Universal pressure testing device for valves of multiple specifications

Abstract

The invention provides a universal pressure testing device for valves of multiple specifications, and belongs to the technical field of valve detection, the universal pressure testing device comprises a main body rack and a clamping mechanism, the clamping mechanism is arranged in a pressure testing water tank and used for fixing and clamping valves, the clamping mechanism comprises a clamping support, a fixed sealing plate is fixedly arranged in the clamping support, and a movable sealing plate is movably arranged in the clamping support; the fixed sealing plate and the movable sealing plate are used for clamping and sealing flange inlets and outlets in the two sides of a valve correspondingly, and the movable sealing plate arranged in a sliding mode can be matched with valves of different specifications. The sealing inflation mechanism is fixedly installed on the fixed sealing plate and the movable sealing plate and is inserted into the flange inlet and outlet to support and seal the flange inlet and outlet, the supporting size of the sealing inflation mechanism is adjustable, and the sealing inflation mechanism is suitable for sealing and supporting valves of different specifications and sizes; through the sliding arrangement of the movable sealing plate and the characteristic that the supporting size of the sealing inflation mechanism is adjustable, the device can adapt to valves of different specifications, and the universality of the device is improved.

Description

Technical Field

[0001] This invention belongs to the field of valve testing technology, specifically a universal pressure testing device for valves of various specifications. Background Technology

[0002] As a core component of fluid control systems, the reliability of valve sealing performance directly determines the safe operation and efficiency of the entire system. In industrial production environments, valves must withstand the pressure, temperature, and corrosive effects of different media for extended periods. Therefore, testing valve sealing performance is a crucial step in ensuring system stability. Currently, a commonly used testing method involves immersing the sealed valve in a water tank, filling the valve with gas, and observing the formation of bubbles to assess the sealing effect.

[0003] However, this method has significant drawbacks in practical applications. Traditional flange connections rely on manual installation and removal of bolts one by one for fixing, a process that is extremely cumbersome, time-consuming, and prone to errors leading to low testing efficiency. Furthermore, the weight of the valve itself can cause uneven stress on the clamping mechanism during testing, leading to sealing surface misalignment or loosening, thus affecting the accuracy and repeatability of the test results. In addition, existing testing equipment is typically only compatible with a single valve specification, lacking compatibility with valves of different sizes and types. This necessitates companies configuring multiple sets of dedicated equipment, increasing production costs and space requirements. More importantly, valves are often installed at non-standard angles in actual operating conditions, while existing equipment only supports fixed-angle testing (vertical or horizontal), failing to simulate multi-angle conditions under real-world usage. This means that valves that pass laboratory testing may still experience sealing failures in practical applications, seriously threatening the safe operation of the system. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0005] The technical solution adopted by this invention to solve its technical problem is: a universal pressure testing device for multi-specification valves, comprising:

[0006] The main frame serves as the mounting body for the pressure testing device, and a pressure testing water tank is fixedly installed on it. The upper end of the main frame is used for a storage tank for adding pressure testing water to the pressure testing water tank and a pressure testing air tank for providing an air source for valve pressure testing.

[0007] A clamping mechanism is installed inside the test pressure tank to fix and clamp the valve. The clamping mechanism includes a clamping bracket, in which a fixed sealing plate is fixedly installed and a movable sealing plate is movably installed. The fixed sealing plate and the movable sealing plate are used to clamp and seal the flange inlet and outlet on both sides of the valve, and the slidably installed movable sealing plate can adapt to valves of different specifications.

[0008] The sealing and inflation mechanism is fixedly installed on the fixed sealing plate and the movable sealing plate. It is inserted into the flange inlet and outlet to support and seal the flange inlet and outlet. The support size of the sealing and inflation mechanism is adjustable to adapt to valve sealing supports of different specifications and sizes.

[0009] The lifting mechanism, which is fixedly installed on the main frame, is used to drive the clamping mechanism to move up and down, immerse the valve in the test water tank for underwater pressure testing, and remove the valve from the test water tank.

[0010] The support mechanism, which is mounted on the clamping mechanism, is used to support and seal the speed reducer mounting face of the valve.

[0011] Preferably, the lifting mechanism includes a fixed frame fixedly installed on the upper end of the main frame, a lead screw is rotatably installed on the fixed frame, and a lifting motor for driving the lead screw to rotate is fixedly installed at the upper end of the fixed frame; a lifting slide is threadedly connected to the lead screw, the lifting slide is slidably connected to the fixed frame, and the clamping mechanism is installed on the lifting slide through a mounting shaft.

[0012] Preferably, the lifting slide is provided with a flipping mechanism, which is used to drive the clamping mechanism to rotate at different angles to adapt to the corresponding installation angle pressure test of valves with different installation angles;

[0013] The flipping mechanism includes a flipping cylinder fixedly installed on a lifting slide. The output end of the flipping cylinder is fixedly connected to a cylinder connecting plate. A drive rack is fixedly connected to the cylinder connecting plate. The drive rack is slidably connected to the lifting slide. The mounting shaft is rotatably installed on the lifting slide, and a transmission rack that meshes with the drive rack is fixedly provided on the mounting shaft.

[0014] Preferably, a fixed sealing plate is fixedly provided at the upper end of the clamping bracket, a second lead screw is rotatably installed on the upper part of the clamping bracket, a clamping motor for driving the second lead screw to rotate is fixedly installed on the side wall of the clamping bracket, a lead screw slide is threadedly connected to the second lead screw, the upper end of the lead screw slide is slidably connected to the lower end of the fixed sealing plate, and the lower end of the lead screw slide is fixedly connected to the movable sealing plate.

[0015] Preferably, the support mechanism includes a lifting guide rail mounted on a clamping bracket, a lifting base plate slidably mounted on the lifting guide rail, and a support base plate for sealing the valve fixedly mounted on the upper end of the lifting base plate; a worm gear screw jack is mounted on the clamping bracket, and a connecting screw is helically connected to the worm gear screw jack, with the lower end of the connecting screw rotatably connected to the lifting base plate.

[0016] Preferably, the support mechanism further includes a transverse guide rail fixedly mounted on the clamping bracket. The transverse guide rail is perpendicular to the support cylinder. A transverse slider is slidably connected to the transverse guide rail. A lifting guide rail is fixedly connected to the lower end of the transverse slider and slidably fits against the side wall of the clamping bracket. A worm gear screw jack is fixedly mounted on the transverse slider. A support cylinder is fixedly mounted on the clamping bracket. The output end of the support cylinder is fixedly connected to the transverse slider. By extending and retracting the support cylinder, the transverse slider is driven to slide laterally along the transverse guide rail, thereby adjusting the lateral position of the support base plate and supporting the sealing of the reducer mounting face for different valves.

[0017] Preferably, the sealing and inflation mechanism includes a mounting base fixedly installed on a fixed sealing plate and a movable sealing plate. A guide plate is fixedly provided at one end of the mounting base. The guide plate is provided with a plurality of guide grooves arranged in a circular array. A top-pressing mechanism that extends and retracts radially along the guide plate is installed at the guide groove. The radially extending top-pressing mechanism is used to support the inner wall of the valve flange inlet and outlet. An inflatable sealing air bladder is provided on the outer periphery of the guide plate. The sealing air bladder is used to seal the inner wall of the valve flange inlet and outlet. A through shaft hole is provided on the mounting base. A drive air pipe for driving the top-pressing mechanism to rotate and for inflating the sealing air bladder and the valve is rotatably installed at the shaft hole.

