A cold cathode photon counting x-ray flaw detector

Abstract

The present application belongs to the technical field of pipeline flaw detection equipment, and particularly relates to a cold cathode photon counting X-ray flaw detector, which comprises a cold cathode X-ray flaw detector main body and a photon counting detector receiving equipment main body. The present application realizes integrated integration of the cold cathode X-ray source detection equipment and the photon counting detector receiving equipment, and the installation process of the cold cathode X-ray source flaw detection head and the photon counting plate assembly is simple, without the need for additional arrangement of a support. Moreover, the flaw detector has the function of automatic and accurate adjustment of the source distance of the cold cathode X-ray source flaw detection head and the detection distance of the photon counting plate assembly, and simultaneously has the function of automatic rotation and adjustment of the flaw detection position, thereby guaranteeing the comprehensiveness and reliability of the gas pipeline joint defect detection, reducing the gas pipeline joint defect detection process, improving the convenience and efficiency of the detection, and reducing the labor intensity of the workers.

Description

Technical Field

[0001] This invention belongs to the technical field of pipeline flaw detection equipment, and in particular relates to a cold cathode photon counting X-ray flaw detector. Background Technology

[0002] Existing polyethylene (PE) pipes, with their advantages of long service life, corrosion resistance, and good flexibility, have become the main conduit material for urban gas transmission and distribution networks, accounting for over 70% in new construction and renovation projects. Therefore, to ensure the safety of gas pipelines, according to the current CJJ63-2018 "Technical Standard for Polyethylene Gas Pipeline Engineering", the quality of polyethylene pipe joints must be inspected. This inspection requires the use of professional non-destructive testing equipment, and common methods include ultrasonic testing, microwave testing, terahertz testing, and X-ray testing. However, the acoustic impedance characteristics of polyethylene lead to poor signal-to-noise ratio and severe echo signal attenuation in phased array ultrasonic testing, resulting in significant defects in ultrasonic, microwave, and terahertz testing. Therefore, the mainstream non-destructive testing method relies on X-ray testing. This method, with its strong penetration ability and intuitive imaging effect, can clearly show harmful defects such as inclusions, pores, and incomplete penetration inside the joint, achieving the highest detection level. However, existing hot cathode X-ray testing equipment is bulky and difficult to adapt to the field working environment. At the same time, hot cathode X-ray sources also have problems such as continuous heating, large focal size, limited sensitivity, blurred images, and easy to miss small defects. Therefore, cold cathode X-ray source testing equipment is often used for polyethylene pipeline inspection. Cold cathode X-ray source testing equipment, combined with photon counting detection technology, can accurately and comprehensively detect defects at polyethylene pipeline joints.

[0003] However, the existing cold cathode X-ray detection technology still has significant shortcomings in practical applications: the cold cathode X-ray source detection equipment currently used for on-site detection of polyethylene pipe joints is equipped with a traditional scintillator X-ray detector. This device has a high detection rate for conventional inclusions, pores and other defects, but because the traditional scintillator X-ray detector converts X-ray photons into visible light, and then amplifies and photoelectrically converts the visible light, this process cannot avoid electronic noise interference and visible light afterglow crosstalk. Therefore, this device has poor detection capability for deep-level defects such as cold welding in polyethylene pipes. However, the cold cathode X-ray source emitting device, combined with the photon counting detector receiving device, increases the photon counting detector's ability to acquire energy spectrum information, thus improving the detection capability for deep-level defects. Moreover, the two are arranged separately. During the inspection process, the staff must first measure the actual diameter of the polyethylene pipe, and then calculate and determine the source distance parameters of the cold cathode X-ray source (i.e., the distance from the X-ray source to the outer wall of the gas pipe) and the detection distance parameters of the photon counting detector (i.e., the distance from the detector counting plate to the outer wall of the gas pipe) based on the pipe diameter parameters. Subsequently, the cold cathode X-ray source detection device and the photon counting detector must be positioned to the calculated detection positions using a special bracket. The above distance measurement and equipment positioning process all rely on manual operation, which is not only inefficient, but also prone to deviation of the source distance and detection distance from the optimal value due to operational errors. This directly affects the X-ray imaging quality and the accuracy of defect identification. Especially for cold welding defects with weak contrast, errors may lead to the risk of missed detection, making it difficult to guarantee the reliability of the inspection. In addition, the weld seam of polyethylene pipe joints is a ring structure. Traditional static single irradiation can only cover a local section of the weld seam and cannot achieve 360° full circumference inspection. In order to ensure the comprehensiveness of the inspection, it is necessary to inspect multiple positions along the outside of the pipe in multiple times. Moreover, each inspection requires repeatedly positioning the cold cathode X-ray source inspection equipment and photon counting detector to the calculated inspection position. This operation mode not only makes the entire inspection process extremely complicated, but also significantly reduces the convenience and efficiency of the inspection.

