Anti-explosion type cloth bag dust collector for pulverized coal
By introducing a guide frame and a rotating rod limiting structure into the explosion-proof bag filter for pulverized coal, the problem of the explosion relief door easily closing was solved, achieving stable release of high-temperature and high-pressure gas and convenient equipment maintenance, thus improving safety and ease of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XUANHUA METALLURGY ENVIRONMENTAL PROTECTION SHEBEIZHIZAO INSTA
- Filing Date
- 2026-05-11
- Publication Date
- 2026-06-19
AI Technical Summary
Existing explosion-proof bag filters for pulverized coal are prone to the problem of the explosion relief door closing immediately after opening, which prevents the high-temperature and high-pressure gas and unburned pulverized coal particles in the filter chamber from being fully released. Furthermore, when adding an anti-back-closing structure, the ease of disassembly and assembly of the structure must be taken into account.
An explosion relief door structure including a guide frame, metal sheet, rotating rod, and limiting device is designed. The guide frame directs the explosive gas and flame upwards, and the rotating rod and limiting device prevent the explosion relief door from closing back. At the same time, it provides a stable elastic clamping force and a friction deceleration device to ensure the stability and convenient maintenance of the explosion relief door.
It effectively prevents flames and high-temperature gases from spreading horizontally, preventing secondary injuries, ensuring the full implementation of explosion venting operations, and improving the sealing stability and maintenance convenience of the explosion venting door.
Smart Images
Figure CN122230433A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of baghouse dust collectors for pulverized coal, specifically relating to an explosion-proof baghouse dust collector for pulverized coal. Background Technology
[0002] Explosion-proof baghouse dust collectors for pulverized coal are highly efficient dust removal devices specifically designed for handling flammable and explosive dust in pulverized coal preparation systems. They effectively purify the air while ensuring safe production.
[0003] Patent publication number CN203971615U relates to a baghouse dust collector for pulverized coal, including a filter box with an explosion-proof door. A dust collection hopper is located at the bottom of the filter box, and a connecting seat is located at the top of the explosion-proof door. An aluminum door panel is rotatably connected to the connecting seat via a pivot. The lower end of the aluminum door panel curves outwards, and a support plate seals the inner edge of the aluminum door panel to the filter box. A horizontally extending limiting rod is located on the filter box directly above the explosion-proof door, with a rubber buffer ring at its end. The distance between the limiting rod and the connecting seat is less than the length of the aluminum door panel. The beneficial effects of this patent are: the explosion-proof door is reasonably designed to effectively buffer the explosive force, reduce the destructive force caused by the explosion, and minimize losses; the addition of spray heads can moisten the pulverized coal, preventing excessively high coal temperatures from causing an explosion; and the air-filled box prevents dust from accumulating in the dust collection hopper and adhering to its surface.
[0004] The aforementioned patent has the effect of buffering the impact of an explosion and reducing the losses caused by the explosion. However, during the explosion-proof and explosion-venting operation, due to the lack of an anti-backflow structure, the explosion-venting door is prone to closing immediately after opening. This results in the inability to fully release the high-temperature and high-pressure gas and unburned coal powder particles in the filter chamber, leading to incomplete explosion venting. When adding an anti-backflow structure to address this issue, the ease of disassembly and assembly of the structure must be taken into account to ensure the smooth progress of maintenance work on the explosion-proof and explosion-venting components of the equipment. Summary of the Invention
[0005] The purpose of this invention is to provide an explosion-proof bag filter for pulverized coal to solve the problem of the explosion relief door closing immediately after being opened.
