A multi-source device automatic irradiation system and method based on PLC

Abstract

The application relates to a PLC-based multi-source device automatic irradiation system, which comprises a source tank turntable, a shutter, an attenuator, 241 An Am container and a control module, wherein the control module takes a PLC as a controller, contains a network interface, an RS485 communication module and a digital quantity input / output module, and is used for realizing interconnection of the control module with an upper computer, a multi-source device, a trolley device, an environmental instrument and a safety interlocking device. The application also relates to a PLC-based multi-source device automatic irradiation method, which can automatically complete sequential irradiation of multiple measuring points according to an experimental process designed by a user on an upper computer interface. The multi-source device automatic irradiation method contains a safety interlocking function, and a safety interlocking process is triggered when a safety interlocking event is triggered or a multi-source device fault occurs during automatic irradiation. The multi-source device automatic irradiation method also contains an environmental control function, and an environmental control process is triggered when environmental conditions change and exceed a specified range during automatic irradiation.

Description

Technical Field

[0001] This invention belongs to the field of reference radiation field construction technology, specifically relating to a PLC-based automatic irradiation system and method for multi-source devices. Background Technology

[0002] With the rapid development of nuclear technology in various fields such as industry, medicine, agriculture, environmental protection, and public safety in my country, radiation monitoring has attracted increasing attention, and various gamma-ray radiation monitoring instruments have emerged. To ensure the accuracy of the measurements from these monitoring instruments, it is necessary to establish a gamma-ray reference radiation field and transfer the measurements through calibration. This provides a basis for analyzing, judging, and controlling dose levels, thereby effectively ensuring the safety of workers engaged in radiation work.

[0003] Multi-source devices are an important component of the reference radiation field, and their function is to drive the radiation source to perform emission and return operations. Multi-source devices need to incorporate a safety interlock system to ensure the personal safety of experimental personnel. In recent years, with the development and technological innovation of PLCs, PLCs have been widely used in the control of various devices in the gamma reference radiation field. Multi-source irradiation devices based on PLCs can also meet the requirements of accuracy and reliability, but the control system still has the following problems: (1) The electrical components of the device often do not have fault alarm functions. When the motors, solenoid valves and other components in the device malfunction, the operators cannot detect it in time, which creates a certain risk; (2) The system has a low level of intelligence and lacks the display, adjustment and control of environmental conditions; (3) The automation level is low and it does not have the function of experimental personnel to design the experimental process and the automatic operation function of the irradiation device. When conducting experiments with the same steps, personnel need to perform a lot of repetitive operations, which increases the possibility of human error. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a PLC-based automatic irradiation system and method for multi-source devices, so as to achieve a safe, intelligent, and highly automated irradiation device control scheme.

[0005] To achieve the above objectives, the technical solution adopted by this invention is: a PLC-based multi-source automatic irradiation system, comprising: a source tank turntable, a shutter, an attenuator, and... 241 The Am container and control module include a source tank turntable connected to a turntable servo motor, with an origin switch at its origin position for positioning the source tank turntable. The shutter is connected to a shutter solenoid valve, with shutter closed and open switches at its closed and open positions, respectively. The attenuator is connected to an attenuator solenoid valve, with attenuator closed and open switches at its closed and open positions, respectively. 241 Am container and 241Am solenoid valve connection, its closed position and open position are respectively provided with 241 Am is in the closed position switch, 241 Am open position switch; the control module is respectively connected to the turntable servo motor, the shutter solenoid valve and the... 241 Am solenoid valve connection to control the rotation of the source slot turntable and the shutter, attenuator, 241 Opening or closing the Am container.

[0006] Furthermore, the control module includes an air switch, a first switching power supply, a second switching power supply, a DC power distribution terminal, a first external power supply terminal, a second external power supply terminal, a source slot turntable servo driver, a PLC, PLC digital output terminals, an RS485 bus terminal, a main power terminal, a neutral terminal, a grounding terminal, a relay, and PLC digital input terminals. The PLC includes a CPU module, an RS485 communication module, and a digital input / output module. The external power line enters the control circuit through the main power terminal. The live wire enters different electrical devices through the air switch. The neutral wire enters different devices through the neutral terminal. The ground wire enters different electrical devices through the grounding terminal. The first switching power supply powers the PLC through the DC power distribution terminal and simultaneously powers each solenoid valve and safety interlock electrical component through the first external power supply terminal. The second... The switching power supply powers the pan-tilt camera in the laboratory via the second external power supply terminal. The source slot turntable servo driver and the PLC communicate via pulse commands. The CPU module processes the acquired signals according to the written program and outputs signals to the servo driver, each solenoid valve, and each relay. The CPU module includes a network interface for remote connection between the PLC and the host computer interface and the trolley controller. The RS485 communication module is connected to the temperature and humidity transmitter and atmospheric pressure transmitter in the laboratory via the RS485 bus terminal for querying and recording changes in temperature, humidity, and atmospheric pressure in the laboratory. The digital input / output module is used to connect the CPU module to external devices. External sensor signals enter the PLC via the PLC digital input terminal, and CPU control signals are connected to the electrical equipment via the PLC digital output terminal.

