A device for ultrasonic testing of a welding seam of a type iv hydrogen storage cylinder

Abstract

The utility model discloses a kind of Ⅳ type hydrogen storage gas cylinder weld ultrasonic detection's device including mounting seat, overflow cutting assembly, probe detection assembly, coupling agent liquid injection assembly, mounting seat is equipped with two interval adjustable clamping fixed structure, mounting seat is also equipped with multiple fixed rings, clamping fixed structure includes clamping piece and the rotary drive unit for driving clamping piece rotation. Hydrogen cylinder is fixed through fixed ring, then two clamping fixed structures are used for clamping fixed boss inner container interface respectively, overflow cutting assembly is adjusted to cut in alignment overflow position, then overflow cutting assembly sprays coupling agent at hydrogen cylinder weld, probe assembly is nondestructive ultrasonic scanning to weld, when cutting and scanning, rotary drive unit drives clamping piece to drive hydrogen cylinder rotation, so that the periphery of hydrogen cylinder is all cut and scanned, and according to cutting speed and scanning speed adjustment rotation speed.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen storage cylinder testing technology, and in particular to a device for ultrasonic testing of weld seams of Type IV hydrogen storage cylinders. Background Technology

[0002] With the rapid development of the hydrogen energy industry, Type IV hydrogen storage cylinders, as the core hydrogen storage component of hydrogen fuel cell vehicles, have become a key technological breakthrough direction for hydrogen energy applications due to their advantages such as lightweight design, high hydrogen storage density, and corrosion resistance. Type IV cylinders adopt an all-composite material structure, with an inner liner made of thermoplastic polymer materials (such as HDPE and PA), and an outer layer formed by carbon fiber / glass fiber reinforced resin winding, possessing excellent fatigue resistance and high-pressure resistance (working pressure can reach over 70MPa). Compared to metal-lined cylinders, their weight is reduced by 30% to 50%, significantly improving the energy efficiency and driving range of on-board hydrogen storage systems.

[0003] As a key component of Type IV hydrogen storage cylinders, the inner liner determines the production efficiency and hydrogen safety performance of Type IV hydrogen storage cylinders. Currently, domestic and foreign cylinder manufacturers widely adopt injection molding and welding processes (such as laser welding, ultrasonic welding, or hot plate welding) to manufacture the inner liners of small and medium-sized Type IV hydrogen storage cylinders. This process has high production efficiency, low production cost, good inner liner density, and stable inner liner dimensions.

[0004] In the manufacturing process of polymer liner cylinders, welding technology is one of the core factors determining the cylinder's performance. However, microscopic defects (such as lack of fusion, porosity, and abnormal crystallinity in the heat-affected zone) are easily generated during welding. These defects may evolve into microcracks under high-pressure cyclic loading, leading to a surge in hydrogen permeability or even sudden failure. Therefore, inspecting the quality of the weld seams in the welded liner cylinder is a crucial guarantee of its safety performance.

[0005] Currently, national standards (such as GB-T42612) clearly require non-destructive testing of weld seams on Type IV gas cylinders. Traditional manual flaw detection suffers from low efficiency and poor consistency, failing to meet the needs of large-scale production. Existing ultrasonic testing equipment is mostly designed for metal weld seams and is difficult to adapt to the complex weld seams of polymer materials. Therefore, the industry urgently needs to develop a device and method for ultrasonic testing of weld seams on Type IV hydrogen storage cylinders to improve the testing quality and efficiency of injection-molded Type IV hydrogen storage cylinder liners. Utility Model Content

