Flaw detector for control of internal surface of pipes (versions)

FIELD: physics, measurement.

SUBSTANCE: invention is related to controlling and measuring equipment. Flaw detector includes body that contains television camera and annular system of directed light radiation that consists of light diodes. Light reflector with mirror surface of concave cone shape is fixed to body on brackets. Rays of light coming from light diodes are reflected from mirror surface and are concentrated on internal surface of pipe in the form of narrow annular belt S. Signals coming to computer make it possible to define longitudinal dimensions of defects and coordinates of defects position in pipe length.

EFFECT: detection of defects such as minor burrs, including the ones of longitudinal direction, and definition of dimensions and locations of these burrs.

10 cl, 5 dwg, 1 tbl

 

The invention relates to measuring technique and can be used to detect defects such as irregularities on the inner surface of the pipe.

From the description of the patent specification EP 1457770, CL G01N 21/954, publ. 05.09.04 [1] known flaw detector for control of hollow bodies, comprising a television camera, a monitor, connected by a cable to a television camera, and the ring system of light emission, located concentric with the lens of the television camera.

Flaw detector [1] is not equipped with means of transportation along the cavity of the subject items and therefore cannot be effectively used to survey parts of great length, such as pipes.

From the description of the patent specification JP 2839934 B2 4036644 And CL G01N 21/88, publ. 24.12.98 [2] known flaw detector for monitoring the surface of the inner wall of the cylinder, comprising a casing mounted in the housing of the television camera, the drive movement of the housing along the hole of the target items, the system of light emission, the monitor associated with the television camera, and the light reflector cone with a mirrored surface that is attached to the housing at a distance from the television camera.

In operation, the detector [2] from the mirror surface of the reflector light on the subject of the cylindrical surface comes diffused luminous flux. Minor irregularities of the surface the surface (especially minor irregularities, elongated in the longitudinal direction) do not form a noticeable shadows and remain uncommitted on the monitor screen. Consequently, using the detector [2], it is impossible to detect such defects as mentioned above small longitudinal irregularities.

From the description of the patent specification JP 3591080 B2, 9089788 And CL G01N 21/88, publ. 17.11.04 [3] known flaw detector for monitoring internal surfaces of pipes, which includes placed inside the target tube chassis with a television camera, the ring system directional light emission and a conical reflector of light. The latter is attached to the housing at a distance from the television camera. The body of the instrument is equipped with a drive longitudinal movement in the bore of the pipe.

In operation, the detector [3] directional radiation beams of light, forming a truncated cone, fall on the pipe surface inclined to its axis. As a result, this surface is formed a wide ring light. This type of lighting allows to detect only large (mainly lateral) surface irregularities. Minor irregularities, especially irregularities aimed (elongated) along the pipe axis, remain uncommitted, because they do not form a noticeable shadows.

The technical result of the invention is to detect defects as small irregularities, including small irregularities longitudinally is about direction, on the inner surfaces of pipes and the sizes and locations of these irregularities.

This technical result is achieved in a flaw detector for monitoring internal surfaces of pipes, including the housing, the actuator longitudinal movement of the housing within the surveyed pipe installed in the housing of the television camera and the ring system directional light emission, concentrically covering the lens of the television camera, the monitor associated with the television camera, the light reflector attached to the housing at a distance from the television camera, and means for recording television signals and comparing them with the reference signals, with the mirror surface of the light reflector is formed by rotating the curve about the optical axis of the lens of the television camera and has a concave inside conical shape ensures the concentration of the reflected rays of light in the form of a narrow annular zone on the inner surface of the inspected pipe.

In the particular case of carrying out the invention, the mirror surface of the light reflector may be formed by the rotation about the optical axis of the lens of the television camera curve which is the graph of the function y=ax2+bx+C where the coefficients a and b and free member to depend on the radius R of the base of the mirror surface is rnost reflector and the distance L from the main plane of the lens of the television camera to the aforesaid grounds.

