An ultrahigh-pressure pipe detection seal protection dismounting integrated device and detection method

Abstract

The application relates to an ultrahigh-pressure pipe detection sealing protection dismounting integrated device and a detection method, and belongs to the technical field of high-pressure pipe detection. The device comprises a bottom plate table, a front baffle and a rear baffle, characterized in that: a sliding rail is arranged on the bottom plate table, a first sliding block and a second sliding block are arranged on the sliding rail, the front baffle and the rear baffle are oppositely arranged on the sliding rail, the front baffle is fixedly connected with the bottom plate table, the rear baffle is fixed on the first sliding block, a variable pitch screw rod is arranged between the front baffle and the rear baffle, an extension rod mechanism is connected with a small-pitch threaded rod segment of the screw rod, the extension rod mechanism is composed of a nut and a top rod, front and rear plugs are arranged on opposite surfaces of the front and rear baffles, sealing assemblies are arranged on the front and rear plugs, and a through hole is arranged on the front plug. The device has the advantages that the installation, clamping, sealing, testing and dismounting actions in the ultrahigh-pressure pipe detection process are cooperatively completed, time and labor are saved, the safety and the detection efficiency are improved.

Description

Technical Field

[0001] This invention relates to an integrated device and method for testing, sealing, protection, disassembly, and assembly of ultra-high pressure pipe fittings. It is applicable to scenarios such as sealing testing and self-reinforcing of ultra-high pressure pipe fittings and can be widely used in fields such as military and petrochemical industries where there is a rigid demand for testing ultra-high pressure pipe fittings. It belongs to the field of high pressure pipe fitting testing technology. Background Technology

[0002] In the production and testing of ultra-high pressure pipe fittings in military, petrochemical, and other fields, sealing pressure resistance tests and self-reinforcing tests are required to ensure the safety and reliability of the pipe fittings under ultra-high pressure conditions. Test pressures can reach hundreds of megapascals, necessitating the design of suitable sealing and protective fixtures for the test workpieces. Current traditional fixtures for this type of testing have several drawbacks: First, installation and disassembly are entirely manual, involving cumbersome procedures and complex processes; second, the protective components of ultra-high pressure fixtures are heavy, resulting in extremely high labor intensity for operators, and safety accidents are easily caused by component slippage or pressure runaway during operation; third, traditional fixtures require additional auxiliary tools to handle emergencies such as workpiece damage or jamming, leading to low emergency response efficiency; fourth, the assembly of traditional soft sealing rings is extremely difficult for test pieces with small-angle end faces, often requiring significant time to adjust the assembly posture, severely impacting testing efficiency; fifth, traditional fixtures cannot achieve multi-action coordinated completion, resulting in long testing cycles and difficulty in meeting the testing needs of large batches of pipe fittings.

[0003] Therefore, developing an ultra-high pressure sealing and protection disassembly and assembly device that is simple in structure, easy to operate, low in labor intensity, high in safety, adaptable to various workpiece types, and capable of multi-action collaborative completion has become the key to solving the current technical pain points. Summary of the Invention

[0004] The purpose of this invention is to address the technical problems of existing ultra-high pressure pipe fitting testing fixtures, such as cumbersome manual installation and disassembly, high labor intensity, high safety risks, inconvenience in handling emergencies, difficulty in soft sealing assembly of small-angle end face workpieces, low testing efficiency, and inability to adapt to large-scale testing needs. This invention provides an integrated device and method for the testing, sealing, protection, disassembly, and assembly of ultra-high pressure pipe fittings, enabling the coordinated completion of multiple actions such as installation, clamping, sealing, testing, and disassembly during the ultra-high pressure pipe fitting testing process, thereby saving time and effort, improving safety, and increasing testing efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An integrated device for testing, sealing, protection, and disassembly of ultra-high pressure pipe fittings includes a base plate, a front baffle, and a rear baffle. The device is characterized by: a slide rail on the base plate, with a first slider and a second slider slidably fitted on the slide rail; the front baffle and rear baffle are positioned opposite each other on the slide rail; the front baffle is fixedly connected to the base plate by a base; the rear baffle is fixed to the first slider; bolt holes are symmetrically arranged on the left and right sides of the rear baffle; and corresponding circular holes are formed on the front baffle. The screw that mates with the bolt holes is a variable pitch screw, with the front section being a small-pitch threaded rod and the rear section... It is a large-pitch threaded rod, which extends through the bolt hole of the rear baffle. The large-pitch threaded rod section mates with the bolt hole. The front end of the rod is connected to the round hole of the front baffle by a bearing. On the small-pitch threaded rod section, a telescopic rod mechanism is connected by a threaded adapter. The telescopic rod mechanism consists of a nut and a push rod fixed on the inner end face of the nut that can adjust the length. A front plug and a rear plug are respectively provided on the opposite surfaces of the front baffle and the rear baffle. Sealing components are provided at the opposite ends of the front plug and the rear plug. A through hole for connecting ultra-high voltage equipment is provided in the middle of the front plug.

