A valve hydrostatic tester fastening device

Abstract

This invention discloses a fastening device for a valve hydrostatic testing machine, relating to the technical field of valve testing equipment. It includes a main hydraulic device and a water tank. An auxiliary hydraulic device is fixedly connected to the telescopic end of the main hydraulic device, and a frame is fixedly connected to the bottom of the auxiliary hydraulic device. A quick-change assembly is installed on the frame. The quick-change assembly in this device, through its hanging ring, locking hook, and concave-convex structure design, allows for rapid replacement of the test plate. The mechanical locking between the hanging ring and the locking hook, along with the concave-convex insertion structure, forms a double-stable connection, capable of withstanding the reaction force of the high-pressure hydrostatic test. This effectively prevents the test plate from loosening, shifting, or falling off during the test, solving the problem of cumbersome operation caused by manually aligning and tightening bolts one by one in existing technologies. Thus, this device improves the testing safety and data accuracy of valve testing fastening devices.

Description

Technical Field

[0001] This invention relates to the field of valve testing equipment technology, and more specifically, to a fastening device for a valve hydrostatic testing machine. Background Technology

[0002] Mechanical valves in new energy vehicles are core components in fluid transport systems used to control the flow of media and regulate pressure and flow. The hydrostatic strength test is a mandatory test item that must be completed before the valve leaves the factory. By injecting high-pressure media into the valve and using fastening devices, the structural strength and sealing reliability of pressure-bearing components such as valve body and valve cover are tested. During the test, a workbench and a test pressure blind flange that matches the valve flange specifications are required to seal both ends of the valve to form a closed pressure-bearing cavity before the pressure test is carried out. In existing technologies, test pressure blind flanges are usually fixed by bolt connections. When it is necessary to disassemble the test pressure blind flange, the operator must remove all the bolts between the old blind flange and the extension end of the hydraulic cylinder one by one. After removing the old blind flange, the new blind flange is moved to the bottom of the hydraulic cylinder. The bolt holes at the end of the blind flange and the hydraulic cylinder are manually aligned, and multiple sets of connecting bolts are inserted. Then, tools are used to tighten them evenly one by one in a diagonal order. This method is cumbersome and requires repeated bolt alignment. Uneven bolt tightening will cause uneven stress on the blind flange, which may lead to medium leakage during the test. This not only reduces the accuracy of the test data, but may also cause safety accidents due to high-pressure medium injection. Furthermore, existing technologies typically employ an external pressure end-face sealing structure. This involves using a hydraulic cylinder to drive a test blind flange to apply axial pressure to the valve flange end face, causing the rubber sealing ring placed between the pressure plate and the flange to compress and deform, thereby sealing the valve port and forming a sealing cavity. To prevent the high-pressure medium from pushing the blind flange open and causing seal failure, operators apply axial pressure far exceeding the test pressure required. For valve bodies with low rigidity, such as thin-walled aluminum alloys, excessive axial pressure will directly act on the connection between the valve body straight pipe and the flange, easily causing crushing, cracking, and permanent deformation at the connection, leading to the scrapping of the valve product. Furthermore, the existing testing machine fastening device does not take any support measures for the asymmetrical valve body with "collinear ports but offset center of gravity". During the test, the valve body is fixed only by the axial clamping force of the test pressure blind plate. In this way, during the axial clamping process, the offset center of gravity will generate a torsional moment, which will force the valve body to deflect, thereby causing the sealing surface to be misaligned. This results in deviations in the measured pressure and sealing data, which cannot truly reflect the product performance.

[0003] To solve the above problems, the inventors proposed a fastening device for a valve hydrostatic testing machine. Summary of the Invention

