Eddy current detection system of liquid hydrogen storage and transportation equipment

Abstract

The invention discloses an eddy current detection system for liquid hydrogen storage and transportation equipment, and relates to the technical field of material detection, and the eddy current detection system comprises a guide pipe which is spirally wound on the outer surface of the liquid hydrogen storage and transportation equipment; the detection assembly comprises a flexible plate and a detection probe, and the detection probe is fixedly arranged on one side face of the flexible plate; the detection assembly penetrates through the driving device, and the driving device is used for driving the detection assembly to advance or retreat, so that the detection assembly is inserted into the guide pipe or pulled out of the guide pipe; and the detection device is electrically connected with the detection probe, provides an alternating current signal for the detection probe, collects corresponding impedance data, and determines the defect position of the liquid hydrogen storage and transportation equipment according to the impedance data. Eddy current detection is carried out on the outer surface of the equipment, the equipment cannot be scratched under the protection of paint, and protection on the equipment in the eddy current detection process is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of material detection, and in particular to an eddy current detection system for liquid hydrogen storage and transportation equipment. Background Art

[0002] In the process of liquid hydrogen production, storage and transportation, tube bundle trucks and liquid hydrogen tanks are needed. Liquid hydrogen tanks are located in production enterprises and filling stations and are used to store liquid hydrogen under appropriate pressure, while tube bundle trucks are used to transport liquid hydrogen from production enterprises to filling stations. As special equipment, liquid hydrogen tanks and gas cylinders on tube bundle trucks need to be inspected regularly to determine whether there are any unsafe factors. Since liquid hydrogen tanks and gas cylinders are under high pressure for a long time, it is inevitable that internal cracks, surface depressions and other structural defects will occur as the use time increases. These defects are difficult to detect with naked eye observation alone, so professional testing equipment is needed.

[0003] At present, the main inspection technologies for liquid hydrogen storage and transportation equipment include ultrasonic inspection, magnetic particle inspection and eddy current inspection. Ultrasonic inspection needs to be carried out in a special environment and is relatively cumbersome to operate. Magnetic particle inspection is a contact inspection and has a safety impact on liquid hydrogen storage and transportation equipment. Eddy current inspection has no special requirements for the environment and is a non-contact inspection, so it has been widely used.

[0004] However, many systems that currently use eddy current detection technology mostly perform detection on the inner surface of liquid hydrogen storage and transportation equipment. This detection method will inevitably cause the detection probe to contact the inner surface of the equipment, which in turn causes scratches and other impacts, resulting in unnecessary losses. Summary of the invention

[0005] The embodiment of the present application provides an eddy current detection system for liquid hydrogen storage and transportation equipment, which is used to solve the problem in the prior art that detection on the inner surface of the equipment may affect safety.

[0006] The embodiment of the present application provides an eddy current detection system for liquid hydrogen storage and transportation equipment, including:

[0007] A guide pipe, spirally wound on the outer surface of the liquid hydrogen storage and transportation equipment, wherein the guide pipe is a hollow structure;

[0008] A detection component, comprising a flexible board and a detection probe, wherein the detection probe is fixedly arranged on one side of the flexible board;

[0009] A driving device, through which the detection component passes, and the driving device is used to drive the detection component forward or backward so that the detection component is inserted into the guide tube or withdrawn from the guide tube;

[0010] A detection device is electrically connected to the detection probe, and the detection device provides an AC signal to the detection probe and collects corresponding impedance data, and determines the defect location of the liquid hydrogen storage and transportation equipment according to the impedance data.

[0011] In a possible implementation, the width of the flexible board is greater than the width of the detection probe, the detection probe is installed behind the flexible board at a certain distance from the edge of the flexible board, an upper driving wheel and a lower driving wheel parallel to each other are rotatably arranged inside the driving device, the upper driving wheel contacts the side of the flexible board facing away from the detection probe, the lower driving wheel contacts the side edge of the flexible board having the detection probe, and the upper driving wheel rotates driven by the motor, thereby driving the flexible board and the detection probe to move.

[0012] In a possible implementation, the axes of the upper driving wheel and the lower driving wheel are respectively provided with an upper rotating shaft and a lower rotating shaft, and the upper rotating shaft and the lower rotating shaft are respectively coaxially provided with an upper gear and a lower gear, and the upper gear and the lower gear are meshed.

[0013] In a possible implementation, the guide tube is opened on the side facing the outer surface of the liquid hydrogen storage and transportation equipment, and a slot is provided on the inner side of the guide tube at a position away from the liquid hydrogen storage and transportation equipment, the edge of the flexible plate is inserted into the slot, and the flexible plate slides in the slot.