[0006] The screw has two threads, and the thread pitch that mates with the rear baffle is greater than the thread pitch that mates with the nut of the telescopic rod mechanism, thereby achieving differential motion between the rear baffle and the telescopic rod mechanism.

[0007] Both the front and rear plugs are provided with stepped grooves and threads at their ends for installing sealing components.

[0008] The sealing assembly consists of a metal hard seal and a plastic soft seal.

[0009] The sealing surface of the metal hard seal is a beveled structure with an angle of 40° to 60°, ensuring sealing reliability under ultra-high pressure conditions.

[0010] The plastic soft seal has a constricted opening structure with a constriction taper of 10° to 20°. It can be directly assembled by extrusion without complicated adjustment procedures, and is especially suitable for test workpieces with small-angle end faces.

[0011] The sealing assembly is installed on the stepped grooves at the ends of the front and rear plugs and is threadedly connected to the plugs with retaining rings.

[0012] The end face of the retaining ring is provided with an inclination angle of 10° to 20°.

[0013] The adapter structure at the end of the push rod can be any one of the following: an interface connector, a V-groove snap-fit, or a push pin.

[0014] The testing method using the integrated device for testing, sealing, protection, and disassembly of ultra-high pressure pipe fittings includes the following steps: S1: Adjust the screw until the front and rear plugs are open, place the test workpiece on the second slider, and install the matching sealing components and retaining rings on the front and rear plugs; S2: Simultaneously rotate the two screws to push the back baffle and the test workpiece forward, and continue to rotate the screws to squeeze the sealing assembly to complete the sealing assembly; S3: Connect to the ultra-high pressure booster through the through hole of the front plug for pressure testing; S4: After the test is completed, adjust the length of the push rod on the workpiece fixing nut so that the two push rods are fixed on the test workpiece. Simultaneously rotate the two screws in opposite directions to drive the rear baffle and the test workpiece to move at different speeds, so that the front and rear plugs are separated from the test workpiece. S5: Adjust the length of the two push rods, disconnect from the test workpiece, and remove the test workpiece.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. Reduce labor intensity and improve operational safety: This invention eliminates the tedious manual installation and disassembly of traditional tooling. It achieves multi-action coordinated completion through the rotation drive of the screw, eliminating the need for operators to carry heavy protective components and effectively reducing labor intensity. At the same time, the protective structure formed by the front and rear baffles can provide all-round protection for the test workpiece, avoiding safety accidents caused by the workpiece or seal falling off under ultra-high pressure conditions.

[0016] 2. Convenient handling of emergencies: In case of emergencies such as workpiece damage or jamming, the torque can be increased by extending the lever arm to release the jam without the need for additional auxiliary tools, which improves the efficiency of emergency response and reduces the difficulty of operation.

[0017] 3. Adaptable to small-angle end face workpieces, reducing assembly difficulty: The plastic soft seal designed in this invention adopts an improved necking structure, which can be directly assembled by extrusion without complicated adjustments, effectively solving the technical pain point of the difficulty in assembling soft seal rings for small-angle end face test pieces using traditional tooling.

