Hot air pipeline device of grain dryer

Abstract

The utility model relates to a hot air pipeline device of a grain dryer, and belongs to the field of grain drying. Comprising at least one elbow pipeline, at least one straight pipeline, an adjusting pipeline, a plurality of connecting flanges and a plurality of fixing mechanisms, the connecting flanges are arranged at the two ends of the elbow pipeline, the two ends of the straight pipeline and the two ends of the adjusting pipeline respectively, the elbow pipeline, the straight pipeline and the adjusting pipeline are assembled through the connecting flanges and the fixing mechanism to form a hot air pipeline, and the two ends of the hot air pipeline are connected with hot air generating equipment and a draught fan respectively. According to the utility model, the hot air pipeline with the corresponding length can be assembled according to the actual height of the grain dryer, the application range is widened, and meanwhile, the air pipe is installed according to the actual situation on site, and the collision deformation and scratch of the air pipe can be reduced in the transportation process of the air pipe.

Description

Technical Field

[0001] The utility model relates to the field of grain drying, in particular to a hot air duct device of a grain dryer. Background Art

[0002] The hot air duct of a grain drying tower is a duct that sends dry hot air into the interior of the drying tower, which has the characteristics of fast speed, high efficiency and safety, and is mainly made of materials with high temperature resistance and corrosion resistance.

[0003] The traditional hot air duct has the disadvantages of large heat loss and high energy consumption. Moreover, the workpiece of the hot air duct is large, and there are problems that the surface anti-corrosion layer is easily scratched during the transportation process, and the universality problem of the duct. For different dryers, the duct needs to be designed separately. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a hot air duct device of a grain dryer to solve the above problems.

[0005] The technical solution of the utility model to solve the above technical problems is as follows: A hot air duct device of a grain dryer includes: at least one elbow duct, at least one straight duct, an adjustment duct, a plurality of connecting flanges and a plurality of fixing mechanisms; both ends of the elbow duct, the straight duct and the adjustment duct are provided with the connecting flanges, and the elbow duct, the straight duct and the adjustment duct are assembled into a hot air duct through the connecting flanges and the fixing mechanisms, and both ends of the hot air duct are respectively connected with a hot air generating device and a fan.

[0006] The beneficial effect of the utility model is that the elbow duct, the straight duct and the adjustment duct are conducive to assembling a hot air duct with a corresponding length according to the actual height of the grain dryer through the connecting flanges and the fixing mechanisms, improving the applicable range. At the same time, on-site installation according to the actual situation is also conducive to reducing the bump deformation and scratching of the air duct during the transportation process.

[0007] On the basis of the above technical solution, the utility model can also be improved as follows.

[0008] Further, the elbow duct and the straight duct are connected through the connecting flanges and the fixing mechanisms, one end of the adjustment duct is connected with the elbow duct or the straight duct through the connecting flanges and the fixing mechanisms, the other end of the adjustment duct is connected with the fan, and when there are multiple straight ducts, the multiple straight ducts are connected through the connecting flanges and the fixing mechanisms.

[0009] The beneficial effects of adopting the above further solution are as follows: It is beneficial to assemble the elbow pipe, straight pipe, and adjustment pipe into an air duct through connecting flanges and fixing mechanisms according to the actual situation on site.

[0010] Further, the elbow pipe includes: a plurality of elbow outer plates, a plurality of elbow thermal insulation rock wools, a plurality of elbow air duct wall plates, and a plurality of elbow angle steels; both the elbow outer plate and the elbow air duct wall plate are composed of two arc-shaped plate structures and two sector-shaped plate structures. The elbow thermal insulation rock wool is filled between the elbow outer plate and the elbow air duct wall plate. One elbow outer plate, one elbow thermal insulation rock wool, and one elbow air duct wall plate form a set of elbow pipe side plates. Multiple sets of the elbow pipe side plates are wound to form an arc-shaped tubular structure. Adjacent sets of the elbow pipe side plates are adaptively connected through the elbow angle steel. The elbow outer plate and the elbow air duct wall plate are respectively the outer wall and the inner wall of the arc-shaped tubular structure.

[0011] The beneficial effects of adopting the above further solution are as follows: The elbow outer plate, the elbow air duct wall plate, and the elbow angle steel are beneficial for providing space for the installation of the elbow thermal insulation rock wool. The elbow thermal insulation rock wool is beneficial for reducing heat loss, lowering energy consumption, and not burning, improving the safety during use. The elbow angle steel is beneficial for strengthening the overall strength of the elbow pipe.

