Automatic calibration equipment for radiation meter of nuclear power plant

Abstract

The invention discloses an automatic calibration device for a radiation meter of a nuclear power plant, and relates to the technical field of automatic calibration devices for radiation meters of nuclear power plants. The testing device comprises a support base, a testing rotary table module installed on the support base, a robot system adjacently installed on one side of the testing rotary table module and positioning carrier modules located on the two sides of the robot system. Wherein the test rotating disc module comprises a rotating disc support installed on the support base, a lifting piece installed on the rotating disc support, a radiation source installed on the lifting piece and a test rotating disc rotationally arranged on the rotating disc support, and a transmission piece used for driving the test rotating disc to rotate is arranged on the rotating disc support. The lifting part is provided with an annular housing used for shielding radiation of the radiation source. The method and the device have the effects of improving the calibration efficiency and precision, enhancing the operation safety and reducing manual intervention at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of automatic calibration of radiation doses, and in particular to an automatic calibration device for radiation meters in nuclear power plants. Background Art

[0002] In the nuclear industry, the calibration of personal dosimeters is crucial for ensuring worker health and safety. With the advancement of nuclear energy technology, nuclear power plant workers frequently enter radiation-controlled areas, placing higher demands on the accuracy and reliability of personal dosimeters. As key devices for monitoring radiation levels in workers' workplaces, the calibration of personal dosimeters directly impacts worker safety. To ensure the accuracy of personal dosimeters, nuclear power plants have established specialized metrology laboratories to regularly calibrate these devices and issue calibration certificates.

[0003] Currently, the calibration of personal dosimeters mainly relies on manual operations. Specific methods include, but are not limited to: placing the personal dosimeters to be calibrated one by one in a fixed test position, manually adjusting the state of the radiation source to complete the radiation dose detection, then using a camera to read or a physical interface to collect the dosimeter data, and finally recording and generating a calibration certificate. There are also methods of manually switching between different radiation intensities to verify the dosimeter response range, and using a specific wavelength light source to simulate the radiation environment to test the sensitivity of the dosimeter.

[0004] However, the traditional manual calibration method mentioned above has obvious defects. On the one hand, due to the influence of human factors, cheating is prone to occur in the calibration process, such as arbitrarily adjusting the radiation dose or tampering with the detection data, which affects the fairness and accuracy of the calibration results; on the other hand, each calibration can only process a single dosimeter, which is inefficient and time-consuming. During the calibration process, workers need to directly contact the radiation source, increasing potential health risks. Summary of the Invention

[0005] In order to improve the existing technology that relies on manual operation to perform calibration work, which has the problems of low efficiency, easy cheating and high radiation exposure risk, the present application provides an automatic calibration device for nuclear power plant radiation meters.

[0006] The present application provides an automatic calibration device for a nuclear power plant radiation meter using the following technical solutions: A nuclear power plant radiation meter automatic calibration device includes a bracket base, a test turntable module installed on the bracket base, a robot system installed adjacent to one side of the test turntable module, and positioning carrier modules located on both sides of the robot system; wherein, the test turntable module includes a rotating disk bracket installed on the bracket base, a lifting member installed on the rotating disk bracket, a radiation source installed on the lifting member, and a test turntable rotatably arranged on the rotating disk bracket, the rotating disk bracket is provided with a transmission member for driving the test turntable to rotate, and the lifting member is provided with an annular cover for shielding radiation from the radiation source.

[0007] By adopting the above technical solution, the automated calibration of radiation dosimeters in nuclear power plants is achieved. On the one hand, the efficiency of calibration is improved. Through the collaborative operation of the test turntable module and the robot system, multiple radiation dosimeters can be processed in batches, avoiding the tedious process of traditional manual calibration one by one. On the other hand, safety is improved. The radiation source is raised in an orderly manner when in use by using a lifting piece. When not in use, the shielding material on the annular cover effectively shields the radiation source, reducing the contact between operators and radioactive substances and effectively protecting the health of workers. Furthermore, the accuracy of calibration is enhanced. Through the precisely controlled rotation of the test turntable and the stable position of the radiation source, each dosimeter is guaranteed to obtain accurate radiation dose data during the calibration process.