[0014] In a possible implementation, the detection probe is located on the side of the flexible plate facing the liquid hydrogen storage and transportation equipment, and the distance between the flexible plate and the liquid hydrogen storage and transportation equipment is the same as the height of the detection probe.

[0015] In a possible implementation manner, a roller is provided on an inner side surface of the slot, and a portion of the flexible board inserted into the slot contacts the roller.

[0016] In a possible implementation, after collecting the impedance data, the detection device corrects the impedance data according to the thickness of the paint on the outer surface of the liquid hydrogen storage and transportation equipment.

[0017] In a possible implementation, after collecting the impedance data, the detection device corrects the impedance data according to the material of the paint on the outer surface of the liquid hydrogen storage and transportation equipment.

[0018] In a possible implementation, while the driving device drives the detection assembly to be inserted into the guide tube or to be pulled out from the guide tube, the detection device detects the defective position of the liquid hydrogen storage and transportation equipment.

[0019] In a possible implementation, the flexible board is provided with a plurality of detection probes along the length direction, and the detection device controls the operation of different detection probes respectively according to the speed at which the driving device drives the detection component to move, so that the detection areas of the plurality of detection probes cover the entire liquid hydrogen storage and transportation equipment.

[0020] The eddy current detection system for liquid hydrogen storage and transportation equipment in this application has the following advantages:

[0021] After the guide tube is set on the outer surface of the equipment, the flexible plate with multiple detection probes installed can be wrapped around the outer surface of the equipment, and then the eddy current detection of the equipment is performed during the movement of the detection probe. The paint on the outer surface of the equipment will not scratch the equipment, which effectively improves the protection of the equipment during the eddy current detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of an eddy current detection system for liquid hydrogen storage and transportation equipment provided in an embodiment of the present application.

[0024] Figure 2 A schematic diagram of the structure in which the flexible board and the detection probe provided in the embodiment of the present application are located inside the guide tube.

[0025] Figure 3 A schematic diagram of the connection structure between the flexible board and the detection probe provided in an embodiment of the present application.

[0026] Figure 4 A schematic diagram of the driving structure of the flexible board inside the driving device provided in an embodiment of the present application.

[0027] Explanation of the accompanying drawings: 100, liquid hydrogen storage and transportation equipment; 110, guide tube; 200, driving device; 201, upper driving wheel; 202, lower driving wheel; 203, upper rotating shaft; 204, lower rotating shaft; 205, upper gear; 206, lower gear; 210, detection component; 211, flexible board; 212, detection probe. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] Figure 1-4 A schematic diagram of the structure of an eddy current detection system for liquid hydrogen storage and transportation equipment provided in an embodiment of the present application. An embodiment of the present application provides an eddy current detection system for liquid hydrogen storage and transportation equipment, including:

[0030] The guide tube 110 is spirally wound on the outer surface of the liquid hydrogen storage and transportation equipment 100, and the guide tube 110 is a hollow structure;

[0031] The detection component 210 includes a flexible board 211 and a detection probe 212, wherein the detection probe 212 is fixedly disposed on one side of the flexible board 211;

[0032] A driving device 200, wherein the detection assembly 210 passes through the driving device 200, and the driving device 200 is used to drive the detection assembly 210 forward or backward so that the detection assembly 210 is inserted into the guide tube 110 or withdrawn from the guide tube 110;

[0033] The detection device is electrically connected to the detection probe 212. The detection device provides an AC signal to the detection probe 212, collects corresponding impedance data, and determines the defect location of the liquid hydrogen storage and transportation equipment 100 according to the impedance data.

[0034] Exemplarily, the liquid hydrogen storage and transportation equipment 100 is a vertical or horizontal cylindrical tank, which is usually made of metal. The guide tube 110 wrapped around the outer surface of the liquid hydrogen storage and transportation equipment 100 is preferably made of a soft material, for example, it can be made of silicone rubber. After the guide tube 110 wraps around the entire outer surface of the liquid hydrogen storage and transportation equipment 100, the guide tube 110 not only guides the detection component 210, but also provides protection for the outer surface of the liquid hydrogen storage and transportation equipment 100, so that when multiple liquid hydrogen storage and transportation equipment 100 are close to each other, the soft guide tube 110 can play a protective role.

