Wall equally-dividing method for runner chamber void detection

Abstract

The invention relates to a wall equally-dividing method for runner chamber void detection, which comprises the following steps of: horizontally attaching an arc laser positioning device to the inner side wall of a runner chamber, and emitting two first lasers which are vertical to each other by the arc laser positioning device by taking a contact point as a center; distance information of the two first lasers is obtained according to the laser ranging principle, the posture of the arc laser positioning device is adjusted so that the distance between the two first lasers can be the same, and the two first lasers are used as a half space between the left boundary and the right boundary to be equally divided; with the circle center of the arc laser positioning device as the center, a plurality of second lasers distributed at equal angles are emitted from the first laser boundary, and then the inner side wall of the semicircular runner chamber is divided at equal intervals; under the condition that the center of the runner chamber cannot penetrate through the runner chamber, accurate equal division of the fixed number of circular rings is achieved at the non-circle-center position. Based on the distance between the two lasers with the 90-degree included angle and the boundary, the length of the telescopic rod is adjusted to achieve calibration, and the angle and the arc length are accurately and equally divided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydroelectric generating set, and particularly relates to a wall equidivision method for runner chamber void detection. BACKGROUND

[0002] In the operation and maintenance of the hydroelectric generating set, the runner chamber void detection is a crucial detection project. The runner chamber is usually made of thick steel plate, and the back is cast with concrete. In the long-term operation, the gap (i.e. "void") between the steel plate and the concrete may be caused due to vibration, material shrinkage or hydraulic impact. At present, the artificial knocking method is generally used for detection in the industry: the operating personnel use tools to knock the steel plate, and the change of the void condition is judged by listening to the characteristics of the clear or dull sound and comparing the knocking graph formed in the past years.

[0003] In order to systematically implement the detection and form a traceable record, the entire annular runner chamber inner wall needs to be divided into several regular areas. The traditional method is that the operating personnel use chalk and tape to roughly divide the circumference into 48 areas according to experience, and then knock and record the sound characteristics of each area, and evaluate the development or change trend of the void area by comparing the "knocking graph" formed in the past years.

[0004] However, the runner chamber is a curved surface structure, and the circumferential curvature at different heights is not consistent. If only the fixed straight line spacing is marked on the curved surface, significant spacing distortion will be caused in the area with large curvature, resulting in uneven actual partition size. Since the reference instrument cannot be erected at the center position of the runner chamber (which is usually occupied by the main shaft and other column structures), the traditional equiangular radial division method cannot be implemented, and the operating personnel can only approximately divide the arc length along the inner wall. This easily introduces human error, so that the boundaries of the divided areas in different years cannot be aligned, and even the first and last ends cannot be closed or the markers exceed the starting point. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a wall equidivision method for runner chamber void detection to solve the above problems.

[0006] The present application provides the following technical solutions: A wall equidivision method for runner chamber void detection, comprising a circular arc laser positioning device, comprising the following steps: The circular arc laser positioning device is horizontally attached to the inner side wall of the runner chamber, and two first lasers are emitted from the center of the contact point of the circular arc laser positioning device; According to the laser ranging principle, the distance information of the two first lasers is obtained, and the posture of the circular arc laser positioning device is adjusted so that the distance of the two first lasers is the same, and the space between the two first lasers as the left and right boundaries is divided equally; The arc laser positioning device is used for emitting a plurality of second lasers with equal angle distribution from the center of the arc laser positioning device, and then the inner side wall of the half circle runner chamber is equally divided. The above steps are repeated to equally divide the inner side wall of the other half circle runner chamber.

[0007] Preferably, the arc laser positioning device comprises a base plate and a rotating disc coaxially connected, and two groups of laser range finders emitting first lasers and forming a 90° angle are installed on the rotating disc.

[0008] Preferably, the rotating disc is provided with telescopic rods on opposite sides.

[0009] Preferably, a scale is arranged on the base plate, and a laser instrument is movably connected to the rotating disc through an arc-shaped sliding block sliding rail, and the second laser emitted by the laser instrument is used in cooperation with the scale to indicate the angle of the laser instrument relative to the laser range finder.

[0010] Preferably, the arc laser positioning device is installed on a tripod.

[0011] Preferably, a level is arranged on the base plate and / or the rotating disc.

[0012] Preferably, the line connecting the intersection points of the two laser boundaries and the runner chamber wall is the inner diameter of the runner chamber, and the arc laser positioning device emits two first laser lines perpendicular to each other at different positions and different angles and calculates the inner diameter of the runner chamber and calculates the average value.

[0013] Preferably, the arc laser positioning device comprises a base plate, two groups of laser range finders emitting first lasers and forming a 90° angle are installed on the base plate, and telescopic rods are arranged on opposite sides of the base plate. The base plate is hollow, and a light source is arranged on the side wall of the inner cavity of the base plate, the light source is located at the reverse intersection point of the two groups of laser range finders, and projection line grooves are uniformly arranged on the circumferential side wall of the base plate.

