Negative pressure balancing device and dust removal system

Abstract

The present invention relates to the technical field of dust removal equipment, and discloses a negative pressure balancing device and a dust removal system, including: a lower valve body and an upper valve body, and the lower valve body is welded and fixed on the surface of a dust removal pipe; a pressure relief assembly, the pressure relief assembly includes a top plate fixed on the top of the upper valve body by mounting bolts, and the upper surface of the top plate is provided with four pressure relief holes in a rectangular array, the inner walls of the four pressure relief holes are fixed with pressure relief sleeves, and the inner wall of the pressure relief sleeve is slidably provided with a sliding sleeve, and the pressure relief assembly also includes an inner angle steel welded and fixed to the inner wall of the upper valve body, and the upper surface of the inner angle steel is welded and fixed with a pull rod passing through the inner angle steel in a rectangular array. Through the pressure relief assembly, when the coke oven flue gas is drained through the dust removal pipe, compared with the existing method of adding a gravity balance valve between the dust removal pipe and the fan, the negative pressure balancing device proposed by the present invention is more stable and has good sealing performance through the setting of four springs when in use.

Description

Technical Field

[0001] The present invention relates to the technical field of dust removal equipment, and more specifically, to a negative pressure balancing device and a dust removal system. Background Art

[0002] A coke oven is a furnace used to refine coke. Currently, the coke ovens on the market are basically composed of a carbonization chamber, a combustion chamber, a heat storage chamber, an inclined area, a furnace top, a foundation, a flue, etc.

[0003] During the actual operation of the coke oven, an environmental dust removal system is usually required to handle the smoke generated inside the coke oven. The fan in the existing environmental dust removal system is connected to the coke oven through a pipeline to suck away the smoke in the coke oven. During this process, if a valve on the pipeline fails, the pressure in the pipeline will increase. If it is not handled in time, the pipeline will be sucked flat. The commonly used solution is to add a gravity balance valve between the pipeline and the fan. Since the gravity hammer in the gravity balance valve is only set on both sides of the valve body, the structure is not very stable and the sealing is not good.

[0004] To this end, the present invention provides a negative pressure balancing device and a dust removal system. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The present invention provides a negative pressure balancing device, comprising:

[0007] A lower valve body and an upper valve body, wherein the lower valve body is welded and fixed on the surface of the dust removal duct, and the upper valve body and the lower valve body are fixedly connected by bolts;

[0008] A pressure relief assembly, the pressure relief assembly includes a top plate fixed to the top of the upper valve body by mounting bolts, and the upper surface of the top plate is provided with four pressure relief holes in a rectangular array, the inner walls of the four pressure relief holes are fixed with pressure relief sleeves, the inner wall of the pressure relief sleeve is slidably provided with a sliding sleeve, the pressure relief assembly also includes an inner angle steel welded and fixed to the inner wall of the upper valve body, the upper surface of the inner angle steel is welded and fixed with a pull rod penetrating the inner angle steel in a rectangular array, the top ends of the four pull rods respectively penetrate four sliding sleeves and extend to the top end of the sliding sleeve, and the inner wall of the sliding sleeve is slidably connected to the outer surface of the pull rod, the outer surface of the sliding sleeve is fixed with a sealing disk, and the lower surface of the sealing disk is fixed with a sealing gasket, the outer surface of the top end of the pull rod is slidably provided with a connecting disk, the sliding sleeve and the outer surface of the pull rod are sleeved with a spring, and the two ends of the spring are respectively fixedly connected to the surfaces of the sealing disk and the connecting disk;

[0009] The connection between the lower valve body and the upper valve body is welded and fixed with an external angle steel, and the connection between the lower valve body and the external angle steel on the upper valve body is provided with a rubber sealing ring, and the surface of the external angle steel is provided with a locking hole for bolts to lock the lower valve body and the external angle steel on the upper valve body, so that the lower valve body and the upper valve body can be effectively sealed and connected through the external angle steel and the bolts;

[0010] The top outer surface of the pull rod is provided with a thread, and the top outer surface of the pull rod is threadedly connected to two adjusting nuts for adjusting the position of the connecting disk, and the tightness of the spring can be adjusted by rotating the two adjusting nuts.