[0035] The flexible plate 211 in the detection assembly 210 needs to have the characteristics of flexibility in the thickness direction and rigidity in the length direction, and preferably a thin steel sheet can be used. After the thin steel sheet is used, it can bend in the thickness direction after being inserted into the guide tube 110, so as to adapt to the direction of the guide tube 110 and be wound around the outer surface of the liquid hydrogen storage and transportation equipment 100, and at the same time, it can slide inside the guide tube 110 in the length direction under the traction of the driving device 200, so that the detection probe 212 can detect all positions of the liquid hydrogen storage and transportation equipment 100.

[0036] When the detection component 210 slides inside the guide tube 110, there will be friction with the liquid hydrogen storage and transportation equipment 100. Although the friction at a single point is not large, as the contact area between the detection component 210 and the outer surface of the liquid hydrogen storage and transportation equipment 100 increases, the friction will inevitably increase to a certain extent, which will affect the normal operation of the drive device 200, and even cause the detection component 210 to be unable to continue to be inserted into the guide tube 110, or unable to be pulled out of the guide tube 110. In order to avoid this situation, the present application spirally wraps multiple guide tubes 110 side by side on the outer surface of the liquid hydrogen storage and transportation equipment 100, which can greatly shorten the length of a single guide tube 110, thereby reducing the contact area between the detection component 210 and the liquid hydrogen storage and transportation equipment 100 in the guide tube 110, thereby achieving the effect of reducing friction. After multiple guide tubes 110 are provided, multiple detection components 210 need to be used accordingly. One detection component 210 is inserted into each guide tube 110 , and multiple detection components 210 are simultaneously inserted into the corresponding guide tube 110 , or pulled out from the guide tube 110 .

[0037] Furthermore, due to the limitation of the space near the liquid hydrogen storage and transportation equipment 100, it may not be possible to place the driving device 200 close to the guide tube 110, which will cause a portion of the detection assembly 210 to be exposed to the outside. In order to prevent the exposed detection assembly 210 from being unable to be inserted into the guide tube 110 due to lack of guidance, the embodiment of the present application also provides a hard guide tube on the outside of the driving device 200, the end of which is in close contact with the entrance of the guide tube 110, and the detection assembly 210 extending from the driving device 200 can be smoothly inserted into the guide tube 110 after being guided by the guide tube, without being accumulated outside the driving device 200.

[0038] The detection device is connected to each detection probe 212 on the flexible board 211 through a wire, and the wire includes a power line and a signal line. The wire is bonded to the flexible board 211 and inserted into the guide tube 110 together with the flexible board 211. The detection device controls the power line to provide a low-frequency AC signal to the detection probe 212 after it is turned on. The coil in the detection probe 212 generates an alternating magnetic field under the action of the low-frequency AC signal. The liquid hydrogen storage and transportation equipment 100 made of metal will generate eddy currents under the action of the alternating magnetic field, and the eddy currents will cause the liquid hydrogen storage and transportation equipment 100 to generate a corresponding magnetic field at the detection position. The magnetic field will affect the coil in the detection probe 212, specifically, it will cause the change of the coil impedance. The detection device analyzes the impedance data to determine whether there are structural defects such as cracks and depressions at the current detection position. The current position of the detection probe 212 on the liquid hydrogen storage and transportation equipment 100 can be determined by combining the speed at which the drive device 200 drives the detection component 210 to move and the total moving time, which is the defect position.

[0039] In a possible embodiment, the width of the flexible plate 211 is greater than the width of the detection probe 212. The detection probe 212 is installed behind the flexible plate 211 at a certain distance from the edge of the flexible plate 211. The driving device 200 is internally provided with an upper driving wheel 201 and a lower driving wheel 202 which are parallel to each other. The upper driving wheel 201 contacts the side of the flexible plate 211 facing away from the detection probe 212, and the lower driving wheel 202 contacts the side edge of the flexible plate 211 having the detection probe 212. The upper driving wheel 201 rotates driven by the motor, thereby driving the flexible plate 211 and the detection probe 212 to move.

[0040] Exemplarily, the upper driving wheel 201 and the lower driving wheel 202 can both be made of rubber, and the upper driving wheel 201 and the lower driving wheel 202 sandwich the flexible plate 211 in the middle. When the upper driving wheel 201 rotates under the drive of the motor located inside the driving device 200, the flexible plate 211 can be driven to move through the action of friction, and at this time the lower driving wheel 202 will also rotate.

[0041] Furthermore, an upper rotating shaft 203 and a lower rotating shaft 204 are respectively disposed on the axis of the upper driving wheel 201 and the lower driving wheel 202 , and an upper gear 205 and a lower gear 206 are respectively coaxially disposed on the upper rotating shaft 203 and the lower rotating shaft 204 , and the upper gear 205 and the lower gear 206 are meshed.