[0018] Preferably, the top-pressing mechanism includes a top-pressing slider slidably disposed on a guide groove, an arc-shaped pressure plate fixedly disposed at the end of the top-pressing slider away from the guide plate, a connecting pin fixedly disposed in the middle of the top-pressing slider, a drive support rod rotatably connected to the connecting pin, a drive connecting rod rotatably connected at the end of the drive support rod away from the connecting pin, and a drive connecting rod fixedly connected at the end of the drive connecting rod away from the drive support rod to a drive air pipe.

[0019] Preferably, a motor bracket is fixedly provided on the mounting base, a drive motor is fixedly installed on the motor bracket, and the output shaft of the drive motor is connected to the drive air pipe through a transmission belt.

[0020] Preferably, the driving air tube includes two driving outer tubes rotatably mounted at the shaft hole of the mounting seat, the driving outer tube having a sliding air guide inner tube, and the air guide inner tube having an end sealing plate on the side near the valve. The side wall of the driving outer tube near the valve has an outer tube through hole, and the side wall of the air guide inner tube has an inner tube through hole that mates with the outer tube through hole. The end sealing plate of the air guide inner tube has an end air hole. The sealing airbag has an airbag sleeve on the side near the valve. The airbag sleeve is rotatably connected to the driving outer tube and fixedly connected to the guide plate by a connecting rod. The side wall of the airbag sleeve has a sleeve through hole for inflating the valve.

[0021] When a valve needs to be pressure tested, first place the valve's reducer port on the support base plate. Then, adjust the valve's vertical and horizontal positions using a worm gear screw jack and support cylinder, aligning the valve's flange inlets and outlets with the fixed and movable sealing plates on both sides. Next, rotate the support top plate using a clamping motor to adjust the position of the movable sealing plate, causing the movable and fixed sealing plates to press and compress against the flange inlets and outlets at both ends, sealing them. Then, gas is injected into the sealing airbag through the inner gas guide tube. At this point, the side of the inner gas guide tube with the end sealing plate is tightly against the inner wall of the airbag sleeve. The airbag sleeve seals the end air holes, and the holes in the inner and outer tubes are coaxially connected, allowing gas to flow in through both the inner and outer tube holes. The air is inflated into the sealing bladder to seal the inner walls of the valve flange inlet and outlet. After sealing, the drive motor drives the drive outer tube to rotate, which in turn drives the drive connecting rod to rotate. Through the transmission of the drive support rod, the top pressure slider slides outward along the guide groove, so that the arc-shaped pressure plate presses against the inner walls of the valve inlet and outlet, thus supporting the valve and ensuring the stability of the connection during the pressure test. Subsequently, according to different installation angles of the valve, the extension and retraction of the tilting cylinder drives the drive rack to slide horizontally. The meshing of the drive rack and the transmission rack drives the clamping mechanism to rotate and adjust the different pressure test angles of the valve, so that the pressure test angle of the valve is the same as the actual installation angle, thereby improving the actual fit of the valve test and the accuracy of the pressure test.

[0022] The support base plate not only plays a supporting role during the valve pressure test installation process, but also provides continuous support to the valve during the pressure test. By forming a vertical support with the fixed and movable sealing plates on both sides, it ensures the stability of the valve during the pressure test and effectively reduces the problem of insufficient valve clamping stability caused by the fixed and movable sealing plates on both sides due to the weight of the valve.

[0023] After the valve is installed, the lifting mechanism moves the valve downwards and immerses it in water. Then, the inner air guide tube is pulled outwards, causing the end sealing plate of the inner air guide tube to separate from the end of the airbag sleeve. The end air hole on the end sealing plate is in a conductive state. Due to the outward sliding of the inner air guide tube, the outer tube through hole and the inner tube through hole are misaligned and separated. Thus, both the outer tube through hole and the inner tube through hole are in a closed state. At this time, the air source flows to the airbag sleeve through the end air hole, and then flows into the valve through the sleeve through hole, realizing the inflation of the valve and completing the pressure test of the valve.

[0024] The beneficial effects of this invention are as follows: The direct clamping and sealing method using a fixed sealing plate and a movable sealing plate significantly reduces operational complexity. Simultaneously, the sliding arrangement of the movable sealing plate and the adjustable support dimensions of the sealing and inflation mechanism allow the device to adapt to valves of different specifications, improving its versatility. Furthermore, the introduction of the support mechanism effectively distributes the valve's weight, avoiding instability caused by weight concentration, thereby improving the reliability of the pressure testing process. Attached Figure Description

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] Figure 1 This is a three-dimensional structural diagram of the entire invention;

[0027] Figure 2 This is a side view of the overall structure of the present invention;

[0028] Figure 3 This is a top view of the overall structure of the invention;

[0029] Figure 4 This is the present invention. Figure 3 Schematic diagram of the cross-sectional structure along the AA direction;

[0030] Figure 5 This is a three-dimensional structural schematic diagram of the sealing and inflation mechanism of the present invention;

[0031] Figure 6 This is a schematic diagram of the axial structure of the sealing and inflation mechanism of the present invention;

[0032] Figure 7 This is a front view schematic diagram of the sealing and inflation mechanism of the present invention;

[0033] Figure 8 This is the present invention. Figure 7 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0034] Figure 9 This is the present invention. Figure 7 Schematic diagram of the cross-sectional structure in the CC direction;

[0035] Figure 10 This is a schematic diagram of the structure of the sealing inflation mechanism of the present invention for removing the sealing airbag;

[0036] Figure 11 This is a schematic diagram of the BB-direction cross-sectional structure of the present invention for removing the sealing airbag.

[0037] In the diagram: 1. Main frame; 2. Test water tank; 3. Storage water tank; 4. Test air tank; 5. Lifting mechanism; 51. Fixed frame; 52. Lifting motor; 53. Lead screw one; 54. Lifting slide; 55. Mounting shaft; 6. Tilting mechanism; 61. Tilting cylinder; 62. Cylinder connecting plate; 63. Drive rack; 64. Transmission rack; 7. Clamping mechanism; 71. Clamping bracket; 72. Fixed sealing plate; 73. Bracket top plate; 74. Clamping motor; 75. Lead screw two; 76. Lead screw slide; 77. Movable sealing plate; 8. Sealing and inflation mechanism; 81. Mounting base; 82. Guide plate; 821. Guide groove; 83. Top pressure mechanism; 83 1. Top-pressing slider; 832. Arc-shaped pressure plate; 833. Drive support rod; 834. Drive connecting rod; 835. Connecting pin; 84. Sealing airbag; 841. Airbag sleeve; 842. Sleeve through hole; 85. Drive air pipe; 851. Drive outer pipe; 852. Inner air pipe; 853. Outer pipe through hole; 854. Inner pipe through hole; 855. End air hole; 86. Motor bracket; 87. Drive motor; 88. Transmission belt; 9. Support mechanism; 91. Support cylinder; 92. Transverse guide rail; 93. Transverse slider; 94. Worm gear screw jack; 95. Lifting guide rail; 96. Connecting screw; 97. Lifting base plate; 98. Support base plate. Detailed Implementation

[0038] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0039] Please see Figures 1-11 As shown, this embodiment of the invention provides a universal pressure testing device for multi-specification valves, comprising:

[0040] The main frame 1 serves as the main body for mounting the pressure testing device. A pressure testing water tank 2 is fixedly mounted on it. The upper end of the main frame 1 is used to add a storage water tank 3 for adding pressure testing water to the pressure testing water tank 2 and a pressure testing air tank 4 for providing an air source for valve pressure testing.