[0007] Furthermore, the control module is also equipped with two three-hole sockets for supplying power to the equipment in the control room when needed.

[0008] Furthermore, the turntable servo motor is controlled by pulse commands. When the turntable servo motor rotates, its encoder records the motor rotation angle and feeds this information back to the source slot turntable servo driver, thus forming a closed-loop position control.

[0009] Furthermore, the shutter solenoid valve is a single-electrically controlled pneumatic solenoid valve, powered by an external air compressor. When the shutter solenoid valve is energized, the shutter opens; when the power is off, the shutter closes. The shutter open-end switch and the shutter close-end switch are magnetic switches, fixed to the shutter cylinder, providing the PLC with the shutter's open and closed states.

[0010] Furthermore, the attenuator solenoid valve is a single electrically controlled pneumatic solenoid valve, powered by an external air compressor. When the attenuator solenoid valve is energized, the attenuator opens; when the power is off, the attenuator closes. The attenuator open and closed switches are magnetic switches, fixed to the cylinder of the attenuator, providing the PLC with the attenuator's open and closed states.

[0011] Furthermore, the aforementioned 241 The Am solenoid valve is a single electrically controlled pneumatic solenoid valve, powered by an external air compressor. 241 When the Am solenoid valve is energized, the following is stated: 241 Am is turned on, as described when power is off. 241 Am is off; the aforementioned 241 Am open position switch, the aforementioned 241 The Am closed position switch uses a magnetic switch and is fixed to the [missing information]. 241 On Am's cylinder, a supply is provided for the PLC. 241 Am's on / off state.

[0012] This invention also provides an automatic irradiation method for a multi-source device based on a PLC, comprising the following steps:

[0013] S1. Design the experimental process on the host computer interface, and input the total number of steps in the experimental process and the variables for each experimental step.

[0014] S2, the PLC reads the set experimental process variables, starting from the first experimental step, sends the target position of the trolley to the trolley controller, and sends feedback to the PLC after the trolley moves into place;

[0015] S3, after the target position is moved into place, the PLC sends the target source to the multi-source device. Based on this information, the multi-source device rotates the source slot turntable or drives... 241 Am solenoid valve;

[0016] S4. After the target source is in place, the PLC controls the shutter solenoid valve to open and irradiation begins. At the same time, the irradiation time timer is activated. When the timer reaches the preset time, the PLC controls the shutter solenoid valve to close and the irradiation ends. At the same time, the interval time timer is activated.

[0017] S5, When the interval timer reaches the preset value, the first irradiation of the current experimental step is completed. Repeat steps S3 and S4 according to the set number of repetitions.

[0018] S6, the PLC reads the variable information for the next experimental step, and repeats steps S2, S3, S4, and S5 until all steps are completed.

[0019] Furthermore, during the automatic operation of the PLC-based multi-source device automatic illumination method, if the shielding door is closed and disconnected, the infrared detector detects personnel activity, the emergency stop button is pressed, or the source device malfunctions, the safety interlock process is triggered.

[0020] Furthermore, the safety interlock process includes: determining whether the emergency stop button and infrared detection signal are disconnected and whether the shielding door is closed. If the above conditions are met, the solenoid valve can be remotely controlled; otherwise, the safety mode is activated, the solenoid valve is closed and locked, and the PLC outputs an alarm to the host computer interface to indicate that the current safety interlock has been responded to.

[0021] Determine whether the solenoid valve opening button in the host computer interface has been clicked. If it has been clicked, the PLC outputs voltage to the corresponding solenoid valve, which drives the cylinder to move under the push of the external air source. At the same time, the opening fault judgment timer inside the PLC is activated. The timer is set to 5 seconds.

