Grain dryer with online dust removal and hot air circulation function

Abstract

The utility model discloses a kind of grain drying machines with online dust removal and hot air circulation function, comprising: tower dryer, it has hot air mouth and waste heat outlet;Hot blast furnace, its hot air outlet is communicated with hot air mouth by hot blast pipe;Exhaust fan, its air intake and waste heat outlet are communicated by exhaust pipe, the outlet of exhaust fan is connected with exhaust pipe;Dust removal device, its inlet is communicated with exhaust pipe;Three-way reversing pipe, its first pipe mouth is communicated with the outlet of dust removal device, the second pipe mouth of three-way reversing pipe is communicated with the hot blast furnace hearth of hot blast furnace by backflow pipe, the third pipe mouth of three-way reversing pipe is connected with ash pipe;Three-way reversing pipe is equipped with movable damper mechanism, for controlling the on-off of first pipe mouth and second pipe mouth, and controlling the on-off of first pipe mouth and third pipe mouth.The drying machine can reuse waste heat, and energy-saving effect is good, and the impurity dust in waste heat can be filtered by using dust removal device, and the quality of grain is improved.

Description

Technical Field

[0001] This utility model relates to the field of drying equipment technology, and more specifically to a grain dryer with online dust removal and hot air circulation functions. Background Technology

[0002] Modern grain dryers (such as CN221666521U, a type of sun-drying grain dryer), regardless of whether they are mixed-flow, cross-flow, continuous, or batch vertical models, all use a direct heating method for roasting. This means that hot air generated by a hot air blower, under negative pressure, enters the dryer's hot chamber from the inlet, passes through the grain layer in the middle chamber, and roasts the grain. During the drying process, humid heat is released, which, along with straw, dust, and other debris, is discharged into the waste air chamber. There, an exhaust fan located outside the waste air chamber draws the waste heat away and discharges it to the ash chamber. Statistics show that waste heat accounts for 30% of the incoming air heat. Therefore, the waste heat from existing dryers is not reused, resulting in a 15-25% increase in energy consumption.

[0003] In addition, a new type of static chamber grain drying equipment has been launched on the market. It heats the room temperature in the drying chamber to the required temperature through a heat source. The drying chamber and the hot air furnace are connected through air inlet and outlet channels to achieve hot air circulation. During the circulation process, the hot air carries fibrous dust, which poses a safety hazard. Its dust removal device is installed on the top of the elevator. Although there is a centrifugal motor and pipes for dust collection, it cannot effectively remove the dust scattered in the large drying chamber. This causes the dust to stick to the surface of the grains, changing the original color of the grains, which is extremely unpopular.

[0004] Therefore, how to provide a more energy-efficient grain dryer with high grain quality and online dust removal and hot air circulation functions is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the present invention provides a grain dryer with online dust removal and hot air circulation functions that is more energy-efficient and produces higher quality grains.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A grain dryer with online dust removal and hot air circulation functions includes:

[0008] A tower dryer, wherein the bottom side of the tower dryer has a hot air inlet and a waste heat outlet;

[0009] A hot air furnace is placed outside the tower dryer, and the hot air outlet of the hot air furnace is connected to the hot air inlet through a hot air pipe.

[0010] An exhaust fan is placed outside the tower dryer. The exhaust port of the exhaust fan is connected to the waste heat outlet through an exhaust pipe, and the outlet of the exhaust fan is connected to an exhaust pipe.

[0011] A dust removal device, wherein the inlet of the dust removal device is connected and communicates with the outlet of the exhaust pipe away from the exhaust fan;

[0012] A three-way reversing pipe is provided, wherein the first port of the three-way reversing pipe is connected to the outlet of the dust removal device and is centrally connected, the second port of the three-way reversing pipe is connected to the hot air furnace of the hot air furnace through a return pipe, and the third port of the three-way reversing pipe is connected to an ash discharge pipe, the end of which is connected to an ash discharge room.

[0013] The three-way reversing pipe is equipped with a movable damper mechanism for controlling the opening and closing of the first pipe port and the second pipe port, as well as the opening and closing of the first pipe port and the third pipe port.

