Underwater non-contact aperture measurement device and method in high radiation environment

Abstract

The application belongs to the technical field of nuclear power unit in-service power plant maintenance, and discloses a high-radiation underwater non-contact aperture measuring device and method, the device comprises a sealed cabin body and a cabin cover, the cabin body is provided with an opening and is installed with glass, the bottom is provided with a center boss and two side bosses, the center boss is installed with a laser module and is arranged towards the corresponding opening to emit linear laser, the two side bosses are installed with cameras and are arranged towards the corresponding openings, and the bottom surface of the cabin body is installed with a contact contact type circuit board; the method utilizes the device to measure the aperture. The application can realize high-radiation underwater non-contact rapid aperture measurement, realize high-precision measurement of the to-be-measured aperture in a high-radiation underwater environment, and the measurement precision can reach 0.02 mm.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of nuclear power unit in-service power plant maintenance, and particularly relates to a high-radiation underwater non-contact aperture measuring device and method. BACKGROUND

[0002] Nuclear power generation is to generate electricity by using the heat energy released by the self-sustained chain fission reaction of nuclear fuel. After the first criticality of a pressurized water reactor nuclear power plant, the nuclear fuel assembly, the primary system and the equipment have high radioactivity, the maintenance environment is extremely harsh, and the maintenance personnel cannot normally approach, so that the conventional means cannot be used for maintenance operation.

[0003] At present, the primary system equipment such as the pressure vessel of the nuclear power plant is in a high radiation environment for a long time, and it is necessary to regularly monitor the state of the related equipment, or to measure the related shape and size during equipment maintenance. The measurement device can detect the characteristics of the equipment to provide reliable and basic data support for equipment maintenance.

[0004] The existing underwater non-contact measurement technology mainly adopts optical, acoustic and electromagnetic measurement technology. The equipment based on the above measurement technology is mostly used for underwater environment exploration, and the measurement accuracy is low. SUMMARY

[0005] The purpose of the application is to provide a high-radiation underwater non-contact aperture measuring device and method, which can realize aperture measurement in a harsh high-radiation underwater environment.

[0006] In order to achieve the above purpose, the application provides the following technical scheme:

[0007] In a first aspect, the application provides a high-radiation underwater non-contact aperture measuring device, which comprises a sealed cabin body and a cabin cover. The cabin body is provided with a plurality of openings and is installed with glass. The bottom of the cabin body is provided with a center boss and two side bosses. A laser module is installed on the center boss and is arranged towards the corresponding opening to emit linear laser. A camera is installed on the two side bosses and is arranged towards the corresponding opening. A contact touch type circuit board is installed on the bottom surface of the cabin body.

[0008] In some embodiments, the laser module comprises a fixed plate, a laser, and a laser mounting seat. The fixed plate has a vertical surface and a horizontal surface. The vertical surface has a laser mounting position. The laser is arranged through the fixed plate and the laser mounting seat. The laser module is installed in the cabin body through the horizontal surface.

[0009] In some embodiments, the laser mounting seat penetrates two laser mounting positions. The upper part has a cut plane and is processed with a top screw hole.

[0010] In some embodiments, the front surface of the cabin is provided with three openings, the outer side of the opening is provided with a thread and a sealing groove, the thread is used to install a pressing ring and press the glass, and the sealing groove is used to install an O-shaped sealing ring, the pressing ring presses the glass, and the glass extrudes the O-shaped sealing ring to achieve static sealing.

[0011] In some embodiments, the two side bosses are provided with a camera mounting plate, the camera is mounted on the camera mounting plate, and the camera mounting plate is processed with two oval grooves distributed along the circumference for adjusting the angle of the camera when the camera mounting plate is installed.

[0012] In some embodiments, a plurality of threaded holes are arranged around the center boss, a support column is installed on the threaded hole, one end of the support column is an external thread structure, the other end is an internal thread structure, and an electrical equipment mounting plate is installed on the support column.

[0013] In some embodiments, the inner bottom surface of the cabin is provided with a pumping hole, the pumping hole is a stepped hole, one section of the stepped hole is provided with a thread, a gas nozzle is installed on the pumping hole, the gas nozzle is a flange rotary body structure, a gas nozzle pressing nut is a ring structure and has an internal thread and an external thread, a gas nozzle screw is installed in the internal thread, and a front end boss of the gas nozzle screw is inserted into a gas inlet of the gas nozzle and sealed.

