Infrared radiation protection system for field radiographic inspection and control method thereof

Abstract

The invention relates to an infrared radiation protection system for on-site radiographic inspection and a control method thereof, infrared detection modules are arranged at a plurality of entrance positions of an on-site mobile flaw detection area and used for detecting whether personnel enter the entrance positions in real time to obtain sensing signals, and a running ray device is placed in the on-site mobile flaw detection area; the remote interlocking control module is connected with the infrared detection module through a signal transmission module and used for receiving the sensing signals and determining the personnel entering state, and the signal transmission module is used for transmitting the sensing signals; the ray shutdown module is connected with the remote interlocking control module and is also connected with a ray device; the remote interlocking control module sends a shutdown instruction to the ray shutdown module based on the personnel entering state, and the ray shutdown module controls the ray device to stop emitting rays. The reliability of multi-entrance monitoring is greatly improved, the problems of artificial missed judgment and interference are effectively solved, the mistaken entry response instantaneity is remarkably improved, and the risk of radiation exposure is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of radiation safety protection technology, and in particular to an infrared radiation protection system and its control method for on-site X-ray flaw detection. Background Technology

[0002] On-site radiographic testing (such as X-ray and gamma-ray testing) is the core method for detecting defects in industrial equipment such as pipelines, pressure vessels, and steel structures. In the event of an accident, ionizing radiation can cause irreversible damage to the human body. According to GBZ117-2022 "Radiation Protection Standard for Industrial Flaw Detection," the radiation protection requirements for mobile flaw detection clearly stipulate that "the user unit shall ensure that each flaw detector used for mobile flaw detection work is equipped with at least two full-time personnel, and shall designate the area outside the control zone boundary where the ambient dose equivalent rate is greater than 2.5 μSv / h during operation as a supervised zone, and hang a clearly visible 'No Entry for Unauthorized Personnel' warning sign on its boundary. If necessary, a dedicated person shall be assigned to guard the area. The mobile flaw detector shall have indicator lights and audible prompts to indicate the 'ready' and 'irradiation' statuses. The 'ready' and 'irradiation' signals shall be clearly distinguishable and shall be clearly distinguishable from other alarm signals used in the workplace. Warning lights shall be installed at the boundary of the control zone during nighttime operations. The warning signal indicators for X-ray and gamma-ray flaw detection shall be interlocked with the flaw detector. Manual monitoring shall be used to prevent unauthorized personnel from accidentally entering the radiation control zone, and traceable records shall be kept during the monitoring process."

[0003] However, there are several problems with the relevant technology, such as: 1. Difficulty in monitoring multiple entrances: On-site flaw detection operations often involve multiple entrances (such as fixed equipment maintenance doors, temporary protective fence openings, equipment top maintenance ports, and open areas that cannot be fully monitored at night). It is difficult for the assigned personnel to monitor all entrances and exits at the same time, especially when the operation time is long. On-site flaw detection often starts at night, and personnel are prone to fatigue and distraction, resulting in missed detections of accidental entry. 2. Delayed response to protection: Even if personnel are found to have entered the area, traditional measures require manual operation of the radiation device's shutdown button. The average response time from "detection-response-operation" is as long as 3-5 seconds, during which time personnel have already been exposed to the radiation environment, which does not meet the requirements of GBZ117-2022. 3. Incomplete duty records: Manual duty relies on paper records, which are prone to omissions and errors, and cannot meet the requirements for traceability of the duty process. Moreover, duty records at temporary entrances are even more difficult to retain in a standardized manner. 4. Weak anti-interference capability: Some existing infrared protection devices adopt a single sensor design, which is easily affected by strong light (such as midday sun, searchlight), dust, birds, etc., leading to false triggering and shutdown (affecting work efficiency) or missed triggering (causing safety risks), resulting in insufficient protection reliability.

[0004] In summary, existing protective measures cannot effectively solve the monitoring challenges in multi-entry scenarios, are difficult to fully comply with the requirements of the GBZ117-2022 standard, and cannot quickly implement protective measures.

[0005] The above problems urgently need to be addressed. Summary of the Invention

[0006] This invention discloses an infrared radiation protection system and its control method for on-site X-ray flaw detection, aiming to solve the technical problems existing in the prior art.

[0007] The present invention adopts the following technical solution: On one hand, the present invention provides an infrared radiation protection system for on-site radiographic testing, comprising: an infrared detection module disposed at multiple entrances to a mobile radiographic testing area, for real-time detection of whether personnel have entered the entrances of the mobile radiographic testing area and obtaining sensor signals, wherein an operating X-ray device is placed in the mobile radiographic testing area; a remote interlocking control module connected to the infrared detection module via a signal transmission module, for receiving the sensor signals and determining the personnel entry status, the signal transmission module for transmitting the sensor signals; and a X-ray shutdown module connected to the remote interlocking control module via the signal transmission module, the X-ray shutdown module also being connected to the X-ray device; the remote interlocking control module, based on the personnel entry status, issues a shutdown command to the X-ray shutdown module via the signal transmission module, and the X-ray shutdown module, based on the shutdown command, controls the X-ray device to stop emitting X-rays.

[0008] Optionally, the remote interlocking control module includes: a signal processing unit, comprising an RC low-pass filter circuit and an operational amplifier circuit. The RC low-pass filter circuit receives the sensor signal through the signal transmission module and filters the high-frequency signal to obtain a low-frequency signal. The RC low-pass filter circuit is connected to the operational amplifier circuit, which converts the low-frequency signal into a 0-5V standard signal. A PLC controller is connected to the signal processing unit, receives the standard signal, and determines the personnel entry status based on the standard signal. When the standard signal is at a high potential, it indicates that personnel have entered, and a stop command is issued through the signal transmission module. When the standard signal is at a low potential, it indicates that no personnel have entered.