[0004] To address these issues, we propose a cold cathode photon counting X-ray flaw detector. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a cold cathode photon counting X-ray flaw detector.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a cold cathode photon counting X-ray flaw detector, comprising a cold cathode X-ray flaw detector body and a photon counting detector receiving device body, wherein the connection end of the cold cathode X-ray flaw detector body is electrically connected to a cold cathode X-ray source flaw detector head through an interface, and the input end of the photon counting detector receiving device body is electrically connected to a photon counting board assembly through an interface. The bottom end of the cold cathode X-ray source flaw detector is fixedly connected to an source distance adjustment mechanism; The outer wall of the photon counting board assembly is fixedly connected to a detection distance adjustment mechanism; The connection ends of the source distance adjustment mechanism and the detector distance adjustment mechanism are fixedly connected to the pipe outer diameter measuring mechanism. The main body of the cold cathode X-ray flaw detector and the main body of the photon counting detector receiving device are both fixedly connected to a first support plate at their bottom ends. A protective box is fixedly connected to the outer wall of the first support plate. A box cover is hinged to the top of the protective box. A touch display panel is fixedly connected to the inner wall of the box cover. An auxiliary mechanism is fixedly connected to the inner wall of the protective box.

[0007] In the aforementioned cold cathode photon counting X-ray flaw detector, the source distance adjustment mechanism includes an L-shaped strip fixedly connected to the bottom end of the cold cathode X-ray source flaw detector head. The top outer wall of the L-shaped strip has a fixing hole, and a first laser ranging sensor is fixedly connected to the inner wall of the fixing hole. A first multi-stage electric push rod is fixedly embedded at the bottom end of the L-shaped strip.

[0008] In the aforementioned cold cathode photon counting X-ray flaw detector, the detection distance adjustment mechanism includes a connecting plate fixedly connected to the outer wall of the photon counting plate assembly. The bottom outer wall of the connecting plate has a mounting hole, and a second laser ranging sensor is fixedly connected to the wall of the mounting hole. A second multi-stage electric push rod is fixedly embedded at the bottom of the connecting plate.

[0009] In the aforementioned cold cathode photon counting X-ray flaw detector, the pipe outer diameter measuring mechanism includes two L-shaped adjusting plates. The outer walls of the two L-shaped adjusting plates are fixedly connected to the moving ends of the first and second multi-stage electric push rods, respectively. A limiting sleeve is movably fitted onto the outer walls of the two L-shaped adjusting plates. Two threaded holes are formed on the outer wall of the limiting sleeve, and positioning bolts are threaded onto the walls of these holes. U-shaped blocks are fixedly connected to the outer walls of the two L-shaped adjusting plates on opposite sides. The top of the U-shaped blocks and... Each of the L-shaped adjustment plates has a through hole at its bottom, and a rotating rod is connected to the wall of the through hole via a rolling bearing. Two rotating rings are fixedly sleeved on the rod wall. Anti-slip hard rubber sleeves are fixedly connected to the outer wall of the rotating rings. A U-shaped frame is fixedly connected to the inner wall of one of the L-shaped adjustment plates. A third laser ranging sensor is fixedly connected to the inner wall of the fixing hole of the U-shaped frame. A correction measuring block that cooperates with the third laser ranging sensor is fixedly connected to the inner wall of the other L-shaped adjustment plate. A drive assembly is fixedly connected to the upper surface of one of the U-shaped blocks.

[0010] In the aforementioned cold cathode photon counting X-ray flaw detector, the drive assembly includes a U-shaped connecting frame fixedly connected to the upper surface of the U-shaped block and a micro drive motor. A micro gear reducer is fixedly embedded at the top of the U-shaped connecting frame. The output end of the micro drive motor is fixedly connected to the drive end of the micro gear reducer. The driven end of the micro gear reducer is fixedly connected to the top of the rotating rod. A PLC controller is fixedly connected to the upper surface of the first support plate.

[0011] In the aforementioned cold cathode photon counting X-ray flaw detector, the auxiliary mechanism includes a second support plate and a battery that are fixedly connected to the inner wall of the protective box, and a plurality of rubber limiting rings are fixedly connected to the upper surface of the second support plate.