[0022] After the accumulated time of the fault diagnosis timer reaches the set value of 5 seconds, if the solenoid valve is fully open and closed, it indicates that the solenoid valve opening function is normal, and the solenoid valve timer is activated. If the solenoid valve is fully open and open, it indicates an opening fault, the fault handling program is started, the PLC controls the solenoid valve to close and lock, and a fault alarm is sent to the host computer interface.

[0023] When the cumulative time of the timer reaches the user-set value or the close button on the host computer interface is clicked, the PLC closes the solenoid valve and activates the internal close fault judgment timer of the PLC. The timer is set to 5 seconds.

[0024] If the solenoid valve closes completely after the cumulative timer for fault detection reaches the set value of 5 seconds, it indicates that the solenoid valve's closing function is normal; otherwise, it indicates a closing fault. If the solenoid valve fails to close, the fault handling program is activated. The PLC stops outputting signals to the faulty solenoid valve and rotates the source tank turntable to the neutral position to ensure the safety of the experimenters. At the same time, a fault alarm is sent to the host computer interface.

[0025] Furthermore, during the automatic operation of the PLC-based multi-source device automatic irradiation method, if the environmental conditions change and exceed the specified range, the environmental control process is triggered.

[0026] Furthermore, the environmental control process is as follows: when the PLC detects that the laboratory temperature and atmospheric pressure are out of range, it will issue an alarm on the host computer interface; when the humidity is greater than 75%, the PLC will drive the dehumidifier control relay to turn on the dehumidifier; when the humidity is less than 70%, the dehumidifier will turn off.

[0027] The advantages of this invention are: it integrates safety interlocking and environmental control into the control of multi-source devices, improving the reliability and intelligence of the devices; when a multi-source device malfunctions, relevant information is displayed on the control panel and unsafe operations are restricted, ensuring the safety of experimental personnel; according to the experimental procedure input by the user on the host computer interface, the PLC controls the multi-source devices and trolley to automatically move to the set position and perform irradiation operations, improving the automation level of the trolley device and reducing repetitive labor for experimental personnel. Attached Figure Description

[0028] Figure 1 This is a main diagram showing the distribution of electrical components of a multi-source device in a PLC-based multi-source automatic illumination system.

[0029] Figure 2 This is a top view of the electrical component distribution of a multi-source device in a PLC-based multi-source automatic illumination system.

[0030] Figure 3 This is a schematic diagram of the control module of a multi-source device in a PLC-based automatic irradiation system for multi-source devices.

[0031] Figure 4 This is a signal flow diagram of the control circuit of a multi-source device in a PLC-based multi-source device automatic illumination system.

[0032] Figure 5 This is a PLC algorithm flowchart for the control and fault handling of a single-electro-controlled solenoid valve;

[0033] Figure 6 This is a flowchart illustrating an automatic irradiation method for multi-source devices based on PLC.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Turntable servo motor; 2. Shutter solenoid valve; 3. Attenuator solenoid valve; 4. 241 5. Am solenoid valve; 6. Shutter closed switch; 7. Shutter open switch; 8. Attenuator closed switch; 9. Attenuator open switch; 241 Am is in the closed position; 10. 24111. Home switch; 12. Air switch; 13. First switching power supply; 14. Second switching power supply; 15. DC power distribution terminal; 16. First external power supply terminal; 17. Second external power supply terminal; 18. Source slot turntable servo driver; 19. PLC; 20. PLC digital output terminal; 21. Relay terminal; 22. RS485 bus terminal; 23. Main power terminal; 24. Neutral terminal; 25. Grounding terminal; 26. Socket; 27. Relay; 28. PLC digital input terminal. Detailed Implementation

[0036] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0037] like Figure 1-4 As shown, this invention proposes a PLC-based multi-source automatic irradiation system, which includes: a source tank turntable, a shutter, an attenuator, and... 241 The Am container and control module include a source tank turntable connected to a turntable servo motor 1, with an origin switch 11 at its origin position to facilitate positioning of the source tank turntable. A shutter is connected to a shutter solenoid valve 2, with a shutter closed switch 5 and a shutter open switch 6 at its closed and open positions, respectively. An attenuator is connected to an attenuator solenoid valve 3, with an attenuator closed switch 7 and an attenuator open switch 8 at its closed and open positions, respectively. 241 Am container and 241 Am solenoid valve 4 is connected, and its closed and open positions are respectively equipped with 241 Am is in the closed position switch 9. 241 Am is in position switch 10; the control module is connected to the turntable servo motor 1, shutter solenoid valve 2 and... 241 Am solenoid valve 4 is connected to control the rotation of the source slot turntable and the shutter, attenuator, etc. 241 Opening or closing the Am container.