[0009] Optionally, the remote interlocking control module further includes: a delay judgment unit connected to the PLC controller, which, based on the standard signal, determines the duration of the standard signal being at a high potential, and if the duration of the standard signal being at a high level is less than a preset time, corrects the personnel entry status output by the PLC controller to no personnel entry, wherein the preset time is 50-100ms.

[0010] Optionally, the X-ray shutdown module includes a high-voltage power-off unit, comprising an AC contactor connected to the PLC controller, receiving a shutdown command from the PLC controller. Upon receiving the shutdown command, the contact coil within the AC contactor is energized. The AC contactor is also connected to the high-voltage power supply circuit of the X-ray device. When the contact coil is energized, the contacts within the AC contactor connected to the high-voltage power supply circuit are disconnected, controlling the high-voltage power supply circuit to disconnect.

[0011] Optionally, the radiation shutdown module includes: an equipment locking unit, including a magnetic lock, which is connected to the high-voltage power circuit and the start button of the radiation device. When the high-voltage power circuit is disconnected, the magnetic lock triggers a strong magnetic force to lock the start button of the radiation device.

[0012] Optionally, the infrared detection module includes: multiple through-beam infrared sensors, evenly installed on both sides of each entrance position of the on-site mobile flaw detection area, with the detection direction parallel to the entrance and a detection distance greater than 1 meter; and diffuse reflection infrared sensors, installed at the upper end of each entrance position of the on-site mobile flaw detection area, with the detection direction facing the ground and a detection distance greater than 2 meters.

[0013] Optionally, the infrared radiation protection system further includes: a duty auxiliary module connected to the remote interlocking control module, wherein the remote interlocking control module issues an alarm command to the duty auxiliary module at the same time as issuing a stop command, and the duty auxiliary module issues alarm information based on the alarm command.

[0014] Optionally, the duty assistance module includes: an audible and visual alarm unit connected to the remote interlocking control module, which issues an audible and visual alarm upon receiving an alarm command; a remote prompting unit connected to the remote interlocking control module, which sends a prompting signal to the terminal in the remote control room upon receiving an alarm command; and a duty recording unit connected to the remote interlocking control module, which acquires the time of the alarm command and the time when the X-ray shutdown module stops upon receiving an alarm command.

[0015] According to another aspect of the present invention, a control method for an infrared radiation protection system for on-site radiographic testing is also provided, comprising: S1, pre-operation preparation: a remote interlocking control module performs a system self-test on the infrared detection module, the X-ray shutdown module, and the duty auxiliary module; if the self-test is qualified, the X-ray device in the on-site mobile testing area is started, wherein the qualified self-test is used to indicate that the infrared detection module has no continuous obstruction forming a sensing signal, the X-ray shutdown module has no action to control the X-ray device to stop, and the duty auxiliary module has no fault alarm action; S2, Real-time monitoring: The infrared detection module monitors in real time whether personnel have entered the entrance of the mobile flaw detection area, obtains a sensor signal, and sends the sensor signal to the remote interlocking control module; the remote interlocking control module determines the personnel entry status based on the sensor signal; S3, Interlock Shutdown: When the personnel entry status is "personnel have entered", the X-ray shutdown module controls the X-ray device to stop emitting X-rays and locks the start button of the X-ray device; when the personnel entry status is "personnel have entered", the duty auxiliary module issues an alarm message and records the time information of the X-ray device stopping; S4, Reset and Restart: If the personnel have been in the state for more than 10 minutes and the authorized password entered by the staff has been obtained, the remote interlocking control module will re-perform a system self-test of the infrared detection module, the X-ray shutdown module and the duty auxiliary module.

[0016] The technical solution adopted in this invention can achieve at least one of the following beneficial effects: 1. The reliability of multi-entry monitoring is greatly improved, effectively solving the problems of missed judgment and interference caused by manual intervention: By integrating "through-beam and diffuse reflection dual sensors", combined with RC low-pass filtering and time delay judgment (50-100ms to exclude flying birds or falling leaves), the false trigger rate is ≤0.1 times per 100 hours and the missed trigger rate is 0, effectively replacing the core responsibilities of manual duty and meeting the requirements of GBZ117-2022 "multi-entry duty".

[0017] 2. Significantly improved immediacy of response to accidental entry, greatly reducing the risk of radiation exposure: Through "industrial-grade PLC + CAT5e / 4G DTU dual-mode transmission" (signal delay ≤100ms), the high-voltage power supply of the radiation device is automatically cut off within ≤200ms. The total time from "personnel accidental entry to shutdown" is reduced by more than 93% compared with existing technologies, effectively avoiding personnel exposure to radiation environments.

[0018] 3. Efficient alarm and information transmission, balancing on-site warning and remote control: On-site audible and visual alarms (≥85dB + red flashing 1-2Hz at 1m) ensure the rapid evacuation of unauthorized personnel, while the remote control room (≥50m) displays the trigger entry information simultaneously through LED lights, buzzers, and touch screens, effectively solving the problem of "weak alarm and remote unawareness".

[0019] 4. Compliant and traceable duty records: Automatically records entry detection logs, shutdown events (timestamps and entry numbers), and unlocking operations, and supports CSV export. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below, forming part of the present invention. The illustrative embodiments of the present invention and their descriptions explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 This is a connection structure diagram of an infrared radiation protection system for on-site X-ray flaw detection according to Embodiment 1 of the present invention; Figure 2 This is a flowchart of a control method for an infrared radiation protection system for on-site X-ray flaw detection according to Embodiment 2 of the present invention; Figure 3 This is a structural diagram of an optional infrared radiation protection system for on-site X-ray flaw detection in Embodiment 3 of the present invention.

