A waste heat recycling grain dryer

Abstract

The present invention is applicable to the technical field of waste heat utilization, and provides a waste heat reuse grain dryer, which includes a dryer body, a material receiving base, and a box body fixed on the top of the material receiving base. At the bottom of one side of the box body, an air inlet pipe communicated with the inner cavity of the box body is fixed, and at the bottom of one side of the box body, an air outlet pipe communicated with the inner cavity of the box body is fixed. At the top of the box body, a feeding buffer box with an upper cover is fixed. Inside the box body, a vibration support structure is fixedly installed. A number of diversion plates are fixed at positions above and below the vibration support structure inside the box body. A number of heat exchange tube assemblies penetrating through the diversion plates are fixedly installed on the vibration support structure. A gas guiding groove, and an installation through hole cooperating with the heat exchange tube assembly are provided on each of the number of diversion plates. The present invention solves the technical problem that the waste heat of the hot grain particles after drying is not utilized, improves the overall energy utilization efficiency, and further reduces the energy consumption during the grain drying process.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat utilization, and more specifically, it relates to a waste heat reuse grain dryer. Background Art

[0002] During the grain drying process, devices such as hot blast stoves or air source heat pumps generate a large amount of heat to evaporate the moisture in the grains. However, these heats are often dissipated into the atmosphere in the form of waste gas and waste heat after drying, resulting in a waste of energy. Effectively utilizing the waste heat generated by the grain dryer can not only improve the energy utilization efficiency, but also reduce the drying cost and environmental pollution.

[0003] Currently, some waste heat utilization methods of grain dryers on the market include: flue gas waste heat utilization, exhaust gas waste heat utilization, and air source heat pump waste heat recovery. The recovered flue gas waste heat can be used to preheat the air entering the dryer, increase the temperature of the hot air, thereby accelerating the drying speed and reducing energy consumption; the recovered exhaust gas waste heat can be used to preheat the grains entering the dryer, increase the initial temperature of the grains, which helps to accelerate the drying speed; the recovered waste heat can be used to heat the fresh air entering the dryer, increase the temperature of the hot air, and reduce energy consumption. The above-mentioned waste heat recovery and utilization are relatively perfect, but there is still a large part of the waste heat that has not been utilized during the grain drying process.

[0004] Different grains have different drying temperatures, and the temperatures of the grains when discharged are also different. The appearance of wheat is relatively soft, with larger capillary pores, and the moisture is easily evaporated. During the drying process, the hot air temperature for wheat drying is generally controlled at about 80°C, and the temperature of the wheat after drying is between 40 - 45°C; corn has a large embryo, contains more starch, and the pericarp structure of the grain is tight and smooth, which has a great resistance to the outward movement of internal moisture. The hot air temperature for corn drying is generally between 100°C - 110°C, and the temperature of the corn kernels after drying is about 50°C. And in the prior art, there is no technical solution to reuse the heat contained in the dried grain particles, resulting in a waste of energy.

[0005] The grain drying process includes four stages: preheating, moisture gasification, tempering, and cooling. Among them, the cooling stage is to cool the dried grains to room temperature for easy storage and transportation. Usually, normal temperature or low temperature air is introduced to quickly cool the grains. During this process, cooling not only consumes a certain amount of time, but also the waste heat contained in the dried grains themselves is completely wasted and not reasonably utilized. Therefore, in view of the above technical problems, the present invention proposes a waste heat reuse grain dryer. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a waste heat reuse grain dryer that can reuse the heat contained in the dried grain particles.

[0007] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0008] The present invention relates to a waste heat recycling grain dryer, which includes a dryer body, a material receiving base, and a box body fixed on the top of the material receiving base. At the bottom of one side of the box body, an air inlet pipe communicating with the inner cavity of the box body is fixed, and at the bottom of one side of the box body, an air outlet pipe communicating with the inner cavity of the box body is fixed. A feeding buffer box with an upper cover is fixed on the top of the box body. A vibration support structure is fixedly installed inside the box body. A plurality of diversion plates are fixed at positions above and below the vibration support structure inside the box body. A plurality of heat exchange tube assemblies penetrating the diversion plates are fixedly installed on the vibration support structure. A gas guiding groove and an installation through hole cooperating with the heat exchange tube assembly are provided on each of the plurality of diversion plates.

