Hydrogen storage cylinder corrosion resistance and air tightness detection equipment

Abstract

The invention discloses hydrogen storage cylinder corrosion resistance and air tightness detection equipment, and relates to the technical field of hydrogen cylinder detection, the hydrogen storage cylinder corrosion resistance and air tightness detection equipment comprises an environmental chamber, a control assembly and a collision assembly, and one side of the environmental chamber is provided with a freely opened and closed chamber door; and the control assembly comprises a telescopic mechanism for sealing and protecting the bottle body and a rotating mechanism for controlling the positioning of the bottle body. According to the invention, the control assembly and the external air pump are arranged to circularly inflate and deflate the hydrogen cylinder, so that the corrosion-resistant fatigue life test of the hydrogen cylinder is realized; by arranging the collision assembly, the weak points of the bottle body are collided to complete the mechanical impact test; by designing a detection process, adding a control group and a reference group, the change trend of impact energy and life attenuation of the hydrogen cylinder is analyzed, and then the residual service life of the hydrogen cylinder subjected to impact is predicted.

Description

Technical Field

[0001] This invention relates to the field of hydrogen cylinder testing technology, specifically to a device for testing the corrosion resistance and airtightness of hydrogen storage cylinders. Background Technology

[0002] Hydrogen storage cylinders can be categorized into vehicle-mounted, stationary, and portable types based on their application. Vehicle-mounted cylinders require high operating pressure, long fatigue life, and lightweight construction. Therefore, corrosion resistance and airtightness testing of hydrogen storage cylinders are crucial for ensuring their long-term safe and reliable operation. Given the small particle size and high permeability of hydrogen molecules, and their susceptibility to hydrogen embrittlement and chemical aging reactions with materials, testing can effectively prevent high-pressure hydrogen leakage and the resulting risk of combustion and explosion. This testing is not only a necessary measure to ensure the structural integrity of hydrogen storage containers throughout their entire lifespan but also a vital technical guarantee for the safe operation of hydrogen energy equipment.

[0003] A search revealed Chinese patent CN119104483A, which includes a test bench and a protective assembly; the protective assembly is connected to the test bench. This invention achieves the following: First limiting part restricts debris flow, preventing it from being carried by hydrogen into the second gas pump. Simultaneously, second limiting part similarly prevents debris from being carried by hydrogen into the second gas pump, improving the debris collection efficiency of the aforementioned debris collection location. Furthermore, a guiding surface guides hydrogen away from the angle between the guide plate and the second baffle, preventing hydrogen flow from affecting debris collection and preventing debris from being carried by hydrogen into the second gas pump, thus avoiding blockage and affecting the subsequent collection of leaked hydrogen.

[0004] However, the aforementioned method for testing high-pressure hydrogen cylinders by impact, even with the use of isolation rods and partitions to shield the heating surface, cannot completely eliminate the risk of hydrogen explosion, thus failing to meet safety monitoring principles. Furthermore, this method struggles to pinpoint the impact point as the cylinder's weak point, requiring additional cylinder strength testing before impact testing, making the process cumbersome. Moreover, the impact force of this method is difficult to adjust, making it impossible to determine the maximum impact force the cylinder can withstand before its weak point breaks, hindering the establishment of a relationship between mechanical impact testing and corrosion fatigue life testing, and increasing the risk of distorted data results. Summary of the Invention

[0005] The purpose of this invention is to provide a device for testing the corrosion resistance and airtightness of hydrogen storage cylinders, which has the advantages of safety testing and variable analysis, and solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hydrogen storage cylinder corrosion resistance and airtightness testing device, including an environmental chamber, a control component, and an impact component. The environmental chamber is provided with a freely opening and closing door on one side. The control component includes a telescopic mechanism for sealing and protecting the cylinder and a rotating mechanism for controlling the positioning of the cylinder. The telescopic mechanism includes a base fixedly connected to the bottom of the interior of the environmental chamber, and the rotating mechanism includes a drive ring that is pulsatorically connected to the telescopic mechanism. The impact assembly includes a fixed bracket that is fixedly connected to the bottom of the environmental chamber near the base.

[0007] Preferably, a dual-axis motor is fixedly connected to the middle section of the top of the base, and a sliding groove is opened on the upper surface of the base along its long side. Sliding seats are limited and connected at both sides of the dual-axis motor in the sliding groove. Both ends of the dual-axis motor are provided with lead screws as its output shafts, and both lead screws pass through and are screwed to the corresponding sliding seats.