[0011] A dust removal system includes a cyclone dust collector and the negative pressure balancing device described above, wherein an installation opening is provided on the surface of the dust removal duct, and the lower valve body is welded and fixed to the inner wall of the installation opening, an air outlet pipe and a dust exhaust pipe are respectively provided at the top and bottom ends of the cyclone dust collector, and an air inlet pipe is provided on the top outer surface of the cyclone dust collector, an end of the air inlet pipe is fixedly connected to one end of the dust removal duct through a sealing flange, and the other end of the dust removal duct is connected to the exhaust pipe of the coke oven, so as to facilitate the connection of the negative pressure balancing device with the dust removal duct.

[0012] Preferably, a base is provided at the bottom of the cyclone dust collector, and a collecting mechanism for collecting dust discharged from the cyclone dust collector is provided on the upper surface of the base;

[0013] The collecting mechanism comprises a dust collecting box, a dust collecting bag, a driving motor and a drainage pipe. The arrangement of the collecting mechanism facilitates the collection of dust discharged by the cyclone dust collector.

[0014] Preferably, the dust box and the driving motor are both fixedly mounted on the upper surface of the base, and one end of the drainage pipe is fixedly connected to the bottom end of the dust exhaust pipe, and the other end of the drainage pipe extends to the interior of the dust box, and a mounting hole is provided on the upper surface of the dust box, and the inner wall of the mounting hole is fixedly connected to the outer surface of the drainage pipe, so that the dust can be drained to the interior of the collection box through the drainage pipe.

[0015] Preferably, the dust bag is arranged inside the dust box, and the bag opening of the dust bag is fixedly connected to the end of the drainage pipe away from the dust exhaust pipe by an iron wire. A rectangular opening is provided on the side of the dust box, and a sealing door panel is hinged on the inner wall of the rectangular opening. A sealing ring is provided at the frame of the sealing door panel, so that the sealing door panel can be opened to replace the dust bag.

[0016] Preferably, a connecting rod is fixedly provided at the output end of the driving motor, a sealing hole is opened on the side of the dust box, and a mounting tube is fixedly provided on the inner wall of the sealing hole, and the end of the connecting rod away from the driving motor extends to penetrate the inner wall of the dust box and extend to the interior of the mounting tube, and the end of the connecting rod located inside the mounting tube is fixedly provided with a blowing fan blade, which can be driven by the rotation of the driving motor to rotate at a high speed to discharge the air inside the dust box.

[0017] Preferably, a ventilation net is fixedly provided on the inner wall at the end of the mounting tube, and a rotating hole for rotation of the connecting rod is opened on the inner wall of the dust collecting box, and interception mesh plates are fixedly provided on the inner walls on both sides of the dust collecting box to prevent external dust from entering the interior of the mounting tube.

[0018] Preferably, a vertical rod is rotatably provided on the inner bottom wall of the drainage tube, and the bottom end of the vertical rod extends to the upper surface of the base and is fixedly provided with a driven bevel gear, the outer surface of the connecting rod is fixedly provided with an active bevel gear that meshes with the driven bevel gear, and the outer surface of the drainage tube is provided with a sealing hole for the rotation of the vertical rod, and the surface of the vertical rod located inside the drainage tube is fixedly provided with a spiral conveying blade, which can be driven to rotate by the rotation of the driving motor, so that the dust in the dust exhaust pipe of the cyclone dust collector can enter the drainage tube as quickly as possible.

[0019] The beneficial effects of the present invention are:

[0020] The negative pressure balancing device and dust removal system described in the present invention, by setting a pressure relief component, when the coke oven smoke is drained through the dust removal pipe, compared with the existing method of adding a gravity balancing valve between the dust removal pipe and the fan, the negative pressure balancing device proposed by the present invention is more stable and has good sealing performance through the setting of four springs when in use.