[0006] To achieve the above objectives, the present invention provides an explosion-proof baghouse dust collector for pulverized coal, comprising a filter chamber, a clean air chamber, several sets of ash hoppers, and an air duct. The clean air chamber is located at the top of the filter chamber, the several sets of ash hoppers are fixedly installed at the bottom of the filter chamber, the air duct is located at the back of the filter chamber, and the air duct is equipped with an air valve. Several explosion relief installation ports are provided on the front of the filter chamber. The invention also includes a door frame, which is fixedly installed within the explosion relief installation ports. A hinge assembly is provided on the surface of the door frame, and internally threaded blind holes are provided on the surface of the door frame. An explosion relief door is also included. The explosion relief door is rotatably connected to the door frame via a hinge assembly, and the sealing surface of the explosion relief door is adapted to fit the inner sealing surface of the door frame; the guide frame is fixedly connected to the blind hole of the door frame via bolts, and the guide frame is used to guide the flame generated by the explosion to be discharged upward in a preset direction; the metal sheet is fixedly installed on the bottom of the inner wall of the guide frame, the metal sheet is elastic, the metal sheet fits against the surface of the door frame, and the metal sheet that fits tightly against the lower end of the explosion relief door provides a continuous and stable elastic clamping force to its lower end.
[0007] In one or more embodiments of the present invention, a mounting base is fixedly installed on the surface of the guide frame, a support rod is fixedly installed on the inner wall of the mounting base, a concave assembly frame is fixedly installed on the top of the support rod, a circular shaft is fixedly passed through the inner wall of the concave assembly frame, and a rotating rod is rotatably installed on the circumferential surface of the circular shaft. The explosion relief door contacts the top of the rotating rod, and the rotating rod provides support and forms a limit for it.
[0008] In one or more embodiments of the present invention, the bottom of the inner wall of the concave assembly frame is provided with an arc-shaped positioning groove that is adapted to the circumferential surface of the rotating rod. The circumferential surface of the rotating rod fits into the arc-shaped positioning groove, and the concave assembly frame provides uniform support force to the rotating rod through the arc-shaped positioning groove.
[0009] In one or more embodiments of the present invention, a limiting device for temporarily supporting the explosion relief door is provided on the flow guide frame, and a friction deceleration device for improving operational stability is provided on the limiting device; the limiting device includes a bracket, a long rod, a nut, a limiting component, and a positioning seat. The bracket is fixedly installed on the surface of the flow guide frame. The flow guide frame moves vertically downward, causing the flow guide frame to move the metal sheet, the mounting seat, and the bracket downward together. The long rod slides through the top of the bracket. An external thread section is provided on the circumferential surface of the bracket. The nut is threadedly connected to the external thread section of the long rod. The limiting component is fixedly installed on the circumferential surface of the long rod. The long rod then drives the nut and the limiting component to move downward synchronously. The positioning seat is fixedly installed on the surface of the door frame. A limiting groove matching the shape of the limiting component is provided on the top of the positioning seat.
[0010] In one or more embodiments of the present invention, the nut is fitted to the bottom of the bracket, and loosening the nut releases the fixed relationship between the long rod and the bracket. The bottom of the limiting member is provided with an elastic protrusion.
[0011] In one or more embodiments of the present invention, the friction deceleration device includes a support frame, a fixing pin, a friction plate, a base plate, and an elastic rubber sheet. A downwardly moving limiting member has an elastic protrusion at its bottom that flexibly contacts the top end of a cylindrical rod. The support frame is fixedly mounted on the surface of a positioning seat. An assembly hole is provided on the surface of the support frame. The fixing pin is fixedly mounted in the assembly hole. The friction plate is fixedly mounted on one end face of the fixing pin. The base plate is fixedly mounted on the surface of the limiting member. The elastic rubber sheet is fixedly mounted on the side of the base plate away from the limiting member.
[0012] In one or more embodiments of the present invention, the friction plate has an inclined surface on the side away from the fixing pin, and the elastic rubber sheet has a corrugated anti-slip groove on the side away from the substrate. The corrugated anti-slip groove of the elastic rubber sheet first contacts the inclined surface of the friction plate, and then gradually adheres to the surface of the friction plate to form a bonding surface.
[0013] In one or more embodiments of the present invention, a Z-shaped spring sheet is provided at the bottom of the inner side of the support frame, and a cylindrical rod slides through the surface of the support frame. The cylindrical rod is fixedly connected to the top of the Z-shaped spring sheet. During the downward movement of the cylindrical rod, the Z-shaped spring sheet is axially compressed, and the compressed Z-shaped spring sheet undergoes elastic deformation.
