Explosion venting device for bag-type dust collector

Abstract

The explosion venting device comprises a flange, a shell and an explosion venting piece, the left side wall of the flange is fixedly connected with the right side wall of the shell, the explosion venting piece is installed at the top of an inner cavity of the shell in a swinging mode through a pin shaft, and the explosion venting device further comprises a limiting mechanism, an arc extinguishing mechanism, a dust falling mechanism and an adjusting mechanism; the limiting mechanism is fixedly connected to the right end of the lower surface of the shell. The arc extinguishing mechanism is fixedly connected to the left end of the shell; the dust falling mechanism is fixedly connected to the upper surface of the shell; the adjusting mechanism is installed on the front face of the arc extinguishing mechanism, the limiting mechanism comprises a box body, a sliding rod, a first spring, a stop lever, a pull ring, a stop block, a first contact and a clamping assembly, and the box body is fixedly connected to the right end of the lower surface of the shell; the sliding rod can be inserted into the right end of the lower surface of the box body in an up-down sliding mode. The dust remover has a flue gas purification function, air pollution is prevented, the flue gas emission direction is changed, flue gas pollution or damage to equipment or personnel adjacent to the dust remover is prevented, and the use safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of dust removal safety, and in particular to an explosion relief device for a bag dust collector. Background Art

[0002] The bag filter is a dry dust filtering device. It is suitable for capturing fine, dry, non-fibrous dust. The filter bag is made of textile filter cloth or non-textile felt, and uses the filtering effect of the fiber fabric to filter the dust-containing gas. When the dust-containing gas enters the bag filter, the dust with large particles and high specific gravity settles down due to the effect of gravity and falls into the ash hopper. When the gas containing finer dust passes through the filter material, the dust is retained, so that the gas is purified. In order to prevent the dust, foreign matter and other materials accumulated inside the dust collector from being ignited and detonated, causing casualties and equipment damage, a safety explosion relief valve must be installed on the dust collector. When an explosion or fire occurs, the pressure generated by the expansion of the smoke will cause the explosion relief plate to open, and the steel mesh will disperse the fire, allowing the smoke to spray out after the arc is extinguished, releasing the internal pressure of the dust collector; Although the explosion relief valve can relieve pressure to protect the dust collector and personnel, the discharged flue gas will not be purified and will pollute the air. Moreover, the direction of flue gas discharge cannot be changed, making it difficult for the flue gas to move in a safe direction, which can easily damage other equipment near the dust collector or cause injury to personnel. Therefore, it is necessary to propose a dust collector explosion relief device that is safe to use. Summary of the invention

[0003] The object of the present invention is to provide an explosion relief device for a bag filter, so as to at least solve the problem that the prior art cannot reduce dust on the smoke from the explosion relief and cannot change the emission direction.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an explosion-relief device for a bag dust collector, comprising a flange, a shell and an explosion-relief plate, wherein the left side wall of the flange is fixedly connected to the right side wall of the shell, and the explosion-relief plate is swingably installed on the top of the inner cavity of the shell through a pin shaft, and also comprises a limiting mechanism, an arc extinguishing mechanism, a dust reduction mechanism and an adjusting mechanism, wherein the limiting mechanism is fixedly connected to the right end of the lower surface of the shell; the arc extinguishing mechanism is fixedly connected to the left end of the shell; the dust reduction mechanism is fixedly connected to the upper surface of the shell; and the adjusting mechanism is installed on the front of the arc extinguishing mechanism.

[0005] Preferably, the purpose is to be triggered during explosion relief, causing the nozzle to spray water mist to achieve dust reduction, and the limiting mechanism includes a box body, a sliding rod, a first spring, a blocking rod, a pull ring, a block, a first contact and a locking assembly, the box body is fixedly connected to the right end of the lower surface of the shell; the sliding rod can be slid up and down and inserted into the right end of the lower surface of the box body; the first spring is sleeved on the outer wall of the sliding rod; the blocking rod and the pull ring are respectively installed at the upper and lower ends of the sliding rod, and the blocking rod is pushed up under the elastic force of the first spring, and the explosion relief piece is blocked and limited by the blocking rod; the block is installed on the top of the left side wall of the blocking rod, and the rising distance of the blocking rod is limited by the block, and the block is in the shape of a triangle; the first contact is embedded in the upper surface of the block, and the first contact is externally connected to a power supply; the locking assembly is horizontally installed on the top of the left inner wall of the box body.

