Pneumatic butterfly valve for blast furnace gas holder

Abstract

The present application belongs to the technical field of pneumatic butterfly valve, in particular to a blast furnace gas tank pneumatic butterfly valve, which comprises a transmission box installed at the top end of a valve pipe, a valve plate arranged inside the valve pipe, an overpressure opening device arranged at the top end of the valve pipe, a power telescopic rod slidingly installed at the top end of the valve pipe, the power telescopic rod being capable of engaging transmission with the valve plate, a poking block fixedly connected to the power telescopic rod, the upper and lower ends of the poking block being fixedly installed with poking inclined blocks, an overpressure cavity fixedly installed at the top end of the valve pipe, an overpressure column movably inserted into the overpressure cavity, a jacking plate fixedly connected to the outer wall of the overpressure column, a first limiting plate and a second limiting plate slidingly installed at the top end of the valve pipe, and the overpressure opening device and the air tightness detection device being used to automatically open and close the valve according to the pressure when the valve is powered off, thereby reducing the risk that the dust on the surface of the valve plate caused by the medium passing through the valve may cover the valve plate and cause the valve plate to be unable to be completely closed.

Description

Technical Field

[0001] This invention belongs to the field of pneumatic butterfly valves, specifically a pneumatic butterfly valve for blast furnace gas holders. Background Technology

[0002] A pneumatic butterfly valve consists of a pneumatic actuator and a butterfly valve. It uses a circular disc that rotates with the valve stem to open and close, achieving the desired action. Primarily used as a shut-off valve, most butterfly valves are placed in locations difficult to operate manually, or where manual closure is required from a distant location. This can lead to situations where the butterfly valve remains open during operation, causing pressure to continuously increase in the running machine. Furthermore, in the event of a power outage, it may not automatically close based on pressure, potentially leading to a sustained increase in pressure and a risk of explosion.

[0003] A patent application with publication number CN114321405A discloses a pneumatic butterfly valve, including a valve body and a valve plate located within the valve body; a control mechanism located on the valve body, and the control mechanism is connected to the valve plate via a rotating shaft; wherein the control mechanism includes a pneumatic control module and an auxiliary control module, the auxiliary control module including a mounting box, at least one set of transmission components, and a drive component used in conjunction with the transmission components. This invention features an innovative structure, effectively avoiding the problem that the pneumatic butterfly valve will be uncontrollable after the pneumatic control module is damaged, which could easily lead to safety accidents in emergency situations and make it inconvenient to use.

[0004] Therefore, although the above-mentioned device can use two modules to prevent uncontrollable pressure increases that may occur when the main current fails, the pneumatic butterfly valve generates a lot of heat during use. Since butterfly valves are mostly made of metal, the electrical components are easily damaged after long-term use due to the thermal conductivity of metal. When the motor fails to start, the butterfly valve cannot automatically close according to the pressure, which may cause danger.

[0005] Therefore, the present invention provides a pneumatic butterfly valve for blast furnace gas holders. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: A pneumatic butterfly valve for a blast furnace gas holder, comprising a valve pipe, a transmission box installed at the top of the valve pipe, a valve plate disposed inside the valve pipe, and an overpressure opening device disposed at the top of the valve pipe, the overpressure opening device comprising:

[0008] A power telescopic rod is slidably mounted on the top of the valve pipe, and the power telescopic rod can engage with and drive the valve plate.

[0009] The actuating block is fixedly connected to the power telescopic rod, and actuating inclined blocks are fixedly installed at both the upper and lower ends of the actuating block;

[0010] An overpressure chamber fixedly installed at the top of the valve pipe;

[0011] An overpressure post that is movably inserted into the overpressure chamber;

[0012] A lifting plate fixed to the outer wall of the overpressure column;

[0013] A first limiting plate and a second limiting plate are slidably mounted on the top of the valve pipe. The first limiting plate and the second limiting plate are respectively used to push the upper and lower actuating inclined blocks to move. A lifting plate is located between the first limiting plate and the second limiting plate; and