[0012] In the aforementioned cold cathode photon counting X-ray flaw detector, the measuring end of the third laser ranging sensor and the contact position between the anti-slip hard rubber sleeve on the same side and the outer wall of the polyethylene pipe are on the same vertical plane. The measuring surface of the correction measuring block and the contact position between the anti-slip hard rubber sleeve on the same side and the outer wall of the polyethylene pipe are on the same vertical plane. The outer wall of the rotating ring is fixedly connected to the anti-slip hard rubber sleeve, and the outer wall is provided with anti-slip texture.

[0013] In the aforementioned cold cathode photon counting X-ray flaw detector, rollers are fixedly connected to the four corners of the bottom of the protective box, rectangular wiring through holes are opened on the side wall of the protective box, and U-shaped handles are fixedly connected to the two outer walls of the protective box.

[0014] Compared with existing technologies, the advantages of a cold cathode photon counting X-ray flaw detector are: 1. Using the auxiliary mechanism and pipe outer diameter measuring mechanism, when defect detection is required at the joints of a gas pipeline, first open the box cover and remove the cold cathode X-ray source flaw detector head and photon counting plate assembly from the auxiliary mechanism on the top of the protective box. Then, connect the cable of the cold cathode X-ray source flaw detector head to the connection end of the main body of the cold cathode X-ray flaw detector, and simultaneously connect the photon counting plate assembly to the input end of the main body of the photon counting detector receiving equipment. The pipe outer diameter measuring mechanism is stably installed on the gas pipeline. The cold cathode X-ray source flaw detector head and photon counting plate assembly are symmetrically distributed on both sides of the center of the gas pipeline. The anti-slip hard rubber sleeves, combined with the anti-slip texture on the surface, generate sufficient static friction in the vertical direction of the gas pipeline. Then, multiple anti-slip hard rubber sleeves simultaneously... The gas pipeline surface is in contact with the polyethylene gas pipeline, and the surface of the gas pipeline itself has a certain degree of roughness, which can further improve the vertical static friction between the anti-slip hard rubber sleeve and the pipeline surface, preventing slippage or deflection after the pipeline outer diameter measuring mechanism is positioned. This design allows the cold cathode X-ray source flaw detector head and photon counting plate assembly to be used for defect detection on the outside of the gas pipeline without the need for additional support positioning, saving time and effort. At the same time, it realizes the integrated integration of the cold cathode X-ray source detection equipment and the photon counting detector receiving equipment. Moreover, the installation process of the cold cathode X-ray source flaw detector head and photon counting plate assembly is simple, reducing the procedures for gas pipeline joint defect detection, improving the convenience and efficiency of detection, and reducing the labor intensity of workers.

[0015] 2. Through the established source distance adjustment mechanism, detector distance adjustment mechanism, and pipe outer diameter measurement mechanism, after the pipe outer diameter measurement mechanism is stably installed, the outer diameter of the gas pipeline is quickly measured by the third laser distance sensor and the correction measuring block. The PLC controller then calculates the source distance threshold and detector distance threshold required for defect detection of the gas pipeline at that outer diameter. The PLC controller then automatically controls the source distance adjustment mechanism and detector distance adjustment mechanism. The source distance adjustment mechanism automatically and precisely adjusts the source distance required by the cold cathode X-ray source flaw detector head, and the detector distance adjustment mechanism automatically and precisely adjusts the detector distance required by the photon counting plate assembly. This mechanism enables the flaw detector to have an automatic and precise adjustment function for the source distance of the cold cathode X-ray source flaw detector head and the detector distance of the photon counting plate assembly, ensuring the accuracy of defect identification.

