Circular high pressure air knife

Abstract

The utility model provides a kind of circular high-pressure air knife, comprising: pedestal axial perpendicular is installed on the wall of coal bunker;The first end of pedestal is flush with the inner wall of coal bunker;Gas containment cylinder first end connects high-pressure gas source, and the end face of gas containment cylinder second end is flush with the end face of pedestal close to coal bunker;Supporting structure is installed in the inside of gas containment cylinder;Piston structure, under the impetus of high-pressure gas, moves from initial position to working position;Limiting structure limits the distance that piston structure moves to coal bunker inside direction, and after high-pressure gas cancels, drive piston structure to return to initial position.In the present application, after high-pressure pulse gas enters gas containment cylinder, piston structure is moved to form annular gap, when high-pressure gas is ejected at high speed from the annular gap, high-pressure airflow forms uniform annular air curtain along the inner wall of coal bunker, stripping the attached coal on the inner wall of coal bunker, reduce the friction between coal body and bin wall, prevent coal seam from sticking accumulation.

Description

Technical Field

[0001] This utility model relates to the field of coal bunker anti-blockage technology, specifically to a circular high-pressure air knife. Background Technology

[0002] In the process of coal storage and transportation, coal bunkers, as a critical link, often experience coal blockage problems, with coal arching and coal sticking to the walls being the main causes. Currently, high-pressure air cannons are a commonly used technology for preventing coal blockage in coal bunkers.

[0003] The high-pressure air cannon consists of an air storage tank installed on the coal bunker wall. When arching occurs in the coal bunker, the air storage tank quickly releases the stored high-pressure air, forcefully injecting it into the coal bunker. The high-speed gas creates a powerful impact force inside the bunker, exerting multi-directional forces on the arched coal mass, causing the arched coal mass to lose stability and collapse, thus restoring normal coal feeding to the bunker.

[0004] However, the high-pressure air cannon's gas output direction is only towards the coal bunker, and its effective range is concentrated in the center of the bunker and the surrounding free space. When the coal has high moisture content, is soft, or the bunker wall surface is not smooth, coal easily adheres to the bunker wall and gradually thickens. Because the air cannon cannot directly act on the coal on the bunker wall, it is ineffective in solving the coal blockage problem caused by coal sticking to the wall. Severe coal sticking to the wall can lead to a reduction in the effective volume of the coal bunker or even complete blockage, affecting normal coal transportation and production operations.

[0005] Therefore, it is necessary to provide an apparatus to solve the problems existing in the prior art. Utility Model Content

[0006] The main objective of this invention is to provide a circular high-pressure air knife, which at least solves the problem that air cannons in the prior art cannot directly act on the coal burning on the bin wall and are ineffective in dealing with the coal blockage caused by coal sticking to the wall.

[0007] To achieve the above objectives, this utility model provides a circular high-pressure air knife, comprising: a base, the base being hollow and axially vertically mounted on the wall of a coal bunker; a first end of the base being flush with the inner wall of the coal bunker; a gas receiving cylinder, the first end of which is connected to a high-pressure gas source and coaxially connected to the base; a second end face of which is flush with the end face of the base near the coal bunker; a support structure installed inside the gas receiving cylinder; a piston structure installed on the support structure; the piston structure being used to move from an initial position to a working position under the push of high-pressure gas; and a limiting structure fitted onto the piston structure, the limiting structure being used to limit the distance the piston structure moves towards the interior of the coal bunker, and to drive the piston structure back to the initial position after the high-pressure gas is removed.

[0008] The initial position is the position of the piston structure when the second end of the piston structure is in close contact with the second end face of the gas container; in the working position, there is an annular gap between the second end of the piston structure and the second end face of the gas container, and the high-pressure gas is ejected from the annular gap to impact the coal adhering to the wall of the coal bunker.

[0009] Optionally, the gas container includes:

[0010] A first connecting cylinder, the first end of which is screwed to the inner surface of the base, and the end face of the first end of the first connecting cylinder is flush with the inner wall of the coal bunker.

