Device for detecting sealing reliability of high-pressure oil pipe under vibration load

Abstract

The invention relates to the technical field of high-pressure oil pipe detection devices, and discloses a high-pressure oil pipe vibration load sealing reliability detection device which comprises a rack platform with an avoiding opening in the middle of the upper end, supporting frames are arranged on the left side and the right side of the upper end of the rack platform respectively, and a plurality of bases which are evenly distributed in a rectangular shape are installed at the upper end of the rack platform. A bearing plate is installed on the lower side of the receding opening in the rack platform, and vertical frames are installed at the upper end of the bearing plate in a bilateral symmetry mode. The sealing reliability detection device for the high-pressure oil pipe under the vibration load can effectively solve the problems that in the prior art, a high-pressure oil pipe sealing detection device generally does not have a low-frequency disturbance simulation function, so that the detection environment and the actual working condition deviate greatly, and the reference value of a detection result is limited; the problems that due to the fact that an effective position stabilizing structure is lacked for clamping limiting and sealing butt joint work of the high-pressure oil pipe, placing position deviation is caused by uneven gravity distribution of the two ends of the high-pressure oil pipe, and clamping accuracy and sealing butt joint reliability are further affected are solved.

Description

Technical Field

[0001] This invention relates to the field of high-pressure oil pipe testing equipment, specifically to a device for testing the sealing reliability of high-pressure oil pipes under vibration load. Background Technology

[0002] High-pressure fuel lines in automobiles are core safety components in the vehicle's power transmission and control systems. They are primarily used to transport high-pressure media (fuel, hydraulic oil, brake fluid, etc.), with operating pressures far exceeding those of ordinary low-pressure fuel lines. As a critical component for transporting high-pressure media such as fuel and hydraulic oil, the sealing reliability of high-pressure fuel lines directly determines the operational stability, safety, and service life of the equipment. In actual operation, high-pressure fuel lines are constantly subjected to complex low-frequency disturbances such as slight vibrations during engine operation, mechanical impacts, and media pulsation. The sealing surfaces are prone to micro-gaps due to fatigue from low-frequency vibrations, and the seals are susceptible to aging, deformation, or detachment, leading to high-pressure media leakage. This not only wastes resources but can also cause fires, equipment failures, or even major safety accidents.

[0003] To address this issue, this application designs a high-pressure oil pipe sealing reliability testing device under vibration load. Existing high-pressure oil pipe sealing testing devices generally lack low-frequency disturbance simulation capabilities, and the testing process is mostly conducted in a static environment. In practical applications, high-pressure oil pipes are often accompanied by slight shaking or low-frequency disturbances during operation. These shaking or low-frequency disturbances can exacerbate the wear and aging of seals at the oil pipe joints, and even lead to loosening of the sealing structure, thereby causing leakage. Firstly, static testing can only reflect the sealing state of high-pressure oil pipes under static conditions and cannot simulate the impact of slight shaking and low-frequency disturbances on sealing performance during actual operation, resulting in a large deviation between the testing environment and actual working conditions, and limiting the reference value of the test results. Secondly, the clamping, limiting, and sealing of high-pressure oil pipes mostly rely on manual placement of the high-pressure oil pipe and cylinder-driven limiting structure for clamping and engagement. Since high-pressure oil pipes are mostly special structures with irregular curved shapes and lack effective position stabilization structures, after manual placement, uneven weight distribution at both ends of the high-pressure oil pipe can cause placement position deviation, further affecting the clamping accuracy and sealing reliability. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a high-pressure oil pipe sealing reliability testing device under vibration load. This device effectively solves the problems of existing high-pressure oil pipe sealing testing devices generally lacking low-frequency disturbance simulation capabilities, only reflecting the sealing state of the high-pressure oil pipe under static conditions, leading to significant deviations between the testing environment and actual working conditions, and limited reference value of the test results. Furthermore, the device lacks an effective positional stabilization structure for clamping, limiting, and sealing the high-pressure oil pipe. After manual placement, uneven gravity distribution at both ends of the high-pressure oil pipe can cause placement position deviations, further affecting clamping accuracy and sealing reliability.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a device for testing the sealing reliability of high-pressure oil pipes under vibration load, comprising: The frame platform has a clearance opening in the middle of the upper part. Support frames are set on the left and right sides of the upper part of the frame platform. The support frames are U-shaped structures. Several rectangular bases are installed on the upper part of the frame platform. A support plate is installed on the lower side of the clearance opening on the frame platform. Vertical frames are symmetrically installed on the upper part of the support plate. A vibration simulation part is set on the support plate and the two vertical frames. Each base is equipped with a sealing detection part for sealing test of high pressure oil pipe. The support frames on the left and right sides are equipped with a placement part for assisting in placing high pressure oil pipe. The vibration simulation unit includes a vibrator mounted on the upper part of the support plate. The vibrator and the two uprights on the left and right are mounted on a mounting plate. The mounting plate consists of a C-shaped sleeve plate and a guide table with symmetrically opened receiving cavities on the upper part. The upper part of the mounting plate is connected to a bearing platform through a support spring. The bearing platform has a T-shaped structure. The lower part of the bearing platform is symmetrically equipped with guide slide rods on the left and right. The guide slide rods are slidably connected to the inner wall of the corresponding receiving cavity. An oil pipe fixing group is set on the bearing platform.

[0006] Furthermore, the sealing detection unit includes slide rails symmetrically installed at the front and rear of the upper end of the base. A mounting slide is slidably installed on both slide rails. An adjusting screw is also rotatably installed at the end of the base away from the bearing platform. The adjusting screw is threadedly connected to the mounting slide. A handwheel is installed at the end of the adjusting screw away from the bearing platform. An airtightness detection group is provided on the mounting slide.

