High-precision non-contact measuring tool for narrow space

Abstract

The utility model discloses a high-precision non-contact measuring tool for a narrow space. The high-precision non-contact measuring tool comprises a detection module part, a reference assembly and a calibration assembly, a plurality of positioning keys are uniformly distributed in the pressure container along the circumferential direction at intervals, and each positioning key is provided with a detection module part; the detection module part is used for measuring the distance between the detection module part and the reactor internals and the distance between the detection module part and the reference assembly through laser, and then a gap between the reactor internals and a positioning key in the pressure container is obtained. The reference assembly is used as a reference surface where the end face of the positioning key is located and assists the detection module part in obtaining a gap between the reactor internals and the positioning key. And the calibration assembly adjusts and calibrates the light spot of the laser in the detection module part before the detection module performs gap measurement. The device has the advantages that the safety risk caused by the fact that measuring personnel enter a narrow space for a long time for measuring operation is avoided, the dependence on the skill level of the measuring personnel is reduced, and the measuring precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of in-reactor component installation space measurement of a reactor, and particularly relates to a high-precision non-contact measurement tool for a narrow space. Background Technique

[0002] During the installation of in-reactor components of a reactor, the side wall of the cylindrical in-reactor component is radially positioned with the positioning keys inside the pressure vessel through a plurality of adjusting pads evenly distributed in the circumferential direction (see Figure 1 ). Since the cylindrical in-reactor component and the pressure vessel are produced by two different manufacturers respectively, there are manufacturing errors. Therefore, on-site measurement and fitting of adjusting pads are required during the installation of in-reactor components of the reactor. The thickness of the adjusting pad, that is, the gap measurement range, is about 12 mm, and the machining accuracy requirement is ±0.05 mm (see Figure 2 and Figure 3 ). The adjusting pad is located inside the pressure vessel. Due to the high equipment matching accuracy and small installation space, it is difficult to measure the size of the adjusting pad in a narrow space. In the past, similar measurements used an indirect measurement method of pressing red lead marks on a long rod pad, but it is not suitable for high-precision measurement, or a person with a smaller build drills into the equipment gap through a manhole for measurement, but the risk is high, and the space at the measurement position is limited, and general measuring tools such as micrometers and calipers cannot be operated. Content of the Utility Model

[0003] The purpose of the utility model is to provide a high-precision non-contact measurement tool for a narrow space, so as to solve the foregoing problems existing in the prior art.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A high-precision non-contact measurement tool for a narrow space includes a detection module component, a reference component, and a calibration component; a plurality of positioning keys are evenly spaced along the circumferential direction inside the pressure vessel, and a detection module component is arranged on each of the positioning keys; the detection module component is used to respectively measure the distances between it and the in-reactor component and the reference component by using a laser, so as to obtain the gap between the in-reactor component and the positioning key inside the pressure vessel; the reference component is used as the reference plane where the end face of the positioning key is located to assist the detection module component in obtaining the gap between the in-reactor component and the positioning key; the calibration component adjusts and calibrates the laser spot in the detection module component before the gap measurement.

[0006] Preferably, the detection module component includes a measurement component and a moving fixture, the measurement component is arranged on the moving fixture, and the moving fixture is clamped on the positioning key; the horizontal position and pitch angle of the measurement component on the positioning key can be changed through the moving fixture.

[0007] Preferably, the measurement component includes a housing, a circuit board, a aviation plug, a signal amplification sensor, a laser displacement sensor, and a control unit. The circuit board, the signal amplification sensor, and the laser displacement sensor are all disposed in the housing. The aviation plug is disposed on the outer wall of the housing. An opening for laser to enter and exit is provided at a position of the housing corresponding to the laser displacement sensor. One end of the signal amplification sensor is connected to the laser displacement sensor, and the other end is connected to the circuit board. One end of the laser displacement sensor is connected to the aviation plug, and the other end is connected to the control unit.