[0038] Furthermore, the control module includes an air switch 12, a first switching power supply 13, a second switching power supply 14, a DC power distribution terminal 15, a first external power supply terminal 16, a second external power supply terminal 17, a source slot turntable servo driver 18, a PLC 19, a PLC digital output terminal 20, an RS485 bus terminal 22, a main power connection terminal 23, a neutral wire terminal 24, a grounding terminal 25, a relay 27, and a PLC digital input terminal 28. The PLC 19 includes a CPU module, an RS485 communication module, and a digital input / output module.

[0039] The external power supply line enters the control circuit through the main power terminal 23. The live wire goes to different electrical devices through the air switch 12, the neutral wire goes to different devices through the neutral terminal 24, and the ground wire goes to different electrical devices through the grounding terminal 25. The first switching power supply 13 supplies power to the PLC 19 through the DC power distribution terminal 15, and simultaneously supplies power to each solenoid valve and safety interlock electrical component through the first external power supply terminal 16. The second switching power supply 14 supplies power to the pan-tilt camera in the laboratory through the second external power supply terminal 17. The source slot turntable servo driver 18 communicates with the PLC using pulse instructions. The CPU module processes the data according to the written program. The received signals are processed and output to the servo driver, each solenoid valve, and each relay 27. The CPU module includes a network interface for remote connection between the PLC19 and the host computer interface and the trolley controller. The RS485 communication module is connected to the temperature and humidity transmitter and atmospheric pressure transmitter in the laboratory via the RS485 bus terminal 22 for querying and recording the temperature, humidity, and atmospheric pressure changes in the laboratory. The digital input / output module connects the CPU module to external devices. External sensor signals enter the PLC via the PLC digital input terminal 28, and CPU control signals are connected to the electrical equipment via the PLC digital output terminal 20.

[0040] It is understandable that the CPU module outputs the processed signal to the relay 27 through the relay terminal 21.

[0041] Furthermore, the control module is equipped with two three-hole sockets 26 for supplying power to the equipment in the control room when needed.

[0042] In this embodiment, the turntable servo motor 1 is controlled by pulse commands. When the turntable servo motor 1 rotates, its encoder records the motor rotation angle and feeds this information back to the source slot turntable servo driver 18, thus forming a closed-loop position control and ensuring the precise positioning of the source slot turntable. The origin switch 11 is a photoelectric switch that provides physical origin information for the source slot turntable, ensuring that the actual angle is consistent with the output angle of PLC 19.

[0043] The shutter solenoid valve 2 is a single-electrically controlled pneumatic solenoid valve, powered by an external air compressor. When the shutter solenoid valve 2 is energized, the shutter opens; when the power is off, the shutter closes, ensuring that the shutter remains closed when power is off and preventing potential safety hazards. The shutter open / close switch 6 and shutter close / close switch 5 are magnetic switches fixed to the shutter cylinder, providing the PLC19 with the shutter's open and closed states.

[0044] The attenuator solenoid valve 3 is a single-electrically controlled pneumatic solenoid valve, powered by an external air compressor. When the attenuator solenoid valve 3 is energized, the attenuator opens; when the power is off, the attenuator closes. The attenuator open-end switch 8 and the attenuator closed-end switch 7 are magnetic switches, fixed to the attenuator cylinder, providing the PLC with the attenuator's open and closed states.

[0045] because 241 The gamma rays produced by the Am radioactive source have low energy. To avoid interference from other radioactive sources with its radiation field, 241 The Am container is installed at the front of the multi-source device. 241 Am solenoid valve 4 is a single electrically controlled pneumatic solenoid valve, powered by an external air compressor. 241 When Am solenoid valve 4 is energized 241 Am is open, when power is off 241 Am is off, ensuring safety during power outages. 241 Am is in the off state to avoid creating safety hazards. 241 Am is in position switch 10. 241 Am closed position switch 9 adopts a magnetic switch and is fixed to 241 On the Am cylinder, provide for the PLC 241 Am's on / off state.

