Pneumatic conveying device and grain drying equipment

Abstract

The utility model relates to the field of grain production, and discloses a pneumatic conveying device and grain drying equipment. The pneumatic conveying device comprises a box body, and a feeding chamber located on the upper layer and an air feeding chamber located on the lower layer are arranged in the box body; the air hole plate is used for separating the feeding chamber from the air feeding chamber; a plurality of inclined holes which are distributed at intervals are formed in the air hole plate; and gas in the gas supply chamber is guided by inclined holes in the air hole plate, then is obliquely blown out and drives materials in the feeding chamber to flow towards one end of the feeding chamber. The grain drying equipment adopts the pneumatic conveying device. The inclined holes are formed in the air hole plate, so that air in the air supply chamber forms inclined blowing airflow, materials in the feeding chamber are driven to flow towards one end of the feeding chamber under common pushing of pneumatic force and gravity or independent pushing of the pneumatic force, and conveying of the materials at a small inclination angle or in a horizontal state is achieved; therefore, the problem that the height difference between the two ends of the air conveying chute is large is solved.

Description

Technical Field

[0001] The present application belongs to the field of grain production technology, and specifically relates to a pneumatic conveying device and grain drying equipment. Background Art

[0002] Drying, processing, and storage are all crucial steps in grain production, profoundly impacting grain quality. Grain transportation is essential for drying, processing, and storage. The automated, intact delivery of grain to its destination through specialized conveying equipment significantly impacts the speed and quality of drying, processing, and storage.

[0003] An air conveying chute uses high-pressure air as a power source to fluidize materials within a closed chute and slowly flow them toward the lower end, conveying easily fluidized powdered or granular materials such as cement and fly ash. This device, lacking a mechanical transmission mechanism, offers advantages such as light weight, low power consumption, high conveying force, and easy reversal of conveying direction. For example, Chinese patent CN212150792U - A Pneumatic Conveying Chute.

[0004] In existing technology, air conveying chutes need to be installed at an angle to ensure that materials flow toward the lower end under the action of gravity. The feeding angle between the flow direction of powdered materials and the horizontal direction is generally set at 5° to 10°, the feeding angle for granular materials is generally above 10°, and the feeding angle for heavier granular materials is generally above 30°. This results in a large height difference between the two ends of the air conveying chute in the longitudinal direction, which requires a high degree of external space layout and limits its application scenarios. Utility Model Content

[0005] The purpose of this application is to provide a pneumatic conveying device and grain drying equipment to solve the problem of a large height difference between the two ends of the air conveying chute, thereby achieving the effect of improving the flexibility of spatial layout.

[0006] In order to achieve the above-mentioned object, the present application provides a pneumatic conveying device in a first aspect, comprising:

[0007] The box body is provided with a feeding chamber located at the upper layer and an air feeding chamber located at the lower layer;

[0008] A vent plate is used to separate the feeding chamber from the air delivery chamber; the vent plate is formed with a plurality of oblique holes distributed at intervals;

[0009] The gas in the air delivery chamber is guided by the oblique holes on the air perforated plate, blown out obliquely and drives the material in the feeding chamber to flow toward one end of the feeding chamber.

[0010] In some embodiments, the flow direction of the material in the feeding chamber forms a feeding angle A of -4° to 10° with the horizontal direction, wherein when the feeding angle A is a positive number, the flow direction is inclined downward; when the feeding angle A is a negative number, the flow direction is inclined upward.

[0011] In some embodiments, the oblique holes are louver holes integrally formed on the plate surface of the air perforated plate.

[0012] In some embodiments, the oblique hole comprises:

[0013] a first opening communicating with the feeding chamber;

[0014] a second opening communicating with the air delivery chamber;

[0015] The oblique wall connects the first opening and the second opening; the oblique wall and the plate surface of the air perforated plate form an air supply angle B of 10° to 45°.

[0016] In some embodiments, the oblique wall is located on one side of the air delivery chamber of the box.

[0017] In some embodiments, the oblique holes are spaced apart along the length direction and the width direction of the air permeable plate, and the oblique holes in two rows spaced apart along the length direction are staggered with each other.