[0008] Preferably, both lead screws are individually controlled by a dual-axis motor, and the rotation state and direction between the two lead screws can be freely adjusted.

[0009] Preferably, the telescopic mechanism includes a drive ring that passes through and is rotatably connected to the top of the dual-axis motor. Both ends of the drive ring pass through corresponding sliding seats. Both ends of the drive ring are penetrated by splined shafts. The drive ring and the splined shafts are connected by a spline engagement to achieve a transmission connection. The splined shafts can extend and retract along the axial direction of the drive ring. Both splined shafts pass through and are rotatably connected to the corresponding sliding seats. The ends of the two splined shafts away from the drive ring are fixedly connected to a transmission wheel. The top ends of the outer contours of the two transmission wheels are meshed with positioning wheels. Enclosed chambers are fixedly connected to the opposite surfaces of the two positioning wheels.

[0010] Preferably, a fixing ring is fixedly connected through the center of each of the two positioning wheels, and the two fixing rings also penetrate the corresponding closed chambers. An acoustic emission sensor array is provided on the inner wall of each of the two closed chambers. A limiting ring is fixedly connected to the outer contour of each of the two fixing rings at the inner end of the closed chamber. A compression spring is fixedly connected to the end of each of the two limiting rings pointing to the corresponding position inside the closed chamber. A compression plate is fixedly connected to the end of each of the two compression springs away from the limiting rings. The same hydrogen cylinder is jointly abutted and locked onto the opposite surfaces of the two compression plates.

[0011] Preferably, the ends of the two limiting rings pointing to the corresponding extrusion plates are slidably connected with spline rings, the two compression springs are connected to the corresponding limiting rings via spline engagement, and the ends of the two spline rings away from the limiting rings are fixedly connected to the corresponding extrusion plates. An air duct is provided on the inner contour of the spline ring near the hatch side, and the other end of the air duct extends out of the environment chamber and is connected to an air pump.

[0012] Preferably, a drive roller driven by a built-in motor is rotatably connected through the middle section of the fixed frame. A spline pin is fixedly connected to the outer surface of one side of the drive roller, and a clearance groove is formed on the outer surface of the other side of the drive roller. A positioning shaft passes through the middle section of the clearance groove, and the positioning shaft also passes through the drive roller. The two ends of the positioning shaft extend into the clearance groove and pass through the same sway ring. The surface of the sway ring has a clearance groove two that matches the clearance groove one. The sway ring is sleeved on the outer contour of the drive roller at the position of the clearance groove one. A transmission rod is driven to one side of the clearance groove two through a pin, and a sliding ring one is driven to the other end of the transmission rod through a pin. A sliding ring two is fixedly connected to the side of the sliding ring one away from the transmission rod. Both the sliding ring one and the sliding ring two are sleeved through the outer contour of the drive roller at the position of the spline pin. The sliding ring one and the sliding ring two are driven to the drive roller through the spline pin.

[0013] Preferably, the top of the fixed frame is slidably connected to an impact rod, the middle section of the impact rod is driven to a ball joint connecting rod, the bottom end of the ball joint connecting rod is driven to engage the inner contour of the oscillating ring, the end of the impact rod pointing towards the hydrogen cylinder is fixedly connected to an impact head, a helium mass spectrometer is installed on the outer wall of the fixed frame near the impact head, a threaded shaft is threaded through and screwed onto the outer contour of the fixed frame away from the impact head, one end of the threaded shaft extends toward the first sliding ring and is fixedly connected to a guide seat, the guide seat is engaged between the first sliding ring and the second sliding ring.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention achieves corrosion fatigue life testing of hydrogen cylinders by setting up control components and connecting an external gas pump to circulate and release gas in the hydrogen cylinders. At the same time, it automatically draws a damage evolution diagram of the cylinder body during the test, thereby locating the weak points in the structural strength of the cylinder body and further controlling the position of the cylinder body so that the weak points are aligned with the impact components, so as to facilitate subsequent mechanical impact testing.

[0015] 2. This invention uses an impact component to perform a mechanical impact test by impacting the weak points of the cylinder body. The impact force can be freely adjusted, thereby testing whether the maximum impact strength that the weak points of the hydrogen cylinder structure can withstand reaches the safety threshold.