[0006] The purpose of this utility model is to provide a device for ultrasonic testing of weld seams of Type IV hydrogen storage cylinders, so as to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0007] The technical solution adopted to solve the above-mentioned technical problems is as follows: This utility model provides a device for ultrasonic testing of weld seams of a Type IV hydrogen storage cylinder, comprising a mounting base, an overflow cutting assembly, a probe detection assembly, and a coupling agent spraying assembly. The mounting base has two adjustable-spaced snap-fit ​​fixing structures, which are used to snap and fix the BOSS inner liner interface. The adjustable space between the two snap-fit ​​fixing structures is along the extension direction of the hydrogen cylinder. The mounting base also has multiple fixing rings, which are spaced apart along the extension direction of the hydrogen cylinder. The fixing rings are used to fit and fix the hydrogen cylinder. The snap-fit ​​fixing structure includes a snap-fit ​​component and a rotation drive unit for driving the snap-fit ​​component to rotate. The overflow cutting assembly is used to cut the overflow at the weld seam of the hydrogen cylinder. The probe detection assembly is used to detect the weld seam of the hydrogen cylinder and the BOSS inner liner interface. The coupling agent spraying assembly is used to spray coupling agent to cooperate with the probe detection assembly for detection. The overflow cutting assembly, probe detection assembly, and coupling agent spraying assembly are all slidably disposed on the mounting base along the extension direction of the hydrogen cylinder and located on the side of the hydrogen cylinder.

[0008] The beneficial effects of this utility model are: The hydrogen cylinder is secured by a through-ring, and then two snap-fit ​​fixing structures are used to snap-fit ​​the BOSS inner liner interface. The overflow cutting assembly is adjusted to align with the overflow position for cutting. Then, the overflow cutting assembly sprays coupling agent onto the weld of the hydrogen cylinder, ensuring that the probe of the probe detection assembly is fully in contact with the weld. The probe assembly performs non-destructive ultrasonic scanning on the weld. During cutting and scanning, the rotation drive unit drives the snap-fit ​​component to rotate the hydrogen cylinder, ensuring that all four sides of the hydrogen cylinder are cut and scanned. The rotation speed is adjusted according to the cutting and scanning speeds. The same method is used to continue testing the BOSS inner liner interface to improve the testing quality and efficiency of the injection-molded welded Type IV hydrogen storage cylinder inner liner.

[0009] As a further improvement to the above technical solution, the mounting base has multiple slide rails, and the overflow cutting component, probe detection component, coupling agent spraying component, and snap-fit ​​fixing structure are all slidably fixed to the corresponding slide rails.

[0010] As a further improvement to the above technical solution, the inner side of the fixing ring is provided with multiple balls or the fixing ring is a bearing component.

[0011] As a further improvement to the above technical solution, one side of the fixing ring can be slidably disposed on the slide rail where the snap-fit ​​fixing structure is located.

[0012] As a further improvement to the above technical solution, the overflow cutting assembly includes a plurality of annular cutting parts spaced around the outer periphery of the hydrogen cylinder.

[0013] As a further improvement to the above technical solution, the cutting part includes a cutting part and a protective part, and the relative position between the cutting part and the protective part is adjustable.

[0014] As a further improvement to the above technical solution, the cutting component also includes a mounting portion, wherein both the cutting portion and the protective portion are slidably fixed to the mounting portion along the radial direction of the hydrogen cylinder.

[0015] As a further improvement to the above technical solution, the snap-fit ​​component includes a chuck.

[0016] As a further improvement to the above technical solution, the chuck includes at least two arc-shaped chuck flaps, an annular sealing groove, a pre-tightening bolt group, and an anti-rotation pin. The inner wall of the arc-shaped chuck flaps is provided with radially protruding locking teeth. The annular sealing groove is located on the axial end face of the chuck and has a built-in sealing ring. The pre-tightening bolt group circumferentially penetrates the chuck connection part. The anti-rotation pin is inserted perpendicularly to the axis of the chuck into the positioning hole on the outer wall of the BOSS head.

[0017] As a further improvement to the above technical solution, the cutting surface size of the overflow cutting component is larger than the detection surface size of the probe detection component. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is an initial structural schematic diagram of a device for ultrasonic testing of weld seams in a Type IV hydrogen storage cylinder; Figure 2 A schematic diagram of the structure of a device for ultrasonic testing of weld seams in a Type IV hydrogen storage cylinder during the cutting of the weld seam; Figure 3 A schematic diagram of the cutting component of a device for ultrasonic testing of weld seams in a Type IV hydrogen storage cylinder; Figure 4 A schematic diagram of the structure of an ultrasonic testing device for weld seams of a Type IV hydrogen storage cylinder during weld seam inspection; Figure 5 This is a schematic diagram of the structure of an ultrasonic testing device for weld seams of a Type IV hydrogen storage cylinder when scanning the interface of the inner liner of a BOSS gas cylinder.