[0021] Explanation of reference numerals in the attached figures: 1. Remote interlocking control module; 1-1. PLC controller; 1-2. Signal processing unit; 1-3. Delay judgment unit; 2. Infrared detection module; 2-1. Infrared detector (through-beam infrared sensor; diffuse reflection infrared sensor); 3. X-ray shutdown module; 3-1. Equipment locking unit; 3-2. High-voltage power-off unit; 4. Duty Assistant Module; 4-1. Audible and Visual Alarm Unit; 4-2. Remote Prompt Unit; 4-3. Duty Recording Unit.

[0022] 5. Signal transmission module; 6. Backup power module; 7. Radiation device. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. In the description of this invention, it should be noted that the term "or" is generally used to include the meaning of "and / or," unless otherwise expressly indicated.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a magnetic connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0025] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] To address the problems existing in related technologies, this application provides an infrared radiation protection system and its control method for on-site X-ray flaw detection.

[0027] Example 1 This embodiment provides an infrared radiation protection system for on-site X-ray flaw detection, such as... Figure 1 As shown, Figure 1 This is a connection structure diagram of an infrared radiation protection system for on-site X-ray flaw detection according to Embodiment 1 of the present invention. The system includes: Infrared detection module 2 is installed at multiple entrances to the mobile flaw detection area to detect whether personnel have entered the area in real time and obtain sensor signals. An operating X-ray device 7 is placed within the mobile flaw detection area. Remote interlocking control module 1 is connected to infrared detection module 2 via signal transmission module 5 to receive sensor signals and determine personnel entry status. Signal transmission module 5 transmits the sensor signals. X-ray shutdown module 3 is connected to remote interlocking control module 1 via signal transmission module 5 and is also connected to X-ray device 7. Based on personnel entry status, remote interlocking control module 1 sends a shutdown command to X-ray shutdown module 3 via signal transmission module 5. X-ray shutdown module 3 then controls X-ray device 7 to stop emitting X-rays based on the shutdown command.

[0028] Optionally, an infrared detection module 2 (integrated by through-beam and diffuse reflection infrared sensors) is arranged at each entrance of the on-site mobile flaw detection area. The infrared detector 2-1 communicates with the remote interlocking control module 1 through the signal transmission module 5. The remote interlocking control module 1 and the X-ray shutdown module 3 form a closed-loop interlocking circuit. When unauthorized personnel are detected entering the premises, the remote interlock control module 1 automatically sends a shutdown command within ≤200ms, cutting off the high-voltage power supply to the X-ray device 7 and locking the equipment. The system, through a comprehensive protection process of "real-time monitoring - automatic interlocking - traceable recording," fully meets the requirements of GBZ117-2022 "Radiation Protection Standard for Industrial Flaw Detection," which states that "for mobile flaw detection, the user unit should ensure that each flaw detector used for mobile flaw detection is equipped with at least two dedicated personnel, and the area outside the control zone boundary where the ambient dose equivalent rate is greater than 2.5μSv / h during operation should be designated as a supervised zone, with a clearly visible 'No Unauthorized Personnel Allowed' warning sign displayed on its boundary, and dedicated personnel should be assigned to guard it when necessary." This effectively avoids the risk of radiation damage caused by fatigue and missed detections due to manual monitoring, improving the safety and compliance of on-site X-ray flaw detection operations.

[0029] Optionally, the signal transmission module 5 includes a wired transmission unit and a wireless transmission unit. The wired transmission unit uses CAT5e or higher specification Ethernet cable with a transmission rate ≥100Mbps, a transmission distance ≤100m, and an outer PVC wear-resistant protective tube with a wall thickness ≥1.2mm, for connection to the infrared detection module 2 at the fixed entrance (main gate). The wireless transmission module uses an industrial-grade 4G / 5G DTU module, supports TCP / IP protocol, has a signal transmission delay ≤100ms, and an IP65 protection rating, for connection to the infrared detection module 2 at the temporary entrance (opening of the mobile protective fence). Both signal transmission modules 5 have a built-in CRC-16 redundancy check algorithm, and the signal transmission bit error rate is ≤10%. -6 .

[0030] In some preferred embodiments, the remote interlocking control module 1 includes: a signal processing unit 1-2, including an RC low-pass filter circuit and an operational amplifier circuit. The RC low-pass filter circuit receives sensor signals through the signal transmission module 5 and filters high-frequency signals to obtain low-frequency signals. The RC low-pass filter circuit is connected to the operational amplifier circuit, which is used to convert the low-frequency signals into a standard signal of 0-5V. A PLC controller 1-1 is connected to the signal processing unit 1-2, receives the standard signal, and determines the personnel entry status based on the standard signal. When the standard signal is at a high potential, it indicates that personnel have entered, and a stop command is issued through the signal transmission module 5. When the standard signal is at a low potential, it indicates that no personnel have entered.

[0031] Optionally, the remote interlocking control module 1 includes a PLC controller 1-1, a signal processing unit 1-2, and a delay judgment unit 1-3; the PLC controller 1-1 adopts an industrial-grade programmable logic controller, with built-in protection logic program adapted to the GBZ117-2022 standard, supporting online parameter modification and program upgrade; the signal processing unit 1-2 includes an RC low-pass filter circuit and an operational amplifier circuit, which converts the weak 0.1-1V signal output by the infrared detection module 2 into a standard 0-5V signal that can be recognized by the PLC controller 1-1.

[0032] In some preferred embodiments, the remote interlocking control module 1 further includes: a delay judgment unit 1-3, connected to the PLC controller 1-1, which judges the time when the standard signal is at a high level based on the standard signal, and corrects the personnel entry status output by the PLC controller 1-1 to no personnel entry when the time when the standard signal is at a high level is less than a preset time, wherein the preset time is 50-100ms.

