Vertical testing device for surface contamination detector and testing method thereof

Abstract

The application discloses a vertical testing device and a testing method thereof for a surface contamination detector, the vertical testing device comprises a shielding cabinet, a testing platform, a control console and a camera installed on the testing platform, a detection window is arranged in the middle of the testing platform, and the camera is in communication connection with the control console; a plurality of surface source storage drawers are installed on the shielding cabinet and are arranged in an up-down interval; the testing platform is arranged at the front end of the shielding cabinet and can move up and down along the shielding cabinet or slide and be positioned after sliding under the drive of a platform driving mechanism; a drawer pulling mechanism capable of pulling the surface source storage drawer backward is fixedly installed on the lower end surface of the testing platform; the control console is in communication connection with the platform driving mechanism and the drawer pulling mechanism, is used for setting control parameters of the platform driving mechanism, the drawer pulling mechanism and the camera, extracting real-time detection results after processing the image shot by the camera, and generating a test record.

Description

Technical Field

[0001] This invention relates to the field of verification and calibration of surface contamination detectors, and particularly to a vertical verification device and verification method for verifying surface contamination detectors. Background Technology

[0002] A surface contamination detector is a specialized instrument used to detect the level of radioactive material (mainly alpha and beta rays) contamination on the surface of objects. It is widely used in nuclear industry, medical fields, environmental protection, customs, and other areas. To ensure the accuracy of the detector's results before leaving the factory and after long-term use, the detector is usually calibrated before leaving the factory. During calibration, alpha and beta standard planar sources with different ranges are placed and fixed on the detection platform. The detector's probe is then aligned with the planar source to be detected. The distance between the probe and the planar source is controlled according to the detection requirements. The detector is then turned on for real-time detection, and the readings are recorded. After the readings stabilize, the real-time detection results are compared with the count rate of the planar source to determine if there are any errors in the detector's results.

[0003] Currently, when testing surface contaminants, calibration personnel often need to frequently move and operate the surface contaminant meter, and the readings are directly observed. This results in prolonged contact between the calibration personnel and the a / β source, increasing the long-term radiation safety risk and potentially impacting their physical and mental health. To avoid this problem, an automatic surface contaminant meter calibration device has been developed, comprising a working platform, a planar source support frame, a probe fixing bracket, and a camera. The planar source support frame is located below the working platform, and the working platform has a detection window corresponding to the detector's detection surface. Multiple planar source limiting slots for placing different planar sources are spaced apart on the planar source support frame. The camera corresponds to the display screen of the detector's main unit and is connected to a PLC controller. When calibrating the detector using this structure, the test results can be output to the PLC controller via the camera, eliminating the need for on-site recording by the calibration personnel. Furthermore, by driving the planar source support frame to move horizontally, different planar sources can be matched with the tested detector, enabling the same detector to detect planar sources with different ranges. However, the working platform and planar source support frame of the above-mentioned calibration device are set horizontally, which takes up a large area and is not convenient for widespread promotion. At the same time, each standard planar source in the calibration device is exposed to the outside throughout the process, and the calibration personnel will still be in a radiation environment when changing the detector, which will affect their health. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, the present invention aims to solve the technical problems of existing calibration devices having a large footprint and causing calibration personnel to still be exposed to radiation environments and affect their health when changing detectors during the calibration process. The invention provides a vertical calibration device and method for calibrating surface contamination detectors. The calibration device is vertically arranged, occupies little space, has a simple structure, is easy to operate, and all planar sources are placed within a shielded space, ensuring that calibration personnel are not exposed to radiation when changing detectors.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A vertical calibration device for calibrating surface contamination detectors includes a calibration platform and a control console. A detection window is located in the center of the calibration platform, and a corresponding camera is positioned above the detection window. The camera is communicatively connected to the control console. The device also includes a shielded cabinet with multiple surface source storage drawers spaced vertically on it. These drawers are used to place and secure α-standard surface sources or β-standard surface sources. The calibration platform is positioned at the front of the shielded cabinet and can move vertically or slide along the cabinet and then be positioned under the drive of a platform driving mechanism. A drawer pulling mechanism is fixedly installed on the lower end face of the calibration platform. The drawer pulling mechanism includes a gripping rod that can extend and retract along the thickness of the shielded cabinet and be positioned. A connecting member is provided at the end of the gripping rod. The connecting member allows the gripping rod to extend towards the shielded cabinet. The outer end face of the corresponding surface source storage drawer can be releasably engaged, so that the pulling force of the gripping rod is transmitted in the engaged state to drive the surface source storage drawer to move and position along the thickness direction of the shielding cabinet, so that the α standard surface source or β standard surface source stored in the surface source storage drawer corresponds to the detection window of the calibration platform, and separates from the outer end face of the surface source storage drawer when the surface source storage drawer returns to the initial position and the gripping rod retracts; the control console is communicatively connected to the platform drive mechanism and the drawer pull mechanism, and is used to set the start and stop parameters of the platform drive mechanism, the start and stop parameters of the drawer pull mechanism and the shooting parameters of the camera, and after receiving the image captured by the camera, the image is processed to extract the real-time detection result of the current test instrument to be calibrated, and then the test records measured by each test instrument to be calibrated at each surface source positioning a and surface source positioning area b are generated accordingly.