[0011] The second connecting cylinder has its first end screwed to the inner surface of the second end of the first connecting cylinder; the outer surface of the second end of the second connecting cylinder is screwed to a high-pressure gas source.

[0012] Optionally, the support structure includes:

[0013] A cross support frame, wherein the cross support frame is a cross-shaped frame, and multiple end faces of the cross support frame are fixed to the inner wall of the second connecting cylinder; the center of the cross support frame is located on the axis of the second connecting cylinder;

[0014] High-pressure gas can flow through the gaps in the frame of the cross support.

[0015] Optionally, the piston structure includes:

[0016] A piston rod, which is axially movable and mounted on the cross support frame, passes through the center of the cross support frame;

[0017] A piston head is coaxially connected to the second end of the piston rod; the piston head includes a coaxial conical structure and a disc structure; the small end of the conical structure is connected to the first end of the piston rod, and the sidewall of the large end of the conical structure is in contact with the inner wall of the first connecting cylinder; the disc structure is connected to the end face of the large end of the conical structure.

[0018] High-pressure air acts on the conical surface of the piston head, pushing the piston head to move towards the interior of the coal bunker; when the piston structure is in the initial position, the end face of the disc structure is in close contact with the first end face of the first connecting cylinder; when the piston structure is in the working position, there is an annular gap between the end face of the disc structure and the first end face of the first connecting cylinder.

[0019] Optionally, the side surface of the cone-like structure of the piston head is curved.

[0020] Optionally, the limiting structure includes:

[0021] A limiting plate, which is fitted onto the first end of the piston rod;

[0022] A limiting sleeve is fitted onto the piston rod, and the outer surface of the limiting sleeve is fixed to the cross support frame.

[0023] A compression spring is located between the cross support frame and the limiting plate, and the compression spring is fitted onto the outer surface of the limiting sleeve and the piston rod;

[0024] When high-pressure gas is introduced, the piston head moves towards the interior of the coal bunker, and drives the piston rod to move until the end face of the limiting sleeve abuts against the first end of the limiting plate, so that the piston structure reaches the working position; when the high-pressure gas is removed, the reaction force of the spring pushes the limiting sleeve away from the limiting plate, and at the same time the limiting plate drives the piston structure back to the initial position.

[0025] Optionally, a first locking nut is screwed onto the outer surface of the first connecting cylinder, and one end of the first locking nut abuts against the second end of the base.

[0026] Optionally, a polygonal boss is provided axially on the outer surface of the second connecting cylinder, and the polygonal boss is used to drive the second connecting cylinder to rotate when subjected to external rotational force.

[0027] Optionally, the limiting structure further includes:

[0028] The second locking nut is screwed onto the piston rod and abuts against the second end of the limiting plate.

[0029] This utility model discloses a circular high-pressure air knife, comprising: a hollow base, which is axially and vertically mounted on the wall of a coal bunker; a first end of the base being flush with the inner wall of the coal bunker; a gas receiving cylinder, the first end of which is connected to a high-pressure gas source and coaxially connected to the base; a second end face of which is flush with the end face of the base near the coal bunker; a support structure installed inside the gas receiving cylinder; and a piston structure mounted on the support structure; the piston structure is used to move from an initial position to a working position under the push of high-pressure gas. Position; limiting structure, which is fitted onto the piston structure, is used to limit the distance the piston structure moves towards the inside of the coal bunker, and to return the piston structure to its initial position after the high-pressure gas is removed; wherein, the initial position is the position of the piston structure when the second end of the piston structure is in close contact with the second end face of the gas receiving cylinder; in the working position, there is an annular gap between the second end of the piston structure and the second end face of the gas receiving cylinder, and the high-pressure gas is ejected from the annular gap, impacting the coal adhering to the wall of the coal bunker. Thus, after the high-pressure pulse gas enters the gas receiving cylinder, it pushes the piston structure to move and form an annular gap. When the high-pressure gas is ejected at high speed from this annular gap, the airflow will form a uniform annular air curtain along the inner wall of the coal bunker, peeling off the coal adhering to the inner wall of the coal bunker, reducing the friction between the coal and the bunker wall, and preventing the coal seam from sticking and accumulating. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0031] Figure 1 This is a schematic diagram of a circular high-pressure air knife structure that can be selected according to an embodiment of the present utility model.