[0014] Before starting the overpressure spring that resets the first and second limit plates, first close all outlets except the valve plate and the overpressure chamber. Then rotate the valve plate to the open position and introduce medium gas into the valve pipe. The gas inside the valve pipe is under pressure. When it is in a normal stable gas pressure state, the gas pressure inside the valve pipe will pass through the overpressure chamber. An overpressure sliding plate is fixedly installed at the top of the overpressure chamber. The overpressure chamber lifts the overpressure sliding plate, thereby driving the overpressure sliding plate to move upward. The upward movement of the overpressure sliding plate drives the overpressure spring to move upward. The lifting plate, fixedly connected to the outer wall, moves upward. At this time, the lifting plate is located between the first limit plate and the second limit plate. An overpressure support plate is fixedly installed at the bottom of the overpressure spring, and an overpressure support column is fixedly installed on the side wall of the overpressure support plate. If the pressure in the valve pipe is too high, it will drive the lifting plate upward, thereby lifting the first limit plate. The first limit plate drives the first actuating rod, fixedly connected to the side wall, to move upward. Each end of the actuating block is equipped with an actuating inclined block. The upward movement of the first actuating rod lifts the upper actuating inclined block, thereby driving the actuating block and the power telescopic mechanism. The valve tube moves, and a power limiting block is fixedly installed at the top. A power telescopic rod is slidably installed inside the power limiting block, and a power rack is installed at the end of the power telescopic rod. A power helical gear is installed at the lower end of the transmission box, so that the power rack meshes with the power helical gear, thereby driving the power helical gear to rotate. The rotation of the power helical gear drives the valve plate to rotate, thereby closing the valve plate. When the air pressure inside the valve tube is too low, the lifting plate moves down and squeezes the second limiting plate, thereby driving the second limiting plate to move downward. After the second actuating rod, which is fixedly connected to the side wall of the second limiting plate, moves down, it actuates the lower actuating rod. The moving inclined block drives the actuating block and the power telescopic rod to move, thereby driving the power helical gear to rotate. The power helical gear drives the valve plate to the closed state, thus achieving the effect of closing the valve plate according to the air pressure inside the valve pipe when unattended or in a power-off state, protecting the machine and preventing explosions caused by excessive pressure. It can protect the working stability of the butterfly valve after the medium flows through it according to the air pressure, and prevent the valve from being unable to close by current control when the power is off. The lifting plate can automatically close the valve when the pressure is too high or too low, improving the valve's safety.

[0015] Preferably, the length of the overpressure spring exceeds the distance between the two actuating blocks, and the distance between the first limiting plate and the second limiting plate does not exceed the distance between the two actuating blocks. The length of the overpressure spring exceeding the distance between the actuating blocks allows the first limiting plate and the second limiting plate to fully push open the actuating blocks during movement, while the distance between the first limiting plate and the second limiting plate does not exceed the distance between the actuating blocks, preventing the first actuating rod and the second actuating rod from pushing out the distance between the two actuating blocks during movement, thus preventing them from failing to rebound. This serves as a protective device, thereby ensuring the normal operation of the machine.

[0016] Preferably, the outer wall of the valve pipe is provided with a cleaning device, which includes multiple cleaning nozzles fixedly installed on the outer wall of the valve pipe. A second cleaning tube is fixedly installed at the end of each cleaning nozzle and is fixedly connected to the first cleaning tube. When high-pressure gas, much higher than that inside the valve pipe, enters the interior of the first cleaning tube, the gas is transported through the interior of the first cleaning tube to the interior of the two second cleaning tubes. The gas then enters the interior of the cleaning nozzles through the second cleaning tubes, thereby cleaning the interior of the valve pipe and the outer wall of the cleaning nozzles. Under the action of the strong airflow, dust adhering to the surface of the valve plate and valve pipe is blown out and discharged along the valve pipe. This device is beneficial for cleaning dust adhering to the interior of the valve pipe and the outer wall of the valve plate, thereby protecting the smooth opening and closing of the valve plate and extending its service life.

[0017] Preferably, an overpressure support column is fixedly installed at the top of the valve pipe, and a cleaning triggering device is fixedly installed at the top of the overpressure support column. The cleaning triggering device includes a pressure box fixedly installed at the top of the overpressure support column, a pressure outlet pipe fixedly installed on the side wall of the pressure box, a pressure sealing column rolled inside the pressure outlet pipe, a rebound plate fixedly installed on the outer wall of the pressure sealing column, a first spring fixedly installed on the inner wall of the rebound plate, and a pressure inlet provided on the side wall of the pressure box, which can engage with the pressure sealing column.

[0018] Preferably, a pressure inlet is fixedly installed at the top of the pressure box, an air intake regulating plate is rolled inside the pressure inlet, an adjusting cylinder is fixedly installed on the side wall of the air intake regulating plate, a lifting rod is rolledly installed on the side wall of the adjusting cylinder, a pressure cylinder is fixedly installed at the top of the pressure box, a pressure lifting column is slidably installed inside the pressure cylinder, a pressure lifting column is fixedly installed inside the pressure lifting column, and the lifting rod is slidably installed at the lower end of the pressure lifting column.

[0019] Preferably, the valve pipe is provided with an airtightness detection device on its side wall. The airtightness detection device includes a telescopic cavity fixedly installed on the side wall of the valve pipe. An airtight telescopic column is slidably installed inside the telescopic cavity. An airtight fixing plate is fixedly installed on the side wall of the airtight telescopic column. A first rotating spring column is fixedly installed at both ends of the airtight fixing plate. A second rotating plate is fixedly installed on the outer wall of the first rotating spring column.

[0020] Preferably, a second rotating spring column is fixedly installed inside the valve tube, and an opening plate is fixedly installed on the outer wall of the second rotating spring column. The opening plate on the outer wall of the valve tube can close the inner wall of the valve tube, preventing dust and high-temperature gas from contaminating the parts inside the telescopic cavity during use. At the same time, it can keep the valve tube in a sealed state during use, improving the accuracy of detection.