[0007] Furthermore, a limiting groove is provided in the middle of the upper part of the vertical section of the bearing platform, and alignment grooves are symmetrically provided on the left and right sides of the upper part of the vertical section of the bearing platform. Several slots are evenly distributed in a circle on the inner wall of the alignment groove, and several spring dampers are also installed together between the bearing platform and the mounting plate in a rectangular even distribution.

[0008] Furthermore, the placement part includes a mounting plate that is slidably installed on the inner wall of the support frame. A support slide rod that slides through the support frame is installed on the upper end of the mounting plate. A compression spring is sleeved on the outer wall of the support slide rod between the support frame and the mounting plate. The mounting plate has symmetrical placement holes at the front and back of the end facing the bearing platform. The placement holes are U-shaped. The upper end of the mounting plate has symmetrical positioning grooves at the front and back. The positioning grooves are connected to the placement holes. A clamping slide is slidably installed on the inner wall of the positioning groove through the compression spring. The upper end of the clamping slide has a wedge-shaped structure. Electromagnets are embedded at both the front and back ends of the mounting plate.

[0009] Furthermore, the oil pipe fixing assembly includes a positioning fixture 1 installed at the upper end of the horizontal base plate of the bearing platform. Several positioning fixtures 1 are provided and are evenly distributed in a rectangular shape. An installation slide plate is slidably installed on the inner wall of the limiting slide groove by a compression spring. A cover plate is installed on the upper end of the installation slide plate. The cover plate is integrally composed of a rectangular plate and two extension plates with pre-drilled circular sliding holes on the left and right. A positioning fixture 2 is installed on the lower end of the cover plate corresponding to several positioning fixtures 1 through a connecting rod. The opposite ends of positioning fixtures 1 and positioning fixture 2 are wedge-shaped structures with semi-circular grooves.

[0010] Furthermore, the tubing fixing assembly also includes an alignment slide rod that is movably arranged in the alignment groove and the circular sliding hole. The alignment slide rod is composed of a round rod and a cylinder. The lower end of the cylinder on the alignment slide rod is rotatably connected to the cover plate. The lower side of the outer wall of the alignment slide rod is provided with a mounting groove corresponding to several slots. A snap-fit ​​slider is slidably installed on the inner wall of the mounting groove by a compression spring. The snap-fit ​​end of the snap-fit ​​slider is rounded.

[0011] Furthermore, the oil pipe fixing assembly also includes positioning magnets embedded between the opposite ends of the cylinders on the cover plate and the alignment slide rod. Several positioning magnets are provided, and the several positioning magnets are evenly distributed in a circle.

[0012] Furthermore, the airtightness testing unit includes an air pump installed at the end of the mounting slide away from the support platform. An air duct adapter is installed at the end of the mounting slide facing the support platform through an opening. The air pump is connected to a flexible hose through the air duct adapter. A sealing joint is connected at the end of the flexible hose away from the air pump. A bracket for placing and fixing the flexible hose is installed at the upper end of the mounting slide.

[0013] The technical solution provided by this invention has the following advantages compared with the prior art: This invention provides a high-pressure oil pipe sealing reliability testing device under vibration load. During the high-pressure oil pipe auxiliary limiting stage, the operator holds the high-pressure oil pipe while sequentially pulling out the left and right support slide rods upwards until both ends of the high-pressure oil pipe are inserted into the corresponding placement holes. At this time, the two adjacent clamping slides will approach each other and fit tightly against the outer wall of the high-pressure oil pipe. Then, several electromagnets are controlled to work simultaneously, and the left and right mounting horizontal plates will be tightly magnetically connected to the inner wall of the corresponding support frame through the magnetic attraction force of the electromagnets, preventing the mounting horizontal plates from shifting vertically. By using two adjacent clamping slides to clamp the high-pressure oil pipe together, and using electromagnets to magnetically stabilize the mounting horizontal plates, this method avoids the problem that conventional high-pressure oil pipe sealing testing devices lack an effective position stabilization structure. After manually placing the high-pressure oil pipe, uneven weight distribution at both ends of the high-pressure oil pipe can cause position shifts, further affecting the clamping accuracy and sealing reliability.

[0014] After the vibrator stabilizes, the air pump needs to be started. The air pump delivers compressed gas to the sealing joint through the air duct adapter and flexible hose, allowing the compressed gas to enter the high-pressure oil pipe under test. Once the pressure inside the high-pressure oil pipe reaches the preset value, the air pump stops supplying gas, and the testing device enters the pressure holding stage. At the same time, the external data acquisition system begins to record the pressure change data inside the oil pipe to determine the test results. By using a method that simulates low-frequency disturbances and performs airtightness testing simultaneously, the sealing reliability of the high-pressure oil pipe under actual working conditions can be accurately tested. This avoids the problem that static testing cannot detect high-pressure oil pipe seal failure caused by low-frequency disturbances, as well as the problem of large deviations between the testing environment and actual working conditions. Through the synergistic effect of the air pump, flexible hose, and sealing joint, stable delivery and sealing of compressed gas can be achieved, ensuring the accuracy of airtightness testing. At the same time, the use of flexible hose can accommodate the slight displacement of the high-pressure oil pipe under low-frequency vibration testing environment, avoiding the problem of loosening and falling off at the connection between the high-pressure oil pipe and the sealing joint due to low-frequency vibration or shaking during airtightness testing. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure in an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the frame platform, support frame, and sealing detection unit in an embodiment of the present invention; Figure 3This is a schematic diagram of the three-dimensional separation of the base and the sealing detection part in an embodiment of the present invention; Figure 4 This is a schematic diagram of a partial three-dimensional cross-section of the support plate, the upright frame, and the vibration simulation unit in an embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of the bearing platform, guide slide, and oil pipe fixing assembly in an embodiment of the present invention; Figure 6 This is a schematic diagram of the three-dimensional separation of the oil pipe fixing assembly in an embodiment of the present invention; Figure 7 This is a schematic diagram of the three-dimensional separation of the support platform, mounting plate, and cover plate in an embodiment of the present invention; Figure 8 This is a schematic diagram of the three-dimensional separation of the alignment slide rod and the snap-fit ​​slider in an embodiment of the present invention; Figure 9 This is a schematic diagram of the three-dimensional separation of the placement part in an embodiment of the present invention.