[0016] 3. This invention designs a testing process, adds a control group and a benchmark group, and tests the changes in the fatigue life of hydrogen cylinders under different impact forces. It analyzes the changing trend of the impact energy and life decay of hydrogen cylinders, and then predicts the remaining service life of hydrogen cylinders under impact. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a cross-sectional view of the main structure of the present invention; Figure 3 This is a schematic diagram of the telescopic mechanism of the present invention; Figure 4 This is a schematic diagram of the rotating mechanism of the present invention; Figure 5 This is a partial cross-sectional view of the control component of the present invention; Figure 6 This is a cross-sectional view of the impact component of the present invention; Figure 7 This is a schematic diagram of the impact component of the present invention; Figure 8 This is a flowchart illustrating the overall workflow of the present invention. In the diagram: 1. Environmental chamber; 2. Base; 21. Dual-axis motor; 22. Slide groove; 23. Sliding seat; 24. Lead screw; 3. Drive ring; 31. Splined shaft; 32. Transmission wheel; 33. Positioning wheel; 34. Enclosed chamber; 4. Fixed ring; 41. Limiting ring; 42. Splined ring; 43. Compression spring; 44. Extrusion plate; 45. Gas guide pipe; 46. Hydrogen cylinder; 5. Fixing frame; 51. Drive roller; 52. Splined pin; 53. Relief groove one; 54. Positioning shaft; 55. Swing ring; 56. Relief groove two; 57. Transmission rod; 58. Sliding ring one; 59. Sliding ring two; 6. Impact rod; 61. Ball joint connecting rod; 62. Impact head; 63. Threaded shaft; 64. Guide seat. Detailed Implementation

[0018] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1:

[0020] Please see Figures 1 to 8 The present invention provides a technical solution: a hydrogen storage cylinder corrosion resistance and airtightness testing device, including an environmental chamber 1, a control component and an impact component. The environmental chamber 1 is provided with a freely opening and closing door on one side. The control component includes a telescopic mechanism for sealing and protecting the cylinder and a rotating mechanism for controlling the positioning of the cylinder. The telescopic mechanism includes a base 2 fixedly connected to the bottom of the interior of the environmental chamber 1, and the rotating mechanism includes a drive ring 3 that is connected to the telescopic mechanism in a transmission manner. The impact assembly includes a mounting bracket 5 fixedly connected to the bottom of the environmental chamber 1 near the base 2.

[0021] In this solution, a control component is used in conjunction with an air pump to perform corrosion fatigue life testing by cyclically filling and discharging hydrogen into the bottle. During the testing process, weak points on the outer wall of the bottle are located simultaneously. Because the pressure inside the bottle changes continuously during the filling and discharging process, and all points on the inner wall of the bottle can be considered to be under uniform pressure, the full contact between hydrogen and the inner wall of the bottle will lead to hydrogen embrittlement. Therefore, when the bottle fails due to damage, the order in which the damage points appear will be based on the structural strength distribution of each point on the bottle. The point with the lowest structural strength will be damaged first. If the damage is too great, it will cause the bottle to leak or explode.

[0022] Therefore, the first point of damage is the weakest point of the bottle, where the structural strength is lowest, and the risk of leakage or explosion is highest. When a weak point is damaged, the bottle material at that point fails due to fiber breakage, matrix cracking, or delamination. During the failure process, the material releases energy in the form of stress waves, generating tiny ultrasonic waves. The control components capture the acoustic signals. When a damage occurs and emits an acoustic signal, the sensor closest to that point receives the signal first, followed by sensors slightly farther away. By calculating the precise time difference of the signal reaching different sensors, a coordinate system is established, and the precise coordinates of the damage are triangulated. At the same time, by analyzing the frequency, amplitude, and other characteristics of the signal, it is possible to distinguish whether it is fiber breakage, matrix cracking, or delamination. The signal intensity reflects the energy of the damage; the greater the energy, the greater the degree of damage.

[0023] Furthermore, by controlling the movement of the bottle body, the weak points on the bottle body are aligned with the impact component. High-pressure helium is then injected into the bottle body using an air pump. Subsequently, the impact component begins mechanical impact testing. By impacting the weak points, the impact failure threshold of the weak points is assessed. During this process, since the bottle body is filled with high-pressure helium, and helium, as an inert gas, has good stability, there is no risk of explosion when the weak points fail, greatly improving the safety protection performance of the testing process.

