CN111141818A - Laser strong-magnetic flat steel wire rope nondestructive flaw detection system and method - Google Patents
Laser strong-magnetic flat steel wire rope nondestructive flaw detection system and method Download PDFInfo
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- CN111141818A CN111141818A CN202010102618.4A CN202010102618A CN111141818A CN 111141818 A CN111141818 A CN 111141818A CN 202010102618 A CN202010102618 A CN 202010102618A CN 111141818 A CN111141818 A CN 111141818A
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- G01—MEASURING; TESTING
- 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
- G01N27/85—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 using magnetographic methods
Abstract
The invention relates to a laser strong magnetic flat steel wire rope nondestructive flaw detection system and a laser strong magnetic flat steel wire rope nondestructive flaw detection method, wherein the online flaw detection precision depends on the density of a laser beam, and the width of a flat steel wire rope cannot be monitored. Therefore, the laser strong-magnetism flat steel wire rope nondestructive inspection system comprises a magnetic detection sensor, a controller, a storage device, a display and a flat steel wire rope laser width measuring device, wherein the flat steel wire rope laser width measuring device comprises two box-shaped shells, a laser transmitter, a high-speed motor, a rotary prism, a rotating parallel light convex lens, a parallel light converging lens and a photoelectric sensing element, the flat steel wire rope is scanned once when the rotary prism rotates once, the photoelectric sensing element senses two adjacent pulse signals, the interval time of the two adjacent pulse signals is calculated, the width of the flat steel wire rope can be obtained, and the potential accident hazard of the flat steel wire rope can be found in advance through width change. The invention has the advantages that the precision depends on the density of the laser beam, is suitable for carrying out nondestructive inspection on the flat steel wire rope, and is suitable for various mine enterprises.
Description
Technical Field
The invention relates to a laser strong-magnetic flat steel wire rope nondestructive inspection system and a laser strong-magnetic flat steel wire rope nondestructive inspection method.
Background
Personnel and equipment enter and exit a mine in coal mining by means of a winch lifting system. When the winch lifting system works, the steel wire rope needs to bear heavy burden, and if the steel wire rope of the winch lifting system breaks, serious casualties can happen. If the steel wire rope can be found to be seriously damaged before the steel wire rope has an accident, the steel wire rope can be replaced in time before the steel wire rope has the rope breaking accident, and the serious accident can be effectively avoided.
The steel wire rope strong magnetic induction detection technology is a technology developed for hundreds of years, and has the function of nondestructively detecting the defects in the steel wire rope by a technical means, and the instrument is required to be used for detecting the damage condition of the steel wire rope in various standards and specifications at home and abroad. However, the use of wire rope flaw detectors is still not ideal.
The steel wire rope strong magnetic induction detection technology is characterized in that a magnetic field is induced on a passing steel wire rope through a strong magnet, when the conditions such as steel wire breakage, distortion, abrasion and corrosion occur outside the steel wire rope, the induced magnetic field can change, the change of the magnetic field can be detected through a magnetic sensitive element, and then the damaged part of the steel wire rope can be found out in the running process of the steel wire rope. When the steel wire of the steel wire rope is seriously abraded, the metal section of the steel wire rope also changes, the change of the metal section determines the change of the saturation magnetic flux of the steel wire rope, and the magnetic sensing element can sense the change of the saturation magnetic flux of the steel wire rope, but is not sensitive and cannot accurately and timely find the change.
The Chinese patent invention No. CN 104613884B, granted in 13.06.7.2017.A nondestructive inspection system for a laser strong-magnetic flat steel wire rope and a method thereof are disclosed, wherein the nondestructive inspection system for the laser strong-magnetic flat steel wire rope is additionally provided with a steel wire rope on-line laser diameter measuring device on the original strong-magnetic induction detection system, the instantaneous diameter of the steel wire rope is accurately calculated by a laser emitting/receiving mechanism, the average value of the outer diameter of the steel wire rope of each strand pitch is calculated, the difference value between the average value of the outer diameter of the steel wire rope and the normal outer diameter of the steel wire rope is compared, the abnormal point with the maximum diameter change of the steel wire rope and the distance between the abnormal point and the initial point of the steel wire rope are found, the local necking phenomenon of the steel. According to the invention, N laser emitting points and N photoelectric sensing elements are required to be densely and parallelly arranged near the steel wire rope, the measurement precision is limited due to the limited laser beam density caused by the influence of the volumes of the conventional laser emitter and the photoelectric sensing elements, and the device is only suitable for measuring round steel wire ropes and cannot measure flat steel wire ropes.
