CN109539995B - Automatic measuring device for creepage distance of insulator - Google Patents
Automatic measuring device for creepage distance of insulator Download PDFInfo
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- CN109539995B CN109539995B CN201811376487.8A CN201811376487A CN109539995B CN 109539995 B CN109539995 B CN 109539995B CN 201811376487 A CN201811376487 A CN 201811376487A CN 109539995 B CN109539995 B CN 109539995B
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/022—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by means of tv-camera scanning
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Abstract
The invention discloses an automatic measuring device for the creepage distance of an insulator, which solves the problems that the existing manual mode for measuring the creepage distance of the insulator is low in efficiency, high in labor intensity and high in error, and the automatic measuring method is only used for measuring by the acquired contour information of the insulator, so that the measurement is not accurate. The device comprises a support and a calibration and calibration system, wherein the calibration and calibration system is used for calibrating the position of a measuring unit before measurement begins; the support adopts an L-shaped support and is used for forming a frame of the integral detection device, a horizontal guide rail support is arranged at the top of a long side frame of the L-shaped support, a horizontal moving guide rail is arranged on the horizontal guide rail support, and a sample hanging and fixing device is arranged on the horizontal moving guide rail; install the lead screw in the vertical direction of perpendicular support, be provided with the detecting element mounting bracket between the bracing piece about the L type support minor face frame, be provided with on the detecting element mounting bracket and adjust the industrial camera mount pad, be provided with on the perpendicular laser head support and adjust the laser head mount pad.
Description
Technical Field
The invention relates to the technical field of insulator creepage distance, in particular to an automatic measuring device for the creepage distance of an insulator.
Background
The insulator product creep distance refers to the total length of a curve along the outer surface of the insulator insulating part. The creep distance is an important parameter for determining the performance of the insulator during the production, manufacture and use of the insulator. In order to ensure the reliable performance of the product, whether the product leaves a factory or is accepted by a user, various size parameters including the creep distance of the insulator product need to be sampled and detected so as to confirm the product quality and ensure the operation reliability.
At present, the creep distance measuring method used in the actual production mostly adopts a manual method, and a method for measuring the total length by using a straightening adhesive tape after the adhesive tape is pasted along the surface of an insulator is used. The method has the disadvantages of low measuring efficiency and poor measuring precision. The measurement result is easily interfered by human factors and the like; however, the conventional automatic measurement method only adopts a mechatronic device to control a point-emitting laser range finder to scan along the axial direction of the insulator so as to obtain the creep distance parameter, but the conventional automatic measurement method has the problems that the creep distance start point and the creep distance end point cannot be defined, the measurement of the insulator with a complex shape is difficult due to structural shielding, and the like, and is difficult to apply in practice. Therefore, the invention provides a measuring device for rapidly and accurately measuring the creepage distance of an insulator product by laser three-dimensional scanning based on a photoelectric technology.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the conventional manual mode for measuring the creepage distance of the insulator is low in efficiency, high in labor intensity and high in error, and the automatic measuring method is only used for measuring the creepage distance by using the acquired outline information of the insulator, so that the creepage distance starting point and the creepage distance ending point cannot be defined, and the problem that the measurement of the complicated-shape insulator is difficult due to the shielding of the structure exists.
The invention is realized by the following technical scheme:
an automatic measuring device for the creepage distance of an insulator comprises a bracket and a calibration and calibration system, wherein the calibration and calibration system is a specially-made black and white checkerboard and is used for calibrating the position of a measuring unit before measurement begins;
the support adopts an L-shaped support and is used for forming a frame of the integral detection device, and the L-shaped support comprises an L-shaped support long side frame, an L-shaped support short side frame and a vertical laser head support at the junction of the L-shaped support long side frame and the L-shaped support short side frame;
the long side frame of the L-shaped support comprises a horizontal guide rail support and a vertical support, the top of the long side frame of the L-shaped support is provided with the horizontal guide rail support, the horizontal guide rail support is provided with a horizontal moving guide rail, the horizontal moving guide rail is provided with a test article hanging and fixing device, and the test article hanging and fixing device is used for hanging a test article insulator; a screw rod is arranged in the vertical direction of the vertical support, and the screw rod is connected with the horizontal guide rail support and drives the horizontal guide rail support to move in the vertical direction;
a detection unit mounting frame is arranged between the upper support rod and the lower support rod of the L-shaped support short edge frame, an industrial camera adjusting mounting seat is arranged on the detection unit mounting frame, and the industrial camera adjusting mounting seat is used for mounting an industrial camera;
be provided with on the perpendicular laser head support and adjust the laser head mount pad, it is used for installing the laser head to adjust the laser head mount pad.