In another particular implementation of the invention, the mirror surface of the light reflector may be formed by the rotation about the optical axis of the lens of the television camera broken line consisting of straight line segments, each of which is tangent to the curve, which is the graph of the function y=ax2+bx+C where the coefficients a and b and free member to depend on the radius R of the base of the mirror surface of the reflector and the distance L from the main plane of the lens of the television camera to the aforesaid grounds.

In both these cases the ring system directional light radiation may consist of spaced around the circumference of the LEDs.

In both these cases the actuator longitudinal movement of the housing of the detector may be in the form of a hollow rod and mechanically associated motor, and a monitor and a means of recording television signals and comparing them with the reference signals may be associated with the television camera by means of a cable laid in the cavity of the said rod.

In both these cases the longitudinal displacement drive of the body can be associated with a means of recording television signals and comparing them with the reference signals with the possibility of defect sizing and places the x location along the length of the pipe. The invention is illustrated by the following drawings:

Figure 1 - scheme of the detector, General view;

Figure 2 is a view of forming the mirror surface of the reflector when it is a curve of the second order;

Figure 3 - the same, when forming is a polygonal line;

4 is a view of the reflector in the longitudinal section;

5 is a schematic image on the monitor screen as part of the internal surface of the pipe: a) reference tube and (b) a pipe having a recess on the inner surface.

The main part of the detector (figure 1) is case 1. The actuator longitudinal movement of the housing 1 within the surveyed pipe 2 may be made in the form of a hollow rod 3 and is mechanically associated motor 4. In case 1 flaw strictly on its axis mounted television camera 5. Concentric with respect to the lens 6 of the television camera 5 in the housing 1 there is a circular system of directional light emission, which may consist of located on a circle around the lens 6 and equidistant from each other LEDs 7. Use as light sources LEDs can reduce the cost of system design light emission and facilitates control of the luminous flux. Outside of the inspected pipes 2 are the monitor 8 and a means of recording television signals and compared the I these signals with the reference signals, which may be made in the form of computer 9.

The television camera 5 is connected to the monitor 8 and the computer 9 cable 10. These nodes constitute a television system of the instrument. The cable 10 may be laid in the cavity of the hollow rod 3. The execution of the hollow rod not only reduces the intensity of the device, but also increases reliability, because the placement of the cable 10 in the cavity protects it from damage.

To the body 1 of the instrument at a distance L from the main plane of the lens 6 of the television camera 5 on the brackets 11 attached to the light reflector 12, the mirror surface 13 which is formed by rotating the curve about the optical axis of the lens 6 of the television camera 5 and has a concave inside conical shape (in other words, the mirror surface 13 has the form of a cone, facing the top of the camera, with the concave inside of the sides). The geometric axis of the light reflector 12 coincides with the optical axis of the lens 6 of the television camera 5.

Mirror surface 13 of the light reflector 12 may be, in the particular case of carrying out the invention, formed by the rotation curve of the second order with respect to the optical axis of the lens 6 of the television camera 5 (see figure 2). Mentioned conic curve is the graph of the function y=ax2+bx+c where the coefficients a and b and free member to depend on the radius is R the Foundation of the mirror surface 13 of the light reflector 12 and the distance L from the main plane of the lens 6 of the television camera 5 to the base of the mirror surface.

In another particular implementation of the invention forming the mirror surface 13 of the light reflector 12 can be represented as a broken line (i.e. piecewise linear curve), consisting of straight line segments (see figure 3). Each of these segments is tangent to the curve y=ax2+bx+c in one of its points. In this case, the mirror surface 13, the resulting rotation of the polyline consists of a number adjacent to each other truncated cones. Reflectors with such a shape of the reflective surface is cheaper and easier to manufacture than a reflector with a reflective surface obtained by rotating a smooth curve.

