A nuclear power plant radiation dosimeter automatic calibration device

Abstract

The application discloses a kind of nuclear power plant radiation dosimeter automatic calibration equipment, it is related to nuclear power plant radiation dosimeter automatic calibration equipment technical field, it includes support base, test turntable module being installed on support base, robot system being installed adjacent in test turntable module side and the positioning carrier module being located in robot system two sides;Wherein, the test turntable module includes rotating disc support being installed on support base, lifting piece being installed on rotating disc support, radiation source being installed on lifting piece and test turntable being rotationally arranged on rotating disc support, rotating disc support is provided with transmission part for driving test turntable to rotate, and annular casing for shielding radiation source radiation is provided on lifting piece.The application has the effect of improving calibration efficiency and precision, enhancing operation safety, while reducing manual intervention.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic calibration of radiation dose, in particular to a nuclear power plant radiation metrology instrument automatic calibration device. BACKGROUND

[0002] In the nuclear industry field, the calibration of personal dosimeters is an important link to protect the health and safety of workers. With the development of nuclear energy technology, nuclear power plant workers need to frequently enter the radiation control area for work, so higher requirements are put forward for the accuracy and reliability of personal dosimeters. As a key device for monitoring the radiation level of the workplace where workers are located, the calibration process of the personal dosimeter directly affects the safety protection effect of the workers. In order to ensure the calibration accuracy of the personal dosimeter, each nuclear power plant generally establishes a special metrology laboratory for periodic calibration of these devices and issues calibration certificates.

[0003] At present, the calibration of personal dosimeters mainly relies on manual operation, and the specific means include but are not limited to: placing the personal dosimeters to be calibrated one by one in a fixed test position, adjusting the state of the radiation source manually to complete the detection of the radiation amount, then reading the data of the dosimeter by means of a camera or a physical interface, finally recording and generating a calibration certificate, and there are methods of manually switching different radiation intensities to verify the response range of the dosimeter, and schemes of using a specific wavelength light source to simulate a radiation environment to test the sensitivity of the dosimeter.

[0004] However, the above-mentioned traditional manual calibration method has obvious defects. On the one hand, due to the influence of human factors, cheating behaviors may occur in the calibration process, such as arbitrarily adjusting the radiation amount or tampering with the test data, thereby affecting the fairness and accuracy of the calibration results. On the other hand, only a single dosimeter can be processed at a time, which is low in efficiency and time-consuming, and the workers need to directly contact the radiation source during the calibration process, which increases the potential health risk. SUMMARY

[0005] In order to improve the calibration operation in the prior art which relies on manual operation and has the problems of low efficiency, easy cheating and high radiation exposure risk, the present application provides a nuclear power plant radiation metrology instrument automatic calibration device.

[0006] The nuclear power plant radiation metrology instrument automatic calibration device provided by the present application adopts the following technical scheme:

[0007] The utility model provides an automatic calibration equipment of nuclear power plant radiation dosimeter, including support base, test turntable module installed on support base, robot system adjacent installation in test turntable module one side and positioning carrier module in robot system both sides, wherein, test turntable module includes rotary disc support installed on support base, lifting piece installed on rotary disc support, radiation source installed on lifting piece and test turntable rotation arrangement on rotary disc support, rotary disc support is provided with transmission part for driving test turntable rotation, and lifting piece is provided with annular cover for shielding radiation source radiation.

[0008] Through the above technical scheme, the automatic calibration of the nuclear power plant radiation dosimeter is realized, which improves the calibration efficiency. Through the cooperative 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. On the other hand, the safety is improved. The radiation source is lifted in order when in use, and the shielding material on the annular cover effectively shields the radiation source when not in use, reducing the contact between the operator and the radioactive material and ensuring the health of the staff. Furthermore, the calibration accuracy is enhanced. Through precise control of the test turntable rotation and stable radiation source position, accurate radiation dose data is obtained for each dosimeter during calibration.

[0009] Optionally, the positioning carrier module includes a base mounted on the support base, a jig tray mounted on the base, and a special clamp mounted on the jig tray, the special clamp being arranged in a rectangular array of placement slots on the jig tray.

