A sector-shaped blind valve for regulating fluid flow and a method thereof.

Abstract

This invention discloses a sector-shaped blind flange valve and its method for regulating fluid flow, relating to the field of valves. It includes: a detachable valve body with two symmetrically arranged movable core plates slidably mounted inside. Each movable core plate has a central circular hole. Flange rings are fixedly installed on the opposite ends of the two movable core plates. The invention uses a locking unit to clamp or release the blind flange. When the position of the blind flange is adjusted, a cleaning unit is triggered, removing impurities adhering to the surface of the sealing gasket. Simultaneously, under the action of the slag discharge unit, impurities inside the protective cover are automatically discharged, preventing excessive accumulation of impurities inside the protective cover. This ensures that a large amount of impurities does not adhere to the sealing gasket each time the closed and open plates are switched. Furthermore, the squeezing of the sealing gasket by the movable core plates prevents accelerated aging of the sealing gasket due to the squeezing of impurities.

Description

Technical Field

[0001] This invention relates to the field of valves, specifically to a sector-shaped blind valve and its method for regulating fluid flow. Background Technology

[0002] A blind flange valve is a gate valve that can be driven manually, electrically, pneumatically, or hydraulically. It is widely used in converter gas, blast furnace gas, and flue gas heating furnace gas applications. The working principle of a blind flange valve is as follows: when the blind flange valve needs to cut off the fluid in the pipeline, the hydraulic moving device (i.e., clamping mechanism) is first released to drive the valve plate to move. The valve plate acts like a closed cover, completely covering the pipeline opening, thus achieving the conversion between the through hole and the blind hole on the valve plate. After the conversion is completed, the clamping mechanism is activated to tightly connect the valve plate to the valve body.

[0003] In large, enclosed blind valves (where the valve plate slides within a frame and is not exposed), the sealing gasket is fitted inside the valve body. Because converter gas, blast furnace gas, and flue gas heater gas contain a large amount of small solid particles (i.e., furnace dust), coal dust particles adhere to the contact surfaces between the conveying pipeline and the blind valve and the gas. When the valve plate changes position inside the valve body, the coal dust particles adhering to the inner surface of the valve body are easily dislodged due to the valve plate's movement, causing coal dust particles to adhere to the valve plate as well. If these coal dust particles adhere to the valve plate, the subsequent hydraulic clamping mechanism in the valve body will squeeze the valve plate, causing the coal dust particles to be pressed onto the sealing gasket. Repeated squeezing and releasing of these particles accelerates the elastic fatigue of the sealing gasket, causing cracks and damage to appear in a short time, affecting the sealing effect. Summary of the Invention

[0004] The purpose of this invention is to provide a sector-shaped blind valve and a method thereof for regulating fluid flow, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a sector-shaped blind flange valve for regulating fluid flow, comprising: a detachable valve body, wherein two movable core plates symmetrically distributed front and rear are slidably fitted inside the valve body, each movable core plate having a central circular hole inside, and flange rings are fixedly provided on the opposite ends of the two movable core plates for connecting pipes; a blind flange is placed between the two movable core plates, and a closed plate and an open plate are fixedly provided inside the blind flange, the closed plate and the open plate being arranged side by side. Both the closed plate and the open plate are fixedly fitted with sealing gaskets at their centers. The upper and lower end faces of the blind plate are fixedly provided with thick strip plates. The blind plate and the thick strip plates are movably fitted between the two movable core plates. The valve body is also provided with two sets of empty slots inside, with two empty slots in each set, and they are arranged vertically. Each empty slot is also rotatably fitted with a pulley. The two sets of pulleys arranged vertically limit the two thick strip plates. The left and right ends of the valve body are fixedly fitted with protective covers, which protect the closed plate.

[0006] It also includes: a cleaning unit that removes impurities adhering to the outer surface of the sealing gasket by rotation, the cleaning unit being disposed inside each of the protective covers;

[0007] A slag discharge unit is used to discharge the impurities removed by the cleaning unit into the interior of the protective cover. The slag discharge unit is located at the bottom of each protective cover.

[0008] A locking unit is provided on the outside of the valve body to drive the two movable core plates to clamp and release the blind plate.

