An airtightness detection device for valves

Abstract

The present application discloses an airtightness detection device for a valve, which includes a water tank and a lifting base arranged in the water tank. A clamping cylinder and a transmission mechanism are provided on the lifting base. There are two clamping cylinders, and the ports of the two clamping cylinders face each other and are both slidably arranged on the lifting base. The two clamping cylinders clamp or loosen the valve to be tested under the action of the transmission mechanism; a water hammer mechanism is provided on the clamping cylinder, and the water hammer mechanism includes a first plug disk slidably arranged in the clamping cylinder, a first compression spring connected between the first plug disk and the bottom of the clamping cylinder, and a limiting component. The limiting component is used to limit the movement of the first plug disk; when the clamping cylinder clamps the valve to be tested, the valve to be tested is placed into the water tank, the limitation of the limiting component on the first plug disk is cancelled, and the airtightness of the valve is detected by observing whether there are bubbles emerging from the valve. The present application can conduct a more comprehensive airtightness detection on the valve, thereby reducing the waste of valves caused by the damage of the valve due to the water hammer effect.

Description

Technical Field

[0001] The present invention relates to the technical field of valve airtightness detection, and particularly relates to an airtightness detection device for valves. Background Art

[0002] A valve is a device or equipment used to control, regulate, and stop the flow of fluids (such as gases, liquids, steam, etc.). By opening or closing the valve, the flow of the fluid can be switched on or off, and the flow rate, pressure, or temperature of the fluid can also be controlled by adjusting the opening degree of the valve. Therefore, the sealing performance of the valve is crucial. At this time, a valve airtightness detection device will be used.

[0003] The existing Chinese patent with the publication number CN117782445B and the name "An Airtightness Detection Device for Valves" describes an airtightness detection device for valves, which includes a detection table provided with a storage pool and a fixing mechanism for fixing the valve. An air inlet unit is arranged in the fixing mechanism, and the air inlet unit is used to inflate the valve to be detected. The valve to be detected after inflation will be sent to the storage pool, and the airtightness of the valve is detected by observing the bubbles in the storage pool.

[0004] When the above-mentioned patented technical solution detects the airtightness of the valve, the air inlet unit inflates the valve gradually and cannot detect the airtightness of the valve under the water hammer effect. If the valve that passes the detection of the existing airtightness detection device fails due to too large impact force inside the valve when the water hammer effect occurs during use, the airtightness of the valve may fail, resulting in waste of the valve. Therefore, in order to avoid waste of the valve and to conduct a more comprehensive airtightness detection of the valve, there is an urgent need for a device that can detect the airtightness of the valve by simulating the water hammer effect. Summary of the Invention

[0005] The present invention provides an airtightness detection device for valves, which can conduct a more comprehensive airtightness detection of the valves, thereby reducing the waste of valves caused by valve damage due to the water hammer effect.

[0006] The following technical solutions are adopted for the airtightness detection device for valves of the present invention:

[0007] An airtightness detection device for valves includes a water tank and a lifting base arranged in the water tank. A clamping cylinder and a transmission mechanism are provided on the lifting base. There are two clamping cylinders, and both clamping cylinders are slidably arranged on the lifting base, and the ports of the two clamping cylinders are arranged opposite to each other. The two clamping cylinders clamp or loosen the valve to be detected under the action of the transmission mechanism;

[0008] A water hammer mechanism is provided on the clamping cylinder. The water hammer mechanism includes a first plug, a first compression spring, and a limiting component. The first plug is slidably disposed within the clamping cylinder. The first compression spring is connected between the first plug and the bottom of the clamping cylinder. The limiting component is used to limit the movement of the first plug.

[0009] When the clamping cylinder clamps the valve to be tested, the clamped valve to be tested is placed into the water tank, the limitation of the limiting component on the first plug is cancelled, and the air tightness of the valve is detected by observing whether there are bubbles emerging from the valve.

[0010] Further, the limiting component includes a slide bar and an electric cylinder. The slide bar is fixed on one side of the first plug facing the first compression spring. The electric cylinder is installed on the lifting base. The electric cylinder is located on the side of the clamping cylinder away from the valve to be tested. The slide bar penetrates through the clamping cylinder and is connected to the output shaft of the electric cylinder.

[0011] Further, a reinforcement hole is provided on the rod body of the slide bar extending out of the clamping cylinder. The output shaft of the electric cylinder passes through the reinforcement hole.

[0012] Further, the transmission mechanism includes two transmission units and a motor. The motor is installed on the lifting base. The two clamping cylinders are symmetrically arranged with respect to the motor. The two transmission units are centrosymmetrically arranged with respect to the center of the output shaft of the motor. The two transmission units respectively correspond to the two clamping cylinders.

[0013] The transmission unit includes a first rack, a second rack, and a telescopic shaft. A gear is installed on the output shaft of the motor. The first rack and the second rack are both slidably disposed on the lifting base. The first rack meshes with the gear. A sealing groove is provided on the first rack. A sealing block is fixed on the second rack. The sealing block is inserted into the sealing groove to achieve the sliding connection between the first rack and the second rack. The telescopic shaft is fixed at one end of the second rack away from the first rack. A connecting plate is connected to one end of the telescopic shaft away from the second rack. A second compression spring is sleeved on the telescopic shaft. The two ends of the second compression spring are respectively connected to the connecting plate and the second rack. The clamping cylinder is disposed on the corresponding connecting plate and can move synchronously with the connecting plate.