[0006] Preferably, the top shape of the baffle bar is triangular.

[0007] Preferably, the locking assembly includes a first guide rod, a guide sleeve, a second spring, a second contact, a second guide rod, an extrusion block and a limit block, the first guide rod is horizontally installed on the top of the left inner wall of the box body; the guide sleeve is slidably sleeved on the outer wall of the first guide rod; the second spring is inserted into the inner cavity of the guide sleeve, and pushes the guide sleeve to move right under the action of the elastic force of the second spring; the second contact is embedded in the right end of the lower surface of the guide sleeve; the second guide rod is vertically installed on the right side of the lower surface of the guide sleeve, and the second guide rod is located at the left end of the second contact, and the outer wall of the second guide rod is rectangular in shape; the extrusion block is slidably sleeved on the outer wall of the second guide rod, and the extrusion block will not rotate due to the shape of the second guide rod; the limit block is installed at the bottom end of the second guide rod.

[0008] Preferably, the guide sleeve and the right end of the extrusion block are both triangular in shape and symmetrical in vertical direction.

[0009] Preferably, the arc extinguishing mechanism includes a frame, an arc extinguishing mesh, a rotating shaft, a louver, a sprocket and a chain, the frame is fixedly connected to the left side wall of the outer shell; the arc extinguishing mesh is vertically installed on the right side of the inner cavity of the frame, and the flames generated by the explosion are dispersed by the arc extinguishing mesh to achieve an arc extinguishing effect; there are several rotating shafts, which are installed on the left side of the inner cavity of the frame from top to bottom through bearings; the louver is installed on the outer wall of the rotating shaft, and the swing of the louver can change the direction of smoke emission; the sprocket is installed on the front end of the rotating shaft; the chain is connected to the outer wall of the sprocket.

[0010] Preferably, the dust reduction mechanism includes a bracket, a nozzle and a solenoid valve, the bracket is installed on the upper surface of the shell; the nozzle is installed on the top of the bracket, and the water spraying direction of the nozzle is vertically downward; the solenoid valve is installed at the water inlet of the nozzle, and the solenoid valve is electrically connected to the second contact, and the solenoid valve is externally connected to a water tank.

[0011] Preferably, the purpose is to change the angle of the louver, and then change the direction of smoke emission to achieve the purpose of safe emission. The adjustment mechanism includes a dust cover, a box body, a gear, a limit rod, a screw, a slide seat, a rack, a knob, a brake disc, a positioning blind hole, a sleeve and a plug rod. The dust cover is vertically installed on the front side of the frame to prevent dust from the sprocket and chain transmission; the box body is horizontally installed at the bottom of the dust cover; the gear is installed at the front end of the rotating shaft at the bottom; the limit rod is horizontally installed at the bottom of the box body cavity; the screw is horizontally installed at the top of the box body cavity through a bearing; the slide seat It is threaded on the outer wall of the screw, and the slide is sleeved on the outer wall of the limit rod. When the screw rotates clockwise or counterclockwise, the rotational force of the screw thread can drive the slide to move to the left or right; the rack is horizontally installed on the upper surface of the slide, and the rack is meshingly connected with the gear; the knob and the brake disc are respectively installed on the left and right ends of the screw, and the side wall of the brake disc is provided with a plurality of positioning blind holes along the circumferential direction; the sleeve is vertically installed on the top of the right side wall of the box body; the insertion rod can be slid up and down and inserted into the inner cavity of the sleeve, and the insertion rod is inserted into the inner cavity of the positioning blind hole under the action of its own gravity to brake the brake disc.

[0012] Preferably, a plurality of the positioning blind holes are equidistantly distributed on the side wall of the brake disc along the circumferential direction, and the number of the positioning blind holes is at least eighteen.

[0013] The explosion relief device for bag dust collector proposed by the present invention has the following beneficial effects: 1. The impact force brought by the explosion-proof plate of the present invention can move the baffle rod downward, allowing the block to reach the bottom of the guide sleeve. Under the elastic force of the first spring, the baffle rod drives the block to move upward, and the block contacts the guide sleeve. The first contact and the second contact form a closed loop, the solenoid valve opens, and the nozzle sprays water mist downward to reduce dust on the smoke generated by the explosion. Therefore, it has the function of purifying smoke and preventing air pollution.

