Device and method for detecting high-voltage cable defects based on X-ray tube voltage gradation

Abstract

The present invention relates to the technical field of X-ray high-voltage power cables, specifically a device for detecting high-voltage cable defects based on X-ray tube voltage grading variation, comprising a workbench and a cable, a detection auxiliary component provided on the workbench, the detection auxiliary component including a mounting component movably connected to the workbench, an X-ray detector fixedly connected to one side of the workbench, a system controller provided on the workbench, and an X-ray grading detection component provided on the workbench. The device for detecting high-voltage cable defects based on X-ray tube voltage grading variation improves the service life of the detection device by installing and disassembling the detection device and dissipating heat. This patent adopts X-ray tube voltage grading variation to perform image recognition on detection sequence images, thereby improving the imaging quality and recognition capability of X-ray detection, and realizing X-ray intensity grading variation to detect internal defects of high-voltage cables.

Description

Technical Field

[0001] The present invention relates to the technical field of X-ray high-voltage power cables, and in particular to a device for detecting defects in high-voltage cables based on graded variation of X-ray tube voltage. Background Art

[0002] The cabling rate of urban power grids continues to rise, and the dense laying of high-voltage cables of various voltage levels in the same channel has increasingly stringent requirements for safe operation. Existing tests cannot effectively detect defects inside the cables during the handover and operation stages, and there is a lack of a simple and rapid on-site detection and defect assessment method. Currently, X-ray non-destructive testing has become the first choice for internal defect detection of high-voltage cables. High-voltage cables are composed of an outer sheath, corrugated aluminum sheath, buffer layer, semi-conductive insulation shield, insulation layer, conductor shield, and conductive core with a coaxial layered structure. Due to the complex internal structure of the cable, the tube voltage of the X-ray machine is set high during detection, which is prone to overexposure and loss of information on low-density materials.

[0003] Currently, low tube current and tube voltage will result in insufficient penetration of radiation, which is prone to underexposure, resulting in poor imaging resolution and inability to detect; overexposure and underexposure will both lose spatial information. At the same time, since the cable is composed of materials of various densities, when a single X-ray imaging is used to detect the entire structure, there will be coexistence of low grayscale and grayscale saturation in a radiographic image. Therefore, the detection requires manual repeated adjustment of the tube voltage and tube current of the X-ray machine to meet the X-ray intensity during detection and obtain a better image. The detection process is time-consuming, the work efficiency is low, and the measurement results vary depending on the technical experience of the operator. In addition, it is inconvenient to install and disassemble the detection device during detection, and it is inconvenient to dissipate heat during inspection. Summary of the Invention

[0004] In response to the deficiencies in the prior art, the present invention provides a device for detecting defects in high-voltage cables based on a graded variation of an X-ray tube voltage. The device has the advantages of convenient detection and adjustment, and solves the problem that currently lower tube current and tube voltage will result in insufficient penetration of rays, which easily leads to underexposure and poor imaging resolution and inability to detect; overexposure and underexposure will both lose spatial information. At the same time, since the cable is composed of materials of various densities, when a single X-ray imaging is used to detect the entire structure, there is also a coexistence of low grayscale and grayscale saturation in a transillumination image. Therefore, the detection requires manual repeated adjustment of the tube voltage, tube current, etc. of the X-ray machine to meet the X-ray intensity emitted during detection and obtain a better image. The detection process is time-consuming, the work efficiency is low, and the measurement results vary depending on the technical experience of the operator. In addition, it is inconvenient to install and disassemble the detection device during detection, and it is inconvenient to dissipate heat during inspection.

[0005] To achieve the above-mentioned purpose of convenient detection and adjustment, the present invention provides the following technical solution: a device for detecting defects in high-voltage cables based on graded variation of X-ray tube voltage, comprising a workbench and a cable, wherein a detection auxiliary component is provided on the workbench;

[0006] The detection auxiliary component includes a mounting component movably connected to the workbench, an X-ray detector is fixedly connected to one side of the workbench, a system controller is arranged on the workbench, and an X-ray graded detection component is arranged on the workbench.

[0007] Furthermore, the mounting assembly includes an X-ray machine, the bottom of which is fixedly connected to a mounting plate, the interior of the workbench is fixedly connected to a fixed cylinder, the interior of the fixed cylinder is movably connected to a pull rod, a spring is mounted on the outside of the pull rod, and the left side of the pull rod is fixedly connected to a clamping rod that is clamped to the mounting plate.

[0008] Furthermore, a card slot is provided on the right side of the mounting plate, and the card rod is card-connected with the mounting plate through the card slot.