[0018] In some embodiments, the feeding chamber of the box body is provided with:

[0019] A feed interface, located on the top wall of the head end of the feeding chamber;

[0020] The discharge interface is located on the bottom wall of the tail end of the feeding chamber.

[0021] In some embodiments, a middle discharge interface is provided on the side wall of the middle part of the feeding chamber, and the pneumatic conveying device also includes a first plug plate and a second plug plate arranged at the middle discharge interface, the first plug plate is used to change the flow direction of the material in the feeding chamber, and the second plug plate is used to open or close the middle discharge interface.

[0022] In some embodiments, a dust removal interface for providing negative pressure to the feeding chamber is further provided on the top wall of the feeding chamber.

[0023] In some embodiments, the pneumatic conveying device further includes an air delivery pipe for supplying air to the air delivery chamber of the box, and a plurality of the air delivery pipes are spaced apart along the length direction of the air delivery chamber.

[0024] The second aspect of the present application provides a grain drying equipment, which includes: a collecting hopper, an elevator and the above-mentioned pneumatic conveying device, wherein the elevator is arranged on one side of the collecting hopper, and the pneumatic conveying device is arranged at the bottom of the collecting hopper, and the grain flowing out of the collecting hopper is transported to the feed port at the bottom of the elevator through the pneumatic conveying device.

[0025] The third aspect of the present application provides a grain drying equipment, which includes: a dryer, an elevator and the above-mentioned pneumatic conveying device, wherein the elevator is arranged on one side of the dryer, and the pneumatic conveying device is arranged on the top of the dryer, and the grain flowing out of the elevator is transported to the feed port at the top of the dryer through the pneumatic conveying device.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] The pneumatic conveying device of the present application forms a number of spaced oblique holes on the air perforated plate, so that the gas in the air delivery chamber forms an oblique airflow, driving the material in the feeding chamber to flow toward one end of the feeding chamber under the joint push of air force and gravity or under the push of air force alone, thereby realizing the transportation of materials at a small inclination angle or in a horizontal state, reducing the height difference between the two ends of the pneumatic conveying device, and thus solving the problem of a large height difference between the two ends of the air conveying chute, thereby achieving the effect of improving the flexibility of spatial layout.

[0028] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without inventive work. In the drawings:

[0030] Figure 1 This is a front view of a pneumatic conveying device according to a specific embodiment of the present application.

[0031] Figure 2 This is a schematic diagram of material flow in a pneumatic conveying device according to a specific embodiment of the present application, where the direction of the arrow is the direction of material flow.

[0032] Figure 3 This is a top view of a partial position of a pneumatic conveying device according to a specific embodiment of the present application.

[0033] Figure 4This is a side view of a partial position of a pneumatic conveying device according to a specific embodiment of the present application.

[0034] Figure 5 This is a front view of the air perforated plate of the pneumatic conveying device according to a specific embodiment of the present application.

[0035] Figure 6 This is a cross-sectional view of the oblique holes of the air permeable plate of the pneumatic conveying device according to a specific embodiment of the present application, where the arrows indicate the direction of gas flow.

[0036] Figure 7 This is a schematic diagram of the installation of the first pneumatic conveying device of the grain drying equipment according to the specific implementation method of this application.

[0037] Figure 8 This is a schematic diagram of the installation of the second pneumatic conveying device of the grain drying equipment according to the specific implementation method of this application.

[0038] Description of reference numerals:

[0039] 1 Box 11 Feeding Chamber

[0040] 12 Air delivery chamber 13 Feed interface

[0041] 14 discharge interface 15 middle discharge interface

[0042] 16 Dust removal interface 2 ventilation plate

[0043] 21 oblique hole 211 first opening

[0044] 212 Second opening 213 Oblique wall

[0045] 31 First plugboard 32 Second plugboard

[0046] 4 Air supply pipe 5 Collection hopper

[0047] 6 Elevator 7 Dryer

[0048] 81 First pneumatic conveying device 82 Second pneumatic conveying device DETAILED DESCRIPTION

[0049] The following describes the specific embodiments of the present application in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application and are not intended to limit the present application.

