Assembling and pressure testing device for pressure-resistant double-seal butterfly valve castings

Abstract

The application discloses an assembly and pressure testing device for a pressure-resistant double-seal butterfly valve casting, and belongs to the technical field of valve production. The device is used for solving the problems of the traditional butterfly valve assembly, such as the valve body being unable to rotate for adjustment, the complicated structure of the pressure testing device and the inaccurate testing. The device assembly part is provided with support frames on the two sides of the equipment frame, a moving plate slides in the support frames, a clamping plate is driven by an adjusting screw and a threaded plate to clamp the butterfly valve body, a connecting pipe is rotationally connected with a moving rod, and the valve body can be rotated; the pressure testing part is that hydraulic oil in an oil tank is pushed by an electric push rod to drive an installation cover and a piston plate, the hydraulic oil is conveyed into the butterfly valve body through a conveying pipe and a butt joint mechanism, and a pressure sensor detects the pressure and displays the pressure. The device is convenient for flexible adjustment during the butterfly valve assembly, can accurately butt joint and stably transmit the pressure, and can accurately test the pressure resistance.

Description

Technical Field

[0001] This utility model relates to the field of valve manufacturing technology, and in particular to an assembly and pressure testing device for a pressure-resistant double-seal butterfly valve casting. Background Technology

[0002] In the production process of pressure-resistant double-seal butterfly valves, the assembly stage is a crucial step in ensuring the valve's performance and quality. Traditional butterfly valve assembly devices present several inconveniences during operation. For example, after positioning and clamping the valve body during assembly, the valve body cannot be rotated or adjusted when assembling internal components, thus limiting flexible adjustments during assembly.

[0003] Meanwhile, after the butterfly valve is assembled, it needs to be pressure tested to verify whether its pressure resistance meets the design standards. Existing pressure testing devices are complex in structure and cumbersome to operate. Furthermore, they are difficult to accurately connect to the butterfly valve and achieve stable pressure transmission during the testing process, resulting in inaccurate test results and failing to provide a reliable basis for the quality assessment of the butterfly valve. Therefore, we propose an assembly and pressure testing device for pressure-resistant double-seal butterfly valve castings to solve the aforementioned problems. Utility Model Content

[0004] The purpose of this invention is to solve the shortcomings of traditional butterfly valves, such as the inability to rotate and adjust the valve body during assembly, and the complex structure and inaccurate testing of the pressure measuring device. Therefore, this invention proposes an assembly and pressure measuring device for a pressure-resistant double-seal butterfly valve casting.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An assembly device for a pressure-resistant double-seal butterfly valve casting includes an equipment frame, with support frames symmetrically fixed to the inner walls of both sides of the equipment frame by bolts, a movable plate slidably connected inside the support frame, a movable rod fixedly installed on one side of the movable plate, one end of the movable rod extending into the equipment frame, and a threaded plate fixedly installed on the top of the movable plate. An adjusting screw is rotatably connected to the inner wall of one side of the equipment frame. One end of the adjusting screw is rotatably connected to the top of the support frame, and the other end is fixedly installed with a handwheel. The adjusting screw passes through the threaded plate and is threadedly connected to the threaded plate. One end of the moving rod extends into the connecting pipe and is rotatably connected to the inner wall of the connecting pipe. The connecting pipe is fixedly installed on one side of the clamping plate, and the butterfly valve body is clamped between the two clamping plates. When assembling the butterfly valve body, the handwheel is turned to drive the adjusting screw to rotate. Under the action of threaded transmission, the threaded plate drives the moving plate to move, so that the clamping plate holds and positions the butterfly valve body. Since the connecting pipe is rotatably connected to the moving rod, the valve body of the butterfly valve body can be rotated and adjusted.

[0006] In one possible design, a fixed ring is fixedly mounted on the movable rod within the equipment frame, and an installation ring is fixedly mounted on the connecting pipe. A sliding connecting rod passes through the installation ring, and an insertion hole is opened on the fixed ring. The insertion rod passes through the insertion hole and is movably engaged with the insertion hole. A tension spring is fitted on the insertion rod, and both ends of the tension spring are fixedly connected to one side of the installation ring and one end of the insertion rod respectively via hooks. After the butterfly valve body is rotated to a vertical position, the insertion rod is released, and the tension spring pulls the insertion rod to insert into the insertion hole, positioning the connecting pipe and keeping the butterfly valve body in a stable position during pressure detection.