[0009] Furthermore, the X-ray grading detection component includes a mounting plate, the front side of the mounting plate is fixedly connected to the X-ray grading detection software, both sides of the workbench are fixedly connected to the mounting box, the interior of the mounting box is fixedly connected to the slide rail, and the outer side of the slide rail is slidably connected to the fan.

[0010] Furthermore, heat dissipation holes are provided on a side of the workbench close to the installation box, and the heat dissipation holes are evenly distributed on the workbench.

[0011] Furthermore, a mounting groove is provided on the top of the workbench, and the mounting plate is movably connected to the workbench through the mounting groove.

[0012] A method for detecting high-voltage cable defects based on a stepwise variation of an X-ray tube voltage comprises the following steps:

[0013] (1) Install the above-mentioned device as required, start the X-ray grading detection software through the computer of the system controller, and limit the recommended preset exposure X-ray tube voltage to a certain range according to the voltage level of the tested cable, with each level being 2kV from high to low;

[0014] (2) The preset tube voltage gradient parameters are transmitted to the wireless controller to operate the X-ray machine and perform gradient graded X-ray detection of the tested cable;

[0015] (3) The X-ray detector obtains the X-ray information that penetrates the inspected cable from the X-ray machine, and transmits the digital imaging information data back to the system controller;

[0016] (4) The system controller receives the image information data of the graded variable energy X-ray detection sequence and screens and processes the detection images through the X-ray graded detection software;

[0017] (5) Defect identification is performed based on the screened images, and the final images are stored and displayed.

[0018] Compared with the prior art, the present invention provides a device for detecting high-voltage cable defects based on the graded variation of X-ray tube voltage, which has the following beneficial effects:

[0019] The device for detecting defects in high-voltage cables based on graded variation of X-ray tube voltage improves the service life of the detection device by installing and disassembling the detection device and dissipating heat, and solves the problem that currently low tube current and tube voltage will result in insufficient penetration of rays, which is prone to underexposure and leads to poor imaging resolution and inability to detect; overexposure and underexposure will both lose spatial information, and at the same time, because the cable is composed of materials of various densities, when a single X-ray imaging is used to detect the entire structure, there is also a coexistence of low grayscale and grayscale saturation in a transillumination image. Therefore, the detection requires manual repeated adjustment of the tube voltage and tube current of the X-ray machine to meet the X-ray emission intensity during detection and obtain a better image. The detection process is time-consuming, the work efficiency is low, and the measurement results vary depending on the different technical experience of the operators. In addition, it is inconvenient to install and disassemble the detection device during detection, and it is inconvenient to dissipate heat during inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the main view of the structure of the present invention;

[0021] Figure 2 This is an enlarged view of the new structure of the practical X-ray grading detection component;

[0022] Figure 3 The schematic diagram of the X-ray machine is shown below;

[0023] Figure 4 This is the schematic diagram of the X-ray detector;

[0024] Figure 5 This is the schematic diagram of the X-ray detection system controller;

[0025] Figure 6 This is a flow chart for voltage-graded X-ray detection of internal defects in high-voltage cables.

[0026] In the figure: 1 workbench, 2 mounting assembly, 201 X-ray machine, 202 clamping plate, 203 fixing tube, 204 pull rod, 205 clamping rod, 3 X-ray detector, 4 system controller, 5 X-ray graded detection assembly, 501 mounting plate, 502 X-ray graded detection software, 503 mounting box, 504 slide rail, 505 fan. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figure 1-6 The device for detecting defects in high-voltage cables based on the graded variation of the voltage of an X-ray tube comprises a workbench 1 and a cable 6, wherein the workbench 1 is provided with a detection auxiliary component.

[0029] The detection auxiliary component includes an installation component 2 movably connected to the workbench 1, and the installation component 2 includes an X-ray machine 201. The bottom of the X-ray machine 201 is fixedly connected to a clamping plate 202, and the interior of the workbench 1 is fixedly connected to a fixed cylinder 203. The interior of the fixed cylinder 203 is movably connected to a pull rod 204. A spring 206 is sleeved on the outer side of the pull rod 204. The left side of the pull rod 204 is fixedly connected to a clamping rod 205 clamped with the clamping plate 202. A clamping slot is provided on the right side of the clamping plate 202, and the clamping rod 205 is clamped with the clamping plate 202 through the clamping slot, so that the X-ray machine 201 can be installed and positioned by positioning the clamping plate 202 when in use, and the X-ray machine 201 can be disassembled when not in use. A mounting slot is provided on the top of the workbench 1, and the clamping plate 202 is movably connected to the workbench 1 through the mounting slot, so that the clamping plate 202 can be conveniently clamped when in use. 202 is installed on the workbench 1 through the mounting slot, an X-ray detector 3 is fixedly connected to one side of the workbench 1, a system controller 4 is provided on the workbench 1, an X-ray graded detection component 5 is provided on the workbench 1, the X-ray graded detection component 5 includes a mounting plate 501, the front side of the mounting plate 501 is fixedly connected to the X-ray graded detection software 502, both sides of the workbench 1 are fixedly connected to the mounting box 503, the interior of the mounting box 503 is fixedly connected to the slide rail 504, the outer side of the slide rail 504 is slidably connected to the fan 505, which is convenient for dissipating heat of the X-ray graded detection software 502 through the fan 506 when in use, and a heat dissipation hole is opened on the side of the workbench 1 close to the mounting box 503, and the heat dissipation holes are evenly distributed on the workbench 1, which is convenient for dissipating heat of the X-ray graded detection software 502 through the fan 506 when in use.