[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. When the explosive gas and flame come into contact with the inner wall of the guide frame, they are released upwards under the rigid guidance of the guide frame. The directional guidance of the guide frame can effectively prevent the flame and high-temperature gas from spreading horizontally and downwards, avoiding secondary injury to on-site personnel caused by high-temperature flame splashes. At the same time, the rotating rod provides support and forms a limit, stabilizing the explosion relief door in the open and closed state. The rotating rod forms a reliable anti-back-closing limit for the explosion relief door, effectively preventing the explosion relief door from closing immediately after opening, ensuring that the explosion relief operation can be carried out fully and continuously.
[0015] 2. When the explosion relief door remains closed and sealed, the metal strip provides a continuous and stable elastic clamping force to its lower end. By providing a stable elastic clamping force to the lower end of the explosion relief door through the metal strip, the small vibrations of the explosion relief door caused by equipment operation can be effectively suppressed, ensuring the stability of the explosion relief door's closed seal.
[0016] 3. The positioning seat provides rigid support for the limiting component, ensuring the guide frame is stably held in the predetermined downward position. This temporary fixation of the guide frame by the limiting component allows the door frame and explosion relief door to be unobstructed, facilitating comprehensive inspection and replacement work by maintenance personnel. Simultaneously, the limiting component quickly disengages from the limiting slot upon upward movement. This temporary fixation design allows maintenance personnel to flexibly adjust the position of the guide frame, thereby improving the ease of disassembly and assembly during maintenance and meeting the needs for rapid inspection and reset after explosion venting.
[0017] 4. The contact surface between the elastic rubber sheet and the friction plate generates continuous sliding friction, forming uniform frictional resistance. By adding an elastic rubber sheet to the limiting component, the friction between the elastic rubber sheet and the friction plate forms downward damping, which can effectively improve the safety of the guide frame during downward movement. At the same time, the compressed Z-shaped spring sheet undergoes elastic deformation and applies a reverse elastic force to the cylindrical rod. Through the elastic reaction force of the Z-shaped spring sheet, in conjunction with the frictional resistance between the elastic rubber sheet and the friction plate, the downward impact of the limiting component is effectively buffered, ensuring the stability and safety of the guide frame downward movement. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of the filter chamber in one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the door frame and the explosion relief door in one embodiment of the present invention; Figure 3 This is a schematic diagram of the guide frame moving down to a predetermined position in one embodiment of the present invention; Figure 4 This is a schematic diagram of the overall structure of the guide frame in one embodiment of the present invention; Figure 5 As shown in one embodiment of the present invention Figure 4 Enlarged structural diagram at point A in the diagram; Figure 6 This is a schematic diagram of the positional structure of the limiting member and the positioning seat in one embodiment of the present invention; Figure 7 As shown in one embodiment of the present invention Figure 6 Enlarged structural diagram at point B in the diagram; Figure 8 This is a schematic diagram of the internal structure of the support frame in one embodiment of the present invention.
[0019] Explanation of key figure labels: 1. Filter chamber; 2. Clean air chamber; 3. Ash hopper; 4. Air duct; 5. Door frame; 6. Explosion relief door; 7. Guide frame; 8. Metal sheet; 9. Mounting base; 10. Support rod; 11. Concave assembly frame; 12. Round shaft; 13. Rotating rod; 21. Bracket; 22. Long rod; 23. Nut; 24. Limiting component; 25. Positioning seat; 26. Elastic protrusion; 31. Bearing frame; 32. Fixing pin; 33. Friction plate; 34. Base plate; 35. Elastic rubber sheet; 36. Z-shaped spring sheet; 37. Cylindrical rod. Detailed Implementation
[0020] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.