[0007] A pressure testing device is applied to the assembly device of the aforementioned pressure-resistant double-seal butterfly valve casting. It includes an oil tank fixedly mounted on a frame, containing hydraulic oil. A pushing mechanism is installed on one side of the oil tank, extending into the tank and tightly fitting against its inner wall. Two docking mechanisms are symmetrically connected within the frame, with their adjacent sides clamping the inlet and outlet ends of the butterfly valve body, respectively. A delivery pipe is fixedly mounted through one side of the inner wall of the oil tank, with hydraulic oil located between the delivery pipe and the pushing mechanism. The top end of the delivery pipe is connected to a docking mechanism located on one side. The pushing mechanism delivers the hydraulic oil through the delivery pipe and docking mechanism into the butterfly valve body for pressure testing.

[0008] In one possible design, the actuating mechanism includes an electric push rod fixedly mounted on one side of the oil tank. The output shaft of the electric push rod extends into the oil tank and is fixedly mounted on a mounting cover. A pressure rod is slidably connected inside the mounting cover. One end of the pressure rod extends into the mounting cover and is fixedly mounted on a piston plate. The piston plate is tightly fitted against the inner wall of the oil tank. Activating the electric push rod causes the mounting cover to move laterally, which in turn pushes the piston plate laterally, pushing hydraulic oil through the delivery pipe into the docking mechanism, and then into the butterfly valve body for pressure testing.

[0009] In one possible design, a pressure sensor is fixedly installed on the inner wall of one side of the mounting cover, and a display screen is fixedly installed on the outside of the oil tank. The display screen is electrically connected to the pressure sensor. After the hydraulic oil exerts a thrust on the valve plate of the butterfly valve body, the valve plate generates a reverse force through the hydraulic oil, which acts on the pressure sensor through the piston plate and the pressure rod. The pressure sensor transmits the pressure information to the display screen for display, so as to accurately measure the maximum pressure resistance value of the butterfly valve body.

[0010] In one possible design, the docking mechanism includes an externally threaded pipe that penetrates the inner wall of the equipment frame and is fixedly connected to the inner wall of the equipment frame. A movable pipe is fitted onto the externally threaded pipe. A sealing ring is fixedly installed at one end of the externally threaded pipe inside the movable pipe, and the sealing ring is tightly fitted to the inner wall of the movable pipe. A docking cover is fixedly installed at one end of the movable pipe. The docking covers located on the two docking mechanisms are respectively tightly engaged with the inlet and outlet ends of the butterfly valve body. A sealing ring is also fixedly installed on one side of the inner wall of the docking cover, and one side of the sealing ring extends into the butterfly valve body and is tightly fitted to the inner wall of the butterfly valve body. A nut is rotatably connected to the other end of the movable pipe. The externally threaded pipe passes through the nut and is threadedly connected to the nut. The top end of the delivery pipe is fixedly connected to one end of the externally threaded pipe located on one side. After the butterfly valve body is rotated to a vertical position and positioned, the nut is rotated. Under the action of the threaded transmission, the movable pipe drives the docking cover to move closer to the butterfly valve body, realizing a tight clamping docking, so that hydraulic oil can be delivered to the butterfly valve body for pressure testing.

[0011] In one possible design, the support frame is a U-shaped channel steel with a longitudinal groove inside, and the moving plate is embedded in the groove to achieve longitudinal sliding; the U-shaped channel steel support frame and the longitudinal groove provide a stable sliding track for the moving plate, ensuring that the moving plate moves accurately and that the clamping plate accurately clamps the butterfly valve body.