[0009] Preferably, the cleaning unit includes two cleaning brush discs arranged in a front-to-back opposite manner, rotatably assembled inside each of the protective covers. The cleaning brush discs do not contact the thick strip plate. The bristles of the two cleaning brush discs located inside the same protective cover are arranged facing each other. A gear roller is also rotatably arranged inside each protective cover. The gear roller is located below the blind plate. The lower end face of the thick strip plate located below has several toothed grooves arranged in a straight line at equal intervals. The thick strip plate is movably engaged with the gear roller through the toothed grooves. A first synchronous gear is concentrically fixed on the end face of the cleaning brush disc away from the blind plate. A first synchronous toothed belt is connected between the first synchronous gear and the gear roller. A threaded rod is threaded inside the thick strip plate located below. Both ends of the threaded rod rotatably pass through the protective cover. An electric motor is fixedly mounted on the end of one of the protective covers away from the valve body. The output end of the electric motor is fixed to the end of the threaded rod through a coupling.

[0010] Preferably, the slag discharge unit includes an extension frame fixedly mounted at the bottom of each of the protective covers, and the extension frame is interconnected with the bottom of the protective cover. At least two impellers are rotatably mounted at the bottom of each extension frame. A gear differential is fixedly mounted at the end of each of the two protective covers away from the valve body, and the gear differential is located below the threaded rod. The output end of the gear differential faces downward. A second synchronous gear is fixedly fitted at the output end of the gear differential and at the bottom of the rotating shaft of the impeller. A second synchronous toothed belt is driven and mounted on the outer surface of several second synchronous gears. An auxiliary frame rod is also fixedly mounted at the bottom of the extension frame. The auxiliary frame rod limits the second synchronous toothed belt, so that the meshing of the second synchronous toothed belt with each second synchronous gear will not disengage. A first bevel gear is fixedly mounted at the input end of the gear differential, and second bevel gears are fixedly mounted on the outer surfaces of both ends of the threaded rod. The first bevel gear and the second bevel gear located on the same side mesh with each other.

[0011] Preferably, the sealing gasket is hollow, and when compressed, the sealing gasket retracts into the interior of the closed plate or the open plate.

[0012] Preferably, the two end faces of the protective cover away from the blind plate are both detachable structures.

[0013] Preferably, the locking unit includes levers fixedly mounted at the upper and lower ends of each of the movable core plates. The valve body also has a first straight groove for the levers to slide a short distance inside. Worm gears are rotatably mounted on the upper and lower end faces of the valve body, and the worm gears are located at the center of the upper and lower end faces of the valve body. Each worm gear has an arc groove inside, and the lever is slidably embedded in the arc groove. The distance between the two ends of the arc groove and the center of the worm gear is inconsistent. Rotary shafts are rotatably mounted on the upper and lower end faces of the valve body, and worm gears are fixedly fitted on the outer surface of the rotating shafts. The worm gears and worm gears located on the same side are connected for transmission. A driving component is also provided between the two rotating shafts and the valve body.

[0014] Preferably, the driving component includes a transmission gear rotatably mounted on one end of the rotating shaft, a curved rack meshing between the two transmission gears, a hydraulic push rod fixedly mounted on the outer wall of the valve body, and a connecting plate fixedly mounted between the output end of the hydraulic push rod and the outside of the curved rack, a second straight groove being formed inside the curved rack, a positioning block being slidably mounted inside the second straight groove, and the positioning block being fixedly mounted to the valve body, the positioning block being rectangular in shape.

[0015] Preferably, a safety assembly is further provided between the connecting plate and the valve body. The safety assembly includes an assembly plate fixedly mounted on the outside of the valve body, and the assembly plate has a third straight groove inside. A positioning post is slidably embedded in the end of the connecting plate away from the curved rack. A second spring is fixedly provided between the end of the positioning post near the curved rack and the connecting plate. The positioning post slides through the third straight groove. A rubber collar is rotatably fitted on the outer surface of the positioning post, and the rubber collar is located on the side of the assembly plate away from the curved rack. The assembly plate is a friction plate. A sliding seat is also axially slidably mounted on the outside of the assembly plate, and the positioning post slides through the sliding seat. A cam is rotatably mounted on the end of the sliding seat away from the curved rack. The end of the positioning post slides in contact with the outer surface of the cam. A positioning element is provided between the positioning post and the cam.

