Vibration fatigue test device for high-pressure common rail system of dual-fuel engine

Abstract

The invention discloses a vibration fatigue test device for a high-pressure common rail system of a dual-fuel engine in the technical field of dual-fuel engine part test, which comprises vibration equipment, a vibration table arranged at the output end of the vibration equipment, a positioning assembly, a testing assembly and a testing assembly, the fixing device is used for fixing a to-be-tested high-pressure common rail system on a vibration table. And the monitoring assembly comprises a frame which is connected with the vibration equipment and is located above the vibration table, and a plurality of groups of separated monitoring parts which are arranged on the frame in a sliding manner. According to the invention, when the vibration equipment carries out a vibration test on the high-pressure common rail system, the high-pressure common rail system is monitored in real time through the separated monitoring part in the monitoring assembly, and the strain gauge in the separated monitoring part is clamped and fixed on the high-pressure common rail system along with the supporting frame, the second clamping piece and the telescopic piece. The mode does not need to spend a lot of time for manpower to disassemble and assemble the monitoring element on the high-pressure common rail system, and the surface of the measured piece is not prone to being damaged.

Description

Technical Field

[0001] This invention relates to the field of dual-fuel engine component testing, specifically to a vibration fatigue testing device for a high-pressure common rail system of a dual-fuel engine. Background Technology

[0002] Currently, dual-fuel engines are the core equipment of marine power systems, capable of using diesel and natural gas simultaneously or alternately. The high-pressure common rail system, as a key subsystem, achieves precise fuel injection through the coordinated work of components such as filters, high-pressure pumps, common rail pipes, and injectors. Its reliability directly affects engine emission performance and operational safety. However, vibrations generated during ship operation can easily lead to weld cracks, seal failures, and other malfunctions in the high-pressure common rail system. Therefore, after the high-pressure common rail system is manufactured, its reliability needs to be verified by a vibration fatigue testing device.

[0003] Traditional vibration fatigue testing devices for high-pressure common rail systems mostly rely on manual bonding of monitoring elements (such as strain gauges) to the system to monitor deformation. However, this method is cumbersome, requiring significant manual time for both bonding and removal, and is prone to damaging the surface of the tested components. Furthermore, it hinders the detection of leaks in the high-pressure common rail system after vibration testing, often necessitating the use of separate equipment for subsequent leak checks, thus limiting its effectiveness. Therefore, we propose a vibration fatigue testing device for a dual-fuel engine high-pressure common rail system. Summary of the Invention

[0004] The purpose of this invention is to provide a vibration fatigue testing device for a dual-fuel engine high-pressure common rail system. This device solves the problem that existing high-pressure common rail system vibration fatigue testing devices mostly rely on manually attaching monitoring elements to the high-pressure common rail system to monitor its deformation. However, this method not only requires a lot of manual time to attach the monitoring elements, but also requires a lot of manual time to remove them later, making it cumbersome and greatly reducing work efficiency. Furthermore, the removal process can easily damage the surface of the tested component.

[0005] The present invention achieves the above objectives through the following technical solutions: A vibration fatigue testing apparatus for a dual-fuel engine high-pressure common rail system includes a vibration device and a vibration table located at the output end of the vibration device. The vibration fatigue testing apparatus further includes: Positioning components are used to secure the high-pressure common rail system to be tested onto the vibration table; The monitoring component includes a frame frame connected to the vibration equipment and located above the vibration table, and several sets of detachable monitoring units slidably disposed on the frame frame; wherein the detachable monitoring unit includes a first telescopic device, a support frame detachably connected to the output end of the first telescopic device, a second clamping member symmetrically slidably disposed on one side of the support frame and used for contacting the high-pressure common rail system, and a telescopic member disposed on the support frame for driving the two second clamping members to move, wherein the second clamping member is embedded with a strain gauge for contacting the outer wall of the high-pressure common rail system.

[0006] A further improvement is that the output end of the first telescopic device is provided with an electromagnetic block, and the support frame is provided with a magnetic connector that is attracted and connected to the energized electromagnetic block.

[0007] A further improvement is that sliding openings are provided on both sides of the support frame, and the telescopic component includes a second telescopic device respectively provided in the two sets of sliding openings, a connecting block provided at the output end of the second telescopic device and detachably fixedly connected to the second clamping component on the same side, and a damping block provided between the connecting block and the second clamping component.