[0012] In this application, the butterfly valve body is placed in a suitable position between two clamping plates inside the equipment frame. Then, the handwheel is turned, driving the adjusting screw to rotate. Since the adjusting screw passes through and is threadedly connected to the threaded plate, and the threaded plate is fixedly installed on the top of the moving plate, the moving plate slides within the support frame under the action of the threaded transmission. The moving plate drives the moving rod to move, thereby causing the clamping plates to move closer to the butterfly valve body until the two clamping plates clamp and position the butterfly valve body. During assembly, if it is necessary to rotate and adjust the valve body of the butterfly valve, since the connecting pipe is rotatably connected to the moving rod, the valve body of the butterfly valve can be directly rotated, and the connecting pipe will rotate on the moving rod. The valve body can now be rotated flexibly to meet different assembly requirements. When pressure testing is required on the assembled butterfly valve body, it can be rotated to a vertical position. At this point, the insertion rod aligns with the insertion hole on the retaining ring. Releasing the insertion rod will cause the tension spring, under stress, to pull the insertion rod to move, automatically inserting it into the insertion hole. This positions the connecting pipe and further ensures the butterfly valve body remains stable during subsequent pressure testing. Next, the two nuts are rotated. Since the nuts are threaded to the external threaded pipe, the moving pipe moves along the external threaded pipe under the action of the threaded drive. The moving pipe drives the mating cover closer to the butterfly valve body until... The docking cover is tightly engaged with the inlet and outlet ends of the butterfly valve body. Simultaneously, the sealing ring on one side of the docking cover extends into the butterfly valve body and fits tightly against its inner wall. The sealing ring installed at one end of the external threaded tube inside the moving tube also fits tightly against the inner wall of the moving tube, ensuring a tight seal at the docking point and preventing hydraulic oil leakage. Next, the electric actuator is activated. The output shaft of the electric actuator drives the mounting cover to move laterally. The mounting cover exerts a thrust on the pressure rod, pushing the piston plate laterally within the oil tank. Under the thrust of the piston plate, the hydraulic oil in the tank is pushed into the delivery pipe, and then transported through the delivery pipe to the outlet connected to the delivery pipe. The hydraulic oil is delivered to the butterfly valve body through the threaded pipe, moving pipe, and corresponding mating cover. This hydraulic oil creates a thrust on the valve plate, which remains closed. After the hydraulic oil creates this thrust, the valve plate, which remains sealed, will generate a reverse force through the hydraulic oil. This force is transmitted to the pressure sensor via the piston plate and pressure rod. The pressure sensor detects the pressure on the valve plate and transmits the detected pressure information to the display screen. The display screen shows the pressure value in real time in digital form. The operator can accurately obtain the pressure borne by the butterfly valve body by observing the display screen, thereby measuring the maximum pressure resistance value of the butterfly valve body.

[0013] Beneficial effects: In this utility model, the assembly device for the pressure-resistant double-seal butterfly valve casting can move the moving plate through the moving mechanism and the operating adjustment mechanism. At this time, the clamping plate can be moved closer to the butterfly valve body until the butterfly valve body is clamped and positioned by the clamping plate. Since the connecting pipe and the moving rod are rotatably connected, the valve body of the butterfly valve body can be pre-rotated and supported when assembling the butterfly valve body, so that the valve body of the butterfly valve body can be rotated and adjusted as needed. In this utility model, the assembly device for the pressure-resistant double-seal butterfly valve casting can be adjusted by rotating the handwheel to drive the adjusting screw to rotate. At this time, under the thread transmission action with the threaded plate, the moving plate can be moved, thereby adjusting the lateral position of the clamping plate so that the clamping plate can position and clamp the butterfly valve body. In this invention, the pressure testing device, through a docking mechanism, allows the mounting cover to move laterally by activating an electric push rod. This creates a thrust on the pressure rod, which in turn pushes the piston plate laterally. Under the thrust of the piston plate, hydraulic oil is pushed from the delivery pipe into the docking mechanism connected to the delivery pipe. The hydraulic oil is then delivered to the butterfly valve body, enabling pressure testing of the valve plate of the closed butterfly valve. In this utility model, the pressure measuring device, through the pushing mechanism, can rotate the butterfly valve body to a vertical position and position the butterfly valve body. At this time, two nuts can be rotated respectively. Under the thread transmission action with the corresponding external threaded pipe, the moving pipe can be moved, which can drive the docking cover to approach the butterfly valve body until the butterfly valve body is tightly clamped and docked. Then, the hydraulic oil output from the delivery pipe can be delivered to the butterfly valve body through the external threaded pipe connected to the delivery pipe, as well as the corresponding moving pipe and the docking cover. After the hydraulic oil is delivered to the butterfly valve body, the pressure of the butterfly valve body can be tested. This invention allows for clamping and positioning of the butterfly valve body during assembly, followed by rotational adjustment, providing excellent ease of assembly. Furthermore, after assembly, pressure testing can be performed on the butterfly valve body to fully understand its performance parameters, resulting in superior usability. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of the overall structure and stacking installation structure of the assembly and pressure measuring device for a pressure-resistant double-seal butterfly valve casting proposed in this utility model. Figure 2 This is a three-dimensional schematic diagram of the overall structure of the assembly and pressure measuring device for a pressure-resistant double-seal butterfly valve casting proposed in this utility model. Figure 3This is a schematic diagram of the main cross-sectional structure of the assembly and pressure measuring device for a pressure-resistant double-seal butterfly valve casting proposed in this utility model. Figure 4 A three-dimensional schematic diagram of the support frame, moving plate, clamping plate and adjusting screw connection structure of the assembly device for a pressure-resistant double-seal butterfly valve casting proposed in this utility model; Figure 5 A three-dimensional schematic diagram of the connection structure of the oil tank, electric push rod, display screen and delivery pipe of the pressure measuring device proposed in this utility model; Figure 6 This is a schematic diagram of a butterfly valve structure in the prior art.