[0032] Figure label:

[0033] 10. Base; 20. Gas container; 21. First connecting cylinder; 22. Second connecting cylinder; 23. Polygonal boss; 30. Support structure; 31. Cross support frame; 40. Piston structure; 41. Piston rod; 42. Piston head; 50. Limiting structure; 51. Limiting plate; 52. Limiting sleeve; 53. Compression spring; 54. Second locking nut; 60. Coal bunker; 70. First locking nut. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] like Figure 1 As shown, a circular high-pressure air knife includes:

[0036] The base 10 is hollow and is axially and vertically installed on the wall of the coal bunker 60; the first end of the base 10 is flush with the inner wall of the coal bunker 60.

[0037] A gas container 20 is provided, with its first end connected to a high-pressure gas source and coaxially connected to the base 10; the second end face of the gas container 20 is flush with the end face of the base 10 near the coal bunker 60.

[0038] The support structure 30 is installed inside the gas container 20;

[0039] A piston structure 40 is mounted on the support structure 30 and is coaxial with the gas container 20; the piston structure 40 is used to move from an initial position to a working position under the push of high-pressure gas.

[0040] A limiting structure 50 is fitted onto the piston structure 40. The limiting structure 50 is used to limit the distance that the piston structure 40 moves toward the inside of the coal bunker 60, and to drive the piston structure 40 back to the initial position after the high-pressure gas is removed.

[0041] The initial position is the position of the piston structure 40 when the second end of the piston structure 40 is in close contact with the second end face of the gas container 20; in the working position, there is an annular gap between the second end of the piston structure 40 and the second end face of the gas container 20, and the high-pressure gas is ejected from the annular gap to impact the coal adhering to the wall of the coal bunker 60.

[0042] Specifically, the base 10 is a hollow cylindrical structure, axially and vertically fixed to the wall of the coal bunker 60. One end of the base 10 is flush with the inner wall surface of the coal bunker 60, providing a stable support platform for the installed gas container. The entire device is anchored to the wall of the coal bunker 60 via the base 10.

[0043] The second end of the base 10, that is, the end of the base 10 furthest from the coal bunker 60, is coaxially connected to the gas receiving cylinder 20 via a threaded connection. The first end of the gas receiving cylinder 20 is connected to a high-flow pulse valve via a threaded interface. The high-flow pulse valve is connected to an external high-pressure gas source, and the interior of the gas receiving cylinder 20 serves as a temporary storage chamber for high-pressure pulsed gas. When the high-flow pulse valve opens instantaneously, the high-pressure gas from the high-pressure gas source is rapidly injected into the gas receiving cylinder 20 in a pulsed manner, pushing the piston structure 40 to move. The end face of the second end of the gas receiving cylinder 20 is flush with the inner wall of the coal bunker 60, so that when the high-pressure gas is ejected from the gas receiving cylinder 20, it can flow closely along the inner wall of the coal bunker 60, forming an airflow along the wall surface. When the high-pressure pulsed gas enters the gas container 20, it pushes the piston structure 40 to move and form an annular gap. When the high-pressure gas is ejected at high speed from this annular gap, the airflow forms a uniform annular air curtain along the inner wall of the coal bunker 60, which can effectively peel off the coal adhering to the inner wall. Especially for high-moisture and high-viscosity coal, the airflow impact and wall adhesion effect reduce the friction between the coal and the inner wall of the coal bunker 60, preventing coal seam adhesion and accumulation. At the same time, the dynamic air knife formed by the movement of the piston structure 40 can clean the coal adhering to the bunker wall, improving the anti-clogging and unclogging effect. The gas container 20 is made of high-strength alloy steel, and the pressure range of the high-pressure gas is 0.8-1.2 MPa.