[0008] A further improvement is that the second clamping member has a groove embedded in the side wall facing the high-pressure common rail system for accommodating the strain gauge, and the depth of the groove is less than the thickness of the strain gauge.

[0009] A further improvement is that the second clamping member is also provided with a detection sensor group, which includes an acceleration sensor and a leakage detection sensor. The acceleration sensor, the leakage detection sensor and the strain gauge are all electrically connected to external detection equipment.

[0010] A further improvement is that a sliding opening is provided on the frame along its length, and several sets of bearing sliders are provided in the sliding opening. Among them, some bearing sliders are provided with separate monitoring parts, and other bearing sliders are provided with displacement sensors for monitoring the displacement of the high-pressure common rail system. The displacement sensors are electrically connected to external detection equipment.

[0011] A further improvement is that the frame is connected to a base via a bracket, the base is located at the bottom of the vibration device, the base is equipped with a liquid supply pump, the input end of the liquid supply pump is connected to a connector via a hose, the connector is used for detachable connection with the input end of the high-pressure common rail system, the output end of the liquid supply pump is connected to a device for supplying detection liquid, and the vibration table is equipped with a sealing part for sealing the output end of the high-pressure common rail system. The detection liquid is prepared by mixing a fluorescent agent, peppermint oil and isopropanol, and the weight ratio of the components of the detection liquid is: fluorescent agent - part, peppermint oil - part and isopropanol - part.

[0012] A further improvement is that the sealing part includes a sealing plate that is slidably disposed on the vibration table for sealing the output end of the high-pressure common rail system. The sealing plate is provided with a pin, and the vibration table is provided with a number of blind holes for the pin to be inserted.

[0013] A further improvement is that the monitoring component also includes an electric guide rail assembly located on one side of the frame and extending along the length of the frame. The slider of the electric guide rail assembly is equipped with an image acquisition device for acquiring image data of the high-voltage common rail system. The image acquisition device is electrically connected to an external detection device and includes an industrial camera and an ultraviolet LED light source.

[0014] A further improvement is that the positioning assembly includes bidirectional screws symmetrically rotated on both sides of the top of the vibration table, a drive unit on the vibration table for driving the two bidirectional screws to rotate synchronously, and two sets of assembly plates respectively threaded onto the two ends of the two bidirectional screws. Several sets of mounting screws are inserted into the assembly plates, and the assembly plates are evenly provided with openings for the mounting screws to pass through. One end of the mounting screw is provided with a first clamping member for contacting the high-pressure common rail system, and the other end is fixed to the assembly plate by two locking nuts.

[0015] A further improvement is that both the first clamping member and the second clamping member include an arc-shaped clamping member, a U-shaped clamping member, or a rectangular clamping member.

[0016] The beneficial effects of this invention are as follows: This invention uses a positioning component to fix the high-pressure common rail system on a vibration table. During vibration testing of the high-pressure common rail system, a separate monitoring unit in the monitoring component monitors the system in real time. The strain gauges in the separate monitoring unit are clamped and fixed to the high-pressure common rail system along with the support frame, the second clamping component, and the telescopic component. This method eliminates the need for manual time spent disassembling and assembling monitoring components on the high-pressure common rail system and is less likely to damage the surface of the tested component, thus facilitating reliability assessment of the high-pressure common rail system. Furthermore, after the vibration test, this invention allows for leak detection of the high-pressure common rail system using sensors for detecting liquids, sealing parts, leaks, and image acquisition, improving the applicability of the vibration fatigue testing device and benefiting subsequent maintenance and high-pressure common rail system design. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the vibration fatigue testing device of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of a partial structure; Figure 3 For the present invention Figure 2 Another perspective structural diagram; Figure 4This is a schematic diagram of the monitoring component structure of the present invention; Figure 5 This is a schematic diagram of the detachable monitoring unit structure of the present invention; Figure 6 For the present invention Figure 4 An enlarged schematic diagram of structure A in the image.