[0008] Preferably, one side of the circumferential direction of the housing is provided with an opening to form a disassembly and assembly opening, and a cover plate fixedly connected to the housing is correspondingly covered on the disassembly and assembly opening.

[0009] Preferably, the moving fixture includes a clip, a fixture horizontal adjustment handwheel, an angle adjustment handwheel, and an angle adjustment bolt. The clip is correspondingly clamped on the positioning member. Vertical fixture center lines are provided on the front and rear end faces of the clip. The fixture horizontal adjustment handwheel is disposed on the side surface of the clip. The housing, the angle adjustment handwheel, and the angle adjustment bolt are all disposed on the upper surface of the clip, and the angle adjustment bolt and the angle adjustment handwheel are respectively located in front of and behind the housing.

[0010] The fixture center line is used to align with the positioning key line on the positioning key. The fixture horizontal adjustment handwheel is used to adjust the horizontal position of the clip on the positioning key and achieve position fixation. The angle adjustment handwheel and the angle adjustment bolt are used to adjust the pitching angle of the clip on the positioning key and achieve position fixation.

[0011] Preferably, the clip includes a horizontal plate and clamping plates. A clamping plate extending vertically downward is respectively provided on opposite sides of the lower surface of the horizontal plate. The horizontal plate is disposed on the upper surface of the positioning key, and the two clamping plates are respectively disposed on opposite sides of the positioning key to clamp the clip on the positioning key.

[0012] A center line extending along its length direction is provided in the middle of the horizontal plate. Fixture horizontal adjustment handwheels are provided on both clamping plates. The housing is fixed on the horizontal plate, and the angle adjustment handwheel and the angle adjustment bolt are respectively disposed on the horizontal plates on the front and rear sides of the housing.

[0013] Preferably, the detection module component further includes a shield. The shield covers the outside of the measurement assembly. On one circumferential side of the shield, there is a light outlet for the laser to enter and exit corresponding to the opening. On the top of the shield, there is a wire outlet hole for the connection wire to enter and exit, and a wire outlet ring is provided on the wire outlet hole. On the opposite sides of the lower end of the shield, at least one fixing clip extending downward is respectively provided. The fixing clip extends outside the positioning key, and a shield adjustment handwheel is provided on the fixing clip. The shield adjustment handwheel is used to adjust the horizontal position of the shield on the positioning key and fix the position.

[0014] Preferably, the reference component includes a reference plate and a support square column. In the middle of one side of the reference plate, there is a reference center scale line extending along its length direction. At the same height on both sides of the reference center scale line, a support square column perpendicular to the reference plate is respectively provided. The support square column is placed on the upper surface of the positioning key, and the reference plate fits against the front end face of the positioning key. The reference center line is used to align with the positioning key scale line on the positioning key.

[0015] Preferably, the calibration component includes an installation adjustment part and a graticule plate. The installation adjustment part is arranged on the front end face of the positioning key. The graticule plate is fixed on the upper vertical surface of the installation adjustment part through a graticule plate pressing piece. The graticule plate is vertically arranged and its center faces the detection module component, and is used to calibrate the laser spot. On the vertical surface of the horizontal end of the installation adjustment part close to the detection module component, there is a vertical calibration center scale line, and the calibration center scale line is used to align with the positioning scale line on the positioning key.

[0016] Preferably, the installation adjustment part includes an L-shaped installation part and a U-shaped adjustment part. The installation part is arranged at the upper end of the adjustment part. On the horizontal end of the installation part, there is a fixing bolt, and on the vertical surface of the horizontal end of the installation part close to the detection module component, there is a calibration center scale line. The graticule plate is arranged at the vertical end of the installation part. The adjustment part fits and clamps on the front end face of the positioning key. On the clamping end of the adjustment part, there is a calibration adjustment handwheel, and the calibration adjustment handwheel is used to adjust the horizontal position of the calibration component on the positioning key.

