Alternative fuel dust hood filtration device and dust hood

Abstract

The utility model relates to light alternative fuel conveying process's dust collection technical field discloses an alternative fuel dust hood filter device and dust hood. The alternative fuel dust hood filter device includes first connecting ring board, and the outside of the air pipe air outlet end is covered, second connecting ring board, and the outside of dust hood body air inlet end is covered, and the clearance is formed between first connecting ring board with second connecting ring board, filter assembly, the edge of filter assembly is respectively with the edge rotation connection of first connecting ring board and second connecting ring board, is used for rotating to the impurity in airflow in the clearance and carries out filtration, two groups of magnetic sealing assembly, respectively set up between first connecting ring board and filter assembly and between second connecting ring board and filter assembly, are used for cooperation sealing. The alternative fuel dust hood filter device can effectively intercept the large particle impurity in air intake, reduces the risk of cover mouth blockage, reduces the filter screen replacement difficulty simultaneously, and the maintenance time -consuming is shortened.

Description

Technical Field

[0001] This utility model relates to the field of dust collection technology in the transportation process of lightweight alternative fuels, specifically to an alternative fuel dust collection hood filter device and a dust collection hood. Background Technology

[0002] For a long time, cement kilns have primarily used waste textiles and industrial solid waste as raw materials to produce RDF (Regenerative Thermal Dioxide) alternative fuel. Among these, RDF made from waste textiles is widely favored by cement companies due to its advantages such as complete combustion, stable calorific value (typically >4500 kcal / kg), controllable chlorine content, and uniform physical morphology. In the alternative fuel processing stage, dust collection hoods play a crucial role in dust collection and environmental pollution control.

[0003] Currently, most dust collection hoods lack front-end filters. This not only leads to frequent blockages of the hood openings by large particles, requiring operators to stop the machine frequently for cleaning and impacting production efficiency, but also allows fibrous fuel to be sucked into the pipes and become entangled in the internal components of the dust collection equipment, interfering with its stable operation. To avoid these problems, some manufacturers choose to install fixed metal filters at the front of the dust collection hood to intercept large particles. However, replacing these welded fixed filters requires disassembling the entire dust collection hood, resulting in time-consuming maintenance. Utility Model Content

[0004] The purpose of this utility model is to solve at least one of the technical problems existing in the prior art, and to provide an alternative fuel dust collection hood filter device and a dust collection hood. The alternative fuel dust collection hood filter device can effectively intercept large particulate impurities in the incoming air, reduce the risk of hood blockage, and at the same time optimize the filter screen installation structure, reduce the difficulty of replacement, and shorten the maintenance time.

[0005] To achieve the above objectives, this utility model provides an alternative fuel dust collection hood filter device, located at the connection between the air outlet of the duct and the air inlet of the dust collection hood body, comprising: The first connecting ring plate is sleeved on the outside of the air outlet end of the air duct; The second connecting ring plate is sleeved on the outside of the air inlet end of the dust collection hood body, and a gap is formed between it and the first connecting ring plate; A filter assembly, the edges of which are rotatably connected to the edges of the first connecting ring plate and the second connecting ring plate, respectively, for rotating into the gap to filter impurities in the airflow; Two sets of magnetic sealing assemblies are respectively disposed between the first connecting ring plate and the filter assembly and between the second connecting ring plate and the filter assembly, for use in sealing.

[0006] Optionally, the first connecting ring plate includes a first annular plate and a first annular protrusion disposed on the top outer edge of the first annular plate, and the second connecting ring plate includes a second annular plate and a second annular protrusion disposed on the bottom outer edge of the second annular plate.

[0007] Optionally, the alternative fuel dust collection hood filter device further includes a rotating shaft assembly, the two ends of which are respectively connected to the first annular convex plate and the second annular convex plate.

[0008] Optionally, the filtering component includes: The frame is ring-shaped and is rotatably connected to the rotating shaft assembly. A filter assembly, which is detachably connected to the frame, and the outer diameter of the filter assembly matches the inner diameter of the frame.

[0009] Optionally, the magnetic sealing assembly includes: An annular groove is formed on the top of the second annular plate or the top of the frame; The magnetic sealing strip is ring-shaped and is embedded in the ring groove.