[0015] In the diagram: 1. Equipment frame; 2. Support frame; 3. Moving plate; 4. Threaded plate; 5. Adjusting screw; 6. Moving rod; 7. Connecting pipe; 8. Clamping plate; 9. Fixing ring; 10. Mounting ring; 11. Insert rod; 12. Tension spring; 13. External threaded pipe; 14. Moving pipe; 15. Docking cover; 16. Sealing ring; 17. Nut; 18. Butterfly valve body; 19. Oil tank; 20. Conveying pipe; 21. Electric push rod; 22. Mounting cover; 23. Pressure rod; 24. Piston plate; 25. Pressure sensor; 26. Display screen. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] In one embodiment: Refer to Figure 1-6 An assembly device includes an equipment frame 1. Support frames 2 are fixedly installed on the inner walls of both sides of the equipment frame 1. A moving mechanism is connected inside the support frame 2. One side of the moving mechanism passes through the outer side of the support frame 2 and is fitted with a clamping plate 8. The same butterfly valve body 18 is clamped between the two clamping plates 8. An adjusting mechanism is connected to the moving mechanism. Two adjusting mechanisms pass through the corresponding inner wall of the equipment frame 1 and extend to the outer side of the equipment frame 1. The adjusting mechanisms are connected to the equipment frame 1.

[0018] The moving mechanism includes a support frame 2 fixedly installed on the inner wall of one side of the equipment rack 1. A moving plate 3 is slidably connected inside the support frame 2. A moving rod 6 is fixedly installed on one side of the moving plate 3. One end of the moving rod 6 passes through the inner wall of one side of the support frame 2 and extends into the equipment rack 1. It also includes a connecting pipe 7 fixedly installed on one side of the clamping plate 8. One end of the moving rod 6 extends into the connecting pipe 7 and is rotatably connected to the inner wall of the connecting pipe 7. An adjusting mechanism is connected to the top of the moving plate 3. By operating the adjusting mechanism, the moving plate 3 can be moved. At this time, the clamping plate 8 can be moved closer to the butterfly valve body 18 until the butterfly valve body 18 is clamped and positioned by the clamping plate 8. Since the connecting pipe 7 and the moving rod 6 are rotatably connected, the valve body of the butterfly valve body 18 can be pre-rotated and supported when assembling the butterfly valve body 18, so that the valve body of the butterfly valve body 18 can be rotated and adjusted as needed.

[0019] This application can be used in the field of valve manufacturing technology, or in other fields applicable to this application.