[0014] Furthermore, a reinforcement component is provided on the lifting base. The reinforcement component includes a transmission cylinder, a second plug and an exchange pipe. The transmission cylinder is fixed on a section of the rod of the slide rod extending out of the clamping cylinder. The second plug is arranged at one end of the clamping cylinder away from the valve to be tested. The second plug is inserted into the transmission cylinder. The second plug abuts against the inner side wall of the transmission cylinder and can slide along the axial direction of the transmission cylinder. An exchange hole is formed at one end of the transmission cylinder facing the clamping cylinder. One end of the exchange pipe is connected to the exchange hole, and the other end is connected to the sealing groove.

[0015] Furthermore, a pressure maintaining component is provided on the clamping cylinder. The pressure maintaining component includes a connecting cylinder, an adjusting nut, a clamping rod and a clamping rack. The connecting cylinder is fixed on the clamping cylinder. The adjusting nut is threadedly connected in the connecting cylinder. A third compression spring is rotatably arranged at the bottom of the adjusting nut. One end of the third compression spring away from the adjusting nut is connected to the clamping rod. The clamping rod is slidably arranged in the connecting cylinder through a limiting component. A tooth is fixed at one end of the clamping rod away from the third compression spring. The clamping rack is fixed on one side surface of the first plug away from the first compression spring. The clamping rack is perpendicular to the axial direction of the clamping rod and corresponds to each other. The tooth on the clamping rod is inserted into the tooth groove of the clamping rack, and can limit the first plug to only move in the direction close to the valve to be tested.

[0016] Furthermore, an adjusting groove is formed at the bottom of the adjusting nut. A conversion plate is rotatably arranged at the bottom of the adjusting groove. The third compression spring is fixed on one side of the conversion plate away from the bottom of the adjusting groove.

[0017] Furthermore, the limiting component includes a limiting groove, a receiving plate and a limiting protrusion. The limiting groove is formed on the barrel wall of the connecting cylinder. The receiving plate is fixed on the top of the clamping rod. The receiving plate is adapted to the connecting cylinder. The limiting protrusion is fixed on the side end surface of the receiving plate. The limiting protrusion is inserted into the limiting groove. The third compression spring is fixed between the receiving plate and the conversion plate.

[0018] Furthermore, a receiving cylinder with a "convex" cross-section is provided at one end of the clamping cylinder facing the valve to be tested. A sealing member is arranged on the inner annular surface of the receiving cylinder. The end of the valve to be tested can be inserted into the receiving cylinder and abuts against the sealing member.

[0019] Furthermore, the sealing member is a rubber ring.

[0020] The beneficial effects of the present invention are:

[0021] When the airtightness detection device for a valve of the present invention performs an airtightness detection on a valve, the transmission mechanism can drive two clamping cylinders to clamp the valve to be detected. The clamped valve is placed in a water tank, the restriction on the first plug disc by the restriction component is cancelled, and the first plug disc approaches the valve under the elastic force of the first compression spring. Thus, the simulation of the valve in the water hammer effect can be realized. By observing whether there are bubbles on the valve, if no bubbles are generated, it indicates that the airtightness of the detected valve is qualified and can withstand the impact of the water hammer effect. If bubbles are generated, it means that the airtightness of the detected valve is unqualified and needs to be reprocessed. While detecting the airtightness of the valve, the present invention can also detect whether the valve can withstand the water hammer effect, making the airtightness of the valve detected by the present invention better and the quality better, reducing the valve damage caused by the water hammer effect and thus the waste of valves.

[0022] Further, the second compression spring and the telescopic shaft in the transmission mechanism have a certain buffering effect. When the clamping cylinder clamps the valve to be detected, the second compression spring and the telescopic shaft can buffer the clamping force exerted by the clamping cylinder on the valve to be detected, enabling the valve to be clamped in a more gentle manner, reducing the possibility of damage to the port of the valve to be detected, and playing a certain protective role for the valve to be detected.

[0023] Further, the teeth on the clamping rod in the pressure maintaining component cooperate with the clamping rack, enabling the first plug disc to only move towards the valve to be detected in the clamping cylinder. When the restriction on the first plug disc by the restriction component is cancelled, the pressure in the area between the first plug disc and the valve in the clamping cylinder will increase sharply. The setting of the clamping rack and the teeth on the clamping rod can keep the pressure in the area between the first plug disc and the valve unchanged for a long time, enabling a more sufficient detection of the valve and making the detection result more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic structural diagram of an airtightness detection device for a valve provided by an embodiment of the present invention;

[0026] Figure 2 It is a top view of a lifting base in an airtightness detection device for a valve provided by an embodiment of the present invention;

[0027] Figure 3 It is Figure 2 a schematic cross-sectional view in the A-A direction of

[0028] Figure 4 is Figure 3 The enlarged structural schematic diagram of part B in

[0029] Figure 5 is Figure 3 The enlarged structural schematic diagram of part C in

[0030] Figure 6 is Figure 3 The enlarged structural schematic diagram of part D in