[0024] On the other hand, by designing the testing process and adding a benchmark and control group, and then by testing the changes in the corrosion resistance fatigue life of the bottle under different impact forces, the relationship between impact energy and the changing trend of bottle life decay is established, and a regression equation is established to predict the remaining life of the bottle.

[0025] Among them, the environmental chamber 1, as an existing technical means in the testing process, has excellent protective performance, which will not be elaborated on here. The door on one side of the environmental chamber 1 can be opened freely, thereby isolating the external environment from the influence of the testing process.

[0026] Example 2:

[0027] A dual-axis motor 21 is fixedly connected to the middle section of the top of the base 2. A sliding groove 22 along its long side is opened on the upper surface of the base 2. Sliding seats 23 are limited and connected at both sides of the dual-axis motor 21 in the sliding groove 22. Both ends of the dual-axis motor 21 are provided with lead screws 24 as its output shafts. Both lead screws 24 pass through and are screwed to the corresponding sliding seats 23.

[0028] Both lead screws 24 are individually controlled by a dual-axis motor 21, and the rotation state and direction of the two lead screws 24 can be freely adjusted.

[0029] The telescopic mechanism includes a drive ring 3 that is rotatably connected to the top of the dual-axis motor 21. Both ends of the drive ring 3 are connected to corresponding sliding seats 23. Both ends of the drive ring 3 are connected to splined shafts 31. The drive ring 3 and the splined shafts 31 are connected by a spline engagement. The splined shafts 31 can extend and retract along the axial direction of the drive ring 3. Both splined shafts 31 are rotatably connected to the corresponding sliding seats 23. The ends of the two splined shafts 31 away from the drive ring 3 are fixedly connected to a transmission wheel 32. The top ends of the outer contours of the two transmission wheels 32 are meshed with positioning wheels 33. The opposite surfaces of the two positioning wheels 33 are fixedly connected to a closed chamber 34.

[0030] First, during corrosion fatigue life testing, the bottle body needs to be placed between two sealed chambers 34, with the chambers 34 fitted onto the outer wall of the bottle. The positions of the chambers 34 are then adjusted to ensure they fit together, guaranteeing a completely sealed bottle body. During this process, the dual-axis motor 21 is activated, further driving two lead screws 24 to rotate. At this time, the two dual-axis motors 21 rotate in opposite directions. Figure 3 For example, since the sliding seat 23 is screwed to the lead screw 24, and the bottom end of the sliding seat 23 slides within the sliding groove 22, that is, under the rotation of the lead screw 24, the two sliding seats 23 slide synchronously towards each other; furthermore, as Figure 4 As shown, since the sealed chamber 34 is fixedly connected to the top of the sliding seat 23, the two sealed chambers 34 move synchronously towards each other, thereby completing the sealing effect on the bottle.

[0031] After the cylinder is completely sealed, the gas pump circulates and releases gas inside the cylinder through the gas pipe 45. This simulates the degradation effects of high-pressure hydrogen on materials such as chemical corrosion, swelling, plasticization, and hydrogen embrittlement under long-term full-pressure storage, thereby testing the fatigue life of the cylinder. During the filling and releasing process, the cylinder is damaged by an array of acoustic reflection sensors installed on the inner wall of the sealed chamber 34. By calculating the precise time difference between the arrival of the acoustic signal emitted by the damage to different sensors, the precise coordinates of the damage are triangulated.

[0032] Example 3:

[0033] Both positioning wheels 33 are fixedly connected to a fixing ring 4 through their centers. The two fixing rings 4 also pass through the corresponding closed chambers 34. Both closed chambers 34 have acoustic emission sensor arrays on their inner walls. Both fixing rings 4 are fixedly connected to a limiting ring 41 on their outer contours at one end inside the closed chamber 34. Both limiting rings 41 are fixedly connected to a compression spring 43 at one end pointing into the closed chamber 34 at the corresponding position. Both compression springs 43 are fixedly connected to a compression plate 44 at the end away from the limiting ring 41. The two compression plates 44 are engaged with the same hydrogen cylinder 46 on their opposite surfaces.