[0008] Optionally, the positioning carrier module includes a base mounted on the bracket base, a fixture tray mounted on the base, and a special fixture mounted on the fixture tray, and the special fixture is arranged in a placement slot opened in a rectangular array on the fixture tray.

[0009] By adopting the above technical solution, through the combination of the base, the fixture tray and the special fixture, it is ensured that the personal dose radiometer to be calibrated can be stably placed and accurately identified, avoiding positioning errors during manual operation and improving the accuracy and consistency of calibration. The standard fixtures on the fixture tray are adapted to different models of personal dose radiometers, simplifying the operation process, reducing the carrier cost, and protecting the product surface to ensure that communication is not obstructed. In addition, combined with other modules to work together, batch automated calibration is realized, which improves the efficiency of calibration, reduces manual intervention, and reduces the risk of contact between calibrators and radiation sources.

[0010] Optionally, the robot system includes a six-axis robot rotatably arranged on a bracket base, a visual component installed on a robotic arm of the six-axis robot, and a gripping component arranged on an end effector of the six-axis robot, and the robotic arm of the six-axis robot is provided with an infrared measuring instrument for measuring distance.

[0011] By adopting the above technical solution, the six-axis robot can realize the automatic pick-up and placement operation of personal dose radiation meters. The visual component on the mechanical wall can accurately locate the target position, ensuring that the clamping component can accurately grasp the radiation meter on the special fixture. At the same time, the infrared measuring instrument installed on the mechanical wall can measure the distance in real time, avoiding the risk of collision, improving the safety and reliability of operation, thereby effectively improving calibration efficiency and reducing manual intervention during operation.

[0012] Optionally, a limit block is further provided on the base, the limit block abuts against a side of the jig tray, and a handle for extraction is fixed on the jig tray.

[0013] By adopting the above technical solution, limit blocks are set on all four sides of the jig tray to accurately limit the jig tray, ensuring that the jig tray is placed accurately on the base without offset, thereby improving the accuracy of subsequent robotic arm operations. After the calibration work is completed, it is also convenient for manual personnel to quickly extract the jig tray, improving the convenience and efficiency of the overall operation.

[0014] Optionally, an EPD infrared communicator is provided on the robotic arm of the six-axis robot, and a wireless communicator is provided on the rotating disk bracket.

[0015] By adopting the above technical solution, the EPD infrared communicator on the mechanical wall of the six-axis robot accurately reads the data on the personal dose radiation meter, avoiding the errors that may be caused by manual reading and improving the accuracy of data collection. The wireless communicator on the rotating bracket disk improves the automation level of the calibration system, reduces the manual operation process, effectively prevents cheating, effectively avoids direct contact between calibrators and radiation sources, ensures the safety of staff, and greatly improves calibration efficiency to meet the needs of batch calibration.

[0016] Optionally, positioning and clamping carriers for placing special fixtures are distributed on the circumference of the test turntable, and the angle between adjacent positioning and clamping carriers is 15°.

[0017] By adopting the above technical solution, the special fixtures on the test turntable are precisely positioned and evenly distributed, ensuring that each rotation can accurately switch to the next radiation dosimeter to be tested, thereby greatly improving the efficiency and accuracy of the calibration.

[0018] Optionally, the lifting member includes a cylinder mounted on a rotating disk bracket, an output end of the cylinder is connected to a radiation source, a perforation hole is provided on the test turntable, and a diameter of the radiation source is smaller than a diameter of the perforation hole.

[0019] By adopting the above technical solution, the cylinder extends the rod to push the radiation source up. The radiation source can be a radioactive isotope source, such as cesium-137 or cobalt-60, or an X-ray or gamma-ray source. The radiation intensity of the radiation source matches the use range to be tested. When it is not being detected, the radiation source is automatically retracted.