[0031] In the figure: 100, lifting base; 110, motor; 111, gear; 200, water tank; 310, clamping cylinder; 311, receiving cylinder; 312, seal; 400, transmission unit; 410, first rack; 411, seal groove; 420, second rack; 421, seal block; 430, telescopic shaft; 431, connecting plate; 432, second compression spring; 510, first plug disk; 520, first compression spring; 610, connecting cylinder; 620, adjusting nut; 621, third compression spring; 622, adjusting groove; 623, conversion plate; 630, clamping rod; 631, teeth; 640, clamping rack; 700, limiting component; 710, sliding rod; 711, reinforcing hole; 720, electric cylinder; 800, limiting component; 810, limiting groove; 820, receiving plate; 830, limiting convex block; 900, reinforcing component; 901, first chamber; 902, second chamber; 910, transmission cylinder; 911, exchange hole; 920, second plug disk. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0033] The serial numbers assigned to components in this text, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The terms "connection" and "coupling" as used in this application, unless otherwise specifically stated, both include direct and indirect connection (coupling). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0034] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0035] As Figures 1 to 3 [[ID=!]]As shown, a gas tightness detection device for a valve provided by an embodiment of the present invention includes a water tank 200 and a lifting base 100 disposed in the water tank 200. The water tank 200 may be a box body without a top cover, and the box body is filled with water. The lifting base 100 may be a scissor type lifting base 100, or may be a simple lifting platform provided with a base on the top of a waterproof electric cylinder 720 or a hydraulic rod.

[0036] Two clamping cylinders 310 and a transmission mechanism are provided on the lifting base 100. The two clamping cylinders 310 are both slidably disposed on the lifting base 100, and the ports of the two clamping cylinders 310 correspond to each other. The two clamping cylinders 310 with opposite ports are used to clamp and seal the valve to be detected. The transmission mechanism may be located below the two clamping cylinders 310 on the lifting base 100, and the two clamping cylinders 310 approach or move away from each other on the lifting base 100 through the transmission mechanism, thereby realizing the fastening and loosening of the valve to be detected.

[0037] The clamping cylinder 310 is provided with a water hammer mechanism, and the water hammer mechanism includes a first plug 510, a first compression spring 520 and a limiting component 700. The first plug 510 is slidably arranged in the clamping cylinder 310, the first compression spring 520 is arranged between the first plug 510 and the bottom of the clamping cylinder 310, and the limiting component 700 is arranged on the clamping cylinder 310. The limiting component 700 is used to limit the movement of the first plug 510. When the clamping cylinder 310 clamps the valve to be detected, the clamped valve to be detected is placed in the water tank 200, the limitation of the limiting component 700 on the first plug 510 is cancelled, and the airtightness of the valve is detected by observing whether there are bubbles emerging from the valve.

[0038] Specifically, the clamping cylinder 310 can be a cylindrical cylinder body, its top end can be arranged similar to the bottle mouth of a water bottle, and a sealing ring can be fixed at the top end port, which is convenient for tightly pressing and sealing the port of the valve to be detected. A plurality of through holes can be opened at the bottom end of the clamping cylinder 310, and the plurality of through holes are uniformly distributed around a circle with the center of the bottom surface of the clamping cylinder 310 as the center of the circle. The first plug 510 is slidably arranged inside the clamping cylinder 310, the first plug 510 is coaxially arranged with the clamping cylinder 310, and a sealing ring can be fixed or sleeved on the side wall of the first plug 510. The sealing ring is made of rubber. When the first plug 510 slides in the clamping cylinder 310, its side wall and the sealing ring arranged on its side wall are in contact with the inner side wall of the clamping cylinder 310, so as to avoid the clamping cylinder 310 being unable to seal the valve to be detected due to the arrangement of the first plug 510.

[0039] The limiting component 700 is used to limit the movement of the first plug 510 in the clamping cylinder 310. When the clamped valve to be detected is placed in the water tank 200, if the limitation of the limiting component 700 on the first plug 510 is cancelled, the first plug 510 will quickly approach the valve to be detected under the action of the rebounding force of the first compression spring 520, and then the pressure inside the valve to be detected will increase sharply. The suddenly increased pressure will cause an impact on the valve to be detected. It can be judged whether the valve to be detected meets the airtightness requirements according to whether there are bubbles generated in the water tank 200 for the valve to be detected.

[0040] The operating principle of this embodiment is as follows:

[0041] First, place the valve to be detected between the two clamping cylinders 310, make the two end ports of the valve correspond to the top ports of the two clamping cylinders 310 on its two sides respectively, and then start the motor 110. The motor 110 drives the two clamping cylinders 310 to approach each other through the transmission mechanism until the two clamping cylinders 310 clamp and seal the valve to be detected. Due to the limitation of the limiting component 700 on the first plug 510, the first plug 510 cannot move in the clamping cylinder 310, that is, the space between the valve and the first plug 510 cannot change. At this time, the air pressure inside the valve should be equal to or slightly greater than the external atmospheric pressure;

[0042] Then, control the lifting base 100 to descend so that the valve is completely submerged below the liquid level of the water tank 200. After that, cancel the restriction of the first plug 510 by the restricting component 700. The first plug 510 will suddenly approach the valve under the elastic force of the first compression spring 520. At this time, the pressure inside the valve will suddenly increase, similar to a gas mass suddenly rushing into the valve, realizing the simulation of the valve in the water hammer effect. The gas suddenly rushing into the valve will impact the valve core, valve sleeve and other structures of the valve. During this period, observe whether there are bubbles generated on the valve. If no bubbles are generated, the detected airtightness of the valve is qualified and can withstand the impact of the water hammer effect. If bubbles are generated, it means that the detected airtightness of the valve is unqualified and needs to be reprocessed.