[0004] To solve the above-mentioned technical problems, a fastening device for a valve hydrostatic testing machine is provided. This technical solution solves the problems mentioned in the background art. To achieve the above objectives, the present invention can be implemented using the following technical solutions: This invention provides a fastening device for a valve hydrostatic testing machine, including a main hydraulic device and a water tank. The telescopic end of the main hydraulic device is fixedly connected to a secondary hydraulic device, and a frame is fixedly connected to the bottom of the secondary hydraulic device. A worktable is fixedly connected to the frame. The frame is equipped with a quick-change assembly, which includes a fixed connector and a test plate. The fixed connector is fixedly connected to the telescopic end of the auxiliary hydraulic device. Three limit blocks and three rotating shaft seats are fixedly connected circumferentially at equal intervals on the fixed connector. Each limit block is rotatably connected to a handle. Each handle is rotatably connected to a base on its outer wall. Each base has two vertical grooves symmetrically formed inside. A T-shaped rod is slidably connected in every two vertical grooves. A spring is fixedly connected between each T-shaped rod and the adjacent base. A hanging ring is fixedly connected to the end of each T-shaped rod. Each fixed connector has a combined slot, which consists of a horizontal slot and a vertical slot, and the horizontal slot and the vertical slot are interconnected.

[0005] Preferably, the quick-change assembly includes a water storage tank, a bidirectional water pump is installed inside the water storage tank, a water inlet pipe is connected inside the water storage tank, and three locking hooks are fixedly connected in a ring at equal intervals on the surface of the test pressure plate.

[0006] Preferably, the water inlet pipe is inserted into the horizontal slot in the combined slot, each of the locking hooks is adapted to the hanging ring, and the outer ring surface of the fixed joint is hinged with three limiting rods at equal intervals.

[0007] Preferably, both the workbench and the test plate are provided with sealing components. The sealing components include a connecting pipe, an annular air bladder, and a connecting pipe. There are two sets of the connecting pipe, annular air bladder, and connecting pipe. One set of the connecting pipe, annular air bladder, and connecting pipe is fixedly connected to the workbench, and the other set of the connecting pipe, annular air bladder, and connecting pipe is fixedly connected to the test plate. Each end of the connecting pipe is provided with an interface.

[0008] Preferably, the sealing assembly further includes an air tank, which is equipped with a bidirectional air pump and a pressure sensor. The air tank is connected to two telescopic hoses, each of which is plugged into the interface of a nearby connecting pipe.

[0009] Preferably, each of the connecting pipes is fixedly connected to a nearby annular airbag, one of the annular airbags being hollow and adapted to the vertical slot in the combined slot, and the other annular airbag being solid.

[0010] Preferably, the frame is provided with a support assembly, which includes a bracket fixedly connected to the frame. Two brackets are symmetrically arranged. One bracket is fixedly connected to the frame with a short guide rod, and the other bracket is rotatably connected to the frame with a short threaded rod. A knob is rotatably connected to the surface of one of the brackets. A horizontal plate is threadedly connected to the short threaded rod. Two long threaded rods and two knobs are symmetrically rotatably connected to the horizontal plate. A long guide rod is fixedly connected inside the horizontal plate. Two movable frames are symmetrically slidably connected to the outer ring of the long guide rod. A main airbag plate is fixedly connected to each movable frame. Two auxiliary airbag plates are symmetrically rotatably connected to the outer wall of each main airbag plate.

[0011] Preferably, the knob is fixedly connected to the short threaded rod, and the cross plate is slidably connected to the short guide rod.

[0012] Preferably, the threads of the two long threaded rods are opposite in direction, each of the two knobs is fixedly connected to the adjacent long threaded rod, each of the movable frames is threadedly connected to the adjacent long threaded rod, and the auxiliary airbag plate is interference-fitted with the main airbag plate.

[0013] As described above, the advantages of the present invention are: The quick-change assembly in this device, through the design of the hanging ring, locking hook, and concave-convex structure, allows for rapid replacement of the test plate. The mechanical locking between the hanging ring and the locking hook, along with the concave-convex insertion structure, forms a double-stable connection capable of withstanding the reaction force of the high-pressure hydrostatic test. This effectively prevents the test plate from loosening, shifting, or falling off during the test. It solves the problem of the cumbersome operation caused by manually aligning and inserting bolts and tightening them one by one in the existing technology. As a result, this device improves the test safety and data accuracy of the valve testing and fastening device.

[0014] The support components in this device provide multi-point symmetrical flexible support through a centrally movable main airbag plate and an adjustable-angle auxiliary airbag plate. This effectively suppresses the valve body's deflection tendency and solves the problem in the prior art where no support measures are taken for asymmetrical valve bodies with "collinear ports but offset center of gravity". During axial compression, the offset center of gravity generates a torsional torque, forcing the valve body to deflect and causing misalignment of the sealing surface. As a result, this device improves the accuracy and repeatability of valve testing data.