[0018] In the diagram: 1. Vibration equipment; 2. Vibration table; 3. Positioning assembly; 31. Bidirectional screw; 32. Assembly plate; 33. Mounting screw; 34. Locking nut; 35. First clamping component; 4. High-pressure common rail system; 41. Filter; 42. Pump body; 43. Common rail pipe; 44. Injector; 5. Monitoring assembly; 51. Bracket; 52. Base; 53. Frame; 54. Load-bearing slider; 55. Separate monitoring unit; 551. First clamping component. 552. Telescopic device; 553. Magnetic connector; 554. Support frame; 555. Connecting block; 556. Second telescopic device; 557. Second clamping component; 558. Damping block; 559. Strain gauge; 5510. Accelerometer; 5510. Leakage detection sensor; 56. Displacement sensor; 57. Electric guide rail assembly; 58. Liquid supply pump; 59. Connector; 510. Sealing plate; 511. Pin; 512. Image acquisition device. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Example 1 Please see the appendix Figure 1-6 A vibration fatigue testing device for a dual-fuel engine high-pressure common rail system includes a vibration device 1 and a vibration table 2 located at the output end of the vibration device 1. The vibration device 1 is used to simulate a mechanical vibration environment to test the reliability of the high-pressure common rail system 4. Optionally, the vibration table 2 is a rigid aluminum alloy platform and is rigidly connected to the output shaft of the vibration device 1 by bolts. The high-pressure common rail system 4 for dual-fuel engines is a conventional component in dual-fuel engines in this field, as shown in the attached diagram. Figure 2 As shown, the current dual-fuel engine high-pressure common rail system 4 typically includes a filter 41, a pump body 42 connected to the filter 41 via a pipeline, a common rail pipe 43 connected to the pump body 42 via a pipeline, and several injectors 44 connected to the common rail pipe 43, which will not be described in detail here. The vibration fatigue testing device also includes: Positioning component 3 is used to fix the high-pressure common rail system 4 to be tested on the vibration table 2. Positioning component 3 serves two purposes: firstly, to install the high-pressure common rail system 4, and secondly, to transmit the vibration force to the high-pressure common rail system 4 when the vibration equipment 1 causes the vibration table 2 to vibrate, thereby realizing the vibration fatigue test of the high-pressure common rail system 4. The monitoring component 5 includes a frame 53 connected to the vibration device 1 and located above the vibration table 2. The frame 53 is independent of the vibration table 2, that is, the vibration of the vibration table 2 will not affect the vibration of the frame 53. It also includes several sets of separate monitoring units 55 that are slidably mounted on the frame 53. The detachable monitoring unit 55 includes a first telescopic device 551 (such as an electric telescopic rod), a support frame 553 detachably connected to the output end of the first telescopic device 551, second clamping members 556 symmetrically slidably disposed on one side of the support frame 553 for contacting the high-pressure common rail system 4, and telescopic members disposed on the support frame 553 for driving the two second clamping members 556 to move. Through the above method, after the positioning assembly 3 fixes the high-pressure common rail system 4 onto the vibration table 2, the monitoring unit monitors the position of various parts of the high-pressure common rail system 4 (such as the common rail pipe 43, pump body 42, and filter). 41 and the pipelines between various parts) flexibly adjust the position of the separate monitoring unit 55. After adjustment, the support frame 553 is driven downward by the first telescopic device 551. Then, the two second clamping parts 556 are driven to approach and contact the high-pressure common rail system 4 through the telescopic parts, and then clamped on the outer wall of each part of the high-pressure common rail system 4. Then, the first telescopic device 551 rises and separates from the support frame 553. When the high-pressure common rail system 4 vibrates, the second clamping parts 556 clamped on the outer wall of each part of the high-pressure common rail system 4 vibrate with it, and the real vibration state of the high-pressure common rail system 4 is detected in real time. The second clamping member 556 is embedded with a strain gauge 558 for contacting the outer wall of the high-pressure common rail system 4. The strain gauge 558 is a conventional testing component in this field. The strain gauge 558 can monitor the micro-strain of the outer wall of the system in real time during the vibration fatigue test of the high-pressure common rail system 4, and can accurately capture the dynamic deformation of key parts such as the common rail pipe 43 and pipelines under vibration load.

