A ball valve air tightness automatic detection device

Abstract

The present invention relates to the technical field of ball valve air tightness detection accessory devices, and in particular to an automatic ball valve air tightness detection device, comprising a frame, a clamping mechanism for fixing the ball valve, a toggle mechanism for toggling a handle of the ball valve, a detection mechanism, and a PLC controller for controlling the clamping mechanism, the toggle mechanism and the detection mechanism, the clamping mechanism comprising a support seat, a fixed tooling end, a movable tooling end and a clamping cylinder for driving the movable tooling end, the detection mechanism comprising a confluence seat, a direct pressure transmitter, a micro-differential pressure transmitter, an intake pipeline, an intake control valve, an exhaust pipeline, an exhaust control valve, a high-pressure pipe, a low-pressure pipe, a high-pressure valve, a low-pressure valve, a fixed air path, a movable air path, a fixed control valve and a movable control valve; the device is easy to operate, only needs one clamping to complete all the detections, the detection modes are diversified, the inspection efficiency and inspection accuracy are improved, and the safety hazards are reduced, and the inspection cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of ball valve air tightness detection accessory devices, in particular to a ball valve air tightness automatic detection device. Background Art

[0002] During the manufacturing process of ball valves, the finished ball valves are tested for air tightness according to product standards. At present, the air tightness of ball valves is usually tested using an immersion air tightness test press. Personnel operate the immersion air tightness test press, rotate the ball of the ball valve product to a half-open position, inflate it with the specified air pressure, and immerse the product in water in the inflated state to observe whether bubbles are generated or seeping out, so as to determine whether there is leakage in the ball valve shell, and then rotate the ball valve to the fully closed position to seal the middle cavity of the ball valve with air and maintain pressure, and then immerse the product in water again to observe whether there is air bubble leakage at both ends of the ball valve, so as to determine whether the air tightness of the valve is qualified.

[0003] The existing ball valve air tightness testing equipment mainly operates and judges by personnel operation and observation of bubbles during the process. The operation process requires the hand-held ball valve product to be positioned and clamped by the cylinder ejector, which poses certain safety risks; and during the first step of shell testing, the back of the product cannot be directly observed when the product is clamped and positioned on the equipment; during the second step of the middle cavity sealing and pressure maintenance test, the product needs to be sealed in the middle cavity and then taken out and immersed in another water tank to observe the leakage on the inside of both ends of the product. During the entire testing process, personnel must observe whether there is leakage in various parts of the product and whether there is micro-bubble seepage. Micro-leakage may be missed; the inspection process is cumbersome and the inspection efficiency is low; and because it is an immersion air tightness test, the subsequent process of blowing and cleaning the ball valve is derived, and the additional operations under this original operation mode increase the manufacturing cost. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides an automatic ball valve air tightness detection device which is easy to operate, can complete all detections with just one clamping, has diversified detection modes, improves inspection efficiency and inspection accuracy, reduces safety hazards, and reduces detection costs.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic detection device for the air tightness of a ball valve, comprising a frame, a clamping mechanism for fixing the ball valve, a toggle mechanism for toggling the handle of the ball valve, a detection mechanism, and a PLC controller for controlling the clamping mechanism, the toggle mechanism and the detection mechanism, the clamping mechanism comprising a support seat, a fixed tooling end, a movable tooling end and a clamping cylinder for driving the movable tooling end, the fixed tooling end is fixedly installed on the top of the support seat and is opposite to the movable tooling end front and back, and sealing grooves are provided on the opposite sides of the fixed tooling end and the movable tooling end, the detection mechanism comprises a confluence seat, a direct pressure transmitter and a micro-differential pressure transmitter, and the confluence seat is provided with a A cavity, an air intake pipeline is arranged at one end of the confluence seat, and an air intake control valve is arranged on the air intake pipeline, an exhaust pipeline is arranged at the other end of the confluence seat, and an exhaust control valve is arranged on the exhaust pipeline, the detection end of the direct pressure transmitter is communicated with the cavity, a high-pressure pipe and a low-pressure pipe which are respectively communicated with the high-pressure cavity and the low-pressure cavity are arranged on the micro-differential pressure transmitter, the high-pressure pipe and the low-pressure pipe are both communicated with the confluence seat, and a high-pressure valve and a low-pressure valve are respectively arranged on the high-pressure pipe and the low-pressure pipe, a fixed air circuit and a movable air circuit are connected on the confluence seat, the fixed air circuit and the movable air circuit are respectively communicated with the sealing grooves of the fixed tooling end and the movable tooling end, and a fixed control valve and a movable control valve are respectively arranged on the fixed air circuit and the movable air circuit.

