CN116539709A - Bridge inhaul cable broken wire detection and measurement system and method based on electromagnetic technology - Google Patents
Bridge inhaul cable broken wire detection and measurement system and method based on electromagnetic technology Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/0206—Three-component magnetometers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention relates to a bridge stay cable broken wire detection and measurement system and method based on electromagnetic technology, comprising the following steps: the triaxial non-magnetic simulation turntable and the excitation-movement-clamping integrated device are sleeved on the inhaul cable, and the triaxial non-magnetic simulation turntable is arranged on one side of the excitation-movement-clamping integrated device. The beneficial effects of the invention are as follows: the triaxial non-magnetic simulation turntable is inserted with the triaxial fluxgate magnetic sensor, so that the rotation of multiple dimensions of the magnetic field measurement platform can be simulated, the magnetic gradient tensor can be measured at any angle through the triaxial non-magnetic turntable detection sensor during experiments, output signals of the triaxial magnetic sensor are displayed and stored in real time through a connecting computer, the measurement platform at any detection point can be simulated to rotate in the magnetic field measurement process through maneuvering operation on the triaxial non-magnetic turntable, and the computer is assisted to display and store signals output by the magnetic field detection sensor in a shaking state in real time.
Description
Technical Field
The invention belongs to the technical field of inhaul cable magnetic field measurement and research, and particularly relates to a bridge inhaul cable broken wire detection and measurement system and method based on an electromagnetic technology.
Background
Cable damage can bring about a great potential safety hazard to bridges with cables, such as cable-stayed bridges, and the suspension bridge is more attractive with the increase of time, but because whether the cable is damaged or not can not be directly distinguished by naked eyes, special technology or equipment is needed.
The existing measuring methods, such as a manual detection method, an X-ray detection method, a fiber bragg grating detection method and the like, have more or less defects, have great consumption of manpower and material resources, have inaccurate measuring results and the like.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a bridge stay cable broken wire detection and measurement system and method based on an electromagnetic technology.
The bridge guy cable broken wire detection and measurement system based on electromagnetic technology comprises: the three-axis non-magnetic simulation turntable and the excitation-movement-clamping integrated device are sleeved on the inhaul cable, and the three-axis non-magnetic simulation turntable is arranged on one side of the excitation-movement-clamping integrated device;
the triaxial non-magnetic simulation turntable comprises a verification table base, a table top, a table body and an objective table, wherein the table top is rotationally connected with the verification table base, two stand columns are arranged on the table top, a left half-shaft screw rod and a right half-shaft screw are arranged between the two stand columns, and the table body is arranged at the joint of the left half-shaft screw rod and the right half-shaft screw; the upright post is provided with an X worm and an X worm wheel which are used for controlling the console body to rotate around the axis of the left half-shaft screw rod;
An objective table is rotationally connected above the table body, and a Z-axis worm and a worm wheel for controlling the rotation of the objective table are arranged on the table body; a magnetic field detection sensor is fixed on the objective table and comprises a tool, and a triaxial fluxgate sensor is inserted on the tool;
the excitation-movement-clamping integrated device comprises a quarter square cylinder and a climbing device, the quarter square cylinders are spliced to form a cylindrical structure provided with an excitation coil, and the excitation-movement-clamping integrated device moves along a inhaul cable through the climbing device.
As preferable: the side surface of the checking table base is inserted with a Y-axis worm used for adjusting the rotation angle of the table top, a Y-axis worm seat is wrapped outside the Y-axis worm, the front end and the rear end of the Y-axis worm seat are respectively wrapped with a Y-axis worm seat front cover and a Y-axis worm seat rear cover, and the Y-axis worm seat is inserted with a worm locking nail used for locking and starting fine adjustment of the Y-axis worm; one end of the Y-axis worm, which extends out of the Y-axis worm seat, is connected with a Y-axis worm hand wheel and a worm hand wheel rod;
the checking table base is also provided with a stator and a Y-axis locking rod for locking and starting the table surface to rotate roughly, and one end of the Y-axis locking rod extending out of the checking table base is provided with a Y-axis locking button for twisting the Y-axis locking rod; the checking table base is internally provided with a gear which is connected with the Y-axis worm, the gear is provided with scales, the scale ranges from 0 degree to 360 degrees, and the checking table base is internally provided with a Y encoder for transmitting the gear scale information code to an external interface computer.
As preferable: the two stand columns are a left stand column and a right stand column respectively, the upper part of the left stand column is provided with a worm seat, an X worm penetrates through the worm seat, one end of the X worm is provided with an X-axis worm hand wheel, the middle part of the X worm is provided with threads, an X worm wheel is arranged above the X worm, a gear which is correspondingly coupled with the threads of the X worm is arranged on the X worm wheel, and a worm wheel cover is arranged outside the X worm wheel;
the left side end of the left half shaft screw rod is inserted into the left upright post and is connected with the X worm wheel and the locking knob through an internal gear, and the scale range of the internal gear is 0-360 degrees; the right side end of the left half-shaft screw rod is connected with a right half-shaft screw, and the right side end of the right half-shaft screw is connected with a right upright post; the right side of the right upright post is connected with an X encoder for transmitting the gear scale information code to an external interface computer, the outside of the X encoder is covered with an encoder cover, the right part of the X encoder is connected with a scale disc, the scale range of the scale disc is 0-360 degrees, and the scale disc is synchronous with an internal gear; the X worm wheel is connected with a clutch hand wheel for locking and starting the table body and coarsely adjusting the rotation angle of the table body around the axis of the left half-shaft screw rod, a lock shaft seat is arranged between the worm wheel cover and the left upright post, and a lock shaft knob for locking and starting the table body and finely adjusting the rotation angle of the table body around the axis of the left half-shaft screw rod is inserted on the lock shaft seat.
As preferable: the middle joint of the left half shaft screw rod and the right half shaft screw is connected with a table body, a Z shaft is arranged in the table body, the lower part of the Z shaft is connected with a worm wheel, and the lower part of the Z shaft is provided with a Z shaft end cover and a worm locking nail; the worm wheel is connected with a Z-axis worm for controlling the Z-axis to rotate greatly, the Z-axis worm is fixedly connected to the table body through a Z-axis worm seat and a Z-axis worm seat, the Z-axis worm is connected with a Z-axis worm hand wheel and a hand wheel rod, and the Z-axis worm rotates along with the Z-axis worm hand wheel; a Z-axis locking rod is arranged in the middle of the table body, and a Z-axis locking button is arranged outside the Z-axis locking rod; the top end of the Z shaft is provided with a Z dial on the upper part of the table body, the Z dial is provided with a tool mounting seat, and the tool is fixedly arranged on the upper part of the tool mounting seat; the Z encoder is arranged in the table body and used for transmitting the Z dial scale information code to an external interface computer, and the Z encoder is connected with the Z dial.