[0044] The support structure 30 is nested inside the gas container 20, mainly to provide radial support for the piston structure 40, ensuring that the piston structure 40 slides only along its axial direction without wobbling under the push of high-pressure gas. The piston structure 40 is coaxial with the gas container 20, allowing the high-pressure gas to act evenly on the piston structure 40, avoiding wear or jamming caused by eccentric forces, and ensuring smooth movement of the piston structure 40. This allows the airflow from the annular gas knife to be sprayed stably and evenly onto the inner wall of the coal bunker 60.

[0045] During operation, high-pressure gas acts on piston structure 40, generating thrust and driving piston structure 40 to move towards the center of coal bunker 60. Limiting structure 50 controls the size of the annular gap by restricting the stroke of piston structure 40, thereby controlling and regulating the gas ejection flow rate and impact force. Limiting structure 50 can quickly push piston structure 40 back to its initial position after the high-pressure gas is depressurized. Specifically, the maximum stroke of piston structure 40 controlled by limiting structure 50 is 3mm, meaning the maximum gap width is 3mm, ensuring the strength of the high-pressure gas ejection.

[0046] The device opens instantaneously via a high-flow pulse valve, allowing high-pressure pulsed gas to enter the gas container 20 and push the piston structure 40. This creates a gap between the piston structure 40 and the second end face of the gas container 20, releasing a circular "air knife" in a 360° radius. Utilizing the Coanda effect, the gas adheres to the wall, separating the material from the inner wall of the coal bunker 60. This reduces the coefficient of friction on the inner wall, lowers frictional force to prevent material caking, and increases the fluidity of the material under reduced friction, ensuring smooth material descent out of the bunker. This effectively solves the problem of coal blockage caused by coal bunker arching and wall adhesion.

[0047] In one possible implementation, the gas container 20 includes:

[0048] The first connecting cylinder 21 has its first end screwed to the inner surface of the base 10, and the end face of the first end of the first connecting cylinder 21 is flush with the inner wall of the coal bunker 60.

[0049] The second connecting cylinder 22 has its first end screwed to the inner surface of the second end of the first connecting cylinder 21; the outer surface of the second end of the second connecting cylinder 22 is screwed to a high-pressure gas source.

[0050] Specifically, the gas receiving cylinder 20 adopts a split structure design, consisting of a first connecting cylinder 21 and a second connecting cylinder 22. The first end of the first connecting cylinder 21 is tightly connected to the inner surface of the base 10 via a thread, and the end face of the first connecting cylinder 21 is completely flush with the inner wall of the coal bunker 60, so that when the high-pressure gas is ejected from the gas receiving cylinder 20, it can flow closely along the wall of the coal bunker, forming an airflow along the wall. The split design of the gas receiving cylinder 20 into the first connecting cylinder 21 and the second connecting cylinder 22 makes the assembly and maintenance of the internal components more convenient.

[0051] In one possible implementation, the support structure 30 includes:

[0052] A cross support frame 31 is a cross-shaped frame, and multiple end faces of the cross support frame 31 are fixed to the inner wall of the second connecting cylinder 22; the center of the cross support frame 31 is located on the axis of the second connecting cylinder 22.

[0053] High-pressure gas can flow through the frame gaps of the cross support frame 31.

[0054] Specifically, the four end faces of the cross support frame 31 are firmly fixed to the inner wall of the second connecting cylinder 22, ensuring that the center of the cross coincides with the axis of the second connecting cylinder 22. The symmetrical structure can evenly disperse the impact force generated when the piston moves, and can also allow high-pressure gas to flow smoothly through the frame gap, avoiding gas blockage. On the one hand, it ensures the stability of the piston structure 40 in reciprocating motion and prevents wear or jamming caused by swaying. On the other hand, it ensures that the high-pressure gas can efficiently push the piston and form a stable annular air knife.

[0055] In one possible implementation, the piston structure 40 includes:

[0056] Piston rod 41, which is axially movable and mounted on the cross support frame 31, and passes through the center of the cross support frame 31;

[0057] A piston head 42 is coaxially connected to the second end of the piston rod 41. The piston head 42 includes a coaxial cone-shaped structure and a disk structure. The small end of the cone-shaped structure is connected to the first end of the piston rod 41, and the side wall of the large end of the cone-shaped structure is in contact with the inner wall of the first connecting cylinder 21. The disk structure is connected to the end face of the large end of the cone-shaped structure.

