Air tightness detection device for valve

Abstract

The air tightness detection device comprises a water tank and a lifting base arranged in the water tank, clamping cylinders and a transmission mechanism are arranged on the lifting base, the number of the clamping cylinders is two, the ports of the two clamping cylinders are opposite and are arranged on the lifting base in a sliding mode, and the transmission mechanism is 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 arranged on the clamping and fixing cylinder and comprises a first plug disc arranged in the clamping and fixing cylinder in a sliding mode, a first compressed spring connected between the first plug disc and the bottom of the clamping and fixing cylinder and a limiting assembly, and the limiting assembly is used for limiting movement of the first plug disc; when the to-be-detected valve is clamped by the clamping cylinder, the to-be-detected valve is placed in the water tank, limitation of the limiting assembly on the first plug disc is canceled, and air tightness detection of the valve is achieved by observing whether bubbles emerge on the valve or not. According to the invention, more comprehensive air tightness detection can be carried out on the valve, so that valve waste caused by valve damage due to a water hammer effect is reduced.

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 on-off of the fluid can be achieved, and the flow rate, pressure, temperature, or other parameters 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] In the existing Chinese patent with the publication number CN117782445B and the name "An airtightness detection device for valves", the introduced valve airtightness detection device 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 gradually inflates the valve and cannot detect the airtightness of the valve under the water hammer effect. If a valve that has passed the detection of the existing airtightness detection device fails to maintain its airtightness due to too large an impact force inside the valve when the water hammer effect occurs during use, it will cause 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 valve, 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: 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; A water hammer mechanism is provided on the clamping cylinder. The water hammer mechanism includes a first plug disc, a first compression spring, and a limiting component. The first plug disc is slidably disposed within the clamping cylinder. The first compression spring is connected between the first plug disc and the bottom of the clamping cylinder. The limiting component is used to limit the movement of the first plug disc. 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 disc is cancelled, and the airtightness of the valve is detected by observing whether there are bubbles emerging from the valve.

[0007] Furthermore, the limiting component includes a sliding rod and an electric cylinder. The sliding rod is fixed on one side of the first plug disc 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 sliding rod penetrates through the clamping cylinder and is connected to the output shaft of the electric cylinder.

[0008] Furthermore, a reinforcement hole is provided on the rod body of the sliding rod extending out of the clamping cylinder. The output shaft of the electric cylinder passes through the reinforcement hole.

[0009] Furthermore, 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. 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. One end of the telescopic shaft away from the second rack is connected to a connecting plate. 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.

[0010] Furthermore, a reinforcement component is provided on the lifting base. The reinforcement component includes a transmission cylinder, a second plug disk, and an exchange pipe. The transmission cylinder is fixed on a section of the rod of the sliding rod extending out of the clamping cylinder. The second plug disk is arranged at one end of the clamping cylinder away from the valve under test. The second plug disk is inserted into the transmission cylinder. The second plug disk 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.

[0011] 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 disk 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 disk to only move in the direction close to the valve under test.

[0012] 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.

[0013] Furthermore, the limiting component includes a limiting groove, a bearing plate, and a limiting convex block. The limiting groove is formed on the barrel wall of the connecting cylinder. The bearing plate is fixed on the top of the clamping rod. The bearing plate is adapted to the connecting cylinder. The limiting convex block is fixed on the side end surface of the bearing plate. The limiting convex block is inserted into the limiting groove. The third compression spring is fixed between the bearing plate and the conversion plate.

[0014] Furthermore, a receiving cylinder with a "convex" cross-section is arranged at one end of the clamping cylinder facing the valve under test. A sealing member is arranged on the inner annular surface of the receiving cylinder. The end of the valve under test can be inserted into the receiving cylinder and abuts against the sealing member.

[0015] Furthermore, the sealing member is a rubber ring.

[0016] The beneficial effects of the present invention are: When the airtightness detection device for a valve of the present invention detects the airtightness of a valve, the transmission mechanism can drive two clamping cylinders to clamp the valve to be detected, place the clamped valve into a water tank, cancel the restriction of the restriction component on the first plug, and the first plug 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. Observe whether there are bubbles on the valve. If there are no bubbles, it indicates that the airtightness of the detected valve is qualified and can withstand the impact of the water hammer effect. If there are bubbles, 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 valve waste.

[0017] 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 applied by the clamping cylinder to 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.