[0020] Optionally, the transmission member includes a rotating motor mounted on a rotating disk bracket, a reducer is provided on the output end of the rotating motor, a worm is mounted on the output end of the reducer, a worm wheel is engaged with the worm, and the worm wheel is connected to the test turntable.

[0021] By adopting the above technical solution, the rotating motor drives the reducer, which drives the worm gear, further drives the meshing worm wheel and the test turntable to rotate, and the test turntable is driven by the worm gear to rotate, so that the radiometer on each special fixture is accurately aligned, which improves the overall transmission smoothness, avoids the possible position deviation during the calibration process, and ensures the automation and reliability of the entire calibration process.

[0022] Optionally, a touch screen for controlling the rotation of the robot system is installed on the support base.

[0023] By adopting the above technical solution, the control of the robot system is facilitated, and the operator can intuitively and quickly adjust the rotation angle and motion parameters of the six-axis robot, thereby improving the operational flexibility and work efficiency of the equipment.

[0024] Optionally, the special clamp and the placement slot are tightened by a movable spring clamping mechanism.

[0025] By adopting the above technical solution, the movable spring clamping mechanism improves the stability of the placement of the special fixture and the fixture tray.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By using a six-axis robot, a test turntable module, and a positioning vehicle module to work together, batch automatic calibration of personal dosimeters is achieved, significantly improving calibration efficiency and reducing the time cost of manual operation; 2. The test turntable module, combined with the lifting parts and annular cover design, can effectively shield the radiation source, preventing calibrators from direct contact with the radiation source, reducing health risks for workers; 3. The system eliminates the possibility of manual adjustment of radiation dose or tampering of data by precisely controlling the rotation angle and automating data collection, ensuring the fairness and accuracy of the calibration results. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0028] Figure 1 This is a schematic diagram showing the overall structure of this application.

[0029] Figure 2 This is a structural diagram of this application showing another perspective.

[0030] Figure 3 This application displays Figure 2 A-direction enlarged view.

[0031] Figure 4 This is a schematic diagram of the test turntable module structure shown in this application.

[0032] Figure 5 This is a schematic diagram of the positioning vehicle module structure shown in this application.

[0033] Figure 6 This is a cross-sectional view of the test turntable module shown in this application.

[0034] Figure numerals: 1. bracket base; 2. test turntable module; 3. robot system; 4. positioning carrier module; 21. rotating disk bracket; 22. lifting member; 23. radiation source; 24. test turntable; 25. transmission member; 26. annular cover; 41. base; 42. fixture tray; 43. special fixture; 31. six-axis robot; 32. vision component; 33. clamping component; 34. infrared measuring instrument; 5. limit block; 6. handle; 7. EPD infrared communicator; 8. wireless communicator; 9. positioning and clamping carrier; 221. cylinder; 222. perforation hole; 10. touch screen; 251. rotating motor; 252. reducer; 253. worm; 254. worm gear. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1 -Attached Figure 6 This application is described in further detail.

[0036] Example 1 The embodiment of the present application provides an automatic calibration device for a nuclear power plant radiation meter, see Figure 1As shown, the system comprises a support base 1, a test turntable module 2 mounted on the support base 1, a robot system 3 mounted adjacent to the test turntable module 2, and positioning carrier modules 4 located on both sides of the robot system 3. A touch screen 10 for controlling the rotation of the robot system 3 is provided on the support base 1 on the side close to the robot system 3, allowing the operator to adjust the rotation direction, angle, and motion parameters of the robot system 3 in a timely manner. Among them, see Figure 4 and Figure 6 As shown, the test turntable module 2 includes a rotating disk bracket 21, a lifting member 22, a radiation source 23 and a test turntable 24 rotatably arranged on the rotating disk bracket 21. The rotating disk bracket 21 adopts an open and detachable bracket to reduce the movement of the existing radiation source 23 during the assembly process; the radiation source 23 is a radioactive isotope source, such as cesium-137 or cobalt-60, or it can be an X-ray or gamma-ray source, and the radiation intensity of the radiation source 23 matches the use range to be tested; a transmission member 25 is provided on the rotating disk bracket 21 to drive the test turntable 24 to rotate, and an annular cover 26 is provided on the lifting member 22 for shielding the radiation from the radiation source 23. The shielding material used in the annular cover 26 protects the operator from radiation damage.