[0014] The present application has the following beneficial technical effects: The arc laser positioning device is attached to the inner side wall of the runner chamber, and in the case that the center of the runner chamber cannot be penetrated, the arc laser positioning device can accurately divide the runner chamber into a fixed number of equal parts at a non-center position.

[0015] Based on the distance between the two lasers with a 90° angle and the boundary, the length of the telescopic rod is adjusted to achieve calibration, and the angle and the arc length are accurately divided. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a first laser positioning diagram of the present application. Figure 2 It is a second laser positioning diagram of the present application. Figure 3 It is a structure schematic diagram of the arc laser positioning device of the present application; Figure 4 It is another structure schematic diagram of the arc laser positioning device of the second embodiment of the present application.

[0017] The reference signs in the drawings are as follows: 100, arc laser positioning device; 11, chassis; 12, rotating disc; 13, laser range finder; 14, telescopic rod; 15, projected line groove; 16, scale; 17, arc-shaped sliding block sliding rail; 18, laser instrument; 19, light source. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0019] Embodiment one: A wall equidivision method for rotating chamber void detection, with reference to Figures 1-3 , including an arc laser positioning device 100, which accurately equidivides the rotating chamber.

[0020] The arc laser positioning device 100 is equipped with a tripod with screw feet, which can adjust the horizontal height of the arc laser positioning device 100.

[0021] The arc laser positioning device 100 includes a chassis 11, a rotating disc 12, two groups of laser range finders 13, two groups of telescopic rods 14, and a laser instrument 18. The rotating disc 12 is coaxially and rotatably connected to the upper surface of the chassis 11. The two groups of laser range finders 13 are arranged perpendicularly to each other and installed on the rotating disc 12, so that the two laser beams emitted by the two groups of laser range finders 13 form a 90° angle, and the reverse intersection points of the laser beams emitted by the two groups of laser range finders 13 converge at the edge of the chassis 11 (designated as point c). The laser instrument 18 is installed on the rotating disc 12 and located between the two groups of laser range finders 13. The rotating disc 12 is provided with an arc-shaped sliding block sliding rail 17, and the laser instrument 18 moves and adjusts between the two groups of laser range finders 13 through the arc-shaped sliding block sliding rail 17, and the rotation of the laser instrument 18 is centered at point c.

[0022] The telescopic rods 14 are installed on the left and right sides of the chassis 11. The telescopic rods 14 can be electric telescopic rods or manual telescopic rods. The chassis 11 is provided with a scale 16. The laser beam emitted by the laser instrument 18 cooperates with the scale 16 to display the included angle between the laser instrument 18 and the laser range finders 13 (i.e., the included angle of the first laser beam and the second laser beam). The chassis 11 is provided with a level, and the chassis 11 is kept in a horizontal state by adjusting the tripod.

[0023] The two lasers emitted by the two sets of laser range finders 13 are arranged vertically, and the line connecting the intersection points of the two laser boundaries and the chamber wall is the inner diameter of the runner chamber. The inner diameter of the runner chamber is calculated at different positions and angles multiple times in advance, and the average value is calculated.

[0024] The processing end electrically connected to the two sets of laser range finders 13 is also included. According to the Pythagorean theorem and the real-time calculation and display of the inner diameter of the runner chamber by the two sets of laser range finders 13, the processing end calculates and displays the inner diameter of the runner chamber.

[0025] Working principle: The initial position a required for equal division is marked in the runner chamber, and the point c at the edge of the base plate 11 is attached to the inner wall a of the runner chamber. The base plate 11 is kept in a horizontal state, and the two sets of laser range finders 13 emit laser (such as the red line shown in Figure 2 ) to the inner side wall of the runner chamber and calculate the distance. The laser range finder 13 has a digital display to calculate the distance. The length of the two sets of telescopic rods 14 is adjusted, and the movable end of the telescopic rod 14 abuts against the inner side wall of the runner chamber, so as to adjust the attitude of the base plate 11. Until the laser distances emitted by the two sets of laser range finders 13 are the same (and the calculated inner diameter is close to the average value of the inner diameter of the runner chamber), and the laser is marked with lines b and c. Assuming that the inner side wall of the runner chamber is to be divided into n regions, n = 48; a plurality of second lasers at an angle a are emitted from the first laser boundary, a = 3.75°, and the second laser is rotated at an equal angle by the scale 16, so that the second laser emitted by the laser range finder 13 and the laser instrument 18 (such as the blue line shown in Figure 2 ) has an included angle a and is marked with a line. Then the laser instrument 18 is turned at an angle a in turn, so that the two sets of laser range finders 13 are equally divided at an angle a. The inner side wall of the semicircular runner chamber is equally divided.