[0021] Please see the appendix Figure 1-2In embodiments 4-6, preferably, the output end of the first telescopic device 551 in this embodiment is provided with an electromagnetic block, and the support frame 553 is provided with a magnetic connector 552 that is attracted and connected to the energized electromagnetic block. The first telescopic device 551 and the support frame 553 can be quickly connected and separated through electromagnetic attraction. In this way, after the second clamping member 556 clamps the high-pressure common rail system 4, the first telescopic device 551 can be separated from the support frame 553 by de-energizing the electromagnetic block. This effectively isolates vibration transmission and protects the first telescopic device 551. After the test, the support frame 553 can be quickly reset and separated from the high-pressure common rail system 4 by energizing and attracting. This improves the work efficiency of large-scale fatigue testing of the high-pressure common rail system 4. Furthermore, since the two are magnetically connected, the angle of the support frame 553 can be adjusted at the beginning so that the second clamping member 556 can be clamped on the common rail pipe 43, the outer wall of the pipe, or the outer wall of the pump body 42 of the high-pressure common rail system 4.

[0022] Please see the appendix Figure 4-6 Preferably, the support frame 553 in this embodiment has sliding openings on both sides. The telescopic component includes a second telescopic device 555 (such as an electric telescopic rod) respectively disposed in the two sets of sliding openings, a connecting block 554 disposed at the output end of the second telescopic device 555 and detachably fixedly connected to the second clamping member 556 on the same side, and a damping block 557 disposed between the connecting block 554 and the second clamping member 556. The damping block 557 can be a rubber damping block. The connecting block 554 and the second clamping member 556 can be detachably connected by bolts or other components. The second telescopic device 555 can drive the two sets of second clamping members 556 to move closer or further away from each other, thereby clamping the two sets of second clamping members 556 on the outer wall of the high-pressure common rail system 4 or releasing them. The damping block 557 can reduce the vibration force transmitted from the second clamping member 556 to the connecting block 554 and the second telescopic device 555, thereby extending the service life of the second telescopic device 555.

[0023] Preferably, in this embodiment, the second clamping member 556 has a groove embedded in the side wall facing the high-pressure common rail system 4 for accommodating the strain gauge 558, and the depth of the groove is less than the thickness of the strain gauge 558. This method facilitates the installation of the strain gauge 558 and ensures that the strain gauge 558 fits tightly against the outer wall of the high-pressure common rail system 4. Compared with the traditional method of bonding the strain gauge 558 to the test piece, this device has high installation efficiency, is easy to remove later, will not affect the later use of the test piece, and also ensures testing efficiency and measurement accuracy.

[0024] Preferably, the second clamping member 556 in this embodiment is also provided with a detection sensor group, which includes an acceleration sensor 559 and a leakage detection sensor 5510. The acceleration sensor 559, the leakage detection sensor 5510 and the strain gauge 558 are all electrically connected to external detection equipment. Optionally, this external detection device may include, for example, a receiving module for receiving detection data transmitted by the accelerometer 559, the leak detection sensor 5510, and the strain gauge 558; The comparison module is used to compare the detection data with a preset safety threshold (set by the operator in advance) to obtain the comparison result; The display module is used to display detection data and comparison results; The control module is used to receive the comparison results and issue control signals based on the comparison results; The early warning module is used to receive control signals from the control module to warn users when the comparison result shows that the detection data exceeds a preset threshold. Of course, the external testing equipment used in this application is not limited to the one mentioned above; This device uses an accelerometer 559, a leak detection sensor 5510, and a strain gauge 558 to perform real-time monitoring and early warning of abnormalities in the vibration test of the high-pressure common rail system 4, thereby improving the quality of the vibration fatigue test of the high-pressure common rail system 4.

[0025] Preferably, in this embodiment, a sliding opening is provided on the frame 53 along its length. Several sets of bearing sliders 54 are provided in the sliding opening. Among them, some bearing sliders 54 are provided with separate monitoring parts 55, and other bearing sliders 54 are provided with displacement sensors 56 for monitoring the displacement of the high-pressure common rail system 4. The displacement sensors 56 are electrically connected to external detection equipment. By setting the separate monitoring parts 55 and displacement sensors 56 on the bearing sliders 54, the positions of the separate monitoring parts 55 and displacement sensors 56 can be flexibly adjusted to achieve full-area coverage detection of the high-pressure common rail system 4 during the vibration test. The displacement sensors 56 are used to monitor the dynamic displacement changes of the high-pressure common rail system 4 in real time during the vibration test, accurately capture the vibration amplitude and deformation trajectory of each part of the system, and provide key experimental basis for optimizing the vibration-resistant design of the high-pressure common rail system 4.