[0014] In some embodiments, the contact contact type circuit board is installed through a circuit board mounting seat, the inner side of the circuit board mounting seat is provided with a sealing groove, and an O-shaped sealing ring is installed in the sealing groove.

[0015] In some embodiments, an adapter plate is installed on the cabin, the bottom of the adapter plate is designed with a threaded hole, an adapter plate and a contact circuit board mounting rack are installed on the cabin, the bottom of the adapter plate is designed with a threaded hole, and an external contact circuit board is sealed and fixed with the contact circuit board mounting rack through potting.

[0016] In a second aspect, the application provides a high-radiation underwater non-contact aperture measurement method, which uses the high-radiation underwater non-contact aperture measurement device, comprising:

[0017] Step 1: Use an underwater long rod to transport the high-radiation underwater non-contact aperture measurement device to the position to be measured and keep it fixed;

[0018] Step 2: Collect point cloud data of the single pressure container bottom measured through part;

[0019] Step 3: Unify the spatial coordinates of the collected point cloud data, remove noise points, and generate point cloud data of the pressure container bottom measured through part;

[0020] Step 4: measuring the point cloud data of the measured penetrating piece at the bottom of the pressure container to obtain the shape and position dimensions.

[0021] Compared with the prior art, the high-radiation underwater non-contact aperture measuring device and method provided by the application have the following beneficial effects:

[0022] The application can realize high-radiation underwater non-contact rapid aperture measurement, realize high-precision measurement of the to-be-measured aperture in a high-radiation underwater environment, and the measurement accuracy can reach 0.02 mm.

[0023] Further, the device has high radiation resistance advantage and deep water operation capability, and can meet the underwater measurement requirements in a radiation environment. The device has a radiation resistance dose rate of not less than 25 KGy / h, a cumulative dose of not less than 2500 KGy, and can operate underwater at a depth of 20 meters.

[0024] Further, the device can realize long-distance communication and operation, and the communication distance is not less than 100 meters. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the application, the following will briefly introduce the drawings needed to be used in the technical description.

[0026] Figure 1 An isometric view of the high-radiation underwater non-contact aperture measuring device provided by the application is shown in the figure.

[0027] Figure 2 A front view of the high-radiation underwater non-contact aperture measuring device provided by the application is shown in the figure.

[0028] Figure 3 A top view of the high-radiation underwater non-contact aperture measuring device provided by the application is shown in the figure.

[0029] Figure 4 A bottom view of the high-radiation underwater non-contact aperture measuring device provided by the application is shown in the figure.

[0030] Figure 5 A partial sectional view of the air nozzle installation position provided by the application is shown in the figure.

[0031] Figure 6 An isometric view of the laser module provided by the application is shown in the figure.

[0032] Figure 7 An external cable connection schematic diagram provided by the application is shown in the figure.

[0033] Figure 8 A flowchart of the high-radiation underwater non-contact aperture measuring method provided by the application is shown in the figure.

[0034] Explanation of reference signs:

[0035] 1. Hull; 2. Hatch cover; 3. Electrical equipment; 4. Electrical equipment mounting plate; 5. Camera mounting plate; 6. Pressure ring; 7. Glass; 8. Lens; 9. Camera; 10. Support column; 11. Fixing plate; 12. Laser; 13. Laser mount; 14. Circuit board mount; 15. Contact circuit board; 16. Air nozzle; 17. Air nozzle clamping nut; 18. Air nozzle screw; 19. Adapter plate; 20. Cable sealing module; 21. Contact circuit board mounting bracket. Detailed Implementation

[0036] The following detailed description provides further details on specific implementation methods.

[0037] like Figures 1 to 7 As shown, this application provides an underwater non-contact aperture measurement device for high-radiation environments, including a cabin 1, a cover 2, a laser module, a camera mounting plate 5, a lens 8, a camera 9, a motor, a circuit board mounting base 14, a contact circuit board 15, an air nozzle 16, an air nozzle clamping nut 17, an air nozzle screw 18, an adapter plate 19, and a cable sealing module 20. This device is designed for aperture measurement in underwater nuclear radiation environments and has the advantages of high measurement accuracy and good radiation resistance.