[0021] Preferably, a pressure limiting port is fixedly installed at the top of the pressure box, a pressure limiting bead is provided at the top of the pressure limiting port, an air outlet hollow column is fixedly installed at the top of the pressure limiting port, a second spring is provided inside the air outlet hollow column, a hollow column top plate is fixedly installed at the top of the second spring, and the outer wall of the hollow column top plate is fixedly installed at the top of the inner wall of the air outlet hollow column.

[0022] Preferably, a valve plate is rolled inside the valve tube, located at the center of the valve tube. The cleaning nozzle is located on the outer diameter away from the valve plate, and the opening plate is located on the outer diameter away from the cleaning nozzle. The position of the cleaning nozzle is larger than the diameter of the valve plate, which can prevent the valve plate from touching the recessed outer wall of the cleaning nozzle when the valve plate rotates, reducing wear and thus improving service life. The opening plate is located on the outer diameter away from the cleaning nozzle, which can prevent the parts inside the telescopic cavity from touching the recessed inner wall of the cleaning nozzle when they slide inward, thus protecting the stability and fit of the parts during operation.

[0023] Preferably, two measuring chambers are fixedly installed on the side wall of the valve tube. A measuring top plate is slidably installed inside the measuring chamber, and a measuring column is fixedly installed on the side wall of the measuring top plate. When air tightness needs to be tested, because the measuring chamber is closer to the inside of the valve plate than the telescopic chamber, when the parts inside the telescopic chamber are inserted into the inside of the valve tube, the valve plate is rotated so that both ends of the valve tube are closed. Then, pressure is applied to either end of the closed end, and the pressure inside the valve tube increases, thereby lifting the measuring top plate through the measuring chamber. The measuring top plate moves along the inner wall of the measuring chamber, thereby driving the measuring column to move outward. Therefore, the extension length of the measuring column can be compared, and the extension length on both sides can be observed to determine whether there is an air leakage.

[0024] The beneficial effects of this invention are as follows:

[0025] 1. The pneumatic butterfly valve for a blast furnace gas holder described in this invention can protect the working stability of the butterfly valve after the medium flows through it by means of an overpressure opening device, which can be adjusted according to the gas pressure. This prevents the valve from being unable to close by current control when the power is cut off. The lifting plate can automatically close the valve when the pressure is too high or too low, thereby improving the safety of the valve.

[0026] 2. The pneumatic butterfly valve for blast furnace gas holder described in this invention uses an airtightness detection device to detect the airtightness of the valve. When the valve is used repeatedly, wear will occur, causing gas to continue to flow even after the valve is closed. This device can improve the safety of the valve.

[0027] 3. The pneumatic butterfly valve for a blast furnace gas holder described in this invention uses a cleaning device to clean the valve and the valve pipes around the valve with airflow. Because dust may be present when the valve passes through the medium, making it impossible to completely close the valve, this device improves the cleanliness of the valve and extends its service life. Attached Figure Description

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] Figure 1 This is an overall appearance drawing of the present invention;

[0030] Figure 2 This is a structural diagram of the overpressure opening device of the present invention;

[0031] Figure 3 This is a partial view of the overpressure opening device of the present invention;

[0032] Figure 4 This is a diagram of the cleaning triggering device of the present invention;

[0033] Figure 5 This is a structural diagram of the cleaning device of the present invention;

[0034] Figure 6 This is a structural diagram of the airtightness detection device of the present invention;

[0035] Figure 7 This is an internal structural diagram of the airtightness testing device of the present invention;

[0036] Figure 8 This is a cross-sectional view of the overall structure of the airtightness detection device of the present invention;

[0037] Figure 9 This is a side view of the overall structure of the invention;

[0038] In the picture:

[0039] 1. Valve pipe; 11. Transmission box; 12. Cylinder; 13. Valve plate; 14. Measuring chamber; 15. Measuring column; 151. Measuring top plate;

[0040] 2. Overpressure opening device; 21. Overpressure column; 22. First limiting plate; 221. First actuating rod; 23. Lifting plate; 24. Second limiting plate; 241. Second actuating rod; 25. Overpressure sliding plate; 26. Overpressure cavity; 27. Overpressure spring; 271. Overpressure support plate; 272. Overpressure support column; 28. Power limiting block; 281. Power telescopic rod; 282. Power rack; 283. Power helical gear; 29. ​​Actuating block; 291. Actuating helical block;

[0041] 4. Cleaning device; 41. First cleaning tube; 42. Second cleaning tube; 43. Cleaning nozzle;

[0042] 5. Cleaning trigger device; 51. Pressure box; 52. Pressure outlet pipe; 521. Pressure sealing column; 522. Rebound plate; 523. First spring; 53. Pressure inlet; 531. Inlet regulating plate; 532. Adjusting cylinder; 533. Lifting rod; 534. Pressure cylinder; 535. Pressure lifting column; 536. Pressure jacking column; 54. Pressure limiting port; 541. Pressure limiting bead; 542. Hollow outlet column; 543. Second spring; 544. Hollow column top plate;

