Wire rope double circuit magnetic flaw detection sensor

Abstract

The present invention provides a double-circuit magnetic flaw detection sensor for steel wire rope, including a magnetic field generating module, a magnetic field detecting module, a DC signal preprocessing module, an AC signal adder, a DC signal processing module, a single-chip analog-to-digital conversion module, a power supply module, and a host computer intelligent processing module display module; it first evaluates the wear condition of the entire steel wire rope by measuring the diameter change of the steel wire rope as a whole, intelligently sets the basic parameters of the flaw detection software, and then performs fine detection, and finally achieves the purpose of accurately measuring the internal and external damage of the steel wire rope, and can monitor the transmission speed of the sensor to the measured steel wire rope damage signal, and realize the quantification of the steel wire rope damage signal by querying the signal standard in the database in combination with the size of the damage signal. The present invention works stably and reliably, has a wide range of practical applications, greatly improves the measurement sensitivity and accuracy, and makes it easier and more accurate to find the damage condition of the steel wire rope, and realizes the quantification of the steel wire rope damage.

Description

Technical Field

[0001] The invention belongs to the technical field of sensors, and in particular relates to a double-circuit magnetic flaw detection sensor for steel wire ropes. Background Art

[0002] At present, with the rapid development of industry and service industry, the application fields of wire rope (for example: mines, cableways, lifting equipment, elevators, port machinery, cable bridges, etc.) are also expanding, but this is also accompanied by the increasingly prominent safety hazards of wire ropes. Therefore, the requirements for flaw detection of wire ropes are becoming more and more stringent. The domestic magnetic flaw detection principles can be mainly divided into two types: weak magnetic detection and strong magnetic detection. For example, Luoyang TCK and TST use weak magnetic detection, while Shanghai Qiehua and Huazhong University of Science and Technology use strong magnetic detection. However, the detection methods used by these manufacturers have some defects to varying degrees: for example: First, there is a deviation in the uniformity of the wire rope itself, resulting in false alarms during the measurement process; second, the wire rope will have different degrees of jitter during operation, which will cause deviations in the detection results of the sensor; third, the wire rope

[0003] Under the same damage conditions, internal damage has a smaller magnetic flux leakage, while external damage has a larger magnetic flux leakage. These factors make it difficult for this type of flaw detection sensor to quantify wire rope damage. Fourth, there is a large amount of residual magnetism after the wire rope is tested, which affects the next test. Summary of the invention

[0004] In view of the above situation, the purpose of the present invention is to provide a dual-circuit magnetic flaw detection sensor for wire rope, which uses a positive and a negative continuous magnetic field to detect the wire rope, so that the residual magnetism of the wire rope after detection is much smaller, which can effectively overcome the influence of the wire rope's own jitter on the measurement result.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a double-circuit magnetic flaw detection sensor for wire rope, which is composed of a sensor detection module, a sensor control module, and an intelligent processing module of a sensor host computer; wherein the sensor detection module is composed of a magnetic field generating module and a magnetic field detecting module; the sensor control module includes a DC signal detection preprocessing module, an AC signal adder module, a DC signal adder, a DC signal differential amplifier circuit, a single-chip analog-to-digital conversion module, and a power supply module; wherein the control module of the sensor implements two sets of processing circuits, when the excitation source is a DC power supply, the signal generated by the detection module is transmitted to the DC signal detection preprocessing module, and then enters the DC signal adder, the DC signal differential amplifier circuit, and the single-chip analog-to-digital conversion module; when the excitation source is an AC power supply, the signal generated by the detection module is transmitted to the AC signal adder module, and then enters the single-chip analog-to-digital conversion module, and finally is transmitted by the single-chip analog-to-digital conversion module

[0006] Intelligent processing module of the sensor host computer.