As preferable: the excitation-movement-clamping integrated device comprises a quarter square cylinder, a part of a exciting coil is arranged in each of the quarter square cylinders, each of the quarter square cylinders is provided with a coil clamping groove and a coil clamping head, two ends of the section of the exciting coil in each of the quarter square cylinders are respectively connected to the coil clamping grooves and the coil clamping heads, adjacent quarter square cylinders are spliced through the coil clamping grooves and the coil clamping heads, and the coil clamping grooves and the coil clamping heads are conductors;
The inner wall of the excitation-movement-clamping integrated device is provided with a climbing device, the climbing device comprises a climbing structure and a gear adjusting structure, the climbing structure comprises a pulley, a rotating bearing, a connecting rod, a driving belt, an active synchronizing wheel, a connecting rod, a retarder, an engine and an adjusting gear for controlling the rotating angle of the connecting rod, the output end of the engine is connected with the rotating bearing through the retarder, the rotating bearing is connected with the active synchronizing wheel through the driving belt, the rotating shaft of the active synchronizing wheel is a connecting rod, the pulley is also arranged on the connecting rod, and the connecting rod is connected with the adjusting gear through the connecting rod; and each quarter square cylinder is provided with a climbing device.
As preferable: the triaxial non-magnetic simulation turntable further comprises a bottom plate, the calibration table base is supported on the bottom plate through a plurality of groups of base supporting nails and bottom pads, and the calibration table base is fixedly connected with the bottom plate through a plurality of connecting screws;
the bottom end of the excitation-movement-clamping integrated device is connected with a disc through a non-magnetic flexible connecting rod piece, and a plurality of spring telescopic buckles are arranged on the disc; the base plate of the triaxial nonmagnetic simulation turntable is fixed on the disc through a spring telescopic buckle, and the relative positions of the triaxial nonmagnetic simulation turntable and the excitation-movement-clamping integrated device are unchanged.
As preferable: the tooling is in a cross shape, an inner ring slot and an outer ring slot are arranged on the tooling, and a triaxial fluxgate sensor is inserted in the inner ring slot or the outer ring slot; when the triaxial fluxgate sensor is inserted in the inner ring slot, the insert block is inserted in the outer ring slot; when the triaxial fluxgate sensor is inserted in the outer ring slot, the insert block is inserted in the inner ring slot; the shape of the insert block is the same as that of the triaxial fluxgate sensor, and the material of the insert block is the same as that of the tooling.
The measuring method of the bridge guy cable broken wire detection measuring system based on the electromagnetic technology comprises the following steps:
step one, splicing and installing an excitation-movement-clamping integrated device on a inhaul cable; assembling a triaxial non-magnetic simulation turntable, adjusting the level of a table top, and inserting a triaxial fluxgate sensor and an insert block into the tool;
step two, the rotation angles of three rotating shafts of the triaxial nonmagnetic simulation turntable are adjusted to be 0 degrees, and the triaxial nonmagnetic simulation turntable is fixed on a disc at one side of the excitation-movement-clamping integrated device through a spring telescopic buckle;
step three, current excitation is carried out through an excitation coil, and a magnetic gradient tensor is obtained through a three-axis fluxgate sensor; the rotation angle of the platform body around the axis of the left half shaft screw rod is adjusted for a plurality of times by taking 45 degrees as step length, and magnetic gradient tensors under a plurality of angles are obtained;
Step four, adjusting the rotation angle of the table top, and repeating the step four once every 45 degrees of rotation of the table top until the rotation angle of the table top reaches 360 degrees;
step five, synchronously climbing the excitation-movement-clamping integrated device and the triaxial nonmagnetic simulation turntable through the climbing device, repeating the step four to the step six every climbing for a certain unit length, and recording the distance section of the critical point of the magnetic gradient tensor change;
and step six, returning to a distance section where the critical point of the magnetic gradient tensor change is located, repeating the step three to the step five for the distance section, extracting the characteristics of the magnetic gradient tensor change through a magnetic anomaly target extraction technology, and then carrying out magnetic target identification based on multi-mode machine learning.
Preferably, in the second step, the method for adjusting the rotation angles of the three rotating shafts of the triaxial nonmagnetic simulation turntable to 0 degrees comprises the following steps:
tightening the worm locking nail, loosening the Y-axis locking rod, and roughly adjusting the rotation angle of the table top; tightening the Y-axis locking rod, loosening the worm locking nail, and fine-adjusting the rotation angle of the table top through the worm hand wheel rod until the Y encoder detects that the gear reading in the base of the checking table is 0 degree; tightening the worm locking nail and the Y-axis locking rod;
When the clutch hand wheel is loosened and the shaft locking knob is screwed up, the left half shaft screw rod and the right half shaft screw are directly screwed manually, and the rotation angle of the table body around the axis of the left half shaft screw rod is subjected to rough adjustment; the clutch hand wheel is screwed down, the shaft locking knob is loosened, the X worm is rotated through the X worm hand wheel to drive the X worm wheel to conduct fine adjustment until the X encoder detects that the reading of the dial is 0 degrees, and the clutch hand wheel and the shaft locking knob are screwed down;
loosening the worm locking nail and the worm locking nail, tightening the Z-axis locking rod, and directly and manually adjusting the rotation angle of the tool around the Z axis in a rough adjustment mode; tightening the worm locking nail and the worm locking nail, loosening the Z-axis locking rod, rotating the Z-axis worm through the Z-axis worm hand wheel, and finely adjusting the rotating angle of the tool around the Z axis until the Z encoder detects that the reading of the Z dial is 0 degree; and the worm locking nail, the worm locking nail and the Z-axis locking rod are all screwed.
As preferable: two groups of comparison experiments are carried out, in one group of experiments, a triaxial fluxgate sensor is inserted into an inner ring slot of the tool, and an insert block is inserted into an outer ring slot; in another set of experiments, a three-axis fluxgate sensor was inserted into an outer ring slot of the tooling, and an insert was inserted into an inner ring slot.
The beneficial effects of the invention are as follows:
1) The triaxial nonmagnetic simulation turntable with the triaxial magnetic field measurement function is provided, the triaxial nonmagnetic simulation turntable is inserted with the triaxial fluxgate magnetic sensor, the rotation of a plurality of dimensions of a magnetic field measurement platform can be simulated, the triaxial nonmagnetic turntable detection sensor can be used for measuring the magnetic gradient tensor at any angle in the experiment, the output signal of the triaxial magnetic sensor is displayed and stored in real time through being connected with a computer, the mobile operation on the triaxial nonmagnetic turntable can simulate the rotation of the measurement platform at any detection point in the magnetic field measurement process, and the computer is used for displaying and storing the signal output of the magnetic field detection sensor in a shaking state in real time.
