Air tightness detection equipment for control valve

Abstract

The invention discloses air tightness detection equipment for a control valve, and relates to the technical field of air tightness detection.The air tightness detection equipment comprises a test water tank, stabilizing plates are fixedly installed at the two ends of the test water tank, an air pipe is installed between the two stabilizing plates, and one end of the air pipe penetrates out of the stabilizing plates and is provided with an air guide nozzle; one end of the air pipe is an output end, the other end of the air pipe is an output end, a plurality of supporting cavity walls are installed on the air pipe at equal intervals, and placing plates are fixedly installed at the two ends of each supporting cavity wall. Therefore, each alignment ball is blown to the edge of the guide disc to be in contact with the bottom port of the valve, the axis of the valve and the axis of the guide disc are located on the same axis, high-pressure gas can directly align to a sealing assembly in the valve, and resistance generated after the gas makes contact with a pipeline is reduced. Two ends of the valve are contacted with the rubber ring to improve the sealing performance of the valve during testing.

Description

Technical Field

[0001] The invention relates to the technical field of air tightness detection, in particular to an air tightness detection device for a control valve. Background Art

[0002] A control valve is an essential device for connecting pipelines and controlling the flow rate in pipelines, which is commonly used in daily life. It is used to adjust the pressure of the fluid passing through it, that is, the difference between the inlet pressure and the outlet pressure of the valve is fixed within a preset pressure difference. After the valve is produced, it is necessary to test the air tightness of the valve to determine whether the valve is leaking. The existing valve air tightness measurement usually immerses the entire valve in liquid, then fills the valve with gas, and then observes whether bubbles are generated in the liquid to determine the air tightness of the valve. However, the above-mentioned traditional valve testing method is not accurate, because leakage may also occur due to installation errors between the connection position of the air tightness test fixture and the valve, that is, bubbles may also be generated in the liquid, which will cause misjudgment of valve leakage. At the same time, during the air tightness test of traditional valves, regardless of whether the valve is airtight or not, the entire valve needs to be immersed in liquid, causing the internal components of the valve to contact the liquid. Even if the air tightness of the valve is tested to be good, the valve needs to be manually taken out after the test to dry the liquid accumulated inside before the valve can be packaged, which seriously delays the production efficiency of the valve. Summary of the invention

[0003] The object of the present invention is to provide a device for detecting air tightness of a control valve to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for detecting air tightness of a control valve, comprising a test water tank, both ends of the test water tank are fixedly installed with a stabilizing plate, an air pipe is installed between the two stabilizing plates, one end of the air pipe passes through the stabilizing plate and is installed with an air guide nozzle, the other end of the air pipe is an output end, a plurality of supporting cavity walls are equidistantly installed on the air pipe, both ends of the supporting cavity walls are fixedly installed with a placing plate, one side of each placing plate is fixedly installed with a symmetrically distributed fixing rod, a pressure spray disc is slidably connected to the two fixing rods, a first screw rod is threadedly connected to the pressure spray disc, a rotating handle is fixedly installed on one end of the first screw rod, a bearing is fixedly installed on the other end of the first screw rod, the bearing is fixedly connected to the placing plate, and the output end of the air pipe rotates to drive each supporting cavity wall to rotate so that the valve is immersed in the test water tank.

[0005] Preferably, rubber rings are fixedly installed on the opposite surfaces of the mounting plate and the pressure spray plate, a guide plate is fixedly installed on each of the mounting plates, the guide plate is located on the inner ring of one of the rubber rings, and the valve is connected to the support cavity wall through the guide plate, a plurality of alignment balls are slidably connected to the guide plate, the plurality of alignment balls are arranged in a ring shape on the guide plate, and the movement direction of each alignment ball is radial movement toward the axis of the guide plate, and a fixing plate is fixedly installed between the tops of the two fixing rods.

[0006] Preferably, a plurality of partition plates are fixedly installed inside the test water tank, and each of the partition plates is located between two supporting cavity walls.

[0007] Preferably, each of the spray-pressure discs is provided with an alignment opening on a side away from the fixing rod, and the alignment opening and the axis of the rubber ring and the first screw rod are in the same plane.

