Explosion-proof valve device for explosive dust environment

Abstract

The invention discloses an explosion-proof valve device for an explosive dust environment, and relates to the technical field of explosion-proof valves, the explosion-proof valve device comprises a valve body and a first protection assembly; a feeding ring is fixed to the right end of the interior of the valve body, a second protection assembly is installed at the left end of the interior of the valve body, two corresponding fixing assemblies are installed at the right ends of the front side and the rear side of the valve body, a pulling assembly is installed in the middle of the interior of the valve body, and a buffering assembly is installed at the left end of the feeding ring; a sealing assembly and a second connecting assembly are installed in the feeding ring, the sealing assembly and the buffering assembly are connected through the second connecting assembly, and a first connecting assembly is installed on the front side of the valve body. And the first protection assembly comprises a rotating shaft, a rotating disc, a valve cover, a pull rod and an inclined extrusion block, the valve cover is arranged at the left end of the fixing ring, the valve cover is attached to the left end of the feeding ring, shock waves generated by dust explosion can be buffered, the impact force of the shock waves is reduced, and leakage is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of explosion-proof valves, in particular to an explosion-proof valve device used in explosive dust environments. Background Art

[0002] Dust explosion refers to the situation where combustible dust encounters a heat source (open flame or high temperature) within the explosion limit, and the flame spreads instantly throughout the mixed dust space. The chemical reaction speed is extremely fast, and a large amount of heat is released at the same time, forming a very high temperature and a large pressure. The energy of the system is converted into mechanical energy and radiation of light and heat, which has a strong destructive power. Dust explosions often occur in production and processing sites accompanied by aluminum powder, zinc powder, aluminum processing grinding powder, various plastic powders, intermediates of organic synthetic drugs, wheat flour, sugar, sawdust, dyes, bakelite ash, milk powder, tea powder, tobacco powder, coal dust, plant fiber dust, etc.

[0003] Most of the existing protection measures for dust explosions are to use explosion-proof valves for protection. However, the existing explosion-proof valves have poor shock wave resistance during protection. They are easily damaged and leak due to the violent airflow generated by the explosion. Therefore, we propose a explosion-proof valve device for explosive dust environments. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a flameproof valve device for explosive dust environments, which can buffer the shock wave generated by the dust explosion, reduce its impact force, avoid leakage, and effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: an explosion-proof valve device for explosive dust environment, comprising a valve body and a first protection component;

[0006] Valve body: a feed ring is fixed at the right end inside, a second protective component is installed at the left end inside the valve body, two corresponding fixing components are installed at the right ends of the front and rear sides of the valve body, a pulling component is installed at the middle part of the valve body, a buffer component is installed at the left end of the feed ring, a sealing component and a second connecting component are installed inside the feed ring, the sealing component and the buffer component are connected through the second connecting component, and the first connecting component is installed on the front side of the valve body;

[0007] The first protective component: comprises a rotating shaft, a rotating disk, a valve cover, a pull rod and an oblique extrusion block, a valve cover is arranged at the left end of the fixed ring, the valve cover is fitted with the left end of the feed ring, a groove is opened at the upper end of the circumferential surface of the valve cover, a rotating shaft is fixed inside the groove, a rotating hole is opened at the right end of the front side of the valve body, the rotating shaft is rotatably connected inside the rotating hole, two corresponding rotating disks are fixed at the front and rear ends of the rotating shaft, a pull rod is fixed at the lower end of the circumferential surface of the rotating disk, an oblique extrusion ring is fixed at the lower end of the pull rod, a toggle assembly is installed on the circumferential surface of the pull rod, the toggle assembly is connected to the second protective component through the first connecting component, and the valve body is preliminarily sealed by setting the first protective component.