[0009] The heat exchange tube assembly includes an outer heat exchange tube and an inner heat exchange tube coaxially arranged inside the outer heat exchange tube. A material feeding gap is formed between the inner wall of the outer heat exchange tube and the outer wall of the inner heat exchange tube. At both ends of the outer heat exchange tube, telescopic hoses for communicating with the inner cavities of the material receiving base and the feeding buffer box are fixed. One end of the telescopic hose away from the outer heat exchange tube is fixedly connected to the material receiving base and the feeding buffer box by screws.

[0010] As a preferred technical solution of the present invention, the vibration support structure includes a support plate penetrated by the outer heat exchange tube and fixedly connected to the outer heat exchange tube. The support plate is fixedly installed inside the box body through a mounting rod. Two elastic sleeves are sleeved on the mounting rod. A vibration pump is installed at the center of the support plate. Air guiding holes are provided on the support plate.

[0011] As a preferred technical solution of the present invention, a fixed frame cooperating with the support plate is fixed inside the box body. One end of one elastic sleeve abuts against the fixed frame and the other end abuts against the support plate. One end of the other elastic sleeve abuts against the support plate and the other end abuts against the adjusting cap of the mounting rod.

[0012] As a preferred technical solution of the present invention, the inner heat exchange tube includes a main hollow tube and a plurality of conical expansion tubes. The plurality of conical expansion tubes are coaxially and equidistantly fixed on the main hollow tube. The conical expansion tubes communicate with the inner cavity of the main hollow tube. Both ends of the main hollow tube respectively abut against the telescopic hoses. The telescopic hose is composed of a corrugated pipe and flanges located at both ends of the telescopic corrugated pipe. A support frame cooperating with the main hollow tube is fixed inside one of the flanges. The flange away from the outer heat exchange tube is fixedly connected to the material receiving base and the feeding buffer box by bolts.

[0013] As a preferred technical solution of the present invention, an exhaust pipe and a gas transmission pipe communicating with the inner cavity of the main hollow tube are fixed at the bottom of the main hollow tube. The end of the gas transmission pipe located inside the main hollow tube extends to the inner top of the main hollow tube. Solenoid valves are installed at both ends of the exhaust pipe and the gas transmission pipe located outside the main hollow tube.

[0014] As a preferred technical solution of the present invention, the drainage plates are all inclined in one direction and are fixedly installed inside the box body by screws. The inclination angle of the drainage plates inside the box body is 15°-45°. The air guide grooves formed on adjacent drainage plates are arranged in a staggered manner, and the installation through holes formed on the drainage plates are matched with the outer heat exchange tubes.

[0015] As a preferred technical solution of the present invention, the width of the blanking gap formed between the inner wall of the outer heat exchange tube and the outer wall of the inner heat exchange tube is 5-8 mm larger than the particle size of the dried grains.

[0016] As a preferred technical solution of the present invention, the drainage plates are evenly distributed above and below the support plate.

[0017] As a preferred technical solution of the present invention, a blanking port communicating with the telescopic hose is formed at the bottom of the blanking buffer box. A plurality of arc-shaped diversion covers are fixed to the inner bottom of the blanking buffer box. The bottom of the blanking buffer box is fixedly connected to the telescopic hose by bolts.

[0018] As a preferred technical solution of the present invention, the material receiving base includes a storage box communicated with the telescopic hose through a top feeding port. The top of the storage box is fixedly connected to the telescopic hose by bolts. A spiral discharge fan blade is installed inside the storage box. A discharge pipe communicated with the inner cavity of the storage box and matched with the spiral discharge fan blade is fixed to the bottom of one end of the storage box. A driving mechanism drivingly connected to the spiral discharge fan blade is installed at the other end of the storage box.