[0018] Further, the teeth on the clamping rod in the pressure maintaining component cooperate with the clamping rack, enabling the first plug to move only in the direction close to the valve to be detected in the clamping cylinder. When the restriction on the first plug by the restriction component is cancelled, the pressure in the area between the first plug 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 and the valve unchanged for a long time, enabling more sufficient detection of the valve and making the detection result more accurate. Description of the Drawings

[0019] 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.

[0020] Figure 1 It is a schematic structural diagram of an airtightness detection device for a valve provided by an embodiment of the present invention; 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; Figure 3 It is Figure 2 A cross-sectional view taken along the A-A direction in Figure 4 It isFigure 3 Schematic enlarged structure diagram of part B in Figure 5 is Figure 3 Schematic enlarged structure diagram of part C in Figure 6 is Figure 3 Schematic enlarged structure diagram of part D in

[0021] 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, reinforcement hole; 720, electric cylinder; 800, limiting component; 810, limiting groove; 820, receiving plate; 830, limiting convex block; 900, reinforcement component; 901, first chamber; 902, second chamber; 910, transmission cylinder; 911, exchange hole; 920, second plug disk. Specific embodiments

[0022] 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 making creative efforts shall fall within the protection scope of the present invention.

[0023] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, 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 therefore cannot be construed as a limitation of the present invention.

[0024] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0025] As Figures 1 to 3 shown, a hermeticity 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 with a base disposed on the top of a waterproof electric cylinder 720 or a hydraulic rod.

[0026] 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, so as to realize the fastening and loosening of the valve to be detected.

[0027] A water hammer mechanism is provided on the clamping cylinder 310. The water hammer mechanism includes a first plug disk 510, a first compression spring 520 and a limiting component 700. The first plug disk 510 is slidably disposed in the clamping cylinder 310, the first compression spring 520 is disposed between the first plug disk 510 and the bottom of the clamping cylinder 310, and the limiting component 700 is disposed on the clamping cylinder 310. The limiting component 700 is used to limit the movement of the first plug disk 510. When the clamping cylinder 310 clamps the valve to be detected, the clamped valve to be detected is placed into the water tank 200, the limitation of the limiting component 700 on the first plug disk 510 is cancelled, and the hermeticity of the valve is detected by observing whether there are bubbles emerging from the valve.

[0028] Specifically, the clamping cylinder 310 can be a cylindrical cylinder, and its top end can be arranged similar to the mouth of a water bottle. 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 evenly distributed around the circumference with the center of the bottom surface of the clamping cylinder 310 as the center of the circle. The first plug disk 510 is slidably arranged inside the clamping cylinder 310. The first plug disk 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 disk 510. The sealing ring is made of rubber. When the first plug disk 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 prevent the clamping cylinder 310 from being unable to block the valve to be detected due to the arrangement of the first plug disk 510.

[0029] The limiting component 700 is used to limit the movement of the first plug disk 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 disk 510 is cancelled, the first plug disk 510 will quickly move towards the valve to be detected under the action of the rebounding force of the first compression spring 520. As a result, the pressure inside the valve to be detected will increase sharply, and the suddenly increased pressure will impact 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.

[0030] The operating principle of this embodiment is as follows: First, place the valve to be detected between the two clamping cylinders 310, so that the two end ports of the valve correspond to the top ports of the two clamping cylinders 310 on its two sides respectively. Then start the motor 110, and 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 disk 510, the first plug disk 510 cannot move in the clamping cylinder 310, that is, the space between the valve and the first plug disk 510 cannot change. At this time, the air pressure inside the valve should be equal to or slightly greater than the external atmospheric pressure. Then, control the lifting base 100 to descend so that the valve is completely submerged below the liquid level of the water tank 200. Then cancel the limitation of the limiting component 700 on the first plug disk 510. The first plug disk 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 airtightness of the detected valve is qualified and can withstand the impact of the water hammer effect. If there are bubbles generated, it means that the airtightness of the detected valve is unqualified and needs to be reprocessed.

[0031] After passing the inspection of the present invention, the valve not only has better airtightness, but also stronger impact resistance and better quality, reducing the valve damage caused by the water hammer effect and thus the valve waste.

[0032] In some embodiments, the limiting component 700 includes a sliding rod 710 and an electric cylinder 720. The sliding rod 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 sliding rod 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.

[0033] 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 sliding rod 710 extending out of the clamping cylinder 310, and the reinforcing hole 711 is close to the end of the sliding rod 710. When the output shaft of the electric cylinder 720 is inserted into the reinforcing hole 711, the limit of the first plug 510 can be realized, so that the first plug 510 always keeps compressing the first compression spring 520.