[0041] The clamping mechanism 7 is installed in the test pressure water tank 2 to fix and clamp the valve. The clamping mechanism 7 includes a clamping bracket 71. A fixed sealing plate 72 is fixedly installed in the clamping bracket 71 and a movable sealing plate 77 is movably installed. The fixed sealing plate 72 and the movable sealing plate 77 are used to clamp and seal the flange inlet and outlet on both sides of the valve, and the movable sealing plate 77 can be adapted to valves of different specifications.

[0042] The sealing and inflation mechanism 8 is fixedly installed on the fixed sealing plate 72 and the movable sealing plate 77. It is inserted into the flange inlet and outlet to support and seal the flange inlet and outlet. The support size of the sealing and inflation mechanism 8 is adjustable to adapt to valve sealing supports of different specifications and sizes.

[0043] The lifting mechanism 5 is fixedly installed on the main frame 1 and is used to drive the clamping mechanism 7 to move up and down, immerse the valve in the test pressure tank 2 for underwater pressure testing and remove the valve from the test pressure tank 2.

[0044] The support mechanism 9, which is mounted on the clamping mechanism 7, is used to support and seal the reducer mounting end face of the valve.

[0045] In practical applications, the main frame 1 can be understood as the foundation structure of the entire pressure testing device, its main function being to support and integrate other functional modules. For example, the main frame 1 can be fixedly connected to other components by welding or bolting, and its material can be metal to meet strength requirements. The pressure testing water tank 2, as the core container for pressure testing, can be designed in a rectangular or cylindrical shape, depending on the actual application scenario. The storage water tank 3 and the pressure testing gas tank 4 can be installed in a suspended or embedded manner to facilitate maintenance and replenishment by operators.

[0046] The clamping bracket 71 in the clamping mechanism 7 can adopt a frame structure, with its internal space used to accommodate the valve to be tested. The clamping and sealing function of the fixed sealing plate 72 and the movable sealing plate 77 can be achieved through elastic materials or mechanical locking devices. For example, the fixed sealing plate 72 can be set as a rigid structure, while the movable sealing plate 77 can be adjusted in position by slide rails or guide rods to adapt to the flange inlet and outlet sizes of valves of different specifications. In addition, the sliding drive of the movable sealing plate 77 can be achieved by manual adjustment, hydraulic drive, or electric push rod.

[0047] The adjustable support dimension of the sealing inflation mechanism 8 can be achieved in several ways. For example, the sealing inflation mechanism 8 can be configured as a multi-segment telescopic structure, with each segment connected by springs or cylinders to achieve automatic length adjustment. Alternatively, the sealing inflation mechanism 8 can be made of flexible material, changing its support dimension by inflation to adapt to valve flange inlets and outlets of different specifications.

[0048] The function of the lifting mechanism 5 can be achieved in various ways. For example, the lifting mechanism 5 can use chain drive, rack and pinion drive, or hydraulic cylinder drive to achieve the lifting and moving of the clamping mechanism 7. In addition, the lifting mechanism 5 can also be equipped with limit switches or sensors to precisely control the lifting height of the clamping mechanism 7, thereby ensuring that the valve can be accurately immersed in the designated position in the test pressure tank 2.

[0049] The function of the support mechanism 9 is to support the reducer mounting face of the valve. This support can be achieved through various structural methods. For example, the support mechanism 9 can be configured as an adjustable-height support column, with a support plate at the top that matches the reducer mounting face. Alternatively, the support mechanism 9 can adopt an air-bag type support structure, adjusting the support height by inflating or deflating the air to accommodate the installation requirements of valves of different specifications.

[0050] The innovation of this application lies in constructing an integrated pressure testing system by integrating the main frame, clamping mechanism, sealing and inflation mechanism, lifting mechanism, and support mechanism. This effectively addresses the challenges of operational efficiency, clamping stability, and specification compatibility in valve pressure testing. Compared to the flange connection method relying on bolts for disassembly and assembly in traditional technologies, this application significantly reduces operational complexity through a direct clamping and sealing method using fixed and movable sealing plates. Simultaneously, the sliding configuration of the movable sealing plate and the adjustable support dimensions of the sealing and inflation mechanism allow the device to adapt to valves of different specifications, improving the equipment's versatility. Furthermore, the introduction of the support mechanism effectively distributes the valve's weight, avoiding clamping instability caused by weight concentration, thereby improving the reliability of the pressure testing process.

[0051] The working principle of this embodiment is as follows: The main frame 1 serves as the installation base for the entire pressure testing device, on which a pressure testing water tank 2 is fixedly mounted. A storage water tank 3 and a pressure testing air tank 4 are integrated at the upper end of the main frame 1 to provide water and air sources for the pressure testing process. A clamping mechanism 7 is located inside the pressure testing water tank 2, and clamps and seals the flange inlets and outlets on both sides of the valve through a fixed sealing plate 72 and a movable sealing plate 77 within a clamping bracket 71. The movable sealing plate 77 can slide and adjust its position to accommodate valves of different specifications, thus solving the problem of cumbersome operation in traditional flange connection methods. A sealing and inflation mechanism 8 is fixedly installed on the fixed sealing plate 72 and the movable sealing plate 77, and provides support and sealing by inserting into the flange inlet and outlet. Its support dimensions are adjustable, further ensuring reliable sealing for valves of different specifications and avoiding leakage risks due to size mismatch. The lifting mechanism 5 is fixedly installed on the main frame 1. By driving the clamping mechanism 7 to move up and down, it automatically immerses the valve into the test water tank 2 for underwater pressure testing. After the test, the valve is removed, reducing manual intervention and improving testing efficiency. The support mechanism 9 is installed on the clamping mechanism 7 to support and seal the valve's reducer mounting face, effectively distributing the valve's weight and preventing instability caused by weight concentration at the flange connection. Thus, all mechanisms work together: the clamping mechanism 7 and the sealing and inflation mechanism 8 work together to achieve rapid sealing and specification adaptation; the support mechanism 9 provides additional support to balance the weight; and the lifting mechanism 5 achieves automated movement. Ultimately, this forms a highly efficient and stable pressure testing system, solving the technical problems of cumbersome operation, unstable clamping, and difficulty in adapting to multiple valve specifications.

[0052] For further details, please refer to Figure 1 Figure 4 As shown, the lifting mechanism 5 includes a fixed frame 51 fixedly installed on the upper end of the main frame 1. A lead screw 53 is rotatably installed on the fixed frame 51. A lifting motor 52 for driving the lead screw 53 to rotate is fixedly installed at the upper end of the fixed frame 51. A lifting slide 54 is threadedly connected to the lead screw 53. The lifting slide 54 is slidably connected to the fixed frame 51. The clamping mechanism 7 is installed on the lifting slide 54 through the mounting shaft 55.

[0053] Specifically, the fixed frame 51 refers to the basic structure that provides stable support for the entire lifting mechanism. It can be fixed to the main frame 1 by welding or bolting to ensure overall rigidity during the lifting process. The lead screw 53 is a key component that converts rotary motion into linear motion. It can be implemented using trapezoidal threads or ball threads to ensure transmission accuracy and self-locking performance. The lifting motor 52 serves as the power source and can be a stepper motor or servo motor to achieve precise speed control and position positioning. The lifting slide 54 is an important component that supports the clamping mechanism. It can achieve its guiding function through linear guides or a slider structure to limit lateral freedom.