[0021] The negative pressure balancing device and dust removal system described in the present invention, by providing a cyclone dust collector and a collection mechanism, can effectively remove dust from the flue gas discharged from the coke oven through the cyclone dust collector, and can enable the dust collecting box to effectively drain and adsorb the dust discharged from the cyclone dust collector through a drainage pipe, and finally collect it through a dust collecting bag, thereby achieving the purpose of quickly collecting the discharged dust and facilitating dust discharge and collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the negative pressure balancing device proposed by the present invention;

[0023] Figure 2 It is a bottom view structural schematic diagram of the negative pressure balancing device proposed by the present invention;

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the negative pressure balancing device proposed by the present invention;

[0025] Figure 4 The present invention Figure 3 The enlarged structural diagram at A in the middle;

[0026] Figure 5 The present invention Figure 3 The enlarged structural diagram at B in the middle;

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure of the negative pressure balancing device and the dust removal system proposed by the present invention;

[0028] Figure 7 The present invention Figure 6 The enlarged structural diagram at C in the middle;

[0029] Figure 8 It is a side view structural diagram of the negative pressure balancing device and dust removal system proposed by the present invention;

[0030] Fig. 9 It is a schematic diagram of the cross-sectional structure of the collection mechanism in the dust removal system proposed by the present invention;

[0031] Fig.10 The present invention Fig. 9 The enlarged structural diagram at D in the middle;

[0032] Fig.11 The present invention Fig. 9 Enlarged structural diagram at E in the middle.

[0033] In the figure:

[0034] 100, lower valve body;

[0035] 200, upper valve body;

[0036] 300. Dust removal duct;

[0037] 400, pressure relief assembly; 401, top plate; 402, pressure relief sleeve; 403, sliding sleeve; 404, inner angle steel; 405, tie rod; 406, sealing disc; 407, sealing gasket; 408, connecting disc; 409, spring; 4010, adjusting nut;

[0038] 500, external angle steel;

[0039] 600, cyclone dust collector; 601, air outlet pipe; 602, dust exhaust pipe; 603, air inlet pipe; 604, base;

[0040] 700, collecting mechanism; 701, dust box; 702, dust bag; 703, driving motor; 704, spiral conveying blade; 705, drainage pipe; 706, sealing door plate; 707, connecting rod; 708, mounting pipe; 709, blowing fan blade; 7010, ventilation net; 7011, intercepting net plate; 7012, vertical rod; 7013, driven bevel gear; 7014, driving bevel gear. DETAILED DESCRIPTION

[0041] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0042] Embodiment 1

[0043] like Figures 1 to 6 As shown, a negative pressure balancing device according to an embodiment of the present invention is shown in Figure 1 , Figure 4 , Figure 5 ,include:

[0044] The lower valve body 100 and the upper valve body 200 are welded and fixed on the surface of the dust removal duct 300, and the upper valve body 200 and the lower valve body 100 are fixedly connected by bolts;

[0045] The pressure relief assembly 400 includes a top plate 401 fixedly mounted on the top of the upper valve body 200 by mounting bolts, and the upper surface of the top plate 401 is provided with four pressure relief holes in a rectangular array, and the inner walls of the four pressure relief holes are fixedly provided with pressure relief sleeves 402, and the inner wall of the pressure relief sleeve 402 is slidably provided with a sliding sleeve 403, and the pressure relief assembly 400 also includes an inner angle steel 404 welded and fixed to the inner wall of the upper valve body 200, and the upper surface of the inner angle steel 404 is welded and fixed with a pull rod 405 penetrating the inner angle steel 404 in a rectangular array, and the four pull rods 40 5 respectively penetrates through four sliding sleeves 403 and extends to the top of the sliding sleeve 403, and the inner wall of the sliding sleeve 403 is slidably connected to the outer surface of the pull rod 405, the outer surface of the sliding sleeve 403 is fixedly provided with a sealing disk 406, and the lower surface of the sealing disk 406 is fixedly provided with a sealing gasket 407, and the outer surface of the top of the pull rod 405 is slidably provided with a connecting disk 408, and the outer surfaces of the sliding sleeve 403 and the pull rod 405 are sleeved with a spring 409, and the two ends of the spring 409 are fixedly connected to the surfaces of the sealing disk 406 and the connecting disk 408 respectively.