[0007] The flaw detection sensor generates an alternating magnetic field or a direct current magnetic field by an excitation module; in the detection module, when the defect of the wire rope passes through the Hall element, the Hall element will perform magnetic extraction detection on the inside of the wire rope in the measurement area; when the excitation source in the AC signal adder is an AC signal, the two Hall element acquisition signals in the detection module are summed, and then the two summed values ​​are averaged, and the diameter change of the overall measured wire rope is obtained by querying the database, and then the wear condition of the entire wire rope is evaluated; the detection module processes the signal, firstly, the external interference waveform of the wire rope acquired by the Hall element is filtered through the DC signal preprocessing module to avoid interference with the detection of the wire rope damage signal; the signals extracted by the four groups of Hall elements are added and summed by the adder, which can effectively shield the jitter interference in the signal; the DC signal differential amplification output module subtracts the two groups of summed signals and amplifies and outputs them, and at the same time, filters out the common mode interference in the signal and amplifies the useful signal in proportion; in addition, it can also offset the temperature drift of the Hall element during the measurement process and improve the signal-to-noise ratio of the acquisition signal. The single-chip data analog-to-digital conversion module receives the wire rope defect signal and wire rope diameter signal from the AC signal adder and the DC signal differential amplifier output module, converts them into digital signals, and transmits them to the host computer data intelligent processing and display module; the host computer data intelligent processing and display module displays, analyzes, calculates, organizes, stores, generates reports, etc. The power module also provides power for the detection module, the excitation coil drive module, and the single-chip data analog-to-digital conversion module.

[0008] The magnetic field generating module comprises an excitation coil and an E-shaped silicon steel sheet bracket, wherein two groups of E-shaped silicon steel sheets and six groups of excitation coils constitute the excitation part of the sensor, the three ends of the E-shaped silicon steel sheets are cut into semicircular grooves, the upper and lower E-shaped silicon steel sheets are completely butted together, and a complete hollow circle is formed in the middle for passing the measured wire rope; six excitation coils are respectively wound around the three ends of the two E-shaped rail sheets, and after the excitation source is applied, four stable magnetic fields of equal size and same direction at the top and bottom, and equal size and opposite direction at the left and right can be formed on the E-shaped silicon steel sheets and the wire rope, wherein the winding direction of the two side excitation coils is opposite to the winding direction of the middle excitation coil.

[0009] The magnetic field detection module comprises a wedge-shaped silicon steel sheet group, a horseshoe-shaped silicon steel sheet group and a Hall element, wherein the U-mouths of two horseshoe-shaped silicon steel sheet groups are butted together to form a circular hole for passing a steel wire rope, a Hall element is placed on the top of each horseshoe-shaped silicon steel sheet group, the top of the wedge-shaped silicon steel sheet group is connected to the other side of the Hall element, and the bottom of the wedge-shaped silicon steel sheet group is connected to the concave part of the E-shaped silicon steel sheet group in the magnetic field generating module; the horseshoe-shaped silicon steel sheet group is used to assist the Hall element in extracting magnetic lines of force from the steel wire rope, and the degree of damage to the steel wire rope is determined by detecting the strength of the extracted magnetic lines of force.

[0010] During the detection, the magnetic field detection module is combined with the magnetic field generation module, wherein a group of horseshoe-shaped silicon steel sheets are placed in each of the two excitation coils of the magnetic field generation module, and a Hall element is placed at the tip of the horseshoe-shaped silicon steel sheet group, wherein the surface A of the Hall element is connected to the E-type silicon steel sheet group with a wedge-shaped silicon steel sheet group, which is used to extract the magnetic lines of force in the wire rope. When the damage passes through the sensor, the interval between Hall element I and Hall element II is fixed, and the time for the defect signal to pass through Hall element I and Hall element II is measurable, so that the speed at which the wire rope damage passes through the sensor can be calculated, and the size of the wire rope damage can be accurately obtained by querying the damage database stored in the host computer through the waveform size and speed, thereby realizing the quantification of the degree of wire rope damage.