[0046] In this example, the sensors connected to PLC digital input terminal 28 are: source slot turntable origin 11, shutter closed position switch 5, shutter open position switch 6, attenuator closed position switch 7, attenuator open position switch 8. 241 Am is in the closed position switch 9. 241 Am open position switch 10, emergency stop button, area gamma monitor alarm, infrared detector alarm, shielding door open position switch, shielding door closed position switch.

[0047] In this example, the devices connected to PLC digital output terminal 20 are: shutter solenoid valve 2, attenuator solenoid valve 3, 241 Am solenoid valve 4, alarm indicator light, locking shielding door open relay, locking shielding door close relay.

[0048] It is understandable that the entire system can be divided into three parts: the multi-source device control part, the safety interlock part, and the laboratory environment control part.

[0049] In the multi-source device control section, the PLC19 acts as the controller, with two input sources: a host computer interface and field sensors. The host computer interface communicates with the PLC via Ethernet protocol, enabling control of the source slot turntable, shutter, attenuator, etc. 241Am's remote control. The host computer interface includes a target source input, source slot turntable movement button, stop button, return to origin button, and fault reset button to enable precise positioning, fault troubleshooting, and return to initial state of the source slot turntable. It also includes settings for shutter, attenuator, and... 241 The Am button has an on / off button and an on / off time setting to control the shutter speed, attenuator, and... 241 Am's on / off state and timed shutdown. Field sensors are connected to the PLC via digital input modules, including origin switches, shutter open / close switches, attenuator open / close switches, etc. 241 The Am on / off position switch provides the PLC with the actual status of the device. The PLC outputs in the multi-source device control section include: the source slot turntable servo driver and field devices. Based on the written program, the PLC converts the target source information into signal pulses and direction pulses, outputting them to the servo driver. As the servo motor rotates, its encoder records the motor's rotation angle and feeds this information back to the servo driver, thus forming a closed-loop position control and ensuring precise positioning of the source slot turntable. Field devices include: shutter solenoid valve 2, attenuator solenoid valve 3, and... 241 Am solenoid valve 4, all adopt single-electro-controlled pneumatic solenoid valves. For safety considerations, shutter solenoid valve 2 and... 241 Am solenoid valve 4 is interlocked and cannot be opened simultaneously.

[0050] In the safety interlock system, the PLC acts as the controller, with inputs from field sensors, including: emergency stop buttons, infrared detection, area gamma monitoring, and platform screen door open / close status. PLC outputs include: alarm indicator lights, platform screen door open relay, and platform screen door close relay. The safety interlock includes: 1) When the PLC detects the emergency stop button is closed or infrared sensors detect personnel activity, it closes the shutter and... 241 When the Am solenoid valve opens the shielding door, the shielding door closing relay is simultaneously energized, preventing the shielding door from closing. 2) The shutter can only be operated when the PLC detects the shielding door being fully closed. 241 Am. 3) When the shutter is open or the area gamma monitor alarms, the PLC outputs a signal to the alarm indicator and locks the shielding door opening relay to remind personnel not to enter.

[0051] In the environmental control system, the PLC collects data from the temperature, humidity, and atmospheric pressure transmitters in the laboratory via an RS485 communication module and records it on the host computer interface. According to the environmental requirements in JJG 393, the temperature must be maintained between 15 and 25°C, with a variation not exceeding ±2°C; humidity must not exceed 80%; and atmospheric pressure must be between 86 and 106 kPa. When the PLC detects that the laboratory temperature or atmospheric pressure exceeds the specified range, it will issue an alarm on the host computer interface. When the humidity exceeds 75%, the PLC will drive the dehumidifier control relay to turn on the dehumidifier; when the humidity falls below 70%, the dehumidifier will turn off.

[0052] like Figure 5-6 As shown, the present invention also provides an automatic irradiation method for a multi-source device based on a PLC, comprising the following steps:

[0053] S1. Design the experimental process on the host computer interface, and input the total number of steps in the experimental process and the variables for each experimental step.

[0054] Specifically, the user designs the experimental procedure on the host computer interface, inputting the total number of steps N and the variables for each experimental step, namely the target position R of the trolley. i (i = 1, 2, ..., N), target source P i Irradiation time T i Number of repeated irradiations M i Interval time Tp i All the above parameter settings will be saved to the industrial computer and do not need to be set again.

[0055] S2, the PLC reads the set experimental process variables, starting from the first experimental step, sends the target position of the trolley to the trolley controller, and sends feedback to the PLC after the trolley moves into place;

[0056] Specifically, the PLC reads the pre-set experimental process variables and, starting from the first experimental step, first sends the trolley target position R. i The trolley controller moves to the correct position and sends feedback to the PLC.

