Opening and closing valve for smoke exhaust pipeline of submerged arc furnace

Abstract

The utility model relates to an on-off valve for a submerged arc furnace smoke exhaust pipeline, which comprises a valve body and a valve plate, the smoke exhaust pipeline comprises two unit pipelines, the two unit pipelines are respectively connected with a smoke collecting hood and an air pump, the valve body is tubular and is arranged between the two unit pipelines, and two ends of the valve body are connected with the corresponding unit pipelines through flanges. The valve plate is rotationally connected into the valve body through a rotating shaft, the two ends of the rotating shaft penetrate out of the valve body, and a driving assembly for driving the rotating shaft to rotate is arranged on the valve body. The driving assembly comprises a pneumatic motor, and the pneumatic motor drives the rotating shaft to rotate through the synchronous assembly. The opening and closing valve has the effects of reducing the labor intensity of workers and improving the opening and closing efficiency of the opening and closing valve.

Description

Technical Field

[0001] The utility model relates to the technical field of submerged arc furnaces, in particular to an on-off valve for a smoke exhaust pipe of a submerged arc furnace. Background Art

[0002] The submerged arc furnace, also known as the electric arc furnace, is mainly used for reducing and smelting ores. A smoke hood is provided on the submerged arc furnace, and a smoke exhaust passage is connected to the smoke hood. An air pump is connected to the end of the smoke exhaust passage away from the smoke hood. The air pump draws the smoke out of the furnace body. An opening and closing valve for controlling the exhaust of smoke is provided on the smoke exhaust passage.

[0003] The opening and closing valve includes a tubular valve body connected to the pipeline, in which a valve plate is rotatably arranged. During the smelting process of the electric arc furnace, the valve plate and the valve body are in a closed state. When iron is being tapped, there is an opening between the valve plate and the valve body to allow smoke to be discharged.

[0004] The valve plate is rotatably connected to the valve body through a rotating shaft. One end of the rotating shaft extends out of the valve body and is rotatably connected to the valve body through a bearing. The other end of the rotating shaft extends out of the valve body and is connected to a butterfly handle. The staff drives the valve plate to rotate by rotating the butterfly handle. The labor intensity of the staff is high, and the speed of manually rotating the valve plate is slow, which affects the efficiency of smoke exhaust. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides an on-off valve for an electric arc furnace exhaust pipe.

[0006] The on-off valve for the exhaust pipe of the submerged arc furnace provided in this application adopts the following technical solution:

[0007] An on-off valve for a smoke exhaust pipe of an electric arc furnace comprises a valve body and a valve plate. The smoke exhaust pipe comprises two unit pipes, the two unit pipes are respectively connected to a smoke collecting hood and an air pump, the valve body is tubular and arranged between the two unit pipes, the two ends of the valve body are connected to the corresponding unit pipes through flanges, the valve plate is rotatably connected to the valve body through a rotating shaft, the two ends of the rotating shaft pass through the outside of the valve body, and a driving component for driving the rotating shaft to rotate is arranged on the valve body;

[0008] The driving assembly includes a pneumatic motor, and the pneumatic motor drives the rotating shaft to rotate through a synchronous assembly.

[0009] Preferably, the synchronization component includes a driving sprocket, a driven sprocket and a synchronization chain. The output shaft of the pneumatic motor is coaxially connected to the driving sprocket through a reducer. The driven sprocket is sleeved on the end of the rotating shaft extending out of the valve body. The synchronization sprocket is also sleeved on the driving sprocket and the driven sprocket, and the synchronization sprocket is meshed with the driving sprocket and the driven sprocket at the same time.

[0010] Preferably, a first limit plate and a second limit plate are fixedly connected to the inner wall of the valve body, the first limit plate and the second limit plate are located on both sides in the thickness direction of the valve plate, and the first limit plate and the second limit plate are also located on both sides in the width direction of the valve plate, the first limit plate is fixedly connected to the inner top wall of the valve body, and the second limit plate is fixedly connected to the inner bottom wall of the valve body, the first limit plate is located on the side close to the smoke hood, and the second limit plate is located on the side away from the smoke hood, the valve plate can be rotated to abut against the first limit plate and the second limit plate at the same time, and the valve plate can also be rotated to simultaneously disengage from the first limit plate and the second limit plate.