Therefore, it is necessary to provide a nondestructive inspection system and method for a flat wire rope with strong laser, which can measure the flat wire rope without depending on the laser beam density,
disclosure of Invention
The invention aims to solve the technical problem of how to provide a high-precision laser strong-magnetism flat steel wire rope nondestructive flaw detection system and method which are independent of laser beam density in precision and convenient for manual local rechecking.
In order to solve the technical problem, the laser strong magnetic flat steel wire rope nondestructive inspection system comprises a magnetic flaw detection sensor, a controller, a storage device and a display, and is characterized in that: the laser width measuring device comprises two box-shaped shells, a laser transmitter, a high-speed motor, a rotating prism, a rotating parallel light convex lens, a parallel light converging lens, a photoelectric sensing element, a power line and a signal line, wherein the two box-shaped shells are divided at two sides, opposite surfaces of the two box-shaped shells are respectively provided with a circular window, the rotating parallel light convex lens and the parallel light converging lens are respectively arranged on the two circular windows, the axial leads of the rotating parallel light convex lens and the rotating parallel light converging lens are horizontal and coincident, the laser transmitter, the high-speed motor and the rotating prism are arranged in the box-shaped shell where the rotating parallel light convex lens is arranged, the rotating prism is provided with M reflecting surfaces, the reflecting surfaces are uniformly encircled into a regular M prism shape, the rotating prism is vertically arranged, the axial lead of the rotating prism is vertically crossed with the axial lead of the rotating parallel light convex lens, and the rotating prism is driven by the, the laser emitter is fixed between the rotating prism and the rotating parallel light convex lens and points to the rotating prism, when the rotating prism rotates to the position that the reflecting surface adjacent to the rotating parallel light convex lens is perpendicular to the axial lead of the rotating parallel light convex lens, the center of the reflecting surface is just positioned on the focal point of the rotating parallel light convex lens, the laser beam emitted by the laser emitter points to the focal point, the photoelectric sensing element is connected with the signal input end of the controller, wherein M is a positive integer and is more than or equal to 5 and less than or equal to 8. So design, through the rotation prism every time rotated the one side, the flat wire rope of scanning once, photoelectric sensing element senses two adjacent pulse signals, calculates two adjacent pulse signal's interval time relatively, can reachs flat wire rope's width, through the width change, can discover unusually, in time artifical maintenance anomaly point, in time change wire rope when necessary.
Preferably, the magnetic flaw detection sensor comprises a shell, the shell is cylindrical, a U-shaped groove is formed in the shell, four corners of side walls of two sides of the U-shaped groove are respectively embedded with a piece of strong magnet, the strong magnets are arranged in two rows and two columns on the side walls of the U-shaped groove, 3 magnetic sensitive elements which are uniformly distributed from top to bottom are embedded in the side walls between the two rows of strong magnets, signal wires of the magnetic sensitive elements are led out of the shell and are connected with a magnetic induction signal input end of a controller through an A/D (analog/digital) conversion circuit, two rollers are fixed on the top of the shell and are respectively arranged on two sides of the U-shaped groove, axial wires of the two rollers are parallel to the side walls of the U-shaped groove, at least one roller is a speed measurement roller, and a signal output end of the speed. By the design, the structure is vertical and compact, and the device is suitable for carrying out strong-magnetic nondestructive flaw detection on the flat steel wire rope.
Preferably, the shell is fixed on a transverse sliding block, the transverse sliding block is arranged on a transverse sliding rail, the transverse sliding rail is fixed on a longitudinal sliding block, the longitudinal sliding block is arranged on two longitudinal sliding rails, the two longitudinal sliding rails are fixed on a square frame, the transverse sliding block and the longitudinal sliding block are respectively provided with a notch, a flat steel wire rope can enter the notches, a transverse electric push rod is arranged between the transverse sliding block and the longitudinal sliding block, and a longitudinal electric push rod is arranged between the longitudinal sliding block and the square frame. The control signal input ends of the transverse electric push rod and the longitudinal electric push rod are respectively connected with the control signal input end of the controller. By the design, the installation and regulation are convenient.
Preferably, the photoelectric sensing element is a photoresistor. So design, it is effectual.