[0030] In this embodiment, a method and apparatus for improving the quality and capability of X-ray defect detection for high-voltage power cables are provided, including: an X-ray machine 201, an X-ray detector 3, an X-ray detector 3, a workbench 1, and high-voltage cable X-ray graded detection software 502. The X-ray defect detection method for high-voltage cables is to adjust the tube voltage of the X-ray tube from high to low to decrease exposure imaging, obtain a series of X-ray detection images of the same part of the cable, and select the best grayscale and resolution images of different regions of the cable for different material regions to determine whether there are defects. The density of the cross-linked polyethylene material of the cable main material is 0.93g / cm3, the copper density of the cable conductor is 8.89g / cm3, and the buffer layer defect density is 3.50-3.90g / cm3. The setting range of the X-ray tube voltage during detection is based on different voltage levels of the tested cable, different structural dimensions, and experimental detection statistical recommended values, as shown in the table below.

[0031]

[0032]

[0033] The X-ray machine 201 includes a built-in battery, an X-ray tube, a modulated high-voltage power supply, a modulated filament power supply, a wireless communication module, and an X-ray voltage control module. It emits X-rays required for non-destructive testing under the control of the X-ray detector 3. The X-ray detector 3 receives the penetrating X-rays emitted by the X-ray machine 201 on the device under inspection and performs digital imaging. It includes a waveguide conversion screen, an optical coupling module, a CMOS imaging array module, a readout circuit, a wireless communication module, and a built-in battery. The X-ray detector 3 is composed of a computer, a controller, a wireless communication module, and a working unit equipped with the X-ray graded detection software 502 with X-ray detection, material, image processing and storage functions. The power supply structure is as follows: the X-ray detector 3 controls the X-ray machine 201 to emit X-rays of corresponding energy through the X-ray hierarchical detection software. The X-ray detector 3 records its detection information and transmits it back to the X-ray detector 3. The X-ray hierarchical detection software 502 processes the X-ray detection image to display the structure of the device under test and any defects. The workbench 1 is a bracket for installing the X-ray machine 201 and the X-ray detector 3 on the cable under test, and X-ray non-destructive testing is performed on the cross-linked polyethylene insulated high-voltage cable. The X-ray hierarchical detection software 502 is an X-ray hierarchical detection software 502 with the functions of controlling X-ray detection operations, measurements, image processing and storage.

[0034] A method for detecting high-voltage cable defects based on a stepwise variation of an X-ray tube voltage comprises the following steps:

[0035] 1. Start the X-ray grading detection software through the computer of the X-ray detector 3. According to the voltage level of the tested cable, the recommended preset exposure X-ray tube voltage is limited to a certain range, with each level changing from high to low by 2kV;

[0036] 2. The preset tube voltage gradient parameters are transmitted to the wireless controller to operate and control the X-ray machine 201 to perform gradient and graded X-ray detection of the tested cable;

[0037] 3. The X-ray detector 3 obtains the X-ray information that is irradiated by the X-ray machine 201 and penetrates the inspected cable, and the digital imaging information data is transmitted back to the X-ray detector 3;

[0038] 4. The X-ray detector 3 receives the image information data of the graded variable energy X-ray detection sequence, and screens and processes the detection images through the X-ray graded detection software 502;

[0039] 5. Defect identification is performed based on the screened images, and the final images are stored and displayed.

[0040] The beneficial effects are as follows: a method for improving the ability of X-ray on-site detection of defects in high-voltage power cables, which adopts the method of adjusting the tube voltage of the X-ray tube from high to low to reduce the exposure imaging, obtains a series of X-ray detection images of the same part of the cable, and selects the best grayscale and resolution images of different areas of the cable for different material areas to determine whether there are defects inside the high-voltage cable, providing effective methods and means for cable operation, maintenance and management.