[0010] Optionally, the rotating shaft assembly includes: A shaft, the middle section of which is rotatably connected to the frame, and threaded sections at both ends of the shaft; Two sets of rotary locking components are threaded to both ends of the shaft, and the two sets of rotary locking components abut against the end faces of the first annular convex plate and the second annular convex plate, respectively. A limiting sleeve is fitted onto the outside of the shaft, and one end of the limiting sleeve abuts against the end face of the frame.

[0011] Optionally, the frame is provided with a handle extending radially along the side away from the pivot assembly, and the outer surface of the handle is provided with an anti-slip mechanism and a fluorescent coating.

[0012] Optionally, the filter assembly further includes a locking mechanism, the locking mechanism comprising: A locking hole extends through the handle along its axial direction; Two positioning screw holes are respectively provided on the end faces of the first annular convex plate and the second annular convex plate, and correspond to the position of the locking screw hole after it is in place; A locking bolt passes through the locking hole and is threadedly connected to the two positioning screw holes.

[0013] The second aspect of this utility model provides a dust collection hood, which includes a dust collection hood body and an alternative fuel dust collection hood filter device as described above. The dust collection hood body is configured with a flared structure that is smaller at the top and larger at the bottom.

[0014] Optionally, the dust collection hood further includes an inspection door, which is located on the side wall of the dust collection hood body.

[0015] Through the above technical solution, the filter assembly can rotate into the gap between the first and second connecting ring plates to directly intercept impurities in the airflow, preventing large particles from entering the dust collection hood body and ensuring the processing efficiency of the dust collection system; two sets of magnetic sealing components act between the connecting ring plates and the filter assembly, actively fitting and sealing to ensure the sealing performance of the connection; the edge of the filter assembly is rotatably connected to the connecting ring plate, avoiding the repeated disassembly of the air duct and dust collection hood body during the disassembly and assembly of traditional fixed filter devices. When cleaning or replacing the filter assembly is required, it is only necessary to rotate the filter assembly out of the gap to replace the filter screen, which is convenient and shortens the maintenance time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the working state of the alternative fuel dust collection hood filter device provided by this utility model; Figure 2 This is a schematic diagram of the structure of the alternative fuel dust collection hood filter device provided by this utility model in the open state.

[0017] Figure 3 yes Figure 1 Top view; Figure 4 yes Figure 2 Top view; Figure 5 yes Figure 3 Schematic diagram of section AA; Figure 6 yes Figure 4 Schematic diagram of the BB section; Figure 7 yes Figure 5 Enlarged schematic diagram of position I in the middle; Figure 8 yes Figure 6 Enlarged schematic diagram of position II in the middle; Figure 9 This is an installation diagram of an alternative fuel dust collection hood filter device provided by this utility model.

[0018] Explanation of reference numerals in the attached figures 1. First connecting ring plate; 11. First annular plate; 12. First annular convex plate; 2. Second connecting ring plate; 21. Second annular plate; 22. Second annular convex plate; 3. Filter assembly; 31. Frame; 32. Filter screen assembly; 33. Handle; 34. Locking mechanism; 341. Locking hole; 342. Positioning screw hole; 343. Locking bolt; 4. Magnetic sealing assembly; 41. Magnetic sealing strip; 42. Annular groove; 5. Rotary shaft assembly; 51. Shaft; 52. Rotary locking component; 53. Limiting sleeve; 100. Dust collection hood body; 101. Inspection door; 200. Air duct. Detailed Implementation

[0019] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0020] Combination Figure 1 and Figure 9 As shown, this utility model provides an alternative fuel dust collection hood filter device, which is located at the connection between the air outlet of the duct 200 and the air inlet of the dust collection hood body 100, i.e., for the air inlet of the dust collection hood body 100. The alternative fuel dust collection hood filter device includes a first connecting ring plate 1, which is sleeved on the outside of the air outlet of the duct 200; a second connecting ring plate 2, which is sleeved on the outside of the air inlet of the dust collection hood body 100, and forms a gap with the first connecting ring plate 1; a filter assembly 3, the edges of which are rotatably connected to the edges of the first connecting ring plate 1 and the second connecting ring plate 2, respectively, for rotating into the gap to filter impurities in the airflow; and two sets of magnetic sealing assemblies 4, which are respectively disposed between the first connecting ring plate 1 and the filter assembly 3 and between the second connecting ring plate 2 and the filter assembly 3, for sealing.