Preferably, the rotating speed of the high-speed motor is more than or equal to 15000 r/min. Of course, the higher the rotation speed, the faster the flat wire rope can move during detection. Taking a hexagonal rotating prism as an example, it is estimated that if a motor of 15000 rpm is used, the moving speed of the flat wire rope should not exceed 0.1 m/s. High speed motors with rotational speeds up to 15 kilo revolutions per minute have been present in the prior art. By the design, the flat steel wire rope does not need to move too slowly.
The method for carrying out the on-line flaw detection on the flat steel wire rope by the laser strong-magnetism flat steel wire rope nondestructive flaw detection system comprises the following steps:
①, fixing the square frame around the flat steel wire rope, making the flat steel wire rope in the center of the square frame, making the flat steel wire rope parallel to the side wall plane of the U-shaped groove, firstly adjusting the transverse electric push rod to make the vertical bisector of the flat steel wire rope coincide with the bisector of the U-shaped groove, then adjusting the longitudinal electric push rod to make the U-shaped groove just cover the flat steel wire rope, finally adjusting the transverse electric push rod to make the speed measuring roller lean against one side of the flat steel wire rope, and can rotate along with the movement of the flat steel wire rope, and marking or recording the starting point of the flat steel wire rope;
②, starting the elevator matched with the flat wire rope, starting the laser strong magnetic flat wire rope nondestructive inspection system, automatically starting the high-speed motor and the laser emitter by the controller, driving the rotating prism to rotate at a constant high speed by the high-speed motor, scanning the flat wire rope by the reflected laser once when the rotating prism rotates one side,
every time of scanning, the photoelectric sensing element receives two adjacent pulse electric signals, and the controller calculates the termination time Tn of the previous pulse electric signal and the starting time Tn of the next pulse electric signal in the two adjacent pulse electric signals/The time difference between them, i.e. Tn-Tn/△ Tn, using △ Tn to represent the width of the steel wire rope, calculating the accumulated displacement Ln of the flat steel wire rope from the opening time to (Tn + △ Tn/2) of the hoist matched with the flat steel wire rope according to the speed signal transmitted by the speed measuring roller and the accumulated passing time, wherein n is a positive integer used for marking the sequence of the measuring pulse,
③, after all flat steel wire ropes to be detected are detected, the hoist matched with the flat steel wire ropes is stopped, and the controller automatically calculates the arithmetic mean △ T of all the △ Tn detected0And find the smallest △ T value, i.e., △ TminAt △ T0And △ TminOne-half of the difference between the standard deviation and the arithmetic mean △ T is found0△ Tn with the difference value larger than the standard abnormal difference value is used as the width abnormal point, the accumulated displacement Ln of the flat steel wire rope corresponding to all the abnormal points is found out as the abscissa set I of the width abnormal point,
the magnetic induction signal detected by the magnetic damage detection sensor is used as a vertical coordinate, the accumulated displacement Ln of the flat steel wire rope is used as a horizontal coordinate to form a two-dimensional full curve of the magnetic induction signal of the flat steel wire rope, the controller scans the two-dimensional full curve of the magnetic induction signal of the flat steel wire rope, an abnormal waveform image section and the accumulated displacement Ln of the flat steel wire rope corresponding to the abnormal waveform image are found out to be used as a horizontal coordinate set II of the magnetic induction abnormal point,
combining the abscissa set I of the width abnormal points and the abscissa set II of the magnetic induction abnormal points to obtain the abscissa set of the width or magnetic induction abnormal points, taking all Ln values corresponding to the width or magnetic induction abnormal points as the abscissas, and △ Tn corresponding to the width or magnetic induction abnormal points as the ordinates, forming a two-dimensional width curve graph of the flat steel wire rope of the width or magnetic induction abnormal points, and simultaneously displaying abnormal waveform segments corresponding to the width or magnetic induction abnormal points on the two-dimensional width curve graph of the flat steel wire rope of the width or magnetic induction abnormal points,
④, displaying the two-dimensional graph of the width or the width of the flat wire rope at the magnetic induction abnormal point on the display, and displaying the vertical coordinate of △ T on the two-dimensional graph of the width or the width of the flat wire rope at the magnetic induction abnormal point0Represents the arithmetic mean △ T of all △ Tn by forming a horizontal line with all points of0And starting a hoist matched with the flat steel wire rope by a worker, manually checking different sections of the flat steel wire rope corresponding to the width or magnetic induction abnormal points by contrasting a display, and comprehensively judging whether the flat steel wire rope needs to be replaced or maintained. By the design, the measurement precision does not depend on the density of the laser beam, and the installation and the assembly are convenient.