[0008] Furthermore, the fixing assembly comprises a fixing block, a sliding rod, an oblique fixing block, a metal disk, a first spring and an electromagnet, two corresponding fixing blocks are fixed to the right ends of the front and rear sides of the valve body, the fixing block is located below the pull rod, a sliding hole is opened in the middle of the fixing block, the sliding hole is slidably connected to the inside of the sliding hole, an oblique fixing block is fixed to the upper end of the sliding rod, the oblique fixing block is in contact with the oblique extrusion block, the oblique fixing block is located on the left side of the oblique extrusion block, a metal disk is fixed at the lower end of the sliding rod, a first spring is sleeved on the circumferential surface of the sliding rod, the lower end of the first spring is fixed to the upper end of the metal disk, the upper end of the first spring is fixed to the lower side of the fixing block, and two corresponding electromagnets are installed at the right ends of the front and rear sides of the valve body, the electromagnet is located below the metal disk, the input end of the electromagnet is electrically connected to the output end of the external control switch, and the two oblique extrusion blocks are limited by setting the fixing assembly, so that the valve cover can be fixed in this case.

[0009] Furthermore, the pulling assembly includes a connecting disk, a second spring and an oblique limit plate. The left end of the valve cover is fixed with a connecting disk, the left end of the connecting disk is fixed with a second spring, the left end of the second spring is fixed to the upper side of the valve body, and two corresponding oblique limit plates are fixed on the front and rear sides of the valve body. Both oblique limit plates correspond to the valve cover, and the valve cover is pulled to the left by setting the pulling assembly.

[0010] Furthermore, the second protective component includes a discharge ring, a connecting rod, a first gear and an isolation plate. The discharge ring is fixed at the left end inside the valve body. Two corresponding through holes are opened at the left end of the front side of the valve body. Two corresponding connecting rods are rotatably connected inside the two through holes. A first gear is fixed at the front end of the connecting rod. The two first gears are meshed with each other. An isolation plate is fixed to the upper end of the circumferential surface of the connecting rod. Both isolation plates are in contact with the right end of the discharge ring. The discharge ring is sealed by setting two isolation plates.

[0011] Furthermore, the first connecting component includes a first sprocket, a second gear, a second sprocket and a chain, the first sprocket is fixed to the front end of the upper first gear, the front side of the valve body is rotatably connected to the second gear, the front end of the second gear is fixed to the second sprocket, the second sprocket is connected to the first sprocket by a chain, and the toggle component and the two first gears are connected by setting the first connecting component.

[0012] Furthermore, the toggle assembly includes a limit block, an arc-shaped rack and a limit plate. Two corresponding limit blocks are fixed on the front and rear sides of the valve body. A guide hole is opened in the middle of the limit block. The inside of the guide hole is slidably connected with an arc-shaped rack. A limit plate is fixed on the upper side of the arc-shaped rack. The right side of the arc-shaped rack is fixed on the circumferential surface of the pull rod. The arc-shaped rack is meshed with the second gear. The second gear is driven to rotate by setting the toggle assembly.

[0013] Furthermore, the buffer assembly includes a damping disk, a support rod, a third spring and a support ring. The left end of the feed ring is provided with an annular groove, a support ring is arranged inside the annular groove, the right end of the annular groove is provided with evenly distributed sliding grooves, the inside of the sliding groove is slidably connected with a damping disk, a support rod is fixed to the left end of the damping disk, all the support rods are fixed to the right end of the support ring, a third spring is fixed to the right end of the damping disk, and the third spring is fixed inside the sliding groove. The impact force generated by the explosion is buffered by setting the buffer assembly.

[0014] Furthermore, the second connecting component includes a mounting groove, a third gear and a first rack. Two corresponding mounting grooves are opened inside the feed ring. The third gear is rotatably connected inside the mounting groove. An opening is opened on the left side inside the mounting groove. The first rack is slidably connected inside the opening. The two first racks are respectively fixed to the right ends of the upper and lower damping disks. The first rack is meshed with the third gear. The upper and lower damping disks are connected to the two second racks by setting the second connecting component.

[0015] Furthermore, the sealing assembly includes a second rack, a sealing ring and a sealing rubber ring. The sealing ring is slidably connected to the inside of the feed ring. The sealing ring is located in the gap between the valve cover and the feed ring. A sealing rubber ring is fixed on the circumferential surface of the sealing ring. The gap between the valve cover and the feed ring is sealed by setting the sealing assembly.