[0012] Further, the two connecting flanges respectively arranged at both ends of the arc-shaped tubular structure are arranged at a 90-degree angle in space.

[0013] The beneficial effects of adopting the above further solution are as follows: It is beneficial for the formed air duct to form a 90-degree bend angle in space, improving the applicability of the air duct.

[0014] Further, the straight pipe includes: a plurality of straight outer plates, a plurality of straight thermal insulation rock wools, a plurality of straight air duct wall plates, and a plurality of first straight angle steels; both the straight outer plate and the straight air duct wall plate are plate-shaped structures. The straight thermal insulation rock wool is filled between the straight outer plate and the straight air duct wall plate. One straight outer plate, one straight thermal insulation rock wool, and one straight air duct wall plate form a set of straight pipe side plates. Multiple sets of the straight pipe side plates are wound to form a vertical tubular structure. Adjacent sets of the straight pipe side plates are adaptively connected through the first straight angle steel. The straight outer plate and the straight air duct wall plate are respectively the outer wall and the inner wall of the vertical tubular structure.

[0015] The beneficial effects of adopting the above further solution are as follows: The straight outer plate, the straight air duct wall plate, and the straight angle steel are beneficial for providing space for the installation of the straight thermal insulation rock wool. The straight thermal insulation rock wool is beneficial for reducing heat loss, lowering energy consumption, and not burning, improving the safety during use. The first straight angle steel is beneficial for strengthening the overall strength of the straight pipe.

[0016] Furthermore, the straight pipe further includes a plurality of second straight angle steels, and adjacent two of the first straight angle steels are vertically connected by the second straight angle steels.

[0017] The beneficial effect of adopting the above further scheme is that the second straight angle steel is beneficial to further enhancing the overall strength of the straight pipe.

[0018] Furthermore, the adjusting pipe is of a tubular structure, and its shape is adapted to the shape of the end of the arc-shaped tubular structure formed by winding a plurality of the elbow pipe side plates and the shape of the end of the vertical tubular structure formed by winding a plurality of the straight pipe side plates.

[0019] The beneficial effect of adopting the above further scheme is that it is beneficial to ensure that during the process of forming an integral air duct by the elbow pipe, the straight pipe and the adjusting pipe, the two connected by the connecting flange and the fixing mechanism can be assembled adaptively, and have good sealing performance after assembly.

[0020] Furthermore, the connecting flange is formed by connecting a plurality of flange monomers end to end, and the shape formed by connecting a plurality of the flange monomers end to end is adapted to the ends of the elbow pipe, the straight pipe and the adjusting pipe. The flange monomer includes a first connecting area and a second connecting area. The first connecting area is a plate-like structure with a U-shaped longitudinal section, and the second connecting area is a plate-like structure vertically connected to one side of the open end of the first connecting area.

[0021] The beneficial effect of adopting the above further scheme is that the first connecting area is beneficial to closing the sides of the elbow pipe side plate and the straight pipe side plate, avoiding the dissipation of hot air inside the pipe, and the second connecting area is beneficial to fixedly installing the connecting flange on the elbow pipe, the straight pipe and the adjusting pipe.

[0022] Furthermore, in the two connecting flanges for connecting the elbow pipe and the straight pipe, the adjusting pipe and the elbow pipe or the adjusting pipe and the straight pipe, and adjacent two straight pipes, one end of the first connecting area on the two flange monomers far from the second connecting area is connected by the fixing mechanism, and the second connecting area is connected to the elbow outer plate, the straight outer plate and the side wall of the adjusting pipe by the fixing mechanism.

[0023] The beneficial effect of adopting the above further scheme is that it is beneficial to enable the elbow pipe and the straight pipe, the adjusting pipe and the elbow pipe, or the adjusting pipe and the straight pipe, and adjacent two straight pipes to be assembled into an air duct adapted to the grain dryer through the connecting flange and the fixing mechanism.

[0024] Furthermore, the fixing mechanism is a self-tapping screw.