[0038] The overall appearance of this device is a geometric shape with three windows on the front, consisting of a cabin 1 and a cover 2. The bottom of the cabin 1 has a contact circuit board 15 with contact points, which transmits electrical signals by contacting the contacts.

[0039] The cabin body 1 is machined from a single piece of material and has a sealing groove on the top for installing O-ring seals. The cover 2 is machined from sheet metal. During machining, the contact surface between the cover 2 and the cabin body 1 is required to have a high surface quality. The cover 2 and the cabin body 1 are fixed together with screws. The O-ring seals are pressed against each other between the cover 2 and the cabin body 1 to achieve a static seal on the contact surface.

[0040] The front of the cavity of the chamber 1 has three openings of the same size and structure. The outer side of the openings is designed with threads and sealing grooves. The three openings are used to install glass 7 (window glass), the threads are used to install the pressure ring 6 and press the glass 7 together, and the sealing grooves are used to install O-ring seals. During the process of the pressure ring 6 pressing the glass 7 together, the glass 7 squeezes the O-ring seal to achieve the static sealing requirement.

[0041] Optionally, the three openings are arranged at equal intervals.

[0042] like Figure 3 As shown, the bottom surface of the cabin 1 has three bosses machined on it. One boss is located in the middle (central boss), and the two bosses on the left and right (side bosses) are symmetrical and have threaded holes. The two bosses on the left and right are connected to the camera mounting plate 5, and the central boss is connected to the fixing plate 11.

[0043] The camera mounting plate 5 is a circular plate structure, with screw holes in the center position, the mounting holes of the camera 9 match the screw holes of the camera mounting plate 5 and are fixed by the countersunk head screws. The camera mounting plate 5 is processed with two oval grooves evenly distributed along the circumference, which is used to adjust the angle of the camera when installing the camera mounting plate 5. The camera mounting plate 5 is installed on the boss of the symmetrical structure on the left and right of the inner bottom surface of the cabin 1, and is fastened by screws after adjusting the position.

[0044] The boss at the center position of the inner bottom surface of the cabin 1 is processed with a through hole, and the boss is processed with a threaded hole, which is used to install the laser module.

[0045] The laser module includes a fixing plate 11, a laser 12, and a laser mounting seat 13. The laser mounting seat 13 is penetrated by two laser mounting positions, the upper part has a flat surface, and the flat surface is processed with a top screw hole. The fixing plate 11 is a 90° bending piece, the vertical surface has the same laser mounting position as the laser mounting seat 13, and has four through holes. The horizontal surface of the fixing plate 11 has two through holes. When the laser 12 penetrates through the fixing plate 11 and the laser mounting seat 13 at the same time, the laser 12 is fastened by the top screw, and the fixing plate 11 and the laser mounting seat 13 are fastened by the screw. Finally, the whole module is fixed in the cabin 1 through the two through holes on the horizontal surface of the fixing plate 11.

[0046] There are four threaded holes around the boss at the center position of the inner bottom surface of the cabin 1, and the support column 10 is installed on the threaded hole and is screwed by the external thread of the support column 10. The support column 10 is a columnar structure, one end of the support column 10 is an external thread structure, and the other end is an internal thread structure. The support column 10 is locked on the bottom surface of the cabin 1 through the external thread structure.

[0047] The lens 8 is screwed on the camera 9, and the camera 9 is connected to the camera mounting plate 5 through the bottom threaded hole.

[0048] The electrical equipment mounting plate 4 is a flat plate structure used to install electrical equipment. The plate surface of the electrical equipment mounting plate 4 has four openings, and the opening position corresponds to the position of the four threaded holes (the installation position of the support column 10) around the boss at the center position of the inner bottom surface of the cabin 1. The electrical equipment mounting plate 4 is installed on the support column 10 and is fastened by screws.

[0049] A plurality of rivets are riveted on the plate surface of the electrical equipment mounting plate 4, and the rivet position corresponds to the screw hole position of the electrical equipment. The electrical equipment is installed above the rivet, and is fastened by screws. The rivet position corresponds to the mounting screw hole of the electrical equipment, which is used to install the electrical equipment, and is specifically used to install the electrical equipment for data processing and control.