[0016] Preferably, the positioning element includes a positioning hole formed at the center of the end of the positioning post away from the curved rack; a handle is fixedly mounted on the outside of the cam; a limiting disk is slidably mounted inside the cam; the axis of the limiting disk coincides with the long axis of the cam; the handle is parallel to the long axis of the cam; a domed pin is fixedly mounted at the end of the limiting disk away from the handle, which slides through the cam and engages with the positioning hole; a lever is slidably mounted inside the handle; a connecting rod is fixedly mounted between the lever and the limiting disk; the connecting rod is slidably mounted with the cam and the handle; a first spring is also mounted on the outer surface of the connecting rod, and the first spring is distributed between the end of the limiting disk away from the domed pin and the inside of the cam.

[0017] An operating method for a sector-shaped blind valve used to regulate fluid flow, the operating method comprising the following steps:

[0018] S1, during the state switching stage of the movable core plate, the hydraulic push rod drives the worm gear to rotate through the cooperation of the curved rack and the transmission gear. Since the lever is simultaneously restricted by the first straight groove and the arc groove, the two movable core plates move synchronously towards each other to clamp the blind plate, or the two movable core plates move synchronously away from each other to release the blind plate.

[0019] S2, during the adjustment stage of the closed and open plates, based on the fact that the blind plate is in a released state by the two movable core plates, the blind plate can be moved laterally inside the valve body by the rotation of the threaded rod and the restriction of the thick plate by the valve body and the protective cover, thereby adjusting the position of the closed and open plates.

[0020] S3, Impurity cleaning stage: When the thick strip plate located below moves, it can drive the gear roller to rotate through the tooth groove. Under the action of the first synchronous toothed belt and the first synchronous gear, the cleaning disc rotates, which can brush out the impurities on the surface of the closed plate and the open plate during the lateral movement of the blind plate, and let the impurities attached to the surface of the sealing gasket fall off.

[0021] S4. Automatic impurity discharge stage: Through the action of the first bevel gear, the second bevel gear and the gear differential, when the threaded rod rotates, the impeller inside the extension frame is driven to rotate. The impeller sucks down and discharges the impurities that are floating or adhering to the inside of the protective cover.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This invention uses a locking unit to clamp or release the blind plate. When the position of the blind plate is adjusted, the cleaning unit is triggered to operate. The cleaning unit can remove impurities adhering to the surface of the sealing gasket. At the same time, under the action of the slag discharge unit, impurities inside the protective cover are automatically discharged, preventing excessive accumulation of impurities inside the protective cover. In this way, it can be ensured that a large amount of impurities will not adhere to the sealing gasket each time the closed plate and open plate are replaced. When the movable core plate squeezes the sealing gasket, it also avoids the aging of the sealing gasket due to the compression of impurities. Attached Figure Description

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the internal structure of the valve body and protective cover of the present invention;

[0026] Figure 3 This is a schematic diagram of the blind plate and thick strip plate structure of the present invention;

[0027] Figure 4 This is a cross-sectional view of the valve body of the present invention;

[0028] Figure 5 This is a schematic diagram of the hydraulic push rod position distribution structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the internal structure of the cam of the present invention;

[0030] Figure 7 This is a schematic diagram of the threaded rod and gear differential structure of the present invention;

[0031] Figure 8 This is a schematic diagram of the cleaning brush disk structure of the present invention;

[0032] Figure 9 This is a schematic diagram of the impeller and auxiliary support structure of the present invention.

[0033] In the diagram: 1. Valve body; 2. Movable core plate; 3. First straight groove; 4. Pulley; 5. Worm gear; 6. Arc groove; 7. Shaft; 8. Worm; 9. Transmission gear; 10. Curved rack; 11. Blind plate; 12. Closed plate; 13. Open plate; 14. Sealing gasket; 15. Thick strip plate; 16. Hollow groove; 17. Pulley; 18. Hydraulic push rod; 19. Connecting plate; 20. Second straight groove; 21. Positioning block; 22. Assembly plate; 23. Third straight groove; 24. Positioning 25. Column; 26. Rubber collar; 27. Positioning hole; 28. Sliding seat; 29. ​​Cam; 30. Handle; 31. Limiting plate; 32. Dome pin; 33. Connecting rod; 34. First spring; 35. Pulley; 36. Protective cover; 37. Gear roller; 38. First synchronizing gear; 39. Cleaning brush plate; 40. Threaded rod; 41. Gear differential; 42. Extension frame; 43. Impeller; 44. Second synchronizing gear; 45. Second synchronizing belt; 46. Auxiliary frame rod. Detailed Implementation