[0054] In detail, this solution uses a fixing frame 51 to firmly anchor the lifting mechanism to the main frame 1, effectively isolating the clamping mechanism from external vibrations. The threaded engagement between the lead screw 53 and the lifting slide 54 achieves precise linear displacement, and its high lead accuracy ensures that the valve maintains a constant posture during lifting. The controllable speed output of the lifting motor 52 replaces the traditional non-adjustable power source, avoiding sudden acceleration changes during lifting through uniform rotation. This is particularly effective against the inertial effects of heavy valves, achieving smooth start-stop without impact. The sliding connection between the lifting slide 54 and the fixing frame 51 constrains the lateral degree of freedom, allowing the clamping mechanism to maintain a horizontal reference during movement and preventing misalignment between the valve flange inlet / outlet and the sealing plate. The rigid connection of the mounting shaft 55 not only transmits precise displacement but also isolates the rotational component, ensuring reliable contact between the sealing and inflation mechanism and the inner wall of the flange.

[0055] The above technical solution solves the problem of sealing failure caused by unstable lifting and lowering, while improving the stability of the clamping mechanism during the lifting and lowering process, thus ensuring the accuracy of pressure testing. Furthermore, this solution works effectively with the clamping mechanism 7, enabling the valve to maintain a constant posture when immersed in water, significantly improving the reliability of the pressure testing process.

[0056] For further details, please refer to Figure 1 Figure 4As shown, the flipping mechanism 6 is mounted on the lifting slide 54 and is used to drive the clamping mechanism 7 to rotate at different angles to adapt to the corresponding installation angle pressure test of valves with different installation angles. The flipping mechanism 6 includes a flipping cylinder 61 fixedly mounted on the lifting slide 54. The output end of the flipping cylinder 61 is fixedly connected to a cylinder connecting plate 62. A drive rack 63 is fixedly connected to the cylinder connecting plate 62. The drive rack 63 is slidably connected to the lifting slide 54. The mounting shaft 55 is rotatably mounted on the lifting slide 54, and a transmission rack 64 that meshes with the drive rack 63 is fixedly mounted on the mounting shaft 55.

[0057] Specifically, the tilting mechanism 6 refers to a device that achieves angle adjustment through mechanical transmission, which can be driven pneumatically, hydraulically, or electrically. The tilting cylinder 61 is a power element that converts linear motion into rotational motion. It provides controllable thrust through the extension and retraction of its built-in piston rod, ensuring a smooth and precise angle adjustment process. The cylinder connecting plate 62, as a rigid connecting component, efficiently transmits the linear motion of the tilting cylinder 61 to the drive rack 63 while maintaining motion synchronization and avoiding power loss. The drive rack 63 is a linear motion component with a toothed structure; its sliding design effectively reduces frictional resistance and ensures smooth movement. The meshing connection between the transmission rack 64 and the drive rack 63 realizes the conversion of linear motion into rotational motion, thereby providing precise control for the angle adjustment of the clamping mechanism 7.

[0058] Specifically, this solution utilizes the telescopic movement of the tilting cylinder 61 to drive the cylinder connecting plate 62, which in turn drives the rack 63 to slide along the lifting slide 54. The linear motion of the rack 63 is converted into the rotational motion of the mounting shaft 55 through meshing with the transmission rack 64, thereby achieving dynamic adjustment of the angle of the clamping mechanism 7. The tilting cylinder 61, as the core power source, provides stable driving force through its telescopic movement; the cylinder connecting plate 62, as an intermediate transmission component, ensures efficient and synchronous power transmission; the meshing design of the rack 63 and the transmission rack 64 precisely converts linear motion into rotational displacement, achieving stepless angle adjustment of the clamping mechanism 7. Furthermore, the rotating mounting structure of the mounting shaft 55 directly supports the clamping mechanism 7 and allows it to rotate freely, ensuring the valve maintains overall stability during angle adjustment and preventing seal failure due to center of gravity shift. This combination of pneumatic drive and rack and pinion transmission not only enables flexible switching of the pressure test angle but also ensures the reliability and repeatability of the adjustment process through a mechanical linkage mechanism, making the pressure test environment highly consistent with the actual usage conditions.

[0059] The above technical solution solves the problem of existing technologies that only support single-angle pressure testing in vertical or horizontal directions, enabling pressure testing to accurately match actual installation conditions and significantly improving the accuracy and reliability of test results. Furthermore, this solution, combined with the design of the lifting mechanism 5 and the clamping mechanism 7, further enhances the adaptability of the pressure testing device to valves of different specifications, forming a complete technical system that effectively meets the needs of multi-angle pressure testing.

[0060] For further details, please refer to Figure 1 Figure 4 As shown, a fixed sealing plate 72 is fixedly installed on the upper end of the clamping bracket 71, a second lead screw 75 is rotatably installed on the upper part of the clamping bracket 71, a clamping motor 74 for driving the second lead screw 75 to rotate is fixedly installed on the side wall of the clamping bracket 71, a lead screw slide 76 is threadedly connected to the second lead screw 75, the upper end of the lead screw slide 76 is slidably connected to the lower end of the fixed sealing plate 72, and the lower end of the lead screw slide 76 is fixedly connected to the movable sealing plate 77.

[0061] Specifically, the fixed sealing plate 72 refers to the structure that serves as a stable reference sealing surface. It can be implemented using a metal sheet and a sealing gasket, aiming to ensure a reliable seal on one side of the valve and provide a fixed reference point for the movement of the movable sealing plate 77. The lead screw 75 can be understood as a transmission component with a threaded structure, which can efficiently convert rotary motion into linear displacement. This can be achieved through a trapezoidal thread or a ball screw, etc., to achieve fine-tuning precision control to adapt to different valve specifications. In practical applications, the clamping motor 74 refers to the device that provides a controllable power source. It can be implemented using a stepper motor or a servo motor, aiming to automatically drive the lead screw 75 to rotate according to the control signal, avoiding human error. Furthermore, the lead screw slide 76 is a sliding component that works with the lead screw 75 to achieve linear motion. It can be implemented through a combination of a metal slider and a guide groove, aiming to ensure smooth and repeatable movement.

[0062] In detail, this solution uses a fixed sealing plate 72 as a reference sealing surface, combined with the cooperation of a lead screw 75 and a clamping motor 74, to achieve automated and precise adjustment of the movable sealing plate 77. The fixed connection between the fixed sealing plate 72 and the clamping bracket 71 ensures the stability of the reference surface, maintaining its position even under the weight of the valve. The lead screw 75 converts the rotational motion of the clamping motor 74 into the linear displacement of the lead screw slide 76 through a threaded structure. This conversion method is not only highly efficient but also has a self-locking characteristic, effectively preventing backlash caused by the weight of the valve. The sliding connection between the upper end of the lead screw slide 76 and the lower end of the fixed sealing plate 72 constrains the movement trajectory, ensuring the stability of linear movement. At the same time, the fixed connection between its lower end and the movable sealing plate 77 eliminates gaps in the intermediate links, ensuring a tight fit between the sealing surfaces. The above structural design is particularly suitable for the size differences of valves of different specifications, demonstrating significant advantages in solving the problems of insufficient stability and cumbersome operation during clamping.

[0063] The above technical solution not only realizes the automated and precise adjustment of the movable sealing plate 77, but also effectively solves the problem of unstable clamping caused by the weight of the valve, thereby improving the accuracy and efficiency of pressure testing.

[0064] For further details, please refer to Figure 1 Figure 4 As shown, the support mechanism 9 includes a lifting guide rail 95 mounted on the clamping bracket 71, a lifting base plate 97 slidably mounted on the lifting guide rail 95, and a support base plate 98 for sealing the valve fixedly mounted on the upper end of the lifting base plate 97; a worm gear screw jack 94 is mounted on the clamping bracket 71, and a connecting screw 96 is helically connected to the worm gear screw jack 94, with the lower end of the connecting screw 96 rotatably connected to the lifting base plate 97.