[0011] 1. Overall AC detection

[0012] In the magnetic field generating module, the coils wound by the E-type silicon steel sheets in the upper part are, from left to right, the excitation coil A, the excitation coil C and the excitation coil B; the coils wound by the E-type silicon steel sheets in the lower part are, from left to right, the excitation coil D, the excitation coil E and the excitation coil F; an AC power source is applied to the excitation coil A on the E-type silicon steel sheet, and an AC power source with a phase difference of 180° is applied to the excitation coil B, and the excitation coil C is not connected to the excitation source; the measurement results obtained by the Hall element I and the Hall element III are summed, and the measurement results obtained by the Hall element II and the Hall element IV are summed. The measurement results are summed; the average of the two summed values ​​is taken and compared with the reference data in the sensor host computer to obtain the diameter data of the wire rope. At the same time, the residual magnetism on the wire rope is cleared to prepare for the sensor's accurate flaw detection; by comparing the data in the database, it is used to judge the overall wear of the wire rope and set the basic parameters of the flaw detection software; during the detection, the measurement results obtained by Hall element I and Hall element III are summed, and the measurement results obtained by Hall element II and Hall element IV are summed to effectively offset the influence of the wire rope's own jitter on the sensor.

[0013] 2. Accurate DC detection

[0014] The same-direction DC power supply is applied to the three groups of excitation coils (excitation coil A, excitation coil B and excitation coil C) of the E-type silicon steel sheet. Since the winding direction of the excitation coils on both sides is opposite to that of the middle excitation coil, two constant magnetic fields of equal magnitude and opposite directions are formed in the measuring area of ​​the wire rope; it is assumed that the magnetic lines of force generated by the excitation coils A and B that enter the wire rope are positive magnetic lines of force, and the magnetic lines of force generated by the excitation coil C that enter the wire rope are negative magnetic lines of force; when the wire rope is not damaged, the Hall element is affected by the magnetic lines of force generated by the left and right coils, and the positive and negative magnetic lines of force cancel each other out, resulting in the output of the Hall element being the basic potential.

[0015] When the wire rope damage moves from the excitation coil A to the excitation coil B: When the damage moves from the excitation coil A to the Hall element I, the amount of magnetic lines of force generated by the excitation coil A entering the Hall element (Hall element I and Hall element III) will decrease, while the amount of magnetic lines of force generated by the excitation coil C entering the Hall element (Hall element I and Hall element III) will not change, so that the magnetic lines of force entering the Hall element (Hall element I and Hall element III) will be unbalanced (negative magnetic lines of force become the dominant magnetic lines of force), and as the damage gradually approaches the Hall element, this will cause the sum of the magnetic lines of force extracted from the wire rope by the Hall element I and the Hall element III to gradually present a negative magnetic line state, that is, the sum of the electromotive force converted by the Hall element I and the Hall element III will also gradually decrease. When the damage enters the Hall element I, it directly leads to an overall decrease in the ability of the Hall element (Hall element I and Hall element III) to extract magnetic lines of force, forming a short transition zone. When the damage extends from Hall element I to the excitation coil C, the amount of magnetic lines of force generated by the excitation coil C entering the Hall element (Hall element I and Hall element III) will decrease, while the amount of magnetic lines of force generated by the excitation coil A entering the Hall element (Hall element I and Hall element III) will not change (positive magnetic lines of force become the dominant magnetic lines of force), causing the magnetic lines of force entering the Hall element (Hall element I and Hall element III) to flip and become unbalanced, and as the damage gradually moves away from the Hall element, the sum of the magnetic lines of force drawn from the wire rope by Hall element I and Hall element III will gradually present a positive magnetic line state, that is, the sum of the electromotive forces converted by Hall element I and Hall element III will gradually increase; in this process, the sum of the electromotive forces of Hall element II and Hall element IV is not affected, so the sum of the two electromotive forces is differentially amplified to obtain the first half wave of the damage signal.