[0019] The advantages of the present invention are as follows:

[0020] The present invention heats the air inside the box body through the heat exchange tube assembly with the heat contained in the warm grains after drying by the grain dryer. The heated air can preheat the fresh air that needs to be dried or the waste heat of the grains, improving the overall energy utilization efficiency and further reducing the energy consumption during the grain drying process. By recovering and utilizing the waste heat of the grain particles after drying, the demand for additional heat sources can be reduced, thereby reducing the energy consumption and cost during the drying process.

[0021] The present invention forms a blanking gap by arranging an inner heat exchange tube along its axis inside the outer heat exchange tube. The dried hot grains pass through the blanking gap in the form of a thin layer, enabling the dried hot grains to fully contact the surfaces of the outer heat exchange tube and the inner heat exchange tube, improving the heat exchange efficiency and further enhancing the utilization efficiency of the waste heat of the dried hot grains.

[0022] The present invention effectively avoids the blockage of grains inside the outer heat exchange tube when the dried grains pass through the blanking gap between the outer heat exchange tube and the inner heat exchange tube by setting a vibration support structure with a vibration function, ensuring that the dried grains can smoothly pass through the outer heat exchange tube. Brief Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of a waste heat recycling grain dryer according to the present invention.

[0024] Figure 2 It is a schematic structural diagram of another perspective of the present invention.

[0025] Figure 3 It is a schematic cross-sectional structural diagram of the front view of the present invention.

[0026] Figure 4 It is a schematic cross-sectional structural diagram of the left view of the present invention.

[0027] Figure 5 It is a schematic structural diagram of the cooperation between the heat exchange tube assembly and the vibration support structure.

[0028] Figure 6 It is Figure 5 a schematic structural diagram of another perspective.

[0029] Figure 7 It is Figure 5 a schematic cross-sectional structural diagram of

[0030] Figure 8 It is a schematic structural diagram of the cooperation between the outer heat exchange tube and the inner heat exchange tube.

[0031] Figure 9 It is a schematic structural diagram of the inner heat exchange tube.

[0032] Figure 10 It is a schematic cross-sectional structural diagram of the inner heat exchange tube.

[0033] Figure 11 It is a schematic structural diagram of the vibration support structure.

[0034] Figure 12 It is a schematic structural diagram of another perspective of the vibration support structure.

[0035] Figure 13 It is a schematic structural diagram of the arrangement of several drainage plates inside the box.

[0036] Figure 14 It is a schematic structural diagram of the cooperation between the material receiving base and the telescopic hose.

[0037] Figure 15 It is a schematic internal structural diagram of the telescopic hose.

[0038] Figure 16 It is a schematic structural diagram of the blanking buffer box.

[0039] Figure 17 It is a schematic cross-sectional structural diagram of the box.

[0040] Figure 18 It is a schematic structural diagram of the dryer main body.

[0041] Figure 19 It is the front view of the dryer main body.

[0042] In the attached drawings: 1. Material receiving base; 101. Storage box; 102. Screw discharge fan blade; 103. Discharge pipe; 104. Driving mechanism;

[0043] 2. Box body; 3. Air inlet pipe; 4. Air outlet pipe; 5. Upper cover;

[0044] 6. Feeding buffer box; 601. Feeding port; 602. Arc-shaped diversion cover;

[0045] 7. Vibration support structure; 701. Support plate; 702. Installation rod; 703. Elastic sleeve; 704. Vibration pump; 705. Air guide hole;

[0046] 8. Drainage plate; 801. Air guide groove; 802. Installation through hole;

[0047] 9. Heat exchange tube assembly; 901. Outer heat exchange tube; 902. Inner heat exchange tube; 9021. Main hollow tube; 9022. Conical expansion tube; 9023. Exhaust pipe; 9024. Gas transmission pipe; 903. Telescopic hose;