[0008] Preferably, the toggle mechanism includes a fixed seat, a lifting cylinder, a motor seat, a connecting plate and a connecting rod. The fixed seat is fixedly mounted on the frame, and a vertical linear slide rail is arranged at the front end of the fixed seat, a slider is slidably arranged on the linear slide rail, the motor seat is mounted on the slider, and a servo motor is mounted on the motor seat, an eccentric lever for toggling the handle of the ball valve is arranged at the bottom output end of the servo motor, the lifting cylinder is mounted on the fixed seat, the top output end of the lifting cylinder is connected to the connecting plate, the bottom end of the connecting rod is connected to the motor seat, and the top end of the connecting rod is connected to the connecting plate.

[0009] Preferably, a limiting plate is provided at the top end of the fixing seat, a limiting hole is provided on the limiting plate, and the top end of the connecting rod passes through the limiting hole and is connected to the connecting plate.

[0010] Preferably, sealing gaskets are provided on the opposing surfaces of the fixed tooling end and the movable tooling end.

[0011] Preferably, the input end of the air intake pipeline is connected to a pressure pump, and an air pressure detector is provided on the air intake pipeline.

[0012] (III) Beneficial effects

[0013] Compared with the prior art, the present invention provides an automatic ball valve air tightness detection device, which has the following beneficial effects:

[0014] 1. The ball valve air tightness automatic detection equipment places the ball valve on the fixed tooling end and the movable tooling end for clamping, and uses the toggle mechanism to toggle the handle of the ball valve to the half-open position. Only the air intake control valve is in the closed state. First, close the exhaust air valve, open the air intake control valve for inflation, and then close the air intake control valve for air sealing. Close the high-pressure valve, and seal the high-pressure chamber of the micro-differential pressure transmitter. At the same time, read the 1st data of the direct pressure transmitter and the micro-differential pressure transmitter through direct pressure scanning and differential pressure scanning. After reaching the set direct pressure detection delay time, read the 2nd data of the direct pressure transmitter and compare it with the 1st data of the direct pressure transmitter to determine the air tightness of the shell for detection. If qualified, continue to delay to the set differential pressure detection delay time, read the 2nd data of the micro-differential pressure transmitter, and compare it with the 1st differential pressure data for pressure drop detection to complete the shell sealing detection; then deflate all the air and close the valve. Exhaust control valve, open the air intake control valve for inflation, close the air intake control valve to seal the air intake, close the handle of the ball valve to close the middle cavity and maintain pressure, open the exhaust valve to completely deflate, close the low-pressure valve to seal the low-pressure cavity of the micro-differential pressure transmitter, open the exhaust control valve to exhaust, and at the same time read the first data of the direct pressure transmitter and the micro-differential pressure transmitter, reach the set direct pressure detection delay time, read the second direct pressure data, compare the first and second direct pressure data to make a leakage judgment, and continue to delay to the set differential pressure detection delay time if qualified, read the second differential pressure data, compare the first and second differential pressure data, make a pressure rise judgment, complete the middle cavity detection, open the ball valve handle to deflate, release the residual pressure in the middle cavity, read the third direct pressure and differential pressure data, compare with the residual pressure setting value, make a residual pressure value judgment, complete the residual pressure detection, and finally inflate the middle cavity of the ball valve again, close and maintain pressure, and completely deflate.