[0016] When the damage is from the excitation coil C to the Hall element II, the amount of magnetic lines of force generated by the excitation coil C entering the Hall element (Hall element II and Hall element IV) will decrease, while the amount of magnetic lines of force generated by the excitation coil B entering the Hall element (Hall element II and Hall element IV) will not change, causing the magnetic lines of force entering the Hall element (Hall element II and Hall element IV) to be unbalanced (positive magnetic lines of force become the dominant magnetic lines of force). As the damage gradually approaches the Hall element, the sum of the magnetic lines of force drawn from the wire rope by Hall element II and Hall element IV will gradually present a positive magnetic line state, that is, the sum of the electromotive force converted by Hall element II and Hall element IV will gradually increase. When the damage enters the Hall element II, it directly leads to a decrease in the overall ability of the Hall element (Hall element II and Hall element IV) to draw magnetic lines of force, forming a short transition zone. When the damage is from Hall element II to excitation coil B, the amount of magnetic force lines generated by excitation coil B entering the Hall element (Hall element II and Hall element IV) will decrease, while the amount of magnetic force lines generated by excitation coil C entering the Hall element (Hall element II and Hall element IV) will not change (negative magnetic force lines become the dominant magnetic force lines), so that the magnetic force lines entering the Hall element (Hall element II and Hall element IV) will flip and become unbalanced, and as the damage gradually moves away from the Hall element, the sum of magnetic force lines drawn from the wire rope by Hall element II and Hall element IV will gradually present a negative magnetic force line state, that is, the sum of the electromotive force converted by Hall element II and Hall element IV will gradually decrease. In this process, the sum of the electromotive force of Hall element I and Hall element III is not affected, so the second half wave of the damage signal can be obtained by differentially amplifying the sum of the two electromotive forces.

[0017] When the wire rope damage moves from the excitation coil B to the excitation coil A, the situation received by the sensor is exactly the opposite of the above situation.

[0018] In summary, the quantification of wire rope damage is achieved by combining the transmission speed of the wire rope and then comparing the damage signal size with the data in the database. In addition, the wire rope is tested using a positive and negative continuous magnetic field, so the residual magnetism of the wire rope after testing will be much smaller. The influence of leakage magnetic field during the measurement process will become much smaller.

[0019] The beneficial effects of the present invention are as follows: four Hall elements are used for detection at the same time, so that the measured damage signal is doubled, and at the same time, the influence of temperature on the measurement result can be offset, thereby improving the signal-to-noise ratio of the damaged signal inside and outside the wire rope; in addition, the present invention can evaluate the wear condition of the entire wire rope by measuring the diameter change of the wire rope as a whole through AC detection, intelligently set the basic parameters of the flaw detection software, and clear the magnetism of the wire rope before measurement; and the sensor performs magnetic extraction detection on the total magnetic flux inside the wire rope, which has nothing to do with its own jitter, so the sensor can effectively shield the influence of the wire rope's own jitter on the measurement result, and improve the accuracy of monitoring wire rope damage. At the same time, the sensor generates a continuous magnetic field of one positive and one negative, so that the residual magnetism of the wire rope after being measured will be very small, and will not affect the next measurement of the wire rope. The present invention is stable and reliable in operation, with a wide range of practical applications, making the measurement sensitivity and accuracy

[0020] The performance is greatly improved, and it is easier and more accurate to find the damage of the wire rope and quantify the damage of the wire rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the block diagram of the wire rope flaw detection sensor;

[0022] Figure 2 This is the internal schematic diagram of the magnetic field generation module of the double-circuit magnetic sensor for wire ropes;

[0023] Figure 3 This is a schematic diagram of the detection module of the double-circuit magnetic flaw detection sensor for wire ropes;

[0024] Figure 4 Schematic diagram of the internal principle of the double-circuit magnetic flaw detection sensor for wire ropes;

[0025] In the figure: 1. Excitation coil A; 2. E-type silicon steel sheet; 3. Excitation coil C; 4. Excitation coil B; 5. Wedge-shaped silicon steel sheet group; 6. Hall element; 7. Horseshoe-shaped silicon steel sheet group. DETAILED DESCRIPTION

[0026] The present invention is described below by way of examples.