[0057] S3, after the target position is moved into place, the PLC sends the target source to the multi-source device. Based on this information, the multi-source device rotates the source slot turntable or drives... 241 Am solenoid valve;

[0058] Specifically, target location R i After the movement is completed, the PLC sends the target source P. i The multi-source device, based on this information, rotates the source slot turntable or drives... 241 Am solenoid valve.

[0059] S4. After the target source is in place, the PLC controls the shutter solenoid valve to open and irradiation begins. At the same time, the irradiation time timer is activated. When the timer reaches the preset time, the PLC controls the shutter solenoid valve to close and the irradiation ends. At the same time, the interval time timer is activated.

[0060] Specifically, target source P i Once in position, the PLC controls the shutter solenoid valve to open, and irradiation begins, simultaneously activating the irradiation timer. The irradiation continues until the timer reaches the preset time T. i Afterwards, the PLC controls the shutter solenoid valve to close, ending the irradiation, and simultaneously activates the interval timer.

[0061] S5. When the interval timer reaches the preset value, the first irradiation of the current experimental step is completed. Repeat steps S3 and S4 according to the set number of repetitions.

[0062] Specifically, when the interval timer reaches the preset value Tp i After that, the first irradiation of the current experimental step is completed, and the number of repetitions M is set by the user. i Repeat M i Next steps S3 and S4.

[0063] S6, the PLC reads the variable information for the next experimental step, and repeats steps S2, S3, S4, and S5 until all steps are completed.

[0064] Specifically, the PLC reads the variable information for the next experimental step and repeats steps S2, S3, S4, and S5 until all N steps are completed.

[0065] Furthermore, during the automatic operation of the PLC-based multi-source device automatic illumination method, if the shielding door is closed and disconnected, the infrared detector detects personnel activity, the emergency stop button is pressed, or the source device malfunctions, the safety interlock process is triggered.

[0066] Furthermore, during the automatic operation of the PLC-based multi-source device automatic irradiation method, if environmental conditions change and exceed the specified range, the environmental control process is triggered.

[0067] Furthermore, the safety interlocking process includes:

[0068] Determine whether the emergency stop button and infrared detection signal are disconnected and whether the shielding door is closed. If the above conditions are met, the solenoid valve can be remotely controlled. Otherwise, the safety mode is activated, the solenoid valve is closed and locked, and the PLC outputs an alarm to the host computer interface, indicating that the current safety interlock has been responded to.

[0069] Determine whether the solenoid valve opening button in the host computer interface has been clicked. If it has been clicked, the PLC outputs voltage to the corresponding solenoid valve, which drives the cylinder to move under the push of the external air source. At the same time, the opening fault judgment timer inside the PLC is activated. The timer is set to 5 seconds.

[0070] After the accumulated time of the fault diagnosis timer reaches the set value of 5 seconds, if the solenoid valve is fully open and closed, it indicates that the solenoid valve opening function is normal, and the solenoid valve timer is activated. If the solenoid valve is fully open and open, it indicates an opening fault, the fault handling program is started, the PLC controls the solenoid valve to close and lock, and a fault alarm is sent to the host computer interface.

[0071] When the cumulative time of the timer reaches the user-set value or the close button on the host computer interface is clicked, the PLC closes the solenoid valve and activates the internal close fault judgment timer of the PLC. The timer is set to 5 seconds.

[0072] If the solenoid valve closes completely after the cumulative timer for fault detection reaches the set value of 5 seconds, it indicates that the solenoid valve's closing function is normal; otherwise, it indicates a closing fault. If the solenoid valve fails to close, the fault handling program is activated. The PLC stops outputting signals to the faulty solenoid valve and rotates the source tank turntable to the neutral position to ensure the safety of the experimenters. At the same time, a fault alarm is sent to the host computer interface.

[0073] Furthermore, the environmental control process is as follows: when the PLC detects that the laboratory temperature and atmospheric pressure are out of range, it will issue an alarm on the host computer interface; when the humidity is greater than 75%, the PLC will drive the dehumidifier control relay to turn on the dehumidifier; when the humidity is less than 70%, the dehumidifier will turn off.