[0043] Through the detection of the present invention, the qualified valve not only has better airtightness, but also stronger impact resistance and better quality, reducing the waste of valves caused by the damage of valves due to the water hammer effect.

[0044] In some embodiments, the restricting component 700 includes a slide bar 710 and an electric cylinder 720. The slide bar 710 is fixed on the side of the first plug 510 facing the first compression spring 520. The electric cylinder 720 is installed on the base, and the electric cylinder 720 is located on the side of the clamping cylinder 310 away from the valve to be tested. One end of the slide bar 710 away from the first plug 510 penetrates through the end face of the cylinder body away from the valve to be tested and is connected to the output shaft of the electric cylinder 720.

[0045] Specifically, the electric cylinder 720 is a waterproof electric cylinder 720. The electric cylinder 720 is located at the end of the lifting base 100 close to the lifting base 100. A reinforcing hole 711 adapted to the output shaft of the electric cylinder 720 is provided on a part of the rod body of the slide bar 710 extending out of the clamping cylinder 310, and the reinforcing hole 711 is close to the end of the slide bar 710. The output shaft of the electric cylinder 720 is inserted into the reinforcing hole 711 to limit the first plug 510, so that the first plug 510 always compresses the first compression spring 520.

[0046] When the two clamping cylinders 310 clamp the valve to be tested and conduct an airtightness test on the valve to be tested, place the present invention into the water tank 200, start the electric cylinder 720, and the electric cylinder 720 drives its output shaft to retract into its cylinder body, so that the electric cylinder 720 releases the restriction on the slide bar 710. At this time, the first plug 510 approaches the valve to be tested under the action of the elastic force of the first compression spring 520, causing the pressure between the valve and the first plug 510 to suddenly increase. The suddenly increased pressure can impact the valve to be tested. During this period, observe whether there are water bubbles generated on the valve to be tested to realize the airtightness test of the valve.

[0047] In some other embodiments, the limiting component 700 may also include a drawstring and a fixing rod. The fixing rod is fixed on the lifting base 100 and is located on the side of the clamping cylinder 310 away from the valve to be tested. One end of the drawstring is tied to the fixing rod, and the other end extends into the clamping cylinder 310, passes through the first compression spring 520 and is fixedly connected to the first plug disc 510. When performing the airtightness test of the valve, when it is necessary to release the restriction of the limiting component 700 on the first plug disc 510, only the drawstring needs to be untied.

[0048] In some embodiments, the transmission mechanism includes two transmission units 400 and a motor 110. The motor 110 is installed on the lifting base 100. The two clamping cylinders 310 are symmetrically arranged with respect to the motor 110. The two transmission units 400 are centrosymmetrically arranged with respect to the center of the output shaft of the motor 110. The two transmission units 400 respectively correspond to the two clamping cylinders 310.

[0049] The transmission unit 400 includes a first rack 410, a second rack 420 and a telescopic shaft 430. A gear 111 is installed on the output shaft of the motor 110. The first rack 410 and the second rack 420 are both slidably arranged on the lifting base 100. The first rack 410 meshes with the gear 111. A sealing groove 411 is formed on the first rack 410. A sealing block 421 is fixed on the second rack 420. The sealing block 421 is inserted into the sealing groove 411 to achieve the sliding connection between the first rack 410 and the second rack 420. The telescopic shaft 430 is fixed at one end of the second rack 420 away from the first rack 410. A connecting plate 431 is connected to the end of the telescopic shaft 430 away from the second rack 420. A second compression spring 432 is sleeved on the telescopic shaft 430. The two ends of the second compression spring 432 are respectively connected to the connecting plate 431 and the second rack 420. The clamping cylinder 310 is arranged on the corresponding connecting plate 431 and can move along with the connecting plate 431.

[0050] Specifically, the transmission units 400 are each located below the corresponding clamping cylinder 310. The lengths of the first rack 410 and the second rack 420 are parallel, and both the first rack 410 and the second rack 420 are located on the same sliding surface of the lifting base 100, with the second rack 420 located to one side of the first rack 410. The sealing groove 411 is a rectangular, elongated groove body, which is provided on the end surface of the first rack 410 facing the second rack 420. The sealing block 421 is fixed to the end surface of the second rack 420 facing the first rack 410. The sealing block 421 is adapted to the sealing groove 411 and can be inserted into and slide within the sealing groove 411. The connecting plate 431 is fixed to the end of the telescopic shaft 430 away from the second rack 420. The connecting plate 431 can be fixedly connected to the corresponding clamping cylinder 310. Since the two transmission units 400 are centrally symmetrical about the center of the output shaft of the motor 110, the various structures within the two transmission units 400 are all centrally symmetrically arranged. Therefore, the fixed connection method between the connecting plate 431 and the corresponding clamping cylinder 310 can be a fixed connection achieved through any plate or rod, or a direct fixation method. The specific situation needs to be determined according to actual conditions.

[0051] When the sealing block 421 slides in the sealing groove 411, the sidewalls of the sealing block 421 abut against the inner sidewalls of the sealing groove 411. The sealing block 421 and the sealing groove 411 can form a closed chamber. When the motor 110 drives the gear 111 to rotate, the first racks 410 in the two transmission units 400 can slide toward or away from each other.