4 shows a longitudinal section of a light reflector 12, the mirror surface 13 which is built using the generatrix defined by the formula y=ax2+bx+c. In the attached table presents the results of calculations using this formula with respect to the inspection of tubes with an inner diameter of 62 mm

Part of the means of recording television signals and comparing them with the reference signals includes a memory block and block a decision on the rejection of the pipe. In the memory unit stores the received cable 10 from the television camera 5 and converted into digital form signals of the images of the reference tubes of various sizes. As the reference is selected Tr who would defect-free inner surface, having the exact nominal size inner diameters. Associated with the memory block block a decision on the rejection of the pipes can compare the signals received from the television camera 5 in the survey process pipe, according to the values of the reference signals and to decide on the rejection of the pipe. Block a decision on the rejection of the pipe can be connected with remote control sound and/or light signal. This unit can also be connected to the actuators of the devices performing the removal of defective pipes of the total process stream.

In the above cases, the actuator longitudinal movement of the housing 1 can be associated with a means of recording television signals and comparing them with the reference signals to determine the defect size and location along the pipe.

The signals characterizing the longitudinal movement of the hollow rod 3 from the housing 1 into the pipe 2, may enroll in the computer 9 from a tachometer (not shown), which is connected with the motor 4, or directly from the friction roller 14, is pressed against the outer surface of the hollow rod 3. The superposition of these signals to signals from the television camera 5, provides an opportunity to identify and accurately record the longitudinal dimensions of the defects and their location along the pipe.

Pre the proposed invention is used as follows. The detector may be installed in a production line or plumbing repairs. The end of the target tube 2 is placed in front of the television camera 5, and the geometrical axis of the tube 2 should be aligned with the optical axis of the lens 6 of the television camera 5. By means of a hollow rod 3 case 1 with the television camera 5, a system of directional light emission and the light reflector 12 is injected into the pipe 2. Include television system, the ring system directional light emission, and using longitudinal displacement drive of the promoting body 1 to the opposite end of the pipe 2. In the process of moving body 1 in the pipe 2 rays ring-directional light radiation reflecting mirror surface 13 of the light reflector 12, successively fall on different parts of the inner surface of the pipe 2. The shape of the mirror surface 13 of the light reflector 12 and its position relative to the light source provides the concentration of rays in a narrow annular zone's internal surface of the pipe 2 (see figure 1). Because of this concentration generated by the television camera 5, the signals entering the monitor 8 via the cable 10, is accurately reproduced on the screen of the monitor 8, the contour of the inner wall of the tube 2 in the form of a narrow light ring W (see figa and 5B). Doing in the computer 9, the television signal pre is prasouda in digital form and compared with the reference signals. Based on the results of comparing the newly received and reference signals, the computer 9 of the decision on the compliance of the pipe 2 with the established quality standards. In case of violation of the norms of quality of the unit of decision-making forms wypracowanie signal sent to the monitor screen 8 and the remote control process stream.

In accordance with this description was made a prototype of the instrument, by which the production conditions were examined in total, 950 tubing length 10 m and an outer diameter of 73 mm, with a wall thickness of 5.5 mm, the Experience showed the possibility of detecting irregularities on the inner surface of the pipe size from 0.7 mm and detecting deviations of the internal diameters of the pipes from the nominal values from 2 mm.

Names of parts and components

1. The body of the instrument.

2. The subject pipe.

3. Hollow rod.

4. The electric motor.

5. Television camera.

6. The lens of the television camera.

7. LEDs are directional light radiation.

8. Monitor.

9. Computer.

10. Cable.

11. The mounting bracket reflector of light.

12. Reflector light.

13. The mirror surface reflecting the light.

14. The friction roller.

The technical result of the invention is to detect defects as small irregularities, which including small unevenness in the longitudinal direction, on the inner surfaces of pipes and the sizes and locations of these irregularities.

Table
The results of calculation of coordinates of points of the curve y=ax2+bx+c
X mmY-mm
01,65
12,02
22,39
32,78
43,18
53,6
64,03
74,47
8is 4.93
9of 5.4
10of 5.89
116,4
126,92
137,46
148,03
158,62
169,23
179,86
1810,52
1911,22
2011,94
2112,71
2213,51
2314,37
2415,27
2516,24
26the 17.3
2718,44
28of 19.72
2921,18
3022,91
3125,2

1. Flaw detector for monitoring internal surfaces of pipes, including the housing, the actuator longitudinal movement of the housing within the surveyed pipe installed in the housing of the television camera and the ring system is it directional light emission, concentrically covering the lens of the television camera, the monitor associated with the television camera, the light reflector attached to the housing, means for recording television signals and comparing them with the reference signals, with the geometric axis of the reflector of the light coincides with the optical axis of the lens of the television camera, and the mirror surface of the light reflector is formed by rotating a curve about the optical axis of the lens of the television camera and has a concave inside of the reflector conical shape, and the shape of the mirror surface of the reflector and its position relative to the system light emitting ensure the concentration of the reflected rays of light in the form of a narrow annular zone on the inner surface of the inspected pipe.