[0011] Preferably, both ends of the first limiting plate in the length direction are connected to a first auxiliary plate, the end of the first auxiliary plate away from the first limiting plate extends close to the rotation axis, and the side wall of the first auxiliary plate is fixedly connected to the inner side walls of the two ends of the valve body in the length direction; both ends of the second limiting plate in the length direction are connected to a second auxiliary plate, the side wall of the second auxiliary plate is fixedly connected to the inner side walls of the two ends of the valve body in the length direction, and the end of the second auxiliary plate away from the second limiting plate extends close to the rotation axis;

[0012] The valve plate can be rotated to abut against the first auxiliary plate and the second auxiliary plate at the same time, and the valve plate can also be rotated to be separated from the first auxiliary plate and the second auxiliary plate at the same time.

[0013] Preferably, a first sealing groove is provided on a surface of the first limiting plate and the first auxiliary plate close to the valve plate, a first sealing strip is embedded in the first sealing groove, the thickness of the first sealing strip is greater than the depth of the first sealing groove, a first matching groove corresponding to the first sealing groove is provided on a surface of the valve plate close to the first sealing groove, a portion of the first sealing strip located outside the first sealing groove penetrates into the first matching groove, and the first sealing strip is interference-fitted with the first sealing groove and the first matching groove at the same time;

[0014] A second sealing groove is provided on one side of the second limiting plate and the second auxiliary plate close to the valve plate, a second sealing strip is embedded in the second sealing groove, the thickness of the second sealing strip is greater than the depth of the second sealing groove, a second matching groove corresponding to the second sealing groove is provided on one side of the valve plate close to the second sealing groove, a portion of the second sealing strip located outside the second sealing groove penetrates into the second matching groove, and the second sealing strip is interference-fitted with the second sealing groove and the second matching groove at the same time;

[0015] One end of the first sealing strip located outside the first sealing groove is arranged in an arc shape, and one end of the second sealing strip located outside the second sealing groove is arranged in an arc shape.

[0016] Preferably, bearings are provided at both ends of the rotating shaft extending out of the valve body, and the fixing ring of the bearing is connected to the outer side wall of the valve body through a sealing ring plate, and the sealing ring plate is connected to the valve body through mounting bolts.

[0017] Preferably, a sealing ring groove is provided on one side of the sealing ring plate that is in contact with the valve body, a sealing ring is embedded in the sealing ring groove, and the sealing ring is interference fit with the inner wall of the sealing ring groove and the valve body.

[0018] Preferably, the valve plate is connected to the rotating shaft via a connecting assembly, and a plurality of connecting assemblies are arranged at intervals along the axial direction of the rotating shaft;

[0019] The connecting assembly comprises a connecting bolt and a connecting nut. The connecting bolt passes through the valve plate and the rotating shaft in sequence and is threadedly connected with the connecting nut.

[0020] Preferably, a reinforcing rib plate is fixedly connected to the rotating shaft, a plurality of reinforcing rib plates are arranged at intervals along the axial direction of the rotating shaft, and fixing plates are arranged on both sides of the reinforcing rib plate in the thickness direction, and the fixing plates are connected to the valve plate through a fixing assembly;

[0021] The fixing assembly comprises a fixing bolt and a fixing nut. The fixing bolt passes through the valve plate and the fixing plate in sequence and is threadedly connected with the fixing nut.

[0022] Preferably, a lever arm plate is connected to one end of the rotating shaft passing through the valve plate, and the lever arm plate and the driving assembly are located on the same side.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. When smoke exhaust is required, start the pneumatic motor, which drives the active sprocket to rotate. The active sprocket drives the driven sprocket to rotate through the same chain, and then drives the rotating shaft to rotate, and drives the valve plate to rotate, thereby automatically realizing the opening and closing of the on-off valve, reducing the labor intensity of the staff and improving the opening and closing efficiency of the on-off valve, so as to quickly provide a channel for the exhaust of smoke;

[0025] 2. The first sealing strip and the second sealing strip improve the sealing between the valve plate and the valve body, reducing the unnecessary discharge of smoke through the valve plate;

[0026] 3. The sealing ring and the sealing ring plate improve the sealing between the bearing and the valve body, and reduce the unnecessary leakage of flue gas through the gap between the rotating shaft and the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the opening and closing valve for the exhaust pipe of the submerged arc furnace in the embodiment of the present application.