[0019] Figure label: Mounting base 100, chuck 110, retaining ring 120, rotary drive unit 130, chuck rail 140, cutting rail 150, detection rail 160, hydrogen cylinder 200, weld seam 210, BOSS head 220, BOSS inner liner interface 230, overflow cutting assembly 300, cutting part 310, protection part 320, probe 410, coupling agent nozzle 510. Detailed Implementation

[0020] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0021] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, if there are words such as "several", they mean one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0023] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] This invention provides a device and method for ultrasonic testing of weld seams in Type IV hydrogen storage cylinders, addressing the problems of low efficiency, poor consistency, inability to meet the needs of large-scale production, and difficulty in adapting to the complex weld seams 210 of polymer materials in traditional manual ultrasonic testing of Type IV hydrogen storage cylinders. The BOSS head 220 of the Type IV hydrogen storage cylinder is a key component, typically referring to the metal interface structure used to connect valves, pipelines, or other external equipment. (Refer to...) Figures 1 to 5 This utility model provides a device for ultrasonic testing of weld seams in Type IV hydrogen storage cylinders, and provides the following embodiments: An ultrasonic testing device for weld seams of a Type IV hydrogen storage cylinder includes a mounting base 100, an overflow cutting assembly 300, a probe detection assembly, and a coupling agent spraying assembly. The mounting base 100 is used to fix the hydrogen cylinder 200. The overflow cutting assembly 300 removes overflow material at the weld seam 210. The probe detection assembly is used to detect and scan the weld seam 210 and the BOSS inner liner interface 230 of the hydrogen cylinder 200. The coupling agent spraying assembly sprays out coupling agent liquid, so that the coupling agent of the probe assembly completely wets the area to be inspected and fills the gap between the probe 410 and the area to be tested, thereby improving the detection effect.

[0025] Mounting base 100 is a base with two adjustable snap-fit ​​fixing structures. The two probe assembly snap-fit ​​fixing structures are used to snap-fit ​​and fix the BOSS inner liner interface 230. The adjustable direction of the interval between the two snap-fit ​​fixing structures is adjustable along the extension direction of the hydrogen cylinder 200 to adapt to gas cylinders of different lengths and sizes.

[0026] The probe assembly snap-fit ​​fixing structure includes a snap-fit ​​component and a rotary drive unit 130 for driving the snap-fit ​​component to rotate. The output end of the rotary drive unit 130 is connected to the snap-fit ​​component for transmission. When the rotary drive unit 130 drives the snap-fit ​​component to rotate, the hydrogen cylinder 200 located on the snap-fit ​​component also rotates accordingly. During cutting and scanning, the rotary drive unit 130 drives the snap-fit ​​component to rotate the hydrogen cylinder 200 so that all four sides of the hydrogen cylinder 200 are cut and scanned. The rotation speed is adjusted according to the cutting speed and scanning speed. The same method is used to continue to detect the BOSS inner liner interface 230 to improve the detection quality and efficiency of the injection-molded welded type IV hydrogen storage cylinder inner liner.

