Pneumatic self-resetting spraying device capable of preventing blockage of stock bin

Abstract

The utility model discloses a pneumatic self-resetting injection device for preventing a stock bin from being blocked. The pneumatic self-resetting injection device is formed by sequentially connecting an air inlet pipeline mechanism, a pneumatic injection mechanism and a fixing mechanism, the pneumatic injection mechanism comprises an injection pipe, a first through hole is formed in the pipe wall of the injection pipe, an annular sliding block is arranged in an inner cavity of the injection pipe and axially moves along the injection pipe, a second through hole is formed in the wall of the annular sliding block, when the air inlet pipeline device supplies air, the first through hole and the second through hole can coincide through pneumatic force, and a pneumatic injection opening is opened to achieve injection of airflow into the bin; when air supply is stopped, the circular ring sliding block is reset under the action of the compression spring, the first through hole and the second through hole are staggered, the pneumatic jet orifice is closed, and the jet device is isolated from materials in the stock bin, so that the situation that the jet device is blocked and fails due to the fact that fine powder in the stock bin is sucked back into the jet pipe is avoided; the device is simple in overall structure, convenient to disassemble and assemble and long in service life.

Description

Technical Field

[0001] This utility model relates to the field of silo blockage prevention and control technology, specifically a pneumatic self-resetting injection device for preventing silo blockage. Background Technology

[0002] Materials within a silo primarily rely on their own gravity to slide and roll within the silo, achieving uniform settling from bottom to top. However, due to the properties of the material, the structure and dimensions of the silo, and other production factors, it is difficult for materials to flow as uniformly and systematically as liquids within the silo. In actual silo production, gravity-driven flow is an ideal material flow method, but it is difficult to achieve in practice. In reality, materials frequently experience blockages such as arching, bridging, and clumping within the silo, gradually reducing its effective volume and hindering its buffering function, thus impacting production. Pneumatic unblocking and flow-assisted cleaning can effectively solve the problem of silo blockage. For example, Chinese patent CN219688131U discloses a silo cleaning device for a four-sided pyramidal silo, and Chinese patent CN107416471B discloses a silo unblocking device and its usage method for preventing chute blockage. Both belong to the pneumatic flow-assisted unblocking method. However, the flow-assisted nozzles used have the following shortcomings: the nozzle has a simple structure, generally a section of steel pipe, and its head is in direct contact with the material. Long-term use can easily lead to powder and moisture entering the nozzle cavity, causing blockage of the nozzle and pipe. Utility Model Content

[0003] The purpose of this invention is to provide a pneumatic self-resetting injection device for preventing blockage in silos. By setting a double-layer nozzle for self-resetting, it can effectively prevent powder and moisture from entering the silo, thereby solving the problem of material entering the nozzle and causing blockage in the nozzle and pipeline mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a pneumatic self-resetting injection device for preventing blockage in a silo, comprising an air inlet pipe mechanism, a pneumatic injection mechanism, and a fixing mechanism, characterized in that: the air inlet pipe mechanism includes an air inlet pipe, which is welded to a first end cap, and the first end cap is connected and fixed to a flange metal hose by a second bolt assembly; the other end of the flange metal hose is connected to the second end cap of the pneumatic injection mechanism and the third end cap of the fixing mechanism.

[0005] The pneumatic injection mechanism includes an injection pipe, one end of which is welded to a second end cap, and the other end is welded to an end cap plate to form a sealed cavity; the end cap plate is connected to a guide cone; a cylindrical slider is provided in the middle of the sealed cavity of the injection pipe, and a compression spring is provided between the bottom of the cylindrical slider and the end cap plate; a first through hole and a second through hole are respectively opened in the pipe wall of the injection pipe and the cylindrical slider, and when air is introduced, the first through hole and the second through hole overlap to form a pneumatic injection port;

[0006] The fixing mechanism includes a sleeve, one end of which is welded to the third end cap, and the other end of which is fixed to the silo wall panel.