[0017] The labels in the diagram represent: 1. Frame platform; 2. Support frame; 3. Base; 4. Support plate; 5. Stand; 6. Vibration simulation unit; 61. Vibrator; 62. Mounting plate; 63. Bearing platform; 631. Limiting slide; 632. Alignment slot; 633. Slot; 64. Guide slide rod; 65. Oil pipe fixing assembly; 651. Positioning fixture one; 652. Mounting slide plate; 653. Cover plate; 654. Alignment slide rod; 65 5. Mounting slot; 656. Snap-fit ​​slider; 657. Positioning magnet; 658. Positioning fixture two; 7. Sealing test section; 71. Slide rail; 72. Mounting slide; 73. Adjusting screw; 74. Handwheel; 75. Air tightness test group; 751. Air pump; 752. Flexible hose; 753. Sealing joint; 754. Clip seat; 8. Placement section; 81. Mounting cross plate; 82. Supporting slide rod; 83. Clamping slide; 84. Electromagnet. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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 present invention will be further described below with reference to embodiments. Example

[0020] Please see Figures 1-9This invention provides a technical solution: a device for testing the sealing reliability of high-pressure oil pipes under vibration load, comprising: A frame platform 1 with a clearance opening in the middle of the upper end is provided. Support frames 2 are respectively provided on the left and right sides of the upper end of the frame platform 1. The support frames 2 are of the C-shaped structure. Several rectangular bases 3 are installed on the upper end of the frame platform 1. A support plate 4 is installed on the frame platform 1 below the clearance opening. Vertical frames 5 are symmetrically installed on the upper end of the support plate 4. A vibration simulation part 6 is provided on the support plate 4 and the two vertical frames 5. A sealing detection part 7 for sealing test of high pressure oil pipe is provided on each base 3. A placement part 8 for assisting in placing high pressure oil pipe is provided on the support frames 2 on both the left and right sides. The vibration simulation unit 6 includes a vibrator 61 installed on the upper end of the support plate 4. The vibrator 61 and the two left and right uprights 5 are jointly mounted on a mounting plate 62. The mounting plate 62 is composed of a U-shaped sleeve plate and a guide table with symmetrically opened receiving cavities on the upper end. The upper end of the mounting plate 62 is connected to a bearing platform 63 through a support spring. The bearing platform 63 has a T-shaped structure. The lower end of the bearing platform 63 is symmetrically mounted with guide slide rods 64. The guide slide rods 64 are slidably connected to the inner wall of the corresponding receiving cavity. An oil pipe fixing group 65 is provided on the bearing platform 63.

[0021] The sealing detection unit 7 includes slide rails 71 symmetrically installed at the front and rear of the upper end of the base 3. The two slide rails 71 are slidably mounted on the mounting slide 72. An adjusting screw 73 is also rotatably installed through the end of the base 3 away from the bearing platform 63. The adjusting screw 73 is threaded to the mounting slide 72, and a handwheel 74 is installed at the end of the adjusting screw 73 away from the bearing platform 63. An airtightness detection group 75 is provided on the mounting slide 72.

[0022] A limiting groove 631 is provided in the middle of the upper part of the vertical section of the bearing platform 63. Alignment grooves 632 are symmetrically provided on the left and right sides of the upper part of the vertical section of the bearing platform 63. Several slots 633 are evenly distributed in a circle on the inner wall of the alignment grooves 632. Several spring dampers evenly distributed in a rectangle are also installed between the bearing platform 63 and the mounting plate 62.

[0023] The placement part 8 includes a mounting plate 81 that is slidably mounted on the inner wall of the support frame 2. A support slide rod 82 that slides through the support frame 2 is mounted on the upper end of the mounting plate 81. A compression spring is sleeved on the outer wall of the support slide rod 82 between the support frame 2 and the mounting plate 81. The mounting plate 81 has symmetrical placement holes at the front and back of one end facing the bearing platform 63. The placement holes are U-shaped. The upper end of the mounting plate 81 has symmetrical positioning grooves that are connected to the placement holes. A clamping slide seat 83 is slidably mounted on the inner wall of the positioning groove through a compression spring. The upper end of the clamping slide seat 83 has a wedge-shaped structure. Electromagnets 84 are embedded at both the front and back ends of the mounting plate 81.

[0024] The oil pipe fixing assembly 65 includes a positioning fixture 651 installed at the upper end of the horizontal base plate of the bearing platform 63. Several positioning fixtures 651 are provided, and the several positioning fixtures 651 are evenly distributed in a rectangular shape. An installation slide plate 652 is slidably installed on the inner wall of the limiting slide groove 631 by a compression spring. A cover plate 653 is installed on the upper end of the installation slide plate 652. The cover plate 653 is integrally composed of a rectangular plate and two extension plates with pre-drilled circular sliding holes on the left and right. The lower end of the cover plate 653 is equipped with a positioning fixture 658 corresponding to several positioning fixtures 651 via a connecting rod. The opposite ends of the positioning fixtures 651 and the positioning fixtures 658 are wedge-shaped structures with semi-circular grooves.

[0025] The oil pipe fixing assembly 65 also includes an alignment slide rod 654 that is movably disposed in the alignment groove 632 and the circular sliding hole. The alignment slide rod 654 is composed of a round rod and a cylinder. The lower end of the cylinder on the alignment slide rod 654 is rotatably connected to the cover plate 653. The lower side of the outer wall of the alignment slide rod 654 is provided with a mounting groove 655 corresponding to several slots 633. A snap-fit ​​slider 656 is slidably installed on the inner wall of the mounting groove 655 by means of a compression spring. The snap-fit ​​end of the snap-fit ​​slider 656 is rounded.