[0065] In practical applications, the lifting guide rail 95 refers to the structure that provides a vertical guiding path for the lifting base plate 97. It can be implemented using linear guide rails, dovetail guide rails, or cylindrical guide rails. Its purpose is to ensure that the lifting base plate 97 maintains precise linear motion during movement and avoids horizontal deviation. The lifting base plate 97 can be understood as an intermediate component that supports the base plate 98 and enables height adjustment. It achieves sliding functionality through a slider and guide rail, dynamically adapting to the height differences of valves of different specifications. Specifically, the worm gear screw jack 94 is a transmission device that converts rotary motion into linear motion. It can be implemented using a single-start worm gear structure or a multi-start worm gear structure, aiming to achieve stable locking of the support height through self-locking characteristics. Furthermore, the connecting screw 96 is a key component for transmitting lifting motion. It can be implemented using a trapezoidal thread screw or a ball screw, aiming to convert the rotary motion of the worm gear screw jack 94 into the linear displacement of the lifting base plate 97.

[0066] In detail, this solution effectively solves the problem of mismatched support heights by constructing a precisely adjustable vertical support system. The lifting guide rail 95 provides a rigid guide path for the lifting base plate 97, ensuring no horizontal deviation during vertical movement, thus guaranteeing precise alignment between the support base plate 98 and the valve reducer mounting face. The sliding design of the lifting base plate 97 on the guide rail allows the support base plate 98 to dynamically adjust its height as the base plate moves, adapting to the different end face positions of various valves. The support base plate 98 is fixed to the upper end of the lifting base plate 97, directly bearing the weight of the valve and achieving end face sealing, avoiding seal failure due to height deviation. The worm gear screw jack 94 is mounted on the clamping bracket 71, and its helical lifting connection screw 96 converts rotational motion into linear motion. Based on the self-locking characteristics of the worm gear screw, it achieves stable locking of the support height, preventing the valve from sinking due to gravity during pressure testing. The rotating connection design between the lower end of the connecting screw 96 and the lifting base plate 97 eliminates mechanical stress caused by angular deviation during lifting, ensuring smooth and reliable movement. This technical solution not only improves the clamping stability during pressure testing of valves of various specifications but also significantly enhances the accuracy of seal testing, exhibiting excellent support performance, especially when handling large or heavy valves.

[0067] For further details, please refer to Figure 1 Figure 4 As shown, the support mechanism 9 also includes a transverse guide rail 92 fixedly mounted on the clamping bracket 71. The transverse guide rail 92 is perpendicular to the support cylinder 91. A transverse slider 93 is slidably connected to the transverse guide rail 92. A lifting guide rail 95 is fixedly connected to the lower end of the transverse slider 93 and slides against the side wall of the clamping bracket 71. A worm gear screw jack 94 is fixedly mounted on the transverse slider 93. A support cylinder 91 is fixedly mounted on the clamping bracket 71. The output end of the support cylinder 91 is fixedly connected to the transverse slider 93. The extension and retraction of the support cylinder 91 drives the transverse slider 93 to slide laterally along the transverse guide rail 92, thereby adjusting the transverse position of the support base plate 98 and supporting the sealing of the reducer mounting face for different valves.

[0068] Specifically, the transverse guide rail 92 refers to the guide structure used to provide a lateral movement path, which can be implemented using linear guide rails, ball guide rails, or sliding guide rails. The transverse slider 93 is a sliding component used in conjunction with the transverse guide rail 92, its purpose being to ensure smooth and reliable lateral displacement through a low-friction sliding interface. The lifting guide rail 95 refers to the guide structure used to achieve vertical adjustment, which can be implemented using slide rails, racks, or screws. The worm gear screw jack 94 is a device that converts rotary motion into linear motion, its purpose being to achieve precise vertical position adjustment. The support cylinder 91 refers to the power device used to provide lateral thrust, which can be driven by pneumatic, hydraulic, or electric means, its purpose being to achieve rapid, stepless lateral displacement.

[0069] In detail, this technical solution addresses the lack of horizontal adjustment capability in the support mechanism by integrating a lateral movement function. The lateral guide rail 92, fixed to the clamping bracket 71, serves as the reference track for lateral movement. Its perpendicular distribution to the support cylinder 91 ensures strict alignment of the thrust direction with the movement path, preventing jamming or offset due to angular deviations. The lateral slider 93 is slidably connected to the lateral guide rail 92, forming a low-friction sliding interface, ensuring smooth and reliable lateral displacement. The lifting guide rail 95 is fixed to the lower end of the lateral slider 93 and slidably fits against the side wall of the clamping bracket 71, rigidly connecting the vertical adjustment mechanism to the lateral movement platform. This maintains the independence of the lifting function while enhancing the overall structure's anti-sway capability through side wall contact. The worm gear screw jack 94 is fixed to the lateral slider 93, allowing vertical adjustment to change synchronously with the lateral position, preventing misalignment caused by individual adjustments. The support cylinder 91 is mounted on the clamping bracket 71 and directly drives the transverse slider 93. Utilizing precise air pressure control, it achieves rapid, stepless lateral displacement, replacing the traditional manual adjustment method and significantly improving adaptation efficiency. The extension and retraction of the support cylinder 91 drives the transverse slider 93 to slide along the guide rail, dynamically adjusting the lateral coordinates of the support base plate 98. This ensures that the support base plate 98 matches the horizontal position of the valve reducer mounting face in real time, eliminating alignment errors caused by specification differences. This ensures uniform pressure on the end face when the sealing airbag inflates, preventing localized leakage. Simultaneously, it provides stable three-point support for the valve, effectively dispersing stress concentration caused by the valve's own weight and preventing the valve from tilting or falling off during pressure testing.

[0070] The above technical solution not only enables flexible adjustment of the support mechanism in the horizontal direction, but also forms a complete multi-degree-of-freedom adjustment system by combining it with the vertical adjustment function, which significantly improves the adaptability and stability of valves of different specifications during pressure testing.

[0071] For further details, please refer to Figure 5 Figure 11 As shown, the sealing and inflation mechanism 8 includes a mounting base 81 fixedly installed on the fixed sealing plate 72 and the movable sealing plate 77. A guide plate 82 is fixedly provided at one end of the mounting base 81. The guide plate 82 is provided with a plurality of guide grooves 821 arranged in a circular array. A top-pressing mechanism 83 that extends and retracts radially along the guide plate 82 is installed at the guide grooves 821. The radially extending top-pressing mechanism 83 is used to support the inner wall of the valve flange inlet and outlet. An inflatable sealing air bladder 84 is provided on the outer periphery of the guide plate 82. The sealing air bladder 84 is used to seal the inner wall of the valve flange inlet and outlet. A through shaft hole is provided on the mounting base 81. A drive air pipe 85 is rotatably installed at the shaft hole for driving the top-pressing mechanism 83 to rotate and for inflating the sealing air bladder 84 and the valve.