[0021] The alternative fuel dust collection hood filter device provided by this utility model first has a first connecting ring plate 1 fitted onto the outside of the air outlet of the air duct 200, and a second connecting ring plate 2 fitted onto the outside of the air inlet of the dust collection hood body 100. The gap between the two provides space for the installation and rotation of the filter assembly 3. The edge of the filter assembly 3 is connected to the first connecting ring plate 1 and the second connecting ring plate 2 respectively through a rotating connection structure. In the working state, the filter assembly 3 is rotated to be within the gap, filtering the airflow from the air duct 200 to the dust collection hood body 100, intercepting large particulate impurities and fibrous fuel, thereby purifying the airflow and preventing impurities from clogging the hood opening and entangled in the internal components of the dust collection equipment.

[0022] In this invention, when cleaning or replacing the filter assembly 3 in the alternative fuel dust collection hood filter device, the operator does not need to disassemble the entire dust collection hood. They only need to overcome the magnetic force of the magnetic sealing assembly 4 and rotate the filter assembly 3 around its edge to create a gap, thus allowing for maintenance or replacement. It is understood that the magnetic sealing assembly 4 in this invention is made of magnetic material. When the filter assembly 3 is in the filtering position, it is tightly attracted to the first connecting ring plate 1 and the second connecting ring plate 2, achieving a seal. When the filter assembly 3 is rotated, the magnetic force is overcome, and the filter assembly 3 can be easily rotated out. Then, by rotating the filter assembly 3 back into the gap and relying on the attraction force of the magnetic sealing assembly 4, the filter assembly 3 is fixed and sealed. Compared to the welded metal filter screen used in the prior art, which requires complete disassembly of the dust collection hood and duct 200 during replacement, the alternative fuel dust collection hood filter device provided by this invention can significantly shorten maintenance time, reduce maintenance difficulty, reduce downtime caused by filter screen replacement, and improve the continuity and production efficiency of cement kiln production using alternative fuels.

[0023] Specifically, in this utility model, combined with Figure 7 and Figure 8 As shown, the first connecting ring plate 1 includes a first annular plate 11 and a first annular protrusion 12 disposed on the top outer edge of the first annular plate 11. The second connecting ring plate 2 includes a second annular plate 21 and a second annular protrusion 22 disposed on the bottom outer edge of the second annular plate 21. The first annular plate 11 and the second annular plate 21 extend along their own axial direction, and a gap is formed between their adjacent end faces to provide rotation and installation space for the filter assembly 3, allowing the filter assembly 3 to flexibly rotate into the gap and effectively intercept and filter impurities in the airflow. The first annular protrusion 12 and the second annular protrusion 22 extend along their own radial direction.

[0024] Furthermore, combined Figure 3 , Figure 4 as well as Figure 5 As shown, the alternative fuel dust collection hood filter device also includes a rotating shaft assembly 5, with both ends of the rotating shaft assembly 5 connected to the first annular convex plate 12 and the second annular convex plate 22, respectively, to provide a reliable rotation fulcrum for the filter assembly 3.

[0025] In some embodiments, combined with Figure 2 and Figure 6 As shown, the filter assembly 3 includes a frame 31 and a filter screen assembly 32. Specifically, the frame 31 is annular and rotatably connected to the rotating shaft assembly 5. It provides a stable support structure for the filter screen assembly 32 and drives the filter screen assembly 32 to move accurately to the filtration position during rotation. The filter screen assembly 32 is detachably connected to the frame 31, and the outer diameter of the filter screen assembly 32 matches the inner diameter of the frame 31.

[0026] Understandably, in order to enhance the sealing performance of the filter assembly 3 when it is in the working position, the frame 31 in the filter assembly 3 can be made of any suitable material, as long as it can achieve tight adhesion with the magnetic sealing assembly 4, its own strength can withstand the impact of high-temperature airflow, and it can ensure that the frame 31 is not easily deformed during long-term use. For example, magnetic stainless steel.

[0027] In this invention, the connection between the filter assembly 32 and the frame 31 can be any suitable method, as long as it ensures quick assembly / disassembly and stable fixation. For example, an embedded snap-fit ​​structure can be used, allowing the filter assembly 32 to be quickly inserted and ejected by pressing the snap-fit; or a magnetic connection can be used, using magnetic attraction to fix the filter assembly 32, facilitating quick replacement without tools; or bolt fastening can be used to provide more stable connection strength. To further improve the stability and sealing of the filter assembly 32 installation, in some embodiments, the inner sidewall of the frame 31 is provided with an annular groove for embedding into the edge of the filter assembly 32, making the fit between the filter assembly 32 and the frame 31 tighter, preventing airflow from leaking from the gap between the filter assembly 32 and the frame 31, and also positioning the filter assembly 32 to ensure accurate installation.