[0016] Furthermore, connecting flange rings are fixed on the circumferential surfaces of the feed ring and the discharge ring, and evenly distributed connecting holes are opened on the end surfaces of the connecting flange rings. The feed ring and the discharge ring are connected to the external pipeline by providing the connecting flange rings and the connecting holes.

[0017] Compared with the prior art, the invention has the following beneficial effects: the explosion-proof valve device for explosive dust environment has the following advantages:

[0018] 1. By setting the first protective component, if there is an impact force generated by a dust explosion during use, the valve cover will be squeezed to move and fit with the left end of the feed ring. After fitting, the explosion can be blocked to avoid leakage. During the fitting process, the valve cover will hit the support ring so that the support ring will hit all the damping disks to the right to move it to the right. In the process of moving to the right, the impact generated can be buffered, and after buffering, the valve cover can be prevented from being damaged;

[0019] 2. By setting the sealing assembly, when all the damping discs move to the right, the two first racks will be driven to move and shift the third gear. In this case, the two second racks can be moved to the left, driving the sealing ring and the sealing rubber ring to move to the left into the gap between the feed ring and the valve cover, thereby sealing the feed ring, which can further avoid leakage.

[0020] 3. By setting up the second protective component, when the valve cover is flipped, the two pull rods will be driven to fold downward, thereby pulling the two arc-shaped racks to move. When they move, the second gear will be driven to rotate, and the second gear will drive the first gear on the upper side to rotate. The rotation of the first gear on the upper side will drive the two connecting rods to rotate. The rotation of the two connecting rods will drive the two isolation plates to rotate and fit with the right end of the discharge ring. In this case, the discharge ring can be sealed, and leakage can be further prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the front structure of the present invention;

[0022] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 This is a schematic diagram of the structure of the pulling assembly of the present invention;

[0024] Figure 4 It is a front side sectional view of the present invention;

[0025] Figure 5 For the present invention Figure 4 The enlarged diagram of the structure at B in the middle;

[0026] Figure 6 This is a schematic diagram of the structure of the second protection component of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the first protection component of the present invention.

[0028] In the figure: 1 valve body, 2 feed ring, 3 first protection assembly, 31 rotating shaft, 32 rotating disk, 33 valve cover, 34 pull rod, 35 oblique extrusion block, 4 fixed assembly, 41 fixed block, 42 ​​slide rod, 43 oblique fixed block, 44 metal plate, 45 first spring, 46 electromagnet, 5 pulling assembly, 51 connecting plate, 52 second spring, 53 oblique limit plate, 6 second protection assembly, 61 discharge ring, 62 connecting rod, 63 first gear, 64 isolation plate, 7 first connecting assembly , 71 the first sprocket, 72 the second gear, 73 the second sprocket, 74 the chain, 8 the toggle assembly, 81 the limit block, 82 the arc rack, 83 the limit plate, 9 the buffer assembly, 91 the damping disk, 92 the support rod, 93 the third spring, 94 the support ring, 10 the second connecting assembly, 101 the mounting groove, 102 the third gear, 103 the first rack, 11 the sealing assembly, 111 the second rack, 112 the sealing ring, 113 the sealing rubber ring, 12 the connecting flange ring, 13 the connecting hole. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-7 , This embodiment provides a technical solution: an explosion-proof valve device for explosive dust environments, comprising a valve body 1 and a first protection component 3;

