiding slope can evenly distribute the grain that falls on the top of the inner cylinder, thereby improving the drying effect.

[0015] Furthermore, a grain collecting pipe with a closed bottom end is fixedly provided at the bottom of the lower cone bucket, the top of the grain collecting pipe is connected to the bottom of the lower cone bucket, the bottom end of the lifting pipe is fixedly connected to the bottom of the grain collecting pipe, the driving mechanism is arranged on the bottom end of the grain collecting pipe, and the bottom side wall of the lifting pipe is provided with a lifting inlet connected to the grain collecting pipe.

[0016] The beneficial effect of adopting the above further scheme is that the provision of the grain collecting pipe can facilitate the collection of the grains that fall into the lower cone bucket to the lifting entrance, thereby facilitating the upward transportation of the grains.

[0017] Furthermore, a grain unloading cover is provided at the top of the lifting pipe, the bottom of the grain unloading cover is open downward, and a plurality of grain unloading ports connected to the grain unloading cover are provided on the top side of the lifting pipe.

[0018] The beneficial effect of adopting the above further scheme is that the setting of the grain unloading hood can prevent the grain from falling into the space between the outer cylinder and the inner cylinder from only one direction after being discharged from the grain unloading port of the lifting pipe, thereby avoiding the grain from piling up in one position between the outer cylinder and the inner cylinder, which is not conducive to the drying of the grain.

[0019] Furthermore, a heightening cylinder is detachably fixedly provided on the top of the outer cylinder, and the bottom end of the heightening cylinder is communicated with the top end of the outer cylinder.

[0020] The beneficial effect of adopting the above further solution is that the detachable heightening cylinder can increase the grain loading volume of the dryer according to actual needs.

[0021] Furthermore, a support frame for supporting the lower cone bucket is evenly and fixedly provided at the bottom of the lower cone bucket.

[0022] The beneficial effect of adopting the above further solution is that the setting of the support frame can support the entire device, and at the same time, space for installing the driving mechanism is reserved between the bottom of the lower cone bucket and the ground.

[0023] Furthermore, the driving mechanism is a reduction motor.

[0024] The beneficial effect of adopting the above further scheme is: the driving mechanism adopts a reduction motor, the output shaft of the reduction motor is transmission-connected with the spiral lifting mechanism, and the spiral lifting mechanism is rotated to drive the grain to be lifted. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0026] Figure 2 It is a front view of the present invention;

[0027] Figure 3 is a cross-sectional view of the present invention;

[0028] Figure 4 A top view of the present invention;

[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0030] 1. Hot air furnace; 2. Second hot air duct; 3. Air regulating valve; 4. Return air duct; 5. Exhaust gas collecting chamber; 6. Outer cylinder; 7. Inner cylinder; 8. Screw elevator; 801. Screw auger; 802. Lifting pipe; 9. Grain unloading cover; 10. Moisture discharge hole; 11. First hot air duct; 12. Hot air fan; 13. Speed ​​reducer motor; 14. Grain collecting pipe; 15. Lower cone bucket; 16. Heightening cylinder; 17. First air hole; 18. Second air hole; 19. Support frame. DETAILED DESCRIPTION

[0031] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the embodiment of the present invention comprises an inner cylinder 7 with a closed top, a plurality of first air holes 17 are evenly arranged on the side wall of the inner cylinder 7, an outer cylinder 6 is arranged outside the inner cylinder 7, a plurality of second air holes 18 are evenly arranged on the side wall of the outer cylinder 6, the inner wall of the outer cylinder 6 and the outer wall of the inner cylinder 7 are arranged at intervals for accommodating grain; a lower cone hopper 15 is arranged at the bottom of the outer cylinder 6, the top of the lower cone hopper 15 is communicated with the bottom of the outer cylinder 6, a spiral lifting mechanism 8 is arranged in the lower cone hopper 15, the bottom end of the spiral lifting mechanism 8 is arranged in the bottom of the lower cone hopper 15, and the top of the spiral lifting mechanism 8 extends It extends to the top of the outer cylinder 6 and is used to transport the grain in the lower cone hopper 15 upward and then drop it between the outer cylinder 6 and the inner cylinder 7; the outer cylinder 6 is provided with an exhaust gas collecting chamber 5, and the exhaust gas collecting chamber 5 is connected with the outer cylinder 6 through the second air hole 18, and the top of the exhaust gas collecting chamber 5 is evenly provided with a plurality of moisture discharge holes 10; the bottom of the outer cylinder 6 is connected with the output end of the hot air fan 12 through the first hot air duct 11, and the input end of the hot air fan 12 is connected with the hot air furnace 1 through the second hot air duct 2; the exhaust gas collecting chamber 5 is connected with the second hot air duct 2 through the return air duct 4.