[0046] Please refer to Figure 1, Figure 3 , Figure 4 The connection between the lower valve body 100 and the upper valve body 200 is welded and fixed with an external angle steel 500, and a rubber sealing ring is provided at the connection between the lower valve body 100 and the external angle steel 500 on the upper valve body 200, and a locking hole is opened on the surface of the external angle steel 500 for convenient bolt locking and connecting the lower valve body 100 and the external angle steel 500 on the upper valve body 200.

[0047] Specifically, by providing the outer angle steel 500 and the bolts, the lower valve body 100 and the upper valve body 200 can be quickly connected.

[0048] Please refer to Figure 3 , Figure 5 The top outer surface of the pull rod 405 is threaded, and the top outer surface of the pull rod 405 is threadedly connected to two adjusting nuts 4010 for adjusting the position of the connecting plate 408 .

[0049] Specifically, by setting two adjusting nuts 4010, the connecting disk 408 can be driven to move upward or downward by rotating the two adjusting nuts 4010, so as to adjust the tightness of the spring 409, thereby facilitating pressure calibration, that is, the sealing disk 406 will move upward under a certain pressure value.

[0050] In this embodiment, by setting a pressure relief assembly 400, when the coke oven flue gas is drained through the dust removal duct 300, when the pressure in the dust removal duct 300 is between 3500 and 3800Pa, the pressure in the dust removal duct 300 will push the sealing gasket 407 and the sealing disk 406 upward through the pressure relief sleeve 402, so that the pressure in the dust removal duct 300 is automatically relieved through the pressure relief sleeve 402. When the pressure in the dust removal duct 300 is less than 3500Pa, the sealing disk 406 and the sealing gasket 407 can be pressed against the upper surface of the top plate 401 under the action of the spring 409, thereby achieving effective sealing of the pressure relief sleeve 402, and thus making the negative pressure balancing device more stable and having good sealing performance during actual use compared with the existing method of adding a gravity balancing valve between the dust removal duct 300 and the fan.

[0051] Embodiment 2

[0052] like Figures 6 to 11 As shown in the comparative example 1, the present invention further proposes a dust removal system,

[0053] Please refer to Figure 6 , Figure 7, including a cyclone dust collector 600 and a negative pressure balancing device as in Example 1, a mounting opening is provided on the surface of the dust removal duct 300, and the lower valve body 100 is welded and fixed to the inner wall of the mounting opening, an air outlet pipe 601 and a dust exhaust pipe 602 are respectively provided at the top and bottom ends of the cyclone dust collector 600, and an air inlet pipe 603 is provided on the outer surface of the top end of the cyclone dust collector 600, an end of the air inlet pipe 603 is fixedly connected to one end of the dust removal duct 300 through a sealing flange, and the other end of the dust removal duct 300 is connected to the smoke exhaust pipe of the coke oven.

[0054] Specifically, by providing the dust exhaust pipe 602 , it is convenient to discharge the dust inside the cyclone dust collector 600 .

[0055] Please refer to Figure 8 , Fig. 9 , Fig.10 , a base 604 is provided at the bottom of the cyclone dust collector 600, and a collecting mechanism 700 for collecting dust discharged from the cyclone dust collector 600 is provided on the upper surface of the base 604;

[0056] The collecting mechanism 700 includes a dust box 701 , a dust bag 702 , a driving motor 703 and a drainage pipe 705 .

[0057] Specifically, by providing the collecting mechanism 700 , negative pressure can be generated inside the dust box 701 under the action of the driving motor 703 , so that the dust is adsorbed into the dust bag 702 through the drainage pipe 705 for collection.