[0026] The circular arc laser positioning device 100 is moved to the inner side wall of the other semicircular runner chamber, and the two laser rays emitted by the two sets of laser range finders 13 are directed to the previous marks a and b, which are used as a reference for positioning. Then the above-mentioned actions are repeated to accurately divide the entire inner side wall of the runner chamber into the required equal parts.

[0027] Embodiment two: contains all the contents of embodiment one, the difference is: As shown in Figure 4 , the circular arc laser positioning device 100 includes a base plate 11, two sets of laser range finders 13, and two sets of telescopic rods 14. The two sets of laser range finders 13 are arranged vertically and installed on the base plate 11, so that the two lasers emitted by the two sets of laser range finders 13 have an included angle of 90°, and the reverse intersection points of the two lasers emitted by the two sets of laser range finders 13 converge at the edge of the base plate 11 (designated as point c); The bottom disc 11 is hollow inside, the light source 19 is arranged at point c inside the bottom disc 11, and the projection line groove 15 is uniformly arranged on the circumferential surface of the bottom disc 11.

[0028] Working principle: Mark the initial position a of equal division in the runner chamber, and attach point c of the edge of the bottom disc 11 to the inner wall a of the runner chamber, and keep the bottom disc 11 in a horizontal state, and the laser range finders 13 emit laser (such as the red line) to the inner side wall of the runner chamber and measure the distance, the laser range finders 13 are provided with digital display to measure the distance, the length of the telescopic rods 14 is adjusted, the movable end of the telescopic rod 14 is abutted to the inner side wall of the runner chamber, so that the posture of the bottom disc 11 is adjusted, until the laser distance emitted by the two laser range finders 13 is the same (and the calculated inner diameter is close to the average value of the inner diameter of the runner chamber), and the lines b and c are marked at the laser; Figure 4 At this time, the light source 19 inside the bottom disc 11 projects the projection light (equivalent to the second laser) to the outside through the projection line groove 15 between the marks b and c, and the projection light is uniformly marked on the wall of the runner chamber, so that the equal division of the inner side wall of the semicircular runner chamber is realized.

[0029] The above-described embodiments only express the specific implementation of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application.​

Claims

1. A wall bisecting method for runner chamber void detection, comprising a circular arc laser positioning device (100), characterized in that, The method comprises the following steps: The arc laser positioning device (100) is horizontally attached to the inner side wall of the runner chamber, and two first lasers are emitted from the arc laser positioning device (100) at the contact point as the center and perpendicular to each other; According to the laser ranging principle, the distance information of the two first lasers is obtained, and the posture of the arc laser positioning device (100) is adjusted so that the distances of the two first lasers are the same, and the space between the two first lasers as left and right boundaries is equally divided; A plurality of second lasers are emitted at equal angles from the center of the arc laser positioning device (100) to the first laser boundary, thereby achieving equal-distance division of the inner side wall of the half-circle runner chamber; The above steps are repeated to achieve equal-distance division of the inner side wall of the other half-circle runner chamber.

2. A wall bisecting method for runner chamber void detection according to claim 1, characterized in that, The arc laser positioning device (100) comprises a base plate (11) and a rotating disc (12) coaxially connected, and two groups of laser range finders (13) are installed on the rotating disc (12) to emit first lasers and form a 90° angle.

3. A wall bisecting method for runner chamber void detection according to claim 2, characterized in that, Telescopic rods (14) are arranged on opposite sides of the rotating disc (12).

4. The wall bisector method for runner cavity void detection of claim 2, wherein, A scale (16) is arranged on the base plate (11), and a laser instrument (18) is movably connected to the rotating disc (12) through an arc-shaped sliding block sliding rail (17), and the second laser emitted by the laser instrument (18) cooperates with the scale (16) to indicate the angle of the laser instrument (18) relative to the laser range finder (13).

5. The wall bisector method for runner cavity void detection of claim 2, wherein, The arc laser positioning device (100) is installed on a tripod.

6. A wall bisecting method for runner chamber void detection according to claim 2, characterized in that, A level is arranged on the base plate (11) and / or the rotating disc (12).

7. A wall bisecting method for runner chamber void detection according to claim 1, wherein The line connecting the intersection points of the two laser boundaries and the runner chamber wall is the inner diameter of the runner chamber, and the arc laser positioning device (100) emits two first lasers at different positions and different angles and calculates the inner diameter of the runner chamber and the average value.

8. A wall bisecting method for runner cavity void detection according to claim 1, wherein The arc laser positioning device (100) comprises a base plate (11), and two groups of laser range finders (13) are installed on the base plate (11) to emit first lasers and form a 90° angle; telescopic rods (14) are arranged on opposite sides of the base plate (11). The base plate (11) is hollow, and a light source (19) is arranged on the side wall of the inner cavity of the base plate (11), the light source (19) is located at the reverse intersection point of the two groups of laser range finders (13), and projection line grooves (15) are uniformly arranged on the circumferential side wall of the base plate (11).

Images