[0007] Preferably, the inner wall of the injection pipe and the outer wall of the cylindrical slider are provided with 2 to 3 sets of flat keyways. When there are two sets of flat keyways, they are arranged symmetrically in the radial direction at 180°. When there are three sets, each set is 90° apart in the radial direction. The flat keyways avoid the opening positions of the first through hole and the second through hole.

[0008] Preferably, the first through hole and the second through hole have the same opening size and an axial misalignment distance of 10-20mm; the first through hole is 30-80mm from the inner wall of the hopper.

[0009] Preferably, the flanged metal hose has a length of 300-400 mm, a maximum bending angle of 90°, and one end of the flanged metal hose is fixed while the other end is movable.

[0010] Preferably, the cylindrical slider is axially positioned by a flat keyway and a limiting ring, and a buffer washer is provided at the end of the limiting ring.

[0011] Preferably, the sleeve is perpendicular to the silo wall panel, and the pneumatic jet nozzle blows downward parallel to the inner wall of the silo.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] The pneumatic self-resetting injection device for preventing blockage in this silo works as follows: When the air inlet pipe mechanism is ventilated, the second through hole on the cylindrical slider coincides with the first through hole on the injection pipe, and the pneumatic injection port opens to allow airflow to be injected into the silo. When the air inlet pipe mechanism is not ventilated, the cylindrical slider resets under the action of the compression spring, the second through hole and the first through hole are misaligned, and the pneumatic injection port closes, thereby isolating the injection device from the material inside the silo and preventing fine powder from being sucked back into the injection pipe, causing blockage and failure of the injection device. The overall structure is simple, easy to disassemble and assemble, and has a long service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the spraying device of this utility model;

[0015] Figure 2 This is a schematic diagram of the injection pipe structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the cylindrical slider structure of this utility model;

[0017] Figure 4 This is a schematic diagram showing the position of the cylindrical slider during pneumatic injection according to this utility model.

[0018] In the diagram: 1. Inlet pipe; 2. First end cap; 3. Flange metal flexible hose; 5. Second end cap; 6. Sealing gasket; 7. Third end cap; 8. Sleeve; 9. Injection pipe; 903. First through hole; 10. First O-ring; 11. Flat key; 12. Cylindrical slider; 121. Front sealing ring groove; 123. Rear sealing ring groove; 125. Second through hole; 13. Second O-ring; 14. Compression spring; 15. End cover plate; 16. Guide cone; 17. Buffer washer; 18. Limiting ring; 19. Hopper wall panel; 20. First bolt assembly; 21. Second bolt assembly; 22. Flat keyway. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 This embodiment of a pneumatic self-resetting injection device for preventing blockage in a hopper consists of an air inlet pipe mechanism, a pneumatic injection mechanism, and a fixing mechanism connected in sequence. The air inlet pipe mechanism consists of an air inlet pipe 1, a first end cap 2, and a flanged metal hose 3 connected in sequence. The flanged metal hose 3 has flanges at both ends, one end being a fixed flange and the other end being a radially rotatable movable flange. The air inlet pipe 1 and the first end cap 2 are welded together. The first end cap 2 is connected to the fixed flange of the flanged metal hose 3 by a second bolt assembly 21. The maximum bending angle of the flanged metal hose 3 is 90°, which does not restrict the relative positional relationship between the air inlet pipe 1 and the pneumatic injection mechanism. The two can be arranged parallel or perpendicularly, which facilitates the positioning and installation of the pneumatic injection mechanism and the air inlet pipe mechanism.