[0033] Optionally, the delay judgment unit 1-3 is a timer unit built into the remote interlocking control module 1, which can be set to a delay time of 50-100ms. It is determined to be a valid personnel intrusion signal only when the sensor signal output by the infrared detection module 2 continuously meets the delay requirement, effectively eliminating short-term interference such as birds and falling leaves.

[0034] In some preferred embodiments, the X-ray shutdown module 3 includes a high-voltage power-off unit 3-2, which includes an AC contactor connected to a PLC controller 1-1 and receives a shutdown command from the PLC controller 1-1. Upon receiving the shutdown command, the contact coil inside the AC contactor is energized. The AC contactor is also connected to the high-voltage power supply circuit of the X-ray device 7. When the contact coil is energized, the contacts inside the AC contactor connected to the high-voltage power supply circuit are disconnected, thus controlling the high-voltage power supply circuit to disconnect.

[0035] Optionally, the high-voltage power-off unit 3-2 adopts an AC contactor, which is connected in series with the high-voltage power supply circuit of the X-ray device 7. The coil inside the AC contactor is controlled by the digital output terminal of the remote interlocking control module 1. When the coil is energized, the contacts of the AC contactor open, cutting off the high-voltage power supply circuit.

[0036] In some preferred embodiments, the X-ray shutdown module 3 includes: an equipment locking unit 3-1, including a magnetic lock, which is connected to the high-voltage power circuit and the start button of the X-ray device 7. When the high-voltage power circuit is disconnected, the magnetic lock triggers a strong magnetic force to lock the start button of the X-ray device 7.

[0037] Optionally, the equipment locking unit 3-1 includes an electromagnetic lock with a locking force of ≥500N and a logic control circuit. The electromagnetic lock is installed outside the start button of the X-ray device 7 or connected to the start button. The logic control circuit is connected to the remote interlocking control module 1. After the machine stops, the electromagnetic lock automatically locks and requires a 6-8 digit authorization password to unlock.

[0038] In some preferred embodiments, the infrared detection module 2 includes: multiple through-beam infrared sensors, evenly installed on both sides of each entrance position of the mobile flaw detection area, with the detection direction parallel to the entrance and the detection distance greater than 1 meter; and diffuse reflection infrared sensors, installed at the upper end of each entrance position of the mobile flaw detection area, with the detection direction facing the ground and the detection distance greater than 2 meters.

[0039] Optionally, each entrance is equipped with both through-beam infrared sensors and diffuse infrared sensors. The transmitters and receivers of the through-beam infrared sensors are installed on the pillars or protective fences on both sides of the entrance to the mobile flaw detection area. The lateral spacing of the through-beam infrared sensors is adapted to the width of the entrance (adaptation range 0.8-3m), and the detection height is set to 1.2-1.5m, forming a lateral detection light curtain covering the entire width of the entrance. The diffuse infrared sensors are installed on the inner side above the entrance (installation height 2.2-2.5m), with a detection angle ≥90 degrees and a detection distance ≥2m, covering an area of ​​1-1.5m inside the entrance.

[0040] In some preferred embodiments, the infrared radiation protection system further includes: a duty auxiliary module 4, which is connected to the remote interlocking control module 1. The remote interlocking control module 1 issues an alarm command to the duty auxiliary module 4 at the same time as issuing a stop command, and the duty auxiliary module 4 issues an alarm message based on the alarm command.

[0041] In some preferred embodiments, the duty assistance module 4 includes: an audible and visual alarm unit 4-1, connected to the remote interlocking control module 1, which issues an audible and visual alarm when an alarm command is received; a remote prompting unit 4-2, connected to the remote interlocking control module 1, which sends a prompting sign to the terminal in the remote control room when an alarm command is received; and a duty recording unit 4-3, connected to the remote interlocking control module 1, which acquires the time of the alarm command and the time when the X-ray shutdown module 3 stops when an alarm command is received.

[0042] Optionally, the duty auxiliary module 4 includes an audible and visual alarm unit 4-1, a remote prompting unit 4-2, and a duty recording unit 4-3. The audible and visual alarm unit 4-1 adopts an integrated audible and visual alarm, installed 1.5-2m away from the entrance. The alarm sound pressure level measured at 1m needs to be ≥85dB, and the alarm light is red flashing (flashing frequency 1 to 2Hz), which is triggered by the infrared detection module 2. The remote prompting unit 4-2 is set in a remote control room ≥50m away from the work site, including a red LED alarm light, a buzzer with a sound pressure level ≥70dB, and a 10-12 inch touch screen (resolution ≥1024×600). The touch screen displays the entrance number, sensor status, and downtime in real time. The duty recording unit 4-3 adopts an SD card or cloud storage module with a capacity ≥8GB. The recorded content includes the entrance detection log (sampling interval 1s), downtime events (trigger time, entrance number, signal strength), and unlocking operations (unlocking personnel, unlocking time). The storage time is ≥90 days, and it supports exporting CSV format files via USB.

[0043] Optionally, the protection system also includes a backup power module 6. The backup power module 6 uses a UPS uninterruptible power supply with a capacity of ≥1kVA, with an input of AC220V and an output of AC220V (powering PLC controller 1-1 and touch screen) and DC24V (powering infrared detection module 2 and DTU module). When the main power supply is interrupted on site, the backup power module 6 automatically switches power supply (switching time ≤10ms). Different UPS power supplies are selected according to the on-site flaw detection task. When the backup power supply is below 20%, the remote prompting module triggers a low power alarm.