2) Three axes of rotation of triaxial fluxgate magnetic sensor all can carry out the angle modulation of two kinds of different precision of coarse adjustment and fine adjustment, and reads rotation angle through the encoder, and angle modulation precision is high, is favorable to reducing the inspection error.
3) The excitation-movement-clamping integrated device can be sleeved on a inhaul cable and crawl, and a complete excitation coil is formed after the excitation-movement-clamping integrated device is spliced by four quarter square cylinders and is used for exciting a bridge inhaul cable to be detected; the detection sensitivity depends on the intensity of the magnetic field generated by the excitation circuit, so that the detection accuracy can be finally improved by changing the detection sensitivity.
Drawings
FIG. 1 is a schematic three-dimensional structure of a tooling;
FIG. 2 is a top view of the tooling;
FIG. 3 is a front view of the tooling;
FIG. 4 is a top view of the tooling;
FIG. 5 is a schematic diagram of a three-axis nonmagnetic turntable with the bottom plate of the calibration stand up;
FIG. 6 is a schematic diagram of a three-axis nonmagnetic turntable with the bottom plate of the calibration stand in the down position;
FIG. 7 is a schematic structural view of one side of the X worm wheel of the three-axis non-magnetic turntable;
FIG. 8 is a schematic diagram of the structure of one side of the worm wheel of the triaxial nonmagnetic turntable;
fig. 9 is a schematic structural view of the excitation-movement-clamping integrated device;
FIG. 10 is a schematic view of a quarter-square cartridge in an excitation-move-clamp integrated device;
FIG. 11 is a schematic structural view of a climbing structure;
FIG. 12 is a detection flow chart of a bridge cable break detection system;
FIG. 13 is a flow chart of a magnetic anomaly target extraction technique;
FIG. 14 is a magnetic target identification flow chart based on multi-modal machine learning;
FIG. 15 is a schematic diagram of a coordinate system and Euler rotation angles;
FIG. 16 is a schematic diagram of a three-axis fluxgate sensor in a coordinate system.
Reference numerals illustrate: the bottom plate 1, the calibration stand base 2, the stage 6, the magnetic field detection sensor 7, the base support pin 71, the bottom pad 81, the connection screw 91, the Y-axis worm 100, the table top 110, the Y-axis worm seat 120, the Y-axis worm seat front cover 130, the Y-axis worm seat rear cover 140, the Y-axis worm hand wheel 150, the worm hand wheel lever 160, the Y-axis locking lever 180, the Y-axis locking button 181, the left column 211, the right column 212, the worm seat 220, the X-axis worm 230, the X-axis worm hand wheel 240, the X-axis worm wheel 250, the worm wheel cover 260, the clutch hand 270, the lock shaft knob 280, the lock shaft seat 290, the left side shaft screw 300, the right side shaft screw 320, the dial 330, the table 340, the encoder cover 350, the worm wheel 360, the Z-axis shaft cover 351, the worm locking pin 370, the Z-axis worm 390 the Z-axis worm seat 400, the Z-axis worm seat 401, the Z-axis worm hand wheel 410, the hand wheel lever 420, the Z-axis locking lever 430, the Z-axis locking button 431, the Z-axis dial 440, the tool mount 450, the tool 460, the three-axis fluxgate sensor 461, the excitation-movement-clamping integrated device 480, the hole 490, the excitation coil 500, the quarter square cylinder 540, the non-magnetic flexible connection rod 601, the disc 600, the spring expansion buckle 591, the coil clamping groove 541, the coil clamping head 542, the climbing device 520, the climbing structure 610, the gear adjusting structure 620, the pulley 613, the rotating bearing 614, the connection rod 615, the transmission belt 617, the active synchronizing wheel 618, the connection rod 630, the retarder 640, the engine 650, the adjusting gear 660.
Detailed Description
The invention is further described below with reference to examples. The following examples are presented only to aid in the understanding of the invention. It should be noted that it will be apparent to those skilled in the art that modifications can be made to the present invention without departing from the principles of the invention, and such modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Example 1
As an embodiment, as shown in fig. 1 to 11, the bridge cable broken wire detection and measurement system based on electromagnetic technology includes: the triaxial non-magnetic simulation turntable and the excitation-movement-clamping integrated device 480 are sleeved on the inhaul cable, and the triaxial non-magnetic simulation turntable is arranged on one side of the excitation-movement-clamping integrated device 480; the triaxial non-magnetic simulation turntable comprises a checking table base 2, a bottom horizontal turntable 3, a table body 340 and an objective table 6.
As shown in fig. 7, the side surface of the calibration stand base 2 is inserted with a Y-axis worm 100 for adjusting the rotation angle of the table top 110, the Y-axis worm 100 is wrapped with a Y-axis worm seat 120, the front end and the rear end of the Y-axis worm seat 120 are respectively wrapped with a Y-axis worm seat front cover 130 and a Y-axis worm seat rear cover 140, and the Y-axis worm seat 120 is inserted with a worm locking nail for locking and starting fine adjustment of the Y-axis worm 100; one end of the Y-axis worm 100 extending out of the Y-axis worm seat 120 is connected with a Y-axis worm hand wheel 150 and a worm hand wheel rod 160;
The checking table base 2 is also provided with a stator and a Y-axis locking rod 180 for locking and starting the rotation rough adjustment of the table top 110, and one end of the Y-axis locking rod 180 extending out of the checking table base 2 is provided with a Y-axis locking button 181 for twisting the Y-axis locking rod 180; the checking table base 2 is internally provided with a gear which is connected with the Y-axis worm 100, the gear is provided with scales, the scale ranges from 0 degree to 360 degrees, the precision is 0.01 degree, and the checking table base 2 is internally provided with a Y encoder for transmitting the gear scale information code to an external interface computer.