[0014] 2. The present invention rotates the screw clockwise or counterclockwise, allowing the screw thread rotation force to drive the slide to move to the left or right. Under the transmission of the rack and gear, the rotating shaft can rotate clockwise or counterclockwise. Under the transmission of the sprocket and chain, all the louvers rotate synchronously to change the direction of smoke emission, prevent smoke pollution or damage to equipment or personnel adjacent to the dust collector, and improve safety in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a front cross-sectional view of the present invention; Figure 3 It is a front cross-sectional view of the limiting mechanism of the present invention; Figure 4 This is a schematic diagram of the structure of the clamping assembly of the present invention; Figure 5 It is a front cross-sectional view of the adjustment mechanism of the present invention; Figure 6 This is an enlarged view of point A of the present invention.

[0016] In the figure: 1, flange; 2, housing; 3, explosion relief plate; 4, limit mechanism; 5, arc extinguishing mechanism; 6, dust suppression mechanism; 7, adjustment mechanism; 41, box; 42, slide bar; 43, first spring; 44, stop bar; 45, pull ring; 46, stop block; 47, first contact; 48, clamping assembly; 481, first guide rod; 482, guide sleeve; 483, second spring; 484, second contact; 485, second guide rod; 486, Extrusion block; 487, limit block; 51, frame; 52, arc extinguishing mesh plate; 53, rotating shaft; 54, shutter; 55, sprocket; 56, chain; 61, bracket; 62, nozzle; 63, solenoid valve; 71, dust cover; 72, box body; 73, gear; 74, limit rod; 75, screw; 76, slide seat; 77, rack; 78, knob; 79, brake disc; 710, positioning blind hole; 711, sleeve; 712, plug rod. DETAILED DESCRIPTION

[0017] 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.

[0018] See also Figure 1-6 The present invention provides a technical solution: an explosion relief device for a bag dust collector, wherein a flange 1 is locked at the explosion relief port of the dust collector by screws, comprising a flange 1, a shell 2 and an explosion relief piece 3, wherein the left side wall of the flange 1 is fixedly connected to the right side wall of the shell 2, the explosion relief piece 3 is swingably installed at the top right side of the inner cavity of the shell 2 through a pin shaft, a limiting mechanism 4 is fixedly connected to the right end of the lower surface of the shell 2, and the explosion relief piece 3 is limited to swing left by the limiting mechanism 4, an arc extinguishing mechanism 5 is fixedly connected to the left side wall of the shell 2, and the arc extinguishing mechanism 5 prevents flames from spraying out during explosion, a dust reduction mechanism 6 is fixedly connected to the top of the shell 2, and dust is reduced on smoke generated during explosion by spraying water mist, and an adjustment mechanism 7 is installed on the front of the arc extinguishing mechanism 5; The limiting mechanism 4 includes a box body 41 fixedly connected to the right end of the lower surface of the shell 2, a sliding rod 42 that can slide up and down is inserted at the right end of the lower surface of the box body 41, a first spring 43 is sleeved on the outer wall of the sliding rod 42, and a blocking rod 44 and a pull ring 45 are respectively installed at the upper and lower ends of the sliding rod 42. Under the elastic force of the first spring 43, the blocking rod 44 is pushed to move upward, so that the blocking rod 44 blocks the explosion-proof plate 3 from swinging left. The top of the blocking rod 44 is triangular. When the explosion-proof plate 3 is pushed by a strong external force, the explosion-proof plate 3 squeezes the inclined surface of the blocking rod 44, prompting the blocking rod 44 to move downward, thereby releasing the restriction on the explosion-proof plate 3. A block 46 for limiting the rising distance of the blocking rod 44 is installed on the top of the left side wall of the blocking rod 44. The block 46 is triangular in shape, and a first contact 47 is embedded in the upper surface of the block 46, and the first contact 47 is externally connected to a power supply. A clamping assembly 48 is horizontally installed on the top of the left inner wall of the box body 41.