[0027] To better secure the hydrogen cylinder 200, the probe assembly mounting base 100 is also provided with two fixing rings 120. The two probe assembly fixing rings 120 are spaced apart along the extension direction of the hydrogen cylinder 200. The hydrogen cylinder 200 passes through the fixing rings 120 and is fitted onto the mounting base 100. Multiple ball bearings are provided inside the fixing rings 120, and the ball bearings are arranged in a ring at intervals inside the probe assembly fixing rings 120. When the rotation drive unit 130 is started, the fixing rings 120 remain stationary, and the hydrogen cylinder 200 rotates within the fixing rings 120. This reduces the friction between the probe assembly hydrogen cylinder 200 and the probe assembly fixing rings 120 when the probe assembly hydrogen cylinder 200 rotates, avoiding interference during the rotation of the probe assembly hydrogen cylinder 200 and preventing any impact on the surface of the probe assembly hydrogen cylinder 200. In some other embodiments, the probe assembly retaining ring 120 is a bearing component, comprising an inner ring, multiple balls, and an outer ring. The multiple balls are evenly distributed between the inner and outer rings. The outer ring is fixed to the mounting base 100, and the inner ring is fitted around the outer periphery of the hydrogen cylinder 200. When the hydrogen rotates, the inner ring rotates with the hydrogen cylinder 200, while the outer ring remains stationary. In some other embodiments, the retaining ring 120 is directly rotatably mounted on the mounting base 100, and the retaining ring 120 fits around the outer periphery of the hydrogen cylinder 200 and rotates with the hydrogen cylinder 200.

[0028] To facilitate the movement of the snap-fit ​​fixing structure, overflow cutting component 300, probe detection component, and coupling agent spraying component, the probe component mounting base is equipped with more than 100 slide rails. Multiple slide rails are slidably arranged along the extension direction of the hydrogen cylinder 200. The probe component overflow cutting component 300, probe detection component, coupling agent spraying component, and snap-fit ​​fixing structure are all slidably fixed to the corresponding slide rails. Among them, the snap-fit ​​fixing structure is a chuck track 140, the overflow cutting component 300 is a cutting track 150, and the probe detection component and coupling agent spraying component can be set on the same track, which is the detection track 160. The chuck track 140 is located between the cutting track 150 and the detection track 160.

[0029] The overflow cutting assembly 300 is used to cut the overflow at the weld 210 of the probe assembly hydrogen cylinder 200. The probe assembly overflow cutting assembly 300 may include one or two cutting elements. When two cutting elements are provided, the two cutting elements are located on opposite sides of the hydrogen cylinder 200 to improve cutting efficiency. For more details, refer to... Figure 3 As shown, the probe assembly cutting component includes a cutting part 310 and a protective part 320. The relative position between the cutting part 310 and the protective part 320 is adjustable. When the cutting part 310 feeds and cuts, it performs the cutting while the protective part 320 remains suspended. When the protective part 320 contacts the hydrogen cylinder 200, the cutting part 310 stops feeding, completing the cutting. The adjustable relative position between them limits the amount of cutting, avoids over-cutting, and protects the hydrogen cylinder 200.

[0030] The probe assembly cutting component also includes a mounting part. Both the probe assembly cutting part 310 and the protective part 320 are slidably fixed to the probe assembly mounting part along the radial direction of the probe assembly hydrogen cylinder 200. Specifically, a guide groove is provided in the mounting part, and the probe assembly cutting part 310 and the protective part 320 are slidably positioned in the probe assembly guide groove. After adjusting the relative positions of the cutting part 310 and the protective part, they are tightened with bolts. The overflow cutting assembly 300 is a cutting track 150. The position of the cutting assembly is adjusted according to the position of the weld 210 to ensure accurate cutting.

[0031] The probe detection assembly is used to detect the weld 210 of the hydrogen cylinder 200 and the interface 230 of the BOSS inner liner. It records the ultrasonic non-destructive scanning results of the two key areas, the weld 210 of the probe assembly and the interface 230 of the BOSS inner liner of the probe assembly. The probe detection assembly includes a probe 410 that can perform ultrasonic detection.

[0032] Because the acoustic impedance difference between the air and the inner liner being tested is too large, resulting in significant ultrasonic wave reflection and preventing effective penetration into the material, a couplant spray assembly is used. The couplant in the probe assembly serves to eliminate air between the probe 410 and the area being tested. During testing, it is essential to ensure that the probe 410 and the area being tested are completely filled with couplant. The composition of the couplant must meet requirements for acoustic impedance matching, safety, and environmental adaptability. Its composition can be adjusted based on the material of the inner liner and the material of the probe 410. Generally, to reduce costs and increase efficiency, a water-based couplant system composed of deionized water, glycerin, and propylene glycol is recommended.