[0034] Both of the two limiting rings 41 are slidably connected to the corresponding extrusion plate 44 at one end, and both of the two compression springs 43 are connected to the corresponding limiting rings 41 via spline engagement. The ends of the two spline rings 42 away from the limiting rings 41 are fixedly connected to the corresponding extrusion plate 44. An air duct 45 is provided on the inner contour of the spline ring 42 near the hatch side. The other end of the air duct 45 extends out of the outside of the environmental chamber 1 and is connected to an air pump.

[0035] Furthermore, during the process of the sealed chamber 34 clamping and sealing the hydrogen cylinder 46, as the sealed chambers 34 approach each other, the two compression plates 44 simultaneously approach each other. At this time, the two ends of the hydrogen cylinder 46 will come into contact with the compression plates 44 and further compress the compression plates 44, causing the compression spring 43 to contract. During this process, the spline ring 42 moves synchronously with the compression plates 44, while the fixed ring 4 remains stationary under the restriction of the limiting ring 41. Therefore, the spline ring 42 will be squeezed into the interior of the fixed ring 4. As the compression degree of the compression spring 43 increases, the frictional pressure between the compression plate 44 and the hydrogen cylinder 46 increases synchronously.

[0036] Once the coordinates of the weak point are located, the position and angle of the hydrogen cylinder 46 need to be adjusted so that the weak point aligns with the impact assembly. During this process, the dual-axis motor 21 is activated, driving the two lead screws 24 to rotate in the same direction. Since the enclosed chamber 34 has now achieved a sealing effect on the hydrogen cylinder 46, the rotation of the two lead screws 24 in the same direction will cause the two enclosed chambers 34 to remain closed and move synchronously. Figure 4 For example, the synchronous clockwise rotation of the two lead screws 24 will cause the two enclosed chambers 34 to move the hydrogen cylinder 46 to the left, and the synchronous counterclockwise rotation of the two lead screws 24 will cause the two enclosed chambers 34 to move the hydrogen cylinder 46 to the right, thereby adjusting the position of the hydrogen cylinder 46 so that its weak point is aligned with the impact component at the same horizontal position.

[0037] After horizontal alignment, the hydrogen cylinder 46 needs to be rotated to ensure that the weak point and the impact component are at the same vertical height. During this process, the drive ring 3 is activated and drives the spline shaft 31 and the transmission wheel 32 to rotate synchronously. The transmission wheel 32 further drives the positioning wheel 33 to rotate. Since the drive ring 3 and the spline shaft 31 are splined together, the spline shaft 31 does not affect its extension and retraction along the axial direction of the drive ring 3 while rotating with the drive ring 3. In this way, the spline shaft 31 can still rotate synchronously with the drive ring 3 when it moves with the sliding seat 23, so that the hydrogen cylinder 46 can be controlled to complete the rotation in different position states.

[0038] Furthermore, such as Figure 5 As shown, the positioning wheel 33 drives the fixed ring 4 to rotate synchronously. The connection relationship between the fixed ring 4 and the spline ring 42 is the same as that between the drive ring 3 and the spline shaft 31. The extension and retraction state of the spline ring 42 does not affect the transmission effect. That is, the spline ring 42 rotates synchronously with the fixed ring 4 and drives the extrusion plate 44 to move synchronously. Since the extrusion plate 44 is in close contact with the hydrogen cylinder 46 and is compressed by the compression spring 43, there is frictional pressure between the extrusion plate 44 and the hydrogen cylinder 46. Therefore, when the extrusion plate 44 rotates, it will drive the hydrogen cylinder 46 to rotate synchronously under the action of friction, thereby adjusting the vertical height of the weak point so that it is completely aligned with the impact component. After alignment, the dual-axis motor 21 is controlled to drive the two lead screws 24 to rotate in opposite directions. At this time, the two closed chambers 34 move in opposite directions, thereby exposing the weak point on the hydrogen cylinder 46.