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0035] Example 1: Please refer to Figure 1-Figure 5The diagram illustrates a sector-shaped blind flange valve for regulating fluid flow, comprising: a detachable valve body 1; two symmetrically arranged movable core plates 2 slidingly mounted inside the valve body 1; each movable core plate 2 having a central circular hole; flange rings fixedly mounted on the opposite ends of the two movable core plates 2 for connecting pipes; a blind flange 11 placed between the two movable core plates 2; and a closed plate 12 and an open plate 13 fixedly mounted inside the blind flange 11, arranged side-by-side; a sealing gasket 14 fixedly mounted at the center of each of the closed plate 12 and open plate 13; and thick strip plates 15 fixedly mounted on the upper and lower end faces of the blind flange 11. The blind flange 11 and the thick strip plates 15 are movably mounted within... Between the two movable core plates 2, there are two sets of empty slots 16 inside the valve body 1. Each set of empty slots 16 has two slots and they are arranged vertically. Each empty slot 16 is also equipped with a pulley 17. The two sets of pulleys 17 arranged vertically limit the two thick plates 15. The upper end face of the upper thick plate 15 and the lower end face of the lower thick plate 15 only contact the rolling pulley 17, thereby avoiding large frictional wear between the blind plate 11 and the inside of the valve body 1 when it moves back and forth. The left and right ends of the valve body 1 are fixedly connected with protective covers 35. The protective covers 35 protect the sealing plate 12. The thick plates 15 and the protective covers 35 are also designed to be inserted and fitted.

[0036] It also includes: a cleaning unit that cleans impurities adhering to the outer surface of the sealing gasket 14 by rotation, the cleaning unit being disposed inside each protective housing 35;

[0037] A locking unit is used to drive the two movable core plates 2 to clamp and release the blind plate 11. The locking unit is located outside the valve body 1.

[0038] The cleaning unit includes two cleaning brush discs 38 arranged in a front-to-back configuration, rotatably mounted inside each protective housing 35. The cleaning brush discs 38 do not contact the thick plate 15. The bristles of the two cleaning brush discs 38 located inside the same protective housing 35 are arranged facing each other. A gear roller 36 is also rotatably mounted inside each protective housing 35, located below the blind plate 11. The lower end face of the thick plate 15 located below has several linearly equidistant toothed grooves. The thick plate 15 engages with the gear roller 36 through these grooves. A first synchronous gear 37 is concentrically fixed on the end face of the cleaning brush disc 38 away from the blind plate 11. A first synchronous toothed belt is installed between the wheel 37 and the gear roller 36 for transmission. A threaded rod 39 is installed inside the thick strip plate 15 located below, and both ends of the threaded rod 39 rotate through the protective cover 35. One of the protective covers 35 is fixedly mounted with a motor at the end away from the valve body 1, and the output end of the motor is fixed to the end of the threaded rod 39 by a coupling. When the thick strip plate 15 moves, it meshes with the gear roller 36 through the tooth groove, driving the first synchronous gear 37 and the cleaning brush disc 38 to rotate. When the cleaning brush disc 38 rotates, it can brush off the coal dust and impurities adhering to the surface of the closed plate 12, the open plate 13 and the sealing gasket 14 through the brush bristles.

[0039] The sealing gasket 14 is hollow. When the sealing gasket 14 is compressed, it retracts into the interior of the closed plate 12 or the open plate 13. That is, after the two movable core plates 2 effectively compress the blind plate 11, the sealing gasket 14 can retract into the interior of the closed plate 12 or the open plate 13 under pressure, so that there will be no gap between the closed plate 12 or the open plate 13 and the movable core plate 2. It should be noted that the thickness of the blind plate 11, the closed plate 12 and the open plate 13 is the same.

[0040] The two end faces of the protective cover 35 away from the blind plate 11 are both detachable, meaning that the panel of the protective cover 35 can be removed to facilitate the replacement of the sealing gasket 14.