[0008] Preferably, one side of the test water trough is rotatably connected to a second rotating rod, and a plurality of second worm gears are fixedly connected to the second rotating rod, and a plurality of fixed plates are equidistantly installed on both sides of the test water trough, and each fixed plate located on one side of the test water trough is rotatably connected to a second screw rod, one end of the second screw rod passes through the fixed plate and is installed with a second worm gear, and the second worm gear is meshingly connected to the second worm gear, and each fixed plate located on the other side of the test water trough is rotatably connected to a third screw rod, and each of the second and third screw rods is threadedly connected to a moving block, and one end of a spring is fixedly connected to the top of each of the moving blocks, and the other end of the spring is fixedly connected to a driving plate, and the driving plate is slidably connected to the moving block, and a plurality of collision racks are installed on the driving plate, and the two driving plates are arranged parallel to each other.

[0009] Preferably, the other side of the test water trough is rotatably connected to a transition rod, one end of the transition rod is fixedly installed with a first gear, the other side of the test water trough and located below the transition rod is rotatably connected to a first rotating rod, one end of the first rotating rod is fixedly installed with a second gear, a plurality of first worm gears are equidistantly arranged on the first rotating rod, one end of the third screw rod passes through a fixed plate and is fixedly connected to a first worm wheel, the first worm gear and the first worm wheel are meshed for transmission, and the first gear and the second gear are meshed for transmission.

[0010] Preferably, a plurality of water guide plates are fixedly connected to the transition rod, the water guide plates are cross-shaped, and a water trough for holding water is provided on each side wall of the water guide plate, each of the water guide plates corresponds to the movement trajectory of the valve, the sweeping trajectory of one end of the turning handle is close to the water guide plate and does not exceed the length from the water guide plate to the air pipe, and a water collecting trough is fixedly installed on the outside of the test water trough near the bottom of the water guide plate.

[0011] Preferably, the test water trough is connected to a motor near the bottom of the output end of the air pipe, the output shaft of the motor is connected to an output belt, the output belt is connected to the output end of the air pipe, the output end of the air pipe is transmission-connected to a first pulley, one end of the first pulley is connected to a transition rod, the output end of the air pipe is transmission-connected to a second pulley near the first pulley, one end of the second pulley is fixedly connected to a second rotating rod.

[0012] Preferably, the driving plate is L-shaped, and the bottom of the collision rack is close to the outer side of the moving block, and the collision rack is made of soft non-slip material.

[0013] Preferably, the distance between the two second screw rods is equal to the distance between the injection plates located at two ends of the same supporting cavity wall.

[0014] Compared with the prior art, the present invention has the following beneficial effects: During the manual valve placement process of the present invention, the guide disc can limit the valve to prevent the valve port from being offset when being fixed. After the valve is placed on the placement plate, a sufficient amount of high-pressure gas can be introduced into the air pipe in advance. During the process of passing through the guide disc, the high-pressure gas enters the channel inside the guide disc and communicates with the alignment ball, and then blows each alignment ball to the edge of the guide disc and the bottom port of the valve, so that the valve axis and the guide disc axis are on the same axis, and then the high-pressure gas can be directly aligned with the sealing component inside the valve, reducing the resistance after the gas and the pipeline are in contact. The contact between the two ends of the valve and the rubber ring can improve the sealing performance of the valve during testing. The valve knob contacts the collision rack on the other side of the test water tank, so that the valve knob contacts the collision rack again to reverse the valve knob. After the sealing assembly (valve core) is opened, the high-pressure gas inside the air pipe is ejected along the other end of the valve to discharge excess water inside the valve, solving the problem of water inside the valve and improving the production efficiency of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the enlarged structure at A in the middle; Figure 3 For the present invention Figure 1 A schematic diagram of the enlarged structure at B in the middle; Figure 4 It is a structural schematic diagram of the motor of the present invention; Figure 5 It is a schematic diagram of the internal structure of the moving block of the present invention; Figure 6It is a structural schematic diagram of the second rotating rod and the first rotating rod of the present invention; Figure 7 It is a schematic diagram of the structure of the supporting cavity wall of the present invention; Figure 8 It is a schematic diagram of the cross-sectional structure of the guide plate of the present invention.