[0034] When the two clamping cylinders 310 clamp the valve to be tested and perform airtightness detection on the valve to be tested, place the present invention in 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 sliding rod 710. At this time, the first plug 510 is close to the valve to be tested under the action of the elastic force of the first compression spring 520, so that the pressure between the valve and the first plug 510 suddenly increases. The suddenly increased pressure can impact the valve to be tested. During this period, observe whether there are water bubbles on the valve to be tested to realize the airtightness detection of the valve.

[0035] In some other embodiments, the limiting component 700 may also include a pull rope 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 pull rope 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 510. When performing airtightness detection of the valve, when it is necessary to release the restriction of the limiting component 700 on the first plug 510, only need to untie the pull rope.

[0036] 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.

[0037] The transmission unit 400 includes a first rack 410, a second rack 420, and a telescopic shaft 430. A gear 111 is mounted on the output shaft of the motor 110. Both the first rack 410 and the second rack 420 are slidably disposed on the lifting base 100. The first rack 410 meshes with the gear 111. A sealing groove 411 is formed in 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 to 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. 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 disposed on the corresponding connecting plate 431 and can move along with the connecting plate 431.

[0038] Specifically, the transmission units 400 are all located below the corresponding clamping cylinders 310. The length directions 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. The second rack 420 is located on one side of the first rack 410. The sealing groove 411 is a rectangular strip-shaped groove body, which is formed on the end surface of the first rack 410 facing the second rack 420. The sealing block 421 is fixed on 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 the sealing block 421 can be inserted into the sealing groove 411 and slide therein. The connecting plate 431 is fixed to the end of the telescopic shaft 430 away from the second rack 420, and the connecting plate 431 can be fixedly connected to the corresponding clamping cylinder 310. Since the two transmission units 400 are centrosymmetric about the center of the output shaft of the motor 110, the various structures in the two transmission units 400 are all centrosymmetrically arranged. Therefore, the fixed connection manner between the connecting plate 431 and the corresponding clamping cylinder 310 can be achieved by fixing through any plate or rod member, or by direct fixing. The specific situation needs to be determined according to the actual situation.

[0039] When the sealing block 421 slides in the sealing groove 411, the side wall of the sealing block 421 abuts against the inner side wall of the sealing groove 411. The sealing block 421 and the sealing groove 411 can form a sealed chamber. When the motor 110 drives the gear 111 to rotate, the first racks 410 in the two transmission units 400 can slide towards or away from each other.

[0040] When the valve to be tested is placed between the two clamping cylinders 310, the driving motor 110 causes the first racks 410 in the two transmission units 400 to move towards each other. The pressure in the corresponding sealed chambers of the two transmission units 400 will decrease, presenting 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. When the second rack 420 moves, it will drive the connecting plate 431 to move through the second compression spring 432 and the telescopic shaft 430, and then drive the corresponding clamping cylinder 310 to move closer to the valve to be tested, thereby realizing the fastening of 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 racks 420 drive the connecting plates 431 to move away from each other through the second compression spring 432 and the telescopic shaft 430, and then drive the clamping cylinders 310 to move away from each other, realizing the loosening or detachment of the valve to be tested between the two clamping cylinders 310.

[0041] 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 on the valve to be tested when the clamping cylinder 310 clamps the valve to be tested, enable the valve to be tested to be clamped in a more gentle manner, make the possibility of the port of the valve to be tested being damaged smaller, and can play a certain protective role for the valve to be tested.

[0042] In some embodiments, as Figures 1 to 4 shown, a pressure-holding component is provided on the clamping cylinder 310. The pressure-holding 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 in 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 in 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 disk 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 disk 510 to only move towards the direction close to the valve to be tested.

[0043] Specifically, the connecting cylinder 610 is axially perpendicular to the clamping cylinder 310. The connecting cylinder 610 is inserted and fixed on the side wall of the clamping cylinder 310, with one end extending into the interior of the clamping cylinder 310 and the other end 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, and the clamping rod 630 is inserted into the through hole and slidably connected to the connecting cylinder 610 through the limiting component 800. The tooth 631 can be a triangular prism with both bottom surfaces being right-angled triangles. The side surface corresponding to the right-angled side on the bottom surface of the triangular prism is fixed on the clamping rod 630. The side surface corresponding to the other right-angled side of its bottom surface is parallel to the axis of the clamping rod 630 and faces the port of the clamping cylinder 310, and the side surface corresponding to the hypotenuse of its bottom surface 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 move only in the direction close to the valve to be measured.