[0044] Example 2 Based on the above embodiments, the present invention also proposes a control method for an infrared radiation protection system for on-site X-ray flaw detection. Figure 2 This is a flowchart of a control method for an infrared radiation protection system for on-site X-ray flaw detection according to Embodiment 2 of the present invention, as shown below. Figure 2 As shown, the method includes: Step S1, Pre-operation preparation: The remote interlocking control module 1 performs a system self-test on the infrared detection module 2, the X-ray shutdown module 3, and the duty auxiliary module 4; if the self-test is qualified, the X-ray device 7 in the mobile flaw detection area is started. The self-test qualification is used to indicate that the infrared detection module 2 has no continuous obstruction forming a sensing signal, the X-ray shutdown module 3 has no action to control the X-ray device 7 to stop, and the duty auxiliary module 4 has no fault alarm action. Optionally, staff can click "System Self-Test" on the touchscreen in the remote control room. The remote interlocking control module 1 will then initiate the self-test process: ① Infrared detection module 2: Sends test signals to each sensor to detect signal strength; ② Signal transmission module 5: Detects the continuity of the wired module and the signal strength of the wireless module; ③ X-ray shutdown module 3: Controls the AC contactor to open or close, and the electromagnetic lock to lock or unlock; ④ Duty auxiliary module 4: Triggers audible and visual alarm tests, and records the data for storage. If the self-test passes, the touchscreen displays "System Ready," allowing the X-ray device 7 to start. If the self-test fails, a fault message is displayed (e.g., "Weak wireless signal at entrance 2"). The self-test can only be repeated after troubleshooting.

[0045] Step S2, Real-time monitoring: The infrared detection module 2 monitors in real time whether personnel have entered the entrance of the mobile flaw detection area, obtains the sensor signal, and sends the sensor signal to the remote interlocking control module 1; the remote interlocking control module 1 determines the personnel entry status based on the sensor signal; Optionally, after the X-ray device 7 is started, the infrared detectors 2-1 at each entrance enter a continuous monitoring state. The through-beam sensors monitor in real time whether the detection light curtain is blocked (outputting a low level when blocked), and the diffuse reflection sensors monitor whether there is an object inside the entrance (outputting a high level when an object is detected). The sensor signals are transmitted to the remote interlocking control module 1 via the signal transmission module 5. After being filtered and amplified by the signal processing unit 1-2, the signals are transmitted to the delay judgment unit 1-3. The delay judgment unit 1-3 determines the validity of the signal based on a preset time (50-100ms). If the signal duration does not reach the threshold, it is determined to be interference and no subsequent action is triggered.

[0046] Specifically, the criteria for determining a valid unauthorized entry signal are as follows: the through-beam infrared sensor continuously blocks the light curtain for ≥50ms and the diffuse reflection sensor simultaneously detects the object signal; or the diffuse reflection sensor detects the object signal for ≥100ms and the through-beam sensor displays an abnormal signal (such as a malfunction). Both situations are considered valid signals.

[0047] Step S3, Interlock Shutdown: When the personnel entry status is "personnel have entered", the X-ray shutdown module 3 controls the X-ray device 7 to stop emitting X-rays and locks the start button of the X-ray device 7; when the personnel entry status is "personnel have entered", the duty auxiliary module 4 issues an alarm message and records the time information of the X-ray device 7 stopping. First, when the delay judgment unit 1-3 confirms a valid personnel trespass signal (judgment criteria: through-beam light curtain obstruction ≥50ms + diffuse reflection object detection, or diffuse reflection object detection ≥100ms + through-beam fault), the remote interlock control module 1 immediately outputs a high-level signal to the X-ray device 7 shutdown unit. At this time, ① the high-voltage power cut-off unit 3-2: the coil of the AC contactor is energized, the contacts are open, the high-voltage power supply of the X-ray device 7 is cut off, and the X-ray device 7 stops radiating; ② the equipment locking unit 3-1: the electromagnetic lock coil is energized, locking the start button; at the same time, the on-site sound and light alarm unit 4-1 triggers the alarm, the LED light of the remote prompt unit 4-2 lights up, the buzzer sounds, and the touch screen pops up a "Entrance X personnel trespassed, shutdown" pop-up window; the remote interlock control module 1 synchronously writes the event information (timestamp, entrance number, sensor signal value, shutdown status) into the duty record unit 4-3; Optionally, if multiple entrances simultaneously detect unauthorized entry signals, the remote interlocking control module 1 sorts the entrances according to their distance from the X-ray device 7 (nearest distance priority), prioritizing high-risk entrance signals; all on-site audible and visual alarm modules that trigger entrances are activated synchronously, and the remote prompting module displays the information of each entrance in parallel.

[0048] Optionally, for scenarios where multiple entrances are triggered simultaneously, the remote interlocking control module 1 has a "priority judgment" function, which sorts the entrances according to their distance from the radiation device 7 (distance <5m is high priority, 5-10m is medium priority, and >10m is low priority), prioritizing the processing of high-priority entrance signals to ensure a faster protection response in the radiation core area; at the same time, the audible and visual alarm units 4-1 of all triggered entrances are activated synchronously, and the remote prompting unit 4-2 displays the entrance information in parallel on the touch screen according to priority, which is convenient for staff to coordinate and handle.

[0049] Optionally, the duty record unit 4-3 adopts a "circular storage + tamper-proof" mechanism: when the storage capacity reaches the upper limit, it automatically overwrites the oldest record (retaining data for the last 90 days); the record file contains fields such as "timestamp, entry number, through-beam sensor status, diffuse reflection sensor status, shutdown status, unlocking personnel ID, and unlocking time", and is stored in CSV format, which can be read by detection equipment required by the GBZ117-2022 standard, making it convenient for regulatory authorities to verify the duty status.

[0050] Step S4, Reset and Restart: If the personnel have been in the state for more than 10 minutes and the authorization password entered by the staff has been obtained, the remote interlock control module 1 will re-perform the system self-test of the infrared detection module 2, the X-ray shutdown module 3 and the duty auxiliary module 4.