[0015] The sealing assembly in this device, through a spindle-type internal expansion sealing structure formed by the connecting pipe and the annular air bladder, provides radial expansion force from inside the valve's straight pipe, causing the air bladder to fit tightly against the inner wall of the straight pipe. During hydrostatic testing, the high pressure inside the valve body acts on the air bladder, and friction can be generated between the air bladder and the inner wall of the straight pipe to resist part of the axial thrust. This solves the problem of all axial thrust being borne by the external test pressure blind plate, thereby reducing the clamping force required for end face sealing and reducing the risk of crushing at the straight pipe connection in low-rigidity valve bodies such as thin-walled aluminum alloys. In this way, the device improves the sealing reliability of the valve testing and fastening device. Attached Figure Description

[0016] Figure 1 This is a front perspective view of the overall structure of the present invention; Figure 2 This is a three-dimensional schematic diagram of the gas storage tank and related components of the telescopic hose shown in the present invention; Figure 3 This is a three-dimensional schematic diagram of the fixed connector and handle-related components shown in the present invention; Figure 4 This is a three-dimensional schematic diagram of the base and T-shaped rod components shown in this invention; Figure 5 This is a three-dimensional cross-sectional view of the fixed joint shown in the present invention; Figure 6 This is an exploded three-dimensional schematic diagram of the fixed joint and test plate shown in this invention; Figure 7 This is a three-dimensional schematic diagram of the connecting pipe and telescopic flexible hose components shown in this invention; Figure 8 This is a three-dimensional schematic diagram of the workbench and related components of the telescopic hose shown in the present invention. Figure 9 This is a three-dimensional schematic diagram of the bracket, knob, and related components shown in the present invention; Figure 10 This is a three-dimensional schematic diagram of the short guide rod and short threaded rod components shown in the present invention. Figure 11 This is a three-dimensional schematic diagram of the horizontal plate and long guide rod components shown in this invention; Figure 12 This is a three-dimensional schematic diagram of the main airbag plate and the auxiliary airbag plate components shown in this invention.

[0017] The reference numerals in the accompanying drawings of this invention are as follows: 1. Main hydraulic unit; 2. Water tank; 3. Auxiliary hydraulic unit; 41. Frame; 42. Workbench; Quick-change components: 51. Fixed connector; 52. Limiting block; 53. Rotary shaft seat; 54. Handle; 55. Base; 56. T-shaped rod; 57. Spring; 58. Hanging ring; 5801. Limiting rod; 59. Combination slot; 510. Water storage tank; 511. Water inlet pipe; 512. Test pressure plate; 513. Locking hook; Sealing components: 61. Connecting pipe; 62. Annular airbag body; 63. Connecting pipe; 64. Air tank; 65. Telescopic hose; Support components: 71. Bracket; 72. Short guide rod; 73. Short threaded rod; 74. Knob 1; 75. Horizontal plate; 76. Long threaded rod; 77. Knob 2; 78. Long guide rod; 79. Moving frame; 710. Main airbag plate; 711. Secondary airbag plate. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] The embodiments provided by the present invention will be described in detail below: A fastening device for a valve hydrostatic testing machine, such as Figure 1 As shown, it includes a main hydraulic device 1 and a water tank 2. The water tank 2 is filled with water for hydrostatic testing. The telescopic end of the main hydraulic device 1 is fixedly connected to an auxiliary hydraulic device 3. The bottom of the auxiliary hydraulic device 3 is fixedly connected to a frame 41. The auxiliary hydraulic device 3 includes a fixed end and a telescopic end. That is, the frame 41 is fixed to the outer surface of the fixed end of the auxiliary hydraulic device 3. A worktable 42 is fixedly connected to the frame 41. The main hydraulic device 1, water tank 2, auxiliary hydraulic device 3, frame 41 and worktable 42 are all existing technologies and will not be described in detail here. like Figures 2 to 6As shown, a quick-change assembly is provided on the frame 41. The quick-change assembly includes a fixed joint 51 and a test plate 512. The fixed joint 51 is fixedly connected to the telescopic end of the auxiliary hydraulic device 3. Three limiting blocks 52 and three rotating shaft seats 53 are fixedly connected at equal intervals on the outer ring surface of the fixed joint 51. Each rotating shaft seat 53 is located directly above the adjacent limiting block 52. A handle 54 is rotatably connected to each limiting block 52. A base 55 is rotatably connected to the outer wall of each handle 54. Each rotating shaft seat 53 abuts against the outer wall of the adjacent base 55. Each base 55 contains... Two vertical slots are symmetrically provided, and a T-shaped rod 56 is slidably connected in each pair of vertical slots. Each T-shaped rod 56 is located below the handle 54. A spring 57 is fixedly connected between each T-shaped rod 56 and the adjacent base 55. A part of each T-shaped rod 56 extends out of the adjacent base 55. A hanging ring 58 is fixedly connected to the end of each T-shaped rod 56 that extends out of the base 55. A combination slot 59 is provided on the outer ring surface and bottom surface of each fixed joint 51. The combination slot 59 consists of a horizontal slot and a vertical slot, and the horizontal slot and the vertical slot are interconnected.