[0017] The beneficial effects of the present utility model are as follows: The measuring tool provided by the present utility model avoids the safety risks caused by the measurement personnel entering the narrow space for measurement operations for a long time, reduces the dependence on the skill level of the measurement personnel, and improves the measurement accuracy. In addition, multi-group simultaneous measurement can be realized, improving the measurement efficiency and reducing the working time. Description of the Drawings

[0018] Figure 1 is a schematic diagram of the installation state of in-core components in the embodiment of the present utility model;

[0019] Figure 2 It is a partial schematic diagram of the positioning member and the adjusting pad in the pressure vessel in the embodiment of the present utility model;

[0020] Figure 3 It is a top view of the gap at the installation position of the adjusting pad in the embodiment of the present utility model;

[0021] Figure 4 It is a schematic diagram of the detection component (with a shield) in the embodiment of the present utility model;

[0022] Figure 5 It is a schematic diagram of the detection component (without a shield) in the embodiment of the present utility model

[0023] Figure 6 It is an internal schematic diagram of the detection component in the embodiment of the present utility model;

[0024] Figure 7 It is a schematic diagram of the shield in the embodiment of the present utility model;

[0025] Figure 8 It is a schematic diagram of the reference component in the embodiment of the present utility model;

[0026] Figure 9 It is a schematic diagram of the measurement device and the reference component used in cooperation in the embodiment of the present utility model;

[0027] Figure 10 It is a schematic diagram of the calibration component in the embodiment of the present utility model;

[0028] Figure 11 It is a schematic diagram of the measurement device and the calibration component used in cooperation in the embodiment of the present utility model;

[0029] Figure 12 It is a diagram of the measurement software interface in the embodiment of the present utility model;

[0030] Figure 13 It is a schematic diagram of gap measurement in the embodiment of the present utility model.

[0031] In the figure: 1. In-core structure; 2. Adjusting shim; 3. Positioning key; 31. Positioning key graduation line; 4. Detection module component; 41. Measuring component; 411. Housing; 412. Circuit board; 413. Aviation plug; 414. Laser displacement sensor; 415. Signal amplification sensor; 416. Fixed plate; 417. Mounting shim; 418. Cover plate; 42. Moving fixture; 421. Clip; 422. Fixture horizontal adjustment handwheel; 423. Angle adjustment bolt; 424. Angle adjustment handwheel; 425. Fixture center graduation line; 43. Shield; 431. Light outlet; 432. Cable outlet loop; 433. Fixed clamp; 434. Shield adjustment handwheel; 5. Reference component; 51. Reference plate; 52. Support square column; 53. Reference center graduation line; 6. Calibration component; 61. Reticle; 62. Reticle pressing piece; 63. Installation part; 64. Adjustment part; 65. Fixed bolt; 66. Calibration adjustment handwheel; 67. Calibration center graduation line. Detailed implementation mode

[0032] In order to make the purpose, technical solution and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific implementation modes described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0033] As Figure 4 shown, in this embodiment, a high-precision non-contact measuring tool for a narrow space is provided, including a detection module component 4, a reference component 5 and a calibration component 6; a plurality of positioning keys 3 are evenly arranged at intervals along the circumferential direction inside the pressure vessel, and a detection module component 4 is arranged on each of the positioning keys 3; the detection module component 4 is used to respectively measure the distances between it and the in-core structure 1 and the reference component 5 by using laser, so as to obtain the gap between the in-core structure 1 and the positioning key 3 inside the pressure vessel; the reference component 5 is used as the reference plane where the end face of the positioning key 3 is located to assist the detection module component 4 to obtain the gap between the in-core structure 1 and the positioning key 3; the calibration component 6 adjusts and calibrates the laser spot in the detection module component 4 before the gap measurement.

[0034] A positioning key graduation line 31 is arranged on the upper surface of the positioning key 3 inside the pressure vessel. It is a graduation line pointing to the theoretical center of the pressure vessel scribed by the pressure vessel manufacturer after the welding of the positioning key 3 inside the pressure vessel. It is the measurement position reference of the adjusting shim 2 and also the installation and positioning reference of the high-precision non-contact measuring tool (see Figure 2 ).