The table top 110 is rotationally connected with the checking table base 2, the table top 110 is provided with a left upright post 211 and a right upright post 212, the upper part of the left upright post 211 is provided with a worm seat 220, an X worm 230 penetrates through the worm seat 220, one end of the X worm 230 is provided with an X-axis worm hand wheel 240, the middle part of the X worm 230 is provided with threads, an X worm wheel 250 is arranged above the X worm 230, the X worm wheel 250 is provided with gears which are coupled with the threads of the X worm 230, and the outside of the X worm wheel 250 is provided with a worm wheel cover 260;
as shown in fig. 5 to 7, a left half shaft screw rod 300 and a right half shaft screw 320 are arranged between the left upright post 211 and the right upright post 212, and a platform 340 is arranged at the joint of the left half shaft screw rod 300 and the right half shaft screw 320; the left upright post 211 is provided with an X worm 230 and an X worm wheel 250 which are used for controlling the console 340 to rotate around the axis of the left side shaft screw 300; the left side end of the left half shaft screw rod 300 is inserted into the left upright post 211 and is connected with the X worm wheel 250 and the locking knob 280 through an internal gear, the scale range of the internal gear is 0-360 degrees, and the precision is 0.01 degrees; the right side end of the left half-shaft screw rod 300 is connected with a right half-shaft screw 320, and the right side end of the right half-shaft screw 320 is connected with a right upright post 212; the right side of the right upright post 212 is connected with an X encoder for transmitting the gear scale information code to an external interface computer, the outside of the X encoder is covered with an encoder cover 350, the right part of the X encoder is connected with a scale plate 330, the scale range of the scale plate 330 is 0-360 degrees, the precision is 0.01 degrees, and the scale plate 330 is synchronous with an internal gear; therefore, the X encoder simultaneously collects the readings of the dial 330 and the internal gear, the X worm wheel 250 is connected with the clutch hand wheel 270 for locking and starting the platform 340 to rotate around the axis of the left half-shaft screw 300 in a rough adjustment manner, a lock shaft seat 290 is arranged between the worm wheel cover 260 and the left upright post 211, and a lock shaft knob 280 for locking and starting the platform 340 to rotate around the axis of the left half-shaft screw 300 in a fine adjustment manner is inserted on the lock shaft seat 290.
As shown in fig. 5 and 6, a Z-axis is provided in the table 340, a worm wheel 360 is connected to the lower part of the Z-axis, and a Z-axis end cover 351 and a worm locking pin 370 are provided to the lower part of the Z-axis; the worm wheel 360 is coupled and connected with a Z-axis worm 390 for controlling the Z-axis to rotate greatly, the Z-axis worm 390 is fixedly connected to the table 340 by a Z-axis worm seat 400 and a Z-axis worm seat 401, the Z-axis worm 390 is connected with a Z-axis worm hand wheel 410 and a hand wheel lever 420, and the Z-axis worm 390 rotates along with the Z-axis worm hand wheel 410; the middle part of the table body 340 is provided with a Z-axis locking rod 430, and the Z-axis locking button 431 is arranged outside the Z-axis locking rod 430; the top end of the Z shaft is provided with a Z dial 440 supported on the upper part of the table body 340, the Z dial 440 is provided with a tool mounting seat 450, and a tool 460 is fixedly arranged on the upper part of the tool mounting seat 450; the stage 340 is provided with a Z encoder for transmitting the scale information code of the Z dial 440 to an external interface computer, and the Z encoder is connected with the Z dial 440.
As shown in fig. 1 to 5, a stage 6 is rotatably connected above a stage 340, and a Z-axis worm 390 and a worm wheel 360 for controlling rotation of the stage 6 are provided on the stage 340; the magnetic field detection sensor 7 is fixed on the objective table 6, the magnetic field detection sensor 7 comprises a tool 460, and a triaxial fluxgate sensor 461 is inserted on the tool 460; the tooling 460 is in a cross shape, adopts a mesa type U-T-T structure, and the axes of the shafts are orthogonal in space, eight grooves are formed in the tooling 460, namely an inner ring slot and an outer ring slot, and a triaxial fluxgate sensor 461 is inserted in the inner ring slot or the outer ring slot; when the triaxial fluxgate sensor 461 is inserted into the inner ring slot, the insert block is inserted into the outer ring slot; when the triaxial fluxgate sensor 461 is inserted into the outer ring slot, the insert block is inserted into the inner ring slot; the insert is the same shape as the three-axis fluxgate sensor 461, and has a length of 2cm, a width of 5cm, and a height of 3cm. The insert and tooling 460 are the same material.
Except for the three-axis fluxgate sensor 461, all parts and periods of the three-axis non-magnetic simulation turntable main body are made of non-magnetic materials, and most of non-magnetic aluminum alloys and a few of titanium alloys and copper alloys are used for preventing sticking together due to the ductility of the materials. The aluminum alloy accounts for about 90% and the titanium alloy and copper alloy account for 10%. The magnetic navigation device can be used for detection and test of magnetic navigation components and can also be used for preliminary verification and measurement of three-dimensional corners of other instruments.
The three rotation axes of the three-axis fluxgate sensor 461 are respectively an X axis, a Y axis and a Z axis, wherein the rotation about the X axis is pitching rotation of the table 340 about the axis of the left side screw 300, the rotation about the Y axis is azimuth rotation of the table 110 on the horizontal plane, and the rotation about the Z axis is rotation of the stage 6 above the table 340, wherein the rotation about the Y axis and the rotation about the Z axis are perpendicular to the rotation about the X axis, respectively. The three-axis transmission realizes the combination of coarse adjustment and fine adjustment and secondary adjustment and locking by adopting a manual rapid coarse adjustment mechanism and a tangent fine adjustment mechanism, the three rotating shaft systems are all provided with grating sensors for measuring angles of the shaft system, the grating sensors consist of glass gratings and a plurality of reading heads, and a multi-reading head non-uniform cross distribution installation mode is adopted; the three rotating bearings all transmit measurement data with the control box through the connecting cable, the control box is connected with the upper computer software, triaxial angle data of the measured piece is displayed in the display screen, the display screen can display angles in all axial directions, the angles can also be manually adjusted and reset to 0 or other numerical values, and units of angle conversion and transformation of different angles can be carried out.
The parameters of the triaxial non-magnetic simulation turntable are specifically as follows:
number of axes of the turntable: three axes;
the weight of the turntable: 35kg;
the mechanism and the mechanical locking mechanism are used for preventing the locking mechanism from affecting the reading accuracy of the angle of the turntable.
The three axes of angular position reading all adopt the reading form of vernier and scale ring, similar to vernier caliper principle. The initial whole-degree angle value is read according to the zero position dividing line of the cursor, and the nearest cursor value aligned with a scale line of the observation cursor is the angle value. The cursor resolution is 0.05 deg. and the digital display resolution is 1 ".
Flatness of mounting surface: 0.005mm.
Fine tuning: the three shafts are added with a clutch fine adjustment mechanism.
Magnetic permeability of material: less than or equal to 1.05.
Amount of jump: less than or equal to 0.02mm.
The orthogonality degree of two axes is less than or equal to 0.1 degrees, and the intersection degree of three axes is less than or equal to 1mm.
Rotation error: less than or equal to +/-0.01 degrees.
Angular range: the triaxial is 360 degrees infinite.
Angular position measurement resolution: better than 0.002 degrees.
The three shafts can rotate at any angle and can be locked at any angle.