[0020] Furthermore, such as Figure 2 and Figure 3 As shown, the quick-change assembly includes a water storage tank 510, a bidirectional water pump is installed inside the water storage tank 510, and the bidirectional water pump inside the water storage tank 510 is connected to a water inlet pipe 511. The bidirectional water pump is used to transport water in the water storage tank 510 through the water inlet pipe 511. Three locking hooks 513 are fixedly connected in an annular shape at equal intervals on the upper surface of the test pressure plate 512.

[0021] Furthermore, such as Figure 3 , Figure 5 and Figure 6 As shown, a connector is installed at the end of the water inlet pipe 511 away from the water storage tank 510. The connector is threaded to the horizontal slot in the combination slot 59. Each locking hook 513 is adapted to the hanging ring 58. Each locking hook 513 is tightened by the adjacent hanging ring 58. Therefore, the T-shaped rod 56 is stretched, thereby compressing each spring 57. Three limiting rods 5801 are equidistantly hinged on the outer ring surface of the fixed joint 51. The limiting rods 5801 are used to limit the base 55 to prevent the base 55 from loosening. Each limiting rod 5801 abuts against the outer wall of the adjacent base 55.

[0022] Furthermore, such as Figures 6 to 8As shown, both the workbench 42 and the test pressure plate 512 are equipped with sealing components. The sealing components include a connecting pipe 61, an annular airbag 62, and a connecting pipe 63. There are two sets of connecting pipes 61, annular airbags 62, and connecting pipes 63. One set of connecting pipes 61, annular airbags 62, and connecting pipes 63 is fixedly connected to the workbench 42, and the other set of connecting pipes 61, annular airbags 62, and connecting pipes 63 is fixedly connected to the test pressure plate 512. Each connecting pipe 63 has an interface at the end away from the nearest annular airbag 62.

[0023] Furthermore, such as Figure 2 As shown, the sealing assembly also includes an air tank 64, which contains a bidirectional air pump and a pressure sensor. The bidirectional air pump is used to supply and evacuate air into the annular airbag 62, and the pressure sensor is used to detect the pressure of the gas inside the annular airbag 62. The bidirectional air pump in the air tank 64 is connected to two telescopic hoses 65, and each telescopic hose 65 is plugged into the interface of a nearby connecting pipe 63. In this way, an air passage is formed between the annular airbag 62 and the air tank 64 through the connecting pipe 63 and the telescopic hoses 65.

[0024] Furthermore, such as Figure 6 and Figure 9 As shown, each connecting pipe 61 is fixedly connected to the adjacent annular airbag 62. The annular airbag 62 located in the test pressure plate 512 is hollow and is adapted to the vertical slot in the combination slot 59. The annular airbag 62 located on the worktable 42 is solid.