[0028] Figure 2It is a schematic diagram of the structure of the reinforcing rib plate used to illustrate the embodiments of the present application.

[0029] Figure 3 It is a schematic diagram of the cross-sectional structure used to show the first sealing strip and the second sealing strip in the embodiment of the present application.

[0030] Figure 4 It is a schematic diagram of the structure of the sealing ring plate and the sealing ring in the embodiment of the present application.

[0031] Explanation of the accompanying drawings: 1. valve body; 11. flange; 2. valve plate; 21. first matching groove; 22. second matching groove; 23. connecting bolt; 24. connecting nut; 3. rotating shaft; 31. reinforcing rib plate; 32. fixing plate; 33. fixing bolt; 34. fixing nut; 4. driving assembly; 41. pneumatic motor; 42. reducer; 5. synchronization assembly; 51. driving sprocket; 52. driven sprocket; 53. synchronization chain; 6. first limiting plate; 61. first auxiliary plate; 62. first sealing groove; 63. first sealing strip; 7. second limiting plate; 71. second auxiliary plate; 72. second sealing groove; 73. second sealing strip; 8. bearing; 81. sealing ring plate; 82. sealing ring groove; 83. sealing ring; 9. lever arm plate. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-4 This application is described in further detail.

[0033] The embodiment of the present application discloses an on-off valve for a smoke exhaust duct of an electric arc furnace.

[0034] Reference Figure 1-4 The on-off valve for the smoke exhaust pipe of the electric arc furnace includes a valve body 1 and a valve plate 2. The smoke exhaust pipe includes two unit pipes, and the two unit pipes are respectively connected to the smoke hood and the air pump. The valve body 1 is tubular and is arranged between the two unit pipes. The two ends of the valve body 1 are connected to the corresponding unit pipes through flanges 11. The valve plate 2 is rotatably connected to the valve body 1 through a rotating shaft 3. The two ends of the rotating shaft 3 pass through the outside of the valve body 1. A driving component 4 for driving the rotating shaft 3 to rotate is arranged on the valve body 1.

[0035] The driving assembly 4 includes an air motor 41, and the air motor 41 drives the rotating shaft 3 to rotate through the synchronization assembly 5. The synchronization assembly 5 includes a driving sprocket 51, a driven sprocket 52 and a synchronization chain 53. The output shaft of the air motor 41 is coaxially connected with the driving sprocket 51 through the reducer 42, and the output shaft of the air motor 41 is connected to the input end of the reducer 42. The output end of the reducer 42 extends out of the transmission shaft, the driving sprocket 51 is sleeved and fixed on the transmission shaft, the driven sprocket 52 is sleeved and fixed on the end of the rotating shaft 3 extending out of the valve body 1, and the synchronization sprocket is sleeved on the driving sprocket 51 and the driven sprocket 52 at the same time, and the synchronization sprocket is meshed with the driving sprocket 51 and the driven sprocket 52 at the same time.

[0036] When smoke exhaust is required, the pneumatic motor 41 is started, and the pneumatic motor 41 drives the active sprocket 51 to rotate. The active sprocket 51 drives the driven sprocket 52 to rotate through the same chain, and then drives the rotating shaft 3 to rotate, and drives the valve plate 2 to rotate, thereby automatically realizing the opening and closing of the opening and closing valve, reducing the labor intensity of the staff and improving the opening and closing efficiency of the opening and closing valve, so as to quickly provide a channel for the exhaust of smoke.

[0037] A first limit plate 6 and a second limit plate 7 are fixedly connected to the inner wall of the valve body 1. The first limit plate 6 and the second limit plate 7 are located on both sides of the thickness direction of the valve plate 2. The first limit plate 6 and the second limit plate 7 are also located on both sides of the width direction of the valve plate 2. The first limit plate 6 is fixedly connected to the inner top wall of the valve body 1, and the second limit plate 7 is fixedly connected to the inner bottom wall of the valve body 1. The first limit plate 6 is located on the side close to the smoke hood, and the side close to the smoke hood is the windward side of the valve plate 2. The second limit plate 7 is located on the side away from the smoke hood.