The principle of the scheme of the invention is as follows: according to the scheme, firstly, an L-shaped support is installed, then a plurality of laser heads are installed on adjusting laser head installation seats of vertical laser head supports on two sides of an intersecting upright post side of an L-shaped support frame along a specific straight line or an arc line, a measuring unit formed by an industrial camera is installed on an adjusting industrial camera installation seat of a short side frame of the L-shaped support frame along the arc line or the straight line, a test article insulator is hung on a test article hanging and fixing device, and the number, the installation position and the detection angle of the laser heads and the industrial camera can be adjusted according to the type of a detected test article; moreover, the vertical height position of the test insulator is adjusted through the lead screw, and the positions of each laser head and each industrial camera are adjusted in a combined manner, so that the shooting effect of each laser head and each industrial camera for the test insulator is in an excellent position; then, linear lasers generated by the plurality of linear array laser heads irradiate the surface of the insulator of the test object, a plurality of industrial cameras calibrated by a standard checkerboard of the calibration system respectively shoot the lasers of the linear laser arrays irradiating the surface of the insulator at different positions and angles, measurement is realized according to a subsequent insulator creepage distance measuring method, and the length of the linear beams on the surface of the insulator is calculated; and finally, manually positioning in a visible light picture shot by a camera, and determining the initial and final positions of the creepage distance measurement so as to obtain the creepage distance.
Further, still include the lead screw hand wheel, the lead screw hand wheel set up in the lead screw top, the lead screw hand wheel is connected the lead screw, through rocking the lead screw hand wheel drives the lead screw motion, the manual regulation of the initial sample insulator's behind the measuring device position height after the easy to assemble.
Furthermore, the electric connection box is arranged at the bottom of the support, the adjusting laser head mounting seat, the sample hanging and fixing device and the adjusting industrial camera mounting seat are connected into the electric connection box through wires, and analysis processing and calculation after measurement data of a sample insulator are connected into a background computer behind the electric connection box are facilitated.
Furthermore, the test article hanging and fixing device horizontally and freely slides along the horizontal moving guide rail, and a locking device is arranged on the test article hanging and fixing device, so that the transverse sliding of a test article insulator hung on the test article hanging and fixing device is avoided, and the measuring accuracy is ensured.
Furthermore, the detection unit mounting frame adopts an arc-shaped or bent frame, so that the angle and the direction of the industrial camera can be conveniently adjusted.
Further, the idler wheel is installed at the bottom of the support, the brake device is arranged on the idler wheel, the idler wheel is convenient to move, and the brake device prevents the idler wheel from slipping on the ground.
The invention has the following advantages and beneficial effects:
1. according to the invention, the automatic measurement of the creepage distances of different types of insulators is realized, the measurement process can be completed at one time after one-time clamping, the repeated test article carrying and clamping process in the traditional manual measurement is avoided, the detection precision is improved, the labor intensity in the insulator detection test is greatly reduced, and the measurement efficiency is improved;
2. in the process of measuring the creepage distance of the insulator, no measuring element or tested object moves, so that errors caused by various dynamic processes can be completely avoided;
3. the method for manually marking the starting and ending positions of the creepage distance can completely avoid the measurement error caused by the difference between the effective creepage distance and the surface length of the test sample due to the difference of the production process level of the insulator;
4. the creepage distance measurement is non-contact measurement, and no damage is caused to a test article;
5. the testing device has extremely high efficiency of detecting the creep distance of the same type of test products after completing calibration, only three stages of test product suspension, measurement and test product removal are needed for the required detection time, wherein the time consumed in the measurement stage can be easily controlled within seconds; the suspension and the removal of the test sample can be controlled within ten seconds due to the fact that the measuring device adopts an open structure which is convenient to operate; compared with the conventional manual detection which takes several minutes, the time consumption is greatly increased.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural view of an automatic measuring device for the creepage distance of an insulator according to the present invention.
Fig. 2 is a schematic structural view of the automatic measuring method for the creepage distance of the insulator of the present invention.