[0010] Through the above technical scheme, through the combination of the base, the jig tray and the special clamp, the personal dose radiation meter to be calibrated can be stably placed and accurately identified, avoiding positioning errors during manual operation, improving the calibration accuracy and consistency. The special clamp on the jig tray is suitable for different models of personal dose radiation meters, simplifying the operation process, reducing the cost of the carrier, protecting the surface of the product, ensuring that the communication is not blocked, and further realizing batch automatic calibration in combination with other modules, improving the calibration efficiency, reducing manual intervention, and reducing the risk of contact between the calibration personnel and the radioactive source.

[0011] Optionally, the robot system includes a six-axis robot rotationally arranged on the support base, a vision component mounted on the mechanical arm of the six-axis robot, and a clamping component arranged on the end effector of the six-axis robot, the mechanical arm of the six-axis robot being provided with an infrared measuring instrument for distance measurement.

[0012] By adopting the technical scheme, the six-axis robot realizes automatic taking and placing operation of the personal dose radiation meter, the visual component on the mechanical wall can accurately position the target position, ensures that the clamping component can accurately grasp the radiation meter on the special fixture, meanwhile, the infrared measuring instrument arranged on the mechanical wall can realize real-time distance measurement, avoids collision risk, improves the safety and reliability of operation, thereby effectively improves the calibration efficiency and reduces manual intervention in operation.

[0013] Optionally, a limiting block is further arranged on the base, the limiting block abuts against the side edge of the jig tray, and a handle for extraction is fixed on the jig tray.

[0014] By adopting the technical scheme, the limiting block is arranged around the jig tray, which is used for accurate positioning of the jig tray, ensures that the jig tray is placed on the base without deviation, thereby improving the accuracy of subsequent mechanical arm operation, and after the calibration operation is completed, the jig tray is also convenient for manual extraction, thereby improving the convenience and efficiency of the overall operation.

[0015] Optionally, an EPD infrared communicator is arranged on the mechanical arm of the six-axis robot, and a wireless communicator is arranged on the rotating disc support.

[0016] By adopting the technical scheme, the EPD infrared communicator on the mechanical wall of the six-axis robot accurately reads the data on the personal dose radiation meter, avoids errors that may be generated by manual reading, improves the accuracy of data acquisition, the wireless communicator on the rotating support disc improves the degree of automation of the calibration system, reduces manual operation process, effectively prevents cheating behavior, effectively avoids direct contact between the calibration personnel and the radioactive source, ensures the safety of the staff, and greatly improves the calibration efficiency, thereby meeting the batch calibration demand.

[0017] Optionally, the test turntable is circumferentially distributed with positioning and clamping carriers for placing special fixtures, and the angle between adjacent positioning and clamping carriers is 15°.

[0018] By adopting the technical scheme, the special fixture on the test turntable is accurately positioned and uniformly distributed, which ensures that each rotation can accurately switch to the next radiation dose meter to be measured, thereby greatly improving the efficiency and precision of calibration.

[0019] Optionally, the lifting member includes a cylinder mounted on the rotating disc support, an output end of the cylinder is connected with the radiation source, a through hole is formed in the test turntable, and the caliber of the radiation source is smaller than the diameter of the through hole.

[0020] By adopting the above technical solution, the cylinder extends a rod to push the radiation source up. The radiation source is a radioactive isotope source, such as cesium-137 or cobalt-60, or it can be an X-ray or gamma-ray source. The radiation intensity of the radiation source is matched with the range of use to be tested. When not under testing, the radiation source is automatically retracted.

[0021] Optionally, the transmission component includes a rotary motor mounted on a rotating disk support, a reducer provided at the output end of the rotary motor, a worm gear mounted at the output end of the reducer, a worm wheel meshing on the worm gear, and the worm wheel connected to the test turntable.

[0022] By adopting the above technical solution, the rotary motor drives the reducer, which in turn drives the worm gear, which in turn drives the meshing worm wheel and the test turntable to rotate. The worm wheel and worm gear drive the test turntable to rotate, which ensures that the radiometers on each special fixture are accurately aligned, improves the overall transmission stability, avoids possible positional deviations during the calibration process, and ensures the automation and reliability of the entire calibration process.

[0023] Optionally, a touchscreen for controlling the rotation of the robot system is mounted on the support base.