[0043] 6. Air tightness detection device; 61. Air tightness telescopic column; 62. Telescopic cavity; 63. First rotating plate; 64. Air tightness fixing plate; 65. Second rotating plate; 66. Door opening plate; 67. First rotating spring column; 68. Second rotating spring column. Detailed Implementation

[0044] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0045] Example 1

[0046] like Figure 1-3 As shown in the embodiment of the present invention, a pneumatic butterfly valve for a blast furnace gas holder includes a valve pipe 1, a transmission box 11 installed at the top of the valve pipe 1, a valve plate 13 disposed inside the valve pipe 1, and an overpressure opening device 2 disposed at the top of the valve pipe 1. The overpressure opening device 2 includes:

[0047] A power telescopic rod 281 is slidably mounted on the top of valve pipe 1. The power telescopic rod 281 can engage with and drive the valve plate 13.

[0048] A toggle block 29 is fixedly connected to the power telescopic rod 281, and toggle blocks 291 are fixedly installed at both the upper and lower ends of the toggle block 29.

[0049] Overpressure chamber 26 is fixedly installed at the top of valve pipe 1;

[0050] The overpressure column 21 is movably inserted into the overpressure cavity 26;

[0051] The lifting plate 23 is fixed to the outer wall of the overpressure column 21;

[0052] A first limiting plate 22 and a second limiting plate 24 are slidably mounted on the top end of valve pipe 1. The first limiting plate 22 and the second limiting plate 24 are respectively used to push the upper and lower actuating inclined blocks 291 to move. A lifting plate 23 is located between the first limiting plate 22 and the second limiting plate 24; and

[0053] Overpressure spring 27 resets the first limiting plate 22 and the second limiting plate 24.

[0054] Specifically, in 200,000 m3 Add a pneumatic valve at the blast furnace inlet and outlet when the gas holder capacity exceeds 180,000 m³. 3 or less than 30,000 m 3 The valve automatically interlocks and closes. Before starting, first close all outlets except valve plate 13 and overpressure chamber 26. Then rotate valve plate 13 to the open position, and then introduce medium gas into valve pipe 1. The gas inside valve pipe 1 is under pressure. When it is in a normal stable gas pressure state, the gas pressure inside valve pipe 1 will pass through overpressure chamber 26. Overpressure sliding plate 25 is fixedly installed at the top of overpressure chamber 26. Overpressure chamber 26 lifts overpressure sliding plate 25, thereby driving overpressure sliding plate 25 to move upward. The upward movement of overpressure sliding plate 25 drives overpressure column 21 to move upward. The upward movement of overpressure column 21 drives lifting plate 23 fixedly connected to the outer wall to move upward. At this time, the top... The lifting plate 23 is located between the first limiting plate 22 and the second limiting plate 24. An overpressure support plate 271 is fixedly installed at the bottom of the overpressure spring 27, and an overpressure support column 272 is fixedly installed on the side wall of the overpressure support plate 271. If the pressure inside the valve pipe 1 is too high, it will cause the lifting plate 23 to move upwards, thereby lifting the first limiting plate 22. The first limiting plate 22 will cause the first actuating rod 221, fixedly connected to the side wall, to move upwards. Actuating inclined blocks 291 are installed at the ends of the actuating blocks 29. The upward movement of the first actuating rod 221 lifts the upper actuating inclined blocks 291, thereby causing the actuating blocks 29 and the power telescopic rod 281 to move. The top of the valve pipe 1... A power limiting block 28 is fixedly installed at one end, and a power telescopic rod 281 is slidably installed inside the power limiting block 28. A power rack 282 is installed at the end of the power telescopic rod 281, and a power helical gear 283 is installed at the lower end of the transmission box 11, so that the power rack 282 meshes with the power helical gear 283, thereby driving the power helical gear 283 to rotate. The rotation of the power helical gear 283 drives the valve plate 13 to rotate, thereby closing the valve plate 13. When the air pressure inside the valve pipe 1 is too low, the lifting plate 23 moves down and squeezes the second limiting plate 24, thereby driving the second limiting plate 24 to move downward. A second actuating rod 241 is fixedly connected to the side wall of the second limiting plate 24. After being moved down, the lower actuating block 291 is moved, which drives the actuating block 29 and the power telescopic rod 281 to move, thereby driving the power helical gear 283 to rotate. The power helical gear 283 drives the valve plate 13 to be in a closed state. This completes the function of closing the valve plate 13 according to the air pressure inside the valve pipe 1 when unattended or in a power-off state, thus protecting the machine and preventing explosions caused by excessive pressure. It can protect the working stability of the butterfly valve after the medium flows through it according to the air pressure, and prevent the valve from being unable to be closed by current control when the power is off. The lifting plate 23 can automatically close the valve when the pressure is too high or too low, improving the safety of the valve.