[0021] like Figures 1-8 As shown, one embodiment of the present invention is: an explosion-proof bag filter for pulverized coal, comprising a filter chamber 1, a clean air chamber 2, several sets of ash hoppers 3, and an air duct 4. The clean air chamber 2 is located at the top of the filter chamber 1, the several sets of ash hoppers 3 are fixedly installed at the bottom of the filter chamber 1, the air duct 4 is located at the back of the filter chamber 1, and several explosion relief installation ports are provided on the front of the filter chamber 1. The device also includes: a door frame 5, which is fixedly installed in the explosion relief installation ports, a hinge assembly is provided on the surface of the door frame 5, and internal thread blind holes are provided on the surface of the door frame 5; and an explosion relief door 6, which is connected by the hinge assembly. The explosion relief door 6 is rotatably connected to the door frame 5, and its sealing surface is adapted to fit the inner sealing surface of the door frame 5; the guide frame 7 is fixedly connected to the blind hole of the inner thread of the door frame 5 by bolts, and the guide frame 7 is used to guide the flame generated by the explosion to be discharged upward in a preset direction; the metal plate 8 is fixedly installed on the bottom of the inner wall of the guide frame 7, the metal plate 8 is elastic, the metal plate 8 fits against the surface of the door frame 5, and the metal plate 8 provides a stable elastic clamping force to the lower end of the explosion relief door 6, which can effectively suppress the small vibration of the explosion relief door 6 caused by the operation of the equipment.
[0022] A mounting base 9 is fixedly installed on the surface of the flow guide frame 7. A support rod 10 is fixedly installed on the inner wall of the mounting base 9. A concave assembly frame 11 is fixedly installed on the top of the support rod 10. A circular shaft 12 is fixedly passed through the inner wall of the concave assembly frame 11. A rotating rod 13 is rotatably installed on the circumference of the circular shaft 12. The rotating rod 13 forms a reliable anti-back-closing limit for the explosion relief door 6, effectively preventing the explosion relief door 6 from closing immediately after opening.
[0023] The bottom of the inner wall of the concave assembly frame 11 is provided with an arc-shaped positioning groove that matches the circumferential surface of the rotating rod 13. The circumferential surface of the rotating rod 13 fits into the arc-shaped positioning groove. By opening the arc-shaped positioning groove, the rotating rod 13 can obtain a uniform support force, ensuring the reliability of the limiting effect.
[0024] In this embodiment, when the internal pressure of the filter chamber 1 is within the preset normal operating range, the explosion relief door 6 remains closed and sealed. At this time, the metal sheet 8, which is tightly attached to the lower end of the explosion relief door 6, provides a continuous and stable elastic pressing force to its lower end. This force can effectively suppress the small vibration of the explosion relief door 6 caused by the operation of the equipment during the coal dust removal process, ensuring that the explosion relief door 6 and the door frame 5 are always in a stable closed and ready-to-trigger state under safe operating conditions. By providing a stable elastic pressing force to the lower end of the explosion relief door 6 through the metal sheet 8, the small vibration of the explosion relief door 6 caused by the operation of the equipment can be effectively suppressed, ensuring the stability of the closed and sealed state of the explosion relief door 6. When an explosion occurs inside the filter chamber 1 due to the combustion of coal dust, the air valve in the air duct 4 closes the air inlet and outlet first. The shock wave generated by the explosion, combined with the high temperature and high pressure of the combustion flue gas, causes the internal pressure of the filter chamber 1 to rise sharply and exceed the preset explosion pressure threshold of the explosion relief door 6. The explosion relief door 6 is triggered to open by the internal pressure and rotates upward around the hinge assembly, so that the door frame 5 on the filter chamber 1 forms an effective explosion relief channel. The high temperature and high pressure combustion gas and flame inside the filter chamber 1 are quickly released outward through the door frame 5. During the release process, the explosion gas and flame come into contact with the inner wall of the guide frame 7. Under the rigid guidance of the guide frame 7, they are released upward in a directional manner. Through the directional guidance of the guide frame 7, the flame and high temperature gas can be effectively blocked from spreading horizontally and downward, avoiding secondary injury to on-site operators caused by high temperature flame splash. As the deflector frame 7 guides the high-temperature, high-pressure gas and flame generated by the explosion upwards and releases them in a directional manner, the upward-rotating explosion relief door 6 first contacts the bottom of the rotating rod 13, and then applies an upward thrust to it, pushing the rotating rod 13 to rotate upwards around the circular axis 12 until the explosion relief door 6 rotates to a predetermined angle and then disengages from the rotating rod 13. The rotating rod 13 then automatically returns to its initial position under its own gravity. As the explosion relief process continues, the pressure inside the filter chamber 1 gradually drops to a stable state, causing the explosion relief door 6 to be pushed towards the door frame 5 by gravity. The explosion relief door 6 automatically closes. During this process, the explosion relief door 6 will contact the top of the rotating rod 13. The rotating rod 13 provides support and forms a limit, stabilizing the explosion relief door 6 in the open / closed state, keeping the explosion relief channel of the filter chamber 1 unobstructed and continuously releasing pressure until the pressure in the filter chamber 1 drops to a safe value. After the explosion relief operation is completed, maintenance personnel will carry out subsequent maintenance work. The rotating rod 13 forms a reliable anti-reverse closing limit for the explosion relief door 6, effectively preventing the explosion relief door 6 from closing immediately after opening, ensuring that the explosion relief operation is fully and continuously carried out.