[0028] In this utility model, the rotating shaft assembly 5 includes a shaft 51, two sets of rotating locking members 52, and a limiting sleeve 53. The middle section of the shaft 51 is rotatably connected to the frame 31, and both ends of the shaft 51 are provided with threaded sections; the two sets of rotating locking members 52 are respectively threaded to both ends of the shaft 51, and the two sets of rotating locking members 52 respectively abut against the end faces of the first annular convex plate 12 and the second annular convex plate 22; the limiting sleeve 53 is sleeved on the outside of the shaft 51, and one end of the limiting sleeve 53 abuts against the end face of the frame 31.

[0029] Understandably, during the specific installation of the rotating shaft assembly 5, the annular frame 31 is first placed in the gap formed by the close-to-each end faces of the first connecting ring plate 1 and the second connecting ring plate 2, so that the frame 31 is in the preset position when the filter assembly 3 is working. Next, to limit the axial movement of the filter assembly 3 and reduce the sway of the frame 31, a limiting sleeve 53 is placed on the lower side of the frame 31, or two limiting sleeves 53 are placed on the upper and lower sides of the frame 31 respectively, ensuring that the limiting sleeves 53 are in contact with the end faces of the frame 31. Subsequently, the shaft 51 is passed sequentially through the first annular protrusion 12, the frame 31, the limiting sleeve 53, and the second annular protrusion 22. The middle section of the shaft 51 is rotatably connected to the frame 31, ensuring that the frame 31 can rotate flexibly around the shaft 51. The threaded sections at both ends of the shaft 51 extend to the top of the first annular protrusion 12 and the top of the second annular protrusion 22, respectively, providing a foundation for the installation of the rotating locking member 52. Finally, the two sets of rotating locking parts 52 are screwed into the threaded sections at both ends of the shaft 51. By rotating, the locking parts are made to tightly abut against the end faces of the first annular convex plate 12 and the second annular convex plate 22 respectively. The shaft 51 is firmly fixed on the first connecting ring plate 1 and the second connecting ring plate 2 by the thread fastening force, thereby realizing a reliable connection between the rotating shaft assembly 5 and the entire filter device.

[0030] In some embodiments, the shaft 51 may be a bolt, which passes through the annular convex plate, the frame 31 and the sleeve in sequence, with one end away from the nut extending from the top of the first annular convex plate 12 or the bottom of the second annular convex plate 22, and is fastened in conjunction with the nut.

[0031] In this utility model, combined with Figure 4 , Figure 7 as well as Figure 8 As shown, the magnetic sealing assembly 4 includes an annular groove 42 and a magnetic sealing strip 41. The annular groove 42 is formed on the top of the second annular plate 21 or the top of the frame 31. The magnetic sealing strip 41 is annular and is embedded in the annular groove 42.

[0032] It is understandable that for the magnetic sealing assembly 4 located between the first connecting ring plate 1 and the filter assembly 3, its annular groove 42 is opened at the top of the frame 31, and its magnetic sealing strip 41 is embedded in the annular groove 42 at the top of the frame 31 and completely fits the inner wall of the annular groove 42. When the filter assembly 3 is rotated to the working position, the magnetic sealing strip 41 at the top of the frame 31 is tightly fitted with the bottom of the first annular plate 11, and the seal between the frame 31 and the first annular plate 11 is achieved by using the adsorption force of the magnetic sealing strip 41.

[0033] For the magnetic sealing assembly 4 located between the second connecting ring plate 2 and the filter assembly 3, its annular groove 42 is formed on the top of the second annular plate 21. After the second annular plate 21 is fitted onto the outside of the air inlet end of the dust collection hood body 100, the annular magnetic sealing strip 41 can be directly embedded into the annular groove 42 on the top of the second annular plate 21, ensuring that the magnetic sealing strip 41 completely fits the inner wall of the annular groove 42 without twisting or protrusion. At this time, when the filter assembly 3 rotates to the working position, the bottom of the frame 31 will be in close contact with the top of the second annular plate 21 with the embedded magnetic sealing strip 41. The magnetic sealing strip 41 relies on its own magnetism to attract each other to the bottom of the frame 31, forming a sealing structure between the two, which can prevent airflow from leaking from the connection between the frame 31 and the second annular plate 21. When maintenance or repair of the filter assembly 3 is required, the operator rotates the filter assembly 3 out of the working position. At this time, the magnetic sealing strips 41 in the two sets of magnetic sealing assemblies 4 separate from the corresponding parts. Since the magnetic sealing strips 41 are embedded in the annular grooves 42, they will not fall off or shift with the rotation of the filter assembly 3. After the repair is completed, the filter assembly 3 is rotated back to the working position, and the two sets of magnetic sealing strips 41 can quickly and tightly adhere to the corresponding parts by magnetic force, restoring the sealing function. The whole process is convenient and does not affect the sealing performance and efficiency of the device.