[0016] In the figure: 1-test water tank; 101-partition plate; 102-stabilizing plate; 2-water collecting tank; 3-air pipe; 4-support cavity wall; 401-air guide nozzle; 5-placement plate; 6-guide plate; 7-alignment ball; 8-fixing rod; 9-fixing plate; 10-first screw rod; 11-bearing; 12-turn handle; 13-pressure spray plate; 14-rubber ring; 15-motor; 16-first pulley; 17-second pulley; 18-first rotating rod; 19-transition rod; 20-water guide plate; 21-first worm; 22-first worm wheel; 23-first gear; 24-second gear; 25-fixing plate; 26-moving block; 27-spring; 28-second screw rod; 29-driving plate; 30-collision rack; 31-second rotating rod; 32-third screw rod; 33-second worm; 34-second worm wheel. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-8The present invention provides a technical solution: a device for detecting air tightness of a control valve, comprising a test water tank 1, both ends of the test water tank 1 are fixedly installed with a stabilizing plate 102, an air pipe 3 is installed between the two stabilizing plates 102, one end of the air pipe 3 passes through the stabilizing plate 102 and is installed with an air guide nozzle 401, the other end of the air pipe 3 is an output end, a plurality of supporting cavity walls 4 are equidistantly installed on the air pipe 3, both ends of the supporting cavity wall 4 are fixedly installed with a placing plate 5, one side of each placing plate 5 is fixedly installed with a symmetrically distributed fixing rod 8, two of the fixing rods 8 are slidably connected with a pressure spraying disk 13, a first screw rod 10 is threadedly connected to the pressure spraying disk 13, one end of the first screw rod 10 is fixedly installed with a turning handle 12, the other end of the first screw rod 10 is fixedly installed with a bearing 11, the bearing 11 is fixedly connected to the placing plate 5, the output end of the air pipe 3 rotates to drive each supporting cavity wall 4 to rotate so that the valve is immersed in Inside the test water tank 1, first, after the valve is produced and assembled, it is necessary to test its sealing performance. Multiple valves are manually installed between the mounting plate 5 and the pressure spray disc 13. Each valve is manually turned to a locked state, and then the handle 12 is manually turned. The rotation of the handle 12 causes the first screw 10 to rotate and drive the pressure spray disc 13 to descend to clamp the ports at both ends of the valve. After the valve is clamped, the air pipe 3 is rotated to support the cavity wall 4 perpendicular to the test water tank 1, and then a sufficient amount of clean water is filled into the test water tank 1, and then a sufficient amount of high-pressure gas is input through the air guide nozzle 401. The high-pressure gas is distributed to the inside of each supporting cavity wall 4 through the air pipe 3, and the high-pressure gas is then discharged from each supporting cavity wall 4 into the valve. It is manually observed whether bubbles are generated at the sealing of each valve. After the test of the valves located at the same end of the multiple supporting cavity walls 4 is completed, the air pipe 3 is rotated 180 degrees, and the valve at the other end of the supporting cavity wall 4 is tested for sealing, thereby improving the test capacity.

[0019] Further, rubber rings 14 are fixedly installed on the opposite surfaces of the placement plate 5 and the pressure spray plate 13, and a guide plate 6 is fixedly installed on each of the placement plates 5. The guide plate 6 is located at the inner ring of one of the rubber rings 14, and the valve is connected to the support cavity wall 4 through the guide plate 6. A plurality of alignment balls 7 are slidably connected to the guide plate 6. The plurality of alignment balls 7 are arranged in an annular shape on the guide plate 6, and the movement direction of each alignment ball 7 is radially movable toward the axis of the guide plate 6. A fixing plate 9 is fixedly installed between the tops of the two fixing rods 8. When the valve is manually placed, the guide plate 6 can limit the valve. To prevent the valve port from shifting when it is fixed, after the valve is placed on the mounting plate 5, a sufficient amount of high-pressure gas can be introduced into the air pipe 3 in advance. When passing through the guide plate 6, the high-pressure gas enters the channel inside the guide plate 6 and communicates with the alignment ball 7, and then blows each alignment ball 7 to the edge of the guide plate 6 and the contact with the bottom port of the valve, so that the valve axis and the guide plate 6 axis are on the same axis, so that the high-pressure gas can be directly aligned with the internal sealing component of the valve when entering the valve, reducing the resistance after the gas and the pipeline are in contact. The contact between the two ends of the valve and the rubber ring 14 can improve the sealing performance of the valve during testing.