[0044] 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 the connecting cylinder 610 rotates. 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.

[0045] In this embodiment, an adjusting groove 622 is provided at the bottom of the adjusting nut 620. 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. The third compression spring 621 is fixed on the side of the conversion plate 623 away from the bottom of the adjusting groove 622.

[0046] The limiting component 800 includes a limiting groove 810, a bearing plate 820, and a limiting protrusion 830. The limiting groove 810 is provided on the barrel wall of the connecting cylinder 610, and the length direction of the limiting groove 810 is parallel to the axis of the connecting cylinder 610. The bearing plate 820 is fixed on the top of the clamping rod 630. The bearing plate 820 is adapted to the connecting cylinder 610. The bearing plate 820 is inserted into the connecting cylinder 610 and can slide along the axis of the connecting cylinder 610. The limiting protrusion 830 is fixed on the side end surface of the bearing plate 820. The limiting protrusion 830 is adapted to the limiting groove 810 provided on the inner side wall of the connecting cylinder 610. The limiting protrusion 830 is inserted into the limiting groove 810 and can slide along its length direction, thereby realizing the sliding of the clamping rod 630 in the connecting cylinder 610. One end of the third compression spring 621 away from the conversion plate 623 is fixed on one end of the bearing plate 820 away from the clamping rod 630.

[0047] The provision of the limiting bump 830 and the limiting groove 810 enables the receiving plate 820 to slide only along the length direction of the limiting groove 810 when sliding within the connecting cylinder 610, thereby restricting 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 situation where the teeth 631 do not match the tooth grooves on the clamping rack 640.

[0048] Before the valve is detected in this embodiment, the adjusting nut 620 is rotated to move the third compression spring 621 towards the clamping 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 bump 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 clamping rod 630 to penetrate into the inner cavity of the clamping cylinder 310 and enable the teeth 631 of the clamping rod 630 to be inserted into the corresponding tooth grooves on the clamping rack 640. Under the elastic force of the third compression spring 621, the teeth 631 on the clamping rod 630 can abut against the corresponding tooth grooves on the clamping rack 640. At this time, under the action of the limiting assembly 700, the clamping rack 640 will not move relative to the teeth 631 (clamping rod 630); When the limiting assembly 700 cancels the restriction on the first plug 510, the first plug 510 suddenly moves towards 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 increase suddenly, and 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 teeth 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 teeth 631, the inner wall of the tooth groove on the clamping rack 640 will exert a certain pressure on the inclined surface of the teeth 631, thereby being able to push the teeth 631 towards the connecting cylinder 610, and then realizing the detachment of the teeth 631 from the corresponding tooth grooves.

[0049] After the teeth 631 are detached from the corresponding tooth grooves, the new tooth grooves on the clamping rack 640 will move below the teeth 631, and the teeth 631 are inserted into the tooth grooves under the elastic force of the third compression spring 621. Then the teeth 631 repeat the detachment and insertion in the tooth grooves on the clamping rack 640 until the first plug 510 no longer moves towards the valve to be tested.

[0050] When the first plug 510 is no longer close to the valve, the pressure in the area between the first plug 510 and the valve reaches its 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 axis 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 that matches 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.

[0051] When the airtightness test 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 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 released 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 slide bar 710 is pulled towards the side away from the valve and 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 slide bar 710. Then, the motor 110 is started to 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 causing the clamping cylinders 310 connected to the connecting plate 431 to 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, a new valve to be tested is re-placed between the two clamping cylinders 310, and the airtightness test of the valve is carried out again.

[0052] In some embodiments, such as Figures 3 to 5As shown in the figure, a reinforcement assembly 900 is provided on the lifting base 100. The reinforcement assembly 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 slide 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 measured. 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 axially along 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.

[0053] The transmission cylinder 910 is a hollow cylinder structure. The transmission cylinder 910, the slide 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. The slide 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 away from the clamping cylinder 310 is the outlet end. The slide rod 710 extends into the transmission cylinder 910 from the inlet end and extends out from the outlet end. The port of the outlet end of the transmission cylinder 910 is fixedly connected to the slide rod 710. One end of the clamping cylinder 310 away from the valve to be measured 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 opened on the side wall of the first chamber 901. 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.

[0054] In this embodiment, after canceling the restriction of the electric cylinder 720 on the sliding rod 710, 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. As 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 penetrate 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 possible to perform the airtightness test of the valve, especially when performing the water hammer impact test, without worrying about air leakage at the valve port.