[0034] It is understandable that, in order to avoid magnetic interference, in some embodiments, the inner wall of the annular groove 42 is provided with a non-magnetic coating. In order to adapt to the complex working conditions of high temperature and high dust in the alternative fuel treatment process of cement kilns and to ensure that the magnetic sealing component 4 maintains stable sealing performance during long-term operation, in some embodiments, the magnetic sealing strip 41 may be a rubber neodymium iron boron composite magnetic sealing strip with a temperature resistance of 200℃.

[0035] The rubber matrix in this material endows the sealing strip with excellent flexibility and deformation recovery, allowing it to fit tightly against the annular groove 42 and the surface of the connecting components, effectively filling gaps. The neodymium iron boron magnetic particles provide strong and durable adsorption force, ensuring stable adsorption with magnetically conductive components such as the connecting ring plate and frame 31. Even when the local temperature of the dust collection system rises to nearly 200°C due to changes in production load, the magnetic sealing strip 41 made of rubber-neodymium iron boron composite material can still maintain stable physical and magnetic properties, avoiding problems such as deformation, demagnetization, or sealing failure due to high temperatures.

[0036] In some embodiments, combined with Figure 3 and Figure 4As shown, to facilitate the rotation of the filter assembly 3, in some embodiments, a handle 33 extending radially along the side of the frame 31 away from the rotating shaft assembly 5 is provided. The outer surface of the handle 33 is provided with an anti-slip mechanism and a fluorescent coating. Specifically, during the operation and maintenance of the dust collection hood, operators need to frequently rotate the filter assembly 3. The handle 33 provides a point of leverage, making operation more labor-saving and efficient compared to directly applying force to the frame 31.

[0037] Understandably, the anti-slip mechanism can use textured surfaces or silicone anti-slip sleeves to ensure a stable grip and prevent slippage even if the operator's hands are covered in dust or oil. The fluorescent coating is designed for nighttime maintenance scenarios, allowing operators to quickly locate the handle at position 33 in low-light conditions.

[0038] To maintain the stability of the filter assembly 3 during operation and prevent accidental rotation of the filter assembly 3 due to factors such as airflow impact and equipment vibration, in some embodiments, the filter assembly 3 further includes a locking mechanism 34. Specifically, the locking mechanism 34 includes a locking hole 341 that passes through the handle 33 along the axial direction; two positioning screw holes 342 that are respectively provided on the end faces of the first annular convex plate 12 and the second annular convex plate 22 and correspond to the position of the locking hole 341 after it is in place; and a locking bolt 343 that passes through the locking hole 341 and is threadedly connected to the two positioning screw holes 342.

[0039] When the filter assembly 3 is rotated to the working position, the operator can pass the locking bolt 343 through the locking hole 341 of the handle 33, align it with the positioning screw hole 342 on the end face of the first annular convex plate 12 and the second annular convex plate 22 and tighten it, thereby making the entire filter assembly 3 firmly locked and effectively restricting its rotational freedom.

[0040] like Figure 9 As shown, the second aspect of this utility model provides a dust collection hood, which includes a dust collection hood body 100 and the aforementioned alternative fuel dust collection hood filter device. The dust collection hood body 100 is configured with a flared structure that is smaller at the top and larger at the bottom. By introducing the aforementioned alternative fuel dust collection hood filter device at the air inlet end of the dust collection hood body 100, large particulate impurities and fibrous fuels can be effectively intercepted, preventing them from clogging the dust collection hood opening and entangled in the internal components of the dust collection equipment, thus ensuring the smooth operation of the dust collection system. The flared structure of the dust collection hood body 100, which is smaller at the top and larger at the bottom, works in conjunction with the filter device to guide airflow more evenly through the filter screen assembly 32, allowing the filter device to fully exert its filtration effect. In addition, the detachable design of the filter screen assembly 32 in the filter device makes it more convenient for operators to maintain the dust collection hood, improving the practicality and applicability of the dust collection hood in the alternative fuel treatment process of cement kilns.