[0024] By adopting the above technical solutions, it is easier to control the robot system. Operators 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.

[0025] Optionally, the special clamp and the placement slot are abutted together by a movable spring clamping mechanism.

[0026] By adopting the above technical solution, the stability of the special fixture and jig tray placement is improved by the movable spring clamping mechanism.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By employing a six-axis robot, a test turntable module, and a positioning carrier module working in concert, batch automated calibration of personal dosimeters was achieved, significantly improving calibration efficiency and reducing the time cost of manual operation;

[0029] 2. The test turntable module, together with the lifting components and the ring-shaped cover design, can effectively shield the radiation source, avoid direct contact between calibration personnel and the radiation source, and reduce the health risks to the staff.

[0030] 3. By precisely controlling the rotation angle and using automated data acquisition methods, the system eliminates the possibility of human adjustment of radiation levels or data tampering, ensuring the impartiality and accuracy of calibration results. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the overall structure shown in this application.

[0033] Figure 2 This is a structural schematic diagram illustrating another perspective from which this application is viewed.

[0034] Figure 3 This application demonstrates Figure 2 A magnified view from direction A.

[0035] Figure 4 This application presents a schematic diagram of the test turntable module structure.

[0036] Figure 5 This application presents a schematic diagram of the positioning vehicle module structure.

[0037] Figure 6 This is a cross-sectional view of the test turntable module shown in this application.

[0038] Reference numerals: 1. Support base; 2. Test turntable module; 3. Robot system; 4. Positioning carrier module; 21. Rotary disk support; 22. Lifting component; 23. Radiation source; 24. Test turntable; 25. Transmission component; 26. Annular cover; 41. Base; 42. Fixture tray; 43. Special fixture; 31. Six-axis robot; 32. Vision component; 33. Gripping 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. Through-hole; 10. Touch screen; 251. Rotary motor; 252. Reducer; 253. Worm gear; 254. Worm wheel. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1 -Appendix Figure 6 This application will be described in further detail.

[0040] Example 1

[0041] This application provides an automatic calibration device for a radiation meter in a nuclear power plant, see [link to relevant documentation]. Figure 1As shown, the system includes 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. A touch screen 10 for controlling the rotation of the robot system 3 is provided on the side of the support base 1 near the robot system 3, which allows the operator to adjust the rotation direction, angle, and motion parameters of the robot system 3 in a timely manner.

[0042] Among them, see Figure 4 and Figure 6 As shown, the test turntable module 2 includes a turntable support 21, a lifting component 22, a radiation source 23, and a test turntable 24 rotatably arranged on the turntable support 21. The turntable support 21 adopts an open and detachable support to reduce the movement of the existing radiation source 23 during assembly. 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. The radiation intensity of the radiation source 23 is matched with the range of use to be tested. A transmission component 25 is provided on the turntable support 21 to drive the test turntable 24 to rotate. An annular cover 26 is provided on the lifting component 22 to shield the radiation from the radiation source 23. The shielding material used in the annular cover 26 protects the operator from radiation damage.

[0043] For details, see Figure 6 As shown, the test turntable module 2 consists of a rotating disc support 21, a lifting component 22, a radiation source 23, and a test turntable 24. The rotating disc support 21 can be made of high-strength steel, and is square or round in shape, possessing sufficient rigidity and stability. The lifting component 22 can be a cylinder 221 or a hydraulic cylinder, used to drive the radiation source 23 to move up and down, thereby realizing the opening and closing of the radiation source 23. The test turntable 24 also has a through-hole 222 with a diameter larger than that 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 hold 24 special clamps 43, with an angle of 15° between each special clamp 43.

[0044] See Figure 4 and Figure 6 As shown, the test turntable 24 is driven by a transmission component 25. The transmission component 25 can be a structure consisting of a rotary motor 251, a reducer 252, a worm gear 253, and a worm wheel 254. The output end of the rotary motor 251 is connected to the reducer 252, and the output end of the reducer 252 is connected to the worm gear 253. The worm wheel 254, which meshes on the worm gear 253, is also driven, thereby driving the worm wheel 254 and the test turntable 24 to rotate. This achieves precise rotation control, ensuring that the radiometers on each special fixture 43 are accurately aligned, avoiding positional deviations during calibration, and guaranteeing the automation and reliability of the entire calibration process.