[0027] like Figure 1As shown, the present invention provides a double-circuit magnetic flaw detection sensor for steel wire rope, which is composed of a sensor detection module, a sensor control module, and an intelligent processing module of a sensor host computer; wherein the sensor detection module is composed of a magnetic field generating module and a magnetic field detecting module; the sensor control module includes a DC signal detection preprocessing module, an AC signal adder module, a DC signal adder, a DC signal differential amplifier circuit, a single-chip analog-to-digital conversion module, and a power module; wherein the sensor control module implements two sets of processing circuits, when the excitation source is a DC power supply, the signal generated by the detection module is transmitted to the DC signal detection preprocessing module, and then enters the DC signal adder, the DC signal differential amplifier circuit, and the single-chip analog-to-digital conversion module; when the excitation source is an AC power supply, the signal generated by the detection module is transmitted to the AC signal adder module, and then enters the single-chip analog-to-digital conversion module, and finally transmitted to the intelligent processing module of the sensor host computer by the single-chip analog-to-digital conversion module.

[0028] like Figure 2 As shown, the magnetic field generating module uses an E-type silicon steel sheet 2 and its three groups of coils to form the upper part of the sensor excitation module. The three ends of the E-type silicon steel sheet 2 are semicircular grooves (determined according to the diameter of the wire rope), and the upper and lower E-type silicon steel sheets can be completely connected. The material, length, number of turns, and winding direction of the excitation coil A1 and the excitation coil B4 are the same. The silicon steel sheet in the middle is twice the width of the single-sided silicon steel sheet. The number of turns of the excitation coil C3 and the excitation coil B4 are equal, the excitation source is also the same, but the winding direction is opposite, so that two equal and opposite magnetic fields are formed in the measurement area of ​​the wire rope.

[0029] The sensor uses two detection modules for detection, and its structure is as follows Figure 3 As shown; each detection module uses two horseshoe-shaped silicon steel sheet groups 7 with high magnetic permeability, and a Hall element 6 is installed at each of the upper and lower ends, and then the whole circle is connected. When the measured wire rope passes through the whole circle, the Hall element 6 can extract the magnetic lines from the inside of the measured wire rope for measurement, and then the two Hall elements are connected to the E-type silicon steel sheet 2 groups by using the wedge-shaped silicon steel sheet group 5 and the wedge-shaped silicon steel sheet group 5 to form a magnetic circuit.

[0030] During the detection, the magnetic field detection module is combined with the magnetic field generation module, such as Figure 4 As shown, a detection module is placed at the center position between the excitation coil A1 and the excitation coil C3, and a detection module is also placed at the center position between the excitation coil B4 and the excitation coil C3. The test process is as follows.

[0031] 1. Communicate the overall testing plan

[0032] Apply AC power to the excitation coil A1 on the E-type silicon steel sheet 2, and apply AC power with a phase difference of 180° to the excitation coil B4. The excitation coil C3 is not connected to the excitation source, so that two equal alternating magnetic fields are formed in the wire rope measurement area. The measurement results obtained by Hall element I and Hall element III are summed (to offset the influence of the wire rope's own vibration on the sensor), and the measurement results obtained by Hall element II and Hall element IV are summed (to offset the influence of the wire rope's own vibration on the sensor). The two summed values ​​are averaged (to reduce the error), and the average value is compared with the reference data in the host computer to obtain the actual diameter data of the wire rope (by comparing the data in the database, the overall wear of the wire rope is judged, and the basic parameters of the flaw detection software are set). At the same time, the residual magnetism on the wire rope is cleared. Prepare for the next step of sensor precise flaw detection.