The display screen is a touchable display screen; the interface provides a communication interface and can be developed for the second time; the software supports the encoder bit number selection setting; support degree, second display unit switching; supporting manual setting of any angle value; supporting triaxial forward and reverse arrangement.
Environmental requirements: the relative humidity is not more than 70% at 20+/-5 ℃, the air flow in a turntable laboratory is stable, no electromagnetic interference exists, and the surrounding does not have severe vibration and impact.
As shown in fig. 6, the triaxial non-magnetic simulation turntable further comprises a bottom plate 1, the calibration stand base 2 is supported on the bottom plate 1 through a plurality of groups of base support nails 71 and bottom pads 81, and the levelness of the calibration stand base 2 can be adjusted by adjusting the base support nails 71; the checking table base 2 and the bottom plate 1 are fixedly connected through a plurality of connecting screws 91;
as shown in fig. 9, the bottom end of the excitation-movement-clamping integrated device 480 is connected with a disc 600 through a non-magnetic flexible connecting rod 601, and a plurality of spring telescopic buckles 591 are arranged on the disc 600; the bottom plate 1 of the triaxial nonmagnetic simulation turntable is fixed on the disc 600 through the spring telescopic buckle 591, the relative positions of the triaxial nonmagnetic simulation turntable and the excitation-movement-clamping integrated device 480 are unchanged, the triaxial nonmagnetic simulation turntable and the excitation-movement-clamping integrated device move up and down together, and experimental errors are reduced.
As shown in fig. 10, the excitation-movement-clamping integrated device 480 includes a quarter-square cylinder 540 and a climbing device 520, and the four quarter-square cylinders 540 are spliced to form a cylindrical structure provided with the excitation coil 500, and the excitation-movement-clamping integrated device 480 is moved along a cable by the climbing device 520. The excitation-movement-clamping integrated device 480 comprises a quarter square cylinder 540, wherein a part of the excitation coil 500 is arranged in each of the quarter square cylinders 540, each of the quarter square cylinders 540 is provided with a coil clamping groove 541 and a coil clamping head 542, two ends of the section of the excitation coil 500 in each of the quarter square cylinders 540 are respectively connected to the coil clamping grooves 541 and the coil clamping heads 542, and the coil clamping grooves 541 and the coil clamping heads 542 are conductors; after the adjacent quarter square barrels 540 are spliced by the coil clamping grooves 541 and the coil clamping heads 542, the exciting coil 500 is also closed to complete loop communication. The quarter square cylinders 540 are all made of aluminum alloy materials, namely nonmagnetic materials, so that experimental errors caused by the magnetic field of the device are avoided.
As shown in fig. 11, a climbing device 520 is arranged on each quarter square cylinder 540 of the excitation-movement-clamping integrated device 480, the climbing device 520 comprises a climbing structure 610 and a gear adjusting structure 620, the climbing structure 610 comprises a pulley 613, a rotating bearing 614, a connecting rod 615, a driving belt 617, a driving synchronizing wheel 618, a connecting rod 630, a retarder 640, an engine 650 and an adjusting gear 660 for controlling the rotating angle of the connecting rod 615, the output end of the engine 650 is connected with the rotating bearing 614 through the retarder 640, the rotating bearing 614 is connected with the driving synchronizing wheel 618 through the driving belt 617, the rotating shaft of the driving synchronizing wheel 618 is a connecting rod 630, the pulley 613 is also arranged on the connecting rod 630, and the connecting rod 630 is connected with the adjusting gear 660 through the connecting rod 615; the adjusting gear 660 can be used to control the angle of rotation of the link 615, thereby changing the angle of the pulley 613 relative to the bridge cable to accommodate cables of different diameters.
In order to avoid the additional burden caused by the gravity of the climbing device 520 and ensure that other devices except the inhaul cable cannot cause errors to the measurement structure, the climbing structure 610 and the gear adjusting structure 620 are made of copper alloy and aluminum alloy, and in order to avoid the adhesion of the components due to the ductility of the same intermetallic material, the components are made of copper alloy and aluminum alloy in an alternative mode.
Example two
For magnetic gradient tensor measurement arrays, coordinate system misalignment errors between the sensors are the dominant errors affecting measurement accuracy. On the one hand, the metal structure of the magnetic gradient tensor measurement array cannot reach ideal precision in the processing and manufacturing process, and errors necessarily exist in each dimension; on the other hand, the three-axis fluxgate sensor 461 may introduce mounting errors by manual operation in mounting the constituent measuring arrays.
After determining an arbitrary initial orthogonal coordinate system, a new coordinate system is formed after three axis angle rotations.
As shown in fig. 15, the rotation angles α, β, and γ during rotation conversion are referred to as "euler rotation angles". The final initial coordinate system O-XYZ is transformed into a new coordinate system O-X by rotation of coordinate axes 2 Y 2 Z 2 . The rotation variation process can be expressed as a form of matrix multiplication:
as shown in fig. 16, two of the three-axis fluxgate sensors 461 are respectively denoted as S 2 And S is 4 For example, S 2 Is the initial coordinate system, S 4 The three-component error of the magnetic field of the two three-axis fluxgate sensors 461 can be expressed as:
when the euler rotation angles α, β, γ are all zero, the magnetic field three-component measurement error of the two three-axis fluxgate sensors 461 is zero.
In the case where alignment calibration is not achieved, the magnetic field three-component measurement error of the two three-axis fluxgate sensors 461 must not be zero. When the three component measurement errors of the three-axis fluxgate sensor 461 on the left side of the above equation are all zero, i.e. [ D ] X D Y D Z ] T When=0, changing the pose of the magnetic gradient tensor measurement array to obtain three-component measurement values of the N sets of three-axis fluxgate sensors 461, the following linear equation set can be established:
in the method, in the process of the invention,is a three-axis fluxgate sensor S 1 Is the nth set of three component measurements; />Is a three-axis fluxgate sensor S 2 Is the nth set of three component measurements; a is a parameter matrix, and the expression is:
during the measurement of the array changing attitude, the coordinate system of any two three-axis fluxgate sensors 461 will not deflect relatively, so the parameter matrix a is unchanged. The three-component measurement values of each two three-axis fluxgate sensors 461 in any posture are known, so that the above-described linear equation set can be solved, thereby obtaining the euler rotation angles α, β, γ between any two magnetic sensor coordinate systems. Theoretically, the more poses of the magnetic gradient tensor measurement array, the more accurate the solution.