[0074] As can be seen from the above embodiments, the present invention combines safety interlocking and environmental control into the control of multi-source devices, which improves the reliability and intelligence of the devices. When the multi-source devices malfunction, relevant information is displayed on the control panel and unsafe operations are restricted to ensure the safety of experimental personnel. According to the experimental process input by the user on the host computer interface, the PLC controls the multi-source devices and trolley to automatically move to the set position and perform irradiation operations, which improves the automation level of the trolley device and reduces repetitive labor for experimental personnel.

[0075] The present invention is not limited to the embodiments described in the specific implementation. Other implementation methods derived by those skilled in the art based on the technical solution of the present invention also fall within the scope of the technical innovation of the present invention.

Claims

1. A PLC-based multi-source automatic irradiation system, characterized in that, include: Source slot turntable, shutter, attenuator, 241 The Am container and control module, the source tank turntable is connected to the turntable servo motor, and an origin switch is set at its origin position to realize the positioning of the source tank turntable. The irradiation method of the PLC-based multi-source automatic irradiation system includes the following steps: S1. Design the experimental process on the host computer interface, and input the total number of steps in the experimental process and the variables for each experimental step. S2, the PLC reads the set experimental process variables, starting from the first experimental step, sends the target position of the trolley to the trolley controller, and sends feedback to the PLC after the trolley moves into place; S3, after the target position is moved into place, the PLC sends the target source to the multi-source device, and the multi-source device rotates the source slot turntable or drives... 241 Am solenoid valve; S4. After the target source is in place, the PLC controls the shutter solenoid valve to open and irradiation begins. At the same time, the irradiation time timer is activated. When the timer reaches the preset time, the PLC controls the shutter solenoid valve to close and the irradiation ends. At the same time, the interval time timer is activated. S5, When the interval timer reaches the preset value, the first irradiation of the current experimental step is completed. Repeat steps S3 and S4 according to the set number of repetitions. S6, the PLC reads the variable information for the next experimental step, and repeats steps S2, S3, S4, and S5 until all steps are completed. The safety interlock process includes: Determine whether the emergency stop button and infrared detection signal are disconnected and whether the shielding door is closed. If the above conditions are met, remote control of the solenoid valve is performed; otherwise, the safety mode is activated, the solenoid valve is closed and locked, and the PLC outputs an alarm to the host computer interface, indicating that the current safety interlock has been responded to. Determine whether the solenoid valve opening button in the host computer interface has been clicked. If it has been clicked, the PLC outputs voltage to the corresponding solenoid valve, which drives the cylinder to move under the push of the external air source. At the same time, the opening fault judgment timer inside the PLC is activated. The timer is set to 5 seconds. After the cumulative time of the fault judgment timer reaches the set value of 5 seconds, if the solenoid valve is fully open and closed, it means that the solenoid valve opening function is normal and the solenoid valve timer is activated. If the solenoid valve is fully open and closed, it means that the opening is faulty and the fault handling program is started. The PLC controls the solenoid valve to close and lock, and at the same time sends a fault alarm to the host computer interface. When the cumulative time of the timer reaches the user-set value or the close button on the host computer interface is clicked, the PLC closes the solenoid valve and activates the internal close fault judgment timer, which is set to 5 seconds. After the cumulative time of the fault judgment timer reaches the set value of 5 seconds, if the solenoid valve is closed in place, it indicates that the solenoid valve closing function is normal; otherwise, it indicates a closing fault. If the solenoid valve closing fault occurs, the fault handling program is started, the PLC stops outputting signals to the faulty solenoid valve, and the source tank turntable is rotated to the empty position to ensure the safety of the experimental personnel. At the same time, a fault alarm is sent to the host computer interface.

2. The automatic irradiation system based on a PLC multi-source device as described in claim 1, characterized in that: The shutter is connected to a shutter solenoid valve, and its closed and open positions are respectively equipped with a shutter-closed switch and a shutter-open switch. The attenuator is connected to an attenuator solenoid valve, and its closed and open positions are respectively equipped with an attenuator-closed switch and an attenuator-open switch. 241 Am container and 241 Am solenoid valve connection, its closed position and open position are respectively provided with 241 Am is in the closed position switch, 241 Am open position switch; the control module is respectively connected to the turntable servo motor, the shutter solenoid valve and the... 241 Am solenoid valve connection to control the rotation of the source slot turntable and the shutter, attenuator, 241 Opening or closing the Am container.