[0051] Optionally, staff members arrive at the trigger entrance with an authorized terminal. After confirming that there are no personnel or obstructions (such as debris blocking the sensors) in the entrance area, they return to the remote control room. They then enter a 6-8 digit authorization password on the touchscreen. After the remote interlocking control module 1 verifies the password, it outputs a low-level signal to unlock the equipment locking unit 3-1. Clicking "Retest" will cause the system to retest each module. If the self-test is successful, the touchscreen will display "System Ready," and staff members can then start the X-ray device 7 to continue working. If the self-test still fails, the fault needs to be checked again (such as sensor misalignment or damaged transmission lines).

[0052] Example 3 Based on the above embodiments, the present invention also proposes an embodiment of an optional infrared radiation protection system for on-site X-ray flaw detection. Figure 3 This is a structural diagram of an optional infrared radiation protection system for on-site X-ray flaw detection according to Embodiment 3 of the present invention, as shown below. Figure 3 As shown, the system includes: like Figure 3 As shown, this scenario describes an X-ray flaw detection operation applied to a pipeline in a chemical industrial park. The operation involves inspecting weld defects in a DN1200 pipeline. The work area has three entrances: Entrance 1 is a fixed equipment maintenance door (1.8m wide); Entrances 2 and 3 are openings in temporary mobile protective fences (1.5m wide). The operation must meet the guard requirements for each entrance as specified in GBZ117-2022. The specific implementation is as follows: First, infrared detection unit 2 (i.e., infrared detection module) needs to be set up: one infrared detector 2-1 is arranged at each entrance, using both through-beam infrared sensors and diffuse infrared sensors; at entrance 1 (fixed maintenance door), the transmitter and receiver of the through-beam infrared sensor are installed on the pillars on both sides of the door, with a horizontal spacing of 1.8m and a detection height of 1.3m; the diffuse infrared sensor is installed on the crossbeam 2.3m above the inside of the door, with the detection direction facing the area 1.5m inside the door; at entrance 2 and entrance 3 (temporary fence opening), the through-beam infrared sensors are installed on the metal brackets on both sides of the fence, with a horizontal spacing of 1.5m and a detection height of 1.2m; the diffuse infrared sensors are installed on the bracket 2.2m above the inside of the fence, with the detection direction facing the area 1.2m inside the fence.

[0053] All sensors (through-beam infrared sensors and diffuse-reflection infrared sensors) are connected to signal transmission module 5 via RVVP2×0.75 shielded cables. One end of the shielding layer is grounded (grounding resistance 3Ω), and the other end is left floating to avoid grounding loop interference.

[0054] Regarding the configuration of signal transmission module 5: Entrance 1 (fixed entrance) uses a CAT5e Ethernet cable as wired transmission unit 5-1, with a cable length of 25m and an outer PVC protective pipe with a wall thickness of 1.2mm. It is laid openly along the wall, and both ends are connected to the Ethernet interfaces of infrared detector 2-1 and remote interlocking control module 1, respectively. Entrances 2 and 3 (temporary entrances) use industrial-grade 4G DTU modules as wireless transmission units 5-2. The DTU modules are powered by DC24V and are installed on the fence posts with metal brackets (protection level IP65). The park IoT SIM card is inserted, and it communicates with the wireless receiver of remote interlocking control module 1 through the 4G network. The actual measured signal transmission delay is 85ms.

[0055] Regarding the configuration of the remote interlocking control module 1: PLC controller 1-1: A controller with 14 digital inputs and 10 digital outputs is selected, with built-in Ethernet and RS485 interfaces, and installed in the control cabinet of the remote operation room; Signal processing unit 1-2: An LM324 operational amplifier is used to build an RC low-pass filter circuit and an operational amplifier circuit to amplify the 0.2-0.8V signal output from the infrared detection module to 3-12V, and then convert it into a 0-5V standard signal input to PLC controller 1-1 through a voltage divider circuit. Delay judgment unit 1-3: A TON timer is set in the program of PLC controller 1-1, with a delay time set to 80ms. Only when the sensing signal lasts for 80ms is it determined to be a valid false signal.

[0056] Regarding the setup of X-ray shutdown module 3: High-voltage power-off unit 3-2 uses a Schneider LC1D12M7C AC contactor (rated current 12A, coil voltage 24V), connected in series with the high-voltage power supply circuit (AC220V) of the X-ray flaw detector (model: XX2005). The coil of the AC contactor is controlled by the digital output terminal Q0.0 of the PLC controller. Equipment locking unit 3-1 uses a YHM-12 electromagnetic lock (locking force 600N, coil voltage 24V), installed outside the start button of the X-ray flaw detector. The electromagnetic lock control circuit is controlled by the digital output terminal Q0.1 of the PLC controller; the unlock password is set to 8 digits (1234ABCD), verified by inputting through the touchscreen.

[0057] Regarding the setup of the auxiliary module 4: Audible and visual alarm unit 4-1: Install one Tianyi AD16-22SM integrated audible and visual alarm (DC24V power supply) next to each entrance, at a height of 1.8m. The measured sound pressure level at 1m is 92dB, and the red LED flashing frequency is 1.5Hz. Connect it to the alarm output terminal of the infrared detector 2-1 via cable for synchronous triggering. Remote prompting unit 4-2: Install the following in the remote control room (60m from the work site): ① Red LED alarm light (model: AD105), installed on the top of the control cabinet; ② Buzzer (model: SFM-27), sound pressure level 75dB, installed inside the control cabinet; ③ 10-inch Weintek... The TK6071IP touchscreen connects to the PLC via Ethernet, displaying real-time information such as the status of each entry point (green: normal, red: triggered), sensor signal values, and shutdown events. The monitoring and recording unit 4-3 uses a 16GB SanDisk SD card, inserted into the PLC's extended storage interface, with a recording interval of 1 second. Stored content includes: timestamp (accurate to the second), entry point number, status of through-beam infrared sensors (1: normal, 0: blocked), status of diffuse infrared sensors (1: object detected, 0: no object), shutdown status (1: shutdown, 0: running), unlocking personnel ID, and unlocking time. It also supports exporting CSV files via the touchscreen.