[0025] Please see Figures 1-8In another embodiment of the present invention, based on the above embodiments, a limiting device for temporarily supporting the explosion relief door 6 is provided on the flow guide frame 7. The limiting device is provided with a friction deceleration device for improving operational stability. The limiting device includes a bracket 21, a long rod 22, a nut 23, a limiting member 24, and a positioning seat 25. The bracket 21 is fixedly installed on the surface of the flow guide frame 7. The long rod 22 slides through the top of the bracket 21. An external thread section is opened on the circumferential surface of the bracket 21. The nut 23 is threadedly connected to the external thread section of the long rod 22. The limiting member 24 is fixedly installed on the circumferential surface of the long rod 22. The positioning seat 25 is fixedly installed on the surface of the door frame 5. A limiting groove matching the shape of the limiting member 24 is opened on the top of the positioning seat 25. The limiting member 24 is used to firmly hold the flow guide frame 7 in a predetermined downward position, thereby temporarily fixing the flow guide frame 7 and keeping the door frame 5 and the explosion relief door 6 in an unobstructed state.
[0026] Nut 23 fits into the bottom of bracket 21, and elastic protrusion 26 is provided at the bottom of limiting member 24, which facilitates maintenance personnel to carry out inspections through easy disassembly and assembly.
[0027] The friction deceleration device includes a support frame 31, a fixing pin 32, a friction plate 33, a base plate 34, and an elastic rubber sheet 35. The support frame 31 is fixedly installed on the surface of the positioning seat 25. The surface of the support frame 31 has an assembly hole. The fixing pin 32 is fixedly installed in the assembly hole. The friction plate 33 is fixedly installed on one end face of the fixing pin 32. The base plate 34 is fixedly installed on the surface of the limiting member 24. The elastic rubber sheet 35 is fixedly installed on the side of the base plate 34 away from the limiting member 24. By utilizing the friction between the elastic rubber sheet 35 and the friction plate 33 to form downward damping, the safety of the guide frame 7 during the downward movement operation can be effectively improved.
[0028] The friction plate 33 has an inclined surface on the side away from the fixing pin 32, and the elastic rubber sheet 35 has a corrugated anti-slip groove on the side away from the base plate 34. By opening the corrugated anti-slip groove, the resistance can be further increased and the safety of operation can be improved.
[0029] The bottom of the support frame 31 is provided with a Z-shaped spring piece 36, and a cylindrical rod 37 slides through the surface of the support frame 31. The cylindrical rod 37 is fixedly connected to the top of the Z-shaped spring piece 36. Through the elastic reaction force of the Z-shaped spring piece 36, and in conjunction with the frictional resistance between the elastic rubber sheet 35 and the friction plate 33, the downward impact force of the limiting member 24 is effectively buffered.