[0050] like Figures 1 to 6 As shown, a pneumatic conveying device comprises:

[0051] The box body 1 is provided with a feeding chamber 11 located at the upper layer and an air feeding chamber 12 located at the lower layer;

[0052] The air perforated plate 2 is used to separate the feeding chamber 11 from the air delivery chamber 12; a plurality of oblique holes 21 distributed at intervals are formed on the air perforated plate 2;

[0053] The gas in the air delivery chamber 12 is guided by the oblique holes 21 on the air perforated plate 2 , blown out obliquely, and drives the material in the feeding chamber 11 to flow toward one end of the feeding chamber 11 .

[0054] In the present application, the box body 1 is generally provided with a feed interface 13 and a discharge interface 14 at both ends in the longitudinal direction. The interior of the box body 1 is divided into an upper feeding chamber 11 and a lower air delivery chamber 12 by a breathable plate 2. During operation, the material enters the feeding chamber 11 from the feed interface 13; the gas in the air delivery chamber 12 diffuses upward into the feeding chamber 11 through the breathable plate 2, and the gas is blown out at a certain angle relative to the plate surface of the breathable plate 2 under the guidance of the oblique holes 21; under the action of the oblique airflow, the material is fluidized and flows toward the discharge interface 14. The direction of the oblique airflow is roughly the same as the flow direction of the material, both pointing to the side of the discharge interface 14. Compared with the conventional method of blowing gas vertically along the surface of the air perforated plate 2, the gas is blown obliquely onto the material. On the one hand, it enables the material to overcome its own weight and be in a micro-suspension state, that is, fluidization. On the other hand, it enables the material to obtain power along the flow direction; that is, the fluidized material can flow toward the discharge interface 14 under the joint push of air force and gravity or under the push of air force alone, realizing the transportation of materials at a small inclination angle or in a horizontal state, reducing the feeding angle A between the flow direction of the material and the horizontal direction, reducing the height difference between the two ends of the pneumatic conveying device, and thus solving the problem of a large height difference at both ends of the air conveying chute, thereby achieving the effect of improving the flexibility of spatial layout.

[0055] In addition, compared with the prior art, when the feeding angle A is the same, since the material of the pneumatic conveying device of the present application can flow under the joint push of air force and gravity, the material flow speed is faster and the gas consumption is less.

[0056] In the present application, a pneumatic conveying device is used to transport grains. Compared to existing methods of transporting grains using equipment such as screw conveyors, scrapers, and belts, the pneumatic conveying device uses a mechanical transmission system and does not involve mechanical extrusion. This avoids crushing of the grains during the conveying process, significantly reducing the breakage rate of the grains and improving the quality of grain transportation. Of course, the pneumatic conveying device of the present application is not limited to the transportation of the aforementioned grains, but can also be used to transport other types of powdered or granular materials.

[0057] Specifically, the flow direction of the material in the feeding chamber 11 is at a feeding angle A of -4° to 10° with the horizontal direction, wherein when the feeding angle A is a positive number, the flow direction is inclined downward; when the feeding angle A is a negative number, the flow direction is inclined upward. The flow direction of the material is usually in the longitudinal direction of the box body 1, from the feed interface 13 to the discharge interface 14. The feeding angle A is equivalent to the inclination angle when the pneumatic conveying device is installed. For moist cereal grains, considering the angle and aperture of the oblique holes 21 on the air perforated plate 2, and the pressure and flow rate of the gas in the air feeding chamber 12, the feeding angle A of the pneumatic conveying device is in the range of -4° to 10°, which can enable the material to obtain a suitable conveying speed, prevent the material from being blocked on the side of the discharge interface 14, and keep the height difference between the two ends of the pneumatic conveying device in a small range.

[0058] In this application, when the feeding angle A is a positive number, the pneumatic conveying device is placed tilted downward, and the material flows tilted downward from the feed interface 13 to the discharge interface 14; when the feeding angle A is 0, the pneumatic conveying device is placed horizontally, and the material flows horizontally from the feed interface 13 to the discharge interface 14; when the feeding angle A is a negative number, the pneumatic conveying device is placed tilted upward, and the material flows tilted upward from the feed interface 13 to the discharge interface 14.