[0035] I. Detection module component

[0036] In this embodiment, the detection module component 4 includes a measurement component 41 and a moving fixture 42. The measurement component 41 is arranged on the moving fixture 42, and the moving fixture 42 is clamped on the positioning key 3. The horizontal position and pitch angle of the measurement component 41 on the positioning key 3 can be changed by the moving fixture 42.

[0037] (1) Measurement component

[0038] As Figure 6 shown, the measurement component 41 includes a housing 411, a circuit board 412, a aviation plug 413, a signal amplification sensor 415, a laser displacement sensor 414 and a control unit.

[0039] The housing 411 is fixed above the moving fixture 42 by bolts to protect the corresponding components arranged inside it. The laser displacement sensor 414 is installed inside the housing 411 by a plurality of round head cross bolts. The emission end and the receiving end of the laser of the laser displacement sensor 414 are aligned with the openings provided on the housing 411, and the emission and reception of the laser spot both pass through the openings. The laser displacement sensor 414 is a sensor of a high-precision non-contact laser measurement tool, with a measurement range of: 80 - 120 mm, a red semiconductor laser, a wavelength of: 655 nm, a measurement error of: ≤0.01 mm, and a measurement resolution of: 0.001 mm. The signal amplification sensor 415 is installed inside the housing 411 through a mounting pad 417 and a fixing plate 416, and it serves as a signal amplifier for the laser displacement sensor 414. One end of the signal amplification sensor 415 is connected to the laser displacement sensor 414, and the other end is connected to the circuit board 412. The circuit board 412 is connected to the aviation plug 413 installed at the rear end of the housing 411. One end of the data line of the laser displacement sensor 414 is plugged into the aviation plug 413 at the rear end of the housing 411, and the other end is connected to the control unit. One end of the data lines of the laser displacement sensors 414 of each detection module component 4 is uniformly plugged into the control unit. The control unit supplies power to all the detection module components 4 and conducts data communication, and transmits the collected data to the dedicated measurement software on a host computer (such as a laptop).

[0040] To facilitate the disassembly, assembly, replacement, inspection and repair of the relevant components inside the housing 411, an access opening is formed by opening one side of the housing 411 in the circumferential direction, and a detachable cover plate 418 is provided on the access opening.

[0041] (2) Moving fixture

[0042] As Figure 5As shown, the movable fixture 42 includes a clip 421, a fixture horizontal adjustment handwheel 422, an angle adjustment handwheel 424, and an angle adjustment bolt 423; the clip 421 is correspondingly clamped on the positioning member; vertical fixture center engraved lines 425 are provided on the front and rear end faces of the clip 421, the fixture horizontal adjustment handwheel 422 is arranged on the side surface of the clip 421, the housing 411, the angle adjustment handwheel 424, and the angle adjustment bolt 423 are all arranged on the upper surface of the clip 421, and the angle adjustment bolt 423 and the angle adjustment handwheel 424 are respectively located in front of and behind the housing 411;

[0043] The fixture horizontal adjustment handwheel 422 is used to adjust the horizontal position of the clip 421 on the positioning key 3 and fix the position, and the angle adjustment handwheel 424 and the angle adjustment bolt 423 are used to adjust the pitching angle of the clip 421 on the positioning key 3 and fix the position.

[0044] The clip 421 includes a horizontal plate and clamping plates. A clamping plate extending vertically downward is respectively arranged on the relative two sides of the lower surface of the horizontal plate. The horizontal plate is arranged on the upper surface of the positioning key 3, and the two clamping plates are respectively arranged on the relative two sides of the positioning key 3 so that the clip 421 is clamped on the positioning key 3;

[0045] The center line extending along its length direction is arranged in the middle of the horizontal plate. The fixture horizontal adjustment handwheel 422 is arranged on both clamping plates. The housing 411 is fixed on the horizontal plate, and the angle adjustment handwheel 424 and the angle adjustment bolt 423 are respectively arranged on the horizontal plates on the front and rear sides of the housing 411.