[0014] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a grain dryer with online dust removal and hot air circulation functions. During grain drying, the movable damper mechanism controls the connection between the first and second pipe ports and blocks the connection between the first and third pipe ports. The hot air generated by the hot air furnace enters the tower dryer through the hot air pipe and hot air inlet to dry the grain. The moisture, straw, dust and waste heat generated during the drying process are drawn into the exhaust fan through the waste heat outlet and exhaust pipe. Then, the hot air enters the exhaust pipe through the exhaust fan outlet and is filtered by the dust removal device. The filtered hot air enters the second pipe port of the three-way reversing pipe and flows back to the hot air furnace of the hot air furnace through the return pipe to mix with the hot air and enter the tower dryer again, thereby realizing the reuse of waste heat and achieving energy saving. In addition, during the reuse of waste heat hot air, the straw and dust in the waste heat are filtered by the filtration device, so that the reused waste heat is clean hot air, reducing the adhesion of dust on the surface of the grains during the drying process and improving the quality of the grains. When the grains reach the inspection standards, the hot air furnace automatically stops operating, ceasing to supply heat to the tower dryer. However, the exhaust fan continues to run, removing the remaining damp air and residual heat, as well as dust and debris stagnating in the corners of the tower dryer. At this time, the movable damper mechanism controls the connection between the first and third pipe ports and blocks the connection between the first and second pipe ports, thus opening the ash discharge channel. This allows the extracted residual damp air and residual heat, as well as dust and debris stagnating in the corners, to be discharged into the ash discharge room through the ash discharge pipe. The ash is completely removed in about an hour. At the same time, all the grains in the tower dryer are cooled to room temperature, at which point the exhaust fan is turned off, and the entire operation is completed.

[0015] Furthermore, the dust removal device includes:

[0016] The dust removal pipe has one end connected to and communicates with the port on the exhaust pipe away from the exhaust fan, and the other end connected to and communicates with the first port of the three-way reversing pipe.

[0017] A filter screen is installed inside the dust removal pipe to filter out grass, debris, and dust from the waste heat.

[0018] Furthermore, the filter screen has a first state and a second state. In the first state, it filters out grass, debris, and dust in the residual heat, while in the second state, it does not filter out grass, debris, and dust in the residual heat.

[0019] The beneficial effects of adopting the above technical solution are as follows: When the grain is dried, the filter screen is in the first state, which can filter the circulating residual heat and remove grass, dust and other debris from the residual heat. When the grain is dried to the inspection standard and it is necessary to continue to discharge the remaining moisture, residual heat and impurities in the tower dryer, the filter screen is in the second state. At this time, the filter screen does not perform the filtering function, so that the remaining moisture, residual heat and impurities can be quickly discharged through the ash discharge pipe.

[0020] Furthermore, in the first state, the filter screen is arranged at an angle in the dust removal pipe, wherein the upper end of the filter screen abuts against the upper edge of one end of the dust removal pipe and the lower end of the filter screen abuts against the lower edge of the other end of the dust removal pipe; in the second state, the filter screen is arranged horizontally in the dust removal pipe.

[0021] The beneficial effects of adopting the above technical solution are: the filter screen is arranged at an angle, which has a larger filtration area than the vertically arranged filter screen, thus improving the filtration effect.

[0022] Furthermore, the dust removal device also includes a drive mechanism for driving the filter screen to switch back and forth between a first state and a second state.

[0023] Furthermore, the drive mechanism includes:

[0024] A rotating shaft is rotatably connected at both ends to two opposite pipe walls of the dust removal pipe, and the rotating shaft is fixedly connected to the crossbeam on the filter screen.

[0025] A drive arm is located on one side of the dust removal pipe, and one end of the drive arm is fixedly connected to one end of the rotating shaft.

[0026] A drive cylinder is disposed on one side of the outer wall of the dust removal pipe, and the telescopic end of the drive cylinder is hinged to the other end of the drive arm.

[0027] The beneficial effects of adopting the above technical solution are: the extension and retraction of the drive cylinder can drive the drive arm to swing, thereby causing the drive arm to drive the rotating shaft to rotate, realizing the switching between the tilt and horizontal states of the filter screen.

[0028] Furthermore, the filter screen is equipped with a vibration pump for shaking off weeds and dust adhering to the filter screen.

[0029] The beneficial effect of adopting the above technical solution is to avoid the filter screen being clogged by impurities, thus affecting the filtration effect.