As an optimization, step ③ finds the minimum △ T value, i.e., △ TminThen △ T is calculated firstminWhether less than or equal to 90% △ T0If △ Tmin＞90％△T0Continuing to record the operation step in step ③, if △ Tmin≤90％△T0And then an alarm is given immediately, and a cage of the hoister matched with the flat steel wire rope is stopped nearby underground or at the wellhead, and workers in the elevator are evacuated quickly and overhauled immediately, so that casualties are avoided. So designed, the flat wire rope width reduces 10%, means that the flat wire rope has appeared disconnected strand or severe necking, and extremely dangerous, should stop using immediately.
The laser strong-magnetic flat steel wire rope nondestructive flaw detection system and method provided by the invention have the advantages of independent precision on laser beam density, convenience for manual local recheck, high precision, convenience for assembly and production, and are suitable for various mining enterprises.
Drawings
The laser strong magnetic flat steel wire rope nondestructive inspection system and method of the invention are further explained with the following drawings:
FIG. 1 is a circuit line frame diagram of the laser strong magnetic flat steel wire rope nondestructive inspection system;
FIG. 2 is a schematic diagram of the flat wire rope laser width measuring device of the laser strong magnetic flat wire rope nondestructive inspection system when the flat wire rope is not scanned;
FIG. 3 is a schematic diagram of the laser beam of FIG. 2 refracted through a parallel light converging lens and a parallel light converging lens to a photo-electric sensing element;
FIG. 4 is a schematic view of the laser beam of FIG. 3 further moved and refracted by the parallel light converging lens and then blocked by an edge of one side of the flat wire rope;
FIG. 5 is a schematic diagram of the laser beam of FIG. 4 further moved and refracted by the parallel light converging lens and blocked by the edge of the other side of the flat wire rope;
FIG. 6 is a schematic diagram of the laser beam of FIG. 4 further moving, leaving the other side edge of the flat wire rope, and being refracted to the photo-electric sensing element by the parallel light converging lens and the parallel light converging lens;
FIG. 7 is a schematic diagram of photoelectric pulse signals generated by the laser beam emitted by the laser emitter of the flat wire rope laser width measuring device of the laser strong magnetic flat wire rope nondestructive inspection system;
FIG. 8 is a schematic diagram of a two-dimensional curve of the width of the flat wire rope with magnetic induction anomaly points displayed on a display when the laser strong magnetic flat wire rope nondestructive inspection system works;
FIG. 9 is a schematic perspective view of the housing, U-shaped groove, strong magnet, magnetic sensor and roller of the laser strong magnetic flat wire rope nondestructive inspection system;
FIG. 10 is a schematic top view of the housing, U-shaped groove, roller, transverse slide block, transverse slide rail, longitudinal slide block, longitudinal slide rail and square frame of the laser strong magnetic flat wire rope nondestructive inspection system.
In the figure: 1 is a magnetic damage detection sensor, 2 is a controller, 3 is a storage device, 4 is a display, 5 is a box-shaped shell, 6 is a laser emitter, 7 is a high-speed motor, 8 is a rotating prism, 9-turn parallel light convex lens, 10 is a parallel light converging lens, 11 is a photoelectric sensing element, 101 is a shell, 102 is a U-shaped groove, 12 is a strong magnet, and,103 is a magnetic sensitive element, 104 is a roller, 105 is a transverse sliding block, 106 is a transverse sliding rail, 107 is a longitudinal sliding block, 108 is a longitudinal sliding rail, 109 is a square frame, 13 is a flat steel wire rope, 14 is a transverse electric push rod, 15 is a longitudinal electric push rod, Tn is the termination time of the previous pulse electric signal/The start time of the next pulse electric signal, △ Tn the interval time between the front and back adjacent pulse electric signals, △ TminThe shortest interval time between the front and rear adjacent pulse electric signals, Ln the cumulative displacement of the flat wire rope, 16 the wire, 17 the laser beam.
Detailed Description
The first implementation mode comprises the following steps: referring to fig. 1-10, the laser strong magnetic flat wire rope nondestructive inspection system comprises a magnetic inspection sensor 1, a controller 2, a storage device 3 and a display 4, as shown in fig. 1.