As a new embodiment, the method for detecting the bridge cable broken wire detection and measurement system based on the electromagnetic technology as set forth in the first embodiment is shown in fig. 12 to 14, and includes the following steps:
Firstly, confirming that the periphery is free of magnetic materials, wherein the periphery is free of magnetic materials at least within the radius of 1m, and the walls and the floors of the reinforced building are also regarded as magnetic material instruments; the navigation cable is connected between the turntable and the display; switching on an AC power line; switching on a power switch, enabling a display screen to enter a starting interface, and normally starting; and (3) parameter setting and measurement, entering a measurement interface after starting up, and clicking a display area of any axis to perform custom setting on the current angle. After the setting is finished, the relative angle can be conveniently measured; the setting range of the three rotating shafts is 0-360.00 degrees, and the precision is 0.01 degrees; cancel input and return as ESC; pressing the OK key completes the input and returns.
Assembling the excitation-movement-clamping integrated device 480 on a guy cable; assembling a triaxial non-magnetic simulation turntable, adjusting the level of the table top 110, and screwing the connecting screw 91 of the checking table base 2 to prevent the base supporting nail 71 from loosening; inserting a three-axis fluxgate sensor 461 and an insert block on the tooling 460;
step two, tightening worm locking nails, loosening Y-axis locking rods 180, and roughly adjusting the rotation angle of the table top 110; tightening the Y-axis locking rod 180, loosening the worm locking nail, and fine-adjusting the rotation angle of the table top 110 through the worm hand wheel rod 160 until the Y encoder detects that the gear reading in the checking table base 2 is 0 degrees; tightening the worm locking pin and the Y-axis locking rod 180;
When the clutch hand wheel 270 is loosened and the lock shaft knob 280 is screwed up, the left half shaft screw rod 300 and the right half shaft screw 320 are directly screwed manually, and the rotation angle of the platform 340 around the axis of the left half shaft screw rod 300 is coarse-tuned; tightening the clutch hand wheel 270, loosening the lock shaft knob 280, rotating the X worm 230 through the X worm hand wheel 240 to drive the X worm wheel 250 to fine tune until the X encoder detects that the reading of the dial 330 is 0 degrees, and tightening the clutch hand wheel 270 and the lock shaft knob 280;
loosening the worm locking nail 370 and the worm locking nail 380, tightening the Z-axis locking rod 430, and directly and manually roughly adjusting the rotation angle of the tool 460 around the Z axis; tightening the worm locking nail 370 and the worm locking nail 380, loosening the Z-axis locking rod 430, rotating the Z-axis worm 390 through the Z-axis worm hand wheel 410, and fine-adjusting the rotation angle of the tool 460 around the Z axis until the Z encoder detects that the reading of the Z dial 440 is 0 degrees; tightening worm locking pin 370, worm locking pin 380, and Z-axis locking bar 430; after the rotation angles of the three rotating shafts of the three-shaft non-magnetic simulation turntable are adjusted to be 0 degrees, the three-shaft non-magnetic simulation turntable is fixed on the disc 600 at one side of the excitation-movement-clamping integrated device 480 through the spring telescopic buckle 591;
Step three, free oscillation is generated by using a pulse high-current excitation coil 500, so that alternating magnetic field excitation is carried out on a bridge guy cable, and magnetic gradient tensor is obtained through a triaxial fluxgate sensor 461; the rotation angle of the platform 340 around the axis of the left half-shaft screw 300 is adjusted for a plurality of times by taking 45 degrees as step length, and magnetic gradient tensors under a plurality of angles are obtained;
step four, adjusting the rotation angle of the table top 110, and repeating the step four once every 45 degrees of rotation of the table top 110 until the rotation angle of the table top 110 reaches 360 degrees;
step five, the excitation-movement-clamping integrated device 480 and the triaxial non-magnetic simulation turntable are enabled to climb synchronously through the climbing device 520, each climbing is of a certain unit length, the step four to the step six are repeated, the magnetic gradient tensor of the position caused by the bridge guy wire breakage is changed, and the distance section of the critical point of the magnetic gradient tensor change is recorded;
and step six, returning to a distance section where the critical point of the magnetic gradient tensor change is located, repeating the steps three to five for the distance section, and extracting the characteristics of the magnetic gradient tensor change through a magnetic anomaly target extraction technology, as shown in fig. 13.
Then, the magnetic target recognition based on the multi-mode machine learning is performed, and after the original signal is obtained, since the trainer recognizes the target using only the simple feature vector and the finest data, in this case, it is necessary to extract the most suitable and refined geomagnetic signal recognition feature to recognize the shape of the tiny magnetic anomaly object under the cable, as shown in fig. 14.
Two groups of comparison experiments are carried out by using the method, in one group of experiments, in the first step, a triaxial fluxgate sensor 461 is inserted into an inner ring slot of the tool 460, and an insert block is inserted into an outer ring slot; in another set of experiments, in step one, three-axis fluxgate sensor 461 was inserted into the outer ring slot of tooling 460, and the insert was inserted into the inner ring slot.
The circuit board can send out various waveforms, provides various choices for measurement results, avoids known or unknown errors caused by a single waveform, and when the bridge cable broken wire detection and measurement system is utilized, the detection sensitivity is not only dependent on the sensitivity of the Hall element like the Hall element, but also dependent on the intensity change of a magnetic field generated by an excitation circuit, so that the detection sensitivity can be changed through the bridge cable broken wire detection and measurement system, and finally the detection accuracy is improved; and simultaneously, a direct current power supply is used for providing charging energy for the capacitor. The computer is provided with the triaxial fluxgate magnetometer shaking interference elimination software, the software can be utilized to calculate the compensation coefficient of interference elimination through static measurement output of the triaxial fluxgate sensor 461 at different angles, and the real-time compensation and compensation result display can be carried out on the output of the triaxial fluxgate sensor 461 in a shaking state by combining the coefficient.
The bridge guy cable broken wire detection and measurement system based on the electromagnetic technology can adopt a sea, land and air mode for transportation, prevent direct leaching of rainwater in the transportation, prevent strong vibration and impact, and be placed according to the direction of a transportation box mark; the triaxial non-magnetic simulated turntable should be placed in an environment without magnetic material within at least radius 1m, with a relative humidity of less than 85%, and not allowed to contact corrosive gases and liquids. After the triaxial non-magnetic simulation turntable is used for a period of time, lubricating grease of a worm gear and worm transmission pair and other structures is easy to dry, so that the lubricating grease needs to be smeared; the parts of the triaxial non-magnetic simulation turntable are all made of aluminum alloy or copper alloy, the hardness and strength of the material are lower than those of steel parts, the material is easy to scratch or deform, and the material should be held and put lightly when in use.