[0015] 2. The ball valve air tightness automatic detection equipment is easy to operate. It only needs one clamping to complete the ball valve shell air tightness detection, ball valve middle cavity air tightness detection and residual pressure detection. The detection mode is diversified, which improves the inspection efficiency and inspection accuracy, reduces safety hazards and reduces the inspection cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the detection mechanism of the present invention;

[0018] Figure 3 It is a three-dimensional structural schematic diagram of the movable tooling end of the present invention;

[0019] Markings in the attached figure: 1. rack; 2. PLC controller; 3. support seat; 4. fixed tooling end; 5. movable tooling end; 6. clamping cylinder; 7. confluence seat; 8. direct pressure transmitter; 9. micro differential pressure transmitter; 10. intake pipe; 11. intake control valve; 12. exhaust pipe; 13. exhaust control valve; 14. high-pressure pipe; 15. low-pressure pipe; 16. high-pressure valve; 17. low-pressure valve; 18. fixed air path; 19. movable air path; 20. fixed control valve; 21. movable control valve; 22. fixed seat; 23. lifting cylinder; 24. motor seat; 25. connecting plate; 26. connecting rod; 27. linear guide rail; 28. slider; 29. ​​servo motor; 30. eccentric lever; 31. limit plate; 32. sealing gasket; 33. air pressure detector. DETAILED DESCRIPTION

[0020] 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.

[0021] See also Figure 1-3The present invention provides an automatic detection device for air tightness of a ball valve, comprising a frame 1, a clamping mechanism for fixing the ball valve, a toggle mechanism for toggling the handle of the ball valve, a detection mechanism, and a PLC controller for controlling the clamping mechanism, the toggle mechanism, and the detection mechanism. The clamping mechanism comprises a support seat 3, a fixed tooling end 4, a movable tooling end 5, and a clamping cylinder 6 for driving the movable tooling end 5. The fixed tooling end 4 is fixedly mounted on the top of the support seat 3 and is opposite to the movable tooling end 5 front and back, and a sealing groove is provided on the opposite side of the fixed tooling end 4 and the movable tooling end 5. The detection mechanism comprises a confluence seat 7, a direct pressure transmitter 8, and a micro differential pressure transmitter 9. The confluence seat 7 A cavity is provided inside, an intake pipeline 10 is provided at one end of the confluence seat 7, and an intake control valve 11 is provided on the intake pipeline 10, an exhaust pipeline 12 is provided at the other end of the confluence seat 7, and an exhaust control valve 13 is provided on the exhaust pipeline 12, the detection end of the direct pressure transmitter 8 is communicated with the cavity, the micro-differential pressure transmitter 9 is provided with a high-pressure pipe 14 and a low-pressure pipe 15 respectively connected to the high-pressure cavity and the low-pressure cavity, the high-pressure pipe 14 and the low-pressure pipe 15 are both connected to the confluence seat 7, and a high-pressure valve 16 and a low-pressure valve 17 are respectively provided on the high-pressure pipe 14 and the low-pressure pipe 15, a fixed gas path 18 and a movable gas path 19 are connected on the confluence seat 7, and the fixed gas path 18 and the movable gas path 19 are respectively connected to the sealing grooves of the fixed tooling end 4 and the movable tooling end 5, and a fixed control valve 20 and a movable control valve 21 are respectively arranged on the fixed gas circuit 18 and the movable gas circuit 19, the toggle mechanism includes a fixed seat 22, a lifting cylinder 23, a motor seat 24, a connecting plate 25 and a connecting rod 26, the fixed seat 22 is fixedly installed on the frame 1, and a vertical linear slide rail 27 is arranged at the front end of the fixed seat 22, a slider 28 is slidably arranged on the linear slide rail 27, the motor seat 24 is installed on the slider 28, and a servo motor 29 is installed on the motor seat 24, and an eccentric lever 3 for toggling the handle of the ball valve is arranged at the bottom output end of the servo motor 29 0, the lifting cylinder 23 is installed on the fixed seat 22, the top output end of the lifting cylinder 23 is connected to the connecting plate 25, the bottom end of the connecting rod 26 is connected to the motor seat 24, the top end of the connecting rod 26 is connected to the connecting plate 25, and a limiting plate 31 is provided at the top of the fixed seat 22. A limiting hole is provided on the limiting plate 31, and the top end of the connecting rod 26 passes through the limiting hole and is connected to the connecting plate 25; the motor seat 24 is driven up and down by the lifting cylinder 23 electric connecting plate 25, and the connecting plate 25 drives the motor seat 24 up and down through the connecting rod 26, and the stability of the motor seat 24 is ensured by the cooperation of the linear slide rail 27 and the slider 28, and the servo motor 29 drives the eccentric lever 30 to rotate to realize the shifting of the ball valve handle.