[0033] 2. DC Accurate Detection Solution

[0034] The same-direction DC power supply is applied to the three groups of excitation coils of the E-type silicon steel sheet. Since the winding direction of the excitation coils on both sides is opposite to that of the middle excitation coil, two constant magnetic fields of equal magnitude and opposite directions are formed in the measurement area of ​​the wire rope. It is assumed that the magnetic lines of force generated by the excitation coils A1 and B4 that enter the wire rope are positive magnetic lines of force, and the magnetic lines of force generated by the excitation coil C3 that enter the wire rope are negative magnetic lines of force. When the wire rope is not damaged, the Hall element is affected by the magnetic lines of force generated by the left and right coils, and the positive and negative magnetic lines of force cancel each other out, resulting in the output of the Hall element being the basic potential.

[0035] When the wire rope damage moves from the excitation coil A1 to the excitation coil B4: When the damage moves from the excitation coil A1 to the Hall element I, the amount of magnetic lines of force generated by the excitation coil A1 entering the Hall element (Hall element I and Hall element III) will decrease, while the amount of magnetic lines of force generated by the excitation coil C3 entering the Hall element (Hall element I and Hall element III) will not change, so that the magnetic lines of force entering the Hall element (Hall element I and Hall element III) will be unbalanced (negative magnetic lines of force become the dominant magnetic lines of force), and as the damage gradually approaches the Hall element, this causes the sum of the magnetic lines of force extracted from the wire rope by the Hall element I and the Hall element III to gradually present a negative magnetic line state, that is, the sum of the electromotive force converted by the Hall element I and the Hall element III will gradually decrease. When the damage enters the Hall element I, it directly leads to an overall reduction in the ability of the Hall element (Hall element I and Hall element III) to extract magnetic lines of force, forming a short transition zone. When the damage extends from Hall element I to the excitation coil C3, the amount of magnetic lines of force generated by the excitation coil C3 entering the Hall element (Hall element I and Hall element III) will decrease, while the amount of magnetic lines of force generated by the excitation coil A1 entering the Hall element (Hall element I and Hall element III) will not change (positive magnetic lines of force become the dominant magnetic lines of force), causing the magnetic lines of force entering the Hall element (Hall element I and Hall element III) to flip and become unbalanced, and gradually move away from the Hall element as the damage progresses. This causes the sum of the magnetic lines of force drawn from the wire rope by Hall element I and Hall element III to gradually become positive magnetic lines of force, that is, the sum of the electromotive forces converted by Hall element I and Hall element III will gradually increase. In this process, the sum of the electromotive force of Hall element II and Hall element IV is not affected, so the first half wave of the damage signal can be obtained by differentially amplifying the sum of the two electromotive forces; when the damage is from the excitation coil C3 to the Hall element II, the amount of magnetic force lines generated by the excitation coil C3 entering the Hall element (Hall element II and Hall element IV) will decrease, while the amount of magnetic force lines generated by the excitation coil B4 entering the Hall element (Hall element II and Hall element IV) will not change, so that the magnetic force lines entering the Hall element (Hall element II and Hall element IV) will be unbalanced (positive magnetic force lines become the dominant magnetic force lines), and as the damage gradually approaches the Hall element, this will cause the sum of the magnetic force lines extracted from the wire rope by Hall element II and Hall element IV to gradually present a positive magnetic force line state, that is, the sum of the electromotive force converted by Hall element II and Hall element IV will gradually increase. When the damage enters Hall element II, it directly leads to an overall reduction in the ability of the Hall element (Hall element II and Hall element IV) to extract magnetic force lines, forming a short transition zone.When the damage is from Hall element II to the excitation coil B, the amount of magnetic force lines generated by the excitation coil B4 entering the Hall element (Hall element II and Hall element IV) will decrease, while the amount of magnetic force lines generated by the excitation coil C3 entering the Hall element (Hall element II and Hall element IV) will not change (negative magnetic force lines become the dominant magnetic force lines), so that the magnetic force lines entering the Hall element (Hall element II and Hall element IV) will flip and become unbalanced, and as the damage gradually moves away from the Hall element, this will cause the sum of magnetic force lines drawn from the wire rope by Hall element II and Hall element IV to gradually present a negative magnetic force line state, that is, the sum of the electromotive force converted by Hall element II and Hall element IV will gradually decrease. In this process, the sum of the electromotive force of Hall element I and Hall element III is not affected, so the second half wave of the damage signal can be obtained by differentially amplifying the sum of the two electromotive forces.