[0018] 4. Helical differential speed design for efficient collaborative operation: The screw and the back baffle are connected by a large pitch thread, while the screw and the telescopic rod mechanism are connected by a small pitch thread. When the screw is rotated, the back baffle can slide quickly while the workpiece moves slowly, thus enabling the front and rear plugs to separate from the workpiece at the same time. This allows for multiple actions such as clamping, sealing, testing, and disassembly to be completed in one go, greatly improving operating efficiency and achieving time and labor saving.

[0019] 5. Simple structure, capable of semi-automatic upgrade: The overall structure of this invention is simple, easy to process, manufacture, maintain and move; for the needs of large-scale testing, an electric drive structure can be added to the screw to realize semi-automatic operation, further improve testing efficiency and adapt to the needs of industrial mass production.

[0020] 6. Strong adaptability: By replacing the front and rear plugs of different specifications, it can be adapted to various specifications and models of straight barrel-shaped test workpieces; the telescopic rod mechanism can adopt a variety of fixing structures according to the shape of the outer surface of the workpiece, and the end face of the workpiece can adapt to any angle, which greatly improves the adaptability of the device. Attached Figure Description

[0021] Figure 1 This is the front view of the present invention; Figure 2 This is a front view of the present invention after the test workpiece has been installed. Figure 3 This is a side view of the present invention after the test workpiece has been mounted. Figure 4 A perspective view of the present invention after the test workpiece has been mounted; Figure 5 An enlarged view of the assembly structure of the rear plug and sealing assembly in an embodiment of the present invention; Figure 6 for Figure 5 Sectional view along direction aa; Figure 7 A schematic diagram showing that the top rod end of the telescopic rod mechanism adopts a V-groove structure; Figure 8 A schematic diagram showing that the end of the push rod of the telescopic rod mechanism adopts a push pin structure; Figure 9 This is a schematic diagram of an interface connector structure used at the end of the top rod of a telescopic rod mechanism.

[0022] In the diagram: 1-base plate, 2-slide rail, 3-front baffle, 4-rear baffle, 5-screw, 6-front plug, 7-rear plug, 8-metal hard seal, 9-plastic soft seal, 10-retaining ring, 11-telescopic rod mechanism, 12-second slider, 13-test workpiece, 14-top rod, 15-base, 16-first slider, 17-through hole. Detailed Implementation

[0023] See attached document Figures 1-4 This invention provides an integrated device for testing, sealing, protection, disassembly, and assembly of ultra-high pressure pipe fittings, including a base plate platform 1, a slide rail 2, a front baffle 3, a rear baffle 4, a screw 5, a front plug 6, a rear plug 7, a metal hard seal 8, a plastic soft seal 9, a retaining ring 10, a telescopic rod mechanism 11, a first slider 16, a second slider 12, a test workpiece 13, and a top rod 14.

[0024] The specific structural details are as follows: The base plate 1 is made of high-strength alloy steel to ensure the overall load-bearing capacity of the device. The slide rail 2 is fixed to the upper surface of the base plate 1 by bolts. The slide rail 2 has a T-shaped cross-section, which is adapted to the T-shaped grooves set at the bottom of the first slider 16 and the second slider 12 to ensure the stability of the first slider 16 and the second slider 12 during the sliding process and avoid deviation.

[0025] The screw 5 is made of 40Cr alloy structural steel and is heat-treated to improve its strength and wear resistance. One end of the screw 5 is provided with a square interface for connecting an extended lever arm or an electric drive structure, and the other end is fitted with the round hole of the front baffle 3 through a bearing. The screw 5 is provided with two threads, one is a large-pitch thread with a pitch of 10mm, which is adapted to the rear baffle 4, and the other is a small-pitch thread with a pitch of 5mm, which is adapted to the nut of the telescopic rod mechanism 11. The differential speed movement between the rear baffle 4 and the telescopic rod 11 is achieved by the difference in the pitch of the two threads.