[0020] Furthermore, a plurality of partition plates 101 are fixedly installed inside the test water tank 1, each of the partition plates 101 is respectively located between the two supporting cavity walls 4, and each of the spray plate 13 is provided with an alignment opening on a side away from the fixing rod 8, and the alignment opening and the axis of the rubber ring 14 and the first screw rod 10 are in the same plane, and the alignment opening is as shown in the attached Figure 2 As shown, during the installation of the valve, the knob on the outside of the valve used to control the valve sealing assembly needs to be aligned with the alignment port. The alignment can be made by referring to the axis of the rubber ring 14, the center line of the knob and the first screw rod 10 to prevent the valve and the knob from being offset during installation; the partition plate 101 can prevent multiple valves from rotating at the same time to cause water disturbance, which makes it inconvenient to observe the bubbles in the water area.

[0021] Furthermore, one side of the test water tank 1 is rotatably connected to a second rotating rod 31, and a plurality of second worm gears 33 are fixedly connected to the second rotating rod 31. A plurality of fixed plates 25 are equidistantly installed on both sides of the test water tank 1. A second screw 28 is rotatably connected to each fixed plate 25 on one side of the test water tank 1. One end of the second screw 28 passes through the fixed plate 25 and is installed with a second worm gear 34. The second worm gear 33 is meshed with the second worm gear 34. A third screw 32 is rotatably connected to each fixed plate 25 on the other side of the test water tank 1. A moving block 26 is threadedly connected to each of the second screw 28 and the third screw 32. Each of the moving blocks 26 has a The top is fixedly connected with one end of a spring 27, and the other end of the spring 27 is fixedly connected with a driving plate 29, and the driving plate 29 is slidably connected to the moving block 26. A plurality of collision racks 30 are installed on the driving plate 29, and the two driving plates 29 are arranged parallel to each other; the distance between the two second screw rods 28 is equal to the distance between the pressure spray plates 13 located at both ends of the same supporting cavity wall 4; the shape of the driving plate 29 is L-shaped, and the bottom of the collision rack 30 is close to the outer side of the moving block 26, and the collision rack 30 is made of soft non-slip material; the test water tank 1 is connected to a motor 15 near the bottom of the output end of the air pipe 3, and the output of the motor 15 The shaft is connected with an output belt, and the output belt is connected to the output end of the trachea 3. The output end of the trachea 3 is connected to a first pulley 16 in a transmission manner, and one end of the first pulley 16 is connected to a transition rod 19. The output end of the trachea 3 is connected to a second pulley 17 near the first pulley 16, and one end of the second pulley 17 is fixedly connected to a second rotating rod 31. In this embodiment, after the valve is manually installed, the external knob of the valve does not need to be tightened manually. After the valve is installed on the mounting plate 5, the trachea 3 can be directly driven by the motor 15 to rotate. When the trachea 3 rotates, the mounting plate 5 is driven to rotate on each supporting cavity wall 4, and the motor 15 rotates at the same time. In the process, the second pulley 17 is driven to operate, the second pulley 17 drives the second rotating rod 31 to rotate, the second rotating rod 31 rotates to drive the second worm 33 to rotate, the second worm 33 rotates to drive the second worm wheel 34 to rotate, so that the moving block 26 moves away from the second rotating rod 31, and then in the process of the placing plate 5 driving the valve to rotate, the collision rack 30 contacts the knob on the valve, the spring 27 produces a compression effect, the driving plate 29 produces a driving force, and the collision rack 30 gives the driving force source of the knob to rotate the knob, and then the valve is deeply locked, and then the valve is immersed in water, the motor 15 stops rotating, and the high-pressure gas is continuously introduced into the air pipe 3; As a further preferred embodiment, the other side of the test water tank 1 is rotatably connected to a transition rod 19, one end of the transition rod 19 is fixedly installed with a first gear 23, the other side of the test water tank 1 and located below the transition rod 19 is rotatably connected to a first rotating rod 18, one end of the first rotating rod 18 is fixedly installed with a second gear 24, a plurality of first worm gears 21 are equidistantly arranged on the first rotating rod 18, one end of the third screw rod 32 passes through the fixed plate 25 and is fixedly connected to the first worm wheel 22, the first worm gear 21 and the first worm wheel 22 are meshed for transmission, the first gear 23 and the second gear 24 are meshed for transmission, After the test of the valve in the water is completed, the motor 15 is restarted to rotate, so that the valve that has been tested is transferred from the test water tank 1. During the rotation of these valves, the valve is in the process of discharging water, and since one end of the valve is connected to the outside world, the water inside the valve is poured out, wherein the motor 15 drives the first pulley 16 to rotate, and the first pulley 16 drives the transition rod 19 to rotate, and the first gear 23 and the second gear 24 are engaged between the transition rod 19 and the first rotating rod 18, so that the third screw rod 32 rotates in opposite directions, so that the moving blocks 26 on both sides are in synchronous opposite movement when the motor 15 rotates, as shown in the attached figure. Figure 7 As shown, the valve knob contacts the collision rack 30 on the other side of the test water tank 1, so that the valve knob contacts the collision rack 30 again to reverse the valve knob. After the sealing component (valve core) is opened, the high-pressure gas inside the air pipe 3 is ejected along one end of the valve to discharge excess water inside the valve. Then the motor 15 stops rotating, and the valves that have been tested can be collected manually.