[0058] Regarding the configuration of backup power module 6: A SANTAK C1K UPS uninterruptible power supply (capacity 1kVA, battery capacity 7Ah) is selected, with input AC220V and output AC220V (powering PLC controller 1-1 and touch screen) and DC24V (powering infrared detector 2-1 and DTU module via DC-DC converter); the UPS is installed next to the control cabinet in the remote control room and connected to the main power switch. It automatically switches power supply when the main power is interrupted. The actual measured power supply time under full charge is 42 minutes; when the UPS power is below 20%, a low power signal is sent to the PLC through the RS485 interface, triggering the "low power alarm" of the remote prompt unit 4-2.

[0059] Example 4 Based on the above embodiments, the present invention also proposes an embodiment of an optional infrared radiation protection system for on-site X-ray flaw detection, the method comprising: Step S101, Preparation stage before operation: Staff clicked "System Self-Test" on the touchscreen in the remote control room, and the PLC controller started the self-test process (lasting about 2 minutes). Specifically: the PLC controller sent test signals to each infrared detector 2-1. The feedback signal strengths of infrared detectors 2-1 at entrances 1 to 3 were 0.9V, 0.85V, and 0.8V respectively, all ≥0.8V, thus passing the test; the wired transmission unit 5-1 of the signal transmission module 5 passed the continuity test (resistance 5Ω), and the signal strength of the wireless transmission unit 5-2 was -75dBm, ≥-80dBm, thus passing the test; in the X-ray shutdown module 3, the PLC control Q0.0 output a high level, the AC contactor disconnected, the high-voltage power supply was cut off, and the control Q0.1 output a high level, locking the electromagnetic lock, thus passing the test; in the duty auxiliary module 4, the audible and visual alarm unit 4-1 was triggered, the alarm was normal, the SD card storage test was normal, thus passing the test; the UPS power display of the backup power module 6 was 95%, thus passing the test.

[0060] After passing the self-inspection, the touch screen displays "System ready, X-ray device can be started". The staff presses the start button of the X-ray flaw detector, and the X-ray device enters the working state (tube voltage 200kV, tube current 5mA).

[0061] Step S102, Real-time monitoring stage: During the operation of the X-ray device, each entrance infrared detector 2-1 continuously monitors the light curtain. Specifically, the through-beam sensor at entrance 1 monitors the light curtain in real time (outputting 1 when there is no obstruction and 0 when there is obstruction), and the diffuse reflection sensor monitors the area inside the door (outputting 0 when there is no object and 1 when there is an object). The signals are transmitted to the PLC controller through the wired transmission unit 5-1. After filtering and amplification by the signal processing unit 1-2, the signals are input to the PLC digital input terminal. The sensor signals at entrances 2 and 3 are transmitted to the PLC controller through the wireless transmission unit 5-2. The PLC controller displays the status of each infrared detector in real time (green display on the touch screen).

[0062] Optionally, if a bird briefly blocks the through-beam sensor at entrance 2 (blocking time 25ms), the signal disappears after the timer of delay judgment unit 1-3 counts for 25ms, which is determined to be interference and no subsequent action is triggered.

[0063] Step S103, Interlocking Shutdown Phase: An unauthorized person mistakenly enters area 2 of entrance, obstructing the light curtain of the through-beam sensor (duration 120ms). Simultaneously, the diffuse reflection sensor detects the person's signal (duration 120ms). At this time: the sensor signal is transmitted to the PLC controller via wireless transmission unit 5-2 (delay 85ms). After filtering and amplification by signal processing unit 1-2, the signal is confirmed to be valid by delay judgment unit 1-3 after 80ms. The PLC controller immediately controls Q0.0 to output a high level (delay 10ms), energizing the AC contactor coil of high voltage power-off unit 3-2, disconnecting the high voltage power supply of the X-ray flaw detector, and stopping the radiation device; at the same time, it controls Q0.1 to output a high level (delay 10ms), locking the electromagnetic lock of equipment locking unit 3-1.

[0064] At this time, the alarm and recording process is carried out simultaneously. The audible and visual alarm unit 4-1 at entrance 2 is triggered (red flashing + alarm sound); the LED light of the remote prompt unit 4-2 lights up and the buzzer sounds, and the touch screen pops up a pop-up window saying "Personnel have mistakenly entered entrance 2, and the machine has been stopped"; the PLC controller writes the event information (2024-XX-XX 09:45:32, entrance 2, through beam 0, diffuse reflection 1, stopped 1, not unlocked) to the SD card.

[0065] Based on the above operations, the total response time from personnel accidentally entering to the shutdown of the radiation device was measured to be: 120ms (signal duration) + 85ms (transmission delay) + 10ms (PLC action) = 215ms, which can achieve the design goal of completing the trigger action in 200ms (there are some errors due to interference from the on-site environment).

[0066] Step S104, Reset and Restart Phase: Staff carrying authorized terminals arrive at entrance 2. After confirming that personnel have evacuated and there are no obstructions, they return to the remote control room and enter the unlock password "1234ABCD" on the touchscreen. After the PLC controller receives and verifies the password, it controls Q0.1 to output a low level, unlocking the electromagnetic lock. Clicking "Retest" causes the system to retest each module. After confirming that there are no faults, the touchscreen displays "System Ready". The staff presses the X-ray flaw detector start button, and the X-ray device resumes operation. The duty record unit 4-3 simultaneously records "Unlocking Personnel ID: XXX, Unlocking Time: 2024-XX-XX 09:50:15".