[0058] High-pressure air acts on the conical surface of the piston head 42, pushing the piston head 42 to move towards the interior of the coal bunker 60; when the piston structure 40 is in the initial position, the end face of the disc structure is in close contact with the first end face of the first connecting cylinder 21; when the piston structure 40 is in the working position, there is an annular gap between the end face of the disc structure and the first end face of the first connecting cylinder 21.

[0059] Specifically, the piston structure 40 consists of a piston rod 41 and a piston head 42. The piston rod 41 is axially movable and passes through the center of the cross support frame 31. The piston head 42 includes a coaxial conical structure and a disc structure. The small end of the conical structure is connected to the piston rod 41, and the conical surface near the large end is in contact with the inner wall of the first connecting cylinder 21. The disc structure is connected to the large end face of the conical structure. During operation, high-pressure gas is injected from the gas receiving cylinder 20 and acts on the conical surface of the conical structure. Then, it flows along the conical surface of the conical structure from the small end to the large end, and then enters the disc structure through the edge of the large end of the conical structure. The annular gap between the first end face of the first connecting cylinder 21 forms a high-speed airflow that propels the piston head 42 into the coal bunker 60. The conical surface of the cone-shaped structure guides the airflow to naturally converge into the annular gap, ensuring the stable formation of the air knife. The central through-structure of the piston rod 41 and the cross support frame 31, combined with the self-centering characteristic of the cone-shaped structure, ensures the coaxial accuracy of the piston head 42's movement and prevents wobbling and jamming. The planar seal between the disc structure and the end face of the first connecting cylinder 21 forms a reliable seal in the initial position and can quickly form a stable annular gap during operation, improving the unblocking efficiency and extending the service life of the device.

[0060] In one possible implementation, the side surface of the cone-like structure of the piston head 42 is curved.

[0061] Specifically, the curved surface creates a laminar flow effect when high-pressure gas flows along the conical surface. Gas molecules are evenly distributed and gradually accelerated along the curved surface, which enhances the stability of gas thrust and avoids airflow turbulence and local pressure concentration that may be caused by right-angled edges. In particular, the curved surface guides the flow, improving the efficiency of gas pushing the piston and making the piston movement more stable and reliable. Moreover, the smooth transition of the curved surface reduces gas flow resistance and energy loss. In addition, it can effectively disperse the stress generated during the movement of the piston head 42, reduce local wear, and extend the service life of the piston head 42.

[0062] In one possible implementation, the limiting structure 50 includes:

[0063] Limiting plate 51, which is fitted onto the first end of piston rod 41;

[0064] A limiting sleeve 52 is fitted onto the piston rod 41, and the outer surface of the limiting sleeve 52 is fixed onto the cross support frame 31.

[0065] Compression spring 53 is located between the cross support frame 31 and the limiting plate 51, and the compression spring 53 is fitted on the outer surface of the limiting sleeve 52 and the piston rod 41;

[0066] When high-pressure gas is introduced, the piston head 42 moves towards the interior of the coal bunker 60, and drives the piston rod 41 to move until the end face of the limiting sleeve 52 abuts against the first end of the limiting plate 51, so that the piston structure 40 reaches the working position; when the high-pressure gas is deactivated, the reaction force of the spring pushes the limiting sleeve 52 away from the limiting plate 51, and at the same time the limiting plate 51 drives the piston structure 40 back to the initial position.