[0055] like Figure 1-3As shown, the length of the overpressure spring 27 exceeds the distance between the two actuating blocks 291, and the distance between the first limiting plate 22 and the second limiting plate 24 does not exceed the distance between the two actuating blocks 291.

[0056] Specifically, the length of the overpressure spring 27 exceeds the distance of the actuating inclined block 291, allowing the first limiting plate 22 and the second limiting plate 24 to fully push open the actuating block 29 during movement. The distance between the first limiting plate 22 and the second limiting plate 24 does not exceed the distance of the actuating inclined block 291, ensuring that the first actuating rod 221 and the second actuating rod 241 do not push out the distance of the two actuating inclined blocks 291 during movement, thus preventing them from failing to rebound. This serves as a protective device, thereby ensuring the normal operation of the machine.

[0057] like Figure 5 As shown, a cleaning device 4 is provided on the outer wall of the valve pipe 1. The cleaning device 4 includes a plurality of cleaning nozzles 43 fixedly installed on the outer wall of the valve pipe 1. A second cleaning pipe 42 is fixedly installed at the end of the cleaning nozzle 43. The second cleaning pipe 42 is fixedly connected to the first cleaning pipe 41.

[0058] Specifically, when high-pressure gas, much higher than that inside valve tube 1, enters the first cleaning tube 41, the gas is transported through the first cleaning tube 41 to the two second cleaning tubes 42. The gas then enters the cleaning nozzle 43 through the second cleaning tubes 42, thereby cleaning the inside of valve tube 1 and the outer wall of the cleaning nozzle 43. Under the action of the strong airflow, the dust adhering to the surface of valve plate 13 and valve tube 1 is blown out and discharged along the valve tube 1. This device is beneficial for cleaning the dust adhering to the inside of valve tube 1 and the outer wall of valve plate 13, thereby protecting the smooth opening and closing of valve plate 13 and extending its service life.

[0059] like Figure 4 As shown, an overpressure support plate 271 is fixedly installed at the top of the valve pipe 1. A cleaning trigger device 5 is fixedly installed at the top of the overpressure support plate 271. The cleaning trigger device 5 includes a pressure box 51 fixedly installed at the top of the overpressure support column 272. A pressure outlet pipe 52 is fixedly installed on the side wall of the pressure box 51. A pressure sealing column 521 is rolled inside the pressure outlet pipe 52. A rebound plate 522 is fixedly installed on the outer wall of the pressure sealing column 521. A first spring 523 is fixedly installed on the inner wall of the rebound plate 522. A pressure inlet 53 is provided on the side wall of the pressure box 51. The pressure inlet 53 can engage with the pressure sealing column 521.

[0060] Specifically, when the pressure chamber 51 is filled with high-pressure gas, triggering the release of the gas requires either the first limiting plate 22 or the second limiting plate 24 to be lifted. At this time, the valve plate 13 is perpendicular to the valve pipe 1, so that the valve pipe 1 is in a closed state. The pressure sealing column 521, which is slidably connected inside the pressure outlet pipe 52, is no longer held in place. Under the action of air pressure, the rebound plate 522 is pushed outward. Then, the gas inside the pressure chamber 51 is ejected from either pressure inlet 53, and then enters the interior of the first cleaning pipe 41 through the pressure outlet pipe 52, thereby cleaning the interior of the valve pipe 1 and the outer wall of the valve plate 13. After the high-pressure gas is ejected, the pressure sealing column 521 will rebound under the action of the first spring 523, so that the rebound plate 522 blocks the opening of the pressure inlet 53, making the pressure inlet 53 closed. This device can clean the valve plate 13 and the valve pipe 1 while the valve plate 13 closes the passage of the valve pipe 1.

[0061] like Figure 4 As shown, a pressure inlet 53 is fixedly installed at the top of the pressure box 51. An air intake regulating plate 531 is rolled inside the pressure inlet 53. An adjusting cylinder 532 is fixedly installed on the side wall of the air intake regulating plate 531. A lifting rod 533 is rolled on the side wall of the adjusting cylinder 532. A pressure cylinder 534 is fixedly installed at the top of the pressure box 51. A pressure lifting column 536 is slidably installed inside the pressure cylinder 534. A pressure lifting column 535 is fixedly installed inside the pressure lifting column 536. The lifting rod 533 is slidably installed at the lower end of the pressure lifting column 535.

[0062] Specifically, when the pressure box 51 needs to be inflated, the port at the end of the cylinder 12 is connected to the pressure inlet 53. Gas is then introduced into the pressure inlet 53. When the pressure box 51 is inflated, the pressure cylinder 534 is pressurized and pushes up the pressure lifting column 536, causing the pressure lifting column 536 to move upward. The upward movement of the pressure lifting column 536 drives the pressure lifting column 535 to move upward. The upward movement of the pressure lifting column 535 pulls the lifting rod 533 upward, thereby pulling the adjusting cylinder 532 to rotate. The rotation of the adjusting cylinder 532 causes the air intake adjusting plate 531 to rotate. The rotation of the air intake adjusting plate 531 closes the gas entering the cylinder 12, completing the filling of the gas and thus inflating the pressure box 51 in preparation for the next cleaning of the valve plate 13 and valve pipe 1.