[0039] Example 4:

[0040] A drive roller 51 driven by a built-in motor is rotatably connected through the middle section of the fixed frame 5. A spline pin 52 is fixedly connected to the outer surface of one side of the drive roller 51, and a relief groove 53 is formed on the outer surface of the other side of the drive roller 51. A positioning shaft 54 ​​passes through the middle section of the relief groove 53. The positioning shaft 54 ​​also passes through the drive roller 51. The two ends of the positioning shaft 54 ​​extend out of the relief groove 53 and pass through the same sway ring 55. The surface of the sway ring 55 has a second relief groove 56 that matches the relief groove 53. 5 is sleeved on the outer contour of the drive roller 51 at the position of the first relief groove 53. One side of the second relief groove 56 is connected to the transmission rod 57 via a pin. The other end of the transmission rod 57 is connected to the first sliding ring 58 via a pin. The side of the first sliding ring 58 away from the transmission rod 57 is fixedly connected to the second sliding ring 59. The first sliding ring 58 and the second sliding ring 59 are both sleeved through the outer contour of the drive roller 51 at the position of the spline pin 52. The first sliding ring 58 and the second sliding ring 59 are connected to the drive roller 51 through the spline pin 52.

[0041] The top of the fixed frame 5 is slidably connected to an impact rod 6. The middle section of the impact rod 6 is driven to a ball joint connecting rod 61. The bottom end of the ball joint connecting rod 61 is driven to engage the inner contour of the oscillating ring 55. The end of the impact rod 6 pointing towards the hydrogen cylinder 46 is fixedly connected to an impact head 62. A helium mass spectrometer is installed on the outer wall of the fixed frame 5 near the impact head 62. A threaded shaft 63 is threaded through and screwed onto the outer contour of the fixed frame 5 on the side away from the impact head 62. One end of the threaded shaft 63 extends toward the sliding ring 58 and is fixedly connected to a guide seat 64. The guide seat 64 is engaged between the sliding ring 58 and the sliding ring 59.

[0042] After aligning the threaded shaft 63 at the weak point, high-pressure helium is filled into the hydrogen cylinder 46 to simulate the high-pressure environment under vehicle conditions. Then, the impact assembly is activated, and the drive roller 51 begins to rotate, driving the spline pin 52, the first clearance groove 53, and the positioning shaft 54 ​​to rotate synchronously. The positioning shaft 54 ​​further drives the sway ring 55 to rotate, and the spline pin 52 further drives the first sliding ring 58 and the second sliding ring 59 to rotate. During this process, since the second clearance groove 56 and the first sliding ring 58 always maintain synchronous rotation, that is, there is no relative movement between the two, the connection angle of the transmission rod 57 remains unchanged.

[0043] When personnel rotate the threaded shaft 63 outside the environmental chamber 1, since the threaded shaft 63 is screwed to the fixed frame 5 and the fixed frame 5 is fixed to the inner wall of the environmental chamber 1, the threaded shaft 63 will drive the guide seat 64 to move horizontally. Furthermore, since the guide seat 64 is engaged between the sliding ring 1 58 and the sliding ring 2 59, the guide seat 64 will simultaneously drive the sliding ring 1 58 and the sliding ring 2 59 to move horizontally. Figure 7 For example, when the threaded shaft 63 rotates clockwise, the threaded shaft 63, guide seat 64, sliding ring 1 58 and sliding ring 2 59 all extend to the right simultaneously. When the threaded shaft 63 rotates counterclockwise, the threaded shaft 63, guide seat 64, sliding ring 1 58 and sliding ring 2 59 all retract to the left simultaneously.

[0044] As sliding ring 58 and sliding ring 59 extend to the right, sliding ring 58 simultaneously pulls transmission rod 57, which in turn pulls sway ring 55. At this time, sway ring 55 deflects around the position through which positioning shaft 54 ​​passes, meaning sway ring 55 is in an inclined state. Through the cooperation of relief groove 2 56 and relief groove 1 53, space is provided for the inclination of sway ring 55 and its maximum inclination angle is limited. Since sway ring 55 will still rotate synchronously with fixed frame 5 after tilting, the movement trajectory of sway ring 55 is a circular wave-like reciprocating swing process. The bottom end of ball joint 61 is engaged inside sway ring 55, meaning that ball joint 61 tends to move synchronously with sway ring 55. Under the transmission of sway ring 55's reciprocating swing, ball joint 61 drives impact rod 6 and impact head 62 to achieve reciprocating extension and retraction. Through the reciprocating extension and retraction of impact head 62, continuous impact is achieved on the weak points of hydrogen cylinder 46.