[0025] Furthermore, such as Figures 8 to 12 As shown, a support assembly is provided on the frame 41. The support assembly includes a bracket 71 fixedly connected to the frame 41. Two brackets 71 are symmetrically arranged. One bracket 71 is fixedly connected to the frame 41 with a short guide rod 72. The other bracket 71 is rotatably connected to the frame 41 with a short threaded rod 73. The short guide rod 72 and the short threaded rod 73 are arranged parallel to each other. A knob 74 is rotatably connected to the upper surface of the bracket 71 near the short threaded rod 73. A horizontal plate 75 is threadedly connected to the short threaded rod 73. Two long threaded rods 76 and two knobs 77 are symmetrically rotatably connected to the horizontal plate 75. A long guide rod 78 is fixedly connected inside the horizontal plate 75. The two long threaded rods 76 are arranged parallel to the long guide rod 78. Two movable frames 79 are symmetrically slidably connected to the outer ring of the long guide rod 78. A main airbag plate 710 is fixedly connected to each movable frame 79. Two auxiliary airbag plates 711 are symmetrically rotatably connected to the outer wall of each main airbag plate 710.

[0026] Furthermore, such as Figure 10 and Figure 11As shown, knob 74 is fixedly connected to short threaded rod 73, and horizontal plate 75 is slidably connected to short guide rod 72. By rotating knob 74, short threaded rod 73 can drive horizontal plate 75 to move vertically.

[0027] Furthermore, such as Figure 12 As shown, the threads of the two long threaded rods 76 are opposite in direction. Each knob 77 is fixedly connected to the adjacent long threaded rod 76. One end of each movable frame 79 is threadedly connected to the adjacent long threaded rod 76. By rotating the knob 77, the long threaded rod 76 can drive the movable frame 79 to move laterally. The auxiliary airbag plate 711 and the main airbag plate 710 are tightly rotatably connected by a mounting shaft. When no force is applied, the auxiliary airbag plate 711 will not rotate arbitrarily. The angle between the main airbag plate 710 and the auxiliary airbag plate 711 can be adjusted by rotating the auxiliary airbag plate 711.

[0028] During work: This device can improve the internal sealing of the valve and support the valve body during the testing process. The detailed steps are as follows: When it is necessary to test the valve of a new energy vehicle, first align the outlet pipe of the valve to be tested with the connecting pipe 61 and the annular airbag 62 on the workbench 42, and place the valve on the surface of the workbench 42 so that the connecting pipe 61 and the annular airbag 62 on the workbench 42 are inserted into the interior of the valve outlet pipe until the flange end of the valve outlet pipe comes into contact with the end of the workbench 42. Then, depending on the size of the valve, turn knob 74 clockwise. Knob 74 drives the short threaded rod 73 to rotate clockwise as well, causing the horizontal plate 75 to move vertically upward along the short guide rod 72 until the main airbag plate 710 is located in the middle of the valve body. Then, stop turning knob 74. Next, turn both knobs 77 clockwise. Knob 77 drives the long threaded rod 76 to rotate clockwise as well, causing the two moving frames 79 to move closer to each other along the long guide rod 78. This further brings the two main airbag plates 710 closer to each other. According to the shape of the valve body's outer shell, the operator can rotate the auxiliary airbag plates 711 on both sides of the main airbag plate 710 to adjust the angle between the main airbag plate 710 and the auxiliary airbag plate 711. This further makes both the auxiliary airbag plate 711 and the main airbag plate 710 come into contact with the valve body's outer shell wall, thus providing support for the valve body.

[0029] Then, the controller extends the telescopic end of the auxiliary hydraulic device 3, causing the fixed joint 51 and the test plate 512 to move vertically downward. When the bottom surface of the test plate 512 contacts the end of the valve body inlet pipe flange, the controller stops the extension of the telescopic end of the auxiliary hydraulic device 3. Then, the bidirectional air pump in the gas storage tank 64 is started by the controller. The bidirectional air pump delivers the gas in the gas storage tank 64 to the interior of the two annular air bladders 62 through two telescopic hoses 65. As the gas is continuously input, the annular air bladders 62 gradually expand. When the pressure sensor in the gas storage tank 64 detects that the air pressure in the annular air bladders 62 has reached the set value, that is, when the outer ring surface of the annular air bladders 62 is in close contact with the inner ring surface of the inlet pipe and the outlet pipe, the bidirectional air pump stops working.