The method is characterized in that: the laser width measuring device comprises two box-shaped shells 5, a laser transmitter 6, a high-speed motor 7, a rotating prism 8, a rotating parallel light convex lens 9, a parallel light converging lens 10, a photoelectric sensing element 11 and necessary cables, wherein the two box-shaped shells 5 are arranged on two sides, opposite surfaces of the two box-shaped shells are respectively provided with a circular window, the rotating parallel light convex lens 9 and the parallel light converging lens 10 are respectively arranged on the two circular windows, the axial leads of the rotating parallel light convex lens 9 and the parallel light converging lens 10 are horizontal and coincident, the laser transmitter 6, the high-speed motor 7 and the rotating prism 8 are arranged in the box-shaped shell where the rotating parallel light convex lens 9 is arranged, the rotating prism 8 is provided with M reflecting surfaces, the reflecting surfaces uniformly surround into a positive M prism shape, the rotating prism 8 is vertically arranged, and the axial lead of the rotating parallel light convex lens 9 is vertically crossed with the axial lead of the rotating parallel light convex, the rotating prism 8 is driven by a high-speed motor 7, the laser emitter 6 is fixed between the rotating prism 8 and the rotating parallel light convex lens 9, the laser emitter 6 points to the rotating prism 8, when the rotating prism 8 rotates to the position where the reflecting surface adjacent to the rotating parallel light convex lens 9 is perpendicular to the axial lead of the rotating parallel light convex lens 9, the center of the reflecting surface is just positioned on the focal point of the rotating parallel light convex lens 9, the laser beam emitted by the laser emitter 6 points to the focal point, the photoelectric sensing element 11 is connected with the signal input end of the controller, wherein M is a positive integer, and M is more than or equal to 5 and less than or equal to 8. As shown in the figures 2-6 of the drawings,
the magnetic flaw detection sensor 1 comprises a shell 101, the shell 101 is cylindrical, a U-shaped groove 102 is arranged on the shell, four corners of the side walls of two sides of the U-shaped groove 102 are respectively embedded with a strong magnet 12, the strong magnets 12 are arranged in two rows and two columns on the side wall of the U-shaped groove 102, 3 magnetic sensitive elements 103 which are uniformly arranged from top to bottom are embedded on the side wall between the two rows of strong magnets 12, signal wires (not shown in the figure) of the magnetic sensitive elements 103 are led out of the shell 101, and is connected with the magnetic induction signal input end of the controller 2 through an A/D conversion circuit (not shown in the figure), two rollers 104 are fixed on the top of the shell 101, the two rollers 104 are arranged at two sides of the U-shaped groove, the axial lines of the rollers are all parallel to the side walls of the U-shaped groove 102, at least one roller is a tachometer roller, the signal output end of the speed measuring roller is connected with the speed signal input end of the flat wire rope of the controller 2. As shown in fig. 9.
The shell 101 is fixed on a transverse sliding block 105, the transverse sliding block 105 is arranged on a transverse sliding rail 106, the transverse sliding rail 106 is fixed on a longitudinal sliding block 107, the longitudinal sliding block 107 is arranged on two longitudinal sliding rails 108, the two longitudinal sliding rails 108 are fixed on a square frame 109, the transverse sliding block 105 and the longitudinal sliding block 107 are respectively provided with a notch, a flat steel wire rope 13 can enter the notches, a transverse electric push rod 14 is arranged between the transverse sliding block 105 and the longitudinal sliding block 107, and a longitudinal electric push rod 15 is arranged between the longitudinal sliding block 107 and the square frame 109. The control signal input ends of the transverse electric push rod 14 and the longitudinal electric push rod 15 are respectively connected with the control signal input end of the controller 2. As shown in fig. 10.
The photoelectric sensing element 11 is a photoresistor. The rotating speed of the high-speed motor 7 is more than or equal to 15000 r/min.