[0019] As a preferred solution, further, the clamping assembly 48 includes a first guide rod 481 installed horizontally on the top of the left inner wall of the box body 41, the outer wall of the first guide rod 481 is rectangular, the outer wall of the first guide rod 481 is sleeved with a guide sleeve 482 that can slide left and right, and the guide sleeve 482 will not rotate due to the shape of the first guide rod 481. A second spring 483 is inserted into the inner cavity of the guide sleeve 482, and the guide sleeve 482 is pushed to move right under the elastic force of the second spring 483. A second contact 484 is embedded in the right end of the lower surface of the guide sleeve 482, and a second guide rod 485 is vertically installed on the lower surface of the guide sleeve 482, and the second guide rod 485 is located at the left end of the second contact 484. The outer wall of the second guide rod 485 is sleeved with an extrusion block 486 that can slide up and down, and the outer wall of the second guide rod 485 is rectangular to prevent the extrusion block 486 from rotating during movement. A limiting block 487 is installed at the bottom end of the second guide rod 485. 487 prevents the extrusion block 486 from separating from the second guide rod 485. The extrusion block 486 and the right side of the guide sleeve 482 are both triangular and symmetrical. When the explosion-proof plate 3 squeezes the baffle rod 44 to descend, the baffle block 46 squeezes the guide sleeve 482 to the left, and the baffle block 46 moves to between the guide sleeve 482 and the extrusion block 486. Then the first spring 43 pushes the baffle rod 44 to rise, and the first contact 47 contacts the second contact 484 to form a closed loop. If it is necessary to reset the baffle rod 44, pull the pull ring 45 down to prompt the baffle block 46 to squeeze the guide sleeve 482 first, and then squeeze the extrusion block 486, so that the baffle block 46 moves to the bottom of the extrusion block 486. Then the elastic force of the first spring 43 pushes the baffle block 46 to rise, and the extrusion block 486 follows the baffle block 46 to rise until the extrusion block 486 contacts the guide sleeve 482. At this time, the guide sleeve 482 is squeezed by the baffle block 46 to move to the left, and the baffle block 46 moves to the top of the guide sleeve 482, and the baffle rod 44 is reset.

[0020] As a preferred embodiment, the arc extinguishing mechanism 5 further includes a frame 51 fixedly connected to the left side wall of the outer shell 2, and an arc extinguishing mesh plate 52 is vertically installed on the right side of the inner cavity of the frame 51. The mesh holes of the arc extinguishing mesh plate 52 disperse the flames generated by the explosion, thereby achieving arc extinguishing and preventing open flames from being sprayed out. A number of rotating shafts 53 are installed from top to bottom through bearings on the left side of the inner cavity of the frame 51, and louvers 54 are installed on the outer wall of the rotating shaft 53. The smoke emission direction is changed by swinging the louvers 54. A sprocket 55 is installed at the front end of the rotating shaft 53, and the outer wall of the sprocket 55 is chain-connected with a chain 56. The chain 56 and the sprocket 55 are driven to allow all the louvers 54 to rotate in the same direction.

[0021] As a preferred solution, further, a bracket 61 is fixedly connected to the upper surface of the shell 2, a nozzle 62 is installed on the top of the bracket 61, the nozzle 62 sprays downward, and purifies the flue gas by spraying water mist, and a solenoid valve 63 electrically connected to the second contact 484 is installed at the water inlet of the nozzle 62, and the solenoid valve 63 is externally connected to a water tank to provide water to the nozzle 62.

[0022] As a preferred solution, further, the adjustment mechanism 7 includes a dust cover 71 vertically installed on the left side of the front face of the frame 51, through which the sprocket 55 and the chain 56 are dustproof, a box body 72 is horizontally installed at the bottom of the dust cover 71, a gear 73 is installed at the front end of the rotating shaft 53 at the bottom, a limit rod 74 is horizontally installed at the bottom of the inner cavity of the box body 72, a screw rod 75 is horizontally installed at the top of the inner cavity of the box body 72 through a bearing, a slide seat 76 is screwed on the outer wall of the screw 75, and the slide seat 76 is sleeved on the outer wall of the limit rod 74, when the screw 75 rotates clockwise or counterclockwise, the threaded rotation force of the screw 75 drives the slide seat 76 to the left or right Moving to the right, a rack 77 meshing with the gear 73 is horizontally installed on the upper surface of the slide 76, and a knob 78 and a brake disc 79 are respectively installed at the left and right ends of the screw 75. A number of positioning blind holes 710 are equidistantly provided on the side wall of the brake disc 79 along the circumferential direction. A sleeve 711 is vertically installed on the top of the right side wall of the box body 72. A plug rod 712 that can slide up and down is inserted into the inner cavity of the sleeve 711. The plug rod 712 is inserted into the positioning blind hole 710 under its own gravity to brake the brake disc 79. There are at least eighteen positioning blind holes 710, and braking can be performed within twenty degrees of rotation of the screw 75, which is convenient for fine-tuning the direction of the shutter 54.