[0037] For details, see Figure 6 As shown, the test turntable module 2 consists of a rotating disk bracket 21, a lifting member 22, a radiation source 23, and a test turntable 24. The rotating disk bracket 21 can be made of high-strength steel and is square or round in shape, providing sufficient rigidity and stability. The lifting member 22 can be a pneumatic cylinder 221 or a hydraulic cylinder, which is used to drive the radiation source 23 up and down, thereby opening and closing the radiation source 23. The test turntable 24 also has a perforation hole 222 with a diameter larger than the diameter of the radiation source 23. The radiation source 23 can be a high-precision radioactive material block with fixed radiation intensity and stability. The test turntable 24 adopts a disc-shaped design with a diameter of 1.5 meters and can simultaneously accommodate 24 special fixtures 43, with the angle between each special fixture 43 being 15°.

[0038] See also Figure 4 and Figure 6 As shown, the test turntable 24 is driven by a transmission member 25. The transmission member 25 can adopt a rotating motor 251 in conjunction with a reducer 252, a worm 253 and a worm wheel 254 structure. The output end of the rotating motor 251 is connected to the reducer 252, and the output end of the reducer 252 is connected to the worm 253. The worm wheel 254 engaged with the worm 253 is driven together, thereby driving the worm wheel 254 and the test turntable 24 to rotate, realizing precise rotation control, so that the radiometer on each special fixture 43 is accurately aligned, avoiding position deviation during the calibration process, and ensuring the automation and reliability of the entire calibration process.

[0039] See also Figure 5As shown, the positioning carrier module 4 consists of a base 41, a fixture tray 42, a carrier holder and a special fixture 43. The fixture tray 42 is installed on the base 41. A plurality of waist-shaped placement slots are opened in a rectangular array on the fixture tray 42. The special fixture 43 is used to place the radiometer. A special fixture 43 and a radiometer are placed in each placement slot. The base 41 can be made of steel and has sufficient strength and stability; the fixture tray 42 adopts a rectangular design with a size of 1.5 meters × 1 meter and can accommodate 24 special fixtures 43; the fixture tray 42 is detachably placed on the base 41, which is convenient for replacing the special fixture 43; the special fixture 43 is designed according to the external dimensions of the two products EPD and DMC3000, and the internal dimensions vary according to the products. It not only protects the products but also allows the two products to share a set of carriers, reducing the cost of the carrier. The carrier positioning adopts a movable spring clamping mechanism (not shown in the drawings), and each product is clamped stably without blocking communication.

[0040] See also Figure 2 and Figure 3 As shown, the robotic system 3 comprises a six-axis robot 31, a vision component 32, and a gripping component 33. The six-axis robot 31 is rotatably mounted on a support base 1, with a robot cabinet securing and adjusting the height of the six-axis robot 31. The six-axis robot 31 is a Luoshi ER7 flexible robot with a 7 kg payload and an 850 mm arm span. Its main body is equipped with machine vision and infrared sensors, replacing existing manual operations. It is primarily used for tasks such as placing and retrieving personal dosimeters and reading data. The robotic arm also incorporates a built-in force control sensor to maximize equipment and personnel safety. The vision component 32 includes a visual camera and a visual light source for infrared readings of the EPD. The gripping component 33 includes an electric gripper for gripping a specialized fixture 43. The six-axis robot 31's arm is equipped with an infrared measuring instrument 34 for real-time distance measurement, preventing collision risks and improving operational safety and reliability. It is also equipped with an EPD infrared communicator 7. A wireless communicator 8 is located on the rotating disk support 21.