[0020] In another embodiment: Reference Figure 1-6 Based on the above embodiments, an improvement is made: an assembly device for a pressure-resistant double-seal butterfly valve casting, which is applied to the field of valve manufacturing technology. A fixing ring 9 located inside the equipment frame 1 is fixedly fitted onto the moving rod 6. An installation ring 10 is fixedly fitted onto the connecting pipe 7. A sliding insertion rod 11 is slidably connected through the installation ring 10. An insertion hole is provided on the fixing ring 9. The insertion rod 11 passes through the insertion hole and is movably engaged with it. A tension spring 12 is fitted onto the insertion rod 11. Both ends of the tension spring 12 are respectively connected to the installation ring 10 via hooks provided at both ends. One side of the mounting ring 10 is fixedly connected to one end of the insertion rod 11. After the butterfly valve body 18 is rotated to the vertical position, the insertion rod 11 can be aligned with the insertion hole. Then the insertion rod 11 can be released, and the tension spring 12 under stress can pull the insertion rod 11 to move, so that the insertion rod 11 can be automatically inserted into the insertion hole, thereby positioning the connecting pipe 7 and further positioning the butterfly valve body 18. This ensures that the butterfly valve body 18 remains in a stable position and does not change during subsequent pressure testing.

[0021] The adjustment mechanism includes an adjusting screw 5 that penetrates one inner wall of the equipment frame 1 and is rotatably connected to one inner wall of the equipment frame 1. One end of the adjusting screw 5 located inside the equipment frame 1 is rotatably connected to the top of the support frame 2. A handwheel is fixedly installed at the other end of the adjusting screw 5 located outside the equipment frame 1. A threaded plate 4 is fixedly installed on the top of the moving plate 3. The adjusting screw 5 penetrates the threaded plate 4 and is threadedly connected to the threaded plate 4. By rotating the handwheel, the adjusting screw 5 is rotated. At this time, under the threaded transmission action with the threaded plate 4, the moving plate 3 can be moved, thereby adjusting the lateral position of the clamping plate 8 so that the clamping plate 8 can position and clamp the butterfly valve body 18.

[0022] A pressure measuring device, applied to the assembly device of the aforementioned pressure-resistant double-seal butterfly valve casting, includes an oil tank 19 fixedly installed on an equipment frame 1. The oil tank 19 contains hydraulic oil. A pushing mechanism is installed on one side of the oil tank 19. One side of the pushing mechanism extends into the oil tank 19 and fits tightly against the inner wall of the oil tank 19. Two docking mechanisms are symmetrically connected through the equipment frame 1. The sides of the two docking mechanisms that are close to each other are respectively clamped to the inlet end and outlet end of the butterfly valve body 18. A delivery pipe 20 is fixedly installed through one side of the inner wall of the oil tank 19. The hydraulic oil is located between the delivery pipe 20 and the pushing mechanism. The top end of the delivery pipe 20 is connected to the docking mechanism located on one side.

[0023] The actuating mechanism includes an electric push rod 21 fixedly installed on one side of the oil tank 19. The output shaft of the electric push rod 21 extends into the oil tank 19 and is fixedly installed with a mounting cover 22. A pressure rod 23 is slidably connected inside the mounting cover 22. One end of the pressure rod 23 extends into the mounting cover 22 and is fixedly installed with a piston plate 24. The piston plate 24 is tightly fitted with the inner wall of the oil tank 19 and is used to push hydraulic oil into the delivery pipe 20. By activating the electric push rod 21, the mounting cover 22 is moved laterally, which generates a thrust on the pressure rod 23, thereby pushing the piston plate 24 to move laterally. Under the thrust of the piston plate 24, hydraulic oil can be pushed from the delivery pipe 20 into the docking mechanism connected to the delivery pipe 20. Then, the hydraulic oil can be delivered to the butterfly valve body 18, thereby enabling pressure testing of the valve plate of the butterfly valve body 18, which is kept closed.

[0024] A pressure sensor 25 is fixedly installed on the inner wall of one side of the mounting cover 22, and a display screen 26 is fixedly installed on the outer side of the oil tank 19. The display screen 26 is electrically connected to the pressure sensor 25. When the mounting cover 22 moves and drives the pressure rod 23 to move, the hydraulic oil forms a thrust on the valve plate. At this time, the valve plate, which is kept sealed, can form a reverse force through the hydraulic oil, which can exert pressure on the pressure sensor 25 through the piston plate 24 and the pressure rod 23. Thus, when the butterfly valve body 18 is pressure tested, the pressure sensor 25 can detect the pressure on the valve plate and transmit the detected pressure information to the display screen 26. The display screen 26 can display the pressure value in digital form so as to accurately measure the maximum pressure resistance value of the butterfly valve body 18.