[0038] Both ends of the first limit plate 6 in the length direction are fixedly connected with the first auxiliary plate 61, and the two sides of the first auxiliary plate 61 in the thickness direction are flush with the two sides of the first limit plate 6 in the thickness direction. The end of the first auxiliary plate 61 away from the first limit plate 6 extends to be close to the rotation axis 3, and the side wall of the first auxiliary plate 61 is fixedly connected to the inner side walls of the two ends of the length direction of the valve body 1. Both ends of the second limit plate 7 in the length direction are connected with the second auxiliary plate 71, and the side wall of the second auxiliary plate 71 is fixedly connected to the inner side walls of the two ends of the length direction of the valve body 1. The end of the second auxiliary plate 71 away from the second limit plate 7 extends to be close to the rotation axis 3, and the two sides of the second auxiliary plate 71 in the thickness direction are flush with the two sides of the second limit plate 7 in the thickness direction.

[0039] The valve plate 2 can rotate to simultaneously abut against the first limit plate 6 and the first auxiliary, second limit plate 7 and the second auxiliary plate 71, at which time the opening and closing valve is in a closed state; the valve plate 2 can also rotate to simultaneously disengage from the first limit plate 6 and the first auxiliary, second limit plate 7 and the second auxiliary plate 71, at which time the opening and closing valve is in an open state.

[0040] A first sealing groove 62 is provided on the surface of the first limiting plate 6 and the first auxiliary plate 61 close to the valve plate 2, and a first sealing strip 63 is embedded in the first sealing groove 62. The thickness of the first sealing strip 63 is greater than the depth of the first sealing groove 62. A first matching groove 21 corresponding to the first sealing groove 62 is provided on the surface of the valve plate 2 close to the first sealing groove 62. The part of the first sealing strip 63 located outside the first sealing groove 62 penetrates into the first matching groove 21, and the first sealing strip 63 is interference fit with the first sealing groove 62 and the first matching groove 21 at the same time.

[0041] The second limiting plate 7 and the second auxiliary plate 71 are both provided with a second sealing groove 72 on one side close to the valve plate 2, and a second sealing strip 73 is embedded in the second sealing groove 72. The thickness of the second sealing strip 73 is greater than the depth of the second sealing groove 72, and a second matching groove 22 corresponding to the second sealing groove 72 is provided on the side close to the second sealing groove 72 of the valve plate 2. The part of the second sealing strip 73 located outside the second sealing groove 72 penetrates into the second matching groove 22, and the second sealing strip 73 is interference fit with the second sealing groove 72 and the second matching groove 22 at the same time.

[0042] The first sealing strip 63 cooperates with the second sealing strip 73 to improve the sealing between the valve plate 2 and the valve body 1, thereby reducing the unnecessary discharge of smoke through the valve plate 2.

[0043] One end of the first sealing strip 63 outside the first sealing groove 62 is arranged in an arc shape, which is convenient for the first sealing strip 63 to penetrate into the first matching groove 21 . The one end of the second sealing strip 73 outside the second sealing groove 72 is arranged in an arc shape, which is convenient for the second sealing strip 73 to penetrate into the second matching groove 22 .

[0044] Bearings 8 are provided at both ends of the rotating shaft 3 extending outside the valve body 1. The fixing ring of the bearing 8 is connected to the outer wall of the valve body 1 through a sealing ring plate 81. The sealing ring plate 81 is connected to the valve body 1 through mounting bolts. A plurality of mounting bolts are arranged at intervals along the circumference of the sealing ring plate 81. The mounting bolts pass through the valve body 1 and the sealing ring plate 81 in turn and are threadedly connected with mounting nuts to fix the sealing ring plate 81.

[0045] A sealing ring groove 82 is provided on the side of the sealing ring plate 81 that is in contact with the valve body 1, and the mounting bolts are located on the outside of the sealing ring groove 82. A sealing ring 83 is embedded in the sealing ring groove 82. The sealing ring 83 has an interference fit with the inner wall of the sealing ring groove 82 and the outer wall of the valve body 1, thereby improving the sealing between the bearing 8 and the valve body 1 and reducing unnecessary leakage of smoke through the gap between the rotating shaft 3 and the valve body 1.

[0046] The valve plate 2 is connected to the rotating shaft 3 through a connecting assembly, and a plurality of connecting assemblies are arranged at intervals along the axial direction of the rotating shaft 3. The connecting assembly includes a connecting bolt 23 and a connecting nut 24, and the connecting bolt 23 passes through the valve plate 2 and the rotating shaft 3 in sequence and is threadedly connected with the connecting nut 24.