[0026] Example 2 Please see the appendix Figure 1-3Based on Embodiment 1, in this embodiment, the frame 53 is connected to the base 52 via the bracket 51. The base 52 is located at the bottom of the vibration device 1. The base 52 is equipped with a liquid supply pump 58. The input end of the liquid supply pump 58 is connected to a connector 59 via a hose. The connector 59 is used for detachable connection with the input end of the high-pressure common rail system 4 (the connector 59 is specifically connected to the input end of the filter 41 of the high-pressure common rail system 4, and can be detachable by means of buckles or bolts). The output end of the liquid supply pump 58 is connected to a device for supplying the test liquid. Optionally, the device may include, for example, a box for storing the test liquid. The vibration table 2 is provided with a sealing part for sealing the output end of the high-pressure common rail system 4 (the sealing part specifically seals the output end of the injector 44 of the high-pressure common rail system 4) so ​​that the test liquid will not be sprayed out from the injector 44. The detection liquid is prepared by mixing a fluorescent agent, peppermint oil and isopropanol. The weight ratio of the components in the detection liquid is as follows: 80-90 parts of fluorescent agent, 0.5-1 part of peppermint oil and 0.5-1 part of isopropanol. Optionally, the fluorescent agent in this embodiment may be a liquid fluorescent tracer. The fluorescent tracer usually appears yellow-green or orange under natural light (the specific color depends on the formulation, such as sodium fluorescein, which is bright yellow and emits high-intensity fluorescence (such as green, red, etc.) under ultraviolet light). The peppermint oil can be food-grade peppermint oil. Peppermint oil has a certain odor that can be identified by the leak detection sensor 5510. Specifically, the peppermint oil odor data can be pre-stored in the external detection equipment and compared with the data collected by the leak detection sensor 5510 for identification and judgment. Medical grade isopropanol can be used to ensure the chemical stability of the test liquid. The above-mentioned detection liquid is prepared by mixing fluorescent agent, peppermint oil and isopropanol in a reaction vessel at a controlled temperature of 40±2℃ and a rotation speed of 200rpm for 30 minutes.

[0027] After the vibration test of the high-pressure common rail system 4 is completed, the connector 59 is connected to the input end of the filter 41 of the high-pressure common rail system 4, the output end of the injector 44 is sealed by the sealing part, and the test liquid is pumped into the high-pressure common rail system 4 by the liquid supply pump 58. If the high-pressure common rail system 4 leaks due to the vibration test, the test liquid will seep out from the leak location, and the leak detection sensor 5510 will collect the odor data of the test liquid and send it to the external detection equipment. At the same time, the user can observe the leak location of the high-pressure common rail system 4 according to the test liquid. After the test, the user can extract the liquid in the high-pressure common rail system 4 from the external pipe at the input end of the filter 41 of the high-pressure common rail system 4, and after the high-pressure common rail system 4 is removed, cleaning fluid is delivered from the input end of its filter 41 to remove the residual test liquid in the high-pressure common rail system 4.

[0028] Preferably, the sealing part in this embodiment includes a sealing plate 510 slidably disposed on the vibration table 2 for sealing the output end of the high-pressure common rail system 4. The sealing plate 510 is provided with a pin 511, and the vibration table 2 has several sets of blind holes for the pin 511 to be inserted. During the vibration test of the high-pressure common rail system 4, the sealing plate 510 and the output end of the injector 44 of the high-pressure common rail system 4 (attached) are closed. Figure 2 The bottom of the injector 44 is shown to be separated to avoid interfering with the vibration test of the high-pressure common rail system 4. After the vibration test, the operator can push the sealing plate 510 to the bottom of the output end of the injector 44 to seal the injector 44. Then, the sealing plate 510 is fixed by the pin 511 engaging with the corresponding blind hole on the vibration table 2. This method makes it convenient to detect whether there is any leakage in the high-pressure common rail system 4 after the vibration test.