Claims (10)
1. Bridge cable broken wire detection measurement system based on electromagnetic technology, characterized by comprising: the triaxial non-magnetic simulation turntable and the excitation-movement-clamping integrated device (480) are sleeved on the inhaul cable, and the triaxial non-magnetic simulation turntable is arranged on one side of the excitation-movement-clamping integrated device (480);
the triaxial non-magnetic simulation turntable comprises a verification table base (2), a table top (110), a table body (340) and an objective table (6), wherein the table top (110) is rotationally connected with the verification table base (2), two stand columns are arranged on the table top (110), a left half-shaft screw rod (300) and a right half-shaft screw (320) are arranged between the two stand columns, and the table body (340) is arranged at the joint of the left half-shaft screw rod (300) and the right half-shaft screw (320); the upright post is provided with an X worm (230) and an X worm wheel (250) which are used for controlling the console body (340) to rotate around the axis of the left half-shaft screw rod (300);
An objective table (6) is rotationally connected above the table body (340), and a Z-axis worm (390) and a worm wheel (360) for controlling the rotation of the objective table (6) are arranged on the table body (340); a magnetic field detection sensor (7) is fixed on the objective table (6), the magnetic field detection sensor (7) comprises a tool (460), and a triaxial fluxgate sensor (461) is inserted on the tool (460);
the excitation-movement-clamping integrated device (480) comprises a quarter square cylinder (540) and a climbing device (520), the four quarter square cylinders (540) are spliced to form a cylindrical structure provided with an excitation coil (500), and the excitation-movement-clamping integrated device (480) moves along a inhaul cable through the climbing device (520).
2. The electromagnetic technology-based bridge cable broken wire detection and measurement system according to claim 1, wherein: the side of the checking table base (2) is inserted with a Y-axis worm (100) for adjusting the rotation angle of the table top (110), the Y-axis worm (100) is externally wrapped with a Y-axis worm seat (120), the front end and the rear end of the Y-axis worm seat (120) are respectively wrapped with a Y-axis worm seat front cover (130) and a Y-axis worm seat rear cover (140), and the Y-axis worm seat (120) is inserted with a worm locking nail for locking and starting the fine adjustment of the Y-axis worm (100); one end of the Y-axis worm (100) extending out of the Y-axis worm seat (120) is connected with a Y-axis worm hand wheel (150) and a worm hand wheel rod (160);
The checking table base (2) is also provided with a stator and a Y-axis locking rod (180) for locking and starting the rotation rough adjustment of the table top (110), and one end of the Y-axis locking rod (180) extending out of the checking table base (2) is provided with a Y-axis locking button (181) for twisting the Y-axis locking rod (180); the checking table base (2) is internally provided with a gear, the gear is connected with the Y-axis worm (100), the gear is provided with scales, the scale ranges from 0 degrees to 360 degrees, and the checking table base (2) is internally provided with a Y encoder for transmitting the gear scale information code to an external interface computer.
3. The electromagnetic technology-based bridge cable broken wire detection and measurement system according to claim 1, wherein: the two stand columns are a left stand column (211) and a right stand column (212) respectively, a worm seat (220) is arranged at the upper part of the left stand column (211), an X-axis worm wheel (240) is arranged at one end of the X-axis worm wheel (230) in a penetrating way, threads are arranged in the middle of the X-axis worm wheel (230), an X-worm wheel (250) is arranged above the X-axis worm wheel (230), gears which are correspondingly coupled with the threads of the X-axis worm wheel (230) are arranged on the X-worm wheel (250), and a worm wheel cover (260) is arranged outside the X-worm wheel (250);
the left side end of the left half shaft screw rod (300) is inserted into the left upright post (211) and is connected with the X worm wheel (250) and the locking knob (280) through an internal gear, and the scale range of the internal gear is 0-360 degrees; the right side end of the left half-shaft screw rod (300) is connected with a right half-shaft screw (320), and the right side end of the right half-shaft screw (320) is connected with a right upright post (212); the right side of the right upright post (212) is connected with an X encoder for transmitting the gear scale information code to an external interface computer, the outside of the X encoder is covered with an encoder cover (350), the right part of the X encoder is connected with a scale (330), the scale range of the scale (330) is 0-360 degrees, and the scale (330) is synchronous with an internal gear; the X worm wheel (250) is connected with a clutch hand wheel (270) for locking and starting the platform body (340) and coarsely adjusting the rotation angle of the left half-shaft screw rod (300) axis, a lock shaft seat (290) is arranged between the worm wheel cover (260) and the left upright post (211), and a lock shaft knob (280) for locking and starting the platform body (340) and finely adjusting the rotation angle of the left half-shaft screw rod (300) axis is inserted on the lock shaft seat (290).
4. The electromagnetic technology-based bridge cable broken wire detection and measurement system according to claim 1, wherein: a platform body (340) is connected to the middle connection part of the left half-shaft screw rod (300) and the right half-shaft screw (320), a Z shaft is arranged in the platform body (340), a worm wheel (360) is connected to the lower part of the Z shaft, and a Z shaft end cover (351) and a worm locking nail (370) are arranged on the lower part of the Z shaft; the worm wheel (360) is coupled and connected with a Z-axis worm (390) for controlling the Z-axis to rotate greatly, the Z-axis worm (390) is fixedly connected to the table body (340) through a Z-axis worm seat (400) and a Z-axis worm seat (401), the Z-axis worm (390) is connected with a Z-axis worm hand wheel (410) and a hand wheel lever (420), and the Z-axis worm (390) rotates along with the Z-axis worm hand wheel (410); a Z-axis locking rod (430) is arranged in the middle of the table body (340), and a Z-axis locking button (431) is arranged outside the Z-axis locking rod (430); the top end of the Z shaft is provided with a Z dial (440) supported on the upper part of the table body (340), the Z dial (440) is provided with a tool mounting seat (450), and a tool (460) is fixedly arranged on the upper part of the tool mounting seat (450); the table body (340) is provided with a Z encoder for transmitting the scale information code of the Z dial (440) to an external interface computer, and the Z encoder is connected with the Z dial (440).
5. The electromagnetic technology-based bridge cable broken wire detection and measurement system according to claim 1, wherein: the excitation-movement-clamping integrated device (480) comprises a quarter square cylinder (540), a part of excitation coils (500) is arranged in each of the quarter square cylinders (540), coil clamping grooves (541) and coil clamping heads (542) are formed in each of the quarter square cylinders (540), two ends of each of the sections of the excitation coils (500) in each of the quarter square cylinders (540) are respectively connected to the coil clamping grooves (541) and the coil clamping heads (542), and adjacent quarter square cylinders (540) are spliced through the coil clamping grooves (541) and the coil clamping heads (542), and the coil clamping grooves (541) and the coil clamping heads (542) are conductors;
The excitation-movement-clamping integrated device (480) is characterized in that a climbing device (520) is arranged on the inner wall of the excitation-movement-clamping integrated device (480), the climbing device (520) comprises a climbing structure (610) and a gear adjusting structure (620), the climbing structure (610) comprises a pulley (613), a rotating bearing (614), a connecting rod (615), a transmission belt (617), a driving synchronous wheel (618), a connecting rod (630), a retarder (640), an engine (650) and an adjusting gear (660) for controlling the rotation angle of the connecting rod (615), the output end of the engine (650) is connected with the rotating bearing (614) through the retarder (640), the rotating bearing (614) is connected with the driving synchronous wheel (618) through the transmission belt (617), the rotating shaft of the driving synchronous wheel (618) is a connecting rod (630), the pulley (613) is also arranged on the connecting rod (630), and the connecting rod (630) is connected with the adjusting gear (660) through the connecting rod (615); a climbing device (520) is arranged on each quarter square cylinder (540).