[0041] The hardware system also includes a control system, a material system, and a software system. The control system includes a touch screen 10 for controlling the movements of the robot system 3. The material system includes a manual pallet loading device and a robot for pallet loading. The software system includes an automatic test call main program, a low-level test function sequence, and low-level drive control function modules (such as the machine vision OCR recognition function module and infrared control unit). The air pressure requirement is 0.55-0.8 MPa to ensure the normal operation of all components.

[0042] The implementation principle of the automatic calibration device for a nuclear power plant radiation meter in the embodiment of the present application is as follows: The radiometers are manually placed neatly on the fixture tray 42 in sequence. The cylinder 221 drives the jacking radiation source 23 to pass through the penetration hole 222. The radiation source 23 releases radiation to the positioning clamping carrier 9 on the test turntable 24. After the calibration is completed, it automatically retracts into the annular cover 26 to reduce radiation to the human body. The touch screen 10 and the central control system computer are used to operate the six-axis robot 31 according to the program path. The clamping component 33 clamps the radiometer and the special clamp 43 on the fixture tray 42 and places them on the positioning clamping carrier 9. The six-axis robot 31 mechanical arm rotates to clamp the next radiometer, and the synchronous test turntable 24 will rotate 15 degrees to facilitate the placement of the next radiometer on the positioning clamping carrier 9 in the space. On, thereby ensuring the precise placement of the next radiometer, each radiometer on the fixture tray 42 is placed on the test disk, the central control system controls the radiometer to start up, and the EPD infrared communicator 7 on the robotic arm of the six-axis robot 31 automatically reads the radiometer on the test turntable 24 and synchronously displays the test data, and stores it in the database, automatically generates a certificate and original record, and then the test turntable 24 automatically resets, the six-axis robot 31 automatically returns the radiometer, and places each radiometer on the fixture tray 42, meeting the "intelligent, unmanned, batch", efficient and safe regulations, and achieving a method that can realize fully automatic calibration, avoid human cheating, improve calibration efficiency, and reduce personnel radiation exposure.

[0043] Example 2 The difference between this embodiment and the above embodiment lies in that: the performance of the equipment is further improved, and functional modules in other aspects are set; for example, a limit block 5 is added to the base 41, and the limit block 5 and the side of the fixture tray 42 are abutted against each other to ensure the correct placement of the fixture tray 42; a handle 6 for extraction is fixed on the fixture tray 42 to facilitate the operator's transportation; an EPD infrared communicator 7 is set on the robotic arm of the six-axis robot 31 for reading the infrared data of the EPD; a wireless communicator 8 is set on the rotating disk bracket 21 for reading the wireless data of the DMC3000, and the two communicators are used to determine whether the workpiece is on the test turntable 24, which has a certain judgment function; a touch screen 10 for controlling the rotation of the robot system 3 is installed on the bracket base 1 to facilitate the operator to set and monitor parameters.

[0044] In addition, the specific process steps of automated calibration are as follows: S1, manually install the radiometer EOD-G into the special fixture 43, and then put the radiometer EOD-G installed in the special fixture 43 into the fixture tray 42 in sequence; S2, place the fixture tray 42 on the six-axis robot 31 cabinet and use the visual component 32 on the mechanical wall to accurately position it; S3, the six-axis robot 31 moves the radiometer EOD-G and the special fixture 43 to the test turntable 24, and the test turntable 24 rotates to receive the materials; S4, after the calibration test is completed, the robot takes out the product and places it in the fixture tray 42; S5, manually taking away the fixture tray 42.

[0045] The implementation principle of the automatic calibration device for a nuclear power plant radiation meter in the embodiment of the present application is as follows: by adding functional modules such as a limit block 5, a handle 6, an EPD infrared communicator 7, a wireless communicator 8, and a touch screen 10, the automation level and operational convenience of the device are further improved, making the placement of the fixture tray 42 more accurate and convenient, reducing the workload of the operator. The addition of the EPD infrared communicator 7 and the wireless communicator 8 enables the device to handle two different types of personal dosimeters simultaneously, improving the device's compatibility and scope of application. The introduction of the touch screen 10 allows the operator to more intuitively set and monitor parameters, improving the device's operational efficiency and user experience.