[0007] Furthermore, a positioning mechanism is provided on the calibration platform and around the detection window. The positioning mechanism includes a miniature telescopic cylinder and a positioning block fixed to the end of the cylinder rod of the miniature telescopic cylinder.

[0008] Furthermore, the miniature telescopic cylinder is communicatively connected to the control console, which can also be used to set the equipment parameters of the instrument to be calibrated and control the extension and retraction of each miniature telescopic cylinder according to the equipment parameters, so as to clamp and fix the instrument to be calibrated.

[0009] Furthermore, the drawer pull-out mechanism also includes a push cylinder, which is fixed under the calibration platform, and the cylinder rod of the push cylinder is fixedly connected to the gripping rod.

[0010] Furthermore, the connecting component is an electromagnet, and a storage battery is fixed under the calibration platform. The storage battery is connected to the electromagnet through a wire to supply power to the electromagnet, so that the electromagnet is magnetically attracted to the front surface of the surface source storage drawer after it approaches the front surface of the surface source storage drawer. The storage battery is communicatively connected to the control console, and the control console sends power supply or power off signals to the storage battery to control the electromagnet to be energized or de-energized.

[0011] Furthermore, the platform driving mechanism consists of two linear sliding guide rail modules symmetrically installed on the left and right sides of the shielded cabinet. Each linear sliding guide rail module includes a base, a driving unit, and a guiding mechanism. The guiding mechanism includes a linear slide rail and a slider. The base is fixed to the shielded cabinet, and the linear slide rail is fixedly installed on the base in a vertical arrangement. One end of the slider is slidably engaged with the linear slide rail, and the other end is fixedly connected to the calibration platform. The slider is also driven by the driving unit and can move up and down along a linear path and be positioned under the drive of the driving unit. The driving unit includes a driving motor and a transmission mechanism connected to the driving motor. The transmission mechanism is driven by the slider.

[0012] Furthermore, the platform drive mechanism can also be multiple lifting mechanisms installed below the calibration platform.

[0013] Furthermore, the back panel of the shielding cabinet can be rotatably mounted on the cabinet body and locked to the cabinet body by a latch.

[0014] A calibration method for a surface contamination detector includes the following steps: S1, placing a vertical calibration device in an irradiation chamber and a control console in a control room. The vertical calibration device, as described above, is communicatively connected to a camera, a platform drive mechanism, and a drawer pull-out mechanism. Corresponding α-standard surface sources and β-standard surface sources are placed in the surface source storage drawers of the shielded cabinet; S2, based on the equipment parameters of the detector to be calibrated and the placement positions of the α-standard surface sources and β-standard surface sources, the control parameters of the platform drive mechanism, drawer pull-out mechanism, positioning mechanism, and camera are input into the control console; S3, the calibration personnel place the detector to be calibrated in the irradiation chamber... After the platform is positioned, return to the control room; S4, the verification personnel start the verification program through the control console. The specific verification steps are as follows: S4.1, first send a positioning command to the positioning mechanism, and each micro cylinder in the positioning mechanism positions the instrument to be verified according to the preset positioning control parameters; S4.2, send a drive command to the platform drive mechanism, and the platform drive mechanism drives the verification platform to the set initial verification position, and then sends a stop command to the platform drive mechanism, and the verification platform is positioned at the initial verification position; S4.3, send a surface source extraction command to the drawer pull-out mechanism, and the drawer pull-out mechanism drives the gripping rod to extend and... After the end connector engages with the surface source storage drawer below the calibration platform, the gripping lever retracts to a set distance and stops retracting. The surface source storage drawer is positioned, and the α or β standard surface source in the drawer corresponds to the detector of the instrument to be calibrated on the calibration platform. The distance between the standard surface source and the instrument to be calibrated is equal to the calibration distance. In step S4.4, simultaneously sending a detection command to the instrument to be calibrated and a camera command to the camera, the instrument to be calibrated detects the current α or β standard surface source. The camera captures the detection result of the instrument to be calibrated in real time and transmits the image to the control console. S4.5 The control console processes the received captured image and extracts the detection readings, storing them in the detection results of the instrument to be calibrated. S4.6 The control console sends a return command to the drawer pulling mechanism, which drives the gripping rod to extend again until the surface source storage drawer returns to its initial position and is positioned. Then, the control console retracts the gripping rod, completing one calibration. S4.7 Steps S4.2-S4.6 are repeated multiple times until all standard surface sources on the shielded cabinet have been calibrated. The control console then generates the test record and certificate electronic version for the instrument to be calibrated and stores the test record.