3. The automatic irradiation system based on a PLC multi-source device as described in claim 1, characterized in that: The control module includes an air switch, a first switching power supply, a second switching power supply, a DC power distribution terminal, a first external power supply terminal, a second external power supply terminal, a source slot turntable servo driver, a PLC, PLC digital output terminals, an RS485 bus terminal, a main power terminal, a neutral terminal, a grounding terminal, a relay, and PLC digital input terminals. The PLC includes a CPU module, an RS485 communication module, and a digital input / output module. The external power supply line enters the control circuit through the main power terminal. The live wire goes to different electrical devices through the air switch, the neutral wire goes to different devices through the neutral terminal, and the ground wire goes to different electrical devices through the grounding terminal. The first switching power supply supplies power to the PLC through the DC power distribution terminal and also supplies power to each solenoid valve and safety interlock electrical component through the first external power supply terminal. The second switching power supply supplies power to the pan-tilt camera in the laboratory through the second external power supply terminal. The source slot turntable servo driver interacts with the PLC using pulse commands. The CPU module processes the acquired data according to the written program. The received signals are processed and output to the servo driver, each solenoid valve, and each relay. The CPU module includes a network interface for remote connection between the PLC and the host computer interface and the trolley controller. The RS485 communication module is connected to the temperature and humidity transmitter and atmospheric pressure transmitter in the laboratory via the RS485 bus terminal for querying and recording the temperature, humidity, and atmospheric pressure changes in the laboratory. The digital input / output module is used to connect the CPU module to external devices. External sensor signals enter the PLC through the PLC digital input terminal, and CPU control signals are connected to the electrical equipment through the PLC digital output terminal.

4. The automatic irradiation system based on a PLC multi-source device as described in claim 1, characterized in that: The control module also includes two three-hole sockets for supplying power to the equipment in the control room when needed.

5. The automatic irradiation system based on a PLC multi-source device as described in claim 3, characterized in that: The turntable servo motor is controlled by pulse commands. When the turntable servo motor rotates, its encoder records the rotation angle of the motor and feeds it back to the source slot turntable servo driver, forming a closed-loop control of the position.

6. The automatic irradiation system based on a PLC multi-source device as described in claim 3, characterized in that: The shutter solenoid valve is a single electrically controlled pneumatic solenoid valve, powered by an external air compressor. When the shutter solenoid valve is energized, the shutter opens; when the power is off, the shutter closes. The shutter open and shutter closed switches are magnetic switches, fixed to the shutter cylinder, to provide the PLC with the shutter's open and closed states.

7. The automatic irradiation system based on a PLC multi-source device as described in claim 3, characterized in that: The solenoid valve of the attenuator is a single electrically controlled pneumatic solenoid valve, and an external air compressor provides it with a power source. When the solenoid valve of the attenuator is energized, the attenuator opens, and when the power is off, the attenuator closes. The attenuator open and closed switches are magnetic switches, fixed to the cylinder of the attenuator, to provide the PLC with the open and closed states of the attenuator.

8. The automatic irradiation system based on a PLC multi-source device as described in claim 3, characterized in that: The 241 The Am solenoid valve is a single electrically controlled pneumatic solenoid valve, powered by an external air compressor. 241 When the Am solenoid valve is energized, the following is stated: 241 Am is turned on, as described when power is off. 241 Am is off; The 241 Am open position switch, the aforementioned 241 The Am closed position switch uses a magnetic switch and is fixed to the [specific location]. 241 On Am's cylinder, a supply is provided for the PLC. 241 Am's on / off state.

9. The automatic irradiation system based on a PLC multi-source device as described in claim 1, characterized in that: During the automatic operation of the PLC-based multi-source device automatic illumination method, if the shielding door is closed and disconnected, the infrared detector detects personnel activity, the emergency stop button is pressed, or the source device malfunctions, the safety interlock process is triggered.

10. The PLC-based multi-source automatic irradiation system as described in claim 1, characterized in that: If the environmental conditions change and exceed the specified range during the automatic operation of the PLC-based multi-source device automatic irradiation method, the environmental control process will be triggered.

11. The automatic irradiation system based on a PLC multi-source device as described in claim 10, characterized in that: The environmental control process is as follows: when the PLC detects that the laboratory temperature and atmospheric pressure are out of range, it will issue an alarm on the host computer interface; when the humidity is greater than 75%, the PLC will drive the dehumidifier control relay to turn on the dehumidifier; when the humidity is less than 70%, the dehumidifier will turn off.

Images