[0047] A reinforcing rib plate 31 is fixedly connected to the rotating shaft 3. A plurality of reinforcing rib plates 31 are arranged at intervals along the axial direction of the rotating shaft 3. A fixing plate 32 is fixedly connected to both sides of the reinforcing rib plate 31 in the thickness direction. The fixing plate 32 is connected to the valve plate 2 through a fixing assembly. The fixing assembly includes a fixing bolt 33 and a fixing nut 34. The fixing bolt 33 passes through the valve plate 2 and the fixing plate 32 in sequence and is threadedly connected to the fixing nut 34.

[0048] By disassembling the connecting bolts 23, the connecting nuts 24, the fixing bolts 33 and the fixing nuts 34, the valve plate 2 can be removed for cleaning or replacement, thereby reducing the situation in which the accumulation of flue gas impurities in the first matching groove 21 affects the penetration of the first sealing strip 63 into the first matching groove 21 and thus affects the sealing performance. It is also convenient to install the first sealing strip 63 and the second sealing strip 73 after the valve plate 2 is removed.

[0049] The end of the rotating shaft 3 passing through the valve plate 2 is fixedly connected with a lever arm plate 9 which is located on the same side as the driving assembly 4 . When the pneumatic motor 41 fails, the staff can also drive the rotating shaft 3 to rotate through the lever arm plate 9 .

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An on-off valve for a smoke exhaust pipe of an electric arc furnace, characterized in that: It comprises a valve body (1) and a valve plate (2), wherein the smoke exhaust pipe comprises two unit pipes, wherein the two unit pipes are respectively connected to a smoke hood and an air pump, wherein the valve body (1) is tubular and is arranged between the two unit pipes, wherein both ends of the valve body (1) are connected to the corresponding unit pipes via flanges (11), wherein the valve plate (2) is rotatably connected to the inside of the valve body (1) via a rotating shaft (3), wherein both ends of the rotating shaft (3) pass through the outside of the valve body (1), and wherein a driving component (4) for driving the rotating shaft (3) to rotate is arranged on the valve body (1); The driving assembly (4) comprises a pneumatic motor (41), and the pneumatic motor (41) drives the rotating shaft (3) to rotate through a synchronizing assembly (5).

2. The on-off valve for the smoke exhaust pipe of a submerged arc furnace according to claim 1 is characterized in that: The synchronization component (5) comprises a driving sprocket (51), a driven sprocket (52) and a synchronization chain (53); the output shaft of the pneumatic motor (41) is coaxially connected to the driving sprocket (51) through a reducer (42); the driven sprocket (52) is sleeved on one end of the rotating shaft (3) extending outside the valve body (1); the synchronization chain (53) is sleeved on the driving sprocket (51) and the driven sprocket (52) at the same time; the synchronization sprocket is meshed with the driving sprocket (51) and the driven sprocket (52) at the same time.

3. The on-off valve for the smoke exhaust pipe of a submerged arc furnace according to claim 1, characterized in that: A first limit plate (6) and a second limit plate (7) are fixedly connected to the inner wall of the valve body (1); the first limit plate (6) and the second limit plate (7) are located on both sides of the thickness direction of the valve plate (2); the first limit plate (6) and the second limit plate (7) are also located on both sides of the width direction of the valve plate (2); the first limit plate (6) is fixedly connected to the inner top wall of the valve body (1); the second limit plate (7) is fixedly connected to the inner bottom wall of the valve body (1); the first limit plate (6) is located on the side close to the smoke hood; the second limit plate (7) is located on the side away from the smoke hood; the valve plate (2) can be rotated to abut against the first limit plate (6) and the second limit plate (7) at the same time; the valve plate (2) can also be rotated to be separated from the first limit plate (6) and the second limit plate (7) at the same time.