[0052] When the valve to be tested is placed between the two clamping cylinders 310, the drive motor 110 causes the first racks 410 in the two transmission units 400 to move toward each other. The pressure in the corresponding sealed chambers of the two transmission units 400 decreases, resulting in a negative pressure state. At this time, the second rack 420 can move closer to the corresponding first rack 410 to balance the pressure in the sealed chamber. As the second rack 420 moves, it drives the connecting plate 431 to move via the second compression spring 432 and the telescopic shaft 430, thereby driving the corresponding clamping cylinder 310 toward the valve to be tested, thereby tightening the valve to be tested between the two clamping cylinders 310. Conversely, when the first racks 410 in the two transmission units 400 move away from each other, the corresponding second rack 420 drives the connecting plate 431 away from each other via the second compression spring 432 and the telescopic shaft 430, thereby driving the clamping cylinders 310 away from each other, thereby loosening or disengaging the valve to be tested between the two clamping cylinders 310.

[0053] In this embodiment, the second compression spring 432 and the telescopic shaft 430 have a buffering effect. The second compression spring 432 and the telescopic shaft 430 can reduce the impact force received by the valve under test when the clamping cylinder 310 clamps the valve under test, enabling the valve under test to be clamped in a more gentle manner, reducing the possibility of damage to the ports of the valve under test, and playing a certain protective role for the valve under test.

[0054] In some embodiments, as Figures 1 to 4 shown, a pressure maintaining component is provided on the clamping cylinder 310. The pressure maintaining component includes a connecting cylinder 610, an adjusting nut 620, a clamping rod 630, and a clamping rack 640. The connecting cylinder 610 is fixed on the clamping cylinder 310. The adjusting nut 620 is threadedly connected inside the connecting cylinder 610. A third compression spring 621 is rotatably provided at the bottom of the adjusting nut 620. One end of the third compression spring 621 away from the adjusting nut 620 is connected to the clamping rod 630. The clamping rod 630 is slidably arranged inside the connecting cylinder 610 through a limiting component 800. A tooth 631 is fixed at one end of the clamping rod 630 away from the third compression spring 621. The clamping rack 640 is fixed on one side surface of the first plug 510 away from the first compression spring 520. The clamping rack 640 is perpendicular to the axial direction of the clamping rod 630 and corresponds to each other. The tooth 631 on the clamping rod 630 is inserted into the tooth groove of the clamping rack 640, which can limit the first plug 510 to only move in the direction close to the valve under test.

[0055] Specifically, the connecting cylinder 610 is perpendicular to the axial direction of the clamping cylinder 310. The connecting cylinder 610 is inserted and fixed on the side wall of the clamping cylinder 310. One end of it extends into the interior of the clamping cylinder 310, and the other end is located outside the clamping cylinder 310. A through hole is provided at one end of the connecting cylinder 610 extending into the clamping cylinder 310. The clamping rod 630 is a columnar rod member. The clamping rod 630 is inserted into the through hole and is slidably connected to the connecting cylinder 610 through a limiting component 800. The tooth 631 can be a triangular prism with two right-angled triangle bases. The side surface corresponding to the right-angled side on the base of the triangular prism is fixed on the clamping rod 630. The other side surface corresponding to the other right-angled side of its base is parallel to the axial direction of the clamping rod 630 and faces the port of the clamping cylinder 310. The side surface corresponding to the hypotenuse of its base faces away from the port of the clamping cylinder 310. The clamping rack 640 corresponds to the clamping rod 630. When the tooth 631 on the clamping rod 630 is inserted into the tooth groove of the clamping rack 640, the tooth 631 can limit the clamping rack 640 to only move in the direction close to the valve under test.

[0056] The adjusting nut 620 is a columnar structural member with external threads. The adjusting nut 620 always maintains a seal with the connecting cylinder 610 when rotating in the connecting cylinder 610. One end of the adjusting nut 620 away from the clamping cylinder 310 extends out of the connecting cylinder 610. The third compression spring 621 is rotatably connected to one end of the adjusting nut 620 inserted into the connecting cylinder 610.

[0057] In this embodiment, an adjustment groove 622 is provided at the bottom of the adjusting nut 620, and a conversion plate 623 is rotatably provided at the bottom of the adjusting groove 622. The conversion plate 623 can be rotatably connected to the bottom of the adjusting groove 622 through a rotating shaft and a bearing, and the third compression spring 621 is fixed on the side of the conversion plate 623 away from the bottom of the adjusting groove 622.

[0058] The limiting assembly 800 includes a limiting groove 810, a receiving plate 820, and a limiting protrusion 830. The limiting groove 810 is provided on the wall of the connecting tube 610, and the length direction of the limiting groove 810 is parallel to the axial direction of the connecting tube 610. The receiving plate 820 is fixed to the top of the clamping rod 630. The receiving plate 820 is adapted to the connecting tube 610, inserted into the connecting tube 610, and can slide along the axial direction of the connecting tube 610. The limiting protrusion 830 is fixed to the side end surface of the receiving plate 820. The limiting protrusion 830 is adapted to the limiting groove 810 provided on the inner side wall of the connecting tube 610. The limiting protrusion 830 is inserted into the limiting groove 810 and can slide along its length direction, thereby enabling the clamping rod 630 to slide within the connecting tube 610. One end of the third compression spring 621 away from the conversion plate 623 is fixed to one end of the receiving plate 820 away from the clamping rod 630 .