[0022] Furthermore, a plurality of water guide plates 20 are fixedly connected to the transition rod 19, and the water guide plates 20 are cross-shaped, and a water trough for holding water is provided on each side wall of the water guide plates 20, and each of the water guide plates 20 corresponds to the movement trajectory of the valve, and the sweeping trajectory of one end of the turning handle 12 is close to the water guide plate 20 and does not exceed the length from the water guide plate 20 to the air pipe 3, and a water collecting trough 2 is fixedly installed on the outside of the test water tank 1 near the bottom of the water guide plate 20, in order to reduce the generation of bubbles in the water body inside the test water tank 1 after the liquid is sprayed out from one end of the valve to form a water flow, and in order to reduce the waiting time for the elimination of bubbles, when the transition rod 19 rotates, the liquid sprayed out from one end of the valve is sprayed into the inside of the water guide plate 20, and the second turning rod 31 and the transition rod 19 rotate synchronously in the same direction to pour the liquid on the water guide plate 20 into the inside of the water collecting trough 2.

[0023] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for testing the air tightness of a control valve, comprising a test water tank (1), Features: Both ends of the test water tank (1) are fixedly mounted with stabilizing plates (102), an air pipe (3) is mounted between the two stabilizing plates (102), one end of the air pipe (3) passes through the stabilizing plate (102) and is mounted with an air guide nozzle (401), the other end of the air pipe (3) is an output end, a plurality of supporting cavity walls (4) are equidistantly mounted on the air pipe (3), both ends of the supporting cavity walls (4) are fixedly mounted with mounting plates (5), and one side of each mounting plate (5) is fixedly mounted with a symmetrical The invention relates to a plurality of fixed rods (8) distributed thereon, two of the fixed rods (8) being slidably connected to pressure spray discs (13), a first screw rod (10) being threadedly connected to the pressure spray disc (13), a rotating handle (12) being fixedly mounted on one end of the first screw rod (10), a bearing (11) being fixedly mounted on the other end of the first screw rod (10), the bearing (11) being fixedly connected to a mounting plate (5), and the output end of the air pipe (3) rotating to drive each supporting cavity wall (4) to rotate so that the valve is immersed in the test water tank (1).