[0026] Both the front baffle 3 and the rear baffle 4 are welded from steel plates. The bottom of the front baffle 3 is fixedly connected to the base 15, which is fixed on the base plate 1, by bolts. The bottom of the rear baffle 4 is fixedly connected to the first slider 16 by bolts. The front baffle 3 has two symmetrical round holes for threading the screw 5. The round holes of the front baffle 3 and the screw 5 are connected by bearings without threads, allowing the screw 5 to rotate freely relative to the front baffle 3. The rear baffle 4 has two symmetrical threaded holes that are matched with the large-pitch thread section of the screw 5. The thread pitch is set to 10mm to ensure that the screw 5 can drive the rear baffle 4 to slide quickly when it rotates.

[0027] Both the front plug 6 and the rear plug 7 are made of stainless steel and can be detachably installed on the opposite inner side of the front and rear baffles by bolts, which facilitates quick replacement according to the specifications of the test workpiece 13. The front plug 6 has a through hole 17 in the middle. One end of the through hole 17 is connected to the output pipe of the ultra-high pressure booster, and the other end is connected to the inner cavity of the test workpiece 13 to realize the input of pressure medium. The ends of the front and rear plugs are provided with stepped grooves and threads for installing metal hard seals 8, plastic soft seals 9 and retaining rings 10.

[0028] See attached document Figures 5-6The metal hard seal 8 is made of copper alloy, and its sealing surface is a bevel structure with a bevel angle of 45°, forming a surface contact seal with the end face of the test workpiece 13, improving the sealing reliability under ultra-high pressure conditions. The plastic soft seal 9 is made of polyurethane and has been modified into a constricted structure with a constriction taper of 15°, which can be directly embedded into the stepped groove of the plug by extrusion without the need for additional fixing structure, especially suitable for test workpieces 13 with small-angle end faces. The retaining ring 10 is made of stainless steel and is connected to the end of the plug by threads. The end face of the retaining ring 10 has a 15° bevel, which matches the constriction taper of the plastic soft seal 9, ensuring that the plastic soft seal 9 can be pulled out synchronously after the test is completed.

[0029] See attached document Figures 7-9 The telescopic rod mechanism 11 is made of 40Cr alloy structural steel. The main body of the telescopic rod mechanism 11 is a nut with a threaded hole in the middle, which is adapted to the small-pitch thread section of the screw 5. A push rod 14 is provided on the inner side of the nut of the telescopic rod mechanism 11. The push rod 14 of the rotating telescopic rod mechanism 11 is used to clamp the outer surface of the test workpiece 13 to achieve a stable fixation of the workpiece. According to the design characteristics of the clamping point on the outer surface of the test workpiece 13, the adapter structure at the end of the push rod 14 can be one of V-groove clamping, push pin or interface connector.

[0030] The first slider 16 and the second slider 12 are made of cast iron. They have T-shaped grooves at the bottom to match the T-shaped slide rail 2 of the base plate 1. The upper surface of the first slider 16 is fixedly connected to the rear baffle 4 by bolts. The test workpiece 13 is placed on the upper surface of the second slider 12. The first slider 16 and the second slider 12 respectively drive the rear baffle 4 and the test workpiece 13 to slide along the slide rail 2.

[0031] The test workpiece 13 is a straight barrel-shaped structure made of seamless steel pipe, with its end face angle set at 15° to fit the sealing components of this device.

[0032] Example 1 is a case of testing a composite petrochemical pipe. The composite petrochemical pipe has an inner diameter of 60mm, an outer diameter of 130mm, a length of 400mm, a test pressure of 500MPa, a symmetrical double-ear countersunk hole design on the outer wall of the cylinder with a hole diameter of 30mm, and uses a telescopic top rod with an outer diameter of 28mm to clamp the test piece. The plug is made of high-strength stainless steel, the hard seal is made of 62 brass copper, and the soft seal uses a polyurethane U-shaped sealing ring.