[0015] Furthermore, a distance measuring sensor is installed on the calibration platform. The distance measuring sensor is communicatively connected to the control console and can detect the real-time height of the calibration platform and transmit the real-time height of the calibration platform to the control console. The control console sends corresponding drive commands to the platform drive mechanism based on the received real-time height of the calibration platform. Attached Figure Description

[0016] To make the objectives, technical solutions, and advantages of the invention clearer, the invention will now be described in further detail with reference to the accompanying drawings, wherein:

[0017] Figure 1 This is a three-dimensional structural diagram of the vertical calibration device in the embodiment;

[0018] Figure 2 This is a schematic diagram of the installation structure of the positioning mechanism and the calibration platform in the embodiment;

[0019] Figure 3 This is a schematic diagram of the installation structure of the drawer pull-out mechanism and the calibration platform in Example 1;

[0020] Figure 4 This is a schematic diagram of the drawer pull-out mechanism and the surface storage drawer in embodiment 2 in engagement state;

[0021] Figure 5 This is a schematic diagram of the structure on the back of the shielding cabinet in the embodiment. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Example 1:

[0026] See Figures 1-3This embodiment provides a vertical calibration device for calibrating a surface contamination detector, including a calibration platform 3 and a control console 7. A detection window 31 is located in the middle of the calibration platform 3, and a corresponding camera 6 is located above the detection window 31. The camera 6 is communicatively connected to the control console 7. It also includes a shielded cabinet 1, on which multiple surface source storage drawers 11 are installed at vertical intervals. The surface source storage drawers 11 are used to place and fix α standard surface sources or β standard surface sources. The calibration platform 3 is located at the front end of the shielded cabinet 1 and can move up and down or slide along the shielded cabinet 1 and then be positioned under the drive of a platform driving mechanism 2. A drawer pulling mechanism 5 is fixedly installed on the lower end face of the calibration platform 3. The drawer pulling mechanism 5 includes a gripping rod 52 that can extend and retract and be positioned in the thickness direction of the shielded cabinet 1. A connecting member 53 is provided at the end of the gripping rod 52. The connecting member 53 can extend and retract along the gripping rod 52... When the shielding cabinet 1 extends in the direction of extension, it can be releasably engaged with the outer end face of the corresponding surface source storage drawer 11. In the engaged state, the pulling force of the gripping rod 52 is transmitted to drive the surface source storage drawer 11 to move and position along the thickness direction of the shielding cabinet 1, so that the α standard surface source or β standard surface source stored in the surface source storage drawer 11 corresponds to the detection window 31 of the calibration platform 3. After the surface source storage drawer 11 returns to the initial position and the gripping rod 52 retracts, it separates from the outer end face of the surface source storage drawer 11. The control console 7 is communicatively connected to the platform drive mechanism 2 and the drawer pull mechanism 5. It is used to set the start and stop parameters of the platform drive mechanism 2, the start and stop parameters of the drawer pull mechanism 5, and the shooting parameters of the camera 6. After receiving the image captured by the camera 6, the console 7 processes the image to extract the real-time detection result of the current test instrument to be calibrated, and then generates the test record measured by each test instrument to be calibrated at each surface source positioning a and surface source positioning area b.