[0016] 3. After the source distance of the cold cathode X-ray source flaw detector head and the detection distance of the photon counting plate assembly are adjusted through the set drive components and pipe outer diameter measuring mechanism, the cold cathode X-ray source flaw detector head, together with the main body of the cold cathode X-ray flaw detector, emits X-rays towards the gas pipeline joint. Subsequently, the photon counting plate assembly, together with the main body of the photon counting detector receiving equipment, performs defect detection. The detection results are fed back in real time through the touch display panel. In addition, every 2 minutes, the PLC controller controls the drive end of the micro drive motor to rotate for 30 seconds. The micro drive motor drives a rotating rod to rotate slowly through a micro gear reducer, ultimately adjusting the source distance adjustment mechanism and the detection distance. The mechanism rotates slowly, adjusting the detection position of the cold cathode X-ray source flaw detector and the photon counting plate assembly to achieve comprehensive flaw detection of gas pipeline joints. Furthermore, after the positions of the cold cathode X-ray source flaw detector and the photon counting plate assembly change, there is no need for manual readjustment of the source distance and detection distance, saving time and effort. This mechanism enables the flaw detector to automatically rotate and adjust the flaw detection position, ensuring the comprehensiveness, reliability, and efficiency of gas pipeline joint defect detection. It enhances the reliability of the flaw detector and can meet the "numerous, small, scattered, and urgent" on-site inspection needs of urban gas pipelines, providing support for the large-scale and routine application of cold cathode X-ray photon counting detection technology. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a cold cathode photon counting X-ray flaw detector provided by the present invention; Figure 2 This is a cross-sectional structural schematic diagram of the protective box portion in a cold cathode photon counting X-ray flaw detector provided by the present invention; Figure 3 This is a partially enlarged structural schematic diagram of a cold cathode photon counting X-ray flaw detector provided by the present invention; Figure 4 This is a top view of the pipe outer diameter measuring mechanism in a cold cathode photon counting X-ray flaw detector provided by the present invention; Figure 5This is a schematic diagram of the anti-slip hard rubber sleeve in a cold cathode photon counting X-ray flaw detector provided by the present invention; Figure 6 This is a partial three-dimensional structural diagram of the drive component in a cold cathode photon counting X-ray flaw detector provided by the present invention.

[0018] In the diagram: 1. Main body of cold cathode X-ray flaw detector; 2. Main body of photon counting detector receiving equipment; 3. Cold cathode X-ray source flaw detector head; 4. Photon counting plate assembly; 5. Source distance adjustment mechanism; 51. L-shaped bar; 52. First laser ranging sensor; 53. First multi-stage electric push rod; 6. Detection distance adjustment mechanism; 61. Connecting plate; 62. Second laser ranging sensor; 63. Second multi-stage electric push rod; 7. Pipe outer diameter measuring mechanism; 71. L-shaped adjusting plate; 72. Limiting sleeve; 73. Positioning bolt; 74. U-shaped block; 75. Rotating rod. 76 Rotating ring, 77 Anti-slip hard rubber sleeve, 78 U-shaped frame, 79 Third laser rangefinder sensor, 710 Correction measuring block, 8 Drive assembly, 81 U-shaped connecting frame, 82 Micro drive motor, 83 Micro gear reducer, 84 PLC controller, 9 Auxiliary mechanism, 91 Second support plate, 92 Battery, 93 Rubber limit ring, 10 First support plate, 11 Protective box, 12 Box cover, 13 Touch display panel, 14 Anti-slip texture, 15 Roller, 16 Rectangular wiring through hole, 17 U-shaped handle. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1-6 As shown, a cold cathode photon counting X-ray flaw detector includes a cold cathode X-ray flaw detector body 1 and a photon counting detector receiving device body 2. The connection end of the cold cathode X-ray flaw detector body 1 is electrically connected to a cold cathode X-ray source flaw detector head 3 through an interface. The input end of the photon counting detector receiving device body 2 is electrically connected to a photon counting plate assembly 4 through an interface. The bottom end of the cold cathode X-ray source flaw detector head 3 is fixedly connected to a source distance adjustment mechanism 5. The source distance adjustment mechanism 5 includes an L-shaped strip 51 fixedly connected to the bottom end of the cold cathode X-ray source flaw detector head 3. The top outer wall of the L-shaped strip 51 has a fixing hole, and the inner wall of the fixing hole is fixedly connected to a first laser ranging sensor 52. The bottom end of the L-shaped strip 51 is fixedly embedded with a first multi-stage electric push rod 53. The ranging end of the first laser ranging sensor 52 and the emitting end of the cold cathode X-ray source flaw detector head 3 are on the same vertical plane to ensure accurate automatic adjustment of the source distance.

[0021] A detection distance adjustment mechanism 6 is fixedly connected to the outer wall of the photon counting plate assembly 4. The detection distance adjustment mechanism 6 includes a connecting plate 61 fixedly connected to the outer wall of the photon counting plate assembly 4. The bottom outer wall of the connecting plate 61 has a mounting hole, and a second laser range sensor 62 is fixedly connected to the wall of the mounting hole. A second multi-stage electric push rod 63 is fixedly embedded at the bottom of the connecting plate 61. The measuring end of the second laser range sensor 62 and the detection end of the photon counting plate assembly 4 are on the same vertical plane to ensure accurate automatic adjustment of the detection distance.