[0022] The opposite surfaces of the fixed tooling end 4 and the movable tooling end 5 are both provided with sealing gaskets 32, and the sealing between the fixed tooling end 4, the movable tooling end 5 and the ball valve to be tested is ensured by the sealing gaskets.

[0023] The input end of the air intake pipeline 10 is connected to a pressure pump, and an air pressure detector 33 is provided on the air intake pipeline 10. The pressure pump is used to provide an air source, and the air pressure detector 33 is used to control the intake air pressure.

[0024] When in use, place the ball valve on the fixed tooling end 4 and the movable tooling end 5 for clamping, and use the toggle mechanism to toggle the handle of the ball valve to a half-open position, so that only the air intake control valve 11 is in a closed state. First, close the exhaust air valve, open the air intake control valve 11 for inflation, and then close the air intake control valve 11 for sealing. Close the high-pressure valve 16 to seal the high-pressure chamber of the micro-differential pressure transmitter 9. At the same time, read the first data of the direct pressure transmitter 8 and the micro-differential pressure transmitter 9 through direct pressure scanning and differential pressure scanning. After reaching the set direct pressure detection delay time, read the second data of the direct pressure transmitter 8 and compare it with the first data of the direct pressure transmitter 8 to determine the air tightness of the shell for detection. If qualified, continue to delay to the set differential pressure detection delay time, read the second data of the micro-differential pressure transmitter 9, and compare it with the first differential pressure data for pressure drop detection to complete the shell sealing detection. Then, release all the air, close the exhaust control valve 13, open the air intake control valve 11 to inflate, close the air intake control valve 11 to seal the air intake, close the handle of the ball valve to close the middle cavity to maintain pressure, open the exhaust valve to release all the air, close the low-pressure valve 17 to seal the low-pressure cavity of the micro-differential pressure transmitter 9, open the exhaust control valve 13 to exhaust, and at the same time read the first data of the direct pressure transmitter 8 and the micro-differential pressure transmitter 9, reach the set direct pressure detection delay time, read the second direct pressure data, compare the first and second direct pressure data to judge the leakage, and continue to delay to the set differential pressure detection if qualified. Delay time, read the second differential pressure data, compare the first and second differential pressure data, make a pressure rise judgment, complete the middle cavity detection, open the ball valve handle to deflate, release the residual pressure in the middle cavity, read the third direct pressure and differential pressure data, compare with the residual pressure set value, make a residual pressure value judgment, complete the residual pressure detection, finally inflate the middle cavity of the ball valve again and then close it to maintain pressure, and deflate all the air. Only one clamping is required to complete the ball valve shell air tightness detection, the ball valve middle cavity air tightness detection and the residual pressure detection. The detection modes are diversified, the inspection efficiency and inspection accuracy are improved, and the safety hazards and detection costs are reduced.

[0025] 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.