[0033] A plurality of support frames 19 or bases are provided at the bottom of the lower cone hopper 15, and the entire dryer can be movable, for example, movable wheels are provided at the bottom of the support frames 19 or the base, or the dryer can be fixed.

[0034] The first air hole 17 and the second air hole 18 have different diameters according to the different sizes of grain particles, so as to facilitate the passage of exhaust gas and prevent the passage of grain.

[0035] The upper layer of the cylinder 16 is raised to increase the grain loading volume of the dryer. The raised cylinder 16 may or may not have fine holes according to actual needs.

[0036] An air regulating valve 3 is installed on the return air duct 4. The air regulating valve 3 can be adjusted manually or the opening degree of the air regulating valve 3 can be intelligently controlled by a servo motor transmission mechanism, thereby adjusting the waste heat recovery effect by the size of the return air volume.

[0037] In the embodiment of the present invention, the spiral lifting mechanism 8 includes a lifting pipe 802, the bottom end of which is arranged at the bottom of the inner cavity of the lower cone bucket 15, and the bottom of the lifting pipe 802 is connected to the bottom of the inner cavity of the lower cone bucket 15, the top of the lifting pipe 802 extends upward to the vertical upper part of the outer cylinder 6, the lifting pipe 802 is provided with a spiral auger 801 extending along the length direction of the lifting pipe 802, and the bottom of the lower cone bucket 15 is provided with a driving mechanism for driving the spiral auger 801 to rotate. The rotation of the spiral auger 801 drives the grain falling into the lower cone bucket 15 to be transported from the lifting pipe 802 to the upper part of the outer cylinder 6 and then fall between the outer cylinder 6 and the inner cylinder 7, and then the grain is dried by hot air during the process of falling from the top of the outer cylinder 6 to the lower cone bucket 15, and finally falls into the lower cone bucket 15, and then is transported upward by the spiral auger 801 to realize cyclic drying, and this is repeated many times until the moisture content of the grain reaches the requirement, so as to realize cyclic drying of the grain and improve the drying effect.

[0038] In a preferred embodiment of the present invention, the lifting tube 802 is vertically arranged, the lifting tube 802 passes through the inner cylinder 7 and extends from the top of the inner cylinder 7, the outer wall of the lifting tube 802 is connected to the top of the inner cylinder 7, further, the axis of the lifting tube 802 coincides with the axis of the inner cylinder 7, and the top of the inner cylinder 7 is provided with a grain guiding slope. The lifting tube 802 is vertically arranged and connected to the top of the inner cylinder 7, which facilitates the fixing of the lifting tube 802, and after the grain is transported to the top of the outer cylinder 6, it can evenly fall between the outer cylinder 6 and the inner cylinder 7, avoiding the accumulation of grain in a certain place, and the setting of the grain guiding slope can avoid the accumulation of grain on the top of the inner cylinder 7, and the grain guiding slope can evenly distribute the grain falling on the top of the inner cylinder 7, thereby improving the drying effect. In an embodiment of the present invention, the shape of the grain guiding slope can be selected according to the shape of the inner cylinder 7. When the inner cylinder 7 is a square cylinder, the top of the inner cylinder 7 is a four-sided pyramid structure composed of four triangular faces, wherein each triangular face constitutes an inclined grain guiding slope. When the inner cylinder 7 is a circular cylinder, the top of the inner cylinder 7 is a conical structure, and the outer surface thereof is an arc-shaped grain guiding inclined surface.

[0039] In the embodiment of the present invention, a grain collecting pipe 14 with a closed bottom end is fixedly provided at the bottom of the lower cone bucket 15, the top of the grain collecting pipe 14 is connected to the bottom of the lower cone bucket 15, the bottom end of the lifting pipe 802 is fixedly connected to the bottom of the grain collecting pipe 14, the driving mechanism is provided on the bottom end of the grain collecting pipe 14, and the bottom side wall of the lifting pipe 802 is provided with a lifting inlet connected to the grain collecting pipe 14. The provision of the grain collecting pipe 14 can facilitate the collection of grains that fall into the lower cone bucket 15 to the lifting inlet, thereby facilitating the upward transportation of the grains.

[0040] The bottom end of the rotating shaft of the spiral auger 801 is rotatably connected to the bottom end of the grain gathering pipe 14, and the top end is rotatably connected to the grain unloading cover 9. In order to ensure the smoothness of the rotation of the spiral auger 801, the bottom end of the rotating shaft of the spiral auger 801 is preferably rotatably connected to the bottom end of the grain gathering pipe 14 via a bearing, and the top end of the rotating shaft of the spiral auger 801 is rotatably connected to the grain unloading cover 9 via a bearing.