[0030] After the above steps are completed, the bidirectional water pump in the water storage tank 510 is started by the controller. The water in the water storage tank 510 is pumped through the bidirectional water pump, through the inlet pipe 511, the combined slot 59 and the connecting pipe 61 on the test plate 512 to the inside of the valve. When the water pressure inside the valve reaches the set value, the bidirectional water pump stops working. Then, the controller causes the telescopic end of the main hydraulic device 1 to extend, so that the valve to be tested placed on the frame 41 moves into the inside of the water tank 2. The frame 41 body will not enter the water tank 2, so as to carry out the hydrostatic test. During hydrostatic testing, in existing technologies, the water pressure inside the valve acts on the end face of the test pressure blind plate, generating an axial thrust. To prevent the axial thrust from pushing the test pressure blind plate open, the test pressure blind plate needs to be subjected to an axial clamping force far exceeding the test pressure. Therefore, in existing technologies, the axial thrust generated by the water pressure is entirely borne by the test pressure blind plate. In this device, the air bladder 62 in the sealing structure provides radial expansion force from inside the valve straight pipe. During hydrostatic testing, the water pressure acts directly on the end face of the air bladder 62, pressing the air bladder more tightly against the inner wall of the valve straight pipe (equivalent to adding an extra radial expansion force). When the axial thrust generated by the water pressure attempts to push away the test pressure plate 512, the axial friction between the air bladder 62 and the inner wall of the straight pipe will resist part of the axial thrust. In this way, it is not necessary to apply an axial clamping force far exceeding the test pressure, avoiding the problem of local stress concentration caused by the axial thrust acting at the connection between the valve straight pipe and the valve body, which could lead to deformation or cracking at the connection.

[0031] In the above process, the support components in this device, through the centrally movable main airbag plate 710 and the adjustable-angle auxiliary airbag plate 711, provide multi-point symmetrical flexible support, effectively suppressing the valve body deflection tendency. This solves the problem in the prior art where no support measures are taken for asymmetrical valve bodies with "collinear ports but offset center of gravity". During axial pressing, the offset center of gravity generates a torsional torque, forcing the valve body to deflect and causing misalignment of the sealing surface. In this way, this device improves the accuracy and repeatability of valve test data.

[0032] In the above process, the sealing component in this device, through the spindle-type internal expansion sealing structure formed by the connecting pipe 61 and the annular air bladder 62, provides radial expansion force from the inside of the valve straight pipe, so that the air bladder is tightly attached to the inner wall of the straight pipe. During the hydrostatic test, the high pressure inside the valve body acts on the air bladder, and friction can be formed between the air bladder and the inner wall of the straight pipe to resist part of the axial thrust. This solves the problem that all the axial thrust is borne by the external test pressure blind plate, thereby reducing the clamping force required for the end face seal and reducing the risk of crushing at the straight pipe connection in low-rigidity valve bodies such as thin-walled aluminum alloy. In this way, this device improves the sealing reliability of the valve testing and fastening device.

[0033] After the test is completed, the controller retracts the telescopic end of the main hydraulic device 1, causing the frame 41 to move vertically upwards and return to its initial position. Then, the controller starts the bidirectional air pump in the air tank 64, drawing the gas from the two annular airbags 62 back into the air tank 64. During this process, the annular airbags 62 gradually shrink. When the annular airbags 62 shrink back to their initial size, the controller starts the bidirectional water pump in the water tank 510, drawing the water from the valve back into the water tank 510. The controller also retracts the telescopic end of the auxiliary hydraulic device 3, causing the test plate 512 to move vertically upwards and return to its initial position. Then, the knob 77 is rotated in the opposite direction to adjust the angle between the auxiliary airbag plate 711 and the main airbag plate 710, causing the main airbag plate 710 and the auxiliary airbag plate 711 to move away from each other and return to their initial positions. Then, the knob 74 is rotated in the opposite direction to move the horizontal plate 75 vertically downwards and return to its initial position. Finally, the valve that has been tested is removed for the next test.