[0025] The docking mechanism includes an externally threaded pipe 13 that penetrates the inner wall of the equipment frame 1 and is fixedly connected to the inner wall of the equipment frame 1. A movable pipe 14 is fitted onto the externally threaded pipe 13. A sealing ring 16 is fixedly installed at one end of the externally threaded pipe 13 inside the movable pipe 14. The sealing ring 16 is tightly fitted to the inner wall of the movable pipe 14. A docking cover 15 is fixedly installed at one end of the movable pipe 14. The docking covers 15 located on the two docking mechanisms are respectively tightly engaged with the inlet and outlet ends of the butterfly valve body 18. A sealing ring 16 is also fixedly installed on one side of the inner wall of the docking cover 15. One side of the sealing ring 16 extends into the butterfly valve body 18 and is tightly fitted to the inner wall of the butterfly valve body 18. A nut 17 is rotatably connected to the other end of the movable pipe 14. The externally threaded pipe 13 passes through the nut 17 and is tightly fitted to the screw. The female 17 is threadedly connected, and the top end of the delivery pipe 20 is fixedly connected to one end of the external threaded pipe 13 located on one side. After the butterfly valve body 18 is rotated to a vertical position and positioned, the two nuts 17 can be rotated respectively. Under the threaded transmission action with the corresponding external threaded pipe 13, the moving pipe 14 can be moved, which can drive the docking cover 15 to approach the butterfly valve body 18 until the butterfly valve body 18 is tightly clamped and docked. Then, the hydraulic oil output from the delivery pipe 20 can be delivered to the butterfly valve body 18 through the external threaded pipe 13 connected to the delivery pipe 20, as well as the corresponding moving pipe 14 and docking cover 15. After the hydraulic oil is delivered to the butterfly valve body 18, the butterfly valve body 18 can be pressure tested.

[0026] However, as is well known to those skilled in the art, the working principles and wiring methods of the electric actuator 21, pressure sensor 25, and display screen 26 are commonplace and are all conventional methods or common knowledge. They will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0027] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An assembly device for a pressure-resistant double-seal butterfly valve casting, characterized in that, The equipment includes a frame (1), a support frame (2) is symmetrically fixed to the inner walls of both sides of the frame (1) by bolts, a movable plate (3) is slidably connected inside the support frame (2), a movable rod (6) is fixedly installed on one side of the movable plate (3), one end of the movable rod (6) extends into the frame (1), and a threaded plate (4) is fixedly installed on the top of the movable plate (3). The inner wall of one side of the equipment frame (1) is rotatably connected to the adjusting screw (5). One end of the adjusting screw (5) is rotatably connected to the top of the support frame (2), and the other end is fixedly installed with a handwheel. The adjusting screw (5) passes through the threaded plate (4) and is threadedly connected to the threaded plate (4). One end of the moving rod (6) extends into the connecting pipe (7) and is rotatably connected to the inner wall of the connecting pipe (7). The connecting pipe (7) is fixedly installed on one side of the clamping plate (8). The butterfly valve body (18) is clamped between the two clamping plates (8). When assembling the butterfly valve body (18), the adjusting screw (5) is rotated by turning the handwheel. Under the action of the threaded transmission, the threaded plate (4) drives the moving plate (3) to move, so that the clamping plate (8) clamps and positions the butterfly valve body (18). Since the connecting pipe (7) is rotatably connected to the moving rod (6), the valve body of the butterfly valve body (18) can be rotated and adjusted.

2. The assembly device for the pressure-resistant double-seal butterfly valve casting according to claim 1, characterized in that, The moving rod (6) is fixedly fitted with a fixed ring (9) located inside the equipment frame (1), and the connecting pipe (7) is fixedly fitted with an installation ring (10). The installation ring (10) is fitted with a sliding connecting rod (11). The fixed ring (9) has an insertion hole. The rod (11) passes through the insertion hole and is movably locked with the insertion hole. A tension spring (12) is fitted on the rod (11). The two ends of the tension spring (12) are fixedly connected to one side of the installation ring (10) and one end of the rod (11) respectively by pull hooks. After the butterfly valve body (18) is rotated to the vertical position, the rod (11) is released. The tension spring (12) pulls the rod (11) to insert into the insertion hole, positioning the connecting pipe (7) so that the butterfly valve body (18) maintains a stable position during pressure detection.