[0041] The locking unit includes levers 4 fixedly mounted at the upper and lower ends of each movable core plate 2. The valve body 1 also has a first straight groove 3 for short-distance sliding of the levers 4. Worm gears 5 are rotatably mounted on the upper and lower end faces of the valve body 1, and the worm gears 5 are located at the center of the upper and lower end faces of the valve body 1. Each worm gear 5 has an arc groove 6 inside, and the levers 4 are slidably embedded in the arc groove 6. The distance between the two ends of the arc groove 6 and the center of the worm gear 5 is inconsistent. Since the levers 4 are simultaneously restricted by the first straight groove 3 and the arc groove 6, when the worm gear 5 rotates, the two movable core plates 2 can move synchronously in opposite directions through the levers 4. Rotating shafts 7 are rotatably mounted on the upper and lower end faces of the valve body 1, and worm gears 8 are fixedly mounted on the outer surface of the rotating shafts 7. The worm gears 5 and worm gears 8 on the same side are connected by a transmission assembly. A driving component is also provided between the two rotating shafts 7 and the valve body 1.

[0042] The driving component includes a transmission gear 9 rotatably mounted on one end of a rotating shaft 7. A curved rack 10 is meshed between two transmission gears 9. A hydraulic push rod 18 is fixedly mounted on the outer wall of the valve body 1. A connecting plate 19 is fixedly mounted between the output end of the hydraulic push rod 18 and the outside of the curved rack 10. A second straight groove 20 is opened inside the curved rack 10. A positioning block 21 is slidably assembled inside the second straight groove 20. The positioning block 21 is fixedly assembled with the valve body 1. The positioning block 21 is rectangular. By embedding the rectangular positioning block 21 inside the second straight groove 20, the stability of the axial movement of the curved rack 10 can be ensured.

[0043] Example 2: Please refer to Figures 7-9 This embodiment is a further explanation of Embodiment 1. The slag discharge unit is used to discharge impurities removed by the cleaning unit into the interior of the protective cover 35. The slag discharge unit is located at the bottom of each protective cover 35 and includes an extension frame 41 fixedly mounted at the bottom of each protective cover 35, and the extension frame 41 communicates with the bottom of the protective cover 35. At least two impellers 42 are rotatably mounted at the bottom of each extension frame 41. A gear differential 40 is fixedly mounted at the end of each of the two protective covers 35 away from the valve body 1, and the gear differential 40 is located below the threaded rod 39, with the output end of the gear differential 40 facing downwards. A second synchronizing gear is fixedly fitted at the bottom of the output end of the gear differential 40 and the rotating shaft of the impellers 42. The outer surfaces of several second synchronous gears 43 are equipped with second synchronous toothed belts 44. An auxiliary frame rod 45 is also fixedly mounted at the bottom of the extension frame 41. The auxiliary frame rod 45 limits the second synchronous toothed belt 44, so that the meshing between the second synchronous toothed belt 44 and each second synchronous gear 43 will not disengage. The input end of the gear differential 40 is fixedly equipped with a first bevel gear, and the outer surfaces of both ends of the threaded rod 39 are fixedly equipped with second bevel gears. The first bevel gear and the second bevel gear on the same side mesh with each other. The gear differential 40 has a speed-increasing effect. That is, when the threaded rod 39 rotates slowly, it can transmit through the gear differential 40 to make the output end of the gear differential 40 drive the impeller 42 to rotate at high speed.

[0044] Example 3: Please refer to Figure 6This embodiment is a further explanation of Embodiment 1. A safety assembly is also provided between the connecting plate 19 and the valve body 1. The safety assembly includes an assembly plate 22 fixedly mounted on the outside of the valve body 1, and the assembly plate 22 has a third straight groove 23 inside. A positioning post 24 is slidably embedded in the end of the connecting plate 19 away from the curved rack 10. A second spring is fixedly provided between the end of the positioning post 24 near the curved rack 10 and the connecting plate 19. The positioning post 24 slides through the third straight groove 23. A rubber collar 25 is rotatably fitted on the outer surface of the positioning post 24, and the rubber collar 25 is located on the assembly plate 22 away from the curved rack 10. On one side of the rack 10, the mounting plate 22 is a friction plate, that is, the end face of the mounting plate 22 away from the curved rack 10 has a friction structure, such as grooves, protrusions, etc. When the rubber collar 25 is pressed against the surface of the mounting plate 22, it can increase the friction between the mounting plate 22 and the rubber collar 25. The outer side of the mounting plate 22 is also axially slidably mounted with a sliding seat 27, and the positioning post 24 slides through the sliding seat 27. The end of the sliding seat 27 away from the curved rack 10 is rotatably mounted with a cam 28. The end of the positioning post 24 slides in contact with the outer surface of the cam 28. A positioning element is provided between the positioning post 24 and the cam 28.