[0026] The oil pipe fixing assembly 65 also includes positioning magnets 657 embedded between the opposite ends of the cylinders on the cover plate 653 and the alignment slide bar 654. There are several positioning magnets 657, and the several positioning magnets 657 are evenly distributed around the circumference.

[0027] The airtightness testing unit 75 includes an air pump 751 installed at the end of the mounting slide 72 away from the support platform 63. An air duct adapter is installed at the end of the mounting slide 72 facing the support platform 63 through an opening. The air pump 751 is connected to a flexible hose 752 through the air duct adapter. The end of the flexible hose 752 away from the air pump 751 is connected to a sealing joint 753. A bracket 754 for placing and fixing the flexible hose 752 is installed at the upper end of the mounting slide 72.

[0028] In practice: First, the vibration simulation unit 6 in this application is used to simulate the low-frequency disturbance environment of the high-pressure oil pipe during actual use, and to clamp and limit the high-pressure oil pipe. When the vibrator 61 is working, a buffer spring can also be set between the C-shaped sleeve of the mounting plate 62 and the vibration guide table to buffer the vibration and prevent the vibration guide table from directly transmitting the vibration to the frame platform 1 when the vibrator 61 is working, which would affect the testing device. The sealing test unit 7 is used to perform sealing tests on the high-pressure oil pipe. The adjusting screw 73 on the base 3 can be used to adjust the distance between the mounting slide 72 and the bearing platform 63 to accommodate high-pressure oil pipes of different lengths. The clamping seat 754 can be used to place the flexible hose 752 and the sealing joint 753 in the unused state. The placement unit 8 is used to assist in limiting the high-pressure oil pipe after it is placed on the corresponding two positioning fixtures 651 to prevent its placement position from shifting and affecting the subsequent clamping accuracy and sealing reliability.

[0029] It should be noted that the sealing joint 753 can be freely selected to use a suitable quick-release joint or an internal expansion joint according to the structure of the high-pressure oil pipe joint end. The several positioning fixtures 651 and 658 on the bearing platform 63 can all adopt quick-release fixture structures for easy disassembly and replacement, thus easily adapting to high-pressure oil pipes of different shapes and specifications. This is existing technology and will not be described in detail here. Specifically, taking the vertical section of the bearing platform 63 as the boundary, the two positioning fixtures 651 on the left and right sides of the same side and the left and right... The two positioning fixtures 658 work together to clamp and limit the high-pressure oil pipe to be tested. In addition, the clearance at the upper end of the frame platform 1 is larger than the mounting plate 62. The mounting plate 62 and the bearing platform 63 will not be affected by the obstruction of the frame platform 1, thus affecting the low-frequency disturbance simulation effect. It should also be noted that the clamping end faces of the clamping slide 83, positioning fixture 651, and positioning fixture 658 can all be made of elastic pads, which can not only increase the friction with the outer wall of the high-pressure oil pipe, but also increase the clamping amount compensation effect.

[0030] Initially, the left and right alignment slide rods 654 are not in the snap-fit ​​alignment state. Under the action of the compression spring, the mounting slide 652 drives the cover plate 653 to the uppermost position. At this time, each adjacent positioning fixture 1 651 and positioning fixture 2 658 are in a state of mutual distance, and several snap-fit ​​sliders 656 and several slots 633 are in an interleaved state. At this time, several snap-fit ​​sliders 656 retract into the corresponding mounting slots 655, and several positioning magnets 657 on the alignment slide rods 654 respectively engage with several corresponding positioning magnets on the cover plate 653. Iron 657 is in a tightly magnetically connected state, and the mounting slides 72 on both sides are adjusted by adjusting screws 73. The distance between the mounting slides 72 and the bearing platform 63 is matched with the length of the high-pressure oil pipe to be tested. In addition, several electromagnets 84 are in a non-working state, and the two mounting horizontal plates 81 on the left and right are located at the lowest side of the corresponding sliding space. At this time, the compression springs sleeved on the outer wall of the support slide rod 82 are in a free state, and each pair of adjacent clamping slides 83 are also close to each other and in a tightly fitted state under the action of the compression springs.

[0031] During the high-pressure oil pipe placement stage, the operator first places the high-pressure oil pipe to be tested on the two positioning fixtures 651 on the corresponding side. Based on the length and curvature of the high-pressure oil pipe, the semi-circular groove at the upper end of the positioning fixture 651 is used to initially limit the high-pressure oil pipe, and the placement position of the high-pressure oil pipe on the two positioning fixtures 651 is adjusted to be roughly centered. During this process, since the height of the wedge end face of the left positioning fixture 651 is lower than the height of the wedge end face of the right positioning fixture 651, the high-pressure oil pipe can naturally present an inclination angle consistent with the actual working state. After one high-pressure oil pipe is placed, this step is repeated to place the other high-pressure oil pipe on the two positioning fixtures 651 on the other side. The design of using several positioning fixtures 651 can achieve multi-point support and positioning of the high-pressure oil pipe. Moreover, since the height of the wedge end face of the left positioning fixture 651 is lower than the height of the wedge end face of the right positioning fixture 651, the high-pressure oil pipe can simulate the actual installation angle without additional adjustment, simplifying the clamping operation.