[0031] Valve body 1: A feed ring 2 is fixed to the right end inside, a second protective component 6 is installed to the left end inside the valve body 1, two corresponding fixing components 4 are installed to the right ends of the front and rear sides of the valve body 1, a pulling component 5 is installed in the middle part of the valve body 1, a buffer component 9 is installed to the left end of the feed ring 2, a sealing component 11 and a second connecting component 10 are installed inside the feed ring 2, the sealing component 11 and the buffer component 9 are connected through the second connecting component 10, a first connecting component 7 is installed on the front side of the valve body 1, the fixing component 4 includes a fixing block 41, a sliding rod 42, an oblique fixing block 43, a metal disk 44, a first spring 45 and an electromagnet 46, two corresponding fixing blocks 41 are fixed to the right ends of the front and rear sides of the valve body 1, and the fixing block 41 is located below the pull rod 34, fixed A sliding hole is provided in the middle of the fixed block 41, and a sliding rod 42 is slidably connected inside the sliding hole. An oblique fixed block 43 is fixed to the upper end of the sliding rod 42, and the oblique fixed block 43 fits with the oblique extrusion block 35. The oblique fixed block 43 is located on the left side of the oblique extrusion block 35. A metal disk 44 is fixed to the lower end of the sliding rod 42. A first spring 45 is sleeved on the circumferential surface of the sliding rod 42. The lower end of the first spring 45 is fixed to the upper end of the metal disk 44, and the upper end of the first spring 45 is fixed to the lower side of the fixed block 41. Two corresponding electromagnets 46 are installed at the right ends of the front and rear sides of the valve body 1. The electromagnet 46 is located below the metal disk 44. The input end of the electromagnet 46 is electrically connected to the output end of the external control switch. The pulling component 5 includes a connecting disk 51, a second spring 52 and an oblique The left end of the valve cover 33 is fixed with a connecting plate 51, and the left end of the connecting plate 51 is fixed with a second spring 52. The left end of the second spring 52 is fixed to the upper side of the valve body 1. Two corresponding oblique limiting plates 53 are fixed on the front and rear sides of the valve body 1. The two oblique limiting plates 53 correspond to the valve cover 33. The second protective component 6 includes a discharge ring 61, a connecting rod 62, a first gear 63 and a separation plate 64. The left end of the valve body 1 is fixed with a discharge ring 61. Two corresponding through holes are provided at the left end of the front side of the valve body 1. Two corresponding connecting rods 62 are rotatably connected inside the two through holes. The front end of the connecting rod 62 is fixed with a first gear 63. The two first gears 63 are meshed. The upper end of the circumferential surface of the connecting rod 62 is fixed with a separation plate 64. The two isolation plates 64 are both fitted with the right end of the discharge ring 61. The buffer assembly 9 includes a damping disc 91, a support rod 92, a third spring 93 and a support ring 94. An annular groove is provided at the left end of the feed ring 2, and a support ring 94 is arranged inside the annular groove. An evenly distributed slide groove is provided at the right end of the annular groove. The damping disc 91 is slidably connected inside the slide groove. A support rod 92 is fixed to the left end of the damping disc 91. All support rods 92 are fixed to the right end of the support ring 94. A third spring 93 is fixed to the right end of the damping disc 91. The third spring 93 is fixed inside the slide groove. The second connecting assembly 10 includes a mounting groove 101, a third gear 102 and a first rack 103. Two corresponding mounting grooves 101 are provided inside the feed ring 2.The third gear 102 is rotatably connected inside the mounting groove 101, an opening is provided on the left side inside the mounting groove 101, a first rack 103 is slidably connected inside the opening, two first racks 103 are respectively fixed to the right ends of the upper and lower damping disks 91, the first rack 103 is meshed with the third gear 102, the sealing assembly 11 comprises a second rack 111, a sealing ring 112 and a sealing rubber ring 113, the sealing ring 112 is slidably connected inside the feed ring 2, the sealing ring 112 is located in the gap between the valve cover 33 and the feed ring 2, A sealing rubber ring 113 is fixed on the circumferential surface, and the gap between the valve cover 33 and the feed ring 2 is sealed by setting the sealing component 11, and the upper and lower damping discs 91 are connected to the two second racks 111 by setting the second connecting component 10, and the impact force generated by the explosion is buffered by setting the buffer component 9, and the discharge ring 61 is sealed by setting two isolation plates 64, and the valve cover 33 is pulled to move to the left by setting the pulling component 5, and the two oblique extrusion blocks 35 are limited by setting the fixing component 4, so that the valve cover 33 can be fixed;