[0030] Furthermore, an ash outlet is provided on the bottom wall of the dust removal pipe near the low end of the filter screen, and a ash discharge straight pipe is fixed at the bottom end of the three-way reversing pipe. One end of the ash discharge straight pipe is connected to and communicates with the ash outlet, and the ash discharge port at the other end of the ash discharge straight pipe communicates with the inner cavity of the ash discharge pipe.

[0031] The beneficial effects of adopting the above technical solution are as follows: the grass, debris and dust shaken off by the vibration pump are pushed by the residual air and enter the ash discharge straight pipe through the ash outlet. After entering the ash discharge pipe, it is directly discharged into the ash discharge room, thereby cleaning up the shaken grass, debris and dust and avoiding the problem of blockage caused by accumulation in the dust removal pipe.

[0032] Furthermore, the movable damper mechanism includes:

[0033] A door hinge is rotatably mounted at the second port of the three-way reversing pipe. A movable damper is fixed on the door hinge, and a push-pull plate is fixed at the upper end of the door hinge.

[0034] A damper control cylinder is located at the top of the three-way reversing pipe, and the telescopic end of the damper control cylinder is hinged to the push-pull plate.

[0035] The beneficial effects of adopting the above technical solution are: the damper control cylinder drives the push-pull plate to swing, thereby realizing the active damper to block the third or second pipe opening, realizing the connection between the first and second pipe openings respectively, ensuring that the waste heat of purification flows into the hot air furnace through the return pipe for reuse, and realizing the connection between the first and third pipe openings, ensuring that the remaining hot air, dust and impurities in the tower dryer are directly discharged through the ash discharge pipe.

[0036] Furthermore, limit blocks are fixed on the top and bottom walls of the three-way reversing pipe, and the movable damper can abut against the limit blocks.

[0037] The beneficial effects of adopting the above technical solution are: when the movable damper abuts against the limit block, the movable damper can just block the third pipe opening, avoiding excessive movement of the movable damper under the drive of the damper control cylinder, which would lead to problems such as jamming between the movable damper and the inner wall of the three-way reversing pipe, damage to the movable damper, and abnormal noise. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0039] Figure 1 This is a first-view structural schematic diagram of a grain dryer with online dust removal and hot air circulation functions provided by this utility model.

[0040] Figure 2 This is a second-view structural schematic diagram of a grain dryer with online dust removal and hot air circulation functions provided by this utility model.

[0041] Figure 3 This is a top view of a grain dryer with online dust removal and hot air circulation functions provided by this utility model.

[0042] Figure 4 A first-person perspective schematic diagram of the assembly of the exhaust fan, dust removal device, three-way reversing pipe, return pipe, and movable damper mechanism.

[0043] Figure 5 A second-view schematic diagram of the assembly of the exhaust fan, dust removal device, three-way reversing pipe, return pipe, and movable damper mechanism.

[0044] Figure 6 for Figure 5 A magnified schematic diagram of the structure of part A in the middle.

[0045] Figure 7 A third-view schematic diagram of the assembly of the dust removal device, the three-way reversing pipe, the return pipe, and the movable damper mechanism.

[0046] Figure 8 for Figure 7 A magnified schematic diagram of the structure of part B in the middle.

[0047] Figure 9 A schematic diagram from the first perspective of a 3-way reversing pipe with a ash discharge straight pipe installed.

[0048] Figure 10 for Figure 9 A magnified schematic diagram of the structure of part C in the middle.

[0049] Figure 11 A schematic diagram from a second perspective showing a straight ash discharge pipe installed on a three-way reversing pipe.

[0050] Figure 12 for Figure 11 A magnified schematic diagram of the structure of part D in the middle. Detailed Implementation

[0051] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0052] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0055] See Figures 1-12 This utility model discloses a grain dryer with online dust removal and hot air circulation functions, comprising:

[0056] Tower dryer 1, with a hot air inlet 101 and a waste heat outlet 102 on one side of the bottom;

[0057] Hot air furnace 2 is placed outside the tower dryer 1. The hot air outlet 201 and the hot air inlet 101 of the hot air furnace 2 are connected through the hot air pipe 3.