[0045] It should be noted that the maximum stroke of the reciprocating motion of the impact head 62 is limited by the tilt angle of the sway ring 55. Its maximum stroke is twice the horizontal distance between the tilt position and the vertical position of the sway ring 55. Therefore, by controlling the rotation of the threaded shaft 63, the tilt angle of the sway ring 55 can be controlled, thereby controlling the maximum stroke of the reciprocating motion of the impact head 62. By adjusting the maximum stroke of the impact head 62, the impact intensity of the weak point can be controlled, so as to test the impact energy on the fatigue life of the hydrogen cylinder 46 under different impact intensities.

[0046] by Figure 5 For example, multiple hydrogen cylinders 46 produced in the same batch and continuously were selected and divided into three groups: A, B, and C. Each group contained at least one hydrogen cylinder 46 to ensure that the initial performance differences between the samples were minimized. Among them, A served as the benchmark group to establish the performance curve; B served as the experimental group to study the effect of impact damage; and C served as the control group to verify the benchmark and separate the effect of pure fatigue.

[0047] In Group A, corrosion fatigue testing was conducted until failure. This involved cyclically filling and discharging hydrogen in hydrogen cylinder 46 until leakage or explosion occurred. Since hydrogen cylinder 46 was enclosed inside sealed chamber 34 during the filling and discharging process, the risk of deflagration and explosion that would occur if hydrogen cylinder 46 leaked was effectively avoided, thereby improving the safety performance of the testing process. When hydrogen cylinder 46 of Group A failed, the baseline fatigue life N was obtained.

[0048] Furthermore, Group B first conducted a mechanical impact test and recorded the impact intensity of the impact head 62. After the impact test, a helium mass spectrometer installed on the outer wall of the fixture 5 was used to perform helium detection on the weak point to determine whether a leak had occurred at the weak point. If a leak occurred, it indicated that the current impact intensity exceeded the safety threshold. A new hydrogen cylinder 46 was then selected to conduct a mechanical impact test again with a reduced impact intensity until the critical impact intensity at which the hydrogen cylinder 46 would not leak after the test was found. This value is the impact failure threshold of the hydrogen cylinder 46. Subsequently, the hydrogen cylinder 46 after the mechanical impact test by Group B was subjected to a corrosion fatigue test until the hydrogen cylinder 46 failed, thereby obtaining the fatigue life M after the impact.

[0049] Furthermore, corrosion fatigue tests were conducted on group C until failure to obtain fatigue life P. The consistency of components was verified by comparing P with N. If the values ​​of P and N differed significantly, groups A and C were retested until the values ​​of P and N were nearly identical. Subsequently, the life decay rate was calculated by comparing M and N. By conducting group B experiments multiple times, M under different impact intensities within the safety threshold was obtained. Then, the trend of impact energy and life decay was correlated, and a regression equation was established to predict the remaining life of hydrogen cylinder 46 after impact in actual vehicle scenarios.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the corrosion resistance and airtightness of hydrogen storage cylinders, comprising an environmental chamber (1), characterized in that: It also includes a control component and an impact component. The environmental chamber (1) is provided with a freely opening and closing door on one side. The control component includes a telescopic mechanism for sealing and protecting the bottle and a rotating mechanism for controlling the positioning of the bottle. The telescopic mechanism includes a base (2) fixedly connected to the bottom of the interior of the environmental chamber (1), and the rotating mechanism includes a drive ring (3) that is connected to the telescopic mechanism in a transmission manner. The impact assembly includes a mounting bracket (5) fixedly connected to the bottom of the environmental chamber (1) near the base (2).

2. The corrosion resistance and airtightness testing equipment for hydrogen storage cylinders according to claim 1, characterized in that: A dual-axis motor (21) is fixedly connected to the middle section of the top of the base (2). A sliding groove (22) along its long side is opened on the upper surface of the base (2). Sliding seats (23) are limited and connected at both sides of the dual-axis motor (21) in the sliding groove (22). Both ends of the dual-axis motor (21) are provided with lead screws (24) as its output shafts. Both lead screws (24) pass through and are screwed to the corresponding sliding seats (23).

3. The corrosion resistance and airtightness testing equipment for hydrogen storage cylinders according to claim 2, characterized in that: Both lead screws (24) are individually controlled by a dual-axis motor (21), and the rotation state and direction between the two lead screws (24) can be freely adjusted.