[0022] The connection ends of the source distance adjustment mechanism 5 and the detection distance adjustment mechanism 6 are jointly and fixedly connected to the pipe outer diameter measuring mechanism 7. The pipe outer diameter measuring mechanism 7 includes two L-shaped adjustment plates 71. The outer walls of the two L-shaped adjustment plates 71 are respectively fixedly connected to the moving ends of the first multi-stage electric push rod 53 and the second multi-stage electric push rod 63. The outer walls of the two L-shaped adjustment plates 71 are movably fitted with a limit sleeve 72. The outer wall of the limit sleeve 72 has two threaded holes, and the hole walls of the threaded holes are threaded with positioning bolts 73. U-shaped blocks 74 are fixedly connected to the outer walls of the opposite sides of the two L-shaped adjustment plates 71. The top and bottom ends of the U-shaped blocks 74 are provided with through holes, and the hole walls of the through holes are connected to rotating rods 75 through rolling bearings. The rod walls of the rotating rods 75 are fixedly fitted with two rotating rings 76, and the outer walls of the rotating rings 76 are fixedly connected with anti-slip hard rubber. Set 77, in which a U-shaped frame 78 is fixedly connected to the inner wall of one L-shaped adjusting plate 71, a third laser ranging sensor 79 is fixedly connected to the inner wall of the fixing hole of the U-shaped frame 78, a correction measuring block 710 that cooperates with the third laser ranging sensor 79 is fixedly connected to the inner wall of the other L-shaped adjusting plate 71, a drive assembly 8 is fixedly connected to the upper surface of one U-shaped block 74, the drive assembly 8 includes a U-shaped connecting frame 81 fixedly connected to the upper surface of the U-shaped block 74 and a micro drive motor 82, a micro gear reducer 83 is fixedly embedded at the top of the U-shaped connecting frame 81, the output end of the micro drive motor 82 is fixedly connected to the drive end of the micro gear reducer 83, the driven end of the micro gear reducer 83 is fixedly connected to the top of the rotating rod 75, and a PLC controller 84 is fixedly connected to the upper surface of the first support plate 10.

[0023] The main body 1 of the cold cathode X-ray flaw detector and the main body 2 of the photon counting detector receiving device are fixedly connected to the bottom of a first support plate 10. A protective box 11 is fixedly connected to the outer wall of the first support plate 10. A box cover 12 is hinged to the top of the protective box 11. A touch display panel 13 is fixedly connected to the inner wall of the box cover 12. An auxiliary mechanism 9 is fixedly connected to the inner wall of the protective box 11. The auxiliary mechanism 9 includes a second support plate 91 and a battery 92 fixedly connected to the inner wall of the protective box 11. Multiple rubber limiting rings 93 are fixedly connected to the upper surface of the second support plate 91.

[0024] The measuring end of the third laser ranging sensor 79 and the contact position of the anti-slip hard rubber sleeve 77 on the same side with the outer wall of the polyethylene pipe are on the same vertical plane. The measuring surface of the correction measuring block 710 and the contact position of the anti-slip hard rubber sleeve 77 on the same side with the outer wall of the polyethylene pipe are on the same vertical plane. The outer wall of the rotating ring 76 is fixedly connected to the anti-slip hard rubber sleeve 77, and the outer wall of the anti-slip hard rubber sleeve 77 has anti-slip texture 14. Rollers 15 are fixedly connected to the four corners of the bottom of the protective box 11. The side wall of the protective box 11 has a rectangular wiring through hole 16. U-shaped handles 17 are fixedly connected to both outer walls of the protective box 11.

[0025] Furthermore, the output terminal of the photon counting detector receiving device 2 is electrically connected to the touch display panel 13 via a cable. The touch display panel 13, the first laser ranging sensor 52, the second laser ranging sensor 62, and the third laser ranging sensor 79 are all electrically connected to the input terminal of the PLC controller 84 via wires. The first multi-stage electric push rod 53, the second multi-stage electric push rod 63, and the micro drive motor 82 are all electrically connected to the output terminal of the PLC controller 84 via wires. The battery 92 is used to power the various electrical components of the flaw detector. The above-mentioned electrical components and electrical connections are all existing technologies and will not be described in detail here.