[0048] 10. Gas collecting pipe. Specific embodiments

[0049] The principles and features of the present invention will be described below with reference to the attached drawings. The examples given are only for explaining the present invention and are not used to limit the scope of the present invention. In the following paragraphs, the present invention will be described more specifically by way of example with reference to the attached drawings. It should be noted that the attached drawings are all in a very simplified form and use non-precise scales, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0050] It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items. Embodiment 1:

[0052] Please refer to Figures 1 - 19 the structural schematic diagram, and the present invention provides the following technical solutions:

[0053] Specifically, it refers to a waste heat recycling grain dryer, which includes a dryer body, a receiving base 1, and a box body 2 fixed on the top of the receiving base 1. An air inlet pipe 3 communicating with the inner cavity of the box body 2 is fixed at the bottom of one side of the box body 2, and an air outlet pipe 4 communicating with the inner cavity of the box body 2 is fixed at the bottom of one side of the box body 2. A feeding buffer box 6 with an upper cover 5 is fixed on the top of the box body 2. A vibration support structure 7 is fixedly installed inside the box body 2. A plurality of flow guiding plates 8 are fixed at positions above and below the vibration support structure 7 inside the box body 2. A plurality of heat exchange tube assemblies 9 penetrating through the flow guiding plates 8 are fixedly installed on the vibration support structure 7;

[0054] A plurality of air guiding grooves 801 and installation through holes 802 matching with the heat exchange tube assemblies 9 are formed on each of the plurality of flow guiding plates 8. The plurality of flow guiding plates 8 are all inclined in one direction. The flow guiding plates 8 are fixedly installed inside the box body 2 by screws. The inclination angle of the flow guiding plates 8 inside the box body 2 is 15° - 45°. The inclination angle of 15° - 45° can ensure that the cold air introduced therein has sufficient residence time inside the box body 2, further improving the absorption rate of the waste heat of the dried hot grains. The air guiding grooves 801 formed on adjacent two flow guiding plates are arranged in a staggered manner, so that the cold air advances in a zigzag shape inside the box body 2, increasing the contact time with the outer heat exchange tube 901 of the waste heat and improving the heat absorption efficiency. The installation through holes 802 formed on the flow guiding plates 8 are matched with the outer heat exchange tubes 901, and the plurality of flow guiding plates 8 are evenly distributed above and below the support plate 701.

[0055] The heat exchange tube assembly 9 includes an outer heat exchange tube 901 and an inner heat exchange tube 902 coaxially arranged inside the outer heat exchange tube 901. A feeding gap is formed between the inner wall of the outer heat exchange tube 901 and the outer wall of the inner heat exchange tube 902. The width of the feeding gap formed between the inner wall of the outer heat exchange tube 901 and the outer wall of the inner heat exchange tube 902 is larger than the particle size of the dried grains by 5-8 mm. The width of the feeding gap is slightly larger than the particle size of the grain particles, so that the grain particles can pass through the feeding gap. At the same time, the grain particles will not be out of contact with the inner wall of the outer heat exchange tube 901 and the inner heat exchange tube 902 due to the gap being too large. Both ends of the outer heat exchange tube 901 are fixed with telescopic hoses 903 for connecting the material receiving base 1 and the inner cavity of the material receiving buffer box 6. The telescopic hose 903 plays a role of flexible connection and does not hinder the vibration of the outer heat exchange tube 901. The end of the telescopic hose 903 away from the outer heat exchange tube 901 is fixedly connected to the material receiving base 1 and the material receiving buffer box 6 by screws.

[0056] The bottom of the material discharging buffer box 6 is provided with a discharging port 601 connected to the telescopic hose 903, and a plurality of arc-shaped flow guide covers 602 are fixed to the bottom of the material discharging buffer box 6, and the bottom of the material discharging buffer box 6 is fixedly connected to the telescopic hose 903 by bolts. The arc-shaped flow guide covers 602 enable the grains input into the material discharging buffer box 6 to slide to the discharging port 601 under the action of their own gravity, thereby reducing the residue of grains.