[0045] SeeFigure 5 As shown, the positioning carrier module 4 consists of a base 41, a jig tray 42, a carrier holder, and a special clamp 43. The jig tray 42 is mounted on the base 41. The jig tray 42 has multiple waist-shaped placement slots arranged in a rectangular array. The special clamp 43 is used to place the radiometer. Each placement slot contains a special clamp 43 and a radiometer. The base 41 can be made of steel, which has sufficient strength and stability. The jig tray 42 adopts a rectangular design with dimensions of 1.5 meters × 1 meter, which can accommodate 24 special clamps 43. The jig tray 42 is detachable and placed on the base 41 for easy replacement of the special clamps 43. The special clamp 43 is designed according to the external dimensions of the EPD and DMC3000 products. The internal dimensions differ according to the products, which protects the products and allows the two products to share a single carrier, reducing the carrier cost. The carrier positioning adopts a movable spring clamping mechanism (not shown in the attached figure), which clamps each product stably without obstructing communication.

[0046] See Figure 2 and Figure 3 As shown, the robot system 3 includes a six-axis robot 31, a vision component 32, and a gripping component 33. The six-axis robot 31 is rotatably mounted on the support base 1, and its height is fixed and adapted via a robot cabinet. The six-axis robot 31 uses the Rokae ER7 flexible robot, with a load capacity of 7 kg and an arm span of 850 mm. The robot body is equipped with machine vision and infrared sensors, replacing existing manual operation. It is mainly used to perform actions such as picking up and placing personal dosimeters and reading data. At the same time, the robotic arm itself has a force control sensor, which can maximize the safety of equipment and personnel. The vision component 32 includes a vision camera and a vision light source for infrared readings of the EPD. The gripping component 33 includes an electric gripper for gripping a special clamp 43. The robotic arm of the six-axis robot 31 is equipped with an infrared measuring instrument 34 for distance measurement, which can measure distance in real time to avoid the risk of collision and improve the safety and reliability of operation. It is also equipped with an EPD infrared communicator 7; a wireless communicator 8 is installed on the rotating disk support 21.

[0047] In addition, 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 for the robot to pick up and load pallets; 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 a machine vision OCR recognition function module and an infrared control unit); the air pressure requirement is 0.55~0.8Mpa to ensure the normal operation of all components.

[0048] The implementation principle of an automatic calibration device for a radiation meter in a nuclear power plant according to an embodiment of this application is as follows:

[0049] Radiometers are manually and neatly placed on fixture tray 42. Cylinder 221 drives the lifting of radiation source 23 through the penetration hole 222. Radiation source 23 releases radiation into the positioning and clamping carrier 9 on the test turntable 24. After calibration, it automatically retracts into the annular cover 26 to reduce radiation to the human body. Using touch screen 10 and central control system computer, six-axis robot 31 runs according to the programmed path. The gripping component 33 grips the radiometers and special fixtures 43 on fixture tray 42 and places them on the positioning and clamping carrier 9. The robotic arm of six-axis robot 31 rotates to grip the next radiometer. Simultaneously, the test turntable 24 rotates 15 degrees to facilitate the placement of the next radiometer in the positioning and clamping carrier 9. The process ensures the precise placement of the next radiometer. Each radiometer is placed on the test tray on the fixture tray 42. The central control system controls the radiometer to start up, and the EPD infrared communicator 7 on the six-axis robot 31 automatically reads and displays the test data of the radiometers on the test turntable 24, storing it in the database and automatically generating certificates and original records. Subsequently, the test turntable 24 is automatically reset, and the six-axis robot 31 automatically returns the radiometers to the fixture tray 42, meeting the requirements of "intelligent, unmanned, and batch processing," high efficiency, and safety. This achieves the effect of fully automatic calibration, avoiding human cheating, improving calibration efficiency, and reducing personnel radiation exposure.

[0050] Example 2

[0051] The difference between this embodiment and the above embodiments is that: the performance of the equipment is further improved by setting other functional modules; for example, a limiting block 5 is added to the base 41, and the limiting block 5 abuts against the side of the fixture tray 42 to ensure the correct placement of the fixture tray 42; a handle 6 for extraction is fixed on the fixture tray 42 for easy handling by the operator; 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 rotary table 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 for convenient parameter setting and monitoring by the operator.