[0025] The beneficial effects of adopting the above further solution are as follows: The self-tapping screws facilitate connecting and fixing each component when assembling the air duct on-site according to the actual situation, improving the convenience of on-site operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 An exploded view of the elbow pipe provided by an embodiment of the present invention;

[0027] Figure 2 An exploded view of the straight pipe provided by an embodiment of the present invention;

[0028] Figure 3 An exploded view of the adjustable pipe provided by an embodiment of the present invention;

[0029] Figure 4 A front view of the elbow pipe provided by an embodiment of the present invention;

[0030] Figure 5 A front view of the straight pipe provided by an embodiment of the present invention;

[0031] Figure 6 A front view of the adjustable pipe provided by an embodiment of the present invention;

[0032] Figure 7 A schematic diagram of the overall structure of the connecting flange provided by an embodiment of the present invention;

[0033] Figure 8 A side view of the flange monomer provided by an embodiment of the present invention;

[0034] Figure 9 A schematic diagram showing two flange monomers connecting and fixing the side plates of two adjacent elbow pipes provided by an embodiment of the present invention.

[0035] In the drawings, the list of components represented by each reference numeral is as follows:

[0036] 1, elbow pipe; 2, straight pipe; 3, adjustable pipe; 4, connecting flange; 5, fixing mechanism; 11, elbow outer plate; 12, elbow thermal insulation rock wool; 13, elbow air duct wall plate; 14, elbow angle steel; 21, straight outer plate; 22, straight thermal insulation rock wool; 23, straight air duct wall plate; 24, first straight angle steel; 25, second straight angle steel; 41, first connection area; 42, second connection area. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The principles and features of the present invention will be described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0038] As Figures 1 to 9As shown in the figure, a hot air duct device for a grain dryer includes: at least one elbow duct 1, at least one straight duct 2, an adjustment duct 3, a plurality of connecting flanges 4, and a plurality of fixing mechanisms 5; both ends of the elbow duct 1, the straight duct 2, and the adjustment duct 3 are provided with the connecting flanges 4, and the elbow duct 1, the straight duct 2, and the adjustment duct 3 are assembled into a hot air duct through the connecting flanges 4 and the fixing mechanisms 5, and both ends of the hot air duct are respectively connected to a hot air generating device and a fan.

[0039] The beneficial effects of the present utility model are: the elbow duct, the straight duct, and the adjustment duct are beneficial to assembling a hot air duct with a corresponding length according to the actual height of the grain dryer through the connecting flanges and the fixing mechanisms, improving the scope of application. At the same time, on-site installation according to the actual situation is also beneficial to reducing the bump deformation and scratching of the air duct during the transportation process.

[0040] Preferably, the elbow duct 1 and the straight duct 2 are connected through the connecting flange 4 and the fixing mechanism 5, one end of the adjustment duct 3 is connected to the elbow duct 1 or the straight duct 2 through the connecting flange 4 and the fixing mechanism 5, and the other end of the adjustment duct 3 is connected to the fan. When there are multiple straight ducts 2, the multiple straight ducts 2 are connected through the connecting flange 4 and the fixing mechanism 5.

[0041] The beneficial effect of adopting the above preferred solution is: it is beneficial to assemble the elbow duct, the straight duct, and the adjustment duct into an air duct through the connecting flanges and the fixing mechanisms according to the actual situation on site.

[0042] Preferably, as Figure 1 and Figure 4 shown, the elbow duct 1 includes: a plurality of elbow outer plates 11, a plurality of elbow heat-insulating rock wools 12, a plurality of elbow air duct wall plates 13, and a plurality of elbow angle steels 14; both the elbow outer plates 11 and the elbow air duct wall plates 13 are two arc-shaped plate structures and two fan-shaped plate structures, the elbow heat-insulating rock wool 12 is filled between the elbow outer plates 11 and the elbow air duct wall plates 13, one elbow outer plate 11, one elbow heat-insulating rock wool 12, and one elbow air duct wall plate 13 form a group of elbow pipe side plates, and multiple groups of elbow pipe side plates are wound to form an arc-shaped tubular structure. Adjacent two groups of elbow pipe side plates are adaptively connected through the elbow angle steel 14, and the elbow outer plates 11 and the elbow air duct wall plates 13 are respectively the outer wall and the inner wall of the arc-shaped tubular structure.

[0043] The beneficial effects of adopting the above preferred solution are as follows: The outer wrapping plate of the elbow, the duct wall plate of the elbow, and the angle steel of the elbow are conducive to providing space for the installation of the heat-insulating rock wool of the elbow. The heat-insulating rock wool of the elbow is conducive to reducing heat loss, lowering energy consumption, and is non-combustible, improving the safety during use. The angle steel of the elbow is conducive to enhancing the overall strength of the elbow pipe.