[0041] Furthermore, the dust collection hood also includes an inspection door 101, which is located on the side wall of the dust collection hood body 100. The inspection door 101 can be installed using a hinged or sliding rail connection, allowing for flexible opening and closing. By providing the inspection door 101, operators can directly observe the dust accumulation inside the dust collection hood and the working status of the filter device during equipment operation without disassembling the entire dust collection hood.

[0042] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including the combination of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A dust collection hood filter device for alternative fuels, located at the connection between the air outlet of the duct (200) and the air inlet of the dust collection hood body (100), characterized in that, include: The first connecting ring plate (1) is sleeved on the outside of the air outlet end of the air duct (200); The second connecting ring plate (2) is sleeved on the outside of the air inlet end of the dust collection hood body (100) and forms a gap with the first connecting ring plate (1); The filter assembly (3) has its edges rotatably connected to the edges of the first connecting ring plate (1) and the second connecting ring plate (2), respectively, and is used to rotate into the gap to filter impurities in the airflow; Two sets of magnetic sealing components (4) are respectively disposed between the first connecting ring plate (1) and the filter component (3) and between the second connecting ring plate (2) and the filter component (3) for sealing.

2. The alternative fuel dust collection hood filter device according to claim 1, characterized in that, The first connecting ring plate (1) includes a first annular plate (11) and a first annular protrusion (12) disposed on the top outer edge of the first annular plate (11). The second connecting ring plate (2) includes a second annular plate (21) and a second annular protrusion (22) disposed on the bottom outer edge of the second annular plate (21).

3. The alternative fuel dust collection hood filter device according to claim 2, characterized in that, The alternative fuel dust collection hood filter device also includes a rotating shaft assembly (5), the two ends of which are connected to the first annular convex plate (12) and the second annular convex plate (22), respectively.

4. The alternative fuel dust collection hood filter device according to claim 3, characterized in that, The filter component (3) includes: The frame (31) is ring-shaped and is rotatably connected to the rotating shaft assembly (5); A filter assembly (32) is detachably connected to the frame (31), and the outer diameter of the filter assembly (32) matches the inner diameter of the frame (31).

5. The alternative fuel dust collection hood filter device according to claim 4, characterized in that, The magnetic sealing assembly (4) includes: An annular groove (42) is formed on the top of the second annular plate (21) or the top of the frame (31); The magnetic sealing strip (41) is annular and is embedded in the annular groove (42).

6. The alternative fuel dust collection hood filter device according to claim 4, characterized in that, The rotating shaft assembly (5) includes: A shaft (51) is rotatably connected to the frame (31) in the middle section, and threaded sections are provided at both ends of the shaft (51). Two sets of rotating locking parts (52) are threaded to both ends of the shaft (51), and the two sets of rotating locking parts (52) abut against the end faces of the first annular convex plate (12) and the second annular convex plate (22), respectively. A limiting sleeve (53) is sleeved on the outside of the shaft (51), and one end of the limiting sleeve (53) abuts against the end face of the frame (31).

7. The alternative fuel dust collection hood filter device according to claim 4, characterized in that, The frame (31) is provided with a handle (33) extending radially along the side away from the pivot assembly (5), and the outer surface of the handle (33) is provided with an anti-slip mechanism and a fluorescent coating.

8. The alternative fuel dust collection hood filter device according to claim 7, characterized in that, The filter assembly (3) further includes a locking mechanism (34), which includes: A locking hole (341) extends through the handle (33) along the axial direction of the handle (33). Two positioning screw holes (342) are respectively provided on the end faces of the first annular convex plate (12) and the second annular convex plate (22), and correspond to the position of the locking hole (341) after it is in place; A locking bolt (343) passes through the locking hole (341) and is threaded into the two positioning screw holes (342).

9. A dust collection hood, characterized in that, The dust collection hood includes a dust collection hood body (100) and an alternative fuel dust collection hood filter device as described in any one of claims 1-8, wherein the dust collection hood body (100) is configured with a flared structure that is smaller at the top and larger at the bottom.

10. The dust collection hood according to claim 9, characterized in that, The dust collection hood also includes an inspection door (101), which is located on the side wall of the dust collection hood body (100).

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