[0032] The first protection component 3: includes a rotating shaft 31, a rotating disk 32, a valve cover 33, a pull rod 34 and an oblique extrusion block 35. The left end of the fixed ring 2 is provided with a valve cover 33, and the valve cover 33 fits with the left end of the feed ring 2. A groove is provided at the upper end of the circumferential surface of the valve cover 33, and the rotating shaft 31 is fixed inside the groove. A rotating hole is provided at the right end of the front side of the valve body 1, and the rotating shaft 31 is rotatably connected inside the rotating hole. Two corresponding rotating disks 32 are fixed at the front and rear ends of the rotating shaft 31, and a pull rod 34 is fixed at the lower end of the circumferential surface of the rotating disk 32. An oblique extrusion ring 35 is fixed at the lower end of the pull rod 34. A toggle component 8 is installed on the circumferential surface of the pull rod 34, and the toggle component 8 is connected to the second protection component 6 through the first connecting component 7. The first connecting component 7 includes a first sprocket 71, a second gear 72, a second sprocket 73 and a chain 74. The front end of the first gear 63 on the upper side is fixed A first sprocket 71 is fixed, and the front side of the valve body 1 is rotatably connected to the second gear 72. The front end of the second gear 72 is fixed with a second sprocket 73. The second sprocket 73 is connected to the first sprocket 71 through a chain 74. The toggle assembly 8 includes a limit block 81, an arcuate rack 82 and a limit plate 83. Two corresponding limit blocks 81 are fixed on the front and rear sides of the valve body 1. A guide hole is opened in the middle of the limit block 81. The inside of the guide hole is slidably connected with an arcuate rack 82. The upper side of the arcuate rack 82 is fixed with a limit plate 83. The right side of the arcuate rack 82 is fixed on the circumferential surface of the pull rod 34. The arcuate rack 82 is meshed with the second gear 72. The second gear 72 is driven to rotate by setting the toggle assembly 8. The toggle assembly 8 and the two first gears 63 are connected by setting the first connecting assembly 7. The valve body 1 is preliminarily sealed by setting the first protective assembly 3.

[0033] Wherein: connecting flange rings 12 are fixed on the circumferential surfaces of the feed ring 2 and the discharge ring 61, and evenly distributed connecting holes 13 are opened on the end surface of the connecting flange ring 12. The feed ring 2 and the discharge ring 61 are connected to the external pipeline by setting the connecting flange ring 12 and the connecting holes 13.

[0034] The working principle of the explosion-proof valve device for explosive dust environment provided by the present invention is as follows: the feed ring 2 and the discharge ring 61 are respectively connected to the external feed pipe and the external discharge pipe through two connecting flange rings 12. After the connection, if the impact force generated by the dust explosion occurs, the extrusion valve cover 33 will be flipped downward to fit with the left end of the feed ring 2. After fitting, the explosion can be blocked. In the process of the valve cover 33 flipping downward, the two pull rods 34 will be driven to fold downward, so that the two oblique extrusion blocks 35 move downward to squeeze the two oblique fixed blocks 43. After the extrusion, the two oblique fixed blocks 43 move downward. When the two oblique extrusion blocks After the two inclined fixing blocks 43 are moved to the right side of the two oblique fixing blocks 43, the two oblique fixing blocks 43 will move upward under the action of the two first springs 45 and fit with the left side of the two oblique extrusion blocks 35. After fitting, the two oblique extrusion blocks 35 can be limited. After limiting, the valve cover 33 can be prevented from moving. In this case, the valve cover 33 can be firmly fitted with the left end of the feed ring 2, and leakage can be avoided after fitting. During the process of the two pull rods 34 being folded downward, the two arc-shaped racks 92 will also be pulled to move. When they move, the second gear 72 will be driven to rotate, and the second gear 72 will drive the upper first gear 63 to rotate, and the upper first gear 63 rotates The two connecting rods 62 are driven to rotate, and the rotation of the two connecting rods 62 drives the two isolation plates 64 to rotate and fit with the right end of the discharge ring 61. In this case, the discharge ring 61 can be sealed. In this case, further leakage can occur. The valve cover 33 will hit the support ring 94 during the downward flipping process, so that the support ring 94 hits all the damping discs 91 to the right to make them move to the right. In the process of its movement to the right, the impact generated can be buffered. After buffering, damage to the valve cover 33 can be avoided. In the process of all the damping discs 91 moving to the right, the two first racks 103 will also be driven to move and dial the third gear 102. In this case, The two second racks 111 move to the left, driving the sealing ring 112 and the sealing rubber ring 113 to move to the left into the gap between the feed ring 2 and the valve cover 33, thereby sealing the feed ring 2. In this case, leakage can be further avoided. When the valve body 1 needs to be opened, the two electromagnets 46 can be started by an external control switch to adsorb the two metal disks 44. After adsorption, the two metal disks 44 move downward, driving the two oblique fixing blocks 43 to move downward and separate from the two oblique extrusion blocks 35. After separation, the valve cover 33 will be flipped upward under the action of the second spring 52 and fit with the two oblique plates 53. After fitting, it is convenient for subsequent use.