[0032] During the high-pressure oil pipe auxiliary limiting stage, it should be noted that the clamping end of the clamping slide 83 has a semi-circular cavity structure, and the semi-circular cavities of two adjacent clamping slides 83 can be combined to form a circular cavity that matches the diameter of the high-pressure oil pipe. When the high-pressure oil pipe to be tested is placed on the corresponding two positioning fixtures 651, the operator holds the high-pressure oil pipe while pulling out the left and right support slides 82 one by one. The support slides 82 will drive the corresponding clamping slides 83 to move upward synchronously through the mounting plate 81 until both ends of the high-pressure oil pipe are inserted into the corresponding placement holes. At this time, the outer walls of both ends of the high-pressure oil pipe are respectively movably attached to the inner walls of the corresponding placement holes. During this period, the two ends of the high-pressure oil pipe will respectively squeeze the corresponding two clamping slides 83. Since the upper end of the clamping slide 83 has a wedge-shaped structure, the two adjacent clamping slides 83 will move away from each other after being squeezed by the high-pressure oil pipe. The high-pressure oil pipe is smoothly inserted into the corresponding placement hole by avoiding obstacles. After the high-pressure oil pipe enters the corresponding placement hole, under the action of the compression spring, the two adjacent clamping slides 83 will move closer to each other and fit tightly against the outer wall of the high-pressure oil pipe. Then, several electromagnets 84 are controlled to work simultaneously. The two mounting horizontal plates 81 on the left and right will be tightly magnetically connected to the inner wall of the corresponding support frame 2 by the magnetic attraction force of the electromagnets 84, so as to avoid the vertical displacement of the mounting horizontal plate 81. By using the two adjacent clamping slides 83 to clamp the high-pressure oil pipe together and the electromagnets 84 to magnetically stabilize the mounting horizontal plate 81, the conventional high-pressure oil pipe sealing detection device can avoid the problem that the conventional high-pressure oil pipe sealing detection device lacks an effective position stabilization structure. After the high-pressure oil pipe is manually placed, the uneven distribution of gravity at both ends of the high-pressure oil pipe will cause the placement position to shift, which will further affect the clamping accuracy and sealing reliability.

[0033] During the high-pressure oil pipe clamping and positioning stage, after the high-pressure oil pipe to be inspected passes through several clamping slide blocks 83 for clamping and limiting, the operator first rotates the left and right alignment slide blocks 654 by 90 degrees through the cylinders on the alignment slide blocks 654. The alignment slide blocks 654 will drive the corresponding several locking sliders 656 to rotate 90 degrees synchronously. During this process, as the alignment slide blocks 654 rotate, the several positioning magnets 657 on the alignment slide blocks 654 will first release their magnetic connection with the corresponding several positioning magnets 657 on the cover plate 653, and then restore their magnetic connection with the corresponding several positioning magnets 657 on the cover plate 653. At this time, the several locking sliders 656 on the alignment slide blocks 654 will correspond to the corresponding locking slots 633 respectively. It should be noted that when the alignment slide blocks 654 rotate 90 degrees, the rotation direction needs to be the same as the rotation direction facing the rounded corner structure side of the locking slider 656. Next, the operator presses down on the cover plate 653. The cover plate 653 will drive the two left and right alignment slide rods 654 and several positioning fixtures 658 to move downwards synchronously until the positioning fixtures 658 move to the appropriate position. At this time, the positioning fixtures 658 and the adjacent positioning fixtures 651 will clamp and limit the high-pressure oil pipe together. The clamping and limiting method of manual snap-fit ​​is used to realize the automatic clamping of the high-pressure oil pipe without the need for cylinder assistance. This avoids the problems of conventional cylinder drive requiring the matching air circuit system, solenoid valve, air pressure regulating device, etc., which leads to complex structure and large size of the detection device, increasing the manufacturing cost and maintenance difficulty of the equipment. It can also avoid the problem that the high-pressure oil pipe will be plastically deformed due to excessive clamping force of the cylinder, and the high-pressure oil pipe will not be stably positioned during the detection process if the clamping force is too small, which will cause the high-pressure oil pipe to shift and the sealing joint 753 to loosen and fall off.

[0034] It should be noted that after several positioning fixtures 658 move downwards synchronously, it is also necessary to control the inner walls of the semi-circular grooves on the wedge-shaped end faces of the corresponding left and right positioning fixtures 658 to be tightly fitted against the outer wall of the high-pressure oil pipe. At this time, the height of the corresponding locking sliders 656 on the alignment slide rod 654 will be at the same level as the height of the corresponding locking slots 633. Under the action of the compression spring, the locking sliders 656 will extend out of the corresponding mounting slots 655 and insert into the corresponding locking slots 633, thereby achieving the locking and alignment effect between the alignment slide rod 654 and the bearing platform 63. This can avoid the problem of positional displacement of the high-pressure oil pipe during the subsequent air tightness test under the simulated low-frequency disturbance environment. At the same time, the positioning magnets 657 on the cylinder and the opposite end of the cover plate 653 on the alignment slide rod 654 attract each other, which can also fix the angle between the alignment slide rod 654 and the positioning magnets 657, ensuring the stability of the high-pressure oil pipe clamping and limiting by the positioning fixtures 651 and 658.

[0035] After positioning fixture 1 651 and positioning fixture 2 658 jointly clamp and limit the high-pressure oil pipe, several electromagnets 84 need to be stopped simultaneously. Then, the operator presses down the left and right support slide rods 82 in sequence. The support slide rods 82 will drive several corresponding clamping slides 83 to move down synchronously through the mounting plate 81 until both ends of the high-pressure oil pipe are removed from the corresponding placement holes. During this process, both ends of the high-pressure oil pipe will squeeze the corresponding two clamping slides 83. Since the clamping end of the clamping slide 83 is a semi-circular cavity structure, the two adjacent clamping slides 83 can also move away from each other again after being squeezed by the high-pressure oil pipe, so that the high-pressure oil pipe can be smoothly removed from the corresponding placement hole. After the high-pressure oil pipe is removed from the corresponding placement hole, under the action of the compression spring, the support slide rod 82 will drive the mounting plate 81 to move down and return to its original position, once again located at the bottom of the corresponding sliding space.