3. A pressure measuring device, used in the assembly device of the pressure-resistant double-seal butterfly valve casting as described in claim 1 or 2, characterized in that, The equipment includes an oil tank (19) fixedly installed on the equipment frame (1), which contains hydraulic oil. A push mechanism is installed on one side of the oil tank (19), and one side of the push mechanism extends into the oil tank (19) and fits tightly against the inner wall of the oil tank (19). Two docking mechanisms are symmetrically connected through the equipment frame (1). The two docking mechanisms are close to each other and clamped to the inlet and outlet of the butterfly valve body (18) respectively. A delivery pipe (20) is fixedly installed through the inner wall of one side of the oil tank (19). The hydraulic oil is located between the delivery pipe (20) and the push mechanism. The top of the delivery pipe (20) is connected to the docking mechanism located on one side. The hydraulic oil is delivered to the butterfly valve body (18) through the delivery pipe (20) and the docking mechanism by the push mechanism, and the butterfly valve body (18) is pressure tested.

4. The pressure measuring device according to claim 3, characterized in that, The pushing mechanism includes an electric push rod (21) fixedly installed on one side of the oil tank (19). The output shaft of the electric push rod (21) extends into the oil tank (19) and is fixedly installed in the mounting cover (22). A pressure rod (23) is slidably connected inside the mounting cover (22). One end of the pressure rod (23) extends into the mounting cover (22) and is fixedly installed in the piston plate (24). The piston plate (24) is tightly fitted to the inner wall of the oil tank (19). The electric push rod (21) is activated to drive the mounting cover (22) to move laterally, which pushes the piston plate (24) to move laterally, pushing the hydraulic oil from the delivery pipe (20) into the docking mechanism, and then delivering it into the butterfly valve body (18) for pressure testing.

5. The pressure measuring device according to claim 4, characterized in that, A pressure sensor (25) is fixedly installed on the inner wall of one side of the mounting cover (22), and a display screen (26) is fixedly installed on the outside of the oil tank (19). The display screen (26) is electrically connected to the pressure sensor (25). After the hydraulic oil forms a thrust on the valve plate of the butterfly valve body (18), the valve plate forms a reverse force through the hydraulic oil, which acts on the pressure sensor (25) through the piston plate (24) and the pressure rod (23). The pressure sensor (25) transmits the pressure information to the display screen (26) for display, so as to accurately measure the maximum pressure resistance value of the butterfly valve body (18).

6. The pressure measuring device according to claim 4, characterized in that, The docking mechanism includes an externally threaded pipe (13) that penetrates the inner wall of the equipment frame (1) and is fixedly connected to the inner wall of the equipment frame (1). A movable pipe (14) is fitted onto the externally threaded pipe (13). A sealing ring (16) is fixedly installed at one end of the externally threaded pipe (13) inside the movable pipe (14). The sealing ring (16) is tightly fitted to the inner wall of the movable pipe (14). A docking cover (15) is fixedly installed at one end of the movable pipe (14). The docking covers (15) on the two docking mechanisms are tightly engaged with the inlet and outlet ends of the butterfly valve body (18) respectively. A sealing ring (16) is also fixedly installed on one side of the inner wall of the docking cover (15). Extending into the butterfly valve body (18) and tightly fitting the inner wall of the butterfly valve body (18), the other end of the moving tube (14) is rotatably connected to the nut (17), the external threaded tube (13) passes through the nut (17) and is threadedly connected to the nut (17), and the top end of the delivery tube (20) is fixedly connected to one end of the external threaded tube (13) located on one side; after rotating the butterfly valve body (18) to a vertical position and positioning it, rotate the nut (17), and under the action of threaded transmission, the moving tube (14) drives the docking cover (15) to approach the butterfly valve body (18) to achieve tight clamping docking, so that hydraulic oil can be delivered to the butterfly valve body (18) for pressure testing.

7. The assembly device for the pressure-resistant double-seal butterfly valve casting according to claim 2, characterized in that, The support frame (2) is a U-shaped channel steel with a longitudinal groove inside. The moving plate (3) is embedded in the groove to achieve longitudinal sliding. The U-shaped channel steel support frame (2) and the longitudinal groove provide a stable sliding track for the moving plate (3), ensuring that the moving plate (3) moves accurately and that the clamping plate (8) can accurately clamp the butterfly valve body (18).

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