[0036] When the wire rope damage moves from the excitation coil B4 to the excitation coil A1, the situation received by the sensor is exactly the opposite of the above situation.

[0037] In summary, the quantification of wire rope damage is achieved by combining the transmission speed of the wire rope and then comparing the damage signal size with the data in the database. In addition, the wire rope is tested using a positive and negative continuous magnetic field, so the residual magnetism of the wire rope after testing will be much smaller. The influence of leakage magnetic field during the measurement process will become much smaller.

Claims

1. A double-circuit magnetic flaw detection sensor for steel wire rope, which is composed of a sensor detection module, a sensor control module, and an intelligent processing module of a sensor host computer; characterized in that: The sensor detection module is composed of a magnetic field generation module and a magnetic field detection module; the sensor control module includes a DC signal detection preprocessing module, an AC signal adder module, a DC signal adder, a DC signal differential amplifier circuit, a single-chip analog-to-digital conversion module, and a power module; wherein the sensor control module implements two sets of processing circuits, when the excitation source is a DC power supply, the signal generated by the detection module is transmitted to the DC signal detection preprocessing module, and then enters the DC signal adder, the DC signal differential amplifier circuit, and the single-chip analog-to-digital conversion module; when the excitation source is an AC power supply, the signal generated by the detection module is transmitted to the AC signal adder module, and then enters the single-chip analog-to-digital conversion module, and finally transmitted to the intelligent processing module of the sensor host computer by the single-chip analog-to-digital conversion module; The magnetic field generating module comprises an excitation coil and an E-shaped silicon steel sheet bracket; wherein, the excitation part of the sensor is constituted by two groups of E-shaped silicon steel sheets and six groups of coils thereof, the three ends of the E-shaped silicon steel sheets are semicircular grooves, and the upper and lower two E-shaped silicon steel sheets can be completely butted together to form four stable magnetic fields of equal size and direction on the upper and lower sides, and equal size and opposite direction on the left and right sides; four horseshoe-shaped silicon steel sheet groups are used, and every two are butted together in a full circle, and a Hall element is installed on the top of each of them, and then four groups of wedge-shaped silicon steel sheet groups are used to connect the four Hall elements above and below the steel wire rope to the E-shaped silicon steel sheet groups respectively to form their own magnetic circuits, forming two groups of detection modules; In the excitation part, the coils wound with E-type silicon steel sheets in the upper part are, from left to right, excitation coil A, excitation coil C and excitation coil B; the coils wound with E-type silicon steel sheets in the lower part are, from left to right, excitation coil D, excitation coil E and excitation coil F.

2. A double-circuit magnetic flaw detection sensor for wire rope according to claim 1, characterized in that: The detection is carried out using an excitation coil. When the excitation source is an AC signal, an AC power supply needs to be applied to the excitation coil A on the E-type silicon steel sheet, and an AC power supply with a phase difference of 180° is applied to the excitation coil B. The excitation coil C is not connected to the excitation source, so that two equal alternating magnetic fields are formed in the wire rope measurement area; and the two Hall elements on the left or right generate stable AC signals, which are added to obtain the sum of their electromotive forces. By detecting the magnitude of their electromotive forces, the diameter of the measured wire rope can be compared by looking up the table, so as to evaluate the wear of the entire wire rope as a whole, set the basic parameters of the flaw detection software, and clear the residual magnetism on the wire rope; when the excitation source is a DC signal, if the wire rope vibrates itself, the sum of the electromotive forces generated by the two Hall elements on the left or right is unchanged, and when the wire rope is damaged, the sum of the electromotive forces generated by the two Hall elements on the left or right is variable, so the measurement results of the two groups of Hall elements on the left or right can be summed separately, and then the results of the two groups can be output through differential amplification.

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