FIG. 3 is a schematic view of laser plane calibration in the automatic measuring method for the creepage distance of the insulator of the present invention.
Fig. 4 is a calibration flow chart of the automatic insulator creepage distance measuring method system of the present invention.
Fig. 5 is a flow chart of the automatic measuring method of the creepage distance of the insulator of the present invention.
Reference numbers and corresponding part names in the drawings:
1-horizontal moving guide rail, 2-vertical laser head bracket, 3-L type bracket long side frame, 4-screw rod, 5-horizontal guide rail bracket, 6-adjusting laser head mounting seat, 7-detection unit mounting seat, 8-sample hanging and fixing device, 9-electric junction box, 10-vertical bracket, 11-screw rod hand wheel, 12-adjusting industrial camera mounting seat, 13-L type bracket short side frame and 14-roller.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
As shown in fig. 1, an automatic measuring device for the creepage distance of an insulator comprises a bracket and a calibration and calibration system, wherein the calibration and calibration system is a specially-made black-and-white checkerboard and is used for calibrating the position of a measuring unit before measurement is started and works through the calibration and calibration system which is externally connected with a computer terminal through an electric junction box 9; the support adopts an L-shaped support and is used for forming a frame of the integral detection device, and the L-shaped support comprises an L-shaped support long side frame 3, an L-shaped support short side frame 13 and a vertical laser head support 2 at the junction of the L-shaped support long side frame 3 and the L-shaped support short side frame 13; the L-shaped support long side frame 3 comprises a horizontal guide rail support 5 and a vertical support 10, the horizontal guide rail support 5 is movably mounted at the top of the L-shaped support long side frame 3 in a screw connection mode, a horizontal moving guide rail 1 is arranged on the horizontal guide rail support 5, a test article hanging and fixing device 8 is mounted on the horizontal moving guide rail 1, the test article hanging and fixing device 8 is a small platform moving along the horizontal direction of the horizontal moving guide rail 1, and the test article hanging and fixing device 8 is used for hanging a test article insulator; a screw rod 4 is arranged in the vertical direction of the vertical support 10, and the screw rod 4 is connected with the horizontal guide rail support 5 and drives the horizontal guide rail support 5 to move in the vertical direction; a detection unit mounting frame 7 is arranged between the upper supporting rod and the lower supporting rod of the L-shaped support short side frame 13, an industrial camera adjusting mounting seat 12 is arranged on the detection unit mounting frame 7, and the industrial camera adjusting mounting seat 12 is used for mounting an industrial camera; an adjusting laser head mounting seat 6 is arranged on the vertical laser head support 2, the adjusting laser head mounting seat 6 is used for mounting a laser head, wherein an industrial camera is clamped on an adjusting industrial camera mounting seat 12, and the laser head is directly clamped on the adjusting laser head mounting seat 6;
in this embodiment, still include lead screw hand wheel 11, lead screw hand wheel 11 set up in 4 tops of lead screw, lead screw hand wheel 11 is connected lead screw 4, through rocking lead screw hand wheel 11 drives lead screw 4 moves, the manual regulation of the initial sample insulator's behind the measuring device behind the easy to assemble position height.
Still include electric terminal box 9, electric terminal box 9 set up in the support bottom, adjust laser head mount pad 6 the sample hangs fixing device 8, adjusts industry camera mount pad 12 and all inserts through the wire in the electric terminal box 9, make things convenient for the analysis processes and the calculation after the measurement data of carrying out the sample insulator of back-end computer of inserting behind the electric terminal box 9.
The test article hanging and fixing device 8 horizontally and freely slides along the horizontally moving guide rail 1, and a locking device is arranged on the test article hanging and fixing device 8, so that the transverse sliding of a test article insulator hung on the test article hanging and fixing device 8 is avoided, and the measuring accuracy is ensured.
The detection unit mounting frame 7 adopts an arc-shaped or bent frame, so that the angle and the direction of the industrial camera can be conveniently adjusted.
The bottom of the bracket is provided with a roller 14, and the roller 14 is provided with a braking device, so that the roller 14 is convenient to move, and the braking device prevents the roller 14 from slipping on the ground.