[0044] Preferably, as Figure 4 shown, the two connecting flanges 4 respectively arranged at both ends of the arc-shaped tubular structure are arranged at a 90-degree angle in space.

[0045] The beneficial effects of adopting the above preferred solution are as follows: It is conducive to forming a 90-degree bend angle of the duct in space, improving the applicability of the duct.

[0046] Preferably, as Figure 2 and Figure 5 shown, the straight-through pipe 2 includes: a plurality of straight-through outer wrapping plates 21, a plurality of straight-through heat-insulating rock wools 22, a plurality of straight-through duct wall plates 23, and a plurality of first straight-through angle steels 24; both the straight-through outer wrapping plate 21 and the straight-through duct wall plate 23 are plate-shaped structures. The straight-through heat-insulating rock wool 22 is filled between the straight-through outer wrapping plate 21 and the straight-through duct wall plate 23. One straight-through outer wrapping plate 21, one straight-through heat-insulating rock wool 22, and one straight-through duct wall plate 23 form a group of straight-through pipe side plates. Multiple groups of straight-through pipe side plates are wound to form a vertical tubular structure. Adjacent two groups of straight-through pipe side plates are adaptively connected through the first straight-through angle steel 24. The straight-through outer wrapping plate 21 and the straight-through duct wall plate 23 are respectively the outer wall and the inner wall of the vertical tubular structure.

[0047] The beneficial effects of adopting the above preferred solution are as follows: The straight-through outer wrapping plate, the straight-through duct wall plate, and the straight-through angle steel are conducive to providing space for the installation of the straight-through heat-insulating rock wool. The straight-through heat-insulating rock wool is conducive to reducing heat loss, lowering energy consumption, and is non-combustible, improving the safety during use. The first straight-through angle steel is conducive to enhancing the overall strength of the straight-through pipe.

[0048] Preferably, as Figure 2 shown, the straight-through pipe 2 further includes a plurality of second straight-through angle steels 25. Adjacent two first straight-through angle steels 24 are vertically connected through the second straight-through angle steel 25.

[0049] The beneficial effects of adopting the above preferred solution are as follows: The second straight-through angle steel is conducive to further enhancing the overall strength of the straight-through pipe.

[0050] Preferably, as Figure 3 and Figure 6As shown, the adjustment duct 3 is a tubular structure, and its shape is adapted to the shape of the end of the arc-shaped tubular structure formed by winding a plurality of the elbow duct side plates and the shape of the end of the vertical tubular structure formed by winding a plurality of the straight duct side plates.

[0051] It should be noted that: in the technical solution of the present utility model, since the adjustment duct 3 is short, the influence on energy loss is small, and on-site cutting is required. To reduce the installation complexity and cost, the adjustment duct 3 is not provided with thermal insulation rock wool and outer cladding.

[0052] The beneficial effect of adopting the above preferred solution is: it is beneficial to ensure that the two connected by the connecting flange and the fixing mechanism can be assembled adaptively during the process of forming the overall air duct by the elbow duct, the straight duct and the adjustment duct, and have good sealing performance after assembly.

[0053] Preferably, as Figure 7 and Figure 8 shown, the connecting flange 4 is formed by connecting a plurality of flange monomers end to end. The shape formed by connecting a plurality of flange monomers end to end is adapted to the ends of the elbow duct 1, the straight duct 2 and the adjustment duct 3. The flange monomer includes a first connection area 41 and a second connection area 42. The first connection area 41 is a plate-like structure with a U-shaped longitudinal section, and the second connection area 42 is a plate-like structure perpendicularly connected to one side of the open end of the first connection area 41.

[0054] The beneficial effect of adopting the above preferred solution is: the first connection area is beneficial to enclose the sides of the elbow duct side plate and the straight duct side plate to avoid the dissipation of hot air inside the duct, and the second connection area is beneficial to fixedly install the connecting flange on the elbow duct, the straight duct and the adjustment duct.