[0041] A grain unloading cover 9 is provided at the top of the lifting pipe 802, and the bottom of the grain unloading cover 9 is open downward. A plurality of grain unloading ports connected to the grain unloading cover 9 are provided on the top side of the lifting pipe 802. The setting of the grain unloading cover 9 can prevent the grain from falling between the outer cylinder 6 and the inner cylinder 7 from only one direction after being discharged from the grain unloading port of the lifting pipe 802, thereby avoiding the accumulation of grain at a position between the outer cylinder 6 and the inner cylinder 7, which is not conducive to the drying of the grain.

[0042] In a preferred embodiment of the present invention, a heightening cylinder 16 is detachably fixedly provided at the top of the outer cylinder 6, and the bottom end of the heightening cylinder 16 is connected to the top end of the outer cylinder 6. The detachable heightening cylinder 16 can increase the grain loading volume of the dryer according to actual needs. Specifically, in order to facilitate the detachable connection between the outer cylinder 6 and the heightening cylinder 16, a first edge extending outward is provided at the top of the outer cylinder 6, and a second edge extending outward is provided at the bottom end of the heightening cylinder 16. The first edge and the second edge are relatively connected and detachably fixed by bolts.

[0043] In an embodiment of the present invention, in order to facilitate the mutual fixation between the inner cylinder 7, the outer cylinder 6 and the exhaust gas collecting chamber 5, the outer wall of the inner cylinder 7 and the inner wall of the outer cylinder 6 can be fixed by a connecting frame, and the setting of the connecting frame needs to meet the requirements of not blocking the falling of grain and avoiding the accumulation of grain between the inner wall of the outer cylinder 6 and the outer wall of the inner cylinder 7. The bottom of the exhaust gas collecting chamber 5 and the bottom of the outer cylinder 6 are fixedly connected by covering the bottom plate of the bottom of the exhaust gas collecting chamber 5, and then supported by the support frame 19.

[0044] An exhaust gas collection chamber 5 is added to the outer layer of the outer cylinder 6. The height of the exhaust gas collection chamber 5 is slightly lower than that of the outer cylinder 6. At the same time, a dehumidification hole 10 is opened at the top of the exhaust gas collection chamber 5. During the drying process, the hot air generated by the hot air furnace 1 is pressed into the inner cylinder 7 through the second hot air duct 2 and the hot air blower 12. The hot air entering the inner cylinder 7 passes through the grain layer and the outer cylinder 6 from the inner cylinder 7 to the outside under pressure and then enters the external open space for emptying. Since the height of the exhaust gas collection chamber 5 is slightly lower than the height of the drying layer, part of the exhaust gas after passing through the grain layer and the outer cylinder 6 is directly emptied, and the other part of the exhaust gas enters the exhaust gas collection chamber 5. Part of the exhaust gas in the exhaust gas collection chamber 5 enters the recovery pipeline, and the other part enters the external exhaust through the dehumidification hole 10 opened at the top of the exhaust gas collection chamber 5 for emptying. Part of the exhaust gas entering the recovery pipeline is mixed with the hot air in the second hot air duct 2 through the adjustment of the air regulating valve 3 under the negative pressure power of the hot air blower 12. The mixed hot air is pressed into the inner cylinder 7 through the hot air blower 12 to dry the grain. This cycle is repeated for many times, and the exhaust gas is continuously mixed with the hot air generated by the hot air furnace 1 and enters the dryer for drying. At the same time, the excess exhaust gas is exhausted to discharge the water vapor in the grain, thereby finally achieving the purpose of grain drying, thereby improving the thermal efficiency and reducing the heat consumption of the dryer.

[0045] The hot blast furnace 1 continuously generates hot blast and enters the inner tube 7, the recovery pipe continuously recovers part of the tail gas, and the excess tail gas is continuously discharged.

[0046] Drying process of the dryer: The grain inside the dryer is between the inner cylinder 7 and the outer cylinder 6. After being blown by hot air, it slowly moves downward and enters the lower cone bucket 15. The grain is collected in the lower cone bucket 15 and then enters the grain collecting pipe 14. The grain collecting pipe 14 is at the bottom of the spiral lifting mechanism 8. The spiral auger 801 in the spiral lifting mechanism 8 rotates at high speed through the power of the reduction motor 13. The rotating spiral auger 801 drives the grain in the grain collecting pipe 14 to enter the lifting pipe 802 and move upward until it reaches the top of the spiral auger 801. The lifting pipe 802 has a grain unloading port, and the grain enters the grain unloading cover 9 through the grain unloading port. Under the protection of the grain unloading cover 9, the grain falls vertically downward between the inner cylinder 7 and the outer cylinder 6, completing a drying cycle; then enter the next drying cycle, and repeat this many times until the moisture content of the grain reaches the requirement.

[0047] The present invention adds an exhaust gas collection chamber 5 to the outer layer, the height of which is slightly lower than that of the drying layer, and forms an exhaust gas circulation system by mixing the exhaust gas with the hot air through a recovery pipe. The exhaust gas can be mixed with the hot air generated by the hot air furnace 1 to generate new hot air for drying, thereby improving the thermal efficiency and reducing the heat consumption of the dryer, providing a new idea and model for energy saving and consumption reduction in grain drying.