[0050] The right side of the inner bottom surface of the cabin body 1 is designed with a hole for inflating, and the structure of the hole is a stepped hole, one of which has a thread, the air nozzle 16 is a rotary body structure with a flange, the air nozzle compression nut 17 is an annular structure with internal and external threads, and the air nozzle screw 18 is a stepped shaft structure which can be machined from a top screw, the front section of which is a smooth boss, and the rear section is a threaded structure.

[0051] After the air nozzle 16 is inserted into the hole for inflating, the flange structure of the air nozzle 16 comes into contact with the stepped surface of the hole for inflating, when the air nozzle compression nut 17 is compressed by the thread (the hole for inflating has an internal thread, and the air nozzle compression nut 17 is compressed by the thread), after the air nozzle 16 is compressed, the air nozzle 16 forms a static seal with the cabin body 1, after the air nozzle screw 18 is screwed into the air nozzle compression nut 17 by the thread, the front end boss of the air nozzle screw 18 will be inserted into the air inlet of the air nozzle 16 and block the air inlet, so as to achieve complete sealing, the center of the outer bottom surface of the cabin body 1 is processed with a stepped hole for installing the contact type circuit board 15, each stepped plane requires high surface processing quality, and the stepped planes are uniformly distributed with threaded holes along the circumference.

[0052] The circuit board mounting seat 14 is a rotary body part, and the inner circular surface is designed with a positioning boss.

[0053] The contact type circuit board 15 is positioned by the groove on the circuit board and the boss on the inner circle of the circuit board mounting seat 14, and is fixed by the way of potting, the inner side of the circuit board mounting seat 14 is processed with a sealing groove, and an O-shaped sealing ring is installed in the sealing groove, when the locking screw is tightened, the O-shaped sealing ring is extruded to form a static seal, thus the whole cavity is a sealed cavity, which can be measured underwater.

[0054] The existing external contact circuit board and the contact circuit board mounting frame 21 are sealed and fixed by potting, the cable connected with the external contact circuit board passes through the cable sealing module 20 and is connected with the shore controller for data transmission. The adapter plate 19 is installed on the cabin body 1, the counterbore on the adapter plate 19 corresponds to the threaded hole on the outer bottom surface of the cabin body 1, and is fastened by screws, the bottom of the adapter plate 19 is designed with a threaded hole, which can be connected with a long rod device, so that the device reaches the specified area through the long rod, and stabilizes the long rod tool, so that the device measures the to-be-measured features.

[0055] The cable sealing module 20 is directly installed on the cabin body 1, the contact circuit board mounting frame 21 is directly installed on the cabin body 1, the adapter plate 19 is a plate with a circular via hole in the middle, which is used to connect the non-contact aperture measuring device and other equipment.

[0056] The device is based on binocular vision measurement principle in high radiation underwater environment to measure the aperture to be measured with high precision. The device function includes target appearance observation, surface defect size measurement, and target bending state detection, etc. The measurement precision can reach 0.02mm, and through the combination of multiple systems, the target measurement with a size of 4000mm can be realized.

[0057] The device is based on binocular vision technology, and the three-dimensional measurement of the target geometric parameters is realized through the parallax of the binocular image acquisition. In order to improve the system stability and prevent the problem of difficult matching due to the sparse features of the target surface, the device also increases the projection module for realizing the feature supplement of the target surface. The measurement device is based on single acquisition and processing technology, and can realize the surface three-dimensional information acquisition through one-time imaging, and then realize the accurate measurement of dynamic target. The measurement device adopts single bus mode, and has mechanical mounting hole position, which is convenient for electrical and mechanical integrated application or independent portable application.

[0058] In addition, based on the above device, the application also provides a non-contact aperture measurement method in high radiation underwater environment, which comprises the following steps:

[0059] Step 1: use the underwater long rod to transport the device to the position to be measured, and keep relative fixation (if necessary, the lifting equipment and sling can be used);

[0060] Step 2: use the existing software system (software and control box) to collect point cloud data of the single pressure container bottom measured penetrating part;

[0061] Step 3: unify the spatial coordinates of the electric cloud data collected by the device, remove the noise points, and generate the point cloud data of the pressure container bottom measured penetrating part;

[0062] Step 4: measure the point cloud data of the pressure container bottom measured penetrating part through the matching software, and obtain the shape and position size.