[0034] This device allows for quick replacement of the test plate 512. The detailed steps are as follows: When the test plate 512 needs to be replaced, first remove the inlet pipe 511 from the horizontal slot in the combination slot 59, then rotate the limit rod 5801 upwards by 90 degrees so that the limit rod 5801 leaves the base 55 and is no longer in contact with the base 55. Then pull the handle 54 outwards so that the handle 54 rotates around the limit block 52 in a direction away from the rotating shaft seat 53. During the rotation of the handle 54, the base 55, T-shaped rod 56, spring 57 and hanging ring 58 all rotate around the locking hook 513 in a direction away from the rotating shaft seat 53. At the same time, the spring 57 gradually rebounds and returns to its original position, so that the T-shaped rod 56 rotates along the base 513 in a direction away from the rotating shaft seat 53. The vertical groove inside 5 moves towards the side closer to the handle 54, and drives the hanging ring 58 to move together. At the same time, as the spring 57 gradually rebounds and returns to its original position, the preload between the hanging ring 58 and the locking hook 513 gradually decreases. As the T-shaped rod 56 and the hanging ring 58 continue to move, when the upper end surface of the hanging ring 58 contacts the bottom surface of the base 55, the base 55, T-shaped rod 56, spring 57 and hanging ring 58 no longer rotate around the locking hook 513. Instead, as the handle 54 rotates, they are pushed by the handle 54 and move downward along the vertical part of the locking hook 513 until the hook part of the locking hook 513 no longer closely contacts the bottom surface of the inner wall of the hanging ring 58. When the inner wall of the hanging ring 58 coincides with the hook portion of the locking hook 513, pull the base 55 outward, so that the base 55 and the hanging ring 58 rotate around the handle 54 in a direction away from the locking hook 513, thereby causing the hanging ring 58 to disengage from the locking hook 513. At this time, the unlocking between one of the hanging rings 58 and the locking hook 513 is completed. Repeat the above steps to unlock the other two hanging rings 58 as well. Then remove the test plate 512, thus completing the disassembly of the test plate 512.

[0035] When the test plate 512 needs to be installed, first align the connecting pipe 61 on the test plate 512 and insert it into the vertical slot in the combination slot 59, ensuring that each locking hook 513 is directly below the adjacent hanging ring 58. Then rotate the base 55 so that it rotates around the handle 54 towards the side closer to the locking hook 513 until the hook portion of the locking hook 513 is fitted into the hanging ring 58. Then push the handle 54 so that it rotates around the limit block 52 towards the side closer to the rotating shaft seat 53. The base 55 moves together with the handle 54, and springs back during this process. Spring 57 is gradually compressed, and the tension generated by spring 57 gradually increases until the rotating shaft seat 53 abuts against the base 55. Then, the limiting rod 5801 is rotated back to the initial position so that it contacts the outer wall of the base 55. At this time, the locking between one of the hanging rings 58 and the locking hook 513 is completed. Repeat the above steps to lock the other two hanging rings 58 and the locking hooks 513. After all three hanging rings 58 and the locking hooks 513 are locked, the water inlet pipe 511 is inserted into the horizontal slot in the combination slot 59. In this way, the installation of the pressure test plate 512 is completed.

[0036] In the above process, the quick-change component in this device, through the design of the hanging ring 58, the locking hook 513, and the concave-convex structure, can quickly replace the test plate 512. The mechanical locking method between the hanging ring 58 and the locking hook 513 and the concave-convex plug-in structure form a double stable connection, which can withstand the reaction force of the high-pressure hydrostatic test and effectively prevent the test plate 512 from loosening, displacing or falling off during the test. This solves the problem of the existing technology that requires manual alignment and insertion of bolts and tightening of bolts one by one, which leads to cumbersome operation. In this way, this device improves the test safety and data accuracy of the valve testing fastening device.