[0059] like Figure 5 、 Figure 6 As shown, specifically, the oblique holes 21 are louver holes integrally formed on the surface of the air perforated plate 2. Given the limited thickness of the air perforated plate 2, the louver hole structure can provide a longer guide path, fully changing the direction of the gas passing through to form an ideal oblique airflow.

[0060] Furthermore, the oblique hole 21 includes: a first opening 211, connected to the feed chamber 11; a second opening 212, connected to the air supply chamber 12; an oblique wall 213, connecting the first opening 211 and the second opening 212; and an air supply angle B of 10° to 45° formed between the oblique wall 213 and the surface of the air perforated plate 2. Gas enters from the second opening 212 and, guided by the oblique wall 213, is blown out obliquely from the first opening 211 at the air supply angle B. If the air supply angle B is too small, the force exerted by the oblique airflow on the material in the direction of gravity is reduced, resulting in poor fluidization of the material. If the air supply angle B is too large, the force exerted by the oblique airflow on the material in the flow direction is reduced, resulting in a reduced flow rate of the material. An air supply angle B within the range of 10° to 45° enables the oblique airflow to achieve a better combined balance between the fluidization process and the pushing process of the material.

[0061] Furthermore, the oblique wall 213 is located on one side of the air delivery chamber 12 of the box body 1. For the louver structure, the oblique wall 213 is located on one side of the air delivery chamber 12, and the first opening 211 is larger than the second opening 212, so that the oblique airflow entering the feeding chamber 11 can fully contact the material, driving the material to flow toward the discharge interface 14.

[0062] Specifically, the oblique holes 21 are spaced apart along the length and width of the air perforated plate 2, with two rows of oblique holes 21 spaced apart along the length being staggered. The staggered arrangement of the oblique holes 21 allows air to be evenly blown out of the air perforated plate 2 at an angle, enhancing the oblique airflow's effect on suspending and driving the material, thereby increasing the conveying speed and anti-clogging effectiveness of the pneumatic conveying device.

[0063] like Figures 1 to 4 Specifically, the feeding chamber 11 of the housing 1 is provided with a feed port 13 at each end along its length, located on the top wall at the leading end of the feeding chamber 11; and a discharge port 14 at the bottom wall at the trailing end of the feeding chamber 11. During operation, material falls into the feeding chamber 11 through the feed port 13 under its own gravity, is driven by the oblique airflow toward the discharge port 14, and finally falls out of the discharge port 14 under its own gravity. The placement of the feed port 13 on the top wall and the discharge port 14 on the bottom wall prevents material from clogging the feed port 13 and the discharge port 14.

[0064] Specifically, a central discharge port 15 is located on the sidewall of the central portion of the feeding chamber 11. The pneumatic conveying device also includes a first plate 31 and a second plate 32 positioned at the central discharge port 15. The first plate 31 is used to change the flow direction of material within the feeding chamber 11, while the second plate 32 is used to open or close the central discharge port 15. During operation, closing the first plate 31 and opening the second plate 32 causes material within the feeding chamber 11 to flow out of the central discharge port 15. Opening the first plate 31 and closing the second plate 32 causes material to resume flowing out of the discharge port 14 at the end of the feeding chamber 11. The addition of the central discharge port 15 enhances the pneumatic conveying device's discharge flexibility.

[0065] Specifically, a dust removal interface 16 for providing negative pressure to the feeding chamber 11 is further provided on the top wall of the feeding chamber 11. The dust removal interface 16 provides negative pressure to the feeding chamber 11 through an external negative pressure device, which can remove dust and impurities contained in the fluidized material, allowing the grains to be simultaneously air-selected and separated during the conveying process, thereby improving the cleanliness of the grains.

[0066] Specifically, the pneumatic conveying device further includes an air delivery pipe 4 for supplying air to the air delivery chamber 12 of the box body 1. Several air delivery pipes 4 are spaced apart along the length of the air delivery chamber 12. The spaced apart air delivery pipes 4 can evenly supply air to the air delivery chamber 12 along its length, thereby ensuring that the air is evenly diffused upward through the air perforated plate 2 into the feeding chamber 11, blown out obliquely, and drives the material in the feeding chamber 11 to flow toward the discharge port 14.