[0036] During the sealing test section 7 docking stage, if the positions of several bases 3 need to be adjusted according to the height positions of the interfaces at both ends of the high-pressure oil pipe to be tested, the operator turns the handwheel 74. The handwheel 74 will drive the adjusting screw 73 to rotate synchronously in both directions. Since the adjusting screw 73 is threadedly connected to the mounting slide 72, as the adjusting screw 73 rotates in both directions, the mounting slide 72 will slide back and forth along the slide rail 71 until the sealing joint 753 on the mounting slide 72 can be smoothly aligned with the end interface of the high-pressure oil pipe. Then, the handwheel 74 can be stopped. By driving the adjusting screw 73 through the handwheel 74, the position of the sealing joint 753 can be adjusted. It can also be adapted to high-pressure oil pipes of different lengths, improving the versatility of the testing device. Moreover, the adjusting screw 73 and the mounting slide 72 have the self-locking characteristic of the threaded connection, which can keep the position of the sealing joint 753 stable after docking with the high-pressure oil pipe.

[0037] After the positions of several bases 3 are adjusted, the operator sequentially connects several sealing joints 753 to the end interfaces of the corresponding high-pressure oil pipes to achieve a sealing connection. The operator then checks the tightness of the connection between the air pump 751, the flexible hose 752, and the sealing joints 753 to ensure that there are no leaks in any of the air passages.

[0038] During the airtightness testing phase, after several sealing joints 753 have been connected to the end interfaces of their corresponding high-pressure oil pipes, the vibrator 61 is activated. The vibrator 61 transmits vibration to the bearing platform 63 via the mounting plate 62. Under the sliding cooperation of the guide slide rod 64 and the cavity on the mounting plate 62, the bearing platform 63 reciprocates vertically. Simultaneously, the support springs and spring dampers between the bearing platform 63 and the mounting plate 62 work together to buffer and adjust the vibration transmitted to the bearing platform 63, stabilizing the vibration frequency and amplitude of the bearing platform 63 within a preset range. Within the range, during the vibration process, the bearing platform 63 can transmit the vibration to several positioning fixtures 651, mounting slide plate 652 and cover plate 653. The cover plate 653 can transmit the vibration to several positioning fixtures 658 through the connecting rod. Therefore, both the positioning fixtures 651 and 658 can transmit the vibration to the corresponding high-pressure oil pipe. That is, both the front and rear high-pressure oil pipes will follow the bearing platform 63 to vibrate synchronously at low frequency, thereby simulating the effect of high-pressure oil pipes working in a low-frequency disturbance environment and providing real environmental conditions for sealing reliability testing.

[0039] After the vibrator 61 has stabilized, the air pump 751 needs to be started. The air pump 751 delivers compressed gas to the sealing joint 753 through the air duct adapter and flexible hose 752, allowing the compressed gas to enter the high-pressure oil pipe to be tested. Once the pressure inside the high-pressure oil pipe reaches the preset value, the air pump 751 stops supplying gas, and the testing device enters the pressure holding stage. At the same time, the external data acquisition system begins to record the pressure change data inside the oil pipe, continuously monitoring the vibration state and pressure data. If the pressure drop exceeds the preset leakage threshold, the high-pressure oil pipe is deemed unqualified for sealing. If the pressure remains stable, the high-pressure oil pipe is deemed qualified for sealing. The simulation of low-frequency disturbance and air tightness testing are used. The simultaneous testing method can accurately detect the sealing reliability of high-pressure oil pipes under actual working conditions, avoiding the inability of static testing to detect high-pressure oil pipe seal failure caused by low-frequency disturbances, as well as the problem of large deviations between the testing environment and actual working conditions. Through the synergistic action of air pump 751, flexible hose 752 and sealing joint 753, stable delivery and sealing of compressed gas can be achieved, ensuring the accuracy of airtightness testing. At the same time, the use of flexible hose 752 can adapt to the slight displacement of high-pressure oil pipes in low-frequency vibration testing environment, avoiding the problem of loosening and falling off at the joint between high-pressure oil pipes and sealing joint 753 due to low-frequency vibration or shaking during airtightness testing.

[0040] During the reset phase of the testing device, after the airtightness test of the high-pressure oil pipe is completed, the vibrator 61 and the external data acquisition system are first shut down. Then, the gas in the high-pressure oil pipe is depressurized through the external pressure relief valve. After the compressed air in the high-pressure oil pipe is depressurized, the operator rotates the left and right alignment slide rods 654 by 90 degrees through the cylinder on the alignment slide rod 654. The alignment slide rod 654 will drive the corresponding number of locking sliders 656 to rotate 90 degrees synchronously. During this process, as the alignment slide rod 654 rotates, the number of positioning magnets 657 on the alignment slide rod 654 will first release the magnetic connection with the corresponding number of positioning magnets 657 on the cover plate 653, and then restore the magnetic connection with the corresponding number of positioning magnets 657 on the cover plate 653. During this process, the number of locking sliders 656 will rotate 90 degrees. The rounded corners of block 656 will be subjected to compressive force and will be disengaged from their corresponding slots 633. At this time, several locking sliders 656 will be in an alternating state with several slots 633. Then, under the action of the compression spring, the compression springs on the left and right alignment sliders 654 will change from a compressed state to a free state. The mounting slide plate 652 will drive the cover plate 653 to slide upward synchronously along the inner wall of the limiting slide groove 631. The cover plate 653 will drive several positioning fixtures 658 to move upward synchronously, thereby releasing the clamping and limiting effect on the high-pressure oil pipe. Finally, the operator can remove the high-pressure oil pipe that has been inspected on both sides from the positioning fixture 651. The convenient disassembly of the alignment slider 654 and the easy opening of the cover plate 653 simplify the disassembly process of the high-pressure oil pipe.

[0041] In summary, this application has the following advantages: Advantage 1: During the high-pressure oil pipe clamping and positioning stage, the operator first places the high-pressure oil pipe to be tested on the two positioning fixtures 651 on the corresponding side. The semi-circular groove at the upper end of the positioning fixture 651 is used to initially limit the high-pressure oil pipe, and the position of the high-pressure oil pipe on the two positioning fixtures 651 is adjusted to be roughly centered. After one high-pressure oil pipe is placed, this step is repeated to place the other high-pressure oil pipe on the two positioning fixtures 651 on the other side. The design of using several positioning fixtures 651 can achieve multi-point support and positioning of the high-pressure oil pipe. Moreover, the height of the wedge-shaped end face of the left positioning fixture 651 is lower than the height of the wedge-shaped end face of the right positioning fixture 651. The high-pressure oil pipe can simulate the actual installation angle without additional adjustment, simplifying the clamping operation.