[0035] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An explosion-proof valve device for explosive dust environment, characterized in that: It comprises a valve body (1) and a first protection component (3); Valve body (1): a feed ring (2) is fixed at the right end inside, a second protection component (6) is installed at the left end inside the valve body (1), two corresponding fixing components (4) are installed at the right ends of the front and rear sides of the valve body (1), a pulling component (5) is installed in the middle part of the valve body (1), a buffer component (9) is installed at the left end of the feed ring (2), a sealing component (11) and a second connecting component (10) are installed inside the feed ring (2), the sealing component (11) and the buffer component (9) are connected via the second connecting component (10), and a first connecting component (7) is installed on the front side of the valve body (1); The first protective component (3) comprises a rotating shaft (31), a rotating disk (32), a valve cover (33), a pull rod (34) and an oblique extrusion block (35). The left end of the fixed ring (2) is provided with a valve cover (33), and the valve cover (33) fits with the left end of the feed ring (2). The upper end of the circumferential surface of the valve cover (33) is provided with a groove, and the interior of the groove is fixed with a rotating shaft (31). The right end of the front side of the valve body (1) is provided with a rotating hole, and the rotating shaft (31) is rotatably connected to the interior of the rotating hole. Two corresponding rotating disks (32) are fixed at the front and rear ends of the rotating shaft (31), and the lower end of the circumferential surface of the rotating disk (32) is fixed with a pull rod (34), and the lower end of the pull rod (34) is fixed with an oblique extrusion ring (35). A toggle component (8) is installed on the circumferential surface of the pull rod (34), and the toggle component (8) is connected to the second protective component (6) through the first connecting component (7).

2. The flameproof valve device for explosive dust environment according to claim 1, characterized in that: The fixing assembly (4) comprises a fixing block (41), a sliding rod (42), an oblique fixing block (43), a metal plate (44), a first spring (45) and an electromagnet (46). Two corresponding fixing blocks (41) are fixed to the right ends of the front and rear sides of the valve body (1). The fixing blocks (41) are located below the pull rod (34). A sliding hole is provided in the middle of the fixing block (41). The sliding hole is slidably connected to the inside of the sliding hole. An oblique fixing block (43) is fixed to the upper end of the sliding rod (42). The oblique fixing block (43) is fitted with the oblique extrusion block (35). The fixed block (43) is located on the left side of the oblique extrusion block (35), a metal disk (44) is fixed at the lower end of the slide rod (42), a first spring (45) is sleeved on the circumferential surface of the slide rod (42), the lower end of the first spring (45) is fixed to the upper end of the metal disk (44), and the upper end of the first spring (45) is fixed to the lower side of the fixed block (41), and two corresponding electromagnets (46) are installed at the right ends of the front and rear sides of the valve body (1), the electromagnets (46) are located below the metal disk (44), and the input end of the electromagnet (46) is electrically connected to the output end of the external control switch.