[0027] In this embodiment, the calibration device is vertically arranged. The calibration platform 3 is directly positioned in front of the shielded cabinet 1 containing the α or β standard surface source. The overall structure is compact. By moving the calibration platform 3 up and down, and installing a drawer 11 for pulling out the surface source storage on the lower end face of the calibration platform 3, the instrument to be calibrated can be moved to a designated position in the height direction. Then, the drawer-pulling mechanism 5 pulls out the adjacent surface source storage drawer 11 below the calibration platform 3, so that the α or β standard surface source in the surface source storage drawer 11 corresponds to the instrument to be calibrated. The set distance between the α and β standard surface sources and the detection surface of the instrument to be calibrated meets the calibration standard, achieving the purpose of calibrating standard surface sources with different storage heights. At the same time, the standard surface sources stored in each surface source storage drawer 11 have different ranges. After moving up and down to position and detect, standard surface sources with different ranges can be detected. After all α and β standard surface sources have been detected, all surface source storage drawers 11 are closed, and the shielding cabinet 1 effectively shields the radiation. At this point, when the calibration personnel replace the next detector to be calibrated, they will not be in direct contact with the radiation environment and will not be affected in terms of health. After the control console 7 is connected to the platform drive mechanism 2 and the drawer pulling mechanism 5, it can directly control the lifting and lowering of the calibration platform 3 and the pulling and lowering of the surface source storage drawers 11 from the background, achieving a high degree of automation.

[0028] To ensure that the surface storage drawer 11 does not interfere with the inspection platform 3 during the pulling process, the distance between the pull-out panels of two adjacent surface storage drawers 11 is greater than the thickness of the inspection platform 3.

[0029] Different testing instruments have different sizes and shapes. Therefore, if the same testing platform 3 is to be able to test multiple models of testing instruments, the testing platform 3 needs to be able to position testing instruments of different shapes and sizes. Therefore, a positioning mechanism 4 is provided on the testing platform 3 around the detection window 31, such as... Figure 2 As shown, the positioning mechanism 4 includes a miniature telescopic cylinder 41 and a positioning block 42 fixed to the end of the cylinder rod of the miniature telescopic cylinder 41. The miniature telescopic cylinder 41 is communicatively connected to the control console 7. The control console 7 can also be used to set the equipment parameters of the instrument to be calibrated, and control the extension and retraction of each miniature telescopic cylinder 41 according to the equipment parameters to clamp and fix the instrument to be calibrated.

[0030] Specifically, in this embodiment, the drawer pull-out mechanism 5 further includes a push cylinder 51, which is fixed under the calibration platform 3, and the cylinder rod of the push cylinder 51 is fixedly connected to the gripping rod 52. Of course, in specific implementation, a motor-driven linkage mechanism can be used to drive the gripping rod 52 to reciprocate and position itself.

[0031] like Figure 3As shown, in this embodiment, the connecting member 53 is an electromagnet. A storage battery 54 is fixed under the calibration platform 3. The storage battery 54 is connected to the electromagnet via a wire to supply power to the electromagnet, allowing it to magnetically attach to the surface storage drawer 11 when it approaches the front end of the surface storage drawer 11. The storage battery 54 is communicatively connected to the control console 7, which sends power-on or power-off signals to the battery 54 to control the electromagnet's power supply. When the connecting member 53 is an electromagnet, it can magnetically connect to the front end of the surface storage drawer 11. This connection is stable, and separation is relatively simple, requiring no complex structure. Specifically, when the surface storage drawer 11 needs to be pulled out, the storage battery 54 supplies power to the electromagnet, achieving a magnetic connection. After pulling out the drawer, if separation is required, the storage battery 54 is de-energized, and the electromagnet automatically separates from the surface storage drawer 11. This connection and separation are relatively simple and require no modification to the surface storage drawer 11. Furthermore, there is no need to install handles on each surface storage drawer 11, and there are no protruding obstacles between the inspection platform 3 and the shielding cabinet 1.

[0032] Furthermore, the platform drive mechanism 2 consists of two linear sliding guide rail modules symmetrically installed on the left and right sides of the shielded cabinet 1. Each linear sliding guide rail module includes a base, a drive unit (not shown in the figure), and a guide mechanism. The guide mechanism includes a linear slide rail 21 and a slider 22. The base is fixed on the shielded cabinet 1, and the linear slide rail 21 is fixedly installed on the base in a vertical arrangement. One end of the slider 22 is slidably engaged with the linear slide rail 21, and the other end is fixedly connected to the calibration platform 3. The slider 22 is also connected to the drive unit and can move up and down along a linear path and be positioned under the drive of the drive unit. The drive unit includes a drive motor and a transmission mechanism connected to the drive motor. The transmission unit is connected to the slider 22. In specific implementation, the transmission mechanism of the drive unit can be a synchronous belt drive (such as the synchronous belt linear slide disclosed in Chinese Patent Application No. 2022203787165), or it can be a ball screw (the output end of the drive motor is fixedly connected to the ball screw through a connector, a nut that is threaded with the ball screw is fitted on the ball screw, the slider is fixed on the nut, and the slide rail is provided on both sides of the ball screw to guide the slider).