[0067] Specifically, the limiting structure 50 consists of a limiting plate 51 fitted onto the first end of the piston rod 41, a limiting sleeve 52 fixed to the cross support frame 31, and a compression spring 53 located between the two. The limiting sleeve 52 is fitted onto the piston rod 41 and coaxially fixed to the cross support frame 31, and is positioned between the cross support frame 31 and the piston rod 41. The compression spring 53 is fitted onto the outer surfaces of the limiting sleeve 52 and the piston rod 41. When high-pressure gas is introduced, the piston head 42 pushes the piston rod 41 until the end face of the limiting sleeve 52 abuts against the first end of the limiting plate 51. Through mechanical limiting, the piston structure 40 is precisely controlled to reach the working position, ensuring the formation of a stable annular air knife gap. After the high-pressure gas is removed, the reaction force of the compression spring 53 pushes the limiting plate 51 through the end face of the outer boss of the limiting sleeve 52, causing the piston structure 40 to return to its initial position. The preload of the compression spring 53 is adjustable to adapt to different working conditions, enhancing the adaptability of the device. In addition, the combination of mechanical limiting and elastic reset not only ensures the accuracy of the working position, but also ensures that the piston structure 40 can be reset quickly and reliably.

[0068] In one possible implementation, a first locking nut 70 is screwed onto the outer surface of the first connecting cylinder 21, and one end of the first locking nut 70 abuts against the second end of the base 10.

[0069] Specifically, the outer surface of the first connecting cylinder 21 is machined with external threads, achieving double fixation by screwing in the first locking nut 70. One end of the first locking nut 70 tightly abuts against the second end face of the base 10, both firmly fixing the first connecting cylinder 21 to the base 10 through the threaded connection and enhancing connection stability through axial preload. This creates a reliable mechanical connection between the first connecting cylinder 21 and the base 10, preventing loosening or displacement of components due to high-pressure gas impact, and enhancing sealing performance through the tightening action of the first locking nut 70 to prevent high-pressure gas leakage. This double-fixed structure improves the reliability of the lifting device under high-pressure pulse gas impact. Furthermore, its simple and compact structure allows for long-term stable operation under harsh conditions without the need for complex seals, effectively extending equipment lifespan and reducing maintenance costs.

[0070] In one possible implementation, a polygonal boss 23 is axially provided on the outer surface of the second connecting cylinder 22, and the polygonal boss 23 is used to drive the second connecting cylinder 22 to rotate after being subjected to an external rotational force.

[0071] Specifically, the polygonal boss 23 and the second connecting cylinder 22 are integrally cast. The polygonal boss 23, which is axially arranged on the outer surface of the second connecting cylinder 22, is a rotary drive structure that is easy to operate manually or with tools. By using a matching polygonal wrench or tool to hold the polygonal boss 23, a rotational torque can be directly applied to drive the second connecting cylinder 22 to rotate, realizing threaded connection or disassembly as with the first connecting cylinder 21 or a high-pressure pulse valve. The polygonal boss 23 provides a stable and reliable point of rotational force application, avoiding the risk of slippage and improving operational safety.

[0072] In one possible implementation, the limiting structure 50 further includes:

[0073] The second locking nut 54 is screwed onto the piston rod 41 and abuts against the second end of the limiting plate 51.

[0074] Specifically, the second locking nut 54 in the limiting structure 50 is threadedly connected to the piston rod 41. The front end of the second locking nut 54 tightly abuts against the second end of the limiting plate 51, forming a double locking mechanism. The second locking nut 54 fixes the position of the limiting plate 51, preventing displacement or loosening during the axial movement of the piston rod 41. It also works in conjunction with the first locking nut 70 to adjust the preload between the limiting plate 51 and the limiting sleeve 52, thereby precisely controlling the working stroke and reset force of the piston structure 40. The second locking nut 54 can be independently adjusted to fine-tune the limiting stroke, adapting to different working conditions. Furthermore, it enhances the overall structure's vibration resistance, ensuring reliability under long-term high-frequency pulse operation.

[0075] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A circular high-pressure air knife, characterized in that, include: The base (10) is hollow and is axially and vertically installed on the wall of the coal bunker (60); the first end of the base (10) is flush with the inner wall of the coal bunker (60); A gas container (20) is provided, with its first end connected to a high-pressure gas source and its coaxial connection to the base (10); the second end face of the gas container (20) is flush with the end face of the base (10) near the coal bunker (60). A support structure (30) is installed inside the gas container (20); A piston structure (40) is mounted on the support structure (30); the piston structure (40) is used to move from an initial position to a working position under the push of high-pressure gas; A limiting structure (50) is fitted onto the piston structure (40). The limiting structure (50) is used to limit the distance that the piston structure (40) moves toward the inside of the coal bunker (60), and to drive the piston structure (40) back to the initial position after the high-pressure gas is removed. The initial position is the position of the piston structure (40) when the second end of the piston structure (40) is in close contact with the second end face of the gas container (20); in the working position, there is an annular gap between the second end of the piston structure (40) and the second end face of the gas container (20), and the high-pressure gas is ejected from the annular gap to impact the coal adhering to the wall of the coal bunker (60).