[0037] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A valve hydrostatic tester fastening device comprising a main hydraulic device (1) and a water tank (2), characterized in that, The telescopic end of the main hydraulic device (1) is fixedly connected to the auxiliary hydraulic device (3), the bottom of the auxiliary hydraulic device (3) is fixedly connected to the frame (41), and the workbench (42) is fixedly connected to the frame (41). The frame (41) is provided with a quick-change assembly, which includes a fixed joint (51) and a test plate (512). The fixed joint (51) is fixedly connected to the telescopic end of the auxiliary hydraulic device (3). Three limiting blocks (52) and three rotating shaft seats (53) are fixedly connected in a ring at equal intervals on the fixed joint (51). Each limiting block (52) is rotatably connected to a handle (54). Each handle (54) is rotatably connected to a base (55) on its outer wall. Two vertical slots are symmetrically opened in each base (55), and a T-shaped rod (56) is slidably connected in each pair of vertical slots. A spring (57) is fixedly connected between each T-shaped rod (56) and the adjacent base (55). A hanging ring (58) is fixedly connected to the end of each T-shaped rod (56). A combination slot (59) is opened on each fixed joint (51). The combination slot (59) is composed of a horizontal slot and a vertical slot, and the horizontal slot and the vertical slot are interconnected.

2. The fastening device for a valve hydrostatic testing machine according to claim 1, characterized in that, The quick-change assembly includes a water storage tank (510), a bidirectional water pump is installed inside the water storage tank (510), a water inlet pipe (511) is connected inside the water storage tank (510), and three locking hooks (513) are fixedly connected in an annular shape at equal intervals on the surface of the test plate (512).

3. The fastening device for a valve hydrostatic testing machine according to claim 1, characterized in that, The water inlet pipe (511) is inserted into the horizontal slot in the combination slot (59), each of the locking hooks (513) is adapted to the hanging ring (58), and the outer ring surface of the fixed joint (51) is hinged with three limiting rods (5801) at equal intervals.

4. The fastening device for a valve hydrostatic testing machine according to claim 1, characterized in that, Both the workbench (42) and the test plate (512) are equipped with sealing components. The sealing components include a connecting pipe (61), an annular airbag (62), and a connecting pipe (63). There are two sets of the connecting pipe (61), the annular airbag (62), and the connecting pipe (63). One set of the connecting pipe (61), the annular airbag (62), and the connecting pipe (63) is fixedly connected to the workbench (42), and the other set of the connecting pipe (61), the annular airbag (62), and the connecting pipe (63) is fixedly connected to the test plate (512). Each connecting pipe (63) has an interface at its end.

5. The fastening device for a valve hydrostatic testing machine according to claim 4, characterized in that, The sealing assembly also includes an air tank (64), which is equipped with a bidirectional air pump and a pressure sensor. The air tank (64) is connected to two telescopic hoses (65), each of which is plugged into the interface of a nearby connecting pipe (63).

6. The valve hydrostatic testing machine fastening device according to claim 4, characterized in that, Each of the connecting pipes (61) is fixedly connected to the adjacent annular airbag (62), one of the annular airbags (62) being hollow and adapted to the vertical slot in the combination slot (59), and the other annular airbag (62) being solid.

7. The fastening device for a valve hydrostatic testing machine according to claim 1, characterized in that, The frame (41) is provided with a support assembly, which includes a bracket (71) fixedly connected to the frame (41). Two brackets (71) are symmetrically arranged. One bracket (71) is fixedly connected to the frame (41) with a short guide rod (72), and the other bracket (71) is rotatably connected to the frame (41) with a short threaded rod (73). A knob (74) is rotatably connected to the surface of one of the brackets (71). A horizontal plate (75) is threadedly connected to the short threaded rod (73). Two long threaded rods (76) and two knobs (77) are symmetrically rotatably connected to the horizontal plate (75). A long guide rod (78) is fixedly connected inside the horizontal plate (75). Two movable frames (79) are symmetrically slidably connected to the outer ring of the long guide rod (78). A main airbag plate (710) is fixedly connected to each movable frame (79). Two auxiliary airbag plates (711) are symmetrically rotatably connected to the outer wall of each main airbag plate (710).

8. The fastening device for a valve hydrostatic testing machine according to claim 7, characterized in that, The knob (74) is fixedly connected to the short threaded rod (73), and the horizontal plate (75) is slidably connected to the short guide rod (72).

9. A valve hydrostatic testing machine fastening device according to claim 7, characterized in that, The two long threaded rods (76) have opposite thread directions, each of the two knobs (77) is fixedly connected to the adjacent long threaded rod (76), each of the movable frames (79) is threadedly connected to the adjacent long threaded rod (76), and the auxiliary airbag plate (711) is interference-fitted with the main airbag plate (710).

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