[0033] The calibration platform 3 is connected to the shielded cabinet 1 via a linear sliding guide module, which facilitates the installation and arrangement of the calibration device and ensures that the calibration platform 3 can move up and down for precise positioning. The linear sliding guide module enables precise control of the sliding distance of the calibration platform 3, and its placement on both sides will not affect the pulling out of the surface source storage drawer 11.

[0034] like Figure 5As shown, to quickly store standard surface sources, in this embodiment, the back panel 12 of the shielding cabinet 1 is rotatably mounted on the cabinet body and locked to the cabinet body by a latch. When placing an α standard surface source or a β standard surface source, the latch is released, the back panel of the shielding cabinet 1 is opened, and each α standard surface source and β standard surface source can be quickly placed into its corresponding surface source storage drawer 11. Specifically, the α standard surface source and the β standard surface source must have at least three ranges of standard surface sources, including low range, medium range, and high range, with different surface emissivity for the three ranges.

[0035] To ensure proper positioning of each surface source and to guarantee that the distance between each standard surface source and the detection surface of the detector under test is within a set value after the surface source storage drawer 11 is pulled out, specifically, after the α standard surface source is placed in surface source positioning area a, the distance between its upper surface and the detection surface of the detector under test is 5mm; and after the β standard surface source is placed in surface source positioning area b, the distance between its upper surface and the detection surface of the detector under test is 10mm. In this embodiment, each surface source storage drawer 11 has a positioning groove on its bottom plate for positioning the standard surface sources. The longitudinal depth of the surface source storage drawer 11 for placing the α standard surface source is different from that for placing the β standard surface source. The depth of the surface source storage drawer 11 is set so that the calibration distance can be met after the standard surface sources are placed. To facilitate the setup of the control console 7, this embodiment has 6 surface source storage drawers 11, with the top three for placing the α standard surface source and the bottom three for placing the β standard surface source. To facilitate placement by calibration personnel, labels can be set on the surface source storage drawer 11 to indicate the placement of the α standard surface source and the β standard surface source.

[0036] Example 2:

[0037] The only difference between this embodiment and Embodiment 1 is the structure of the connecting member 53 and the surface storage drawer 11. Specifically, as shown... Figure 4As shown, the connecting piece 53 is a metal spring sheet fixed to the end of the gripping rod 52. Each drawer 11 has a through hole on its pull-out panel for the connecting piece 53 to pass through. The metal spring sheet is formed by repeatedly bending a single elastic metal sheet, including a horizontal connecting plate 531, a first inclined pressure plate 532, a second inclined pressure plate 533, and a horizontal guide plate 534 connected in sequence. The horizontal connecting plate 531 is fixed to the end of the gripping rod 52 by fasteners, and the end of the horizontal connecting plate 531 away from the shielding cabinet 1 is bent upwards to form a bent portion 535. The first inclined pressure plate 532 and the second inclined plate are hook-shaped, and the first inclined pressure plate 532... 32 is positioned near the side of the shielding cabinet 1, with a gap between the horizontal guide plate 534 and the horizontal connecting plate 531. When the connecting piece 53 extends towards the surface storage drawer 11 under the action of the gripping rod 52, the first inclined pressure plate 532 moves downward under the side pressure of the inner wall of the through hole in the drawer panel until it passes through the first inclined pressure plate 532 and the second inclined pressure plate 533. After passing through the through hole, the second inclined pressure plate 533 abuts against the inner side of the pull-out panel of the surface storage drawer 11 and together with the bent part 535 of the horizontal connecting plate 531, forms a clamping space that locks the pull-out panel, thereby enabling the pull-out of the surface storage drawer 11 during the extension and retraction of the gripping rod 52. After the inspection is completed, when the gripping rod 52 retracts back to its original position, the second inclined pressure plate 533 and the first inclined pressure plate 532 move downward under the pressure of the side wall of the through hole, are placed in the through hole, and pass through the through hole, separating from the surface storage drawer 11. The horizontal guide plate 534 in the metal spring sheet serves to guide the spring sheet during insertion or withdrawal. Specifically, the metal spring sheet can be made of spring steel 65Mn or phosphor bronze C5191.