[0045] The positioning component includes a positioning hole 26 located at the center of the end of the positioning post 24 away from the curved rack 10. A handle 29 is fixedly mounted externally on the cam 28. A limiting disk 30 is slidably mounted internally on the cam 28, with its axis coinciding with the long axis of the cam 28. The handle 29 is parallel to the long axis of the cam 28. A domed pin 31, which slides through the cam 28, is fixedly mounted at the end of the limiting disk 30 away from the handle 29, and engages with the positioning hole 26. The inside of 29 is fitted with a sliding block 34, and a connecting rod 32 is fixedly provided between the sliding block 34 and the limiting plate 30. The connecting rod 32 is slidably fitted with the cam 28 and the handle 29. The handle 29 facilitates the rotation of the cam 28. The cam 28 pushes the positioning pin 24 so that the rubber collar 25 abuts against the surface of the mounting plate 22. The outer surface of the connecting rod 32 is also fitted with a first spring 33, and the first spring 33 is distributed between the end of the limiting plate 30 away from the dome pin 31 and the inside of the cam 28.

[0046] Working principle:

[0047] The hydraulic push rod 18 drives the curved rack 10 to move up and down. During the movement, the meshing of the curved rack 10 with the transmission gear 9 and the meshing of the worm 8 with the worm wheel 5 can cause the worm wheel 5 to deflect. During the deflection, the movable core plate 2 can move synchronously in the opposite direction. When the blind valve in the flow state needs to be switched to the closed state, it drives the two movable core plates 2 to move away from each other and no longer clamp the blind plate 11. Since the coal dust impurities in the boiler gas will adhere to the inner wall of the central hole of the movable core plate 2 and the inner wall of the central hole of the open plate 13 during the boiler gas transmission process, when the two movable core plates 2 are separated, the adhered coal dust impurities are easy to loosen. When the blind plate 11 moves between the two movable core plates 2, the coal dust will adhere to the surface of the sealing gasket 14.

[0048] Given this situation, as shown in the appendix Figure 2 As shown, when the closed plate 12 is driven to replace the open plate 13, the blind plate 11 moves to the right. During the movement, coal dust impurities on the inner wall of the center hole of the open plate 13 will be carried into the interior of the protective cover 35. The movement of the thick plate 15 allows the left cleaning disc 38 to rotate first, and clean the surface of the sealing gasket 14 distributed on the closed plate 12 in advance, so that the closed plate 12 moves to the center of the valve body 1 with the clean sealing gasket 14.

[0049] When the thick plate 15 comes into contact with the gear roller 36 on the right, it can also cause the cleaning disc 38 on the right to rotate, so that the cleaning disc 38 can clean the inner wall of the center hole of the open plate 13 and the sealing gasket 14.

[0050] By cleaning the surface of the closed plate 12 or open plate 13 that is about to be replaced during each switch of the blind plate 11, coal dust can be prevented from adhering to and accumulating on the sealing gasket 14 of both plates. This prevents the movable core plate 2 from squeezing the sealing gasket 14 through the coal dust, thus accelerating the aging of the sealing gasket 14.

[0051] Meanwhile, in this scheme, when the two movable core plates 2 are not clamped to the blind plate 11, there is a large gap between them and the blind plate 11. During the process of the thick strip plate 15 moving with the blind plate 11 driven by the threaded rod 39, the two sets of impellers 42 can also rotate at high speed. The impellers 42 draw the air inside the protective cover 35 downward and discharge it. At the same time, the external airflow can enter the protective cover 35 through the gap between the movable core plate 2 and the blind plate 11. In this way, the floating dust swept down by the cleaning brush 38 can be discharged from the protective cover 35, and coal dust impurities can be prevented from accumulating inside the protective cover 35.

[0052] This design also considers the possibility of a power outage in the factory area. In this case, the hydraulic push rod 18 would be unable to continue applying hydraulic pressure to the worm gear 5, and the two movable core plates 2 might become loose. If the movable core plates 2 become loose, the fluid inside the valve body 1 would leak into the air through the gap between the movable core plates 2 and the blind plate 11. Therefore, in this design, after the movable core plates 2 effectively clamp and limit the blind plate 11, the operator can rotate the cam 28 using the handle 29. The cam 28 pushes the positioning pin 24, causing the rubber collar 25 to tightly press against the surface of the assembly plate 22. The huge friction between the 5 and the assembly plate 22 limits the position between the positioning post 24 and the assembly plate 22. The positioning post 24 can limit the position of the curved rack 10 through the connecting plate 19. After the cam 28 swings 90 degrees to push the positioning post 24, it can also allow the dome pin 31 to be inserted into the positioning hole 26. This ensures that the cam 28 will not loosen after it is pressed against the positioning post 24. In this way, it can cope with sudden situations and ensure that the position of the curved rack 10 does not change, thereby ensuring the stability of the movable core plate 2 clamping the blind plate 11.