2. A device for detecting air tightness of a control valve according to claim 1, Features: Rubber rings (14) are fixedly mounted on the opposite surfaces of the placement plate (5) and the pressure spray plate (13), and a guide plate (6) is fixedly mounted on each of the placement plates (5). The guide plate (6) is located on the inner ring of one of the rubber rings (14), and the valve is connected to the support cavity wall (4) through the guide plate (6). A plurality of alignment balls (7) are slidably connected to the guide plate (6). The plurality of alignment balls (7) are arranged in a ring shape on the guide plate (6), and the movement direction of each alignment ball (7) is radial movement toward the axis of the guide plate (6). A fixing plate (9) is fixedly mounted between the tops of the two fixing rods (8).

3. The air tightness detection device for a control valve according to claim 1, Features: A plurality of partition plates (101) are fixedly installed inside the test water tank (1), and each of the partition plates (101) is located between two supporting cavity walls (4).

4. The air tightness detection device for a control valve according to claim 2, Features: Each of the spraying discs (13) is provided with an alignment opening on a side away from the fixing rod (8), and the alignment opening and the axis of the rubber ring (14) and the first screw rod (10) are located on the same plane.

5. The air tightness detection device for a control valve according to claim 1, Features: One side of the test water tank (1) is rotatably connected to a second rotating rod (31), and a plurality of second worm gears (33) are fixedly connected to the second rotating rod (31). A plurality of fixed plates (25) are equidistantly installed on both sides of the test water tank (1), and each fixed plate (25) located on one side of the test water tank (1) is rotatably connected to a second screw rod (28), one end of the second screw rod (28) passes through the fixed plate (25) and is installed with a second worm gear (34), and the second worm gear (33) is meshingly connected to the second worm gear (34). Each fixed plate (25) on the other side of the groove (1) is rotatably connected to a third screw rod (32), each of the second screw rod (28) and the third screw rod (32) is threadedly connected to a moving block (26), the top of each moving block (26) is fixedly connected to one end of a spring (27), the other end of the spring (27) is fixedly connected to a driving plate (29), the driving plate (29) is slidably connected to the moving block (26), a plurality of collision racks (30) are mounted on the driving plate (29), and the two driving plates (29) are arranged parallel to each other.

6. The air tightness detection device for a control valve according to claim 1, Features: The other side of the test water tank (1) is rotatably connected to a transition rod (19), one end of which is fixedly mounted a first gear (23), and the other side of the test water tank (1) is rotatably connected to a first rotating rod (18) located below the transition rod (19), one end of which is fixedly mounted a second gear (24), a plurality of first worm gears (21) are equidistantly arranged on the first rotating rod (18), one end of the third screw rod (32) passes through a fixed plate (25) and is fixedly connected to a first worm gear (22), the first worm gear (21) and the first worm gear (22) are meshed for transmission, and the first gear (23) and the second gear (24) are meshed for transmission.

7. A device for detecting air tightness of a control valve according to claim 6, Features: A plurality of water guide plates (20) are fixedly connected to the transition rod (19), the water guide plates (20) are in a cross shape, and each side wall of the water guide plates (20) is provided with a water trough for holding water, each of the water guide plates (20) corresponds to a movement trajectory of the valve, the sweeping trajectory of one end of the turning handle (12) is close to the water guide plate (20) and does not exceed the length from the water guide plate (20) to the air pipe (3), and a water collecting trough (2) is fixedly installed on the outside of the test water trough (1) near the bottom of the water guide plate (20).

8. The air tightness detection device for a control valve according to claim 6, Features: The test water tank (1) is connected to a motor (15) at the bottom of the output end of the air pipe (3), the output shaft of the motor (15) is connected to an output belt, the output belt is connected to the output end of the air pipe (3), the output end of the air pipe (3) is connected to a first pulley (16) in a transmission manner, one end of the first pulley (16) is connected to a transition rod (19), the output end of the air pipe (3) is connected to a second pulley (17) in a transmission manner near the first pulley (16), one end of the second pulley (17) is fixedly connected to a second rotating rod (31).

9. The air tightness detection device for a control valve according to claim 5, Features: The driving plate (29) is L-shaped, and the bottom of the collision rack (30) is close to the outer side of the moving block (26). The collision rack (30) is made of a soft non-slip material.

10. The air tightness detection device for a control valve according to claim 5, Features: The distance between the two second screw rods (28) is equal to the distance between the injection plates (13) located at two ends of the same support cavity wall (4).

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