[0033] Example 2 is a case of testing a stainless steel tubular high-pressure reactor. The stainless steel tubular high-pressure reactor has an inner diameter of 30mm, an outer diameter of 90mm, and a length of 300mm. The outer wall of the cylinder is in a smooth rough-machined state and is fixed by V-groove snap-fit. The plug is made of high-strength stainless steel, the hard seal is made of 62 brass, and the soft seal uses a polyurethane U-shaped sealing ring.

[0034] The operation procedures for Examples 1 and 2 are as follows: 1. Initial state adjustment: By manually rotating the two screws 5 in sync, the rear baffle 4 drives the first slider 16 to slide backward along the slide rail 2, and the device is in the open state. The distance between the front and rear baffles is greater than the length of the test workpiece 13.

[0035] 2. Installation of workpiece and sealing components: According to the specifications of the test workpiece 13, select the matching front plug 6 and rear plug 7, and install them on the front and rear baffles respectively with bolts; install the metal hard seal 8 and the plastic soft seal 9 in the stepped groove of the plug in sequence, and connect the retaining ring 10 to the end of the plug with threads; place the test workpiece 13 on the second slider 12, and adjust the position of the test workpiece so that both ends of the test workpiece are aligned with the front and rear plugs.

[0036] 3. Clamping and Sealing Assembly: The two screws 5 are rotated clockwise synchronously. The screws 5 drive the rear baffle 4 to slide forward along the slide rail 2 through the large-pitch thread. The rear baffle 4 pushes the test workpiece 13 forward synchronously. After the front end of the test workpiece 13 presses against the sealing assembly of the front plug 6, the screws 5 are rotated clockwise. The axial thrust of the screws 5 compresses the metal hard seal 8 and the plastic soft seal 9, so that the seals are tightly fitted with the end face of the test workpiece 13, completing the sealing assembly. At this time, the front and rear baffles and the screws 5 form a clamping and protective structure, which protects the test workpiece 13.

[0037] 4. Ultra-high pressure test: Connect the output pipe of the ultra-high pressure booster to the through hole 17 of the front plug 6, start the ultra-high pressure booster, input the pressure medium into the test workpiece 13, gradually increase the pressure to the test pressure, maintain the pressure for 30 minutes, observe whether there is any leakage in the test workpiece 13 and the sealing assembly, and complete the pressure test.

[0038] 5. Disassembly and workpiece removal: After the test is completed, turn off the ultra-high pressure booster and release the pressure inside the test workpiece 13; rotate the screw 5 counterclockwise to adjust the state of the fine adjustment device, and fix the telescopic rod mechanism 11 to the test workpiece 13 by the top rod 14; continue to rotate the screw 5 counterclockwise, and the screw 5 drives the telescopic rod mechanism 11 and the test workpiece 13 to slide slowly backward through the small pitch thread, while at the same time, it drives the rear baffle 4 to slide quickly backward through the large pitch thread, so that the front and rear plugs are separated from the test workpiece 13 synchronously, and the retaining ring 10 drives the plastic soft seal 9 and the metal hard seal 8 to detach from the end face of the test workpiece 13; disconnect the connection between the telescopic rod mechanism 11 and the test workpiece 13, and remove the test workpiece 13 from the second slider 12 to complete the entire test process.

[0039] When large-scale testing is required, the electric drive structure is connected to the square interface of screw 5. The control system controls the forward and reverse rotation and speed of the geared motor to achieve semi-automatic operation of the device and greatly improve testing efficiency. When sudden situations such as blockage or jamming occur, the extended lever arm is connected to the square interface of screw 5. The extended lever arm increases the rotational torque and quickly releases the jamming state.

[0040] The device of this invention has a simple structure and is easy to operate. Through the spiral differential speed design, it can achieve the coordinated completion of multiple actions, effectively reducing labor intensity, improving operational safety and testing efficiency. It can be widely used in the testing of ultra-high pressure pipe fittings in military, petrochemical and other fields.