[0046] The main body in the movable fixture 42 is the clip 421. Five handwheels and one adjustment bolt are installed on the clip 421. There is a fixture center engraved line 425 at the front end of the clip 421. During installation, adjust the fixture horizontal adjustment handwheel 422 in the horizontal direction. After aligning the fixture center engraved line 425 at the front end of the clip 421 with the positioning key engraved line 31 on the positioning key 3, slightly tighten the fixture horizontal adjustment handwheel 422. When the laser spot is precisely adjusted to the center of the reticle 61 of the calibration assembly 6, precisely adjust the fixture horizontal adjustment handwheel 422 to adjust the horizontal position of the laser spot. Adjust the angle adjustment handwheel 424 and the adjustment bolt on the upper surfaces of the front and rear ends of the clip 421 to adjust the pitching angle of the laser and precisely adjust the vertical position of the laser spot. Until the laser spot is precisely adjusted to the center of the reticle 61 of the calibration assembly 6, tighten each handwheel to fix the detection module component 4.

[0047] (3) Shield

[0048] As Figure 7As shown in the figure, the detection module component 4 further includes a shield 43. The shield 43 covers the outside of the measurement component 41. A light outlet 431 for the laser to enter and exit is provided on one circumferential side of the shield 43 corresponding to the opening. A wire outlet hole for the connection wire to enter and exit is provided at the top of the shield 43, and a wire outlet loop 432 is provided on the wire outlet hole. At least one fixing clip 433 extending downward is respectively provided on the opposite sides at the lower end of the shield 43. The fixing clip 433 extends outside the positioning key 3, and a shield adjustment handwheel 434 is provided on the fixing clip 433. The shield adjustment handwheel 434 is used to adjust the horizontal position of the shield 43 on the positioning key 3 and fix the position.

[0049] The shield 43 is a bottom-opening cover structure for protecting the detection module component 4. After the detection module component 4 is installed, the shield 43 is installed outside it. The fixing clip 433 is installed at the lower part of the shield 43 and is used for fixing the shield 43 to the positioning key 3. The wire outlet loop 432 is stuck in the wire outlet hole to prevent the cable from being scratched. There are 2 groups of shield adjustment handwheels 434, which are respectively installed at the front and rear ends of the lower part of the shield 43. The horizontal position of the shield 43 can be adjusted through the shield adjustment handwheel 434 to prevent the shield 43 from interfering with the detection module component 4. After installation, it is tightened and fixed through the shield adjustment handwheel 434. There is a light outlet 431 at the front end of the shield 43 for the laser of the internal detection module component 4 to pass through.

[0050] II. Reference Component

[0051] In this embodiment, as Figure 8 and Figure 9 shown, the reference component 5 includes a reference plate 51 and a support square column 52. A reference center scale line 53 extending along its length direction is provided in the middle of one side of the reference plate 51. A support square column 52 perpendicular to the reference plate 51 is provided at the same height on both sides of the reference center scale line 53. The support square column 52 is placed on the upper surface of the positioning key 3, and the reference plate 51 is attached to the front end face of the positioning key 3. The reference center line 53 is used to align with the positioning key scale line 31 on the positioning key 3.

[0052] The reference plate 51 is in contact with the end face of the positioning key 3 inside the pressure vessel. There is a reference center graduation line 53 in the middle and lower part of the reference plate 51. After the reference plate 51 is fitted with the end face of the positioning key 3 inside the pressure vessel, the reference center graduation line 53 is aligned with the positioning key graduation line 31, indicating that the alignment has been completed. There are two protruding support square columns 52 in the middle part of the reference plate 51. When using the reference plate 51, the support square columns 52 can be directly placed on the upper surface of the positioning key 3 inside the pressure vessel, which can effectively reduce the interference caused by manual support. The reference plate 51 is used to measure the initial distance between the detection module component 4 and the end of the pressure vessel positioning key 3. Since the measurement range of the laser displacement sensor 414 in the detection module component 4 is 100mm ± 20mm, during the installation and adjustment process of the detection module component 4, it is necessary to first use the reference component 5 to adjust the initial distance between the detection module component 4 and the end face of the lower rib plate of the cylinder body to about 100mm, so as to ensure that during the measurement process of the high-precision non-contact measurement tool, the distance from the side wall of the cylindrical in-vessel component 1 can be within the measurement range.