2. The flaw detector according to claim 1, characterized in that the mirror surface of the light reflector having a base, formed by rotating a curve which is the graph of the function y=ax2+bx+C where the coefficients a and b and the free member depend on the size of the radius R of the base of the reflector and the distance L from the main plane of the lens of the television camera to the aforesaid grounds.

3. The flaw detector according to claim 1 or 2, characterized in that the ring system of directional light emission consists of spaced around the circumference of the LEDs.

4. defectoscopy according to any one of claims 1 or 2, characterized in that the longitudinal displacement drive of the body of the instrument is made in the form of a hollow rod and mechanically associated motor, and a monitor and a means of recording television signals and comparing them with the reference signals associated with the television camera by means of a cable laid in the cavity of the said rod.

5. The flaw detector according to any one of claims 1 or 2, characterized in that the longitudinal displacement drive of the body is associated with a means of recording television signals and comparing them with the reference signals to determine defect size and location along the pipe.

6. Flaw detector for monitoring internal surfaces of pipes, including the housing, the actuator longitudinal movement of the housing within the surveyed pipe installed in the housing of the television camera and the ring system directional light emission, concentrically covering the lens of the television camera, the monitor associated with the television camera, the light reflector attached to the housing, means for recording television signals and comparing them with the reference signals, with the geometric axis of the reflector of the light coincides with the optical axis of the lens of the television camera, and the mirror surface of the light reflector formed by the rotation about the optical axis of the lens broken l the Institute, consisting of straight line segments, and has a concave inside of the reflector conical shape, and the shape of the mirror surface of the reflector and its position relative to the system light emitting ensure the concentration of the reflected rays of light in the form of a narrow annular zone on the inner surface of the inspected pipe.

7. The flaw detector according to claim 6, characterized in that the mirror surface of the light reflector having a base, formed by rotation of a broken line consisting of straight line segments, each of which is tangent to the curve, which is the graph of the function y=ax2+bx+C where the coefficients a and b and the free member depend on the size of the radius R of the base of the reflector and the distance L from the main plane of the lens of the television camera to the aforesaid grounds.

8. The flaw detector according to any one of p or 7, characterized in that the ring system of directional light emission consists of spaced around the circumference of the LEDs.

9. The flaw detector according to any one of p or 7, characterized in that the longitudinal displacement drive of the body of the instrument is made in the form of a hollow rod and mechanically associated motor, and a monitor and a means of recording television signals and comparing them with the reference signals associated with the television camera via cable, Strait is built into the cavity of the said rod.

10. The flaw detector according to any one of p or 7, characterized in that the longitudinal displacement drive of the body is associated with a means of recording television signals and comparing them with the reference signals to determine defect size and location along the pipe.



 

Same patents:

FIELD: investigating or analyzing materials by the use of optical means.

SUBSTANCE: device comprises endoscope of side vision with measuring scale that is secured in the central flange provided with circular scale. The flange is set in the bushing at the outlet face of the space for permitting rotation of the flange together with the endoscope whose lens is mounted at the center of the space. The axis of sighting is positioned in the zone of ring weld joint that connects hemispheres of the space. The device is additionally provided with flexible passage for lightening internal surface of the space by flat laser beam under various angles. The passage for laser illumination is composed of semiconducting micro-laser mounted at the axis of gradient lens that is mounted at the outlet face of the light guide coincident with the back focus, second gradient lens mounted at the outlet face of the light guide, cylindrical lens, spherical lens, and flat mirror.