[0029] Preferably, the monitoring component 5 in this embodiment also includes an electric guide rail assembly 57 disposed on one side of the frame 53 and extending along the length of the frame 53. The electric guide rail assembly 57 is a conventional device in the art, including a slide rail, a slider, and a drive structure, etc., which will not be described in detail here. The slider of the electric guide rail assembly 57 is provided with an image acquisition device 512 for collecting image data of the high-pressure common rail system 4. The image acquisition device 512 is connected to an external detection device by telecommunications. The image acquisition device 512 includes an industrial camera and an ultraviolet LED light source. In this embodiment, the detection liquid is excited by the ultraviolet LED light source, and the image data is collected in real time by the industrial camera. This makes it convenient for later operators to confirm the leakage location of the high-pressure common rail system 4 based on the collected image data (such as the presence of detection liquid in a certain part of the high-pressure common rail system 4 in the image data), which is beneficial for later maintenance and the design of the high-pressure common rail system 4.

[0030] Example 3 Please see the appendix Figure 1-3 Based on Embodiment 1, the positioning component 3 of this embodiment includes bidirectional screws 31 symmetrically rotatably disposed on both sides of the top of the vibration table 2 (optionally, the bidirectional screws 31 are connected to the vibration table 2 using bearing seats, but this is not limited to this method), a driving part disposed on the vibration table 2 for driving the two bidirectional screws 31 to rotate synchronously (optionally, the driving part includes a driving handwheel rotatably disposed on the vibration table 2 and a sprocket and chain assembly that drives the driving handwheel and the two bidirectional screws 31 to rotate synchronously, but this is not limited to this method), and two sets of mounting plates 32 respectively threaded onto both ends of the two bidirectional screws 31, such as... Figure 1As shown, the vertical cross-section of the assembly plate 32 is U-shaped, which does not affect the installation of the high-pressure common rail system 4 and does not interfere with the positioning of the high-pressure common rail system 4. Several sets of mounting screws 33 are inserted on the assembly plate 32. The number of mounting screws 33 can be selected according to the needs of use. The assembly plate 32 has evenly distributed openings for the mounting screws 33 to pass through. Multiple openings are provided to facilitate the adjustment of the position of the mounting screws 33. One end of the mounting screw 33 is provided with a first clamping member 35 for contacting the high-pressure common rail system 4, and the other end is fixed to the assembly plate 32 by two locking nuts 34. The operator can flexibly adjust the position of the mounting screws 33 on the assembly plate 32 according to the position of various parts of the high-pressure common rail system 4 to be tested, such as the common rail pipe 43, pump body 42, filter 41, etc. During positioning, the two bidirectional screws 31 are driven to rotate synchronously by the drive unit, which drives the two assembly plates 32 to move closer to each other. The high-pressure common rail system 4 to be tested can be fixed on the vibration table 2 by using the mounting screws 33 and the first clamping member 35.

[0031] Preferably, the first clamping member 35 and the second clamping member 556 in this embodiment both include an arc-shaped clamping member, a U-shaped clamping member, or a rectangular clamping member. The arc-shaped clamping member is used to adapt to the clamping and positioning of parts such as the common rail pipe 43 and the filter 41 in the high-pressure common rail system 4, while the U-shaped clamping member and the rectangular clamping member are used to adapt to the clamping and positioning of parts such as the pump body 42.

[0032] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A vibration fatigue testing device for a dual-fuel engine high-pressure common rail system, comprising a vibration device (1) and a vibration table (2) disposed at the output end of the vibration device (1), characterized in that, The vibration fatigue testing device also includes: Positioning component (3) is used to fix the high-pressure common rail system (4) to be tested on the vibration table (2); The monitoring component (5) includes a frame (53) connected to the vibration device (1) and located above the vibration table (2), and several sets of detachable monitoring units (55) slidably disposed on the frame (53); wherein the detachable monitoring unit (55) includes a first telescopic device (551), a support frame (553) detachably connected to the output end of the first telescopic device (551), a second clamping member (556) symmetrically slidably disposed on one side of the support frame (553) and used to contact the high-pressure common rail system (4), and a telescopic member disposed on the support frame (553) for driving the two second clamping members (556) to move, wherein the second clamping member (556) is embedded with a strain gauge (558) for contacting the outer wall of the high-pressure common rail system (4).