[0072] Specifically, the mounting base 81 refers to the component that provides a stable mounting foundation for the entire sealing and inflation mechanism 8. It can be implemented using a fixed bracket structure made of metal material, with the purpose of ensuring that the mechanism will not shift due to valve weight or internal pressure during the pressure test. The guide plate 82 can be understood as a positioning device with precise guiding function, which can be implemented by setting multiple annularly distributed guide grooves 821, with the purpose of providing a uniform radial displacement path for the pressure-pressing mechanism 83. In practical applications, the pressure-pressing mechanism 83 refers to a support component that can extend and retract radially along the guide plate 82. It can be implemented using a structure of slider and guide groove cooperation, with the purpose of adapting to the support requirements of valves of different specifications. The sealing airbag 84 refers to a sealing element with elastic deformation characteristics, which can be implemented using an inflatable structure made of rubber material, with the purpose of achieving a reliable leak-free seal. The drive air pipe 85 can be understood as a composite component integrating rotation and airflow delivery functions. It can be implemented by setting a through-hole structure, with the purpose of simultaneously completing the adjustment of the pressure-pressing mechanism 83 and the inflation operation of the sealing airbag 84.

[0073] Specifically, this technical solution securely fixes the entire sealing and inflation mechanism 8 to the fixed sealing plate 72 and the movable sealing plate 77 via the mounting base 81, ensuring the stability of the overall structure. The annular array of guide grooves 821 on the guide disc 82 provides a precise radial movement trajectory for the pressure mechanism 83, enabling it to maintain synchronous movement when adapting to valves of different specifications and avoiding localized stress concentration. The sealing airbag 84 is located on the outer periphery of the guide disc 82; when inflated, it tightly conforms to the inner wall of the valve flange inlet and outlet. This sealing method based on the airbag's adaptive deformation can cover the inner wall contours of valves of different sizes. The drive air pipe 85 is rotatably mounted at the shaft hole of the mounting base 81. Its rotation drives the pressure mechanism 83 to perform radial adjustment, while simultaneously inflating the sealing airbag 84 and the valve through its internal airflow channel, achieving coordinated support and sealing actions. This design not only solves the problems of uneven support and incomplete sealing during pressure testing of multi-specification valves but also significantly improves operational efficiency, forming a complete solution.

[0074] The above technical solution effectively overcomes the problem of the lack of specific adjustable structure in the support and sealing mechanism in the existing technology, and realizes reliable support and sealing for the inlet and outlet of valve flanges of different specifications, ensuring the accuracy of pressure testing.

[0075] For further details, please refer to Figure 5 Figure 11As shown, the top-pressing mechanism 83 includes a top-pressing slider 831 slidably disposed on the guide groove 821. An arc-shaped pressure plate 832 is fixedly disposed at one end of the top-pressing slider 831 away from the guide plate 82. A connecting pin 835 is fixedly disposed in the middle of the top-pressing slider 831. A drive support rod 833 is rotatably connected to the connecting pin 835. A drive connecting rod 834 is rotatably connected at one end of the drive support rod 833 away from the connecting pin 835. The end of the drive connecting rod 834 away from the drive support rod 833 is fixedly connected to the drive air pipe 85.

[0076] Specifically, the top-pressure slider 831 refers to a sliding component capable of linear motion in the radial direction within the guide groove 821, which can be implemented using structures such as ball bearings or linear bearings. The arc-shaped pressure plate 832 is a support component with a curved surface design, designed to closely fit the inner wall contour of the valve flange inlet and outlet, thereby providing a uniformly distributed support force. The connecting pin 835 serves as the rotation fulcrum of the drive rod 833, and its rotation function can be achieved through pins, hinges, or other revolute joints. The drive rod 833 and the drive connecting rod 834 together constitute a double-linkage mechanism, which can efficiently convert the rotational motion of the drive air pipe 85 into linear push-pull action, ensuring the synchronous extension and retraction of multiple top-pressure sliders 831.

[0077] In detail, the above solution uses a mechanical linkage structure to convert the rotational motion of the drive air pipe 85 into the radial linear motion of the top-pressure slider 831, thereby achieving automatic synchronization and precise control of the support action. The top-pressure slider 831 is slidably mounted on the guide groove 821, ensuring that the movement path strictly follows the radial direction of the guide plate 82, avoiding uneven force due to offset. The arc-shaped pressure plate 832 is fixed to the outer end of the top-pressure slider 831, and its curved surface design can closely fit the inner wall contour of the valve flange, providing uniformly distributed support force and effectively resisting the sagging deformation caused by the valve's own weight. The connecting pin 835 is located in the middle of the top-pressure slider 831, serving as the rotation fulcrum of the drive support rod 833, making the transmission path of the driving force more in line with the lever principle, reducing motion resistance and improving action sensitivity. The drive support rod 833 and the drive connecting rod 834 are rotatably connected to form a double-linkage mechanism, efficiently converting the rotational motion of the drive air pipe 85 into linear push-pull action, ensuring that multiple top-pressure sliders 831 extend and retract synchronously, avoiding local sealing failure due to asynchrony. The end of the drive linkage 834 is fixedly connected to the drive air pipe 85. It directly uses the circumferential displacement generated when the drive air pipe 85 rotates as the power source, without the need for an additional drive device, which simplifies the overall structure and improves the energy transfer efficiency.

[0078] Based on this, the above-mentioned scheme forms an organic whole with the guide plate 82, sealing airbag 84, and other structures. The guide groove 821 on the guide plate 82 not only provides precise radial guidance for the top-pressure slider 831 but also ensures the stability of the support action. At the same time, the rotational movement of the drive air pipe 85 is used to drive the top-pressure mechanism 83 and simultaneously complete the inflation process of the sealing airbag 84, enabling the support action and sealing operation to be carried out in coordination, significantly improving the adaptability and operational reliability of pressure testing for multiple valve specifications. Through the above technical solution, the problem of precise synchronization and stable control of the support action is solved, effectively improving the stability of clamping and the accuracy of detection during valve pressure testing.

[0079] For further details, please refer to Figure 5 Figure 11 As shown, a motor bracket 86 is fixedly installed on the mounting base 81, and a drive motor 87 is fixedly installed on the motor bracket 86. The output shaft of the drive motor 87 is connected to the drive air pipe 85 through a transmission belt 88.

[0080] Specifically, the motor bracket 86 refers to the foundation structure that provides stable support for the drive motor 87. It can be made by bending or casting metal sheets to ensure the precise and reliable installation position of the drive motor 87, thus providing a stable support foundation for subsequent transmission. The drive motor 87 can be understood as the power source of the entire pressing mechanism. It can be implemented using a stepper motor or a servo motor, with the aim of ensuring the smoothness and consistency of the pressing action by precisely controlling the rotation angle and speed. In practical applications, the transmission belt 88 is a key component used to establish a flexible transmission connection. It can be implemented using common transmission belts such as synchronous belts or V-belts, with the aim of effectively absorbing vibration and impact during rotation and preventing component wear or positional misalignment caused by rigid transmission.

[0081] In detail, this solution achieves automated control of the rotation of the drive air pipe 85 by constructing a complete motor drive system, thereby precisely adjusting the action of the top-pressure mechanism. The motor bracket 86 is fixed on the mounting base 81, providing a stable mounting foundation for the drive motor 87 and ensuring the reliability of power transmission. As the core power source, the drive motor 87's output shaft is flexibly connected to the drive air pipe 85 via the transmission belt 88, enabling the motor's rotational motion to be efficiently converted into the synchronous rotation of the drive air pipe 85. This design avoids the tedious process of manually operating the drive air pipe 85. By precisely controlling the rotation angle and speed of the motor, it ensures that the radial extension and retraction of the top-pressure slider 831 along the guide groove 821 is smooth and consistent, thus making the support force of the arc-shaped pressure plate 832 on the inner wall of the valve inlet and outlet uniform and controllable. The flexible connection characteristics of the transmission belt 88 not only effectively absorb the vibration and impact during rotation but also significantly reduce the risk of wear between components, ensuring that the top-pressure mechanism maintains high repeatability accuracy during repeated actions. Based on this, the technology works in tandem with the sealing and inflation mechanism 8, significantly improving the adaptability to valves of different specifications, making the sealing process more efficient and reliable, and laying a key foundation for the accuracy of valve pressure testing.