[0038] Of course, in practice, the drawer 11 can also be pulled out by using a vacuum suction cup to adsorb the pull-out panel of the surface source storage drawer 11.

[0039] Example 3:

[0040] The only difference between this embodiment and Embodiment 1 is the structure of the platform drive mechanism 2. Specifically, in this embodiment, the platform drive mechanism 2 consists of four lifting mechanisms (not shown in the figure) installed below the calibration platform 3. These lifting mechanisms are arranged in a rectangular shape and are either hydraulic jacks (the hydraulic jacks are readily available products) or electric lifting screw mechanisms. By using lifting mechanisms, the calibration platform 3 can be raised and lowered without the need for guide rails on the cabinet.

[0041] Example 4:

[0042] This embodiment provides a calibration method for a surface contamination detector, including the following steps: S1, placing a vertical calibration device in an irradiation chamber and a control console 7 in a control room. The vertical calibration device is as described in Embodiment 1. The control console 7 is communicatively connected to the camera 6, the platform drive mechanism 2, and the drawer pull-out mechanism 5. Corresponding α-standard surface sources and β-standard surface sources are placed in the surface source storage drawers 11 of the shielded cabinet 1; S2, according to the equipment parameters of the detector to be calibrated and the placement positions of the α-standard surface sources and β-standard surface sources, the control parameters of the platform drive mechanism 2, the drawer pull-out mechanism 5, the positioning mechanism 4, and the camera 6 are input into the control console 7; S3, the calibration personnel place the detector to be calibrated... After the testing instrument is placed on the calibration platform 3, it returns to the control room; S4, the calibration personnel start the calibration program through the control console 7. The specific calibration steps are as follows: S4.1, first, a positioning command is sent to the positioning mechanism 4, and each micro cylinder in the positioning mechanism 4 positions the testing instrument to be calibrated according to the preset positioning control parameters; S4.2, a driving command is sent to the platform drive mechanism 2, which drives the calibration platform 3 to the set initial calibration position, and then a stop command is sent to the platform drive mechanism 2, and the calibration platform 3 is positioned at the initial calibration position; S4.3, a surface source extraction command is sent to the drawer pull mechanism 5, which drives the gripping rod 5. 2. After the extended end of the connector 53 connects with the surface source storage drawer 11 below the calibration platform 3, the control gripping rod 52 retracts to a set distance and stops retracting. The surface source storage drawer 11 is positioned, and the α standard surface source or β standard surface source in the surface source storage drawer 11 corresponds to the detector of the test instrument to be calibrated on the calibration platform 3. The distance between the standard surface source and the test instrument to be calibrated is equal to the calibration distance. S4.4. At the same time as sending a detection command to the test instrument to be calibrated, a camera command is sent to the camera 6. At this time, the test instrument to be calibrated detects the current α standard surface source or β standard surface source, and the camera 6 captures the detection result of the test instrument to be calibrated in real time and transmits the image to the control. S4.5, Control console 7 processes the received captured images and extracts the detection readings, storing the detection readings in the detection results of the instrument to be calibrated; S4.6, Control console 7 sends a return command to the drawer pull-out mechanism 5, which drives the gripping rod 52 to extend again until the surface source storage drawer 11 returns to its initial position and is positioned, then controls the gripping rod 52 to retract, completing one calibration; S4.7, Repeat steps S4.2-S4.6 multiple times until all standard surface sources on the shielded cabinet 1 have been calibrated, then Control console 7 generates the test record and certificate electronic version of the instrument to be calibrated, and stores the test record.

[0043] Furthermore, a distance measuring sensor is provided on the calibration platform 3. The distance measuring sensor is communicatively connected to the control console 7 and can detect the real-time height of the calibration platform 3 and transmit the real-time height of the calibration platform 3 to the control console 7. The control console 7 sends a corresponding drive command to the platform drive mechanism 2 based on the received real-time height of the calibration platform 3.

[0044] In practice, a detector storage platform can be placed in the radiation room next to the shielding cabinet 1, and a robot (which is connected to the control console 7) can be set up between the detector storage platform and the shielding cabinet 1. The robot will pick up the detector to be tested from the detector storage platform and place it on the testing platform 3 so that its detection surface corresponds to the detection window 31.