[0053] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sector-shaped blind valve for regulating fluid flow, characterized in that, include: The valve body (1) is detachable. Inside the valve body (1) are two symmetrically distributed movable core plates (2). The movable core plates (2) are each provided with a central circular hole. A blind plate (11) is placed between the two movable core plates (2). Inside the blind plate (11) are a closed plate (12) and an open plate (13). A sealing gasket (14) is fixedly installed in the center of the closed plate (12) and the open plate (13). A thick strip plate (15) is fixedly installed on the upper and lower end faces of the blind plate (11). The blind plate (11) and the thick strip plate (15) are movably installed between the two movable core plates (2). The left and right ends of the valve body (1) are fixedly connected and fitted with a protective cover (35). The protective cover (35) protects the closed plate (12). Also includes: A cleaning unit is provided inside each of the protective covers (35) to clean impurities adhering to the outer surface of the sealing gasket (14) by rotation. A slag discharge unit is used to discharge the impurities removed by the cleaning unit into the interior of the protective cover (35), and the slag discharge unit is disposed at the bottom of each protective cover (35); A locking unit is provided on the outside of the valve body (1) to drive the two movable core plates (2) to clamp and release the blind plate (11). The cleaning unit includes two opposing cleaning brush discs (38) rotatably mounted inside each of the protective covers (35). A gear roller (36) is also rotatably mounted inside each of the protective covers (35). The gear roller (36) is located below the blind plate (11). A number of toothed grooves are provided on the lower end face of a thick strip plate (15) located below. The thick strip plate (15) is movably engaged with the gear roller (36) through the toothed grooves. A first synchronous gear (37) is fixedly mounted on the end face of the cleaning brush disc (38) away from the blind plate (11). A first synchronous toothed belt is connected between the first synchronous gear (37) and the gear roller (36). A threaded rod (39) is threaded inside the thick strip plate (15) located below. Both ends of the threaded rod (39) rotatably penetrate the protective cover (35). The slag discharge unit includes an extension frame (41) fixedly mounted at the bottom of each of the protective covers (35), and the extension frame (41) is interconnected with the bottom of the protective cover (35). At least two impellers (42) are rotatably mounted at the bottom of each extension frame (41). A gear differential (40) is fixedly mounted at the end of each of the two protective covers (35) away from the valve body (1). A second synchronous gear (43) is fixedly fitted at the output end of the gear differential (40) and at the bottom of the rotating shaft of the impeller (42). Several second synchronous gears (43) are mounted on each of the two gears. 3) The outer surface of the transmission is equipped with a second synchronous toothed belt (44), and the bottom of the extension frame (41) is also fixedly mounted with an auxiliary frame rod (45). The auxiliary frame rod (45) plays a limiting role on the second synchronous toothed belt (44) so ​​that the meshing of the second synchronous toothed belt (44) with each of the second synchronous gears (43) will not disengage. The input end of the gear differential (40) is fixedly equipped with a first bevel gear, and the outer surfaces of both ends of the threaded rod (39) are fixedly equipped with second bevel gears. The first bevel gear and the second bevel gear located on the same side mesh with each other. The locking unit includes levers (4) fixedly mounted on the upper and lower ends of each movable core plate (2). The valve body (1) also has a first straight groove (3) for sliding of the levers (4). The upper and lower end faces of the valve body (1) are rotatably mounted with worm gears (5). Each worm gear (5) has an arc groove (6) inside. The levers (4) are slidably embedded in the arc grooves (6). The upper and lower end faces of the valve body (1) are rotatably mounted with shafts (7). The outer surface of the shafts (7) is fixedly fitted with worm gears (8). The worm gears (5) and worm gears (8) on the same side are connected by a transmission assembly. A driving component is also provided between the two shafts (7) and the valve body (1).

2. A sector-shaped blind valve for regulating fluid flow according to claim 1, characterized in that: The sealing gasket (14) is hollow, and when the sealing gasket (14) is squeezed, it retracts into the interior of the closed plate (12) or the open plate (13).