[0033] The coupling agent spraying assembly is used to spray coupling agent in conjunction with the probe detection assembly for detection. Both the probe detection assembly and the coupling agent spraying assembly are slidably fixed on the detection track 160. The probe detection assembly is adjusted according to the position of the weld 210 and the position of the BOSS inner liner interface 230 for accurate detection. The coupling agent spraying assembly includes a coupling agent nozzle 510, a dispensing pump, and an electromagnetic control valve. The dispensing pump and electromagnetic control valve are located on the inlet pipe of the coupling agent nozzle 510. The coupling agent nozzle 510 should continuously spray coupling agent in a stream or jet form to wet the area to be tested and fill the gap between the area to be tested and the probe 410, and should not spray in a mist form. The coupling agent nozzle 510 is positioned close to the probe 410 to ensure complete wetting of the area to be tested and filling of the gap between the probe 410 and the area to be tested. In this embodiment, The hydrogen cylinder 200 is fixed by the through-fixing ring 120. Then, two probe assembly clamping and fixing structures are used to clamp and fix the BOSS inner liner interface 230. The overflow cutting assembly 300 is adjusted to cut at the overflow position. Then, the overflow cutting assembly 300 sprays coupling agent at the weld 210 of the hydrogen cylinder 200, so that the probe 410 of the probe detection assembly is fully in contact with the weld 210. The probe assembly performs non-destructive ultrasonic scanning at the weld 210. During cutting and scanning, the rotation drive unit 130 drives the clamping part to rotate the hydrogen cylinder 200 so that all four sides of the hydrogen cylinder 200 are cut and scanned. The rotation speed is adjusted according to the cutting speed and scanning speed. The BOSS inner liner interface 230 is inspected in the same way to improve the inspection quality and efficiency of the injection-molded welded type IV hydrogen storage cylinder inner liner.

[0034] Further improvements include allowing the probe assembly retaining ring 120 to move to a certain extent on the slide rail of the probe assembly chuck 110, adjusting the position of the retaining ring 120 according to the length of the hydrogen cylinder 200, so as to better secure the hydrogen cylinder 200.

[0035] Further improvements include a chuck 110 for the probe assembly connector.

[0036] The probe assembly chuck 110 includes at least two arc-shaped clasps, an annular sealing groove, a pre-tightening bolt group, and an anti-rotation pin. The inner wall of the arc-shaped clasps of the probe assembly is provided with radially protruding locking teeth. The annular sealing groove of the probe assembly is located on the axial end face of the clasp. The annular sealing groove of the probe assembly has a built-in sealing ring. The pre-tightening bolt group of the probe assembly circumferentially penetrates the clasp connection part. The anti-rotation pin of the probe assembly is inserted perpendicularly to the axis of the clasp into the positioning hole on the outer wall of the BOSS head 220.

[0037] Further improvements include a cutting surface size of the overflow cutting component 300 of the probe assembly that is larger than the detection surface size of the probe detection component of the probe assembly, in order to ensure a tight connection between the probe 410 of the probe assembly and the area to be measured in the probe assembly.

[0038] The following describes the usage of an ultrasonic testing device for weld seams of a Type IV hydrogen storage cylinder. First, thoroughly clean the probe assembly hydrogen cylinder 200, especially the probe assembly weld 210 and the interface between the probe assembly BOSS head 220 and the inner liner, ensuring the surface is free of oil, dust, and other impurities. Then, control the two probe assembly rotation drive units 130 on the probe assembly base, moving them relatively far apart along the slide rail of the probe assembly chuck 110 until the distance between the two probe assembly rotation drive units 130 is greater than the distance between the probe assembly hydrogen cylinder 200. After inserting and securing the BOSS head 220 on one side of the probe assembly hydrogen cylinder 200 into the probe assembly chuck 110, control the probe assembly rotation drive units 130 to move closer together along the slide rail of the probe assembly chuck 110 until the BOSS head 220 on the other side of the probe assembly hydrogen cylinder 200 is inserted and secured in the other probe assembly chuck 110. Adjust the position of the two probe assembly rotation drive units 130 and the probe assembly hydrogen cylinder 200 as a whole on the slide rail of the probe assembly chuck 110, ensuring they are centered on the probe assembly base. Then, the probe assembly hydrogen cylinder 200 is fixed in place using the probe assembly retaining rings 120 on both sides of the probe assembly chuck 110 slide rail, as shown in the reference. Figure 1 As shown.