[0045] In this embodiment, the initial testing position of the testing platform 3 is above the top surface source storage drawer 11 of the shielded cabinet 1, or above the bottom surface source storage drawer 11. During testing, the testing platform 3 can be tested sequentially from top to bottom, or sequentially from bottom to top.

[0046] In this embodiment, the following is selected: 241 One Am source, with three surfaces (active area 100×150mm). 36 One Cl source is used, consisting of three surfaces (active area 100×150mm). The relative expanded uncertainty does not exceed 5% (K=2), and the surface emissivity non-uniformity does not exceed 10%. According to the requirements of JJG478-2016 "Verification Procedure for α and β Surface Contamination Instruments", one surface source is selected for each magnitude. The control console 7 uses a highly stable and reliable Advantech IPC-710 industrial computer.

[0047] Each surface source can be numbered from top to bottom, and different types and emissivity surface sources can be placed there. The control console 7 has a built-in data processing module, which is used to set the position number of the standard surface source from position 1 to N, the size of the surface source corresponding to each position number, the type of surface source, the standard threshold of surface source emissivity, the initial position height of the calibration platform, the moving distance of the calibration platform, the extension length of the gripping rod in the drawer pull-out mechanism, and the start and stop time, etc. At the same time, after receiving the image captured by the camera, the data processing module processes the captured image and extracts the corresponding reading. If the reading is within a certain range (the corresponding standard threshold range of surface source emissivity), it is considered as qualified; otherwise, it is considered as unqualified.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A vertical calibration device for calibrating a surface contamination detector, comprising a calibration platform and a control console, wherein a detection window is provided in the middle of the calibration platform, and a corresponding camera is provided above the detection window, the camera being communicatively connected to the control console; characterized in that, It also includes a shielded cabinet with multiple surface source storage drawers spaced vertically on it. These drawers are used to place and secure α-standard surface sources or β-standard surface sources. A calibration platform is positioned at the front of the shielded cabinet and can move up and down or slide along the cabinet and then be positioned under the drive of a platform drive mechanism. A drawer pull-out mechanism is fixedly installed on the lower end face of the calibration platform. This mechanism includes a gripping rod that can extend and retract along the thickness of the shielded cabinet and be positioned. The end of the gripping rod has a connecting member. When the gripping rod extends towards the shielded cabinet, the connecting member can releasably engage with the outer end face of the corresponding surface source storage drawer to transmit the pulling force of the gripping rod in the engaged state. The surface source storage drawer is moved and positioned along the thickness direction of the shielding cabinet, so that the α standard surface source or β standard surface source stored in the surface source storage drawer corresponds to the detection window of the calibration platform. After the surface source storage drawer returns to its initial position and the gripping rod retracts, it separates from the outer end face of the surface source storage drawer. The control console is communicatively connected to the platform drive mechanism and the drawer pull-out mechanism. It is used to set the start and stop parameters of the platform drive mechanism, the start and stop parameters of the drawer pull-out mechanism, and the shooting parameters of the camera. After receiving the image captured by the camera, the console processes the image to extract the real-time detection result of the current test instrument to be calibrated, and then generates the test record measured by each test instrument to be calibrated at each surface source positioning a and surface source positioning area b.

2. The vertical calibration device for calibrating surface contamination detectors according to claim 1, characterized in that, A positioning mechanism is provided on the calibration platform and around the detection window. The positioning mechanism includes a miniature telescopic cylinder and a positioning block fixed to the end of the cylinder rod of the miniature telescopic cylinder.

3. The vertical calibration device for calibrating surface contamination detectors according to claim 2, characterized in that, The miniature telescopic cylinder is connected to the control console. The control console can also be used to set the equipment parameters of the instrument to be calibrated, and control the extension and retraction of each miniature telescopic cylinder according to the equipment parameters, so as to clamp and fix the instrument to be calibrated.

4. The vertical calibration device for calibrating surface contamination detectors according to claim 1, 2, or 3, characterized in that, The drawer pull-out mechanism also includes a push cylinder, which is fixed under the calibration platform, and the cylinder rod of the push cylinder is fixedly connected to the gripping rod.