[0023] The detailed connection means are well-known in the art. The following mainly introduces the working principle and process. The specific work is as follows.

[0024] Step 1: When the dust collector explodes, the impact force generated by the explosion pushes the explosion relief plate 3 to swing leftward, and the explosion relief plate squeezes the inclined surface of the blocking rod 44, causing the blocking rod 44 to move downward. The explosion relief plate 3 opens the housing 2, and when the flame passes through the arc extinguishing mesh plate 52, the mesh holes of the arc extinguishing mesh plate 52 disperse the flame to extinguish the arc, and then the smoke is ejected from the gaps of the louver 54 to achieve explosion relief; Step 2: When the blocking rod 44 extends into the box body 41, the blocking block 46 moves downward, and the inclined surface of the blocking block 46 and the inclined surface of the guide sleeve 482 squeeze each other, causing the guide sleeve 482 to slide leftward along the outer wall of the first guide rod 481. The blocking block 46 moves to between the guide sleeve 482 and the squeezing block 486. At this time, the blocking rod 44 is no longer affected by the explosion-proof plate 3. The first spring 43 pushes the blocking rod 44 upward under its own elastic force. The first contact 47 contacts the second contact 484 to form a closed loop, and the solenoid valve 63 opens, allowing the nozzle 62 to spray water mist downward to purify the flue gas. Step 3: When the stopper 44 needs to be reset, the pull ring 45 is pulled down to cause the stopper 46 to first squeeze the guide sleeve 482 and then squeeze the squeezing block 486, so that the stopper 46 moves to the bottom of the squeezing block 486, and then the elastic force of the first spring 43 pushes the stopper 46 to rise, and the squeezing block 486 rises with the stopper 46 until the squeezing block 486 contacts the guide sleeve 482, and the stopper 46 squeezes the inclined surface of the squeezing block 486, so that the squeezing block 486 and the guide sleeve 482 move to the left, and the stopper 46 moves to the top of the guide sleeve 482, and the stopper 44 is separated from the guide sleeve 482 and reset; Step four, when it is necessary to change the direction of smoke emission, pull out the rod 712 from the positioning blind hole 710, release the restriction on the brake disc 79, and allow the screw 75 to rotate clockwise or counterclockwise. Under the condition that the limit rod 74 limits the slide 76, the threaded rotation force of the screw 75 drives the slide 76 to the left or right, thereby moving the rack 77 left and right. Under the transmission of the rack 77 and the gear 73, the sprocket 55 rotates clockwise or counterclockwise, and the louver 54 rotates clockwise or counterclockwise until the inclination direction of the louver 54 meets the requirement for the smoke emission direction, insert the rod 712 into the corresponding position positioning blind hole 710, brake the screw 75, and realize the change of the smoke emission direction.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An explosion relief device for a bag dust collector, comprising a flange (1), a shell (2) and an explosion relief plate (3), wherein the left side wall of the flange (1) is fixedly connected to the right side wall of the shell (2), and the explosion relief plate (3) is swingably mounted on the top of the inner cavity of the shell (2) via a pin shaft, characterized in that: Also includes: A limiting mechanism (4) fixedly connected to the right end of the lower surface of the housing (2); An arc extinguishing mechanism (5) fixedly connected to the left end of the housing (2); A dust reduction mechanism (6) fixedly connected to the upper surface of the housing (2); An adjusting mechanism (7) mounted on the front side of the arc extinguishing mechanism (5); The limiting mechanism (4) comprises: A box body (41) fixedly connected to the right end of the lower surface of the shell (2); A slide rod (42) is inserted into the right end of the lower surface of the box body (41) so as to be able to slide up and down; A first spring (43) sleeved on the outer wall of the sliding rod (42); The blocking rod (44) and the pull ring (45) are respectively mounted on the upper and lower ends of the slide rod (42), and the blocking rod (44) is pushed upward under the elastic force of the first spring (43), so that the explosion relief plate (3) is blocked and limited by the blocking rod (44); A stopper (46) is mounted on the top of the left side wall of the stopper rod (44), and the stopper rod (46) is used to limit the rising distance of the stopper rod (44). The stopper block (46) is in the shape of a triangle; A first contact (47) is embedded in the upper surface of the stopper (46), and the first contact (47) is externally connected to a power source; The clamping assembly (48) is installed transversely on the top of the left inner wall of the box body (41).