As shown in fig. 2 to 5, after the insulator creepage distance automatic measuring device is used for data shooting of the insulator, the following insulator creepage distance measuring method is used for subsequent calculation of creepage distance, and the method comprises the following steps:
s1: acquiring image information of the insulator to be measured by using a laser head and an industrial camera of the automatic measuring device for the creepage distance of the insulator;
s2: extracting the insulator laser line outline pixel information in the insulator image information to be measured acquired in the step S1;
s3: based on the calibration information of the calibration analysis of the measurement system, calculating the insulator laser contour pixel information obtained in the step S2 to physical coordinates, wherein the step of the calibration information of the calibration analysis of the measurement system comprises the following steps:
s31: acquiring a checkerboard which is shot synchronously by each measuring unit as calibration data;
s32: acquiring corner information of the checkerboard according to the calibration data acquired in the step S31, and acquiring the relation between the physical coordinates and the pixel coordinates in the plane of the insulator sub-image by fitting a fourth-order polynomial according to the corresponding relation between the pixel coordinates and the physical coordinates of the corner of the checkerboard;
s4: splicing the analyzed physical coordinate information of the insulator laser profiles of the measuring units according to the step S3 and removing profile noise;
s5: and (4) acquiring a complete insulator contour curve according to the step S4, and performing accumulation integration on the insulator contour in a calculation range to further obtain the creepage distance of the insulator.
Step S1, acquiring the image information of the insulator to be measured by adopting a three-dimensional laser scanning mode; the three-dimensional laser is obtained by adopting a plurality of linear laser heads as laser scanning elements and simultaneously adopting a plurality of visible light cameras separated from the laser heads as measuring elements to realize the measurement of the creepage distance of the insulator to be measured; the effective length of the creepage distance is marked by manually setting a creepage distance starting measurement position and a creepage distance ending measurement position in the visible light image shot by the visible light camera.
Before obtaining the calibration data of the measurement units in step S31, the calibration hardware system needs to be adjusted so that the laser lines of the measurement units can be in one plane, and a checkerboard is placed on the laser plane; the calibration data obtained in step S32 is used to obtain the corner information of the checkerboard, which may be obtained by using an OpenCV related calibration function library; in step S32, a relationship between a physical coordinate and a pixel coordinate in the insulator image plane is obtained by fitting, where the fourth-order polynomial is:
F(x)＝a0u4+a1v4+a2u3v+a3u2v2+a4uv3+a5u3+a6v3+a7u2v
+a8uv2+a9u2+a10v2+a11uv+a12u+a13u+a14
F(y)＝b0u4+b1v4+b2u3v+b3u2v2+b4uv3+b5u3+b6v3+b7u2v
+b8uv2+b 9 u2+b10v2+b11uv+b12u+b13v+b14
wherein F (x), F (y) are the physical horizontal and vertical coordinate values, respectively, a0～a14、b0～b14Are the corresponding polynomial fit coefficients, u, v are the corresponding pixel coordinate values.
When the device is used, firstly, the L-shaped support is installed, then a plurality of laser heads are installed on the adjusting laser head installation seats 6 of the vertical laser head supports 2 on the sides of the intersecting columns at the two sides of the L-shaped support frame along specific straight lines or arc lines, a measuring unit formed by an industrial camera is installed on the adjusting industrial camera installation seats 12 of the short side frame of the L-shaped support frame along the arc lines or the straight lines, a test article insulator is hung on the test article hanging and fixing device 8, and the number, the installation position and the detection angle of the laser heads and the industrial camera can be adjusted according to the type of the detected test article; moreover, the vertical height position of the test insulator is adjusted through the screw rod 4, and the positions of each laser head and each industrial camera are adjusted in a combined manner, so that the shooting effect of each laser head and each industrial camera for the test insulator is in an excellent position; then, linear lasers generated by the plurality of linear array laser heads irradiate the surface of the insulator of the test object, a plurality of industrial cameras calibrated by a standard checkerboard of the calibration system respectively shoot the lasers of the linear laser arrays irradiating the surface of the insulator at different positions and angles, measurement is realized according to the method for measuring the creepage distance of the edge, and the length of the linear beams on the surface of the insulator is calculated; and finally, manually positioning in a visible light picture shot by a camera, and determining the initial and final positions of the creepage distance measurement so as to obtain the creepage distance.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The utility model provides an insulator creepage distance automatic measuring device, includes the support, its characterized in that: the calibration system is a specially-made black and white checkerboard and is used for calibrating the position of the measurement unit before measurement starts;