[0042] Specifically, one end of the upper rotating shaft 203 is rotatably plugged into the inner side of the housing of the driving device 200, and the other end is connected to the driving shaft of the motor, while both ends of the lower rotating shaft 204 are rotatably plugged into the inner side of the housing of the driving device 200. Driven by the gears, the upper driving wheel 201 and the lower driving wheel 202 will rotate synchronously in opposite directions, thereby synchronously driving the detection component 210 to move.

[0043] In the embodiment of the present application, the length of the detection assembly 210 should be greater than the length of the guide tube 110, so that after the guide tube 110 is completely filled with the detection assembly 210, a portion of the detection assembly 210 is still in the driving device 200. The detection assembly 210 in the embodiment of the present application does not need to be wound in the driving device 200, but passes through the driving device 200. Before being inserted into the guide tube 110, most of the detection assembly 210 will be piled up in a sufficiently large area so that the wire at the end of the detection assembly 210 does not rotate, thereby improving the stability of the connection between the wire and the detection device.

[0044] In a possible embodiment, the guide tube 110 is opened on the side facing the outer surface of the liquid hydrogen storage and transportation equipment 100, and a slot is provided on the inner side of the guide tube 110 at a position away from the liquid hydrogen storage and transportation equipment 100, the edge of the flexible plate 211 is inserted into the slot, and the flexible plate 211 slides in the slot.

[0045] For example, since the outer surface of the liquid hydrogen storage and transportation equipment 100 is painted, the detection probe 212 will not cause scratches when it contacts the outer surface under the drive of the flexible plate 211. After the slot is set, the distance between the detection probe 212 and the outer surface of the liquid hydrogen storage and transportation equipment can be controlled, and the detection result will not be inaccurate due to a large change in the distance.

[0046] Furthermore, the detection probe 212 is located on the side of the flexible plate 211 facing the liquid hydrogen storage and transportation equipment 100, and the distance between the flexible plate 211 and the liquid hydrogen storage and transportation equipment 100 is the same as the height of the detection probe 212. With this position setting, the detection probe 212 can be in contact with the outer surface of the liquid hydrogen storage and transportation equipment 100, and the paint on the outer surface of the liquid hydrogen storage and transportation equipment 100 will not be damaged due to excessive contact force.

[0047] Furthermore, a roller is provided on the inner side of the slot, and the portion of the flexible plate 211 inserted into the slot contacts the roller. The roller is preferably provided on the side of the slot close to and facing away from the liquid hydrogen storage and transportation equipment 100 to reduce the friction between the flexible plate 211 and the guide tube 110.

[0048] In a possible embodiment, after collecting the impedance data, the detection device corrects the impedance data according to the thickness and material of the paint on the outer surface of the liquid hydrogen storage and transportation equipment 100.

[0049] For example, although the presence of paint does not have a significant impact on eddy current detection, in order to maximize the accuracy of the detection results, the present application also collects paint thickness and material data before detection, and then uses these data to correct the impedance data to restore the accurate impedance data when no paint is present, thereby obtaining accurate detection results.

[0050] In a possible embodiment, when the driving device 200 drives the detection assembly 210 to insert into the guide tube 110 or to withdraw from the guide tube 110 , the detection device detects the defect position of the liquid hydrogen storage and transportation equipment 100 .

[0051] Exemplarily, since the detection probe 212 indicates a small number, if the entire liquid hydrogen storage and transportation equipment 100 is to be covered, the detection probe 212 needs to be moved across the entire outer surface of the liquid hydrogen storage and transportation equipment 100. During the movement of the detection component 210, the detection device can control the detection probe 212 to work, so as to gradually complete the detection work of the liquid hydrogen storage and transportation equipment 100.

[0052] Furthermore, the flexible board 211 is provided with a plurality of detection probes 212 along the length direction, and the detection device controls different detection probes 212 to work according to the speed at which the driving device 200 drives the detection component 210 to move, so that the detection areas of the plurality of detection probes 212 cover the entire liquid hydrogen storage and transportation equipment 100.

[0053] Specifically, when multiple detection probes 212 are arranged on the same flexible plate 211 and multiple guide tubes 110 are arranged on the liquid hydrogen storage and transportation equipment 100, the operations of two adjacent detection probes 212 in the length direction and the width direction of the flexible plate 211 may affect each other. In order to reduce this influence, the detection device of the present application controls each detection probe 212 separately so that the two adjacent detection probes 212 will not work at the same time. After one detection probe 212 stops working, the adjacent detection probe 212 starts working, thereby ensuring that all detection probes 212 can detect all positions of the liquid hydrogen storage and transportation equipment 100 during movement while reducing the mutual images of the detection probes 212.