4. The corrosion resistance and airtightness testing equipment for hydrogen storage cylinders according to claim 1, characterized in that: The telescopic mechanism includes a drive ring (3) that passes through and is rotatably connected to the top of the dual-axis motor (21). Both ends of the drive ring (3) pass through corresponding sliding seats (23). Both ends of the drive ring (3) are connected by splined shafts (31). The drive ring (3) and the splined shafts (31) are connected by a spline engagement. The splined shafts (31) can extend and retract along the axial direction of the drive ring (3). Both splined shafts (31) pass through and are rotatably connected to the corresponding sliding seats (23). The ends of the two splined shafts (31) away from the drive ring (3) are fixedly connected to transmission wheels (32). The top ends of the outer contours of the two transmission wheels (32) are meshed with positioning wheels (33). The opposite surfaces of the two positioning wheels (33) are fixedly connected to enclosed chambers (34).

5. The corrosion resistance and airtightness testing equipment for hydrogen storage cylinders according to claim 4, characterized in that: Both positioning wheels (33) are fixedly connected to a fixed ring (4) through their center. Both fixed rings (4) also pass through the corresponding closed chambers (34). Both closed chambers (34) are equipped with acoustic emission sensor arrays on their inner walls. Both fixed rings (44) are fixedly connected to a limiting ring (41) on their outer contour at one end inside the closed chamber (34). Both limiting rings (41) are fixedly connected to a compression spring (43) at the end pointing to the inside of the corresponding closed chamber (34). Both compression springs (43) are fixedly connected to a compression plate (44) at the end away from the limiting ring (41). Both compression plates (44) are held and clamped together on their opposite surfaces by the same hydrogen cylinder (46).

6. The corrosion resistance and airtightness testing equipment for hydrogen storage cylinders according to claim 5, characterized in that: The two limiting rings (41) are slidably connected to the corresponding extrusion plate (44) by a spline ring (42), and the two compression springs (43) are connected to the corresponding limiting rings (41) by a spline engagement. The ends of the two spline rings (42) away from the limiting rings (41) are fixedly connected to the corresponding extrusion plate (44). An air duct (45) is provided on the inner contour of the spline ring (42) near the hatch side. The other end of the air duct (45) extends out of the outside of the environmental chamber (1) and is connected to an air pump.

7. The corrosion resistance and airtightness testing equipment for hydrogen storage cylinders according to claim 1, characterized in that: The middle section of the fixed frame (5) is rotatably connected to a drive roller (51) driven by a built-in motor. A spline pin (52) is fixedly connected to the outer surface of one side of the drive roller (51). A relief groove (53) is formed on the outer surface of the other side of the drive roller (51). A positioning shaft (54) passes through the middle section of the relief groove (53). The positioning shaft (54) also passes through the drive roller (51). The two ends of the positioning shaft (54) extend out of the relief groove (53) and pass through the same sway ring (55). The surface of the sway ring (55) is provided with a relief groove (56) that matches the relief groove (53). The first sliding ring (58) is sleeved on the outer contour of the drive roller (51) at the position of the first relief groove (53). One side of the second relief groove (56) is connected to the transmission rod (57) via a pin. The other end of the transmission rod (57) is connected to the first sliding ring (58) via a pin. The side of the first sliding ring (58) away from the transmission rod (57) is fixedly connected to the second sliding ring (59). The first sliding ring (58) and the second sliding ring (59) are both sleeved on the outer contour of the drive roller (51) at the position of the spline pin (52). The first sliding ring (58) and the second sliding ring (59) are connected to the drive roller (51) via the spline pin (52).

8. The corrosion resistance and airtightness testing equipment for hydrogen storage cylinders according to claim 7, characterized in that: The top of the fixed frame (5) is slidably connected to an impact rod (6), the middle section of the impact rod (6) is connected to a ball joint (61), the bottom end of the ball joint (61) is driven and engaged on the inner contour of the oscillating ring (55), the end of the impact rod (6) pointing towards the hydrogen cylinder (46) is fixedly connected to an impact head (62), a helium mass spectrometer is provided on the outer wall of the fixed frame (5) near the impact head (62), a threaded shaft (63) is threaded through and screwed onto the outer contour of the fixed frame (5) away from the impact head (62), one end of the threaded shaft (63) extends toward the first sliding ring (58) and is fixedly connected to a guide seat (64), the guide seat (64) is engaged between the first sliding ring (58) and the second sliding ring (59).

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