[0059] The setting of the limiting protrusion 830 and the limiting groove 810 ensures that when the receiving plate 820 slides in the connecting tube 610, it can only slide along the length direction of the limiting groove 810, thereby limiting the movement of the clamping rod 630 and the teeth 631, preventing the clamping rod 630 and the teeth 631 from rotating, and avoiding the mismatch between the teeth 631 and the teeth on the clamping rack 640.

[0060] Before performing valve inspection in this embodiment, the adjusting nut 620 is rotated to move the third compression spring 621 toward the direction close to the engaging rack 640. When the third compression spring 621 moves, it can drive the receiving plate 820 to move. When the receiving plate 820 moves, the limiting protrusion 830 can slide along the limiting groove 810, ensuring that the receiving plate 820 and the third compression spring 621 do not rotate with the rotation of the adjusting nut 620. When the receiving plate 820 moves, it can drive the engaging rod 630 to penetrate into the inner cavity of the clamping cylinder 310 and enable the teeth 631 of the engaging rod 630 to insert into the corresponding tooth grooves on the engaging rack 640. Under the elastic force of the third compression spring 621, the teeth 631 on the engaging rod 630 can interfere with the corresponding tooth grooves on the engaging rack 640. At this time, under the action of the limiting assembly 700, the engaging rack 640 will not move relative to the teeth 631 (engaging rod 630);

[0061] When the limiting component 700 cancels the limitation on the first plug 510, the first plug 510 suddenly moves closer to the valve to be tested under the elastic force of the first compression spring 520. The pressure in the space between the valve to be tested and the first plug 510 will suddenly increase. At this time, the airtightness of the valve to be tested can be detected under the water hammer effect. During the movement of the first plug 510, the clamping rack 640 will move synchronously. Since the side of the tooth 631 facing the valve to be tested is a straight surface and the side facing away from the valve to be tested is an inclined surface, when the clamping rack 640 moves relative to the tooth 631, the inner wall of the tooth groove on the clamping rack 640 will exert a certain pressure on the inclined surface of the tooth 631, thereby being able to push the tooth 631 to move in the direction close to the connecting cylinder 610, and then realizing the separation of the tooth 631 from the corresponding tooth groove.

[0062] After the tooth 631 disengages from the corresponding tooth groove, a new tooth groove on the clamping rack 640 will move below the tooth 631, and the tooth 631 is inserted into this tooth groove under the elastic force of the third compression spring 621. Then the tooth 631 repeats the process of disengaging from and inserting into the tooth groove on the clamping rack 640 until the first plug 510 no longer moves closer to the valve to be tested.

[0063] When the first plug 510 no longer moves closer to the valve, the pressure in the area between the first plug 510 and the valve reaches the maximum. At this time, the first plug 510 will be affected by the pressure in the area between the first plug 510 and the valve and move away from the valve to be tested. However, since the side of the tooth 631 facing the valve to be tested is a straight surface parallel to the axial direction of the clamping rod 630, when the clamping rack 640 moves with the first plug 510, the tooth 631 will only abut against the side wall of the tooth groove adapted to it and will not move relative to the clamping rack 640. That is, the volume of the area between the valve and the first plug 510 will not change at this time, and the corresponding air pressure will not change either. Only when the pressure in the area between the valve and the first plug 510 remains unchanged for a long time can a more accurate airtightness judgment be made on the valve to be tested.

[0064] When the airtightness detection of the valve to be tested is completed, the tested valve is lifted out of the water tank 200 by the lifting base 100. Then, the adjusting nut 620 is turned to make the adjusting nut 620 drive the third compression spring 621, the clamping rod 630 and the tooth 631 away from the clamping rack 640. When the clamping rack 640 is disengaged from the limitation of the tooth 631, the first plug 510 moves away from the valve, thereby compressing the first compression spring 520. Then, the sliding rod 710 is pulled to the side away from the valve and is pulled to the electric cylinder 720, so that the output shaft of the electric cylinder 720 is inserted back into the reinforcement hole 711 on the sliding rod 710. Then, the motor 110 is started to make the motor 110 drive the two first racks 410 to move away from each other. The movement of the first rack 410 can drive the second rack 420 to compress the second compression spring 432, realizing the shortening of the telescopic shaft 430. When the second compression spring 432 is compressed to a certain extent, the second compression spring 432 can push the connecting plate 431 to move away from the second rack 420, thereby making the clamping cylinders 310 connected to the connecting plate 431 move away from each other, canceling the clamping of the valve. Then, the tested valve is taken out from between the two clamping cylinders 310 to complete the removal of the valve in the present invention. Finally, the new valve to be tested is re-placed between the two clamping cylinders 310, and the airtightness detection of the valve is carried out again.