5. The vertical calibration device for calibrating surface contamination detectors according to claim 4, characterized in that, The connecting component is an electromagnet. A storage battery is fixed under the calibration platform. The storage battery is connected to the electromagnet through a wire to supply power to the electromagnet, so that the electromagnet is magnetically attracted to the front surface of the surface source storage drawer after it approaches the front surface of the surface source storage drawer. The storage battery is communicatively connected to the control console, and the control console sends power supply or power off signals to the storage battery to control the electromagnet to be energized or de-energized.

6. The vertical calibration device for calibrating surface contamination detectors according to claim 4, characterized in that, The platform drive mechanism consists of two linear sliding guide rail modules symmetrically installed on the left and right sides of the shielded cabinet. Each linear sliding guide rail module includes a base, a drive unit, and a guide mechanism. The guide mechanism includes a linear slide rail and a slider. The base is fixed to the shielded cabinet, and the linear slide rail is fixedly installed on the base in a vertical arrangement. One end of the slider is slidably engaged with the linear slide rail, and the other end is fixedly connected to the calibration platform. The slider is also connected to the drive unit and can move up and down along a linear path and be positioned under the drive of the drive unit. The drive unit includes a drive motor and a transmission mechanism connected to the drive motor. The transmission unit is connected to the slider.

7. The vertical calibration device for calibrating surface contamination detectors according to claim 4, characterized in that, The platform drive mechanism can also be multiple lifting mechanisms installed below the calibration platform.

8. The vertical calibration device for calibrating a surface contamination detector according to any one of claims 1, 2, 3, 5, or 6, characterized in that, The back panel of the shielding cabinet is rotatably mounted on the cabinet body and locked to the cabinet body by a latch.

9. A method for calibrating a surface contamination detector, characterized in that, The process includes the following steps: S1, placing the vertical calibration device in an irradiation chamber and the control console in a control room. The vertical calibration device, as described in any one of claims 2-8, is communicatively connected to the camera, platform drive mechanism, and drawer pull-out mechanism. Corresponding α-standard and β-standard surface sources are placed in the surface source storage drawers of the shielded cabinet. S2, based on the equipment parameters of the instrument to be calibrated and the placement positions of the α-standard and β-standard surface sources, the control parameters of the platform drive mechanism, drawer pull-out mechanism, positioning mechanism, and camera are input into the control console. S3, after placing the instrument to be calibrated on the calibration platform, the calibration personnel return to the control room. S4, the calibration personnel start the calibration program through the control console. The specific calibration steps are as follows: S4.1, first, a positioning command is sent to the positioning mechanism... In the positioning mechanism, each micro cylinder positions the instrument to be calibrated according to the preset positioning control parameters; S4.2, a drive command is sent to the platform drive mechanism, which drives the calibration platform to the set initial calibration position, and then a stop command is sent to the platform drive mechanism, and the calibration platform is positioned at the initial calibration position; S4.3, a surface source extraction command is sent to the drawer pull-out mechanism, which drives the gripping rod to extend and the end of the connecting piece to connect with the surface source storage drawer below the calibration platform, and then controls the gripping rod to retract to the set distance and stop retracting, the surface source storage drawer is positioned, and the α standard surface source or β standard surface source in the surface source storage drawer corresponds to the detector of the instrument to be calibrated on the calibration platform, and the distance between the standard surface source and the instrument to be calibrated is equal to the calibration distance; S4.4 At the same time as sending a detection command to the instrument to be calibrated, a camera command is sent to the camera. At this time, the instrument to be calibrated detects the current α standard surface source or β standard surface source, and the camera captures the detection results of the instrument to be calibrated in real time and transmits the image to the control console. S4.5 The control console performs image processing on the received captured images, extracts the detection readings, and stores the detection readings in the detection results of the current detector to be calibrated; S4.6, The control console sends a return command to the drawer pull-out mechanism, which then drives the gripping rod to extend again until the surface source storage drawer returns to its initial position and is positioned. After that, the control console retracts the gripping rod, completing one verification. S4.7, Repeat steps S4.2-S4.6 multiple times until all standard surface sources on the shielded cabinet have been verified. Then, the control console generates the test record and certificate electronic version of the instrument to be verified and stores the test record.

10. The calibration method for the surface contamination detector according to claim 9, characterized in that, A ranging sensor is installed on the calibration platform. The ranging sensor is communicatively connected to the control console and can detect the real-time height of the calibration platform and transmit the real-time height of the calibration platform to the control console. The control console sends corresponding drive commands to the platform drive mechanism based on the received real-time height of the calibration platform.

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