[0082] The above technical solutions not only solve the problems of low efficiency and difficulty in ensuring accuracy in traditional manual operation, but also achieve stability and consistency of top pressure action through an automated drive mechanism, significantly improving the overall accuracy and reliability of valve pressure testing.

[0083] Furthermore, the drive air pipe 85 includes a drive outer pipe 851 rotatably mounted at the shaft hole of the mounting base 81, with two ends passing through it. An inner air guide pipe 852 is slidably disposed inside the drive outer pipe 851, and an end sealing plate is provided on the side of the inner air guide pipe 852 near the valve. An outer pipe through hole 853 is provided on the side wall of the drive outer pipe 851 near the valve, and an inner pipe through hole 854 that cooperates with the outer pipe through hole 853 is provided on the side wall of the inner air guide pipe 852. An end air hole 855 is provided on the end sealing plate of the inner air guide pipe 852. An air bag seat 841 is provided on the side of the sealing air bag 84 near the valve. The air bag seat 841 is rotatably connected to the drive outer pipe 851 and fixedly connected to the guide plate 82 by a connecting rod. A seat through hole 842 for inflating the valve is fixedly provided on the side wall of the air bag seat 841.

[0084] Specifically, the driving outer tube 851 is a tubular component with a through-hole structure at both ends. It can be made of metal or high-strength composite materials, and its purpose is to provide a stable sliding track for the inner air-guiding tube 852 while ensuring the continuity of the gas channel during rotation. The inner air-guiding tube 852 is a tubular structure that can slide axially. It can be precisely machined to achieve a tight fit with the driving outer tube 851, and its purpose is to trigger the switching mechanism of the inflation path according to the position change. The end sealing plate is part of the inner air-guiding tube 852, and its function is to dynamically control the opening and closing state of the end air hole 855 to avoid gas flow conflicts. The matching mechanism of the outer tube through hole 853 and the inner tube through hole 854 can realize the opening or closing of the path according to the relative displacement, ensuring no leakage during the sealing stage. The airbag sleeve 841 is a component that is rotatably connected to the driving outer tube 851. It can be fixed to the guide plate 82 by a connecting rod, and its purpose is to maintain the stability of the sealed airbag 84 and ensure the accuracy of gas introduction.

[0085] Specifically, this technical solution achieves dynamic switching of the inflation path through innovative design. The outer drive tube 851, as a core component, not only transmits the rotational force of the drive motor 87 to drive the pressure-generating mechanism 83, but also provides a stable sliding track for the inner air guide tube 852. The sliding configuration of the inner air guide tube 852 is crucial. When it moves inward until the end sealing plate is tightly against the airbag sleeve 841, the inner tube through-hole 854 and the outer tube through-hole 853 are precisely aligned. Gas flows into the sealing airbag 84 through this path to complete the flange seal. At this time, the physical sealing effect of the end sealing plate blocks the end air hole 855, preventing gas from accidentally entering the valve. When the inner air guide tube 852 is pulled outward, the end sealing plate separates from the airbag sleeve 841, opening the end air hole 855. Simultaneously, the inner tube through-hole 854 and the outer tube through-hole 853 are misaligned and isolated. Gas then flows through the end air hole 855 to the sleeve through-hole 842 to enter the valve for pressure testing. This path switching based on the sliding of the inner air guide tube 852 requires no external intervention, significantly simplifying the operation process. Furthermore, this design, together with components such as the support base plate 98, fixed sealing plate 72, and movable sealing plate 77, ensures the valve remains stable during pressure testing, effectively improving the continuity and reliability of the pressure testing process.

[0086] The above technical solution solves the problem of cumbersome gas filling operations during the sealing and testing stages caused by the lack of a dynamic position adjustment mechanism in traditional pressure testing devices, and significantly improves testing efficiency and the reliability of pressure test results.

[0087] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A universal pressure testing device for multi-specification valves, characterized in that: include: The main frame (1) serves as the main body for installing the pressure testing device, and a pressure testing water tank (2) is fixedly installed on it. The upper end of the main frame (1) is used to add a storage water tank (3) for adding pressure testing water to the pressure testing water tank (2) and a pressure testing air tank (4) for providing air source for valve pressure testing. The clamping mechanism (7) is installed in the test pressure water tank (2) for fixing and clamping the valve. The clamping mechanism (7) includes a clamping bracket (71). A fixed sealing plate (72) is fixedly installed in the clamping bracket (71) and a movable sealing plate (77) is movably installed. The fixed sealing plate (72) and the movable sealing plate (77) are respectively used to clamp and seal the flange inlet and outlet of the valve on both sides. The movable sealing plate (77) can be adapted to valves of different specifications. The sealing inflation mechanism (8) is fixedly installed on the fixed sealing plate (72) and the movable sealing plate (77). It supports and seals the flange inlet and outlet by being inserted into the flange inlet and outlet. The support size of the sealing inflation mechanism (8) is adjustable to adapt to valve sealing supports of different specifications and sizes. The lifting mechanism (5) is fixedly installed on the main frame (1) and is used to drive the clamping mechanism (7) to move up and down, immerse the valve in the test pressure tank (2) for underwater pressure testing and remove the valve from the test pressure tank (2); The support mechanism (9) is mounted on the clamping mechanism (7) and is used to support and seal the speed reducer mounting end face of the valve.

2. The universal pressure testing device for multi-specification valves according to claim 1, characterized in that: The lifting mechanism (5) includes a fixed frame (51) fixedly installed on the upper end of the main frame (1), a lead screw (53) is rotatably installed on the fixed frame (51), and a lifting motor (52) for driving the lead screw (53) to rotate is fixedly installed on the upper end of the fixed frame (51); a lifting slide (54) is threadedly connected to the lead screw (53), the lifting slide (54) is slidably connected to the fixed frame (51), and the clamping mechanism (7) is installed on the lifting slide (54) through the mounting shaft (55).

3. The universal pressure testing device for multi-specification valves according to claim 1, characterized in that: The lifting slide (54) is provided with a flipping mechanism (6), which is used to drive the clamping mechanism (7) to rotate at different angles to adapt to the corresponding installation angle test of valves with different installation angles; The flipping mechanism (6) includes a flipping cylinder (61) fixedly installed on the lifting slide (54). The output end of the flipping cylinder (61) is fixedly connected to a cylinder connecting plate (62). A drive rack (63) is fixedly connected to the cylinder connecting plate (62). The drive rack (63) is slidably connected to the lifting slide (54). The mounting shaft (55) is rotatably installed on the lifting slide (54), and a transmission rack (64) that meshes with the drive rack (63) is fixedly provided on the mounting shaft (55).

4. The universal pressure testing device for multi-specification valves according to claim 1, characterized in that: A fixed sealing plate (72) is fixedly installed on the upper end of the clamping bracket (71). A second lead screw (75) is rotatably installed on the upper part of the clamping bracket (71). A clamping motor (74) for driving the second lead screw (75) to rotate is fixedly installed on the side wall of the clamping bracket (71). A lead screw slide (76) is threadedly connected to the second lead screw (75). The upper end of the lead screw slide (76) is slidably connected to the lower end of the fixed sealing plate (72). The lower end of the lead screw slide (76) is fixedly connected to the movable sealing plate (77).