[0058] Please refer to Fig.10 , Fig.11 The dust box 701 and the driving motor 703 are both fixedly mounted on the upper surface of the base 604, and one end of the drainage pipe 705 is fixedly connected to the bottom end of the dust exhaust pipe 602, and the other end of the drainage pipe 705 extends to the interior of the dust box 701, and a mounting hole is opened on the upper surface of the dust box 701, and the inner wall of the mounting hole is fixedly connected to the outer surface of the drainage pipe 705.

[0059] Specifically, by providing the drainage pipe 705 , the dust discharged from the dust exhaust pipe 602 of the cyclone dust collector 600 can be easily drained into the interior of the dust collecting bag 702 .

[0060] Please refer to Fig.11 The dust bag 702 is arranged inside the dust box 701, and the bag opening of the dust bag 702 is fixedly connected to the end of the drainage pipe 705 away from the dust exhaust pipe 602 through an iron wire. A rectangular opening is opened on the side of the dust box 701, and a sealing door panel 706 is hinged on the inner wall of the rectangular opening, and a sealing ring is arranged at the frame of the sealing door panel 706.

[0061] Specifically, by providing the sealing door panel 706, the dust bag 702 can be replaced after the sealing door panel 706 is opened, which provides convenience for the processing personnel.

[0062] Please refer to Fig.11 A connecting rod 707 is fixedly provided at the output end of the driving motor 703, a sealing hole is opened on the side of the dust box 701, and a mounting tube 708 is fixedly provided on the inner wall of the sealing hole, and one end of the connecting rod 707 away from the driving motor 703 extends to penetrate the inner wall of the dust box 701 and extends to the inside of the mounting tube 708, and a blowing fan blade 709 is fixedly provided at one end of the connecting rod 707 located inside the mounting tube 708.

[0063] Specifically, by setting the blowing fan blades 709, after the driving motor 703 is started, the blowing fan blades 709 can be driven to rotate at high speed, and the air in the dust box 701 is discharged, so that negative pressure is generated inside the dust box 701, thereby facilitating dust to enter the interior of the dust box 701 through the drainage pipe 705.

[0064] Please refer to Fig. 9 , Fig.11 A ventilation net 7010 is fixedly arranged on the inner wall of the end of the mounting tube 708 , and a rotating hole for the connecting rod 707 to rotate is opened on the inner wall of the dust collecting box 701 , and interception net plates 7011 are fixedly arranged on the inner walls of both sides of the dust collecting box 701 .

[0065] Specifically, by providing the intercepting mesh plate 7011, the dust bag 702 can be effectively supported.

[0066] Please refer to Fig.10 A vertical rod 7012 is rotatably provided on the inner bottom wall of the drainage tube 705, and the bottom end of the vertical rod 7012 extends to the upper surface of the base 604 and is fixedly provided with a driven bevel gear 7013, and an active bevel gear 7014 meshing with the driven bevel gear 7013 is fixedly provided on the outer surface of the connecting rod 707, and a sealing hole for the rotation of the vertical rod 7012 is opened on the outer surface of the drainage tube 705, and a spiral conveying blade 704 is fixedly provided on the surface of the vertical rod 7012 located inside the drainage tube 705.

[0067] Specifically, by providing the spiral conveying blade 704 , the spiral conveying blade 704 can be driven to rotate inside the drainage pipe 705 after the driving motor 703 is started, so that the dust in the dust exhaust pipe 602 can quickly enter the interior of the drainage pipe 705 .

[0068] In this embodiment, by providing a cyclone dust collector 600 and a collecting mechanism 700, the cyclone dust collector 600 can be used to effectively remove dust from the flue gas discharged from the coke oven. After the dust removal is completed, the dust exhaust pipe 602 of the cyclone dust collector 600 can be opened, and the drive motor 703 can be started, so that the dust collecting box 701 can effectively drain and adsorb the dust discharged from the cyclone dust collector 600 through the drainage pipe 705, and finally collect it through the dust collecting bag 702, thereby achieving the purpose of quickly collecting the discharged dust.