[0063] like Figure 6-7As shown, an airtightness detection device 6 is provided on the side wall of the valve pipe 1. The airtightness detection device 6 includes a telescopic cavity 62 fixedly installed on the side wall of the valve pipe 1. An airtight telescopic column 61 is slidably installed inside the telescopic cavity 62. An airtight fixing plate 64 is fixedly installed on the side wall of the airtight telescopic column 61. A first rotating spring column 67 is fixedly installed at both ends of the airtight fixing plate 64. A second rotating plate 65 is fixedly installed on the outer wall of the first rotating spring column 67.

[0064] Specifically, when it is necessary to test the airtightness, first rotate the valve plate 13 so that both ends of the valve tube 1 are in a closed state. Then press the airtight telescopic column 61 to move the airtight telescopic column 61 into the valve tube 1. When the airtight telescopic column 61 moves, it drives the airtight fixing plate 64, the first rotating plate 63, the first rotating spring column 67 and the second rotating plate 65 to move inward. Under the action of the first rotating spring column 67, the second rotating plate 65 and the first rotating plate 63 are driven to unfold, thereby closing the opening of the valve tube 1. Then, observe the air pressure change at both ends of the valve tube 1 to determine whether the valve plate 13 will leak air and the sealing status.

[0065] like Figure 6-8 As shown, a second rotating spring column 68 is fixedly installed inside the valve pipe 1, and an opening plate 66 is fixedly installed on the outer wall of the second rotating spring column 68.

[0066] Specifically, the valve tube 1 is provided with an opening plate 66 on its outer wall, which can close the inner wall of the valve tube 1 to prevent dust and high-temperature gas from contaminating the parts inside the telescopic cavity 62 during use. At the same time, it can keep the valve tube 1 in a sealed state during use, thereby improving the accuracy of detection.

[0067] like Figure 4 As shown, a pressure limiting port 54 is fixedly installed at the top of the pressure box 51. A pressure limiting bead 541 is provided at the top of the pressure limiting port 54. An air outlet hollow column 542 is fixedly installed at the top of the pressure limiting port 54. A second spring 543 is provided inside the air outlet hollow column 542. A hollow column top plate 544 is fixedly installed at the top of the second spring 543. The outer wall of the hollow column top plate 544 is fixedly installed at the top of the inner wall of the air outlet hollow column 542.

[0068] Specifically, when the pressure box 51 is pressurized, if the parts of the pressure lifting column 536 malfunction or the rotation effect is not good, the air pressure inside the pressure box 51 can be ejected through the pressure limiting port 54. The hollow column top plate 544 is installed on the top of the air outlet hollow column 542, and the pressure limiting bead 541 at the bottom of the second spring 543 can block the opening of the pressure limiting port 54. When the air pressure inside the pressure box 51 is too high, the pressure limiting bead 541 can be lifted through the pressure limiting port 54 to release the gas. Then the gas is ejected from the middle of the hollow column top plate 544.

[0069] like Figure 8 As shown, a valve plate 13 is rolled inside the valve tube 1. The valve plate 13 is located at the center inside the valve tube 1. The cleaning nozzle 43 is located on the outer diameter away from the valve plate 13. The door opening plate 66 is located on the outer side away from the cleaning nozzle 43.

[0070] Specifically, the position of the cleaning nozzle 43 is larger than the diameter of the valve plate 13, which can prevent the valve plate 13 from touching the recessed outer wall of the cleaning nozzle 43 when the valve plate 13 rotates, reducing wear and thus improving service life. The door plate 66 is located on the outside away from the cleaning nozzle 43, so that the parts inside the telescopic cavity 62 will not touch the recessed inner wall of the cleaning nozzle 43 when they slide inward, thus protecting the stability and fit of the parts during operation.

[0071] like Figure 9 As shown, two measuring chambers 14 are fixedly installed on the side wall of the valve pipe 1. A measuring top plate 151 is slidably installed inside the measuring chamber 14, and a measuring column 15 is fixedly installed on the side wall of the measuring top plate 151.

[0072] Specifically, when airtightness testing is required, because the measuring chamber 14 is closer to the inside of the valve plate 13 than the telescopic chamber 62, when the parts inside the telescopic chamber 62 are inserted into the valve tube 1, the valve plate 13 is rotated so that both ends of the valve tube 1 are closed. Then, pressure is applied to either of the closed ends, increasing the pressure inside the valve tube 1, which in turn pushes up the measuring top plate 151 through the measuring chamber 14. The measuring top plate 151 moves along the inner wall of the measuring chamber 14, thereby driving the measuring column 15 to move outward. Therefore, the extension length of the measuring column 15 can be compared, and the extension lengths on both sides can be observed to determine whether there is an air leak.