[0058] Exhaust fan 4 is placed outside the tower dryer 1. The exhaust port 401 of the exhaust fan 4 is connected to the waste heat outlet 102 through the exhaust pipe 5. The outlet of the exhaust fan 4 is connected to the exhaust pipe 6.

[0059] Dust removal device 7, the inlet of dust removal device 7 is connected and communicated with the pipe opening on exhaust pipe 6 that is away from exhaust fan 4;

[0060] The three-way reversing pipe 8 has a first port 81 connected to the outlet of the dust removal device 7 and is in communication with it. The second port 82 of the three-way reversing pipe 8 is connected to the hot air furnace of the hot air furnace 2 through the return pipe 9. The third port 83 of the three-way reversing pipe 8 is connected to the ash discharge pipe 10, and the end of the ash discharge pipe 10 is connected to the ash discharge room.

[0061] The three-way reversing pipe 8 is equipped with a movable damper mechanism 11, which is used to control the opening and closing of the first pipe port 81 and the second pipe port 82, and to control the opening and closing of the first pipe port 81 and the third pipe port 83.

[0062] See details Figure 8 As shown, the dust removal device 7 includes:

[0063] Dust removal pipe 71, one end of dust removal pipe 71 is connected to and communicates with the pipe port on exhaust pipe 6 that is away from exhaust fan 4, and the other end of dust removal pipe 71 is connected to and communicates with the first pipe port 81 of three-way reversing pipe 8.

[0064] Filter screen 72 is installed inside dust removal pipe 71 and is used to filter grass, debris and dust in waste heat.

[0065] The filter screen 72 has a first state and a second state. In the first state, it filters grass, debris and dust in the residual heat, and in the second state, it does not filter grass, debris and dust in the residual heat.

[0066] In the first state, the filter screen 72 is arranged at an angle in the dust removal pipe 71, wherein the high end of the filter screen 72 abuts against the upper edge of one end of the dust removal pipe 71, and the low end of the filter screen 72 abuts against the lower edge of the other end of the dust removal pipe 71; in the second state, the filter screen 72 is arranged horizontally in the dust removal pipe 71.

[0067] The dust removal device 7 also includes a drive mechanism 73 for driving the filter screen 72 to switch back and forth between a first state and a second state.

[0068] The drive mechanism 73 includes:

[0069] The rotating shaft 731 is rotatably connected at both ends to the two opposite pipe walls of the dust removal pipe 71, and the rotating shaft 731 is fixedly connected to the crossbeam 721 on the filter screen 72.

[0070] Drive arm 732 is located on one side of dust removal pipe 71, and one end of drive arm 732 is fixedly connected to one end of rotating shaft 731.

[0071] The drive cylinder 733 is installed on the outer wall of one side of the dust removal pipe 71, and the extension end of the drive cylinder 733 is hinged to the other end of the drive arm 732.

[0072] In some embodiments of this utility model, the filter screen 72 is provided with a vibration pump 12 for shaking off weeds and dust attached to the filter screen 72.

[0073] In other embodiments, a dust outlet 711 is provided on the bottom wall of the dust removal pipe 71 near the lower end of the filter screen 72, and a dust discharge straight pipe 13 is fixed at the bottom end of the three-way reversing pipe 8. One end of the dust discharge straight pipe 13 is connected to and communicates with the dust outlet 711, and the dust discharge port 131 at the other end of the dust discharge straight pipe 13 communicates with the inner cavity of the dust discharge pipe 10.

[0074] In some embodiments, the movable damper mechanism 11 includes:

[0075] Door hinge 111 is rotatably set at the second port of the three-way reversing pipe 8. A movable damper 112 is fixed on the door hinge 111, and a push-pull plate 113 is fixed at the upper end of the door hinge 111.

[0076] The damper control cylinder 114 is located at the top of the three-way reversing pipe 8, and the telescopic end of the damper control cylinder 114 is hinged to the push-pull plate 113.

[0077] In this embodiment, limit blocks 84 are fixed on the top and bottom walls of the three-way reversing pipe 8, and the movable damper 112 can abut against the limit blocks 84.