[0030] In this embodiment, after the explosion-proof and venting operation is completed, during maintenance, the maintenance personnel loosen the fixing bolts between the guide frame 7 and the door frame 5 to release their rigid fixing relationship. Then, the guide frame 7 can be moved vertically downwards, causing the guide frame 7 to move the metal plate 8, mounting base 9, and bracket 21 downwards together. The bracket 21 further moves the long rod 22 downwards, and the long rod 22 then moves the nut 23 and the limiting member 24 downwards simultaneously. During the downward movement, the limiting member 24 first fits against the inner wall of the limiting groove, then... Slide smoothly downwards along the inner wall of the limiting slot until the limiting member 24 contacts the bottom of the inner wall of the limiting slot. The positioning seat 25 provides rigid support for the limiting member 24, thereby keeping the guide frame 7 firmly in the predetermined downward position. The rotating rod 13, which has moved down to the position, is completely disengaged from the explosion relief door 6. The guide frame 7 is temporarily fixed by the limiting member 24 in the predetermined downward position, so that the door frame 5 and the explosion relief door 6 are in an unobstructed state, which facilitates maintenance personnel to carry out comprehensive inspection and replacement work. After the maintenance work on the door frame 5 and the explosion relief door 6 is completed, the maintenance personnel pull the guide frame 7 upward. The guide frame 7 moves the metal plate 8, the mounting base 9 and the bracket 21 upward in sync. The bracket 21 moves the limiting part 24 upward in sync through the long rod 22 until the limiting part 24 is completely disengaged from the limiting slot. Then, the guide frame 7 is pulled upward until it is precisely aligned with the internal thread blind hole on the door frame 5. The bolt is then screwed into the internal thread blind hole to complete the maintenance and repositioning of the guide frame 7 and the door frame 5. Through the temporary fixing design, the maintenance personnel can flexibly adjust the position of the guide frame 7, thereby improving the ease of disassembly and assembly of the guide frame 7 during the maintenance process and meeting the needs of rapid maintenance and repositioning after explosion relief. When the limiting member 24 moves vertically downward along the limiting slot, the base plate 34 fixed on its surface moves downward synchronously. The base plate 34 then drives the elastic rubber sheet 35 to move downward. During the downward movement, the corrugated anti-slip groove of the elastic rubber sheet 35 first contacts the inclined surface of the friction plate 33, and then gradually adheres to the surface of the friction plate 33 to form a contact surface. At this time, when the limiting member 24 continues to move downward, the contact surface between the elastic rubber sheet 35 and the friction plate 33 generates continuous sliding friction, forming uniform frictional resistance. This resistance can effectively slow down the downward movement speed of the limiting member 24 and prevent it from colliding with the bottom of the inner wall of the limiting slot. By adding an elastic rubber sheet 35 to the limiting member 24 and using its friction with the friction plate 33 to form downward damping, the safety of the guide frame 7 during the downward movement operation can be effectively improved. When the elastic rubber sheet 35 contacts the friction plate 33 and generates sliding friction, the elastic protrusion 26 at the bottom of the downward-moving limiting member 24 flexibly contacts the top of the cylindrical rod 37. As the limiting member 24 continues to move downward, it pushes the cylindrical rod 37 to move downward. During the downward movement of the cylindrical rod 37, it forms an axial compression on the Z-shaped spring sheet 36. The compressed Z-shaped spring sheet 36 undergoes elastic deformation and applies a reverse elastic force to the cylindrical rod 37. This force is transmitted to the downward-moving limiting member 24 through the cylindrical rod 37, further enhancing the deceleration effect. Through the elastic reaction force of the Z-shaped spring sheet 36, in conjunction with the frictional resistance between the elastic rubber sheet 35 and the friction plate 33, the downward impact of the limiting member 24 is effectively buffered, ensuring the stability and safety of the downward movement of the guide frame 7.