[0026] The operating principle of the present invention is described as follows: When a defect detection is required at the joint of a gas pipeline, the operator first moves the protective box 11 to the gas pipeline to be inspected using the roller 15. After opening the box cover 12, the operator takes out the cold cathode X-ray source flaw detector head 3 and the photon counting plate assembly 4 from the auxiliary mechanism 9 on the top of the protective box 11. Then, the cable of the cold cathode X-ray source flaw detector head 3 is connected to the connection end of the cold cathode X-ray flaw detector body 1, and the photon counting plate assembly 4 is connected to the input end of the photon counting detector receiving device body 2. Next, the pipe outer diameter measuring mechanism 7 is fitted onto the outside of the gas pipeline, with the cold cathode X-ray source flaw detector 3 and the photon counting plate assembly 4 symmetrically distributed on both sides of the center of the gas pipeline. Then, the operator simultaneously pushes the two L-shaped adjusting plates 71 to move towards each other, so that the anti-slip hard rubber sleeve 77 on the outside of the rotating ring 76 is tightly against the outer wall of the gas pipeline. Then, the two positioning bolts 73 are rotated, and the two positioning bolts 73 respectively squeeze and position the two L-shaped adjusting plates 71, thereby achieving the limit of the pipe outer diameter measuring mechanism 7. At this time, the anti-slip hard rubber sleeve 77, in conjunction with the anti-slip texture 14 on its surface, generates sufficient static friction in the vertical direction of the gas pipeline. The magnitude of this vertical static friction can be adjusted by adjusting the squeezing force of the anti-slip hard rubber sleeve 77 on the gas pipeline. The closer the operator pushes the L-shaped adjusting plate 71 to the gas pipeline, the greater the thrust is transmitted to the anti-slip hard rubber sleeve 77 through the L-shaped adjusting plate 71, U-shaped block 74, rotating rod 75 and rotating ring 76, thus increasing the squeezing force on the pipeline. At the same time, the anti-slip hard rubber sleeve 77 and the surface of the gas pipeline... The greater the vertical static friction of the surface, the more anti-slip hard rubber sleeves 77 simultaneously contact the gas pipeline surface, effectively supporting the pipeline outer diameter measuring mechanism 7 to prevent slippage. Furthermore, the polyethylene gas pipeline surface itself has a certain degree of roughness, further increasing the vertical static friction between the anti-slip hard rubber sleeves 77 and the pipeline surface. This prevents the pipeline outer diameter measuring mechanism 7 from slipping or deflecting after positioning, ensuring the stability of the source distance adjustment mechanism 5 and the detector distance adjustment mechanism 6, and improving the reliability of their operation. This design eliminates the need for additional support positioning when the cold cathode X-ray source flaw detector head 3 and the photon counting plate assembly 4 are used for defect detection on the outside of the gas pipeline, saving time and effort. It also achieves integrated operation of the cold cathode X-ray source detection equipment and the photon counting detector receiving equipment. The installation process of the cold cathode X-ray source flaw detector head 3 and the photon counting plate assembly 4 is simple, reducing the steps in gas pipeline joint defect detection, improving the convenience and efficiency of detection, and reducing the labor intensity of workers. After the pipe outer diameter measuring mechanism 7 is assembled and positioned, the third laser ranging sensor 79 emits a brief laser pulse through its measuring end. The pulse is reflected by the correction measuring block 710 and captured. Its internal timer records the time difference between the laser emission and reception. Combined with the known speed of light, the straight-line distance between the measuring end of the third laser ranging sensor 79 and the correction measuring block 710 is calculated. In addition, since the measuring end of the third laser ranging sensor 79, the contact position of the anti-slip hard rubber sleeve 77 on the same side, and the outer wall of the polyethylene pipe are on the same vertical plane, the measurement of the correction measuring block 710... The anti-slip hard rubber sleeve 77 on the same side is in contact with the outer wall of the polyethylene pipe on the same vertical plane. Therefore, the calculated distance is the actual outer diameter of the gas pipeline. Subsequently, the third laser ranging sensor 79 converts the measured distance into an electrical signal and sends it to the PLC controller 84. The PLC controller 84 calculates the source distance threshold and detection distance threshold required for gas pipeline defect detection under this outer diameter according to the preset program (the source distance threshold refers to the distance between the cold cathode X-ray source flaw detector head 3 and the outer wall of the gas pipeline, and the detection distance threshold refers to the distance between the photon counting plate assembly 4 and the outer wall of the gas pipeline). Next, the PLC controller 84 controls the extension of the moving ends of the first multi-stage electric push rod 53 and the second multi-stage electric push rod 63. When the moving end of the first multi-stage electric push rod 53 extends, it drives the L-shaped strip 51 to move. During the movement, the first laser ranging sensor 52 emits a laser beam to measure the source distance between the cold cathode X-ray source flaw detector head 3 and the gas pipeline in real time until the measured value reaches the source distance threshold preset by