[0042] Secondly, during the high-pressure oil pipe auxiliary limiting stage, the operator holds the high-pressure oil pipe while simultaneously pulling out the left and right support slide rods 82 one by one until both ends of the high-pressure oil pipe are inserted into the corresponding placement holes. At this time, the two adjacent clamping slides 83 will approach each other and fit tightly against the outer wall of the high-pressure oil pipe. Then, several electromagnets 84 are controlled to work simultaneously, and the left and right mounting horizontal plates 81 will be tightly magnetically connected to the inner wall of the corresponding support frame 2 through the magnetic attraction force of the electromagnets 84, preventing the mounting horizontal plates 81 from shifting vertically. By using the two adjacent clamping slides 83 to clamp the high-pressure oil pipe together, and the electromagnets 84 to magnetically stabilize the mounting horizontal plates 81, the conventional high-pressure oil pipe sealing detection device can avoid the problem that the conventional high-pressure oil pipe sealing detection device lacks an effective position stabilization structure. After the high-pressure oil pipe is manually placed, the uneven distribution of gravity at both ends of the high-pressure oil pipe will cause the placement position to shift, further affecting the clamping accuracy and sealing reliability.

[0043] Thirdly, during the high-pressure oil pipe clamping and positioning stage, after the high-pressure oil pipe to be inspected has passed through several clamping slide blocks 83 for clamping and limiting, the operator first rotates the left and right alignment slide blocks 654 by 90 degrees through the cylinders on the alignment slide blocks 654. The several positioning magnets 657 on the alignment slide blocks 654 will first release their magnetic connection with the corresponding several positioning magnets 657 on the cover plate 653, and then re-establish their magnetic connection with the corresponding several positioning magnets 657 on the cover plate 653. Then, the operator presses down on the cover plate 653 until several positioning fixtures 658 move to the appropriate position. At this time, the positioning fixtures... The 2658 fixture, together with the adjacent positioning fixture 651, clamps and limits the high-pressure oil pipe. It adopts a manual clamping and limiting method to achieve automatic clamping of the high-pressure oil pipe without the need for cylinder assistance. This avoids the problems of conventional cylinder drive requiring the installation of air circuit systems, solenoid valves, air pressure regulating devices, etc., which leads to complex structure and large size of the detection device, increasing the manufacturing cost and maintenance difficulty of the equipment. It can also avoid the problems of excessive clamping force of the cylinder causing plastic deformation of the high-pressure oil pipe, and insufficient clamping force failing to ensure stable positioning of the high-pressure oil pipe during the detection process, resulting in displacement of the high-pressure oil pipe position and loosening and falling off of the sealing joint 753.

[0044] Fourthly, after several positioning fixtures 658 move downwards synchronously, it is also necessary to control the inner walls of the semi-circular grooves on the wedge-shaped end faces of the corresponding left and right positioning fixtures 658 to be tightly fitted to the outer wall of the high-pressure oil pipe. At this time, the height of the corresponding several locking sliders 656 on the alignment slide rod 654 will be at the same horizontal level as the height of the corresponding several locking slots 633. The several locking sliders 656 will extend out of the corresponding mounting slots 655 and insert into the corresponding locking slots 633, thereby achieving the effect of locking and aligning the alignment slide rod 654 with the bearing platform 63. This can avoid the problem of positional deviation of the high-pressure oil pipe during the subsequent air tightness test under the simulated low-frequency disturbance environment. At the same time, the positioning magnets 657 on the cylinder and the opposite end of the cover plate 653 on the alignment slide rod 654 attract each other, which can also fix the angle between the alignment slide rod 654 and the positioning magnets 657, ensuring the stability of the high-pressure oil pipe clamping and limiting by the positioning fixtures 651 and 658.

[0045] Fifthly, during the airtightness testing stage, after several sealing joints 753 have completed their docking with the end interfaces of the corresponding high-pressure oil pipes, the vibrator 61 is activated first. The vibrator 61 transmits the vibration to the bearing platform 63 through the mounting plate 62. The bearing platform 63 can transmit the vibration to several positioning fixtures 651, mounting slides 652, and cover plates 653. Both the positioning fixtures 651 and 658 can transmit the vibration to the corresponding high-pressure oil pipes. That is, both the front and rear high-pressure oil pipes will follow the bearing platform 63 to vibrate synchronously at low frequency, thereby simulating the operation of high-pressure oil pipes in a low-frequency disturbance environment and providing realistic environmental conditions for sealing reliability testing.