[0078] The tower dryer 1 of this utility model is existing technology. For its specific structure, please refer to publication number CN221666521U, entitled "A Sun-drying Grain Dryer." It internally includes a hot air chamber, a drying chamber, and a waste heat chamber. Multiple layers of drying pipes are arranged vertically within the drying chamber. The hot air chamber is connected to the hot air outlet 201 of the hot air furnace 2 via a hot air pipe 3 through a hot air inlet 101. The waste heat outlet 102 of the waste heat chamber is connected to the exhaust port 401 of the exhaust fan 4 via an exhaust pipe 5. Grain is dried in a thin layer by being spread out and air-dried in the tower dryer 1 through the multiple layers of drying pipes, thus doubling the drying area. This changes the existing dryer's process of dense grain drying, high-temperature baking, and tempering layer cooling, achieving a low-temperature drying effect and ensuring that the nutritional components of the grain are not destroyed.

[0079] The working process of this utility model is as follows: Under normal operating conditions, the drive cylinder 733 drives the filter screen 72 to be in a first state of inclined arrangement via the drive arm 732, and the damper control cylinder 114 drives the movable damper 112 to abut against the limit block 84 via the push-pull plate 113. Figure 6 At the position indicated by the dotted line, the movable damper 112 blocks the passage from the first port 81 of the three-way reversing pipe 8 to the third port 83, preventing the waste hot air flowing in after being filtered by the filter screen 72 from being discharged through the ash discharge pipe 10. It also opens the passage from the first port 81 of the three-way reversing pipe 8 to the second port 82, allowing the hot air drawn from the tower dryer 1 by the exhaust fan 4 to be filtered by the filter screen 72 in the first state and then returned to the furnace of the hot air furnace 2 through the return pipe 9 for reuse, achieving energy saving. In addition, the vibration pump 12 can promptly shake the straw dust attached to the filter screen 72 to the bottom of the dust removal pipe 71 and discharge it through the ash outlet 711 and the ash discharge straight pipe 13 directly to the ash discharge pipe 10. When the grain moisture meter (not shown) installed on the tower dryer 1 indicates that the moisture content has reached the inspection standard, the hot air furnace 2 automatically stops operating, ceasing the supply of hot air to the tower dryer 1. However, the exhaust fan 4 continues to run, removing the remaining humid air and residual heat, as well as dust and debris trapped in the corners of the tower dryer 1. At this time, the drive cylinder 733, through the drive arm 732, causes the filter screen 72 to be in a horizontal arrangement, a second state. The damper control cylinder 114, through the push-pull plate 113, drives the movable damper 112 to close the second pipe port 82, opening the passage from the first pipe port 81 to the third pipe port 83, and opening the ash discharge passage. See Figure 6 As shown, the remaining residual heat, dust, and debris can be directly discharged into the ash discharge room through the ash discharge pipe 10. It is completely removed in about an hour. At the same time, the grain in the tower dryer 1 is cooled to room temperature. Then the exhaust fan 4 is turned off, and all operations are completed. This achieves a low-temperature (50 degrees Celsius) and rapid (14 hours) drying effect, saving 40% of fuel. Moreover, the dust and other impurities generated during the drying process are filtered and removed online through a filter screen, thus ensuring the quality of the grain.

[0080] This invention eliminates safety hazards because the hot air returning to the hot air furnace has undergone online dust removal, preventing the inclusion of dust and other impurities. The dryer not only removes dust and impurities online and recycles the remaining hot air, but also uses multi-layered drying pipes to thinly spread the grains, mimicking sun-drying. This allows the grains entering the dryer to achieve rapid, low-temperature (48 degrees Celsius) drying, saving energy and protecting the environment. It is the best choice for grain drying worldwide and contributes to the Zero Hunger Project proposed by the World Food and Oil Organization.

[0081] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0082] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A grain dryer with online dust removal and hot air circulation functions, characterized in that, include: A tower dryer (1) has a hot air inlet (101) and a waste heat outlet (102) on one side of its bottom. Hot air furnace (2), the hot air furnace (2) is placed outside the tower dryer (1), and the hot air outlet (201) of the hot air furnace (2) is connected to the hot air inlet (101) through a hot air pipe (3); The exhaust fan (4) is located outside the tower dryer (1). The exhaust port (401) of the exhaust fan (4) is connected to the waste heat outlet (102) through the exhaust pipe (5). The outlet of the exhaust fan (4) is connected to the exhaust pipe (6). Dust removal device (7), the inlet of the dust removal device (7) is connected and communicated with the pipe opening on the exhaust pipe (6) away from the exhaust fan (4); A three-way reversing pipe (8) is provided, with its first port (81) connected to and communicating with the outlet of the dust removal device (7), its second port (82) communicating with the hot air furnace chamber of the hot air furnace (2) through a return pipe (9), and its third port (83) connected to an ash discharge pipe (10), the end of which is connected to an ash discharge room. The three-way reversing pipe (8) is provided with a movable damper mechanism (11) for controlling the opening and closing of the first pipe port (81) and the second pipe port (82), and controlling the opening and closing of the first pipe port (81) and the third pipe port (83).