The method for carrying out online flaw detection on the flat steel wire rope by using the laser strong-magnetism flat steel wire rope nondestructive flaw detection system in the first embodiment comprises the following steps:
①, fixing the square frame 109 on the periphery of the flat wire rope 13, making the flat wire rope 13 located in the center of the square frame, making the flat wire rope 13 parallel to the side wall plane of the U-shaped groove 102, firstly adjusting the transverse electric push rod 14, making the vertical plane of the flat wire rope 13 coincide with the plane of the U-shaped groove 102, then adjusting the longitudinal electric push rod 15, making the U-shaped groove 102 just fit on the flat wire rope 13, finally adjusting the transverse electric push rod 14, making the speed measuring roller abut against the side surface of one side of the flat wire rope 13, and rotating along with the movement of the flat wire rope 13, and marking or recording the starting point of the flat wire rope 13;
②, starting a hoist (not shown) for the flat wire 13, starting the laser strong magnetic flat wire nondestructive inspection system, the controller 2 automatically starting the high speed motor 7 and the laser emitter 6, the high speed motor 7 driving the rotating prism 8 to rotate at a constant high speed, the reflected laser scans the flat wire 13 once when the rotating prism 8 rotates one side,
every time of scanning, the photoelectric sensing element 11 receives two adjacent pulse electrical signals, the controller 2 calculates a time difference between a termination time Tn of a previous pulse electrical signal and a start time Tn/of a next pulse electrical signal in the two adjacent pulse electrical signals, namely Tn-Tn/═ △ Tn, the width of the steel wire rope is measured by using △ Tn representation, the accumulated displacement Ln of the flat steel wire rope from the starting time of a hoist matched with the flat steel wire rope 13 to (Tn + △ Tn/2) is calculated according to the speed signal transmitted by the speed measuring roller and the accumulated elapsed time, wherein n is a positive integer and is used for marking the order of measuring pulses, as shown in fig. 7.
③, after all the flat steel wire ropes 13 to be detected are detected, the hoist used in the flat steel wire ropes 13 is stopped, and the controller 2 automatically calculates the arithmetic mean △ T of all the △ Tn detected0And find the minimum △ T value, i.e., △ Tmin, at △ T0And △ TminOne-half of the difference between the standard deviation and the arithmetic mean △ T is found0△ Tn with the difference value larger than the standard abnormal difference value is used as the width abnormal point, and the accumulated displacement Ln of the flat wire rope 13 corresponding to all the abnormal points is found as the abscissa set I of the width abnormal point.
And the magnetic induction signal detected by the magnetic flaw detection sensor is used as a vertical coordinate, the accumulated displacement Ln of the flat steel wire rope 13 is used as a horizontal coordinate, a two-dimensional full curve of the flat steel wire rope magnetic induction signal is formed, the controller 2 scans the two-dimensional full curve of the flat steel wire rope magnetic induction signal, and an abnormal waveform image segment and the accumulated displacement Ln of the flat steel wire rope corresponding to the abnormal waveform image are found out and used as an horizontal coordinate set II of the magnetic induction abnormal point.
Combining the abscissa set I of the width abnormal points and the abscissa set II of the magnetic induction abnormal points to obtain the abscissa set of the width or the magnetic induction abnormal points, taking all Ln values corresponding to the width or the abscissa set of the magnetic induction abnormal points as abscissas, and △ Tn corresponding to the width or the magnetic induction abnormal points as ordinates, forming a two-dimensional width curve graph of the flat steel wire rope of the width or the magnetic induction abnormal points, and simultaneously displaying abnormal waveform graph segments corresponding to the width or the magnetic induction abnormal points on the two-dimensional width curve graph of the flat steel wire rope of the width or the magnetic induction abnormal points.
④, displaying the two-dimensional graph of the width or the width of the flat wire rope at the magnetic induction abnormal point on the display, and displaying the vertical coordinate of △ T on the two-dimensional graph of the width or the width of the flat wire rope at the magnetic induction abnormal point0Represents the arithmetic mean △ T of all △ Tn by forming a horizontal line with all points of0And starting a hoist matched with the flat steel wire rope by a worker, manually checking different sections on the flat steel wire rope 13 corresponding to each width or magnetic induction abnormal point by contrasting a display, and comprehensively judging whether the flat steel wire rope 13 needs to be replaced or maintained. As shown in fig. 8.
As an optimization, step ③ finds the minimum △ T value, i.e., △ TminThen △ T is calculated firstminWhether less than or equal to 90% △ T0If △ Tmin＞90％△T0Continuing to record the operation step in step ③, if △ Tmin≤90％△T0An alarm is given immediately, and a cage of a hoist matched with a flat steel wire rope 13 (not shown in the figure) is stopped nearby underground or at the wellhead, and workers in the cage are evacuated quickly and overhauled immediately to avoid casualties.