[0039] Adjust the position of the probe assembly cutting part on the probe assembly cutting track 150, fix the probe assembly cutting part at the position corresponding to the probe assembly weld 210, and make appropriate fine adjustments so that the probe assembly cutting part 310 corresponds to the probe assembly weld 210. The probe assembly rotation drive unit 130 is activated. This unit drives the probe assembly chuck 110, which in turn drives the probe assembly BOSS head 220 and the probe assembly hydrogen cylinder 200 to rotate. After setting the rotation speed of the probe assembly rotation drive unit 130 to approximately 1 r / s, it is activated. Once the rotation speed reaches the set standard, the probe assembly cutting component is controlled to gradually approach the probe assembly weld 210. During this process, the overflow material from the probe assembly weld 210 is cut by the cutting part 310 in the stepping probe assembly cutting component during high-speed rotation. The cutting of the probe assembly weld 210 is completed when the probe assembly protection part 320 in the cutting component contacts the probe assembly hydrogen cylinder 200. (Refer to...) Figure 2 As shown.

[0040] Adjust the position of the probe assembly coupling agent nozzle 510 on the probe assembly detection track 160 so that the probe assembly coupling agent nozzle 510 is aligned with the flattened probe assembly weld 210. Start the probe assembly coupling agent nozzle 510 and the probe assembly rotation drive unit 130 so that the probe assembly coupling agent nozzle 510 sprays out the probe assembly coupling agent to evenly wet the flattened probe assembly weld 210. When initially wetting the probe assembly weld 210, in order to increase the wetting efficiency, the rotation speed of the rotation drive unit 130 can be set to 0.5r / s ~ 1r / s. After the probe assembly weld 210 is fully wetted by the probe assembly coupling agent, stop the rotation of the probe assembly rotation drive unit 130.

[0041] Adjust the position of probe 410 on probe assembly detection track 160 so that probe 410 is aligned with the flattened probe assembly weld 210. Adjust the position of couplant nozzle 510 on probe assembly detection track 160 so that it is close to probe 410 without interfering with it. Turn on couplant nozzle 510 to wet the flattened probe assembly weld 210 with couplant. Start probe assembly rotation drive unit 130 and rotate it at a low speed of about 0.1 r / s to 0.5 r / s. Fine-tune the specific position of probe 410 so that the gap between it and probe assembly weld 210 is just filled with couplant. At this time, the scanning situation can be observed through the observer. After scanning probe assembly weld 210 several times, stop the rotation of probe assembly rotation drive unit 130 to complete the scanning of probe assembly weld 210. Figure 4 As shown.

[0042] Adjust the position of probe 410 on the probe assembly detection track 160 so that probe 410 is aligned with the inner interface of the probe assembly BOSS head 220. Adjust the position of the couplant nozzle 510 on the probe assembly detection track 160 so that it is close to probe 410 without interfering with it. Open the couplant nozzle 510 to wet the inner interface of the probe assembly BOSS head 220 with couplant. Start the probe assembly rotation drive unit 130 and rotate it at a low speed of about 0.1 r / s to 0.5 r / s. Fine-tune the position of probe 410 so that the gap between it and the inner interface of the probe assembly BOSS head 220 is just filled with couplant. The scanning process can be observed through the observer. After several scans of the inner interface of the probe assembly BOSS head 220, stop the rotation of the probe assembly rotation drive unit 130 to complete the scanning of the inner interface of the probe assembly BOSS head 220. (Refer to...) Figure 5 As shown.

[0043] After the probe assembly 410 has completely recorded the scanning results at the interface between the flattened probe assembly weld 210 and the inner liner of the probe assembly BOSS head 220, the probe assembly 410 and the probe assembly coupling agent nozzle 510 are moved back to their initial positions. The restriction of the probe assembly chuck 110 on the probe assembly BOSS head 220 is released, the probe assembly fixing ring 120 is opened, and then the two probe assembly rotation drive units 130 are controlled to move away from each other on the slide rail of the probe assembly chuck 110. The scanned probe assembly hydrogen cylinder 200 is then removed, completing the scanning.