the PLC controller 84. Then, the PLC controller 84 controls the first multi-stage electric push rod 53 to stop extending. Similarly, the second laser ranging sensor 62 measures the detection distance between the photon counting board assembly 4 and the gas pipeline in real time until the measured value reaches the preset detection distance threshold. The PLC controller 84 controls the second multi-stage electric push rod 63 to stop extending. This mechanism enables the flaw detector to have the function of automatic and precise adjustment of the source distance between the cold cathode X-ray source flaw detector head 3 and the detection distance between the photon counting board assembly 4, ensuring the accuracy of defect identification. At the same time, it further reduces the process of gas pipeline joint defect detection, improves the convenience and efficiency of detection, and reduces the labor intensity of the staff. After the source distance of the cold cathode X-ray source flaw detector 3 and the detection distance of the photon counting plate assembly 4 are adjusted, the cold cathode X-ray source flaw detector 3, together with the main body 1 of the cold cathode X-ray flaw detector, emits X-rays towards the gas pipeline joint. Subsequently, the photon counting plate assembly 4, together with the main body 2 of the photon counting detector receiving device, performs defect detection. The specific process is as follows: after the X-rays penetrate the gas pipeline joint, the photon counting plate assembly 4 captures the X-ray photons after penetration. The photon signal is converted into an electrical signal by the cadmium zinc telluride (CZT) semiconductor detector integrated inside the photon counting plate assembly 4. After the electrical signal is processed by the main body 2 of the photon counting detector receiving device, multi-energy spectrum channel imaging is realized (which can distinguish X-ray signals of different energies), which greatly improves the image contrast and signal-to-noise ratio. At the same time, the deep learning defect recognition module built into the device extracts and analyzes the features of the multi-energy spectrum imaging data, accurately identifies harmful defects such as cold welding, lack of fusion, and porosity. The detection results are fed back in real time through the touch display panel 13. In addition, every 2 minutes, the PLC controller 84 controls the drive end of the micro drive motor 82 to rotate for 30 seconds. The micro drive motor 82 drives a rotating rod 75 to rotate slowly through the micro gear reducer 83. The rotating rod 75 then drives the anti-slip hard rubber sleeve 77 to rotate slowly through the rotating ring 76. The micro gear reducer 83 can reduce the high speed of the drive end of the micro drive motor 82, so that the rotating rod 75 maintains a low speed rotation, ensuring that the pipe outer diameter measuring mechanism 7 is stable when rotating along the surface of the gas pipeline. Because the anti-slip hard rubber sleeve 77 has a large friction with the surface of the gas pipeline after being squeezed, it can drive the pipe outer diameter measuring mechanism 7 to rotate slowly and stably along the outer wall of the gas pipeline. Mechanism 7 synchronously drives the source distance adjustment mechanism 5 and the detector distance adjustment mechanism 6 to slowly rotate, adjusting the detection positions of the cold cathode X-ray source flaw detector head 3 and the photon counting plate assembly 4, realizing comprehensive flaw detection of gas pipeline joints, avoiding omissions in defect detection, and after the positions of the cold cathode X-ray source flaw detector head 3 and the photon counting plate assembly 4 change, there is no need for manual readjustment of the source distance and detector distance, saving time and effort. This mechanism enables the flaw detector to have the function of automatically rotating and adjusting the flaw detection position, ensuring the comprehensiveness and reliability of gas pipeline joint defect detection, and meeting the "numerous, small, scattered, and urgent" on-site inspection needs of urban gas pipelines, providing support for the large-scale and routine application of cold cathode X-ray photon counting detection technology.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cold cathode photon counting X-ray flaw detector, comprising a cold cathode X-ray flaw detector body (1) and a photon counting detector receiving device body (2), characterized in that, The cold cathode X-ray flaw detector body (1) is electrically connected to a cold cathode X-ray source flaw detector head (3) via an interface at its connection end, and the photon counting detector receiving device body (2) is electrically connected to a photon counting board assembly (4) via an interface at its input end. The bottom end of the cold cathode X-ray source flaw detector (3) is fixedly connected to the source distance adjustment mechanism (5). The outer wall of the photon counting plate assembly (4) is fixedly connected to a detection distance adjustment mechanism (6). The connection ends of the source distance adjustment mechanism (5) and the detection distance adjustment mechanism (6) are fixedly connected to the pipe outer diameter measuring mechanism (7). The bottom ends of the main body (1) of the cold cathode X-ray flaw detector and the main body (2) of the photon counting detector receiving device are fixedly connected to a first support plate (10). The outer wall of the first support plate (10) is fixedly connected to a protective box (11). The top of the protective box (11) is hinged to a box cover (12). The inner wall of the box cover (12) is fixedly connected to a touch display panel (13). The inner wall of the protective box (11) is fixedly connected to an auxiliary mechanism (9).