[0067] In some embodiments, the box body 1 is a tubular body with a rectangular cross-section, which can be spliced in multiple sections along its length. The feeding chamber 11 of the box body 1 is provided with a feed interface 13, a dust removal interface 16, a middle discharge interface 15 and a discharge interface 14 in sequence from the head end to the tail end. The middle discharge interface 15 is located on the two side walls of the middle of the feeding chamber 11. The first plug plate 31 is provided on the front side of the middle discharge interface 15 along the flow direction. When the first plug plate 31 is closed, the material cannot continue to flow to the discharge interface 14 at the end of the feeding chamber 11. The second plug plate 32 is provided on the middle discharge interface 15. When the second plug plate 32 is opened, the material can flow into the middle discharge interface 15. Several air supply pipes 4 are spaced apart on the bottom wall of the air supply chamber 12 of the box body 1. After the air supply pipes 4 merge, they are connected to an external air supply device or air source.

[0068] The vent plate 2 is mounted horizontally within the housing 1, dividing the interior of the housing 1 into an upper feeding chamber 11 and a lower air delivery chamber 12. The vent plate 2 is stamped with oblique holes 21 arranged in alternating rows and columns. The first opening 211 of these oblique holes 21 is arched and perpendicular to the surface of the vent plate 2; the second opening 212 is rectangular and parallel to the surface of the vent plate 2.

[0069] like Figure 7 、 Figure 8 As shown, a grain drying device includes: a collecting hopper 5, an elevator 6, a dryer 7, and the above-mentioned pneumatic conveying device, the pneumatic conveying device including a first pneumatic conveying device 81 and a second pneumatic conveying device 82. The collecting hopper 5, the elevator 6, and the dryer 7 are arranged in sequence and spaced apart; the first pneumatic conveying device 81 is provided at the bottom of the collecting hopper 5, and the grain flowing out of the collecting hopper 5 is transported to the feed inlet at the bottom of the elevator 6 via the first pneumatic conveying device 81; the second pneumatic conveying device 82 is provided at the top of the dryer 7, and the grain flowing out of the elevator 6 is transported to the feed inlet at the top of the dryer 7 via the second pneumatic conveying device 82.

[0070] In some embodiments, the top of the feeding chamber of the first pneumatic conveying device 81 serves as a feeding interface as a whole, and the feeding chamber does not have a dust removal interface. The feeding interface of the first pneumatic conveying device 81 is connected to the discharge port of the collecting hopper 5, and the discharge interface of the first pneumatic conveying device 81 is connected to the feeding port at the bottom of the elevator 6. The air supply pipe of the first pneumatic conveying device 81 is connected to the air source. During operation, the grains in the collecting hopper 5 slide into the feeding chamber of the first pneumatic conveying device 81. The high-pressure gas connected to the air supply pipe passes through the air supply chamber and is blown out obliquely along the oblique holes on the air vent plate. Under the action of the oblique airflow, the grains flow toward the discharge interface of the feeding chamber and finally fall into the feeding port at the bottom of the elevator 6.

[0071] In some embodiments, a feed interface is provided at the top of the head end of the feeding chamber of the second pneumatic conveying device 82, and a dust removal interface is provided at the middle top of the feeding chamber. The feed interface of the second pneumatic conveying device 82 is connected to the discharge port at the top of the elevator 6, the discharge interface of the second pneumatic conveying device 82 is connected to the feed port at the top of the dryer 7, the dust removal interface of the second pneumatic conveying device 82 is connected to the negative pressure dust removal chamber through a steel wire hose, and the air supply pipe of the second pneumatic conveying device 82 is connected to the air source. During operation, after the elevator 6 lifts the grain to a high place, the grain slides from the discharge port at the top of the elevator 6 to the feeding chamber of the second pneumatic conveying device 82. The high-pressure gas connected to the air supply pipe passes through the air supply chamber and is blown out obliquely along the oblique holes on the air vent plate. Under the action of the oblique airflow, the grain flows toward the discharge interface of the feeding chamber and finally falls into the feed port at the top of the dryer.