Claims

1. An integrated device for testing, sealing, protecting, disassembling, and assembling ultra-high pressure pipe fittings, comprising a base plate, a front baffle, and a rear baffle, characterized in that: A slide rail is provided on the base plate, and a first slider and a second slider are slidably fitted on the slide rail. A front baffle and a rear baffle are positioned opposite each other on the slide rail. The front baffle is fixedly connected to the base plate by a base, and the rear baffle is fixed to the first slider. Bolt holes are symmetrically opened on the left and right sides of the rear baffle, and corresponding circular holes are opened on the front baffle. The screw that mates with the bolt holes is a variable pitch screw, with a small-pitch thread at the front and a large-pitch thread at the rear. The screw passes through the bolt holes in the rear baffle. The screw rod has a large-pitch threaded section that mates with a bolt hole. The front end of the screw rod is connected to the round hole of the front baffle by a bearing. On the small-pitch threaded section of the screw rod, a telescopic rod mechanism is connected by a threaded adapter. The telescopic rod mechanism consists of a nut and a push rod fixed to the inner end face of the nut that can adjust the length. A front plug and a rear plug are respectively provided on the opposite surfaces of the front baffle and the rear baffle. Sealing components are provided at the opposite ends of the front plug and the rear plug. A through hole for connecting ultra-high voltage equipment is provided in the middle of the front plug.

2. The integrated device for testing, sealing, protection, disassembly, and assembly of ultra-high pressure pipe fittings according to claim 1, characterized in that: The screw has two threads, and the thread pitch that mates with the rear baffle is greater than the thread pitch that mates with the nut of the telescopic rod mechanism, thereby achieving differential motion between the rear baffle and the telescopic rod mechanism.

3. The integrated device for testing, sealing, protection, disassembly, and assembly of ultra-high pressure pipe fittings according to claim 1, characterized in that: Both the front and rear plugs are provided with stepped grooves and threads at their ends for installing sealing components.

4. The integrated device for testing, sealing, protection, disassembly, and assembly of ultra-high pressure pipe fittings according to claim 3, characterized in that: The sealing assembly consists of a metal hard seal and a plastic soft seal.

5. The integrated device for testing, sealing, protection, disassembly, and assembly of ultra-high pressure pipe fittings according to claim 4, characterized in that: The sealing surface of the metal hard seal is a beveled structure with an angle of 40° to 60°.

6. The integrated device for testing, sealing, protection, disassembly, and assembly of ultra-high pressure pipe fittings according to claim 4, characterized in that: The plastic soft seal has a constricted opening structure with a constriction taper of 10° to 20°, and can be directly assembled by extrusion.

7. The integrated device for testing, sealing, protection, disassembly, and assembly of ultra-high pressure pipe fittings according to claim 1, characterized in that: The sealing assembly is installed on the stepped grooves at the ends of the front and rear plugs and is threadedly connected to the plugs with retaining rings.

8. The integrated device for testing, sealing, protection, disassembly, and assembly of ultra-high pressure pipe fittings according to claim 7, characterized in that: The end face of the retaining ring is provided with an inclination angle of 10° to 20°.

9. The integrated device for testing, sealing, protection, disassembly, and assembly of ultra-high pressure pipe fittings according to claim 1, characterized in that: The adapter structure at the end of the push rod can be any one of the following: an interface connector, a V-groove snap-fit, or a push pin.

10. A testing method using the integrated device for testing, sealing, protection, disassembly, and assembly of ultra-high pressure pipe fittings as described in any one of claims 1 to 9, characterized in that: Includes the following steps: S1: Adjust the screw until the front and rear plugs are open, place the test workpiece on the second slider, and install the matching sealing components and retaining rings on the front and rear plugs; S2: Simultaneously rotate the two screws to push the back baffle and the test workpiece forward, and continue to rotate the screws to squeeze the sealing assembly to complete the sealing assembly; S3: Connect to the ultra-high pressure booster through the through hole of the front plug for pressure testing; S4: After the test is completed, adjust the length of the push rod on the workpiece fixing nut so that the two push rods are fixed on the test workpiece. Simultaneously rotate the two screws in opposite directions to drive the rear baffle and the test workpiece to move at different speeds, so that the front and rear plugs are separated from the test workpiece. S5: Adjust the length of the two push rods, disconnect from the test workpiece, and remove the test workpiece.

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