[0057] The receiving base 1 includes a storage box 101 connected to the telescopic hose 903 through a top feed port, the top of the storage box 101 is fixedly connected to the telescopic hose 903 by bolts, a spiral discharge fan blade 102 is installed in the storage box 101, a discharge pipe 103 connected to the inner cavity of the storage box 101 and matched with the spiral discharge fan blade 102 is fixed at the bottom of one end of the storage box 101, and a driving mechanism 104 connected to the spiral discharge fan blade 102 is installed at the other end of the storage box 101. The driving mechanism 104 is composed of a reducer and a motor. The power output by the motor drives the spiral discharge fan blade 102 to rotate in the storage box 101 after passing through the reducer, and the cooled grain particles are transported out of the storage box 101, thereby improving the discharge efficiency.

[0058] The working principle of the waste heat recycling grain dryer provided by the present invention is as follows:

[0059] Working principle: Fresh air is input into the box 2 through the air inlet pipe 3, and the hot grain particles dried in the grain dryer are output through the bottom outlet (such as Figure 19As shown in the figure, it is then input into the blanking buffer box 6 under the action of the lifting bucket, and enters the outer heat exchange tube 901 through the blanking port 601 at the bottom of the blanking buffer box 6 and the telescopic hose 903. The dried hot grain particles pass through the blanking gap. At this time, the dried hot grain particles come into contact with the inner wall of the outer heat exchange tube 901. The dried hot grain particles exchange heat with the air entering the interior of the box 2 through the outer heat exchange tube 901. As the air flows from bottom to top inside the box 2, the air is gradually heated to a temperature close to that of the hot grain particles (while the temperature of the grain particles passing through the outer heat exchange tube 901 drops to a temperature close to that of the incoming air). The grain particles passing through the outer heat exchange tube 901 enter the storage box 101 through the telescopic hose 903 below and are temporarily stored in the storage box 101. When needed, the driving mechanism 104 drives the spiral discharge fan blade 102 to output the cooled grain particles. Embodiment 2:

[0060] Based on the specific Embodiment 1, the difference in this embodiment is:

[0061] As Figure 5 , Figure 11 , Figure 12 As shown in the figure, the vibration support structure 7 includes a support plate 701 penetrated by the outer heat exchange tube 901 and fixedly connected to the outer heat exchange tube 901. The support plate 701 is fixedly installed inside the box 2 through the mounting rod 702 (the mounting rod 702 penetrates the support plate 701 and is in sliding contact with the support plate 701. Under the constraint of the mounting rod 702, the support plate 701 can only move up and down). Two elastic sleeves 703 are sleeved on the mounting rod 702. A vibration pump 704 is installed at the center of the support plate 701, and air guide holes 705 are provided on the support plate 701.

[0062] A fixed frame matching the support plate 701 is fixed inside the box 2. One end of one elastic sleeve 703 abuts against the fixed frame and the other end abuts against the support plate 701, and one end of the other elastic sleeve 703 abuts against the support plate 701 and the other end abuts against the adjusting cap of the mounting rod 702. The setting of the two elastic sleeves 703 can play a role in shock absorption and noise reduction.

[0063] Start the vibration pump 704. The support plate 701 vibrates up and down under the constraint of the mounting rod 702, and then drives the heat exchange tube assembly 9 installed thereon to vibrate up and down, so that the grain particles can smoothly pass through the blanking gap between the outer heat exchange tube 901 and the inner heat exchange tube 902, avoiding blockage of the grain in the outer heat exchange tube 901. Embodiment 3:

[0064] Based on the specific Embodiment 2, the difference in this embodiment is:

[0065] As Figures 7 - 10As shown in the figure, the internal heat exchange tube 902 includes a main hollow tube 9021 and a number of conical expansion tubes 9022. The number of conical expansion tubes 9022 are coaxially and equidistantly fixed on the main hollow tube 9021. The conical expansion tubes 9022 communicate with the inner cavity of the main hollow tube 9021. Both ends of the main hollow tube 9021 are tightly abutted against the telescopic hose 903. The telescopic hose 903 is composed of a corrugated pipe and flanges located at both ends of the telescopic corrugated pipe. A support frame matching the main hollow tube 9021 is fixed inside one of the flanges. One flange away from the external heat exchange tube 901 is fixedly connected to the feeding base 1 and the blanking buffer box 6 through bolts. The structure of the conical expansion tubes 9022 in the internal heat exchange tube 902 increases the heat exchange area. In addition, the blanking gap formed by the cooperation of the external heat exchange tube 901 and the internal heat exchange tube 902 enables the dried hot grains to pass through only in a single layer or with a relatively thin thickness. The synergistic effect of the two further improves the waste heat recovery efficiency.

[0066] An exhaust pipe 9023 and an air delivery pipe 9024 that communicate with the inner cavity of the main hollow tube 9021 are fixed to the bottom of the main hollow tube 9021. The end of the air delivery pipe 9024 located inside the main hollow tube 9021 extends to the inner top of the main hollow tube 9021 (the temperature of the inhaled fresh air is relatively low, and it can gradually squeeze the hot air downward from the top of the main hollow tube 9021, which helps to discharge the hot air). Solenoid valves are installed at both ends of the exhaust pipe 9023 and the air delivery pipe 9024 located outside the main hollow tube 9021. When the solenoid valve at the air inlet end of the air delivery pipe 9024 is opened, the air delivery pipe 9024 can inhale the external air into the cavity formed by the main hollow tube 9021 and the conical expansion tubes 9022. A number of exhaust pipes 9023 are connected in sequence and finally penetrate through the feeding base 1. The end of the exhaust pipe 9023 located outside the feeding base 1 is connected to the same gas collecting pipe 10. The gas collecting pipe 10 inputs the heated hot air into the drying furnace or preheats the fresh air entering the dryer, and can simultaneously conduct heat exchange in two directions in cooperation with the external heat exchange tube 901, further utilizing the heat of the dried hot grain particles.

[0067] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements, or modifications made based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are all covered by the protection scope of the present invention.

Claims

1. A waste heat recycling grain dryer, comprising a dryer body, a material receiving base (1) and a box (2) fixed on the top of the material receiving base (1), an air inlet pipe (3) connected to the inner cavity of the box (2) fixed to the bottom of one side of the box (2), and an air outlet pipe (4) connected to the inner cavity of the box (2) fixed to the bottom of one side of the box (2), characterized in that: A material unloading buffer box (6) with an upper cover (5) is fixed on the top of the box body (2); a vibration support structure (7) is fixedly installed inside the box body (2); a plurality of guide plates (8) are fixed inside the box body (2) and at positions above and below the vibration support structure (7); and a plurality of heat exchange tube assemblies (9) that penetrate the guide plates (8) are fixedly installed on the vibration support structure (7); A plurality of the guide plates (8) are provided with air guide grooves (801) and mounting through holes (802) that cooperate with the heat exchange tube assembly (9); The heat exchange tube assembly (9) comprises an outer heat exchange tube (901) and an inner heat exchange tube (902) coaxially arranged inside the outer heat exchange tube (901); a material discharge gap is formed between the inner wall of the outer heat exchange tube (901) and the outer wall of the inner heat exchange tube (902); telescopic hoses (903) for connecting to the inner cavity of the material receiving base (1) and the material discharge buffer box (6) are fixed at both ends of the outer heat exchange tube (901); the end of the telescopic hose (903) away from the outer heat exchange tube (901) is fixedly connected to the material receiving base (1) and the material discharge buffer box (6) by means of screws.