[0026] It should be noted that in this case, the clamping mechanism, the toggle mechanism and the detection mechanism are all controlled by the PLC controller, and the direct pressure detection delay time and the pressure difference detection delay time are set by the PLC controller.

[0027] The electrical components mentioned in this article are all connected to an external main controller and 220V mains electricity, and the main controller can be a conventional known device for controlling a computer or the like.

[0028] 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 ball valve air tightness automatic detection device, characterized in that: The invention comprises a frame (1), a clamping mechanism for fixing a ball valve, a toggle mechanism for toggling a handle of the ball valve, a detection mechanism, and a PLC controller (2) for controlling the clamping mechanism, the toggle mechanism, and the detection mechanism. The clamping mechanism comprises a support seat (3), a fixed tooling end (4), a movable tooling end (5), and a clamping cylinder (6) for driving the movable tooling end (5). The fixed tooling end (4) is fixedly mounted on the top of the support seat (3) and is opposite to the movable tooling end (5) in front and back. A sealing groove is provided on the opposite side of the fixed tooling end (4) and the movable tooling end (5). The detection mechanism comprises a confluence seat (7), a direct pressure transmitter (8), and a micro-differential pressure transmitter (9). A cavity is provided inside the confluence seat (7). An air intake pipeline (10) is provided at one end of the confluence seat (7). The input end of the air intake pipeline (10) is connected to a pressure pump, and an air intake valve (10) is provided on the air intake pipeline (10). The gas control valve (11) is provided at the other end of the confluence seat (7) with an exhaust pipeline (12), and an exhaust control valve (13) is provided on the exhaust pipeline (12). The detection end of the direct pressure transmitter (8) is communicated with the cavity. The micro-differential pressure transmitter (9) is provided with a high-pressure pipe (14) and a low-pressure pipe (15) which are respectively communicated with the high-pressure cavity and the low-pressure cavity. The high-pressure pipe (14) and the low-pressure pipe (15) are both communicated with the confluence seat (7), and the high-pressure pipe (14) and the low-pressure pipe (15) are connected to the confluence seat (7). A high-pressure valve (16) and a low-pressure valve (17) are respectively provided on the high-pressure pipe (14) and the low-pressure pipe (15), and a fixed gas path (18) and a movable gas path (19) are connected to the manifold seat (7), wherein the fixed gas path (18) and the movable gas path (19) are respectively connected to the sealing grooves of the fixed tooling end (4) and the movable tooling end (5), and a fixed control valve (20) and a movable control valve (21) are respectively provided on the fixed gas path (18) and the movable gas path (19); The toggle mechanism comprises a fixed seat (22), a lifting cylinder (23), a motor seat (24), a connecting plate (25) and a connecting rod (26); the fixed seat (22) is fixedly mounted on the frame (1), and a vertical linear slide rail (27) is provided at the front end of the fixed seat (22); a slider (28) is slidably provided on the linear slide rail (27); the motor seat (24) is mounted on the slider (28), and a servo motor (29) is mounted on the motor seat (24); an eccentric toggle rod (30) for toggling the handle of the ball valve is provided at the bottom output end of the servo motor (29); the lifting cylinder (23) is mounted on the fixed seat (22), and the top output end of the lifting cylinder (23) is connected to the connecting plate (25); the bottom end of the connecting rod (26) is connected to the motor seat (24), and the top end of the connecting rod (26) is connected to the connecting plate (25); A limiting plate (31) is provided at the top end of the fixing seat (22), a limiting hole is provided on the limiting plate (31), and the top end of the connecting rod (26) passes through the limiting hole and is connected to the connecting plate (25).

2. The ball valve air tightness automatic detection device according to claim 1 is characterized in that: The opposing surfaces of the fixed tooling end (4) and the movable tooling end (5) are both provided with sealing gaskets (32).

3. The ball valve air tightness automatic detection device according to claim 1 is characterized in that: An air pressure detector (33) is provided on the air intake pipeline (10).

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