[0055] Preferably, as Figure 9 shown, among the two connecting flanges 4 for connecting the elbow duct 1 and the straight duct 2, the adjustment duct 3 and the elbow duct 1 or the adjustment duct 3 and the straight duct 2, and between two adjacent straight ducts 2, one end of the first connection area 41 on the two flange monomers far from the second connection area 42 is connected by the fixing mechanism 5, and the second connection area 42 is connected to the elbow outer cladding 11, the straight outer cladding 21 and the side wall of the adjustment duct 3 by the fixing mechanism 5.

[0056] The beneficial effect of adopting the above preferred solution is: it is beneficial to enable the elbow duct and the straight duct, between the adjustment duct and the elbow duct, or between the adjustment duct and the straight duct, and between two adjacent straight ducts to be assembled into an air duct adapted to the grain dryer through the connecting flange and the fixing mechanism.

[0057] Preferably, the fixing mechanism 5 is a self-tapping screw.

[0058] The beneficial effects of adopting the above preferred solution are as follows: The self-tapping screw facilitates the connection and fixation of each component during the on-site assembly of the air duct according to the actual situation, improving the convenience of on-site operation.

[0059] The assembly process of the present utility model will be described below through an embodiment:

[0060] As Figures 1 to 9 shown, after the drying tower body is installed, the hot air pipeline is installed.

[0061] The elbow insulation rock wool 12 is evenly stuffed into the framework composed of the elbow air duct wall panel 13, the connecting flange 4 and the elbow angle steel 14, and the elbow outer wrapping plate 11 is used to cover the elbow insulation rock wool 12, and then the elbow outer wrapping plate 11 is fixed to the second connection area 42 in the connecting flange 4 with self-tapping screws, realizing the assembly of the elbow pipeline 1;

[0062] Similarly, the straight-through insulation rock wool 22 is evenly stuffed into the framework composed of the straight-through air duct wall panel 23, the connecting flange 4 and the first straight-through angle steel 24, and the straight-through outer wrapping plate 21 is used to cover the straight-through insulation rock wool 22, and then the straight-through outer wrapping plate 21 is fixed to the second connection area 42 in the connecting flange 4 with self-tapping screws, realizing the assembly of the straight-through pipeline 2.

[0063] The straight-through pipeline 2 and the elbow pipeline 1 are assembled according to actual requirements, and then the adjustment pipeline 3 is installed at the end of the pipeline formed by the straight-through pipeline 2 and the elbow pipeline 1. In this process, the elbow pipeline 1 and the straight-through pipeline 2, the adjustment pipeline 3 and the elbow pipeline 1 or the adjustment pipeline 3 and the straight-through pipeline 2, and between two adjacent straight-through pipelines 2 are connected by two adjacent connecting flanges 4, thus forming a hot air pipeline adapted to the on-site grain dryer;

[0064] The hot air pipeline is assembled and installed on the tower body, the length of the adjustment pipeline 3 is cut according to actual requirements, and after cutting, the connecting flange 4 is welded to the cut end of the adjustment pipeline 3, that is, the end of the adjustment pipeline 3 far from the elbow pipeline 1 or the straight-through pipeline 2. Finally, a fan is installed on this connecting flange 4, and the hot air pipeline installation is completed.

[0065] The interlayer of the hot air pipeline of the present utility model is made of insulation rock wool, which has the advantages of reducing energy consumption and non-combustibility; adopting modular standard air ducts is beneficial to processing, transportation and installation; it has a wide range of applications and can flexibly adjust the length of the air duct according to actual situations; the insulation rock wool and the outer wrapping plate are installed on-site, which is beneficial to the transportation of the air duct and reduces the bumps, deformations and scratches generated during transportation.

[0066] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0067] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0068] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0069] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0070] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. 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, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0071] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A hot air duct device for a grain dryer, characterized in that: include: At least one elbow pipeline (1), at least one straight pipeline (2), a regulating pipeline (3), a plurality of connecting flanges (4) and a plurality of fixing mechanisms (5); The elbow pipe (1), the straight pipe (2) and the regulating pipe (3) are each provided with the connecting flange (4) at both ends; the elbow pipe (1), the straight pipe (2) and the regulating pipe (3) are assembled through the connecting flange (4) and the fixing mechanism (5) to form a hot air pipe; and the two ends of the hot air pipe are respectively connected to the hot air generating device and the fan.