[0021] The pneumatic injection mechanism in this embodiment includes a second end cap 5, a sealing gasket 6, an injection pipe 9, a first O-ring 10, a flat key 11, a cylindrical slider 12, a second O-ring 13, a compression spring 14, an end cover plate 15, a guide cone 16, a buffer washer 17, and a limiting ring 18. One end of the injection pipe 9 is welded to the second end cap 5, and the other end is welded to the end cover plate 15. The other side of the end cover plate 15 is welded to the guide cone 16. The cone angle of the guide cone 16 is 110° to 130°, preferably 118° to 122°, forming the head of the pneumatic injection mechanism, which facilitates the pneumatic injection mechanism to enter the interior of the compacted material hopper. Furthermore, the injection pipe 9, the second end cap 5, the end cover plate 15, and the guide cone 16 are all made of stainless steel. The outer walls of the injection pipe 9 and the guide cone 16 are pre-treated by sandblasting to Sa2.5 grade, and then subjected to chromium carbide thermal spraying twice. The coating thickness is 150 to 300 μm to enhance wear resistance and improve service life.

[0022] like Figure 2 and Figure 3 As shown, 2 to 3 sets of symmetrical flat keyways 22 are opened on the inner wall of the spray pipe 9 for axial guidance of the flat key 11. One end of the flat keyway 22 is also used to achieve axial positioning of the cylindrical slider 12 during movement. A first through hole 903 is opened on the spray pipe 9.

[0023] The inner cavity of the injection pipe 9 is also provided with a cylindrical slider 12. The inner cavity of the cylindrical slider 12 is hollow, and the outer wall of the cylindrical slider 12 is the same as the inner wall of the injection pipe 9, using a clearance fit. A front sealing ring groove 121 and a rear sealing ring groove 123 are respectively opened at both ends of the cylindrical slider 12. A first O-ring 10 is installed in the front sealing ring groove 121, and a second O-ring 13 is installed in the rear sealing ring groove 123, for dynamic sealing of the gas at both ends when the cylindrical slider 12 moves axially. The first O-ring 10 and the second O-ring 13 are made of fluororubber, which is pressure-resistant and corrosion-resistant. The outer wall of the cylindrical slider 12 is also provided with 2 to 3 sets of corresponding flat keyways 22, and the flat key 11 is fixed in the flat keyway 22. The cylindrical slider 12 is provided with a second through hole 125. The first through hole 903 and the second through hole 125 form a pneumatic injection port, such as Figure 4 As shown, it is used for airflow to be injected into the hopper; wherein, the first through hole 903 and the second through hole 125 have the same opening size; after the pneumatic action disappears (i.e. the initial position), the axial distance between the two is 10-20mm; the distance between the first through hole 903 and the inner wall of the hopper is 30-80mm, preferably 30-50mm.

[0024] In the above embodiments, the inner wall of the injection pipe 9 and the outer wall of the cylindrical slider 12 are coated with silicone grease or Teflon coating to reduce friction during the movement of the flat key 11. A compression spring 14 is provided between the bottom end of the cylindrical slider 12 and the end cover plate 15. The cylindrical slider 12 is made of stainless steel, and the compression spring 14 is a stainless steel type spring with an outer diameter reference. Both ends are ground, making it suitable for hole-fitting installation and ensuring a long service life. Specifically, after the pneumatic action, the cylindrical slider 12 moves axially in the air intake direction under the action of the compression spring 14. The limiting ring 18 is axially positioned and is made of stainless steel. A buffer washer 17 made of polytetrafluoroethylene is provided at the end of the limiting ring 18 near the cylindrical slider 12.

[0025] The fixing mechanism in this embodiment includes a sleeve and a silo wall panel 19. One end of the sleeve 8 is welded to the silo wall panel 19. If it is a concrete silo, it can be fixed by anchoring rebar or expansion bolts. The other end of the sleeve 8 is welded to the third end cap 7. The second end cap 5, the third end cap 7 and the movable flange of the flange metal hose 3 are connected and fixed by the first bolt assembly 20. The bolt assembly is grade 8.8 and equipped with spring washers and flat washers to prevent loosening. When the sleeve 8 is perpendicular to the silo wall panel 19, the pneumatic jet nozzle blows downward parallel to the inner wall of the silo.

