Steel wire rope nondestructive testing device and method for removing magnetic field interference

Abstract

The invention relates to the technical field of steel wire rope nondestructive testing, in particular to a steel wire rope nondestructive testing device and method capable of removing magnetic field interference. And synchronously measuring the magnetic induction intensity of the external magnetic field at the position of the steel wire rope, and removing the magnetic induction intensity of the external magnetic field to obtain the actual magnetic induction intensity of the steel wire rope. The geomagnetic influence can be eliminated in the steel wire rope electromagnetic flaw detection, and the steel wire rope detection precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of non-destructive testing of steel wire ropes, and specifically to a non-destructive testing device and method for steel wire ropes that remove magnetic field interference. Background Art

[0002] The electromagnetic detection devices for steel wire ropes on the market now are often designed on the premise that the detection direction remains unchanged during detection. When the detection direction remains unchanged, the geomagnetic field is a stable magnetic field relative to the detection device and usually does not affect the magnetic flaw detection of steel wire ropes. However, in some special detection scenarios, such as when detecting steel wire rope damage on a ship traveling at sea, the ship may turn during the detection process, resulting in the situation where the geomagnetic field is no longer a stable magnetic field relative to the detection device. In this case, the detection device will capture the change in the geomagnetism, which may lead to misjudging that it is the damage of the steel wire rope, or due to the change in the geomagnetism, the damage of the steel wire rope cannot be detected, resulting in false judgment. Summary of the Invention

[0003] The present invention aims to provide a non-destructive testing device and method for steel wire ropes that remove magnetic field interference, which can eliminate the influence of the geomagnetism in the electromagnetic flaw detection of steel wire ropes and improve the accuracy of steel wire rope detection.

[0004] To solve the above technical problems, the specific solution adopted by the present invention is as follows: A non-destructive testing method for steel wire ropes that remove magnetic field interference, which determines whether the steel wire rope is damaged by detecting the magnetic induction intensity of the magnetized steel wire rope through an electromagnetic sensor, synchronously measures the magnetic induction intensity of the external magnetic field at the position where the steel wire rope is located, and obtains the actual magnetic induction intensity of the steel wire rope after removing the magnetic induction intensity of the external magnetic field.

[0005] Preferably, the external magnetic field is the geomagnetic field, and the magnetic induction intensity of the geomagnetic field at the position where the steel wire rope is located is detected through a geomagnetic sensor.

[0006] Preferably, the actual magnetic induction intensity of the steel wire rope = the detection data of the electromagnetic sensor - the detection data of the geomagnetic sensor * influence coefficient.

[0007] Preferably, the method for determining the influence coefficient is as follows: First, place the electromagnetic sensor and the geomagnetic sensor facing due north, record the output data of the electromagnetic sensor and the geomagnetic sensor, then place the electromagnetic sensor and the geomagnetic sensor facing due south, record the output data of the electromagnetic sensor and the geomagnetic sensor, and divide the difference in the north-south direction of the electromagnetic sensor by the difference in the north-south direction of the geomagnetic sensor to obtain the influence coefficient.

[0008] A non-destructive testing device for steel wire ropes to remove magnetic field interference, including a detector body for detecting the magnetic induction intensity of the steel wire rope after excitation. There is an electromagnetic sensor in the detector body, and a geomagnetic sensor for detecting the magnetic induction intensity of the geomagnetism at the position where the steel wire rope is located is also provided on the detector body.

[0009] Preferably, the distance between the geomagnetic sensor and the electromagnetic sensor is greater than 11 cm.

[0010] Preferably, the detector body has a housing with an open through groove for the steel wire rope to pass through. The electromagnetic sensor is arranged on the outer periphery of the housing at the position of the through groove.

[0011] Preferably, a handle for personnel to hold is provided at the top of the housing, and the geomagnetic sensor is arranged in the cavity of the handle.

[0012] Preferably, guide wheel assemblies for clamping and fixing the steel wire rope and adjusting the steel wire rope to be centered are respectively arranged at both ends of the through groove; the guide wheel assembly includes a fixed roller and two moving rollers distributed in a triangular shape. A clamping cavity for clamping the steel wire rope is formed between the fixed roller and the moving rollers, and there is a gap for the steel wire rope to enter the clamping cavity between the two moving rollers; the fixed roller is rotatably arranged on a fixed wheel frame, the fixed wheel frame is fixed on the housing, the moving roller is rotatably arranged on a moving wheel frame, the moving wheel frame is slidably arranged on the housing, and a spring for pushing the two moving rollers to approach each other is provided on the housing.

[0013] Preferably, the rim of the fixed roller is linear, and the rim of the moving roller is arc-shaped.

[0014] In the non-destructive testing process of the steel wire rope, the present invention synchronously detects the magnetic field of the steel wire rope and environmental magnetic fields such as geomagnetism, and then eliminates the interference of environmental magnetic fields such as geomagnetism on the detection magnetic field of the steel wire rope, so as to make the detection of slightly damaged steel wire ropes more accurate and effectively identify single wire breakage damage in the steel wire rope. At the same time, it can also meet the precise detection under special environments. For example, when detecting the steel wire rope on a sailing ship, it can avoid the geomagnetic interference caused by the change of geomagnetism due to the turning of the hull, thus facilitating the guarantee of the quality of the steel wire rope. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of a non-destructive testing device for steel wire ropes to remove magnetic field interference of the present invention.