[0063] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application.

Claims

1. A non-contact underwater aperture measuring device for high-radiation environments, characterized in that, The enclosure includes a sealed chamber (1) and a cover (2). The chamber (1) has several openings and is fitted with glass (7). The bottom of the chamber (1) has a central boss and two side bosses. A laser module is installed on the central boss and is positioned facing the corresponding opening to emit a laser beam. Cameras (9) are installed on the two side bosses and are positioned facing the corresponding openings. A contact circuit board (15) is installed on the bottom surface of the chamber (1). An air inlet is provided on the bottom surface of the chamber (1). The air inlet is a stepped hole with a threaded section. An air nozzle (16) is installed on the air inlet. The air nozzle (16) is a rotating body structure with a flange. The air nozzle clamping nut (17) is a ring structure with internal and external threads. An air nozzle screw (18) is installed on the internal thread. The front end of the air nozzle screw (18) is inserted into the air inlet of the air nozzle (16) and sealed. The laser module includes a fixing plate (11), a laser (12), and a laser mounting base (13). The fixing plate (11) has a vertical surface and a horizontal surface. The vertical surface has a laser mounting position. The laser (12) is arranged through the fixing plate (11) and the laser mounting base (13). The laser module is installed in the cabin (1) through the horizontal surface.

2. The underwater non-contact aperture measuring device for high-radiation environments according to claim 1, characterized in that, The laser mounting base (13) has two laser mounting positions through it, and has a cutting plane on the upper part and is machined with a top screw hole.

3. The underwater non-contact aperture measuring device for high-radiation environments according to claim 1, characterized in that, The front of the cabin (1) is provided with three openings. The outer side of the openings is provided with threads and sealing grooves. The threads are used to install the pressure ring (6) and press the glass (7). The sealing grooves are used to install the O-ring seal. The pressure ring (6) presses the glass (7). The glass (7) squeezes the O-ring seal to achieve static sealing.

4. The underwater non-contact aperture measuring device for high-radiation environments according to claim 1, characterized in that, A camera mounting plate (5) is provided on the two side protrusions. The camera (9) is mounted on the camera mounting plate (5). The camera mounting plate (5) is machined with two oval grooves evenly distributed along the circumference, which are used to adjust the angle of the camera (9) when the camera mounting plate (5) is installed.

5. The underwater non-contact aperture measuring device for high-radiation environments according to claim 1, characterized in that, A number of threaded holes are arranged around the central boss, and a support column (10) is installed on the threaded hole. One end of the support column (10) has an external thread structure and the other end has an internal thread structure. An electrical equipment mounting plate (4) is installed on the support column (10).

6. The underwater non-contact aperture measuring device for high-radiation environments according to claim 1, characterized in that, The contact-type circuit board (15) is installed through a circuit board mounting base (14), and a sealing groove is provided on the inner side of the circuit board mounting base (14), and an O-ring is installed in the sealing groove.

7. The underwater non-contact aperture measuring device for high-radiation environments according to claim 1, characterized in that, The cabin (1) is equipped with an adapter plate (19) and a contact circuit board mounting bracket (21). The bottom of the adapter plate (19) is designed with threaded holes. The external contact circuit board and the contact circuit board mounting bracket (21) are sealed and fixed by potting.

8. A non-contact underwater aperture measurement method in a high-radiation environment, characterized in that, The underwater non-contact aperture measuring device for high-radiation environments according to any one of claims 1 to 7 comprises: Step 1: Use an underwater long rod to transport the high-radiation environment underwater non-contact aperture measuring device to the position to be measured and keep it fixed; Step 2: Collect point cloud data of the tested penetration component at the bottom of a single pressure vessel; Step 3: Unify the spatial coordinates of the collected electro-cloud data, remove noise, and generate point cloud data of the tested penetrating component at the bottom of the pressure vessel; Step 4: Measure the point cloud data of the penetrated part at the bottom of the pressure vessel to obtain its shape and dimensions.

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