4. The on-off valve for the smoke exhaust pipe of a submerged arc furnace according to claim 3 is characterized in that: Both ends of the first limiting plate (6) in the length direction are connected to first auxiliary plates (61), one end of the first auxiliary plate (61) away from the first limiting plate (6) extends close to the rotation axis (3), and the side walls of the first auxiliary plate (61) are fixedly connected to the inner side walls of the two ends of the valve body (1) in the length direction; both ends of the second limiting plate (7) in the length direction are connected to second auxiliary plates (71), the side walls of the second auxiliary plate (71) are fixedly connected to the inner side walls of the two ends of the valve body (1) in the length direction, and the end of the second auxiliary plate (71) away from the second limiting plate (7) extends close to the rotation axis (3); The valve plate (2) can be rotated to abut against the first auxiliary plate (61) and the second auxiliary plate (71) at the same time, and the valve plate (2) can also be rotated to be separated from the first auxiliary plate (61) and the second auxiliary plate (71) at the same time.

5. The on-off valve for the smoke exhaust pipe of a submerged arc furnace according to claim 4 is characterized in that: A first sealing groove (62) is provided on one side of the first limiting plate (6) and the first auxiliary plate (61) close to the valve plate (2); a first sealing strip (63) is embedded in the first sealing groove (62); the thickness of the first sealing strip (63) is greater than the depth of the first sealing groove (62); a first matching groove (21) corresponding to the first sealing groove (62) is provided on one side of the valve plate (2) close to the first sealing groove (62); a portion of the first sealing strip (63) located outside the first sealing groove (62) penetrates into the first matching groove (21); and the first sealing strip (63) is simultaneously interference-fitted with the first sealing groove (62) and the first matching groove (21); The second limiting plate (7) and the second auxiliary plate (71) are both provided with a second sealing groove (72) on one side close to the valve plate (2); a second sealing strip (73) is embedded in the second sealing groove (72); the thickness of the second sealing strip (73) is greater than the depth of the second sealing groove (72); a second matching groove (22) corresponding to the second sealing groove (72) is provided on one side close to the second sealing groove (72); the portion of the second sealing strip (73) outside the second sealing groove (72) penetrates into the second matching groove (22); the second sealing strip (73) is simultaneously interference fit with the second sealing groove (72) and the second matching groove (22); One end of the first sealing strip (63) located outside the first sealing groove (62) is arranged in an arc shape, and one end of the second sealing strip (73) located outside the second sealing groove (72) is arranged in an arc shape.

6. The on-off valve for the smoke exhaust pipe of a submerged arc furnace according to claim 1, characterized in that: Bearings (8) are provided at both ends of the rotating shaft (3) extending outside the valve body (1); a fixing ring of the bearing (8) is connected to the outer side wall of the valve body (1) via a sealing ring plate (81); and the sealing ring plate (81) is connected to the valve body (1) via mounting bolts.

7. The on-off valve for the smoke exhaust pipe of a submerged arc furnace according to claim 6, characterized in that: A sealing ring groove (82) is provided on the side of the sealing ring plate (81) that contacts the valve body (1), a sealing ring (83) is embedded in the sealing ring groove (82), and the sealing ring (83) is interference-fitted with the inner wall of the sealing ring groove (82) and the valve body (1).

8. The on-off valve for the smoke exhaust pipe of a submerged arc furnace according to claim 1, characterized in that: The valve plate (2) is connected to the rotating shaft (3) via a connecting assembly, and a plurality of connecting assemblies are arranged at intervals along the axial direction of the rotating shaft (3); The connection assembly comprises a connection bolt (23) and a connection nut (24); the connection bolt (23) passes through the valve plate (2) and the rotating shaft (3) in sequence and is then threadedly connected to the connection nut (24).

9. The on-off valve for the smoke exhaust pipe of a submerged arc furnace according to claim 1, characterized in that: A reinforcing rib plate (31) is fixedly connected to the rotating shaft (3), a plurality of reinforcing rib plates (31) are arranged at intervals along the axial direction of the rotating shaft (3), and fixing plates (32) are arranged on both sides of the reinforcing rib plate (31) in the thickness direction, and the fixing plates (32) are connected to the valve plate (2) via a fixing assembly; The fixing assembly comprises a fixing bolt (33) and a fixing nut (34); the fixing bolt (33) passes through the valve plate (2) and the fixing plate (32) in sequence and is then threadedly connected to the fixing nut (34).

10. The on-off valve for the smoke exhaust pipe of a submerged arc furnace according to claim 1, characterized in that: One end of the rotating shaft (3) passing through the valve plate (2) is connected to a lever arm plate (9), and the lever arm plate (9) and the driving assembly (4) are located on the same side.

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