[0053] III. Calibration Component

[0054] In this embodiment, as Figure 10 and Figure 11 shown, the calibration component 6 includes an installation and adjustment part and a graticule plate 61; the installation and adjustment part is arranged on the front end face of the positioning key 3, and the graticule plate 61 is fixed on the upper vertical surface of the installation and adjustment part through a graticule plate pressing piece 62. The graticule plate 61 is vertically arranged and its center faces the detection module component 4, and is used for calibrating the laser spot; a vertical calibration center graduation line 67 is arranged on the vertical surface of the horizontal end of the installation and adjustment part close to the detection module component 4, and the calibration center graduation line 67 is used to align with the positioning graduation line on the positioning key 3.

[0055] The installation and adjustment part includes an L-shaped installation part 63 and a U-shaped adjustment part 64. The installation part 63 is arranged at the upper end of the adjustment part 64. A fixing bolt 65 is arranged at the horizontal end of the installation part 63, and a calibration center graduation line 67 is arranged on the vertical surface of the horizontal end of the installation part 63 close to the detection module component 4. The graticule plate 61 is arranged at the vertical end of the installation part 63; the adjustment part 64 is fitted and clamped on the front end face of the positioning key 3, and a calibration adjustment handwheel 66 is arranged on the clamping end of the adjustment part 64. The calibration adjustment handwheel is used to adjust the horizontal position of the calibration component 6 on the positioning key 3.

[0056] Before actual measurement, the calibration plate assembly precisely centers and adjusts the light spot of the laser displacement sensor 414 in the detection module component 4. The calibration assembly 6 is installed at the front end of the pressure vessel positioning key 3, and the calibration assembly 6 contacts the end face of the positioning key 3 inside the pressure vessel. The cross on the graticule 61 is the center that the light spot of the laser displacement sensor 414 needs to be centered on. During the installation process of the calibration assembly 6, it is fixed by the fixing bolts 65. There is a calibration center graduation line 67 at the middle position of the horizontal end of the installation part 63, and there is a calibration adjustment handwheel 66 on each of the left and right clamping ends of the adjustment part 64. During the installation process of the calibration assembly 6, the calibration center graduation line 67 is aligned with the positioning key graduation line 31 through the calibration adjustment handwheel 66. After the calibration assembly 6 is correctly installed on the end face of the positioning key 3, the position of the laser light spot in the detection module component 4 is precisely adjusted, and the position of the laser light spot is precisely adjusted to the cross center of the graticule 61.

[0057] IV. Measurement Software

[0058] In this embodiment, as Figure 12 and Figure 13 shown, a dedicated measurement software is built into the upper computer. The dedicated measurement software is used to process and display the laser measurement result data. The display interface includes the initial value (L1), the process value (L2), and the result value (L2 - L1). The measurement buttons include calibration / stop and measurement. Clicking the calibration button displays the initial value. After clicking the measurement button, the calibration button will automatically be converted into a stop button. The measurement button can be clicked multiple times to form a measurement average value. Clicking the stop button automatically generates the process value and the result value. After completing the measurement of each group of data in sequence, click the save button to generate a measurement report.