2. The hot air duct device of a grain dryer according to claim 1, characterized in that: The elbow pipe (1) and the straight pipe (2) are connected via the connecting flange (4) and the fixing mechanism (5); one end of the regulating pipe (3) is connected to the elbow pipe (1) or the straight pipe (2) via the connecting flange (4) and the fixing mechanism (5); the other end of the regulating pipe (3) is connected to the fan; and when there are multiple straight pipes (2), the multiple straight pipes (2) are connected via the connecting flange (4) and the fixing mechanism (5).

3. The hot air duct device of a grain dryer according to claim 1, characterized in that: The elbow pipeline (1) comprises: a plurality of elbow outer covering plates (11), a plurality of elbow thermal insulation rock wool (12), a plurality of elbow air duct wall plates (13) and a plurality of elbow angle steels (14); The elbow outer covering plate (11) and the elbow air duct wall plate (13) are both two arc-shaped plate structures and two fan-shaped plate structures. The elbow thermal insulation rock wool (12) is filled and arranged between the elbow outer covering plate (11) and the elbow air duct wall plate (13). One elbow outer covering plate (11), one elbow thermal insulation rock wool (12) and one elbow air duct wall plate (13) form a group of elbow tube side plates. Multiple groups of elbow tube side plates are arranged around to form an arc-shaped tubular structure. Two adjacent groups of elbow tube side plates are adaptively connected by the elbow angle steel (14). The elbow outer covering plate (11) and the elbow air duct wall plate (13) are respectively the outer wall and the inner wall of the arc-shaped tubular structure.

4. The hot air duct device of a grain dryer according to claim 3, characterized in that: The two connecting flanges (4) respectively arranged at the two ends of the arc-shaped tubular structure are arranged at 90 degrees in space.

5. The hot air duct device of a grain dryer according to claim 3, characterized in that: The straight-through pipeline (2) comprises: a plurality of straight-through outer covering plates (21), a plurality of straight-through thermal insulation rock wool (22), a plurality of straight-through ventilation duct wall plates (23) and a plurality of first straight-through angle steels (24); The straight outer package plate (21) and the straight ventilation duct wall plate (23) are both plate-like structures; the straight thermal insulation rock wool (22) is filled and arranged between the straight outer package plate (21) and the straight ventilation duct wall plate (23); one straight outer package plate (21), one straight thermal insulation rock wool (22) and one straight ventilation duct wall plate (23) form a group of straight duct side plates; a plurality of groups of straight duct side plates are wound around to form a vertical tubular structure; two adjacent groups of straight duct side plates are adaptively connected via the first straight angle steel (24); the straight outer package plate (21) and the straight ventilation duct wall plate (23) are respectively the outer wall and the inner wall of the vertical tubular structure.

6. The hot air duct device of a grain dryer according to claim 5, characterized in that: The straight-through pipeline (2) further comprises a plurality of second straight-through angle steels (25), and two adjacent first straight-through angle steels (24) are vertically connected via the second straight-through angle steels (25).

7. The hot air duct device of a grain dryer according to claim 5, characterized in that: The regulating pipe (3) is a tubular structure, and its shape is compatible with the shape of the end of the arc-shaped tubular structure formed by winding multiple sets of elbow pipe side plates and the shape of the end of the vertical tubular structure formed by winding multiple sets of straight pipe side plates.

8. The hot air duct device of a grain dryer according to claim 5, characterized in that: The connecting flange (4) is formed by connecting a plurality of flange monomers end to end. The shape formed by connecting a plurality of flange monomers end to end is compatible with the ends of the elbow pipe (1), the straight pipe (2) and the regulating pipe (3). The flange monomer comprises a first connecting area (41) and a second connecting area (42). The first connecting area (41) is a plate-like structure with a U-shaped longitudinal cross section. The second connecting area (42) is a plate-like structure vertically connected to one side of the opening end of the first connecting area (41).

9. The hot air duct device of a grain dryer according to claim 8, characterized in that: In the two connecting flanges (4) used for connecting the elbow pipe (1) and the straight pipe (2), the regulating pipe (3) and the elbow pipe (1), or the regulating pipe (3) and the straight pipe (2), and two adjacent straight pipes (2), the ends of the first connecting areas (41) on the two flange monomers that are away from the second connecting area (42) are connected via the fixing mechanism (5), and the second connecting area (42) is connected to the elbow outer plate (11), the straight outer plate (21), and the side wall of the regulating pipe (3) via the fixing mechanism (5).

10. The hot air duct device of a grain dryer according to claim 1, characterized in that: The fixing mechanism (5) is a self-tapping screw.

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