[0072] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0073] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0074] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. 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 can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0075] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A pneumatic conveying device, characterized in that: The pneumatic conveying device comprises: The box body (1) is provided with a feeding chamber (11) located at an upper layer and an air feeding chamber (12) located at a lower layer; A vent plate (2) is used to separate the feeding chamber (11) from the air feeding chamber (12); a plurality of oblique holes (21) distributed at intervals are formed on the vent plate (2); The gas in the air delivery chamber (12) is guided by the oblique holes (21) on the air permeable plate (2), blown out obliquely and drives the material in the feeding chamber (11) to flow toward one end of the feeding chamber (11).

2. The pneumatic conveying device according to claim 1, characterized in that The flow direction of the material in the feeding chamber (11) forms a feeding angle A of -4° to 10° with the horizontal direction, wherein when the feeding angle A is a positive number, the flow direction is inclined downward; when the feeding angle A is a negative number, the flow direction is inclined upward.

3. The pneumatic conveying device according to claim 1, characterized in that The oblique holes (21) are louver holes integrally formed on the plate surface of the air perforated plate (2).

4. The pneumatic conveying device according to claim 3, characterized in that The oblique hole (21) comprises: A first opening (211) communicating with the feeding chamber (11); a second opening (212) communicating with the air delivery chamber (12); The oblique wall (213) connects the first opening (211) and the second opening (212); the oblique wall (213) and the plate surface of the air perforated plate (2) form an air supply angle B of 10° to 45°.

5. The pneumatic conveying device according to claim 4, characterized in that: The oblique wall (213) is located on one side of the air delivery chamber (12) of the box body (1).

6. The pneumatic conveying device according to claim 3, characterized in that: The oblique holes (21) are spaced apart along the length direction and the width direction of the air perforated plate (2), and the two rows of oblique holes (21) spaced apart along the length direction are staggered with each other.

7. The pneumatic conveying device according to any one of claims 1 to 6, characterized in that: The feeding chamber (11) of the box body (1) is provided with the following at both ends along its length direction: A feed interface (13) is located on the top wall of the head end of the feeding chamber (11); The discharge interface (14) is located on the bottom wall of the tail end of the feeding chamber (11).

8. The pneumatic conveying device according to any one of claims 1 to 6, characterized in that: A middle discharge interface (15) is provided on a side wall of the middle portion of the feeding chamber (11), and the pneumatic conveying device further comprises a first plug plate (31) and a second plug plate (32) arranged at the middle discharge interface (15), wherein the first plug plate (31) is used to change the flow direction of the material in the feeding chamber (11), and the second plug plate (32) is used to open or close the middle discharge interface (15).

9. The pneumatic conveying device according to any one of claims 1 to 6, characterized in that: A dust removal interface (16) for providing negative pressure to the feeding chamber (11) is also provided on the top wall of the feeding chamber (11).

10. The pneumatic conveying device according to any one of claims 1 to 6, characterized in that: The pneumatic conveying device further comprises an air supply pipe (4) for supplying air to the air supply chamber (12) of the box (1), and a plurality of the air supply pipes (4) are distributed at intervals along the length direction of the air supply chamber (12).

11. A grain drying device, characterized in that: The grain drying equipment includes: a collecting hopper (5), an elevator (6) and a pneumatic conveying device according to any one of claims 1 to 10, wherein the elevator (6) is arranged on one side of the collecting hopper (5), the pneumatic conveying device is arranged at the bottom of the collecting hopper (5), and the grain flowing out of the collecting hopper (5) is transported to the feed port at the bottom of the elevator (6) through the pneumatic conveying device.

12. A grain drying device, characterized in that: The grain drying equipment comprises: a dryer (7), an elevator (6) and a pneumatic conveying device according to any one of claims 1 to 10, wherein the elevator (6) is arranged on one side of the dryer (7), the pneumatic conveying device is arranged on the top of the dryer (7), and the grain flowing out of the elevator (6) is transported to the feed port at the top of the dryer (7) through the pneumatic conveying device.

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