Claims (7)
1. The utility model provides a strong magnetism flat wire rope nondestructive test system of laser, includes magnetism and surveys sensor, controller, storage device and display, its characterized in that: the laser width measuring device comprises two box-shaped shells, a laser transmitter, a high-speed motor, a rotating prism, a rotating parallel light convex lens, a parallel light converging lens and a photoelectric sensing element, wherein the two box-shaped shells are divided into two sides, opposite surfaces of the two box-shaped shells are respectively provided with a circular window, the rotating parallel light convex lens and the parallel light converging lens are respectively arranged on the two circular windows, the axial leads of the rotating parallel light convex lens and the rotating parallel light converging lens are horizontal and coincident, the laser transmitter, the high-speed motor and the rotating prism are arranged in the box-shaped shell in which the rotating parallel light convex lens is arranged, the rotating prism is provided with M reflecting surfaces, the reflecting surfaces are uniformly enclosed into a positive M prism shape, the rotating prism is vertically arranged, the axial lead of the rotating parallel light convex lens is vertically crossed with the axial lead of the rotating parallel light convex lens, the rotating prism is driven by the high-speed motor, the laser transmitter is fixed between the rotating prism, and the laser emitter points to the rotating prism, when the rotating prism rotates to the position that the reflecting surface adjacent to the rotating parallel light convex lens is perpendicular to the axial lead of the rotating parallel light convex lens, the center of the reflecting surface is just positioned on the focal point of the rotating parallel light convex lens, a laser beam emitted by the laser emitter points to the focal point, and the photoelectric sensing element is connected with the signal input end of the controller, wherein M is a positive integer, and M is more than or equal to 5 and less than or equal to 8.
2. The laser strong magnetic flat wire rope nondestructive inspection system according to claim 1, characterized in that: the magnetic flaw detection sensor comprises a shell, wherein the shell is cylindrical, a U-shaped groove is formed in the shell, strong magnets are embedded in four corners of side walls of two sides of the U-shaped groove respectively, the strong magnets are arranged in two rows and two columns on the side wall of the U-shaped groove, 3 magnetic sensitive elements which are uniformly distributed from top to bottom are embedded in the side wall between the two columns of the strong magnets, signal wires of the magnetic sensitive elements are led out of the shell and are connected with a magnetic induction signal input end of a controller through an A/D conversion circuit, two rollers are fixed at the top of the shell and are respectively arranged on two sides of the U-shaped groove, axial leads of the rollers are parallel to the side wall of the U-shaped groove, at least one roller is a speed measurement roller, and a signal output end of the speed measurement roller is connected with a.
3. The laser strong magnetic flat wire rope nondestructive inspection system according to claim 2, characterized in that: the shell is fixed on a transverse sliding block, the transverse sliding block is arranged on a transverse sliding rail, the transverse sliding rail is fixed on a longitudinal sliding block, the longitudinal sliding block is arranged on two longitudinal sliding rails, the two longitudinal sliding rails are fixed on a square frame, the transverse sliding block and the longitudinal sliding block are respectively provided with a notch, a flat steel wire rope can enter the notches, a transverse electric push rod is arranged between the transverse sliding block and the longitudinal sliding block, and a longitudinal electric push rod is arranged between the longitudinal sliding block and the square frame. The control signal input ends of the transverse electric push rod and the longitudinal electric push rod are respectively connected with the control signal input end of the controller.
4. The laser strong magnetic flat wire rope nondestructive inspection system according to claim 1, characterized in that: the photoelectric sensing element is a photoresistor.
5. The laser strong magnetic flat wire rope nondestructive inspection system according to claim 1, characterized in that: the rotating speed of the high-speed motor is more than or equal to 15000 r/min.