[0044] The preferred embodiments of this utility model have been described in detail above. However, the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A device for ultrasonic testing of a weld of a Type IV hydrogen storage cylinder, characterized in that, include: The mounting base is provided with two adjustable-spaced snap-fit ​​fixing structures. The two snap-fit ​​fixing structures are used to snap-fit ​​and fix the BOSS inner liner interface. The adjustable direction of the spacing between the two snap-fit ​​fixing structures is adjustable along the extension direction of the hydrogen cylinder. The mounting base is also provided with multiple fixing rings. The multiple fixing rings are spaced apart along the extension direction of the hydrogen cylinder. The fixing rings are used to fit and fix the hydrogen cylinder. The snap-fit ​​fixing structure includes a snap-fit ​​component and a rotation drive unit for driving the snap-fit ​​component to rotate. Overflow cutting assembly, used to cut overflow at the weld seams of hydrogen cylinders; The probe detection assembly is used to detect the weld seams of hydrogen cylinders and the interface of the BOSS inner liner. Coupling agent spraying assembly, used to spray coupling agent to cooperate with probe detection assembly for detection; The overflow cutting assembly, the probe detection assembly, and the coupling agent spraying assembly are all slidably mounted on the mounting base along the extension direction of the hydrogen cylinder and located on the side of the hydrogen cylinder.

2. The device for ultrasonic testing of weld seams of a Type IV hydrogen storage cylinder according to claim 1, characterized in that: The mounting base has multiple slide rails, and the overflow cutting component, probe detection component, coupling agent spraying component, and snap-fit ​​fixing structure are all slidably fixed to the corresponding slide rails.

3. The device for ultrasonic testing of weld seams of a Type IV hydrogen storage cylinder according to claim 1, characterized in that: The inner side of the fixed ring is provided with multiple balls, or the fixed ring is a bearing component.

4. The device for ultrasonic testing of weld seams of a Type IV hydrogen storage cylinder according to claim 1, characterized in that: One side of the fixing ring can be slidably mounted on the slide rail where the snap-fit ​​fixing structure is located.

5. The device for ultrasonic testing of weld seams of a Type IV hydrogen storage cylinder according to claim 1, characterized in that: The overflow cutting assembly includes a plurality of annular cutting elements spaced around the outer periphery of the hydrogen cylinder.

6. The device for ultrasonic testing of weld seams of a Type IV hydrogen storage cylinder according to claim 5, characterized in that: The cutting component includes a cutting part and a protective part, and the relative position between the cutting part and the protective part is adjustable.

7. The device for ultrasonic testing of weld seams of a Type IV hydrogen storage cylinder according to claim 6, characterized in that: The cutting component also includes a mounting portion, wherein both the cutting portion and the protective portion are slidably fixed to the mounting portion along the radial direction of the hydrogen cylinder.

8. The device for ultrasonic testing of weld seams of a Type IV hydrogen storage cylinder according to claim 1, characterized in that: The locking component includes a chuck.

9. The device for ultrasonic testing of weld seams of a Type IV hydrogen storage cylinder according to claim 8, characterized in that: The chuck includes at least two arc-shaped chuck flaps, an annular sealing groove, a pre-tightening bolt group, and an anti-rotation pin. The inner wall of the arc-shaped chuck flaps is provided with radially protruding locking teeth. The annular sealing groove is located on the axial end face of the chuck and has a built-in sealing ring. The pre-tightening bolt group circumferentially penetrates the chuck connection part. The anti-rotation pin is inserted perpendicularly to the axis of the chuck into the positioning hole on the outer wall of the BOSS head.

10. The device for ultrasonic testing of weld seams of a Type IV hydrogen storage cylinder according to claim 9, characterized in that: The cutting surface size of the overflow cutting component is larger than the detection surface size of the probe detection component.

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