3. A sector-shaped blind valve for regulating fluid flow according to claim 1, characterized in that: The two end faces of the protective cover (35) away from the blind plate (11) are both detachable structures.

4. A sector-shaped blind valve for regulating fluid flow according to claim 1, characterized in that: The driving component includes a transmission gear (9) that is rotatably mounted on one end of the rotating shaft (7). A curved rack (10) is provided between the two transmission gears (9). A hydraulic push rod (18) is fixedly mounted on the outer wall of the valve body (1). A connecting plate (19) is fixedly provided between the output end of the hydraulic push rod (18) and the outside of the curved rack (10). A second straight groove (20) is opened inside the curved rack (10). A positioning block (21) is slidably assembled inside the second straight groove (20). The positioning block (21) is fixedly assembled with the valve body (1).

5. A sector-shaped blind valve for regulating fluid flow according to claim 4, characterized in that: A safety assembly is also provided between the connecting plate (19) and the valve body (1). The safety assembly includes an assembly plate (22) fixedly mounted on the outside of the valve body (1), and a third straight groove (23) is provided inside the assembly plate (22). A positioning post (24) is slidably embedded in the end of the connecting plate (19) away from the curved rack (10). A second spring is fixedly provided between the end of the positioning post (24) near the curved rack (10) and the connecting plate (19). The positioning post (24) slides through the connection plate (19). The third straight groove (23) is provided with a rubber collar (25) rotatably fitted on the outer surface of the positioning column (24). The mounting plate (22) is also axially slidably fitted with a sliding seat (27), and the positioning column (24) slides through the sliding seat (27). A cam (28) is rotatably fitted at the end of the sliding seat (27) away from the curved rack (10). The end of the positioning column (24) slides in contact with the outer surface of the cam (28). A positioning element is provided between the positioning column (24) and the cam (28).

6. A sector-shaped blind valve for regulating fluid flow according to claim 5, characterized in that: The positioning component includes a positioning hole (26) opened at one end of the positioning post (24) away from the curved rack (10). A handle (29) is fixedly provided on the outside of the cam (28). A limiting plate (30) is slidably assembled inside the cam (28). A dome pin (31) that slides through the cam (28) is fixedly provided at one end of the limiting plate (30) away from the handle (29). The dome pin (31) is engaged with the positioning hole (26). A lever (34) is slidably assembled inside the handle (29). A connecting rod (32) is fixedly provided between the lever (34) and the limiting plate (30). The connecting rod (32) is slidably assembled with the cam (28) and the handle (29). A first spring (33) is also assembled on the outer surface of the connecting rod (32).

7. An operating method for a sector-shaped blind valve for regulating fluid flow as described in claim 6, characterized in that: The operation method includes the following steps: S1, during the state switching phase of the movable core plate (2), the hydraulic push rod (18) drives the worm gear (8) to rotate with the worm wheel (5) through the cooperation of the curved rack (10) and the transmission gear (9). Since the lever (4) is simultaneously restricted by the first straight groove (3) and the arc groove (6), the two movable core plates (2) move synchronously towards each other to clamp the blind plate (11), or the two movable core plates (2) move synchronously away from each other to release the blind plate (11). S2, during the position adjustment stage of the closed plate (12) and the open plate (13), based on the two movable core plates (2) releasing the blind plate (11), the blind plate (11) can be moved laterally inside the valve body (1) by the rotation of the threaded rod (39) and the restriction of the valve body (1) and the protective cover (35) on the thick strip plate (15), thereby adjusting the position of the closed plate (12) and the open plate (13); S3, Impurity cleaning stage: When the thick strip plate (15) located below moves, it can drive the gear roller (36) to rotate through the tooth groove. Under the action of the first synchronous tooth belt and the first synchronous gear (37), the cleaning disc (38) rotates. That is, during the lateral movement of the blind plate (11), the impurities on the surface of the closed plate (12) and the open plate (13) are brushed off, and the impurities attached to the surface of the sealing gasket (14) fall off. S4. Automatic impurity discharge stage: Through the action of the first bevel gear, the second bevel gear and the gear differential (40), when the threaded rod (39) rotates, the impeller (42) inside the extension frame (41) is driven to rotate. The impeller (42) sucks down and discharges the impurities floating or adhering inside the protective cover (35).

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