[0041] When this embodiment is in use, the slide rail 504 is started to drive the fan 505 to move up and down to dissipate heat from the X-ray grading detection software 502, thereby increasing the service life of the device. Moreover, when installing the X-ray machine 201, the spring 206 is squeezed by pulling the pull rod 204 to drive the clamping rod 205 to fix the clamping plate 202, thereby fixing the X-ray machine 201 on the workbench 1, and the pull rod 204 is pulled to facilitate the removal of the X-ray machine 201.

[0042] The beneficial effects of the above embodiments are:

[0043] The device for detecting defects in high-voltage cables based on graded variation of X-ray tube voltage improves the service life of the detection device by installing and disassembling the detection device and dissipating heat, and solves the problem that currently low tube current and tube voltage will result in insufficient penetration of rays, which is prone to underexposure and leads to poor imaging resolution and inability to detect; overexposure and underexposure will both lose spatial information, and at the same time, because the cable is composed of materials of various densities, when a single X-ray imaging is used to detect the entire structure, there is also a coexistence of low grayscale and grayscale saturation in a transillumination image. Therefore, the detection requires manual repeated adjustment of the tube voltage and tube current of the X-ray machine to meet the X-ray emission intensity during detection and obtain a better image. The detection process is time-consuming, the work efficiency is low, and the measurement results vary depending on the different technical experience of the operators. In addition, it is inconvenient to install and disassemble the detection device during detection, and it is inconvenient to dissipate heat during inspection.

[0044] The electrical components appearing in this article are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device that controls a computer, etc., and the existing public power connection technology is not described in detail in this article.

[0045] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0046] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting defects in high-voltage cables based on a stepwise variation of an X-ray tube voltage, comprising a workbench (1) and a cable (6), characterized in that: The workbench (1) is provided with a detection auxiliary component; The detection auxiliary component comprises a mounting component (2) movably connected to the workbench (1), an X-ray detector (3) is fixedly connected to one side of the workbench (1), a system controller (4) is provided on the workbench (1), and an X-ray graded detection component (5) is provided on the workbench (1); The mounting assembly (2) includes an X-ray machine (201), the bottom of the X-ray machine (201) is fixedly connected to a clamping plate (202), the interior of the workbench (1) is fixedly connected to a fixed cylinder (203), the interior of the fixed cylinder (203) is movably connected to a pull rod (204), the outer side of the pull rod (204) is sleeved with a spring (206), and the left side of the pull rod (204) is fixedly connected to a clamping rod (205) clamped to the clamping plate (202); The X-ray graded detection component (5) comprises a mounting plate (501), the front side of the mounting plate (501) is fixedly connected to the X-ray graded detection software (502), both sides of the workbench (1) are fixedly connected to mounting boxes (503), the interior of the mounting box (503) is fixedly connected to a slide rail (504), and the outer side of the slide rail (504) is slidably connected to a fan (505); the X-ray detection method for high-voltage cable defects is to adjust the tube voltage of the X-ray tube from high to low to decrease exposure imaging, obtain a series of X-ray detection images of the same part of the cable, and select the best grayscale and resolution images of different regions for different material regions of the cable to determine whether there are defects.

2. The device for detecting high-voltage cable defects based on X-ray tube voltage gradient according to claim 1 is characterized in that: A card slot is provided on the right side of the card plate (202), and the card rod (205) is card-connected to the card plate (202) via the card slot.

3. The device for detecting high-voltage cable defects based on X-ray tube voltage gradient according to claim 1 is characterized in that: The workbench (1) is provided with heat dissipation holes on one side close to the installation box (503), and the heat dissipation holes are evenly distributed on the workbench (1).

4. The device for detecting high-voltage cable defects based on X-ray tube voltage gradient according to claim 1 is characterized in that: A mounting slot is provided on the top of the workbench (1), and the clamping plate (202) is movably connected to the workbench (1) via the mounting slot.

5. The method for detecting high-voltage cable defects based on X-ray tube voltage graded variation according to any one of claims 1 to 4, characterized in that: The following steps are involved: (1) Install the above-mentioned device as required, start the X-ray detection software through the computer of the system controller, and limit the recommended preset exposure X-ray tube voltage to a certain range according to the voltage level of the cable to be tested, with each level being 2kV from high to low; (2) The preset tube voltage gradient parameters are transmitted to the wireless controller to operate the X-ray machine and perform gradient graded X-ray detection of the tested cable; (3) The X-ray detector obtains the X-ray information that penetrates the inspected cable from the X-ray machine, and the digital imaging information data is sent back to the system controller; (4) The system controller receives the image information data of the graded variable energy X-ray detection sequence and screens and processes the detection images through the X-ray graded detection software; (5) Defects are identified based on the screened images, and the final images are stored and displayed.

Images