2. The cold cathode photon counting X-ray flaw detector according to claim 1, characterized in that, The source distance adjustment mechanism (5) includes an L-shaped strip (51) fixedly connected to the bottom end of the cold cathode X-ray source flaw detector (3). The top outer wall of the L-shaped strip (51) is provided with a fixing hole, and the inner wall of the fixing hole is fixedly connected with a first laser ranging sensor (52). The bottom end of the L-shaped strip (51) is fixedly embedded with a first multi-stage electric push rod (53).

3. A cold cathode photon counting X-ray flaw detector according to claim 2, characterized in that, The detection range adjustment mechanism (6) includes a connecting plate (61) fixedly connected to the outer wall of the photon counting plate assembly (4). The bottom outer wall of the connecting plate (61) is provided with an installation hole, and a second laser range sensor (62) is fixedly connected to the hole wall. A second multi-stage electric push rod (63) is fixedly embedded at the bottom of the connecting plate (61).

4. A cold cathode photon counting X-ray flaw detector according to claim 3, characterized in that, The pipe outer diameter measuring mechanism (7) includes two L-shaped adjusting plates (71). The outer walls of the two L-shaped adjusting plates (71) are fixedly connected to the moving ends of the first multi-stage electric push rod (53) and the second multi-stage electric push rod (63), respectively. The outer walls of the two L-shaped adjusting plates (71) are movably fitted with a limiting sleeve (72). The outer wall of the limiting sleeve (72) has two threaded holes, and the hole walls of the threaded holes are threaded with positioning bolts (73). The outer walls of the two L-shaped adjusting plates (71) on opposite sides are fixedly connected with U-shaped blocks (74). The top and bottom ends of the U-shaped blocks (74) are provided with through holes, and the hole walls of the through holes are... A rotating rod (75) is connected via a rolling bearing. Two rotating rings (76) are fixedly sleeved on the rod wall of the rotating rod (75). An anti-slip hard rubber sleeve (77) is fixedly connected to the outer wall of the rotating ring (76). A U-shaped frame (78) is fixedly connected to the inner wall of one of the L-shaped adjustment plates (71). A third laser rangefinder (79) is fixedly connected to the inner wall of the fixing hole of the U-shaped frame (78). A correction measuring block (710) that cooperates with the third laser rangefinder (79) is fixedly connected to the inner wall of the other L-shaped adjustment plate (71). A drive assembly (8) is fixedly connected to the upper surface of one of the U-shaped blocks (74).

5. A cold cathode photon counting X-ray flaw detector according to claim 4, characterized in that, The drive assembly (8) includes a U-shaped connecting frame (81) fixedly connected to the upper surface of the U-shaped block (74) and a micro drive motor (82). A micro gear reducer (83) is fixedly embedded at the top of the U-shaped connecting frame (81). The output end of the micro drive motor (82) is fixedly connected to the drive end of the micro gear reducer (83). The driven end of the micro gear reducer (83) is fixedly connected to the top of the rotating rod (75). A PLC controller (84) is fixedly connected to the upper surface of the first support plate (10).

6. A cold cathode photon counting X-ray flaw detector according to claim 1, characterized in that, The auxiliary mechanism (9) includes a second support plate (91) and a battery (92) fixedly connected to the inner wall of the protective box (11). Multiple rubber limiting rings (93) are fixedly connected to the upper surface of the second support plate (91).

7. A cold cathode photon counting X-ray flaw detector according to claim 4, characterized in that, The measuring end of the third laser ranging sensor (79) and the contact position of the anti-slip hard rubber sleeve (77) on the same side with the outer wall of the polyethylene pipe are on the same vertical plane. The measuring surface of the correction measuring block (710) and the contact position of the anti-slip hard rubber sleeve (77) on the same side with the outer wall of the polyethylene pipe are on the same vertical plane. The outer wall of the rotating ring (76) is fixedly connected to the anti-slip hard rubber sleeve (77), and the outer wall is provided with anti-slip texture (14).

8. A cold cathode photon counting X-ray flaw detector according to claim 1, characterized in that, Rollers (15) are fixedly connected to the four corners of the bottom of the protective box (11). A rectangular wiring through hole (16) is opened on the side wall of the protective box (11). A U-shaped handle (17) is fixedly connected to both outer walls of the protective box (11).

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