[0031] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. An explosion-proof baghouse dust collector for pulverized coal, comprising a filter chamber (1), a clean air chamber (2), several sets of ash hoppers (3), and an air duct (4), characterized in that, The clean air chamber (2) is located at the top of the filter chamber (1), several sets of ash hoppers (3) are fixedly installed at the bottom of the filter chamber (1), the air duct (4) is located at the back of the filter chamber (1), and several explosion relief ports are provided on the front of the filter chamber (1). It also includes: Door frame (5), the door frame (5) is fixedly installed in the explosion relief installation port, the door frame (5) is provided with a hinge assembly on its surface, and the door frame (5) is provided with an internal thread blind hole on its surface; Explosion relief door (6), the explosion relief door (6) is rotatably connected to the door frame (5) through a hinge assembly, and the sealing surface of the explosion relief door (6) is adapted to fit the inner sealing surface of the door frame (5); The guide frame (7) is fixedly connected to the blind hole of the door frame (5) by bolts. The guide frame (7) is used to guide the flame generated by the explosion to be discharged upward in a preset direction. Metal sheet (8) is fixedly installed on the bottom of the inner wall of the guide frame (7). The metal sheet (8) is elastic and fits against the surface of the door frame (5).
2. The explosion-proof bag filter for pulverized coal according to claim 1, characterized in that, The guide frame (7) is fixedly mounted with a mounting base (9), and a support rod (10) is fixedly mounted on the inner wall of the mounting base (9). A concave assembly frame (11) is fixedly mounted on the top of the support rod (10), and a round shaft (12) is fixedly passed through the inner wall of the concave assembly frame (11). A rotating rod (13) is rotatably mounted on the circumferential surface of the round shaft (12).
3. The explosion-proof bag filter for pulverized coal according to claim 2, characterized in that, The bottom of the inner wall of the concave assembly frame (11) is provided with an arc-shaped positioning groove that is adapted to the circumferential surface of the rotating rod (13), and the circumferential surface of the rotating rod (13) fits into the arc-shaped positioning groove. The guide frame (7) is provided with a limiting device for temporarily supporting the explosion relief door (6), and the limiting device is provided with a friction deceleration device for improving operational stability.
4. The explosion-proof bag filter for pulverized coal according to claim 3, characterized in that, The limiting device includes a bracket (21), a long rod (22), a nut (23), a limiting component (24), and a positioning seat (25). The bracket (21) is fixedly installed on the surface of the guide frame (7). The long rod (22) slides through the top of the bracket (21). The circumferential surface of the bracket (21) is provided with an external thread section. The nut (23) is threadedly connected to the external thread section of the long rod (22). The limiting component (24) is fixedly installed on the circumferential surface of the long rod (22). The positioning seat (25) is fixedly installed on the surface of the door frame (5). The top of the positioning seat (25) is provided with a limiting groove that matches the shape of the limiting component (24).
5. The explosion-proof bag filter for pulverized coal according to claim 4, characterized in that, The nut (23) is attached to the bottom of the bracket (21), and the bottom of the limiting member (24) is provided with an elastic protrusion (26).
6. The explosion-proof bag filter for pulverized coal according to claim 5, characterized in that, The friction deceleration device includes a support frame (31), a fixing pin (32), a friction plate (33), a base plate (34), and an elastic rubber sheet (35). The support frame (31) is fixedly installed on the surface of the positioning seat (25). The surface of the support frame (31) is provided with an assembly hole. The fixing pin (32) is fixedly installed in the assembly hole. The friction plate (33) is fixedly installed on one end face of the fixing pin (32). The base plate (34) is fixedly installed on the surface of the limiting member (24). The elastic rubber sheet (35) is fixedly installed on the side of the base plate (34) away from the limiting member (24).
7. The explosion-proof bag filter for pulverized coal according to claim 6, characterized in that, The friction plate (33) has an inclined surface on the side away from the fixing pin (32), and the elastic rubber sheet (35) has a corrugated anti-slip groove on the side away from the substrate (34).
8. The explosion-proof bag filter for pulverized coal according to claim 7, characterized in that, The bottom of the support frame (31) is provided with a Z-shaped spring piece (36), and a cylindrical rod (37) slides through the surface of the support frame (31). The cylindrical rod (37) is fixedly connected to the top of the Z-shaped spring piece (36).