2. A grain dryer with online dust removal and hot air circulation functions according to claim 1, characterized in that, The dust removal device (7) includes: Dust removal pipe (71), one end of the dust removal pipe (71) is connected and communicated with the pipe opening on the exhaust pipe (6) away from the exhaust fan (4), and the other end of the dust removal pipe (71) is connected and communicated with the first pipe opening (81) of the three-way reversing pipe (8); A filter screen (72) is installed inside the dust removal pipe (71) to filter grass, debris and dust in the waste heat.

3. A grain dryer with online dust removal and hot air circulation functions according to claim 2, characterized in that, The filter (72) has a first state and a second state. In the first state, it filters grass, debris and dust in the residual heat, and in the second state, it does not filter grass, debris and dust in the residual heat.

4. A grain dryer with online dust removal and hot air circulation functions according to claim 3, characterized in that, In the first state, the filter screen (72) is arranged at an angle in the dust removal pipe (71), wherein the upper end of the filter screen (72) abuts against the upper edge of one end of the dust removal pipe (71), and the lower end of the filter screen (72) abuts against the lower edge of the other end of the dust removal pipe (71); in the second state, the filter screen (72) is arranged horizontally in the dust removal pipe (71).

5. A grain dryer with online dust removal and hot air circulation functions according to claim 4, characterized in that, The dust removal device (7) also includes a drive mechanism (73) for driving the filter screen (72) to switch back and forth between a first state and a second state.

6. A grain dryer with online dust removal and hot air circulation functions according to claim 5, characterized in that, The drive mechanism (73) includes: A rotating shaft (731) is rotatably connected at both ends to the two opposite pipe walls of the dust removal pipe (71), and the rotating shaft (731) is fixedly connected to the crossbeam (721) on the filter screen (72); A drive arm (732) is located on one side of the dust removal pipe (71), and one end of the drive arm (732) is fixedly connected to one end of the rotating shaft (731); A drive cylinder (733) is disposed on the outer wall of one side of the dust removal pipe (71), and the extension end of the drive cylinder (733) is hinged to the other end of the drive arm (732).

7. A grain dryer with online dust removal and hot air circulation functions according to any one of claims 4-6, characterized in that, The filter screen (72) is equipped with a vibrating pump (12) for shaking off weeds and dust attached to the filter screen (72).

8. A grain dryer with online dust removal and hot air circulation functions according to claim 7, characterized in that, The dust removal pipe (71) has an ash outlet (711) located on the bottom wall near the low end of the filter screen (72). The bottom end of the three-way reversing pipe (8) is fixed with a ash discharge straight pipe (13). One end of the ash discharge straight pipe (13) is connected to and communicates with the ash outlet (711). The ash discharge port (131) at the other end of the ash discharge straight pipe (13) communicates with the inner cavity of the ash discharge pipe (10).

9. A grain dryer with online dust removal and hot air circulation functions according to any one of claims 1-6 and 8, characterized in that, The movable damper mechanism (11) includes: A door hinge (111) is rotatably mounted at the second port of the three-way reversing pipe (8). A movable damper (112) is fixed on the door hinge (111), and a push-pull plate (113) is fixed at the upper end of the door hinge (111). A damper control cylinder (114) is located on the top of the three-way reversing pipe (8), and the telescopic end of the damper control cylinder (114) is hinged to the push-pull plate (113).

10. A grain dryer with online dust removal and hot air circulation functions according to claim 9, characterized in that, Limiting blocks (84) are fixed on the top and bottom inner walls of the three-way reversing pipe (8), and the movable damper (112) can abut against the limiting blocks (84).

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