2. The vibration fatigue testing apparatus according to claim 1, characterized in that, The output end of the first telescopic device (551) is provided with an electromagnetic block, and the support frame (553) is provided with a magnetic connector (552) that is attracted and connected to the energized electromagnetic block.

3. The vibration fatigue testing apparatus according to claim 1, characterized in that, The support frame (553) has sliding openings on both sides. The telescopic component includes a second telescopic device (555) respectively located in the two sets of sliding openings, a connecting block (554) located at the output end of the second telescopic device (555) and detachably fixedly connected to the second clamping component (556) on the same side, and a damping block (557) is provided between the connecting block (554) and the second clamping component (556).

4. The vibration fatigue testing apparatus according to claim 1, characterized in that, The second clamping member (556) has a groove embedded on the side of its surface facing the high-pressure common rail system (4) for accommodating the strain gauge (558), and the depth of the groove is less than the thickness of the strain gauge (558).

5. The vibration fatigue testing apparatus according to claim 1, characterized in that, The second clamping member (556) is also provided with a detection sensor group, which includes an acceleration sensor (559) and a leakage detection sensor (5510). The acceleration sensor (559), the leakage detection sensor (5510) and the strain gauge (558) are all electrically connected to external detection equipment.

6. The vibration fatigue testing apparatus according to claim 1, characterized in that, A sliding opening is provided on the frame (53) along its length direction. Several sets of bearing sliders (54) are provided in the sliding opening. Among them, a part of the bearing sliders (54) are provided with a separate monitoring part (55), and another part of the bearing sliders (54) are also provided with a displacement sensor (56) for monitoring the displacement of the high-pressure common rail system (4). The displacement sensor (56) is electrically connected to an external detection device.

7. The vibration fatigue testing apparatus according to claim 1, characterized in that, The frame (53) is connected to a base (52) via a bracket (51). The base (52) is located at the bottom of the vibration device (1). A liquid supply pump (58) is provided on the base (52). The input end of the liquid supply pump (58) is connected to a connector (59) via a hose. The connector (59) is used to detachably connect to the input end of the high-pressure common rail system (4). The output end of the liquid supply pump (58) is connected to a device for supplying detection liquid. The vibration table (2) is provided with a sealing part for sealing the output end of the high-pressure common rail system (4). The detection liquid is prepared by mixing a fluorescent agent, peppermint oil and isopropanol, and the weight ratio of the components of the detection liquid is: 80-90 parts of fluorescent agent, 0.5-1 part of peppermint oil and 0.5-1 part of isopropanol.

8. The vibration fatigue testing apparatus according to claim 7, characterized in that, The sealing part includes a sealing plate (510) that is slidably disposed on the vibration table (2) for sealing the output end of the high-pressure common rail system (4). The sealing plate (510) is provided with a pin (511), and the vibration table (2) is provided with several sets of blind holes for the pin (511) to be inserted.

9. The vibration fatigue testing apparatus according to claim 7, characterized in that, The monitoring component (5) also includes an electric guide rail assembly (57) located on one side of the frame (53) and extending along the length of the frame (53). The slider of the electric guide rail assembly (57) is provided with an image acquisition device (512) for acquiring image data of the high-voltage common rail system (4). The image acquisition device (512) is electrically connected to an external detection device. The image acquisition device (512) includes an industrial camera and an ultraviolet LED light source.

10. The vibration fatigue testing apparatus according to claim 1, characterized in that, The positioning component (3) includes bidirectional screws (31) symmetrically rotated on both sides of the top of the vibration table (2), a drive unit on the vibration table (2) for driving the two bidirectional screws (31) to rotate synchronously, and two sets of assembly plates (32) respectively threaded onto the two ends of the two bidirectional screws (31). Several sets of mounting screws (33) are inserted on the assembly plate (32). The assembly plate (32) has evenly opened openings for the mounting screws (33) to pass through. One end of the mounting screw (33) is provided with a first clamping member (35) for contacting the high-pressure common rail system (4), and the other end is fixed to the assembly plate (32) by two locking nuts (34).

11. The vibration fatigue testing apparatus according to claim 10, characterized in that, The first clamping member (35) and the second clamping member (556) both include an arc-shaped clamping member, a U-shaped clamping member, or a rectangular clamping member.

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