[0048] In the description of the present invention, it is necessary to understand that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inside", "outside", "peripheral", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred system or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A waste heat recycling type grain dryer, characterized in that: The invention comprises an inner cylinder (7) with a closed top, a plurality of first air holes (17) being evenly arranged on the side wall of the inner cylinder (7), an outer cylinder (6) being arranged outside the inner cylinder (7), a plurality of second air holes (18) being evenly arranged on the side wall of the outer cylinder (6), the inner wall of the outer cylinder (6) being spaced apart from the outer wall of the inner cylinder (7) for accommodating grain; a lower cone bucket (15) being arranged at the bottom of the outer cylinder (6), the top of the lower cone bucket (15) being connected to the bottom of the outer cylinder (6), a spiral lifting mechanism (8) being arranged inside the lower cone bucket (15), the bottom end of the spiral lifting mechanism (8) being arranged inside the bottom of the lower cone bucket (15), the top end of the spiral lifting mechanism (8) extending to the outer cylinder ( The upper part of the outer cylinder (6) is used to transport the grain in the lower cone hopper (15) upward and then drop it between the outer cylinder (6) and the inner cylinder (7); the outer cylinder (6) is provided with an exhaust gas collection chamber (5), the exhaust gas collection chamber (5) is connected to the outer cylinder (6) through the second air hole (18), and the top of the exhaust gas collection chamber (5) is evenly provided with a plurality of moisture discharge holes (10); the bottom of the outer cylinder (6) is connected to the output end of the hot air blower (12) through the first hot air duct (11), and the input end of the hot air blower (12) is connected to the hot air furnace (1) through the second hot air duct (2); the exhaust gas collection chamber (5) is connected to the second hot air duct (2) through the return air duct (4).

2. The tail gas waste heat recycling type grain dryer according to claim 1, characterized in that: The return air duct (4) is provided with an air regulating valve (3).

3. The tail gas waste heat recycling type grain dryer according to claim 1, characterized in that: The spiral lifting mechanism (8) comprises a lifting pipe (802), the bottom end of which is arranged at the bottom of the inner cavity of the lower cone bucket (15), and the bottom of the lifting pipe (802) is connected to the bottom of the inner cavity of the lower cone bucket (15), the top end of the lifting pipe (802) extends upward to the vertical position above the outer cylinder (6), and a spiral auger (801) extending along the length direction of the lifting pipe (802) is arranged in the lifting pipe (802), and a driving mechanism for driving the spiral auger (801) to rotate is arranged at the bottom of the lower cone bucket (15).

4. The tail gas waste heat recycling type grain dryer according to claim 3, characterized in that: The lifting pipe (802) is vertically arranged, passes through the inner tube (7) and extends out from the top of the inner tube (7), and the outer wall of the lifting pipe (802) is connected to the top of the inner tube (7).

5. The tail gas waste heat recycling type grain dryer according to claim 4, characterized in that: The axis of the lifting pipe (802) coincides with the axis of the inner cylinder (7), and a grain guiding inclined surface is provided on the top of the inner cylinder (7).

6. The tail gas waste heat recycling type grain dryer according to claim 3, characterized in that: A grain collecting pipe (14) with a closed bottom end is fixedly provided at the bottom of the lower cone bucket (15); the top of the grain collecting pipe (14) is connected to the bottom of the lower cone bucket (15); the bottom end of the lifting pipe (802) is fixedly connected to the bottom of the grain collecting pipe (14); the driving mechanism is arranged on the bottom end of the grain collecting pipe (14); and a lifting inlet connected to the grain collecting pipe (14) is provided on the bottom side wall of the lifting pipe (802).

7. The tail gas waste heat recycling type grain dryer according to claim 3, characterized in that: A grain unloading cover (9) is provided at the top of the lifting pipe (802), the bottom of the grain unloading cover (9) is open downwards, and a plurality of grain unloading ports connected to the grain unloading cover (9) are provided on the top side of the lifting pipe (802).

8. The tail gas waste heat recycling type grain dryer according to any one of claims 1 to 7, characterized in that: A heightening cylinder (16) is detachably fixedly provided on the top of the outer cylinder (6), and the bottom end of the heightening cylinder (16) is communicated with the top end of the outer cylinder (6).

9. The tail gas waste heat recycling type grain dryer according to any one of claims 1 to 7, characterized in that: A support frame (19) for supporting the lower cone bucket (15) is evenly and fixedly disposed at the bottom of the lower cone bucket (15).

10. The tail gas waste heat recycling type grain dryer according to any one of claims 3 to 7, characterized in that: The driving mechanism is a reduction motor (13).

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