[0046] Unless otherwise defined, the technical or scientific terms used in this application shall have the usual meanings understood by persons of ordinary skill in the field to which this application belongs. The words "first", "second", "third" and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprises" cover the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0047] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An automatic calibration device for a nuclear power plant radiation meter, characterized by: It comprises a support base (1), a test turntable module (2) mounted on the support base (1), a robot system (3) mounted adjacent to one side of the test turntable module (2), and positioning carrier modules (4) located on both sides of the robot system (3); The test turntable module (2) comprises a rotating disk bracket (21) mounted on a bracket base (1), a lifting member (22) mounted on the rotating disk bracket (21), a radiation source (23) mounted on the lifting member (22), and a test turntable (24) rotatably arranged on the rotating disk bracket (21); a transmission member (25) for driving the test turntable (24) to rotate is provided on the rotating disk bracket (21); and an annular cover (26) for shielding radiation from the radiation source (23) is provided on the lifting member (22).

2. The automatic calibration device for a nuclear power plant radiation meter according to claim 1, characterized in that: The positioning carrier module (4) comprises a base (41) mounted on the bracket base (1), a fixture tray (42) mounted on the base (41), and a special fixture (43) mounted on the fixture tray (42); the special fixture (43) is arranged in a placement slot provided in a rectangular array on the fixture tray (42).

3. The automatic calibration device for a nuclear power plant radiation meter according to claim 1, characterized in that: The robot system (3) comprises a six-axis robot (31) rotatably arranged on a support base (1), a vision component (32) mounted on a mechanical arm of the six-axis robot (31), and a gripping component (33) arranged on an end effector of the six-axis robot (31); an infrared measuring instrument (34) for measuring distance is arranged on the mechanical arm of the six-axis robot (31).

4. The automatic calibration device for a nuclear power plant radiation meter according to claim 2, characterized in that: A limit block (5) is also provided on the base (41), and the limit block (5) abuts against the side of the jig tray (42), and a handle (6) for extraction is fixed on the jig tray (42).

5. The automatic calibration device for a nuclear power plant radiation meter according to claim 3, characterized in that: An EPD infrared communicator (7) is provided on the mechanical arm of the six-axis robot (31), and a wireless communicator (8) is provided on the rotating disk bracket (21).

6. The automatic calibration device for a nuclear power plant radiation meter according to claim 1, characterized in that: Positioning and clamping carriers (9) for placing special fixtures (43) are distributed on the circumference of the test turntable (24), and the angle between adjacent positioning and clamping carriers (9) is 15°.

7. The automatic calibration device for a nuclear power plant radiation meter according to claim 1, characterized in that: The lifting member (22) comprises a cylinder (221) mounted on a rotating disk bracket (21); an output end of the cylinder (221) is connected to a radiation source (23); a perforation hole (222) is provided on the test turntable (24); and the diameter of the radiation source (23) is smaller than the diameter of the perforation hole (222).

8. The automatic calibration device for a nuclear power plant radiation meter according to claim 1, characterized in that: The transmission member (25) comprises a rotating motor (251) mounted on a rotating disk bracket (21); a reducer (252) is provided on the output end of the rotating motor (251); a worm (253) is mounted on the output end of the reducer (252); a worm wheel (254) is engaged with the worm wheel (253); and the worm wheel (254) is connected to the test rotating disk (24).

9. The automatic calibration device for a nuclear power plant radiation meter according to claim 1, characterized in that: A touch screen (10) for controlling the rotation of the robot system (3) is installed on the support base (1).

10. The automatic calibration device for a nuclear power plant radiation meter according to claim 2, characterized in that: The special clamp (43) and the placement slot are pressed against each other via a movable spring clamping mechanism.

Images