6. The electromagnetic technology-based bridge cable broken wire detection and measurement system according to claim 1, wherein: the triaxial non-magnetic simulation turntable further comprises a bottom plate (1), the verification table base (2) is supported on the bottom plate (1) through a plurality of groups of base supporting nails (71) and bottom pads (81), and the verification table base (2) is fixedly connected with the bottom plate (1) through a plurality of connecting screws (91);
The bottom end of the excitation-movement-clamping integrated device (480) is connected with a disc (600) through a non-magnetic flexible connecting rod piece (601), and a plurality of spring telescopic buckles (591) are arranged on the disc (600); the base plate (1) of the triaxial nonmagnetic simulation turntable is fixed on the disc (600) through a spring telescopic buckle (591), and the relative positions of the triaxial nonmagnetic simulation turntable and the excitation-movement-clamping integrated device (480) are unchanged.
7. The electromagnetic technology-based bridge cable broken wire detection and measurement system according to claim 1, wherein: the tool (460) is in a cross shape, an inner ring slot and an outer ring slot are arranged on the tool (460), and a triaxial fluxgate sensor (461) is inserted in the inner ring slot or the outer ring slot; when the triaxial fluxgate sensor (461) is inserted into the inner ring slot, the insert block is inserted into the outer ring slot; when the triaxial fluxgate sensor (461) is inserted into the outer ring slot, an insert block is inserted into the inner ring slot; the shape of the insert block is the same as that of the triaxial fluxgate sensor (461), and the material of the insert block is the same as that of the tooling (460).
8. The measurement method of the bridge cable broken wire detection measurement system based on the electromagnetic technology according to any one of claims 1 to 7, comprising the steps of:
Step one, assembling an excitation-movement-clamping integrated device (480) on a inhaul cable; assembling a triaxial non-magnetic simulation turntable, adjusting the level of a table top (110), and inserting a triaxial fluxgate sensor (461) and an inserting block on a tool (460);
step two, the rotation angles of three rotating shafts of the triaxial nonmagnetic simulation turntable are adjusted to be 0 degrees, and the triaxial nonmagnetic simulation turntable is fixed on a disc (600) at one side of an excitation-movement-clamping integrated device (480) through a spring telescopic buckle (591);
step three, current excitation is carried out through an excitation coil (500), and a magnetic gradient tensor is obtained through a triaxial fluxgate sensor (461); the rotation angle of the platform body (340) around the axis of the left half-shaft screw rod (300) is adjusted for a plurality of times by taking 45 degrees as step length, and magnetic gradient tensors under a plurality of angles are obtained;
step four, adjusting the rotation angle of the table top (110), and repeating the step four once every 45 degrees of rotation of the table top (110) until the rotation angle of the table top (110) reaches 360 degrees;
step five, synchronously climbing the excitation-movement-clamping integrated device (480) and the triaxial nonmagnetic simulation turntable through the climbing device (520), repeating the step four to the step six every climbing for a certain unit length, and recording the distance section of the critical point of the magnetic gradient tensor change;
And step six, returning to a distance section where the critical point of the magnetic gradient tensor change is located, repeating the step three to the step five for the distance section, extracting the characteristics of the magnetic gradient tensor change through a magnetic anomaly target extraction technology, and then carrying out magnetic target identification based on multi-mode machine learning.
9. The method for measuring the bridge cable broken wire detection and measurement system based on the electromagnetic technology according to claim 8, wherein in the second step, the method for adjusting the rotation angles of three rotating shafts of the triaxial nonmagnetic simulation turntable to 0 ° is specifically as follows:
tightening the worm locking nail, loosening the Y-axis locking rod (180), and roughly adjusting the rotation angle of the table top (110); tightening a Y-axis locking rod (180), loosening a worm locking nail, and finely adjusting the rotation angle of the table top (110) through a worm hand wheel rod (160) until the Y encoder detects that the gear reading in the checking table base (2) is 0 degrees; tightening the worm locking pin and the Y-axis locking rod (180);
when the clutch hand wheel (270) is loosened and the shaft locking knob (280) is screwed, the left half shaft screw rod (300) and the right half shaft screw (320) are directly screwed manually, and the rotation angle of the platform body (340) around the axis of the left half shaft screw rod (300) is subjected to rough adjustment; the clutch hand wheel (270) is screwed down, the lock shaft knob (280) is loosened, the X worm (230) is rotated through the X worm hand wheel (240) to drive the X worm wheel (250) to conduct fine adjustment until the X encoder detects that the reading of the dial (330) is 0 degrees, and the clutch hand wheel (270) and the lock shaft knob (280) are screwed down;
Loosening the worm locking nail (370) and the worm locking nail (380), tightening the Z-axis locking rod (430), and directly and manually adjusting the rotation angle of the tool (460) around the Z axis in a rough adjustment mode; tightening the worm locking nail (370) and the worm locking nail (380), loosening the Z-axis locking rod (430), rotating the Z-axis worm (390) through the Z-axis worm hand wheel (410), and finely adjusting the rotation angle of the tool (460) around the Z axis until the Z encoder detects that the reading of the Z dial (440) is 0 degrees; the worm locking nail (370), the worm locking nail (380) and the Z-axis locking rod (430) are all screwed.
10. The method for measuring the bridge cable broken wire detection and measurement system based on the electromagnetic technology according to claim 8, wherein two groups of comparison experiments are performed, in one group of experiments, a triaxial fluxgate sensor (461) is inserted into an inner ring slot of a tool (460), and an insert block is inserted into an outer ring slot; in another set of experiments, a triaxial fluxgate sensor (461) was inserted into an outer ring slot of the tooling (460), and an insert was inserted into an inner ring slot.
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| CN202310420633.7A CN116539709A (en) | 2023-04-19 | 2023-04-19 | Bridge inhaul cable broken wire detection and measurement system and method based on electromagnetic technology |
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| CN202310420633.7A CN116539709A (en) | 2023-04-19 | 2023-04-19 | Bridge inhaul cable broken wire detection and measurement system and method based on electromagnetic technology |
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