EFFECT: expanded functional capabilities.

5 dwg

FIELD: non-destructive inspection.

SUBSTANCE: device has standard side-view endoscope, which has system for illuminating object and system for observing object provided with measuring scale. Device is additionally provided with bushing having linear and angular scales, which bushing is capable of translation and rotation about axis of symmetry of flange fastened to input opening of cavity to be controlled. Tube with optical system for laser illumination of object is mounted inside bushing; tube has microscopic laser and mirror. Tube is mounted in bushing for linear movement relatively endoscope in parallel to its longitudinal axis. Precision of measurement of sizes of objects disposed at long distances to surfaces to be controlled is improved. Measurement of coordinates of defect location on surfaces of object can be made with higher precision.

EFFECT: improved precision of measurement.

3 dwg

FIELD: measurement engineering.

SUBSTANCE: odometer for intratube gear-flaw detector, which odometer is fastened to air-tight container of flaw detector, has electronic unit, light source, optical fiber provided with image forming system. Electronic unit, light source in form of IR radiation range LED and image forming system in form of fiber-optic bundle, couplers and CCD array are built hermetically inside resilient polyurethane base fastened from outside to air-tight container. Electronic unit has also CCD array controller to process information based on algorithms of calculation of distance. IR radiation range LED is connected with control output of controller through switch-transistor. Control input and video output of CCD array are connected with controller by means of serial terminal.

EFFECT: improved precision of measurement.

4 dwg

FIELD: measurement engineering.

SUBSTANCE: odometer for intratube gear-flaw detector, which odometer is fastened to air-tight container of flaw detector, has electronic unit, light source, optical fiber provided with image forming system. Electronic unit, light source in form of IR radiation range LED and image forming system in form of fiber-optic bundle, couplers and CCD array are built hermetically inside resilient polyurethane base fastened from outside to air-tight container. Electronic unit has also CCD array controller to process information based on algorithms of calculation of distance. IR radiation range LED is connected with control output of controller through switch-transistor. Control input and video output of CCD array are connected with controller by means of serial terminal.

EFFECT: improved precision of measurement.

4 dwg

FIELD: non-destructive inspection.

SUBSTANCE: device has standard side-view endoscope, which has system for illuminating object and system for observing object provided with measuring scale. Device is additionally provided with bushing having linear and angular scales, which bushing is capable of translation and rotation about axis of symmetry of flange fastened to input opening of cavity to be controlled. Tube with optical system for laser illumination of object is mounted inside bushing; tube has microscopic laser and mirror. Tube is mounted in bushing for linear movement relatively endoscope in parallel to its longitudinal axis. Precision of measurement of sizes of objects disposed at long distances to surfaces to be controlled is improved. Measurement of coordinates of defect location on surfaces of object can be made with higher precision.

EFFECT: improved precision of measurement.

3 dwg

FIELD: investigating or analyzing materials by the use of optical means.

SUBSTANCE: device comprises endoscope of side vision with measuring scale that is secured in the central flange provided with circular scale. The flange is set in the bushing at the outlet face of the space for permitting rotation of the flange together with the endoscope whose lens is mounted at the center of the space. The axis of sighting is positioned in the zone of ring weld joint that connects hemispheres of the space. The device is additionally provided with flexible passage for lightening internal surface of the space by flat laser beam under various angles. The passage for laser illumination is composed of semiconducting micro-laser mounted at the axis of gradient lens that is mounted at the outlet face of the light guide coincident with the back focus, second gradient lens mounted at the outlet face of the light guide, cylindrical lens, spherical lens, and flat mirror.

EFFECT: expanded functional capabilities.

5 dwg

FIELD: physics, measurement.

SUBSTANCE: invention is related to controlling and measuring equipment. Flaw detector includes body that contains television camera and annular system of directed light radiation that consists of light diodes. Light reflector with mirror surface of concave cone shape is fixed to body on brackets. Rays of light coming from light diodes are reflected from mirror surface and are concentrated on internal surface of pipe in the form of narrow annular belt S. Signals coming to computer make it possible to define longitudinal dimensions of defects and coordinates of defects position in pipe length.