[0073] Working principle: When both ends of valve pipe 1 are working normally, both ends are open, valve plate 13 is open, and door plate 66 is closed. At this time, the lifting plate 23 is within the normal range and will not touch the first limit plate 22 and the second limit plate 24. As the internal pressure of valve pipe 1 increases, the overpressure sliding plate 25 moves upward along the inside of the overpressure cavity 26 under the pressure of valve pipe 1. When the internal pressure of valve pipe 1 exceeds the normal pressure, the lifting plate 23 will lift the first limit plate 22, and the first actuating rod 221 on the side wall of the first limit plate 22 will lift the actuating block 291, thereby driving the actuating block 29 to move to the side. The actuating block 29 is fixedly connected to the end of the power telescopic rod 281, and the power telescopic rod 281 is also fixedly connected to the end of the power telescopic rod 281. The other end of rod 281 is fixedly connected to power rack 282, thereby driving power rack 282 to move to the side. When power rack 282 moves, it meshes with power helical gear 283. Power helical gear 283 drives valve plate 13 to rotate, rotating valve plate 13 to a state that fits against the inner wall of valve pipe 1, thus completely closing both ends of valve pipe 1. At this time, when the first limiting plate 22 and the second limiting plate 24 move to both sides, the first limiting plate 22 and the second limiting plate 24 no longer press the air pressure sealing column 521 on the inner wall of air pressure outlet pipe 52. The air pressure sealing column 521 at the upper end of air pressure outlet pipe 52 is pushed outward by the pressure inside air pressure box 51, so that air pressure comes out from the position of air pressure inlet 53 and enters from the top of air pressure outlet pipe 52 along the first cleaning pipe 41. Multiple cleaning nozzles 43 are inserted into the outer wall of valve tube 1 to blow and clean the inner wall of valve tube 1 and the outer wall of valve plate 13 until the air pressure inside the air pressure box 51 is completely released. Then, the first spring 523 will keep the air pressure sealing column 521 aligned with the air pressure inlet 53, thereby blocking the air pressure inlet 53 and completing the function of cleaning the inner wall of valve tube 1 and the outer wall of valve plate 13. If the air pressure is too low, the lifting plate 23 will press against the second limiting plate 24, thereby pressing the second limiting plate 24 to the lower end. The second limiting plate 24 will press against the actuating inclined block 291. The actuating inclined block 291 moves to the side, causing the actuating block 29 to move to the side. Then, as described above, the valve plate 13 will be closed. When the valve plate 13 is closed, the second limiting plate 24 will disengage from the air pressure outlet pipe 52. The air pressure sealing column 521 at the bottom releases the gas inside the pressure box 51. When both sides of the valve pipe 1 are completely closed, any airtight telescopic column 61 inside the telescopic cavity 62 at the upper end of the valve pipe 1 can be pressed. The airtight telescopic column 61, under pressure, drives the second rotating plate 65, the airtight fixed plate 64, and the first rotating plate 63 to move inward. When the airtight fixed plate 64 has completely moved into the valve pipe 1, the second rotating plate 65 and the first rotating plate 63 are fully opened under the action of the first rotating spring column 67, so that part of the space on both sides of the valve plate 13 is in a completely closed state. Then, pressure is applied to the other end, and the protrusion of the measuring column 15 on the outer wall of the valve pipe 1 is observed to determine whether the valve plate 13 is leaking. If only one side changes, the airtightness is good.If the pressure changes on both sides, the sealing of valve plate 13 needs to be repaired, thus completing the airtightness test. This allows the valve to maintain operational stability after the medium flows through it, based on the air pressure. It also prevents the valve from failing to close due to power failure, as the lifting plate 23 can automatically close the valve when the pressure is too high or too low, improving valve safety.