[0059] The specific measurement process of the measurement tool is as follows:

[0060] (1) Before the installation of the cylindrical reactor internals 1, personnel descend to the bottom of the cylinder and sequentially install the circumferential groups of detection module components 4 on the positioning keys 3 inside the pressure vessel;

[0061] (2) Align the fixture center graduation line 425 of each detection module component 4 with the positioning key graduation line 31 in sequence;

[0062] (3) Connect each detection module component 4 to the upper computer through data lines and the control unit in sequence;

[0063] (4) Install the calibration assembly 6, make it closely fit with the end face of the positioning key 3 inside the pressure vessel, and at the same time ensure that the calibration center graduation line 67 is aligned with the positioning key graduation line 31, and fix the calibration assembly 6;

[0064] (5) Check whether the laser light spot of the detection module component 4 is located at the cross bull's-eye position of the graticule 61, and finely adjust the detection module component 4 according to the actual situation so that the laser light spot is located at the cross bull's-eye;

[0065] (6) Remove the calibration component 6 and calibrate the measurement benchmarks of each group of detection module components 4 in sequence according to the requirements in (4) - (5).

[0066] (7) Install and fix the protective cover 43 in sequence.

[0067] (8) Install the reference component 5 on the positioning key 3 inside the pressure vessel, closely fit the side and end faces of the reference component 5 with the corresponding faces of the positioning key 3 inside the pressure vessel, and at the same time ensure that the reference center scale line 53 is aligned with the positioning key scale line 31.

[0068] (9) Open the measurement software, click on calibration, and measure the initial data L1 of each group in sequence.

[0069] (10) Install the cylindrical in-vessel component 1 in place with alignment.

[0070] (11) Use the measurement software to click on measurement in sequence, then click the stop button, and automatically complete the measurement of the data L2 of each group in sequence. The measured value of the gap between the side wall of the positioning key 3 and the outer wall of the cylindrical in-vessel component 1 is L2 - L1 (see Figure 11 ); click save to generate a gap measurement report.

[0071] By adopting the above technical solutions disclosed by the present utility model, the following beneficial effects are obtained:

[0072] The present utility model provides a high-precision non-contact measurement tool for narrow spaces, avoiding the safety risks caused by measurement personnel entering narrow spaces for long-term measurement operations, reducing the dependence on the skill level of measurement personnel, and improving the measurement accuracy. In addition, multi-group simultaneous measurement can be realized, improving the measurement efficiency and reducing the working time.

[0073] The above is only the preferred embodiment of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A high-precision non-contact measuring tool for narrow spaces, characterized in that: It includes a detection module component, a reference component, and a calibration component; a plurality of positioning keys are evenly spaced along the circumferential direction inside the pressure vessel, and a detection module component is provided on each of the positioning keys; the detection module component is used to respectively measure the distances between it and the in-core structure and the reference component by using lasers, so as to obtain the gap between the in-core structure and the positioning keys inside the pressure vessel; the reference component is used as the reference plane where the end face of the positioning key is located to assist the detection module component in obtaining the gap between the in-core structure and the positioning key; the calibration component adjusts and calibrates the laser spot in the detection module component before the gap measurement is carried out.

2. The high-precision non-contact measurement tool for narrow spaces according to claim 1, characterized in that: The detection module component includes a measurement component and a moving fixture. The measurement component is arranged on the moving fixture, and the moving fixture is clamped on the positioning key; the horizontal position and pitch angle of the measurement component on the positioning key can be changed through the moving fixture.

3. The high-precision non-contact measurement tool for narrow spaces according to claim 2, characterized in that: The measurement component includes a housing, a circuit board, a aviation plug, a signal amplification sensor, a laser displacement sensor, and a control unit. The circuit board, the signal amplification sensor, and the laser displacement sensor are all arranged in the housing. The aviation plug is arranged on the outer wall of the housing, and an opening for the laser to enter and exit is provided at the position of the housing corresponding to the laser displacement sensor; one end of the signal amplification sensor is connected to the laser displacement sensor, and the other end is connected to the circuit board. One end of the laser displacement sensor is connected to the aviation plug, and the other end is connected to the control unit.

4. The high-precision non-contact measurement tool for narrow spaces according to claim 3, characterized in that: One side of the housing is open in the circumferential direction to form a disassembly and assembly opening, and a cover plate fixedly connected to the housing is correspondingly covered on the disassembly and assembly opening.