[0052] In addition, the specific steps of automated calibration are as follows:

[0053] S1, manually load the radiometer EOD-G into the special fixture 43, and then place the radiometer EOD-G loaded with the special fixture 43 into the fixture tray 42 in sequence;

[0054] S2, place the fixture tray 42 onto the cabinet of the six-axis robot 31, and use the vision component 32 on the mechanical wall for precise positioning;

[0055] S3, the six-axis robot 31 transports the radiometer EOD-G and the special fixture 43 to the test turntable 24, and the test turntable 24 rotates to receive the materials;

[0056] S4, After the calibration test is completed, the robotic arm removes the product and places it into the fixture tray 42;

[0057] S5, manually remove fixture tray 42.

[0058] The implementation principle of an automatic calibration device for radiation dosimeters in nuclear power plants according to an embodiment of this application is as follows: By adding functional modules such as limit blocks 5, handles 6, EPD infrared communicators 7, wireless communicators 8, and touch screens 10, the automation level and ease of operation of the device are further improved. This makes the placement of the fixture tray 42 more accurate and convenient, reducing the workload of operators. The addition of EPD infrared communicators 7 and wireless communicators 8 enables the device to handle two different types of personal dosimeters simultaneously, improving the device's compatibility and applicability. The introduction of touch screens 10 allows operators to set and monitor parameters more intuitively, improving the device's operating efficiency and user experience.

[0059] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0060] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An automatic calibration device for radiation meters in nuclear power plants, characterized in that: It includes 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) includes a rotating disk bracket (21) mounted on a support base (1), a lifting component (22) mounted on the rotating disk bracket (21), a radiation source (23) mounted on the lifting component (22), and a test turntable (24) rotatably arranged on the rotating disk bracket (21). The rotating disk bracket (21) is provided with a transmission component (25) for driving the test turntable (24) to rotate, and the lifting component (22) is provided with an annular cover (26) for shielding the radiation from the radiation source (23). The positioning carrier module (4) includes a base (41) mounted on a support base (1), a jig tray (42) mounted on the base (41), and a special clamp (43) mounted on the jig tray (42). The special clamp (43) is arranged in a placement slot opened in a rectangular array on the jig tray (42). The special clamp (43) and the placement slot are pressed together by a movable spring clamping mechanism.

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

3. The automatic calibration equipment for a nuclear power plant radiation meter according to claim 1, characterized in that: The base (41) is also provided with a limiting block (5), which abuts against the side of the fixture tray (42), and the fixture tray (42) is fixed with a handle (6) for extraction.

4. The automatic calibration equipment for a nuclear power plant radiation meter according to claim 2, characterized in that: The six-axis robot (31) is equipped with an EPD infrared communicator (7) on its robotic arm and a wireless communicator (8) on its rotating disk support (21).

5. The automatic calibration equipment for a nuclear power plant radiation meter according to claim 1, characterized in that: The test turntable (24) has positioning clamping carriers (9) arranged circumferentially for placing special fixtures (43), and the angle between adjacent positioning clamping carriers (9) is 15°.

6. The automatic calibration equipment for a nuclear power plant radiation meter according to claim 1, characterized in that: The lifting component (22) includes a cylinder (221) mounted on a rotating disk bracket (21). The output end of the cylinder (221) is connected to a radiation source (23). A penetration hole (222) is provided on the test turntable (24). The diameter of the radiation source (23) is smaller than the diameter of the penetration hole (222).

7. The automatic calibration equipment for a nuclear power plant radiation meter according to claim 1, characterized in that: The transmission component (25) includes a rotary motor (251) mounted on a rotating disk support (21). A reducer (252) is provided on the output end of the rotary motor (251). A worm gear (253) is mounted on the output end of the reducer (252). A worm wheel (254) meshes with the worm gear (253). The worm wheel (254) is connected to the test turntable (24).

8. The automatic calibration equipment for a nuclear power plant radiation meter according to claim 1, characterized in that: The support base (1) is equipped with a touch screen (10) for controlling the rotation of the robot system (3).

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