[0026] In addition, the first end cover 2, the second end cover 5, and the third end cover 7 provided in this embodiment are all made of flanges of the same specifications, wherein the second end cover 5 is made of stainless steel, and the first end cover 2 and the third end cover 7 are made of carbon steel.

[0027] Working principle: The pneumatic self-resetting injection device for preventing clogging in the silo of this utility model introduces compressed gas into the air inlet pipe 1 of the air inlet pipe mechanism. The compressed gas is then delivered into the injection pipe 9 through the flange metal hose 3. Under the action of the pneumatic force, the cylindrical slider 12 is displaced, causing the second through hole 125 on the cylindrical slider 12 to coincide with the first through hole 903 on the injection pipe 9. The pneumatic injection port opens, allowing airflow to be injected into the silo. When the air supply stops, the cylindrical slider 12 resets under the action of the compression spring 14, the second through hole 125 and the first through hole 903 are misaligned, and the pneumatic injection port closes. This prevents fine powder from being sucked back into the injection device from the silo, thus achieving the effect of self-clogging and resetting.

[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pneumatic self-resetting injection device for preventing blockage in a silo, comprising an air inlet pipe mechanism, a pneumatic injection mechanism, and a fixing mechanism, characterized in that: The air intake pipe mechanism includes an air intake pipe (1), which is welded to a first end cap (2). The first end cap (2) is connected and fixed to a flange metal hose (3) by a second bolt assembly (21). The other end of the flange metal hose (3) is connected to the second end cap (5) of the pneumatic injection mechanism and the third end cap (7) of the fixing mechanism. The pneumatic injection mechanism includes an injection pipe (9), one end of which is welded to a second end cap (5), and the other end is welded to an end cap plate (15) to form a sealed cavity; the end cap plate (15) is connected to a guide cone (16); a cylindrical slider (12) is provided in the middle of the sealed cavity of the injection pipe (9), and a compression spring (14) is provided between the bottom of the cylindrical slider (12) and the end cap plate (15); the walls of the injection pipe (9) and the cylindrical slider (12) are respectively provided with a first through hole (903) and a second through hole (125), and when air is introduced, the first through hole (903) and the second through hole (125) overlap to form a pneumatic injection port; The fixing mechanism includes a sleeve (8), one end of which is welded to the third end cap (7), and the other end of which is fixed to the silo wall panel (19).

2. The pneumatic self-resetting injection device for preventing blockage in a silo according to claim 1, characterized in that: The inner wall of the injection pipe (9) and the outer wall of the cylindrical slider (12) are provided with 2 to 3 sets of flat keyways (22). When there are two sets of flat keyways (22), they are arranged symmetrically in the radial direction at 180°. When there are three sets, each set is 90° apart in the radial direction. The flat keyways (22) avoid the opening positions of the first through hole (903) and the second through hole (125).

3. The pneumatic self-resetting injection device for preventing blockage in a silo according to claim 1, characterized in that: The first through hole (903) and the second through hole (125) have the same opening size and an axial misalignment distance of 10-20mm; the first through hole (903) is 30-80mm away from the inner wall of the hopper.

4. The pneumatic self-resetting injection device for preventing blockage in a silo according to claim 1, characterized in that: The flange metal hose (3) has a length of 300-400mm and a maximum bending angle of 90°. One end of the flange metal hose (3) is fixed, and the other end is movable.

5. A pneumatic self-resetting injection device for preventing blockage in a silo according to claim 2, characterized in that: The cylindrical slider (12) is axially positioned by a flat keyway (22) and a limiting ring (18), and a buffer washer (17) is provided at the end of the limiting ring (18).

6. The pneumatic self-resetting injection device for preventing blockage in a silo according to claim 1, characterized in that: The sleeve (8) is perpendicular to the silo wall panel (19), and the pneumatic jet nozzle blows downward parallel to the inner wall of the silo.

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