[0054] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0055] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An eddy current detection system for liquid hydrogen storage and transportation equipment, characterized in that: include: A guide tube (110) is spirally wound on the outer surface of the liquid hydrogen storage and transportation equipment (100), and the guide tube (110) is a hollow structure; A detection component (210) comprises a flexible board (211) and a detection probe (212), wherein the detection probe (212) is fixedly arranged on a side surface of the flexible board (211); a driving device (200), the detection component (210) passing through the driving device (200), and the driving device (200) being used to drive the detection component (210) forward or backward so that the detection component (210) is inserted into the guide tube (110) or withdrawn from the guide tube (110); A detection device is electrically connected to the detection probe (212), wherein the detection device provides an AC signal to the detection probe (212), collects corresponding impedance data, and determines a defect location of the liquid hydrogen storage and transportation equipment (100) based on the impedance data.

2. The eddy current detection system for liquid hydrogen storage and transportation equipment according to claim 1, characterized in that: The width of the flexible plate (211) is greater than the width of the detection probe (212); after the detection probe (212) is installed on the flexible plate (211), there is a certain distance between it and the edge of the flexible plate (211); an upper driving wheel (201) and a lower driving wheel (202) parallel to each other are rotatably arranged inside the driving device (200); the upper driving wheel (201) contacts the side of the flexible plate (211) facing away from the detection probe (212); the lower driving wheel (202) contacts the side edge of the flexible plate (211) having the detection probe (212); the upper driving wheel (201) rotates under the drive of the motor, thereby driving the flexible plate (211) and the detection probe (212) to move.

3. The eddy current detection system for liquid hydrogen storage and transportation equipment according to claim 2 is characterized in that: An upper rotating shaft (203) and a lower rotating shaft (204) are respectively arranged at the axis of the upper driving wheel (201) and the lower driving wheel (202); an upper gear (205) and a lower gear (206) are respectively coaxially arranged on the upper rotating shaft (203) and the lower rotating shaft (204); the upper gear (205) and the lower gear (206) are meshed.

4. The eddy current detection system for liquid hydrogen storage and transportation equipment according to claim 2 is characterized in that: The guide tube (110) is opened on the side facing the outer surface of the liquid hydrogen storage and transportation equipment (100), and the inner side of the guide tube (110) is provided with a slot at a position away from the liquid hydrogen storage and transportation equipment (100), the edge of the flexible plate (211) is inserted into the slot, and the flexible plate (211) slides in the slot.

5. The eddy current detection system for liquid hydrogen storage and transportation equipment according to claim 4, characterized in that: The detection probe (212) is located on the side of the flexible plate (211) facing the liquid hydrogen storage and transportation equipment (100), and the distance between the flexible plate (211) and the liquid hydrogen storage and transportation equipment (100) is the same as the height of the detection probe (212).

6. The eddy current detection system for liquid hydrogen storage and transportation equipment according to claim 4, characterized in that: A roller is arranged on the inner side surface of the slot, and the portion of the flexible board (211) inserted into the slot contacts the roller.

7. The eddy current detection system for liquid hydrogen storage and transportation equipment according to claim 1, characterized in that: After collecting the impedance data, the detection device corrects the impedance data according to the thickness of the paint on the outer surface of the liquid hydrogen storage and transportation equipment (100).

8. The eddy current detection system for liquid hydrogen storage and transportation equipment according to claim 1, characterized in that: After collecting the impedance data, the detection device corrects the impedance data according to the material of the paint on the outer surface of the liquid hydrogen storage and transportation equipment (100).

9. The eddy current detection system for liquid hydrogen storage and transportation equipment according to claim 1, characterized in that: During the process in which the driving device (200) drives the detection component (210) to be inserted into the guide tube (110) or to be withdrawn from the guide tube (110), the detection device detects the defect position of the liquid hydrogen storage and transportation equipment (100).

10. The eddy current detection system for liquid hydrogen storage and transportation equipment according to claim 9, characterized in that: The flexible plate (211) is provided with a plurality of detection probes (212) along the length direction, and the detection device controls different detection probes (212) to work respectively according to the speed at which the detection component (210) is driven by the driving device (200) to move, so that the detection areas of the plurality of detection probes (212) cover the entire liquid hydrogen storage and transportation equipment (100).

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