[0069] Working principle:

[0070] In the initial state, the sealing gasket 407 and the sealing disk 406 can be pressed against the top of the top plate 401 under the action of the spring 409, and the cyclone dust collector 600 is started to guide the flue gas discharged from the coke oven through the dust removal pipe 300. When the pressure in the dust removal pipe 300 is 3500-3800Pa, the pressure in the dust removal pipe 300 will push the sealing gasket 407 and the sealing disk 406 upward through the pressure relief sleeve 402, so that the pressure in the dust removal pipe 300 is automatically relieved through the pressure relief sleeve 402. When the pressure in the dust removal duct 300 is less than 3500Pa, the sealing disk 406 and the sealing gasket 407 can be pressed against the upper surface of the top plate 401 under the action of the spring 409, thereby achieving effective sealing of the pressure relief sleeve 402, thereby making the negative pressure balancing device more stable and having good sealing performance during actual use, compared with the existing method of adding a gravity balancing valve between the dust removal duct 300 and the fan. After the dust removal is completed, the dust exhaust pipe 602 of the cyclone dust collector 600 can be opened, and the driving motor 703 can be started. The rotation of the driving motor 703 drives the connecting rod 707 to rotate. The rotation of the connecting rod 707 drives the fan blades 709 to rotate at high speed inside the mounting tube 708, and the air in the dust box 701 is discharged, so that the dust box 701 generates negative pressure, so that the dust box 701 can effectively drain and absorb the dust discharged from the cyclone dust collector 600 through the drainage pipe 705, and finally collect it through the dust bag 702, so as to achieve The purpose of quickly collecting the discharged dust is achieved, and the connecting rod 707 can drive the active bevel gear 7014 to rotate during the rotation. The rotation of the active bevel gear 7014 drives the driven bevel gear 7013 and the vertical rod 7012 to rotate. The rotation of the vertical rod 7012 drives the spiral conveying blade 704 to rotate inside the drainage pipe 705, so that the dust in the dust exhaust pipe 602 can quickly enter the drainage pipe 705, avoiding dust clogging inside the drainage pipe 705, thereby facilitating dust discharge and dust collection.

[0071] An example of the present specific implementation mode is described above, but the present embodiment is not limited to the above-mentioned specific implementation mode, which is merely illustrative and not restrictive. A person skilled in the art may make many forms inspired by the present embodiment, all of which are protected by the present embodiment.