[0065] In some embodiments, as Figures 3 to 5 shown, a reinforcement component 900 is provided on the lifting base 100. The reinforcement component 900 includes a transmission cylinder 910, a second plug 920 and an exchange pipe. The transmission cylinder 910 is fixed on a section of the rod of the sliding rod 710 extending out of the clamping cylinder 310. The second plug 920 is arranged at one end of the clamping cylinder 310 away from the valve to be tested. The second plug 920 is inserted into the transmission cylinder 910. The second plug 920 abuts against the inner side wall of the transmission cylinder 910 and can slide along the axial direction of the transmission cylinder 910. An exchange hole 911 is opened at one end of the transmission cylinder 910 facing the clamping cylinder 310. One end of the exchange pipe is connected to the exchange hole 911, and the other end is connected to the sealing groove 411.

[0066] The transmission cylinder 910 is a hollow cylinder structure, and the transmission cylinder 910, the sliding rod 710, and the second plug 920 are all coaxially arranged. The side surface of the second plug 920 abuts against the inner side wall of the transmission cylinder 910, and the sliding rod 710 penetrates through both ends of the transmission cylinder 910. One end of the transmission cylinder 910 facing the clamping cylinder 310 is the inlet end, and the end far from the clamping cylinder 310 is the outlet end. The sliding rod 710 extends into the transmission cylinder 910 from the inlet end and extends out from the outlet end, and the port of the outlet end of the transmission cylinder 910 is fixedly connected to the sliding rod 710. One end of the clamping cylinder 310 far from the valve to be tested is inserted into the transmission cylinder 910, and the side wall of a part of the cylinder body of the clamping cylinder 310 inserted into the port of the transmission cylinder 910 abuts against the side wall of the inlet end of the transmission cylinder 910. The second plug 920 can divide the internal space of the transmission cylinder 910 into two sealed cavities, which are set as the first chamber 901 and the second chamber 902. The first chamber 901 is located between the second plug 920 and the clamping cylinder 310. An exchange hole 911 is provided on the side wall of the first chamber 901, and both ends of the exchange pipe are respectively connected to the exchange hole 911 and the sealing groove 411. The exchange pipe can be a pipeline with strong structural strength and strong tear resistance, such as a metal bellows or a steel wire nylon pipe.

[0067] In this embodiment, when the restriction of the electric cylinder 720 on the sliding rod 710 is cancelled, the first plug 510 quickly moves towards the valve to be tested under the action of the first compression spring 520. The pressure in the area between the first plug 510 and the valve to be tested will gradually increase until it stabilizes. During this period, the sliding rod 710 will move synchronously with the first plug 510, thereby causing the transmission cylinder 910 to slide synchronously. When the transmission cylinder 910 approaches the valve to be tested, the space of the first chamber 901 will increase, and the space of the second chamber 902 will decrease. When the space in the first chamber 901 becomes larger, the pressure will become smaller. At this time, the first chamber 901 with reduced pressure will extract the air in the sealing groove 411 through the exchange pipe to make the pressure in the first chamber tend to be stable. When the air in the sealing groove 411 decreases, the pressure will decrease, and the sealing block 421 will sink deeper into the bottom of the sealing groove 411, and then the clamping cylinder 310 can be driven closer to the valve to be tested through the telescopic shaft 430, so that the clamping cylinder 310 can better fasten and seal the valve. This makes it unnecessary to worry about air leakage at the valve port during the airtightness detection of the valve, especially during the detection of water hammer impact.

[0068] In some embodiments, as Figures 3 to 6 shown, the end of the clamping cylinder 310 facing the valve to be tested is provided with a receiving cylinder 311 with a "convex" cross-section. A sealing member 312 is arranged on the inner annular surface of the receiving cylinder 311, and the end of the valve to be tested can be inserted into the receiving cylinder 311 and abut against the sealing member 312.

[0069] The "convex"-shaped receiving cylinder 311 includes a large-head end and a small-head end. Among them, the small-head end is fixedly connected to the side of the clamping cylinder 310 facing the valve, and the large-head end is a cylindrical structure with a broken-line-shaped cross-section. The large-head end is sleeved on one end of the valve to be measured, which is more convenient for positioning and clamping the valve.

[0070] The seal 312 can be a rubber ring. The rubber ring is attached to the inner circumferential surface of the large-head end, mainly serving to seal the gap between the receiving cylinder 311 and the valve port.

[0071] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An air tightness detection device for a valve, characterized in that: The invention comprises a water tank (200) and a lifting base (100) arranged in the water tank (200); a clamping cylinder (310) and a transmission mechanism are provided on the lifting base (100); two clamping cylinders (310) are provided, both of the clamping cylinders (310) are slidably arranged on the lifting base (100), and the ports of the two clamping cylinders (310) are arranged opposite to each other; the two clamping cylinders (310) clamp or release the valve to be tested under the action of the transmission mechanism; The clamping cylinder (310) is provided with a water hammer mechanism, which includes a first plug disc (510), a first compression spring (520) and a limiting assembly (700); the first plug disc (510) is slidably arranged in the clamping cylinder (310); the first compression spring (520) is connected between the first plug disc (510) and the bottom of the clamping cylinder (310); and the limiting assembly (700) is used to limit the movement of the first plug disc (510); The limiting assembly (700) includes a sliding rod (710) and an electric cylinder (720), wherein the sliding rod (710) is fixed on a side of the first plug disc (510) facing the first compression spring (520), and the electric cylinder (720) is installed on the lifting base (100). The electric cylinder (720) is located on a side of the clamping cylinder (310) away from the valve to be tested, and the sliding rod (710) passes through the clamping cylinder (310) and is connected to an output shaft of the electric cylinder (720); When the clamping cylinder (310) clamps the valve to be tested, the clamped valve to be tested is placed in the water tank (200), the restriction of the restriction component (700) on the first plug disc (510) is cancelled, and the air tightness of the valve is detected by observing whether bubbles emerge from the valve.