the support adopts an L-shaped support and is used for forming a frame of the integral detection device, and the L-shaped support comprises an L-shaped support long side frame (3), an L-shaped support short side frame (13) and a vertical laser head support (2) at the junction of the L-shaped support long side frame (3) and the L-shaped support short side frame (13);
the L-shaped support long side frame (3) comprises a horizontal guide rail support (5) and a vertical support (10), the horizontal guide rail support (5) is installed at the top of the L-shaped support long side frame (3), a horizontal moving guide rail (1) is arranged on the horizontal guide rail support (5), a test article hanging and fixing device (8) is installed on the horizontal moving guide rail (1), and the test article hanging and fixing device (8) is used for hanging a test article insulator; a screw rod (4) is installed on the vertical support (10) in the vertical direction, and the screw rod (4) is connected with the horizontal guide rail support (5) and drives the horizontal guide rail support (5) to move in the vertical direction;
a detection unit mounting frame (7) is arranged between an upper supporting rod and a lower supporting rod of the L-shaped support short side frame (13), an industrial camera adjusting mounting seat (12) is arranged on the detection unit mounting frame (7), and the industrial camera adjusting mounting seat (12) is used for mounting an industrial camera;
an adjusting laser head mounting seat (6) is arranged on the vertical laser head support (2), and the adjusting laser head mounting seat (6) is used for mounting a laser head;
the device further comprises a creepage distance calculating device which executes the following processes:
acquiring image information of the insulator to be measured by using a laser head and an industrial camera of the automatic measuring device for the creepage distance of the insulator;
extracting insulator laser line outline pixel information in the acquired insulator image information to be measured;
calibrating and analyzing calibration information based on a measurement system, and calculating the obtained insulator laser contour pixel information to physical coordinates;
splicing according to the physical coordinate information of the insulator laser profiles of the measuring units obtained by analysis and removing profile noise; and
accumulating and integrating the contour of the insulator within a calculation range according to the obtained complete contour curve of the insulator, and further obtaining the creepage distance of the insulator;
the process of calibrating and analyzing the calibration information by the measuring system is as follows:
acquiring a checkerboard which is shot synchronously by each measuring unit as calibration data;
acquiring corner information of the checkerboard according to the acquired calibration data, and fitting by using a fourth-order polynomial according to the corresponding relation between the corner pixel coordinate and the physical coordinate of the checkerboard to acquire the relation between the physical coordinate and the pixel coordinate in the plane of the insulator sub-image;
the method comprises the steps that three-dimensional laser scanning is adopted to obtain image information of an insulator to be measured; the three-dimensional laser is obtained by adopting a plurality of linear laser heads as laser scanning elements and simultaneously adopting a plurality of visible light cameras separated from the laser heads as measuring elements to realize the measurement of the creepage distance of the insulator to be measured; the effective length of the creepage distance is marked by manually setting a creepage distance starting measurement position and a creepage distance ending measurement position in the visible light image shot by the visible light camera.
2. The automatic measuring device for the creepage distance of the insulator according to claim 1, wherein: still include lead screw hand wheel (11), lead screw hand wheel (11) set up in lead screw (4) top, lead screw hand wheel (11) are connected lead screw (4), through rocking lead screw hand wheel (11) drive lead screw (4) motion.
3. The automatic measuring device for the creepage distance of the insulator according to claim 1, wherein: still include electrical junction box (9), electrical junction box (9) set up in the support bottom, adjust laser head mount pad (6) the sample hangs fixing device (8), adjusts industry camera mount pad (12) and all inserts through the wire in electrical junction box (9).
4. The automatic measuring device for the creepage distance of the insulator according to claim 1, wherein: the test article hanging and fixing device (8) horizontally and freely slides along the horizontal moving guide rail (1), and a locking device is arranged on the test article hanging and fixing device (8).
5. The automatic measuring device for the creepage distance of the insulator according to claim 1, wherein: the detection unit mounting frame (7) adopts an arc-shaped or bent frame.
6. An insulator creepage distance automatic measuring device according to any one of claims 1 to 5, characterized in that: the bottom of the support is provided with a roller (14), and the roller (14) is provided with a braking device.
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| CN110631633B (en) * | 2019-09-05 | 2021-03-09 | 四川大学 | Insulator parameter automatic checkout device |
| CN113009416B (en) * | 2021-04-08 | 2024-03-12 | 国网江苏省电力有限公司检修分公司 | Insulator detection positioning method based on laser sensor array |
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