[0067] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An infrared radiation protection system for in-situ radiographic inspection, characterized in that, The application relates to a remote interlocking control system for a mobile radiation detection area. The system comprises: an infrared detection module arranged at multiple entrance positions of a mobile radiation detection area, which is used for detecting whether a person enters the entrance position of the mobile radiation detection area in real time, and obtaining a sensing signal, wherein a radiation device is arranged in the mobile radiation detection area; a remote interlocking control module connected with the infrared detection module through a signal transmission module, which is used for receiving the sensing signal and determining a person entering state, wherein the signal transmission module is used for transmitting the sensing signal; a radiation shutdown module connected with the remote interlocking control module through the signal transmission module, and the radiation shutdown module is also connected with the radiation device; 2. An infrared radiation protection system for in-situ radiographic inspection according to claim 1, characterized in that the remote interlocking control module sends a shutdown instruction to the radiation shutdown module through the signal transmission module based on the person entering state, and the radiation shutdown module controls the radiation device to stop emitting radiation based on the shutdown instruction. The remote interlocking control module comprises: a signal processing unit comprising an RC low-pass filter circuit and an operational amplifier circuit, the RC low-pass filter circuit receives the sensing signal through the signal transmission module, filters high-frequency signals, and obtains low-frequency signals, the RC low-pass filter circuit is connected with the operational amplifier circuit, and the operational amplifier circuit is used for converting the low-frequency signals into standard signals with a voltage of 0-5V; 3. An infrared radiation protection system for in-situ radiographic inspection according to claim 2, wherein a PLC controller connected with the signal processing unit, which receives the standard signals and judges the person entering state based on the standard signals, wherein the standard signals are in a high potential when a person enters, and the PLC controller sends a shutdown instruction through the signal transmission module, and the standard signals are in a low potential when a person does not enter. The remote interlocking control module further comprises:

4. An infrared radiation protection system for in-situ radiographic inspection according to claim 3, wherein a time delay judgment unit connected with the PLC controller, which judges a time when the standard signals are in a high potential based on the standard signals, and corrects the person entering state output by the PLC controller to a state that a person does not enter when the time when the standard signals are in a high potential is less than a preset time, wherein the preset time is 50-100 ms. The radiation shutdown module comprises:

5. An infrared radiation protection system for in-situ radiographic inspection according to claim 4, wherein a high-voltage power-off unit comprising an AC contactor, the AC contactor is connected with the PLC controller and receives the shutdown instruction sent by the PLC controller, the AC contactor is powered on in the case of receiving the shutdown instruction, the AC contactor is also connected with a high-voltage power supply loop of the radiation device, and the contact of the AC contactor connected with the high-voltage power supply loop is disconnected in the case of the contact coil being powered on, so that the high-voltage power supply loop is disconnected. The radiation shutdown module comprises:

6. An infrared radiation protection system for field radiographic inspection according to claim 1, wherein a device locking unit comprising a magnetic lock, the magnetic lock is connected with the high-voltage power supply loop and a start button of the radiation device, and the magnetic lock triggers a strong magnetic force to lock the start button of the radiation device in the case of the high-voltage power supply loop being disconnected. The infrared detection module comprises: a plurality of infrared sensors, which are uniformly arranged on both sides of each entrance position of the mobile radiation detection area, the detection direction is parallel to the entrance, and the detection distance is greater than 1 m. The infrared sensor is installed at the upper end of each entrance of the mobile detection area, and the detection direction is towards the ground, and the detection distance is greater than two meters.

7. An infrared radiation protection system for field radiographic inspection according to claim 1, wherein The infrared radiation protection system further comprises: The guard auxiliary module is connected with the remote interlocking control module, and the remote interlocking control module sends an alarm instruction to the guard auxiliary module when sending a shutdown instruction, and the guard auxiliary module sends alarm information based on the alarm instruction.

8. An infrared radiation protection system for field radiographic inspection according to claim 7, characterized in that The guard auxiliary module comprises: The audible and visual alarm unit is connected with the remote interlocking control module and sends an audible and visual alarm when receiving an alarm instruction; The remote prompting unit is connected with the remote interlocking control module and sends a prompt sign to the terminal of the remote control room when receiving an alarm instruction; The guard recording unit is connected with the remote interlocking control module and obtains the time of the alarm instruction and the time when the radiation shutdown module stops when receiving an alarm instruction.

9. A control method of an infrared radiation protection system for in-situ radiographic inspection, applied to the infrared radiation protection system for in-situ radiographic inspection according to any one of claims 1 to 8, characterized in that, Comprise: S1, preparation before operation The remote interlocking control module performs system self-checking on the infrared detection module, the radiation shutdown module and the guard auxiliary module; In the case that the self-checking is qualified, the radiation device in the mobile detection area is started, wherein the qualified self-checking indicates that the infrared detection module has no sensing signal formed by continuous shielding, the radiation shutdown module has no action of stopping the radiation device, and the guard auxiliary module has no fault alarm action; S2, real-time monitoring The infrared detection module monitors whether personnel enter the entrance position of the mobile detection area in real time, obtains a sensing signal, and sends the sensing signal to the remote interlocking control module; The remote interlocking control module determines a personnel entering state based on the sensing signal; S3, interlocking shutdown In the case that the personnel entering state is that personnel enter, the radiation shutdown module controls the radiation device to stop emitting radiation and locks the start button of the radiation device; In the case that the personnel entering state is that personnel enter, the guard auxiliary module sends alarm information and records the time information when the radiation device stops; S4, reset and restart In the case that the personnel entering state lasts for more than 10 minutes and an authorized password input by a worker is obtained, the remote interlocking control module re-performs system self-checking on the infrared detection module, the radiation shutdown module and the guard auxiliary module.

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