[0055] In some embodiments, as Figures 3 to 6 shown, one end of the clamping cylinder 310 facing the valve to be tested is provided with a receiving cylinder 311 having a "convex" cross-section. A sealing member 312 is provided on the inner annular surface of the receiving cylinder 311. The end of the valve to be tested can be inserted into the receiving cylinder 311 and abuts against the sealing member 312.

[0056] 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 one side of the clamping cylinder 310 facing the valve. The large head end is a cylindrical structure with a broken-line cross-section shape. The large head end is sleeved on one end of the valve to be tested, which is more convenient for positioning and clamping the valve.

[0057] The sealing member 312 can be a rubber ring. The rubber ring is attached to the inner annular surface of the large head end, mainly serving to seal the gap between the receiving cylinder 311 and the valve port.

[0058] 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 in the protection scope of the present invention.

Claims

1. An airtightness detection device for a valve, characterized in that It includes 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). There are two clamping cylinders (310). Both of the two clamping cylinders (310) are slidably arranged on the lifting base (100), and the ports of the two clamping cylinders (310) are arranged oppositely. The two clamping cylinders (310) clamp or loosen the valve to be tested under the action of the transmission mechanism; A water hammer mechanism is arranged on the clamping cylinder (310). The water hammer mechanism includes a first plug disk (510), a first compression spring (520) and a limiting component (700). The first plug disk (510) is slidably arranged in the clamping cylinder (310). The first compression spring (520) is connected between the first plug disk (510) and the bottom of the clamping cylinder (310). The limiting component (700) is used to limit the movement of the first plug disk (510); When the clamping cylinder (310) clamps the valve to be tested, the clamped valve to be tested is placed into the water tank (200). The limitation of the limiting component (700) on the first plug disk (510) is cancelled, and the air tightness of the valve is detected by observing whether there are bubbles emerging from the valve.

2. The air tightness detection device for a valve according to claim 1, wherein: The limiting component (700) includes a sliding rod (710) and an electric cylinder (720). The sliding rod (710) is fixed on one side of the first plug disk (510) facing the first compression spring (520). The electric cylinder (720) is installed on the lifting base (100). The electric cylinder (720) is located on the side of the clamping cylinder (310) away from the valve to be tested. The sliding rod (710) penetrates through the clamping cylinder (310) and is connected to the output shaft of the electric cylinder (720).

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

4. The air tightness detection device for a valve according to claim 2, wherein: 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) 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 mounted 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 in 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 to one end of the second rack (420) away from the first rack (410). One 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). 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).

5. The airtightness detection device for a valve according to claim 4, wherein: A reinforcement assembly (900) is provided on the lifting base. The reinforcement assembly (900) includes a transmission cylinder (910), a second plug disc (920) and an exchange pipe. The transmission cylinder (910) is fixed on a section of the rod body of the slide rod (710) extending out of the clamping cylinder (310). The second plug disc (920) is arranged at one 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) abuts against the inner side wall of the transmission cylinder (910) and can slide axially along the transmission cylinder (910). An exchange hole (911) is formed 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).

6. The airtightness detection device for a valve according to claim 2, wherein: A pressure-holding component is provided on the clamping cylinder (310). The pressure-holding 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 disk (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 disk (510) to only move in the direction close to the valve to be tested.

7. The airtightness detection device for a valve according to claim 6, wherein: An adjusting groove (622) is opened at the bottom of the adjusting nut (620). A conversion plate (623) is rotatably arranged at the bottom of the adjusting groove (622). The third compression spring (621) is fixed on one side of the conversion plate (623) away from the bottom of the adjusting groove (622).

8. The airtightness detection device for a valve according to claim 7, wherein: The limiting component (800) includes a limiting groove (810), a receiving plate (820), and a limiting protrusion (830). The limiting groove (810) is opened on the cylinder wall of the connecting cylinder (610). The receiving plate (820) is fixed on the top of the clamping rod (630). The receiving plate (820) is adapted to the connecting cylinder (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). The third compression spring (621) is fixed between the receiving plate (820) and the conversion plate (623).

9. The airtightness detection device for a valve according to claim 1, wherein: One 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 circumferential surface of the receiving cylinder (311). The end of the valve to be tested can be inserted into the receiving cylinder (311) and abutted against the sealing member (312).

10. The airtightness detection device for a valve according to claim 9, wherein: The sealing member (312) is a rubber ring.

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