2. The explosion relief device for bag filter according to claim 1, characterized in that: The top of the blocking rod (44) is in the shape of a triangle.

3. The explosion relief device for bag filter according to claim 1, characterized in that: The locking assembly (48) comprises: A first guide rod (481) is transversely mounted on the top of the left inner wall of the box body (41); A guide sleeve (482) is sleeved on the outer wall of the first guide rod (481) so as to be slidable left and right; A second spring (483) is inserted into the inner cavity of the guide sleeve (482) and pushes the guide sleeve (482) to move rightward under the elastic force of the second spring (483); A second contact (484) embedded in the right end of the lower surface of the guide sleeve (482); A second guide rod (485) is vertically mounted on the right side of the lower surface of the guide sleeve (482), and the second guide rod (485) is located at the left end of the second contact point (484), and the outer wall of the second guide rod (485) is rectangular in shape; An extrusion block (486) is slidably sleeved on the outer wall of the second guide rod (485) and is restricted by the shape of the second guide rod (485) so that the extrusion block (486) will not rotate; The limiting block (487) is installed at the bottom end of the second guide rod (485).

4. The explosion relief device for bag filter according to claim 3, characterized in that: The guide sleeve (482) and the right end of the extrusion block (486) are both triangular in shape and symmetrical in top and bottom.

5. The explosion relief device for bag filter according to claim 1, characterized in that: The arc extinguishing mechanism (5) comprises: A frame (51) fixedly connected to the left side wall of the housing (2); An arc extinguishing mesh plate (52) is vertically mounted on the right side of the inner cavity of the frame (51), and the flame generated by the explosion is dispersed by the arc extinguishing mesh plate (52), thereby achieving an arc extinguishing effect; A plurality of rotating shafts (53) are installed from top to bottom on the left side of the inner cavity of the frame (51) via bearings; A louver (54) is mounted on the outer wall of the rotating shaft (53), and the louver (54) can change the direction of smoke emission by swinging; A sprocket (55) mounted on the front end of the rotating shaft (53); A chain (56) is connected to the outer wall of the sprocket (55).

6. The explosion relief device for bag filter according to claim 1, characterized in that: The dust reduction mechanism (6) comprises: A bracket (61) mounted on the upper surface of the housing (2); A spray pipe (62) is mounted on the top of the bracket (61), and the spray pipe (62) sprays water vertically downward; The solenoid valve (63) is installed at the water inlet of the spray pipe (62), and the solenoid valve (63) is electrically connected to the second contact point (484). The solenoid valve (63) is externally connected to a water tank.

7. The explosion relief device for bag filter according to claim 5, characterized in that: The regulating mechanism (7) comprises: A dust cover (71) is vertically mounted on the front of the frame (51) to prevent dust from penetrating the sprocket (55) and the chain (56); A box body (72) is transversely mounted on the bottom end of the dust cover (71); A gear (73) mounted on the front end of the rotating shaft (53) at the bottom; A limiting rod (74) is transversely mounted on the bottom of the inner cavity of the box body (72); A screw (75) is transversely mounted on the top of the inner cavity of the box body (72) via a bearing; A slide seat (76) is screwed onto the outer wall of the screw rod (75), and the slide seat (76) is sleeved onto the outer wall of the limit rod (74). When the screw rod (75) rotates clockwise or counterclockwise, the thread rotation force of the screw rod (75) can drive the slide seat (76) to move leftward or rightward. A rack (77) is transversely mounted on the upper surface of the slide seat (76), and the rack (77) is meshingly connected with the gear (73); The knob (78) and the brake disc (79) are respectively mounted on the left and right ends of the screw rod (75); a plurality of blind positioning holes (710) are formed on the side wall of the brake disc (79) along the circumferential direction; A sleeve (711) is vertically mounted on the top of the right side wall of the box body (72); The insertion rod (712) is inserted into the inner cavity of the sleeve (711) so as to slide up and down. The insertion rod (712) is inserted into the inner cavity of the positioning blind hole (710) under the action of its own gravity to brake the brake disc (79).

8. The explosion relief device for bag filter according to claim 7, characterized in that: A plurality of the positioning blind holes (710) are equidistantly distributed on the side wall of the brake disc (79) along the circumferential direction, and the number of the positioning blind holes (710) is at least eighteen.

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