2. The circular high-pressure air knife according to claim 1, characterized in that, The gas container (20) includes: The first connecting cylinder (21) has its first end screwed to the inner surface of the base (10), and the first end face of the first connecting cylinder (21) is flush with the inner wall of the coal bunker (60). The second connecting cylinder (22) has its first end screwed to the inner surface of the second end of the first connecting cylinder (21); the outer surface of the second end of the second connecting cylinder (22) is screwed to a high-pressure gas source.

3. The circular high-pressure air knife according to claim 2, characterized in that, The support structure (30) includes: A cross support frame (31) is a cross-shaped frame, and multiple end faces of the cross support frame (31) are fixed to the inner wall of the second connecting cylinder (22); the center of the cross support frame (31) is located on the axis of the second connecting cylinder (22); High-pressure gas can flow through the gaps in the frame of the cross support (31).

4. The circular high-pressure air knife according to claim 3, characterized in that, The piston structure (40) includes: A piston rod (41) is axially movable and mounted on the cross support frame (31), and passes through the center of the cross support frame (31); A piston head (42) is coaxially connected to the second end of the piston rod (41); the piston head (42) includes a coaxial cone-shaped structure and a disk structure; the small end of the cone-shaped structure is connected to the first end of the piston rod (41), and the side wall of the large end of the cone-shaped structure is in contact with the inner wall of the first connecting cylinder (21); the disk structure is connected to the end face of the large end of the cone-shaped structure. High-pressure air acts on the conical surface of the piston head (42), pushing the piston head (42) to move towards the interior of the coal bunker (60); when the piston structure (40) is in the initial position, the end face of the disc structure is in close contact with the first end face of the first connecting cylinder (21); when the piston structure (40) is in the working position, there is an annular gap between the end face of the disc structure and the first end face of the first connecting cylinder (21).

5. The circular high-pressure air knife according to claim 4, characterized in that, The side surface of the cone-like structure of the piston head (42) is curved.

6. The circular high-pressure air knife according to claim 4, characterized in that, The limiting structure (50) includes: A limiting plate (51) is fitted onto the first end of the piston rod (41); A limiting sleeve (52) is fitted onto the piston rod (41), and the outer surface of the limiting sleeve (52) is fixed onto the cross support frame (31). Compression spring (53) is located between the cross support frame (31) and the limiting plate (51), and the compression spring (53) is fitted on the outer surface of the limiting sleeve (52) and the piston rod (41); When high-pressure gas is introduced, the piston head (42) moves toward the inside of the coal bunker (60) and drives the piston rod (41) to move to the end face of the limiting sleeve (52) and press against the first end of the limiting plate (51), so that the piston structure (40) reaches the working position; when the high-pressure gas is removed, the reaction force of the spring pushes the limiting sleeve (52) away from the limiting plate (51), and at the same time the limiting plate (51) drives the piston structure (40) back to the initial position.

7. The circular high-pressure air knife according to claim 2, characterized in that, The outer surface of the first connecting cylinder (21) is screwed with a first locking nut (70), and one end of the first locking nut (70) abuts against the second end of the base (10).

8. The circular high-pressure air knife according to claim 2, characterized in that, The outer surface of the second connecting cylinder (22) is provided with a polygonal boss (23) in the axial direction. The polygonal boss (23) is used to drive the second connecting cylinder (22) to rotate after being subjected to external rotational force.

9. The circular high-pressure air knife according to claim 6, characterized in that, The limiting structure (50) also includes: The second locking nut (54) is screwed onto the piston rod (41) and abuts against the second end of the limiting plate (51).

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