5. A universal pressure testing device for multi-specification valves according to claim 1, characterized in that: The support mechanism (9) includes a lifting guide rail (95) mounted on a clamping bracket (71), a lifting base plate (97) slidably mounted on the lifting guide rail (95), and a support base plate (98) for sealing the valve fixedly mounted on the upper end of the lifting base plate (97); a worm gear screw jack (94) is mounted on the clamping bracket (71), and a connecting screw (96) is spirally connected to the worm gear screw jack (94), with the lower end of the connecting screw (96) rotatably connected to the lifting base plate (97).

6. A universal pressure testing device for multi-specification valves according to claim 5, characterized in that: The support mechanism (9) also includes a transverse guide rail (92) fixedly mounted on the clamping bracket (71). The transverse guide rail (92) is perpendicular to the support cylinder (91). A transverse slider (93) is slidably connected to the transverse guide rail (92). The lifting guide rail (95) is fixedly connected to the lower end of the transverse slider (93) and slides against the side wall of the clamping bracket (71). The worm gear screw jack (94) is fixedly mounted on the transverse slider (93). A support cylinder (91) is fixedly mounted on the clamping bracket (71). The output end of the support cylinder (91) is fixedly connected to the transverse slider (93). The extension and retraction of the support cylinder (91) drives the transverse slider (93) to slide laterally along the transverse guide rail (92), thereby adjusting the transverse position of the support base plate (98) and adapting the sealing of the gearbox mounting end face for different valves.

7. The universal pressure testing device for multi-specification valves according to claim 1, characterized in that: The sealing and inflation mechanism (8) includes a mounting base (81) fixedly installed on a fixed sealing plate (72) and a movable sealing plate (77). A guide plate (82) is fixedly provided at one end of the mounting base (81). A plurality of guide grooves (821) arranged in a ring array are provided on the guide plate (821). A top pressure mechanism (83) that extends and retracts radially along the guide plate (82) is installed at the guide groove (821). The radially extending top pressure mechanism (83) is used to support the inner wall of the valve flange inlet and outlet. An inflatable sealing air bladder (84) is provided on the outer periphery of the guide plate (82). The sealing air bladder (84) is used to seal the inner wall of the valve flange inlet and outlet. A through shaft hole is provided on the mounting base (81). A drive air pipe (85) for driving the top pressure mechanism (83) to rotate and for inflating the sealing air bladder (84) and the valve is rotatably installed at the shaft hole.

8. A universal pressure testing device for multi-specification valves according to claim 7, characterized in that: The top-pressing mechanism (83) includes a top-pressing slider (831) slidably disposed on a guide groove (821). An arc-shaped pressure plate (832) is fixedly disposed at one end of the top-pressing slider (831) away from the guide plate (82). A connecting pin (835) is fixedly disposed in the middle of the top-pressing slider (831). A drive support rod (833) is rotatably connected to the connecting pin (835). A drive connecting rod (834) is rotatably connected at one end of the drive support rod (833) away from the connecting pin (835). The end of the drive connecting rod (834) away from the drive support rod (833) is fixedly connected to the drive air pipe (85).

9. A universal pressure testing device for multi-specification valves according to claim 8, characterized in that: A motor bracket (86) is fixedly installed on the mounting base (81), and a drive motor (87) is fixedly installed on the motor bracket (86). The output shaft of the drive motor (87) is connected to the drive air pipe (85) through a transmission belt (88).

10. A universal pressure testing device for multi-specification valves according to claim 9, characterized in that: The drive air pipe (85) includes a drive outer pipe (851) with both ends rotatably mounted at the shaft hole of the mounting base (81). An air guide inner pipe (852) is slidably disposed inside the drive outer pipe (851), and an end sealing plate is provided on the side of the air guide inner pipe (852) near the valve. An outer pipe through hole (853) is provided on the side wall of the drive outer pipe (851) near the valve, and a through hole (853) is provided on the side wall of the air guide inner pipe (852) connecting to the outer pipe. The inner tube has a matching through hole (854), and the end sealing plate of the air guide inner tube (852) is provided with an end air hole (855); the sealing airbag (84) is provided with an airbag sleeve (841) on the side near the valve, the airbag sleeve (841) is rotatably connected to the drive outer tube (851) and fixedly connected to the guide plate (82) by a connecting rod, and the side wall of the airbag sleeve (841) is fixedly provided with a sleeve through hole (842) for inflating the valve. When a pressure test is required on the valve, first place the valve's reducer port on the support base plate (98). Then, adjust the valve's position in the vertical and horizontal directions using the worm gear screw jack (94) and support cylinder (91) so that the valve's flange inlet and outlet are aligned with the fixed sealing plate (72) and movable sealing plate (77) on both sides. Then, use the clamping motor (74) to drive the bracket top plate (73) to rotate and adjust the position of the movable sealing plate (77) so that the movable sealing plate (77) and the fixed sealing plate (77) are aligned. The sealing plates (72) are respectively squeezed and compressed at both ends of the flange inlet and outlet to seal the flange inlet and outlet; then gas is injected into the sealing airbag (84) through the gas guide inner tube (852). At this time, the side of the gas guide inner tube (852) with the end sealing plate is tightly attached to the inner wall of the airbag sleeve (841). The end air hole (855) is blocked by the airbag sleeve (841) and the holes of the inner tube through hole (854) and the outer tube through hole (853) are in a coaxial conductive state. Then the gas passes through the inner tube through hole (854) and the outer tube through hole (853). The outer tube through hole (853) flows into the sealing air bladder (84), causing the sealing air bladder (84) to inflate and seal the inner wall of the valve flange inlet and outlet. After sealing, the drive motor (87) drives the drive outer tube (851) to rotate. The drive outer tube (851) rotates at the same time as the drive connecting rod (834) rotates. The drive support rod (833) drives the top pressure slider (831) to slide outward along the guide groove (821), so that the arc-shaped pressure plate (832) presses against the inner wall of the valve inlet and outlet, thus supporting the valve and ensuring the stability of the connection during the pressure test. Then, according to the different installation angles of the valve, the extension and retraction of the flip cylinder (61) drives the drive rack (63) to slide horizontally. The meshing of the drive rack (63) and the transmission rack (64) drives the clamping mechanism (7) to rotate and adjust the different pressure test angles of the valve, so that the pressure test angle of the valve is the same as the actual installation angle used, thus improving the actual fit of the valve test and the pressure test accuracy. The support base plate (98) not only plays a supporting role during the valve pressure test installation process, but also supports the valve throughout the valve pressure test process. By forming a vertical support with the fixed sealing plate (72) and movable sealing plate (77) on both sides, it ensures the stability of the valve during the pressure test process, effectively reducing the problem of insufficient valve clamping stability caused by the fixed sealing plate (72) and movable sealing plate (77) on both sides due to the weight of the valve. After the valve is installed, the valve is moved downward by the lifting mechanism (5) and immersed in water. Then the air guide tube (852) is pulled outward so that the end sealing plate of the air guide tube (852) is separated from the end of the air bag sleeve (841). The end air hole (855) on the end sealing plate is in a conductive state. As the air guide tube (852) slides outward, the outer tube through hole (853) and the inner tube through hole (854) are misaligned and separated. The outer tube through hole (853) and the inner tube through hole (854) are both in a disconnected state. At this time, the air source flows to the air bag sleeve (841) through the end air hole (855) and then flows into the valve through the sleeve through hole (842) to realize the inflation of the valve and thus complete the pressure test of the valve.

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