2. The air tightness detection device for a valve according to claim 1, characterized in that: A reinforcement hole (711) is provided on the rod body of the sliding rod (710) extending out of the clamping cylinder (310), and the output shaft of the electric cylinder (720) passes through the reinforcement hole (711).

3. The air tightness detection device for a valve according to claim 1, characterized in that: The transmission mechanism comprises two transmission units (400) and a motor (110), wherein the motor (110) is mounted on the lifting base (100), the two clamping cylinders (310) are symmetrically arranged with respect to the motor (110), the two transmission units (400) are centrally symmetrically arranged with respect to the center of the output shaft of the motor (110), and the two transmission units (400) correspond to the two clamping cylinders (310) respectively; The transmission unit (400) includes a first rack (410), a second rack (420) and a telescopic shaft (430); a gear (111) is installed on the output shaft of the motor (110); the first rack (410) and the second rack (420) are both slidably arranged on the lifting base (100); the first rack (410) is meshed with the gear (111); a sealing groove (411) is provided on the first rack (410); a sealing block (421) is fixed on the second rack (420); the sealing block (421) is inserted into the sealing groove (411) to realize the first rack (41 0) is connected to the second rack (420) in a sliding manner, the telescopic shaft (430) is fixed to the end of the second rack (420) away from the first rack (410), the end of the telescopic shaft (430) away from the second rack (420) is connected to a connecting plate (431), a second compression spring (432) is sleeved on the telescopic shaft (430), the two ends of the second compression spring (432) are respectively connected to the connecting plate (431) and the second rack (420), the clamping cylinder (310) is arranged on the corresponding connecting plate (431), and can move synchronously with the connecting plate (431).

4. The air tightness detection device for a valve according to claim 3, characterized in that: A reinforcement component (900) is provided on the lifting base, and the reinforcement component (900) includes a transmission cylinder (910), a second plug disc (920) and an exchange tube. The transmission cylinder (910) is fixed on a section of the rod body of the sliding rod (710) extending out of the clamping cylinder (310). The second plug disc (920) is arranged at an end of the clamping cylinder (310) away from the valve to be tested. The second plug disc (920) is inserted into the transmission cylinder (910). The second plug disc (920) contacts the inner side wall of the transmission cylinder (910) and can slide along the axial direction of the transmission cylinder (910). The transmission cylinder (910) is provided with an exchange hole (911) at one end facing the clamping cylinder (310). One end of the exchange tube is connected to the exchange hole (911), and the other end is connected to the sealing groove (411).

5. The air tightness detection device for a valve according to claim 1, characterized in that: The clamping cylinder (310) is provided with a pressure-maintaining assembly, which includes a connecting cylinder (610), an adjusting nut (620), a clamping rod (630) and a clamping rack (640). The connecting cylinder (610) is fixed on the clamping cylinder (310), and the adjusting nut (620) is threadedly connected in the connecting cylinder (610). A third compression spring (621) is provided at the bottom of the adjusting nut (620). One end of the third compression spring (621) away from the adjusting nut (620) is connected to the clamping rod (630). The clamping rod (630) is connected to the clamping rod (630) through the limiting assembly (8 00) is slidably arranged in the connecting tube (610), and a tooth (631) is fixed on one end of the clamping rod (630) away from the third compression spring (621), and the clamping rack (640) is fixed on the side surface of the first plug disc (510) away from the first compression spring (520), and the clamping rack (640) is perpendicular to the axial direction of the clamping rod (630) and corresponds to each other, and the tooth (631) on the clamping rod (630) is inserted into the tooth groove of the clamping rack (640), which can limit the first plug disc (510) to move only in the direction close to the valve to be tested.

6. The air tightness detection device for a valve according to claim 5, characterized in that: An adjusting slot (622) is provided at the bottom of the adjusting slot (622), a conversion plate (623) is rotatably provided at the bottom of the adjusting slot (622), and the third compression spring (621) is fixed on a side of the conversion plate (623) away from the bottom of the adjusting slot (622).

7. The air tightness detection device for a valve according to claim 6, characterized in that: The limiting assembly (800) includes a limiting groove (810), a receiving plate (820) and a limiting protrusion (830), wherein the limiting groove (810) is provided on the wall of the connecting tube (610), the receiving plate (820) is fixed to the top of the clamping rod (630), the receiving plate (820) is adapted to the connecting tube (610), the limiting protrusion (830) is fixed on the side end surface of the receiving plate (820), the limiting protrusion (830) is inserted into the limiting groove (810), and the third compression spring (621) is fixed between the receiving plate (820) and the conversion plate (623).

8. The air tightness detection device for a valve according to claim 1, characterized in that: The clamping cylinder (310) is provided with a receiving cylinder (311) with a convex cross-section at one end facing the valve to be tested. A sealing member (312) is provided on the annular surface inside the receiving cylinder (311). The end of the valve to be tested can be inserted into the receiving cylinder (311) and abut against the sealing member (312).

9. The air tightness detection device for a valve according to claim 8, characterized in that: The sealing member (312) is a rubber ring.

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