5. The high-precision non-contact measurement tool for narrow spaces according to claim 3, characterized in that: The moving fixture includes a clamp, a fixture horizontal adjustment handwheel, an angle adjustment handwheel, and an angle adjustment bolt; the clamp is correspondingly clamped on the positioning key; vertical fixture center lines are provided on the front and rear end faces of the clamp. The fixture horizontal adjustment handwheel is arranged on the side of the clamp. The housing, the angle adjustment handwheel, and the angle adjustment bolt are all arranged on the upper surface of the clamp, and the angle adjustment bolt and the angle adjustment handwheel are respectively located in front of and behind the housing. The fixture center line is used to align with the positioning key line on the positioning key. The fixture horizontal adjustment handwheel is used to adjust the horizontal position of the clamp on the positioning key and realize position fixation. The angle adjustment handwheel and the angle adjustment bolt are used to adjust the pitch angle of the clamp on the positioning key and realize position fixation.

6. The high-precision non-contact measurement tool for narrow spaces according to claim 5, wherein: The clamp includes a horizontal plate and clamping plates. A clamping plate extending vertically downward is respectively arranged on the relative two sides of the lower surface of the horizontal plate. The horizontal plate is arranged on the upper surface of the positioning key, and the two clamping plates are respectively arranged on the relative two sides of the positioning key so that the clamp is clamped on the positioning key. A center line extending along its length direction is provided in the middle of the horizontal plate. Fixture horizontal adjustment handwheels are arranged on both clamping plates. The housing is fixed on the horizontal plate, and the angle adjustment handwheel and the angle adjustment bolt are respectively arranged on the horizontal plates on the front and rear sides of the housing.

7. The high-precision non-contact measurement tool for narrow spaces according to claim 3, wherein: The detection module component further includes a shield. The shield is arranged outside the measurement component. A light outlet for the laser to enter and exit is provided on one circumferential side of the shield corresponding to the opening. An outlet hole for the connection line to enter and exit is provided at the top of the shield, and an outlet loop is arranged on the outlet hole. At least one fixing clip extending downward is respectively arranged on opposite sides at the lower end of the shield. The fixing clip extends outside the positioning key, and a shield adjustment handwheel is arranged on the fixing clip. The shield adjustment handwheel is used to adjust the horizontal position of the shield on the positioning key and fix the position.

8. The high-precision non-contact measurement tool for narrow spaces according to claim 1, characterized in that: The reference component includes a reference plate and a support square column. A reference center line is arranged in the middle of one side of the reference plate and extends along its length direction. A support square column perpendicular to the reference plate is respectively arranged at the same height on both sides of the reference center line. The support square column is placed on the upper surface of the positioning key, and the reference plate is attached to the front end surface of the positioning key. The reference center line is used to align with the positioning key line on the positioning key.

9. The high-precision non-contact measurement tool for narrow spaces according to claim 1, wherein: The calibration component includes an installation adjustment part and a reticle. The installation adjustment part is arranged on the front end surface of the positioning key. The reticle is fixed on the upper vertical surface of the installation adjustment part through a reticle pressing piece. The reticle is arranged vertically and its center faces the detection module component, and is used to calibrate the laser spot. A vertical calibration center line is arranged on the vertical surface of the horizontal end of the installation adjustment part close to the detection module component. The calibration center line is used to align with the positioning line on the positioning key.

10. The high-precision non-contact measurement tool for narrow spaces according to claim 9, characterized in that: The installation adjustment part includes an L-shaped installation part and a U-shaped adjustment part. The installation part is arranged at the upper end of the adjustment part. A fixing bolt is arranged at the horizontal end of the installation part, and a calibration center line is arranged on the vertical surface of the horizontal end of the installation part close to the detection module component. The reticle is arranged at the vertical end of the installation part. The adjustment part is attached and clamped on the front end surface of the positioning key, and a calibration adjustment handwheel is arranged on the clamping end of the adjustment part. The calibration adjustment handwheel is used to adjust the horizontal position of the calibration component on the positioning key.

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