3. The explosion-proof valve device for explosive dust environment according to claim 1, characterized in that: The pulling assembly (5) comprises a connecting disk (51), a second spring (52) and an oblique limiting plate (53); the connecting disk (51) is fixed to the left end of the valve cover (33); the second spring (52) is fixed to the left end of the connecting disk (51); the left end of the second spring (52) is fixed to the upper side of the inside of the valve body (1); two corresponding oblique limiting plates (53) are fixed to the front and rear sides of the inside of the valve body (1); and the two oblique limiting plates (53) correspond to the valve cover (33).

4. The flameproof valve device for explosive dust environment according to claim 1, characterized in that: The second protective component (6) comprises a discharge ring (61), a connecting rod (62), a first gear (63) and an isolation plate (64); the discharge ring (61) is fixed to the left end inside the valve body (1); two corresponding through holes are provided at the left end of the front side of the valve body (1); two corresponding connecting rods (62) are rotatably connected inside the two through holes; the first gear (63) is fixed to the front end of the connecting rod (62); the two first gears (63) are meshed with each other; the isolation plate (64) is fixed to the upper end of the circumferential surface of the connecting rod (62); the two isolation plates (64) are both in contact with the right end of the discharge ring (61).

5. The flameproof valve device for explosive dust environment according to claim 4, characterized in that: The first connecting component (7) comprises a first sprocket (71), a second gear (72), a second sprocket (73) and a chain (74); the first sprocket (71) is fixed to the front end of the first gear (63) on the upper side; the front side of the valve body (1) is rotatably connected to the second gear (72); the front end of the second gear (72) is fixed to the second sprocket (73); and the second sprocket (73) is connected to the first sprocket (71) via a chain (74).

6. The flameproof valve device for explosive dust environment according to claim 5, characterized in that: The toggle assembly (8) comprises a limit block (81), an arc-shaped rack (82) and a limit plate (83); two corresponding limit blocks (81) are fixed on the front and rear sides of the valve body (1); a guide hole is opened in the middle of the limit block (81); an arc-shaped rack (82) is slidably connected inside the guide hole; a limit plate (83) is fixed on the upper side of the arc-shaped rack (82); the right side of the arc-shaped rack (82) is fixed on the circumferential surface of the pull rod (34); and the arc-shaped rack (82) is meshed with the second gear (72).

7. The explosion-proof valve device for explosive dust environment according to claim 1, characterized in that: The buffer assembly (9) comprises a damping disc (91), a support rod (92), a third spring (93) and a support ring (94); an annular groove is provided at the left end of the feed ring (2); a support ring (94) is arranged inside the annular groove; a uniformly distributed slide groove is provided at the right end inside the annular groove; a damping disc (91) is slidably connected inside the slide groove; a support rod (92) is fixed at the left end of the damping disc (91); all the support rods (92) are fixed at the right end of the support ring (94); a third spring (93) is fixed at the right end of the damping disc (91); and the third spring (93) is fixed inside the slide groove.

8. The flameproof valve device for explosive dust environment according to claim 7, characterized in that: The second connecting component (10) comprises a mounting groove (101), a third gear (102) and a first rack (103); two corresponding mounting grooves (101) are provided inside the feed ring (2); the third gear (102) is rotatably connected inside the mounting groove (101); an opening is provided on the left side inside the mounting groove (101); the first rack (103) is slidably connected inside the opening; the two first racks (103) are respectively fixed to the right ends of the upper and lower damping plates (91); the first rack (103) is meshed with the third gear (102).

9. The flameproof valve device for explosive dust environment according to claim 8, characterized in that: The sealing assembly (11) comprises a second rack (111), a sealing ring (112) and a sealing rubber ring (113); the sealing ring (112) is slidably connected to the inside of the feed ring (2); the sealing ring (112) is located in the gap between the valve cover (33) and the feed ring (2); and the sealing rubber ring (113) is fixed on the circumferential surface of the sealing ring (112).

10. The explosion-proof valve device for explosive dust environment according to claim 4, characterized in that: A connecting flange ring (12) is fixed on the circumferential surface of the feed ring (2) and the discharge ring (61), and evenly distributed connecting holes (13) are provided on the end surface of the connecting flange ring (12).

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