[0074] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pneumatic butterfly valve for a blast furnace gas holder, comprising a valve pipe (1), characterized in that: A transmission box (11) is installed at the top of the valve pipe (1), and a valve plate (13) is provided inside the valve pipe (1). An overpressure opening device (2) is provided at the top of the valve pipe (1). The overpressure opening device (2) includes: A power telescopic rod (281) is slidably mounted on the top of the valve tube (1), and the power telescopic rod (281) can engage with the valve plate (13) for transmission; A toggle block (29) is fixedly connected to the power telescopic rod (281), and toggle blocks (291) are fixedly installed at both the upper and lower ends of the toggle block (29). Overpressure chamber (26) is fixedly installed at the top of valve pipe (1); An overpressure column (21) is movably inserted into the overpressure cavity (26); The lifting plate (23) is fixed to the outer wall of the overpressure column (21); A first limiting plate (22) and a second limiting plate (24) are slidably installed at the top of the valve pipe (1). The first limiting plate (22) and the second limiting plate (24) are respectively used to push the upper and lower two actuating inclined blocks (291) to move. The lifting plate (23) is located between the first limiting plate (22) and the second limiting plate (24); and Overpressure spring (27) for resetting the first limiting plate (22) and the second limiting plate (24); The outer wall of the valve tube (1) is provided with a cleaning device (4). The cleaning device (4) includes a plurality of cleaning nozzles (43) fixedly installed on the outer wall of the valve tube (1). A second cleaning tube (42) is fixedly installed at the end of the cleaning nozzle (43). The second cleaning tube (42) is fixedly connected to the first cleaning tube (41). An overpressure support plate (271) is fixedly installed at the top of the valve pipe (1). A cleaning trigger device (5) is fixedly installed at the top of the overpressure support plate (271). The cleaning trigger device (5) includes a pressure box (51) fixedly installed at the top of the overpressure support column (272). A pressure outlet pipe (52) is fixedly installed on the side wall of the pressure box (51). A pressure sealing column (521) is rolled inside the pressure outlet pipe (52). A rebound plate (522) is fixedly installed on the outer wall of the pressure sealing column (521). A first spring (523) is fixedly installed on the inner wall of the rebound plate (522). A pressure inlet (53) is provided on the side wall of the pressure box (51). The pressure inlet (53) can engage with the pressure sealing column (521). When the pressure inside the valve tube (1) exceeds the normal pressure, the first limiting plate (22) moves upward or the second limiting plate (24) moves downward. The first limiting plate (22) or the second limiting plate (24) will no longer press the air pressure sealing column (521) on the inner wall of the air pressure outlet pipe (52). Gas enters from the top of the air pressure outlet pipe (52) along the first cleaning pipe (41) into the multiple cleaning nozzles (43) on the outer wall of the valve tube (1).

2. The pneumatic butterfly valve for blast furnace gas holders according to claim 1, characterized in that: The length of the overpressure spring (27) exceeds the distance between the two actuating blocks (291), and the distance between the first limiting plate (22) and the second limiting plate (24) does not exceed the distance between the two actuating blocks (291).

3. The pneumatic butterfly valve for blast furnace gas holders according to claim 1, characterized in that: A pressure inlet (53) is fixedly installed at the top of the pressure box (51). An air intake regulating plate (531) is rolled inside the pressure inlet (53). An adjusting cylinder (532) is fixedly installed on the side wall of the air intake regulating plate (531). A lifting rod (533) is rolled on the side wall of the adjusting cylinder (532). A pressure cylinder (534) is fixedly installed at the top of the pressure box (51). A pressure lifting column (536) is slidably installed inside the pressure cylinder (534). A pressure lifting column (535) is fixedly installed inside the pressure lifting column (536). The lifting rod (533) is slidably installed at the lower end of the pressure lifting column (535).

4. The pneumatic butterfly valve for blast furnace gas holders according to claim 3, characterized in that: The valve tube (1) is provided with an airtightness detection device (6) on its side wall. The airtightness detection device (6) includes a telescopic cavity (62) fixedly installed on the side wall of the valve tube (1). An airtight telescopic column (61) is slidably installed inside the telescopic cavity (62). An airtight fixing plate (64) is fixedly installed on the side wall of the airtight telescopic column (61). A first rotating spring column (67) is fixedly installed at both ends of the airtight fixing plate (64). A second rotating plate (65) is fixedly installed on the outer wall of the first rotating spring column (67).

5. The pneumatic butterfly valve for blast furnace gas holders according to claim 4, characterized in that: A second rotating spring column (68) is fixedly installed inside the valve pipe (1), and an opening plate (66) is fixedly installed on the outer wall of the second rotating spring column (68).

6. The pneumatic butterfly valve for blast furnace gas holders according to claim 4, characterized in that: The pressure box (51) is fixedly installed with a pressure limiting port (54) at the top. The pressure limiting port (54) is provided with a pressure limiting bead (541) at the top. The pressure limiting port (54) is fixedly installed with a hollow air outlet column (542) at the top. The hollow air outlet column (542) is provided with a second spring (543) inside. The top of the second spring (543) is fixedly installed with a hollow column top plate (544). The outer wall of the hollow column top plate (544) is fixedly installed on the top of the inner wall of the hollow air outlet column (542).

7. The pneumatic butterfly valve for blast furnace gas holders according to claim 5, characterized in that: A valve plate (13) is rolled inside the valve tube (1). The valve plate (13) is located at the center inside the valve tube (1). The cleaning nozzle (43) is located on the outer diameter away from the valve plate (13). The door opening plate (66) is located on the outer side away from the cleaning nozzle (43).

8. The pneumatic butterfly valve for blast furnace gas holders according to claim 1, characterized in that: Two measuring chambers (14) are fixedly installed on the side wall of the valve tube (1). A measuring top plate (151) is slidably installed inside the measuring chamber (14). A measuring column (15) is fixedly installed on the side wall of the measuring top plate (151).

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