[0046] Advantage six: After the vibrator 61 is working stably, the air pump 751 needs to be started. The air pump 751 delivers compressed gas to the sealing joint 753 through the air duct adapter and flexible hose 752, allowing the compressed gas to enter the high-pressure oil pipe to be tested. Once the pressure inside the high-pressure oil pipe reaches the preset value, the air pump 751 stops supplying gas, and the testing device enters the pressure holding stage. Simultaneously, the external data acquisition system begins recording the pressure change data inside the oil pipe for test result determination. By using a low-frequency disturbance simulation working condition and simultaneous air tightness testing, the high-pressure oil pipe can be accurately tested under actual working conditions. To ensure reliable sealing and prevent static testing from failing to detect high-pressure oil pipe seal failures caused by low-frequency disturbances, as well as issues arising from significant discrepancies between the testing environment and actual working conditions, the coordinated action of the air pump 751, flexible hose 752, and sealing joint 753 enables stable delivery and sealing of compressed gas, guaranteeing the accuracy of airtightness testing. Furthermore, the flexible hose 752 accommodates minor displacements in the high-pressure oil pipe during low-frequency vibration testing, preventing loosening or detachment at the connection between the high-pressure oil pipe and the sealing joint 753 due to low-frequency vibrations or shaking during airtightness testing.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for testing the sealing reliability of high-pressure oil pipes under vibration load, characterized in that, include: A frame platform (1) with a clearance opening in the middle of the upper end is provided. Support frames (2) are provided on the left and right sides of the upper end of the frame platform (1). The support frames (2) are of the shape of a c. Several rectangular and evenly distributed bases (3) are installed on the upper end of the frame platform (1). A support plate (4) is installed on the frame platform (1) below the clearance opening. Uprights (5) are symmetrically installed on the upper end of the support plate (4). A vibration simulation part (6) is provided on the support plate (4) and the two uprights (5). A sealing detection part (7) for sealing test of high pressure oil pipe is provided on each base (3). Placement parts (8) for assisting in placing high pressure oil pipe are provided on the support frames (2) on both the left and right sides. The vibration simulation unit (6) includes a vibrator (61) installed on the upper end of the support plate (4). The vibrator (61) and the two left and right uprights (5) are jointly equipped with a mounting plate (62). The mounting plate (62) is composed of a U-shaped sleeve plate and a guide table with symmetrically opened cavities on the upper end. The upper end of the mounting plate (62) is connected to a bearing platform (63) by a support spring. The bearing platform (63) is a T-shaped structure. The lower end of the bearing platform (63) is symmetrically equipped with guide slide rods (64). The guide slide rods (64) are slidably connected to the inner wall of the corresponding cavities. An oil pipe fixing group (65) is provided on the bearing platform (63). The sealing detection unit (7) includes slide rails (71) symmetrically installed at the front and rear of the upper end of the base (3). The two slide rails (71) are slidably mounted with mounting slides (72). An adjusting screw (73) is also rotatably installed at the end of the base (3) away from the bearing platform (63). The adjusting screw (73) is threaded to the mounting slide (72). A handwheel (74) is installed at the end of the adjusting screw (73) away from the bearing platform (63). An airtightness detection group (75) is provided on the mounting slide (72).

2. The high-pressure oil pipe sealing reliability testing device under vibration load according to claim 1, characterized in that: The upper middle part of the vertical section of the bearing platform (63) is provided with a limiting groove (631), and the upper part of the vertical section of the bearing platform (63) is provided with symmetrical alignment grooves (632) on the left and right. Several slots (633) are evenly distributed in a circle on the inner wall of the alignment groove (632), and several spring dampers evenly distributed in a rectangle are also installed between the bearing platform (63) and the mounting plate (62).

3. The sealing reliability testing device for high-pressure oil pipes under vibration load according to claim 1, characterized in that: The placement part (8) includes a mounting plate (81) that is slidably installed on the inner wall of the support frame (2). A support slide rod (82) that slides through the support frame (2) is installed on the upper end of the mounting plate (81). A compression spring is sleeved on the outer wall of the support slide rod (82) between the support frame (2) and the mounting plate (81). The mounting plate (81) has symmetrical placement holes at one end facing the bearing platform (63). The placement holes are U-shaped. The upper end of the mounting plate (81) has symmetrical positioning grooves that are connected to the placement holes. A clamping slide (83) is slidably installed on the inner wall of the positioning groove through a compression spring. The upper end of the clamping slide (83) is a wedge-shaped structure. Electromagnets (84) are embedded at both ends of the mounting plate (81).

4. The sealing reliability testing device for high-pressure oil pipes under vibration load according to claim 1, characterized in that: The oil pipe fixing assembly (65) includes a positioning fixture 1 (651) installed at the upper end of the horizontal base plate of the bearing platform (63). There are several positioning fixtures 1 (651), and the several positioning fixtures 1 (651) are evenly distributed in a rectangular shape. The mounting slide plate (652) is slidably installed on the inner wall of the limiting slide groove (631) by compression spring. The upper end of the mounting slide plate (652) is equipped with a cover plate (653). The cover plate (653) is composed of a rectangular plate and two extension plates with pre-drilled circular sliding holes on the left and right. The lower end of the cover plate (653) is equipped with a positioning fixture 2 (658) through a connecting rod corresponding to several positioning fixtures 1 (651). The opposite ends of the positioning fixtures 1 (651) and positioning fixture 2 (658) are wedge-shaped structures with semi-circular grooves.

5. The high-pressure oil pipe sealing reliability testing device under vibration load according to claim 4, characterized in that: The oil pipe fixing assembly (65) also includes an alignment slide rod (654) that is movably arranged in the alignment groove (632) and the circular sliding hole. The alignment slide rod (654) is composed of a round rod and a cylinder. The lower end of the cylinder on the alignment slide rod (654) is rotatably connected to the cover plate (653). The lower side of the outer wall of the alignment slide rod (654) is provided with a mounting groove (655) corresponding to several slots (633). A snap-fit ​​slider (656) is slidably installed on the inner wall of the mounting groove (655) by a compression spring. The snap-fit ​​end of the snap-fit ​​slider (656) is rounded.

6. The high-pressure oil pipe sealing reliability testing device under vibration load according to claim 5, characterized in that: The oil pipe fixing assembly (65) also includes positioning magnets (657) embedded between the opposite ends of the cylinders on the cover plate (653) and the alignment slide bar (654). There are several positioning magnets (657), and the several positioning magnets (657) are evenly distributed around the circumference.

7. The sealing reliability testing device for high-pressure oil pipes under vibration load according to claim 1, characterized in that: The airtightness testing group (75) includes an air pump (751) installed at the end of the mounting slide (72) away from the support platform (63). An air duct adapter is installed at the end of the mounting slide (72) facing the support platform (63) through an opening. The air pump (751) is connected to a flexible hose (752) through the air duct adapter. A sealing joint (753) is connected at the end of the flexible hose (752) away from the air pump (751). A bracket (754) for placing and fixing the flexible hose (752) is installed at the upper end of the mounting slide (72).

Images