EFFECT: detection of defects such as minor burrs, including the ones of longitudinal direction, and definition of dimensions and locations of these burrs.

10 cl, 5 dwg, 1 tbl

FIELD: instrument engineering.

SUBSTANCE: endoscope with deflected remote visual image consists of a rigid tube containing lighting means and observation means, the distal end of tube of which includes deflecting prisms, as well as light guidance means and image transmission means. Two deflecting prisms of lighting means and observation means are located near each other and oriented with the possibility of deflecting lighting beam supplied by guidance means in the direction which is essentially parallel to observation axis of prism of observation means. As per the second version, two deflecting prisms are located in the tube near each other so that lighting axis of deflecting prism of lighting means and observation axis of deflecting prism of observation means basically converge. Between two prisms there installed is a shield resistant to ultraviolet radiation.

EFFECT: designing compact and easy-to-use endoscope with ultraviolet lighting, which prevents trapping of parasite light by observation means.

12 cl, 4 dwg

FIELD: physics.

SUBSTANCE: apparatus for detecting contamination on at least a partially transparent substrate includes an electromagnetic radiation source (2) and receiver (1), as well as a holder (4) for the curved substrate. The holder (4) is placed such that the curved substrate it holds passes between the radiation source (2) and receiver (1) on at least separate areas. The substrate holder (4) is adapted to attach a substrate, essentially having the shape of a hollow cylinder, and is placed such that the radiation source or receiver (1) lies inside the substrate, having the shape of a hollow cylinder, during operation of the apparatus. The radiation receiver is horizontal and the source (2) is a source of electromagnetic radiation in the wavelength range from 350 to 500 nm.

EFFECT: possibility of analysing an area on the surface of a curved substrate with small angular length, which enables to ignore curvature of that area.

12 cl, 2 dwg

FIELD: measurement equipment.

SUBSTANCE: device 2 for display of an inner surface 4 of a cavity in a part 6 comprises optics 8 with circular scan, which is located in the image-transmitting connection with a shooting device (10) and a processing device installed behind. The device also comprises a lighting device 16 with a source of light 18 to illuminate the displayed area of the inner surface 4 covered with the optics 8. Location of the lighting device 16 relative to the optics 8 and trajectory of its beams is selected so that the first axial section of the displayed area may be illuminated in the light field, and the second axial section of the displayed area simultaneously distant from the first axial section - in the dark field.

EFFECT: provision of the possibility to detect structural defects of surface.

15 cl, 11 dwg

FIELD: measurement equipment.

SUBSTANCE: device comprises a camera, a projector and a computer connected to each other with a controller installed onto a platform. The camera and the projector are installed on the site capable of rotation by means of a step electric motor connected to the controller. The camera is capable of making rotary movements due to the step electric motor installed onto the site and connected to the controller. The site is connected with the platform capable of making reciprocal movements inside the pipeline by means of an electric drive with wheels connected with the controller. The stability of the position and protection against mechanical damage is provided by the system of levers and wheels, attached to the platform, power supply and autonomy of operation is provided by an accumulator battery installed onto the platform. Motion control is carried out via radio control through a controller that receives signals from a computer located outside the pipeline.

EFFECT: increased accuracy of measurement of geometric imperfections of a wall in manifold pipelines.

4 dwg

FIELD: power industry.

SUBSTANCE: invention relates to automated methods of assemblies or elements identification, mainly used to store and to transport the spent fuel assemblies, in particular ampoules, in which bunch of fuel elements of spent fuel assembly of RBMK-1000 reactor are loaded. Image of internal part of the ampoule lid is supplied to the matrix recorder, automatic search of hole images, data mathematic processing relating searched hole images are performed, during processing the position of the initial mark is determined, and position of signs "1" are restored, other positions of code sequence will be occupied with signs "0", thus marking identification is performed.

EFFECT: increased reliability of automatic recognition of the identification marking of ampoules with spent nuclear fuel, made in form n-bit code, which symbols are through holes in side surface of the ampoule lid.

9 cl, 9 dwg

Up!