2. The waste heat recycling grain dryer according to claim 1, characterized in that: The vibration support structure (7) comprises a support plate (701) penetrated by an external heat exchange tube (901) and fixedly connected to the external heat exchange tube (901); the support plate (701) is fixedly mounted inside the box body (2) via a mounting rod (702); two sections of elastic sleeves (703) are sleeved on the mounting rod (702); a vibration pump (704) is mounted at the center of the support plate (701); and an air guide hole (705) is provided on the support plate (701).

3. The waste heat recycling grain dryer according to claim 2, characterized in that: A fixed frame cooperating with the support plate (701) is fixed inside the box body (2), wherein one end of an elastic sleeve (703) is pressed against the fixed frame and the other end is pressed against the support plate (701), and another end of an elastic sleeve (703) is pressed against the support plate (701) and the other end is pressed against the adjustment cap of the mounting rod (702).

4. The waste heat recycling grain dryer according to claim 1, characterized in that: The inner heat exchange tube (902) comprises a main hollow tube (9021) and a plurality of tapered expansion tubes (9022); the plurality of tapered expansion tubes (9022) are coaxially and equidistantly fixed on the main hollow tube (9021); the tapered expansion tubes (9022) are connected to the inner cavity of the main hollow tube (9021); and both ends of the main hollow tube (9021) are respectively pressed against the telescopic hose (903); The telescopic hose (903) is composed of a bellows and flanges located at both ends of the telescopic bellows, wherein a support frame that cooperates with the main hollow tube (9021) is fixed inside one of the flanges, and a flange away from the external heat exchange tube (901) is fixedly connected to the material receiving base (1) and the material discharge buffer box (6) by bolts.

5. The waste heat recycling grain dryer according to claim 4, characterized in that: An exhaust pipe (9023) and an air supply pipe (9024) which are in communication with the inner cavity of the main hollow pipe (9021) are fixed at the bottom of the main hollow pipe (9021); one end of the air supply pipe (9024) located inside the main hollow pipe (9021) extends to the top of the main hollow pipe (9021); and one end of the exhaust pipe (9023) and the air supply pipe (9024) located outside the main hollow pipe (9021) are both equipped with solenoid valves.

6. The waste heat recycling grain dryer according to claim 1, characterized in that: The plurality of guide plates (8) are all arranged to be inclined in one direction, the guide plates (8) are fixedly mounted inside the box body (2) by means of screws, the guide plates (8) are arranged to be inclined at an angle of 15° to 45° inside the box body (2), the air guide grooves (801) provided on two adjacent guide plates are arranged to be staggered, and the mounting through holes (802) provided on the guide plates (8) cooperate with the external heat exchange tubes (901).

7. The waste heat recycling grain dryer according to claim 1, characterized in that: The width of the material feeding gap formed between the inner wall of the outer heat exchange tube (901) and the outer wall of the inner heat exchange tube (902) is greater than the particle size of the dried grains by 5-8 mm.

8. The waste heat recycling grain dryer according to claim 1, characterized in that: A plurality of guide plates (8) are evenly distributed above and below the support plate (701).

9. The waste heat recycling grain dryer according to claim 1, characterized in that: The bottom of the material unloading buffer box (6) is provided with a material unloading port (601) connected to the telescopic hose (903), a plurality of arc-shaped flow guide covers (602) are fixed to the bottom of the material unloading buffer box (6), and the bottom of the material unloading buffer box (6) is fixedly connected to the telescopic hose (903) by bolts.

10. The waste heat recycling grain dryer according to claim 1, characterized in that: The material receiving base (1) comprises a storage box (101) connected to a telescopic hose (903) via a top material feed port, the top of the storage box (101) being fixedly connected to the telescopic hose (903) via bolts, a spiral discharge fan blade (102) being installed in the storage box (101), a discharge pipe (103) connected to the inner cavity of the storage box (101) and cooperating with the spiral discharge fan blade (102) being fixed at the bottom of one end of the storage box (101), and a driving mechanism (104) being transmission-connected to the spiral discharge fan blade (102) being installed at the other end of the storage box (101).

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