Claims

1. A negative pressure balancing device, characterized in that: include: A lower valve body (100) and an upper valve body (200), wherein the lower valve body (100) is welded and fixed on the surface of the dust removal duct (300), and the upper valve body (200) and the lower valve body (100) are fixedly connected by bolts; A pressure relief assembly (400), the pressure relief assembly (400) comprising a top plate (401) fixedly mounted on the top of an upper valve body (200) by mounting bolts, and the top surface of the top plate (401) is provided with four pressure relief holes in a rectangular array, the inner walls of the four pressure relief holes are all provided with pressure relief sleeves (402), the inner wall of the pressure relief sleeve (402) is slidably provided with a sliding sleeve (403), the pressure relief assembly (400) further comprising an inner angle steel (404) welded and fixedly mounted on the inner wall of the upper valve body (200), the upper surface of the inner angle steel (404) is provided with a pull rod (405) penetrating the inner angle steel (404) welded and fixedly mounted in a rectangular array, the four pull rods (405) 5), the top end of each of the sliding sleeves (403) respectively passes through four sliding sleeves (403) and extends to the top end of the sliding sleeves (403), and the inner wall of the sliding sleeve (403) is slidably connected to the outer surface of the pull rod (405), a sealing disk (406) is fixedly provided on the outer surface of the sliding sleeve (403), and a sealing gasket (407) is fixedly provided on the lower surface of the sealing disk (406), a connecting disk (408) is slidably provided on the outer surface of the top end of the pull rod (405), a spring (409) is sleeved on the outer surfaces of the sliding sleeve (403) and the pull rod (405), and the two ends of the spring (409) are fixedly connected to the surfaces of the sealing disk (406) and the connecting disk (408) respectively; A cyclone dust collector (600), wherein a mounting opening is provided on the surface of the dust removal duct (300), and the lower valve body (100) is welded and fixed to the inner wall of the mounting opening; an air outlet pipe (601) and a dust exhaust pipe (602) are respectively provided at the top and bottom ends of the cyclone dust collector (600), and an air inlet pipe (603) is provided on the outer surface of the top end of the cyclone dust collector (600); an end of the air inlet pipe (603) is fixedly connected to one end of the dust removal duct (300) through a sealing flange, and the other end of the dust removal duct (300) is connected to the exhaust pipe of the coke oven; a base (601) is provided at the bottom of the cyclone dust collector (600) 04), and a collecting mechanism (700) for collecting dust discharged from the cyclone dust collector (600) is provided on the upper surface of the base (604); the collecting mechanism (700) comprises a dust collecting box (701), a dust collecting bag (702), a driving motor (703) and a drainage pipe (705); the dust collecting box (701) and the driving motor (703) are both fixedly arranged on the upper surface of the base (604), and one end of the drainage pipe (705) is fixedly connected to the bottom end of the dust exhaust pipe (602), and the other end of the drainage pipe (705) extends to the interior of the dust collecting box (701), and the upper surface of the dust collecting box (701) A mounting hole is provided on the surface, and the inner wall of the mounting hole is fixedly connected to the outer surface of the drainage pipe (705); the dust bag (702) is arranged inside the dust box (701), and the bag opening of the dust bag (702) is fixedly connected to the end of the drainage pipe (705) away from the dust exhaust pipe (602) through an iron wire; a rectangular opening is provided on the side of the dust box (701), and a sealing door plate (706) is hinged on the inner wall of the rectangular opening, and a sealing ring is provided on the frame of the sealing door plate (706); a connecting rod (707) is fixedly provided at the output end of the driving motor (703), and a connecting rod (707) is provided on the side of the dust box (701) A sealing hole is provided, and a mounting tube (708) is fixedly arranged on the inner wall of the sealing hole, and one end of the connecting rod (707) away from the driving motor (703) extends to penetrate the inner wall of the dust collecting box (701) and extends to the inside of the mounting tube (708), and one end of the connecting rod (707) located inside the mounting tube (708) is fixedly arranged with a blowing fan blade (709); a ventilation net (7010) is fixedly arranged on the inner wall of the end of the mounting tube (708), and a rotating hole for the connecting rod (707) to rotate is opened on the inner wall of the dust collecting box (701), and interception net plates (7011) are fixedly arranged on the inner walls of both sides of the dust collecting box (701);The inner bottom wall of the drainage tube (705) is rotatably provided with a vertical rod (7012), and the bottom end of the vertical rod (7012) extends to the upper surface of the base (604) and is fixedly provided with a driven bevel gear (7013), the outer surface of the connecting rod (707) is fixedly provided with a driving bevel gear (7014) that meshes with the driven bevel gear (7013), and the outer surface of the drainage tube (705) is provided with a sealing hole for the vertical rod (7012) to rotate, and the surface of the vertical rod (7012) located inside the drainage tube (705) is fixedly provided with a spiral conveying blade (704). ; 2. A negative pressure balancing device according to claim 1, characterized in that: The connection between the lower valve body (100) and the upper valve body (200) is welded and fixed with an external angle steel (500), and the connection between the lower valve body (100) and the external angle steel (500) on the upper valve body (200) is provided with a rubber sealing ring, and the surface of the external angle steel (500) is provided with a locking hole for facilitating the locking connection between the lower valve body (100) and the external angle steel (500) on the upper valve body (200) by bolts.

3. A negative pressure balancing device according to claim 1, characterized in that: The top outer surface of the pull rod (405) is provided with a thread, and the top outer surface of the pull rod (405) is threadedly connected to two adjusting nuts (4010) for adjusting the position of the connecting plate (408).

4. A dust removal system, characterized in that: It comprises the negative pressure balancing device as described in any one of claims 1 to 3.

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