6. The method for carrying out the on-line flaw detection of the flat wire rope by using the laser strong magnetic flat wire rope nondestructive flaw detection system of claim 3 comprises the following steps:
①, fixing the square frame of claim 3 around the flat wire rope, making the flat wire rope in the center of the square frame and parallel to the side wall plane of the U-shaped groove, adjusting the transverse electric push rod to make the vertical bisector of the flat wire rope coincide with the bisector of the U-shaped groove, then adjusting the longitudinal electric push rod to make the U-shaped groove just cover the flat wire rope, finally adjusting the transverse electric push rod to make the speed measuring roller lean against one side of the flat wire rope and rotate along with the movement of the flat wire rope, and marking or recording the starting point of the flat wire rope;
②, starting the elevator matched with the flat wire rope, starting the laser strong magnetic flat wire rope nondestructive inspection system, automatically starting the high-speed motor and the laser emitter by the controller, driving the rotating prism to rotate at a constant high speed by the high-speed motor, scanning the flat wire rope by the reflected laser once when the rotating prism rotates one side,
every time of scanning, the photoelectric sensing element receives two adjacent pulse electric signals, and the controller calculates the termination time Tn of the previous pulse electric signal and the starting time Tn of the next pulse electric signal in the two adjacent pulse electric signals/The time difference between them, i.e. Tn-Tn/△ Tn, using △ Tn to represent the width of the steel wire rope, calculating the accumulated displacement Ln of the flat steel wire rope from the opening time to (Tn + △ Tn/2) of the hoist matched with the flat steel wire rope according to the speed signal transmitted by the speed measuring roller and the accumulated passing time, wherein n is a positive integer used for marking the sequence of the measuring pulse,
③, after all flat steel wire ropes to be detected are detected, the hoist matched with the flat steel wire ropes is stopped, and the controller automatically calculates the arithmetic mean △ T of all the △ Tn detected0And find the minimum △ T value, i.e., △ Tmin, at △ T0And △ TminOne-half of the difference between the standard deviation and the arithmetic mean △ T is found0△ Tn with the difference value larger than the standard abnormal difference value is used as the width abnormal point, the accumulated displacement Ln of the flat steel wire rope corresponding to all the abnormal points is found out as the abscissa set I of the width abnormal point,
the magnetic induction signal detected by the magnetic damage detection sensor is used as a vertical coordinate, the accumulated displacement Ln of the flat steel wire rope is used as a horizontal coordinate to form a two-dimensional full curve of the magnetic induction signal of the flat steel wire rope, the controller scans the two-dimensional full curve of the magnetic induction signal of the flat steel wire rope, an abnormal waveform image section and the accumulated displacement Ln of the flat steel wire rope corresponding to the abnormal waveform image are found out to be used as a horizontal coordinate set II of the magnetic induction abnormal point,
combining the abscissa set I of the width abnormal points and the abscissa set II of the magnetic induction abnormal points to obtain the abscissa set of the width or magnetic induction abnormal points, and calculating the abscissa set of the width or magnetic induction abnormal pointsAll corresponding Ln values are abscissa, △ Tn corresponding to the width or magnetic induction abnormal point is ordinate, a two-dimensional graph of the width or magnetic induction abnormal point flat steel wire rope width is formed, and the ordinate is △ T displayed on the two-dimensional graph of the width or magnetic induction abnormal point flat steel wire rope width0Represents the arithmetic mean △ T of all △ Tn by forming a horizontal line with all points of0Meanwhile, abnormal waveform segments corresponding to each width or magnetic induction abnormal point are displayed on the two-dimensional width curve graph of the flat steel wire rope at the width or magnetic induction abnormal point,
④, displaying the two-dimensional curve chart of the width of the flat steel wire rope at the abnormal magnetic induction points on a display, starting a hoist matched with the flat steel wire rope by a worker, checking different sections of the flat steel wire rope corresponding to the abnormal magnetic induction points by the worker according to the display, and comprehensively judging whether the flat steel wire rope needs to be replaced or maintained.
7. The method for flaw detection of flat wire rope on line by using the laser strong magnetic flat wire rope nondestructive flaw detection system according to claim 6, wherein after finding out the minimum △ T value (△ Tmin) in the ③ th step, △ T is calculatedminWhether less than or equal to 90% of △ T0, if △ Tmin＞90％△T0Continuing to record the operation step in step ③, if △ Tmin≤90％△T0And then an alarm is given immediately, and a cage of the hoister matched with the flat steel wire rope is stopped nearby underground or at the wellhead, and workers in the elevator are evacuated quickly and overhauled immediately, so that casualties are avoided.
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| CN112284256A (en) * | 2020-11-17 | 2021-01-29 | 深圳市道通科技股份有限公司 | Method and system for measuring plane abrasion of workpiece |
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| CN112284256A (en) * | 2020-11-17 | 2021-01-29 | 深圳市道通科技股份有限公司 | Method and system for measuring plane abrasion of workpiece |
| CN112284256B (en) * | 2020-11-17 | 2022-06-10 | 深圳市道通科技股份有限公司 | Method and system for measuring plane abrasion of workpiece |
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