[0016] Figure 2 It is a front view structural diagram of a non-destructive testing device for steel wire ropes to remove magnetic field interference of the present invention.

[0017] Figure 3 It is a sectional view structural diagram of the handle part of a non-destructive testing device for steel wire ropes to remove magnetic field interference of the present invention.

[0018] Figure 4 Schematic structural diagram of a guide wheel assembly in a non-destructive testing device for steel wire ropes that eliminates magnetic field interference according to the present invention.

[0019] Figure 5 Left view structural schematic diagram of the detector body part in a non-destructive testing device for steel wire ropes that eliminates magnetic field interference according to the present invention.

[0020] Figure 6 is Figure 5 Schematic cross-sectional view taken along line A-A in

[0021] Figure 7 is Figure 6 Schematic cross-sectional view taken along line B-B in

[0022] Markings in the figure: 1. Guide wheel assembly, 101. Fixed wheel frame, 102. Fixed roller, 103. Clamping cavity, 104. Movable roller, 105. Movable wheel frame, 106. Slide block, 107. Guide rail, 108. Spring seat plate, 109. Spring, 2. Encoder assembly, 3. Detector body, 301. Housing, 302. Bus board, 303. Encoding wheel plug plate, 304. Upper cover, 305. Battery, 306. Main board, 307. Electromagnetic sensor, 308. Through groove, 4. Handle, 5. Geomagnetic mounting plate, 6. Geomagnetic sensor. Specific embodiments

[0023] As Figure 1 , 2 shown, a non-destructive testing device for steel wire ropes that eliminates magnetic field interference according to the present invention has a detector body 3 containing an electromagnetic sensor 307 as conventional in the art as the main body. During the detection process, the steel wire rope to be detected is first magnetized to make the magnetic field of the steel wire rope orderly, and then it is judged whether it is damaged by the magnetic induction intensity detected by the electromagnetic sensor 307 in the detector body 3. Specifically, the magnetic induction intensity about 1 cm around the outer circumference of the steel wire rope is usually detected, and whether the steel wire rope is damaged and the damage condition are judged by the change amount of the magnetic induction intensity. Different from the conventional detection means in the art, the present invention also has a geomagnetic sensor 6 for detecting the magnetic induction intensity of the geomagnetic field, which can eliminate the influence of the geomagnetic field in the electromagnetic flaw detection of the steel wire rope and improve the detection accuracy of the steel wire rope.

[0024] Combined with Figure 1 , 2, as shown in the external and internal pictures of the detector body 3 shown in FIGS. 5, 6, and 7, similar to the conventional wire rope non-destructive testing device, the detector body 3 of the present invention has a housing 301, and components such as an electromagnetic sensor 307, an upper cover 304, an indicator light, a coding wheel plug plate 303, a main board 306, a battery 305, and a bus board 302 are provided in the housing 301. The electromagnetic sensor 307 is installed on the bus board 302; the bus board 302 with the electromagnetic sensor 307 is inserted into the slot of the housing 301; the battery 305 is inserted into the slot of the housing 301; the main board 306 is installed on the upper cover 304; the indicator light is installed on the upper cover 304; the upper cover 304 is installed on the housing 301; the coding wheel plug plate 303 is inserted into the slot of the housing 301. An encoder assembly 2 cooperating with the coding wheel plug plate 303 is provided on the left side of the housing 301. A handle 4 for personnel to hold is provided on the top of the housing 301.

[0025] Different from the conventional wire rope non-destructive testing device, as Figure 3 shown, the handle 4 has a cavity, and a geomagnetic mounting plate 5 is fixedly provided in the cavity by bolts, and the above-mentioned geomagnetic sensor 6 is fixed on the geomagnetic mounting plate 5. Since the magnetic field range of the wire rope after magnetization usually does not exceed 11 cm, in the present invention, the geomagnetic sensor 6 is set at a distance of 15 cm from the wire rope to eliminate the influence of the wire rope magnetic field on the geomagnetic detection.

[0026] During the detection process, the magnetic induction intensity of the magnetic field measured by the geomagnetic sensor 6 can be regarded as the magnetic field data of the geomagnetic field (or ambient magnetic field) at the position of the wire rope to be measured. Then, the influence coefficient of the geomagnetic field on the electromagnetic sensor 307 is measured, and the product of the two is the amount that needs to be corrected. Subtracting this correction amount from the original magnetic induction intensity measured by the electromagnetic sensor 307 can be regarded as the magnetic induction intensity of the damaged wire rope after eliminating the ambient magnetic field.

[0027] The measurement method of the above influence coefficient is as follows: First, place the detector body 3 with the electromagnetic sensor 307 and the geomagnetic sensor 6 facing due north, record the output data of the electromagnetic sensor 307 and the geomagnetic sensor 6, then place the detector body 3 with the electromagnetic sensor 307 and the geomagnetic sensor 6 facing due south, record the output data of the electromagnetic sensor 307 and the geomagnetic sensor 6, and divide the difference in the north-south direction of the electromagnetic sensor 307 by the difference in the north-south direction of the geomagnetic sensor 6 to obtain the influence coefficient.

[0028] In addition, for facilitating the buckling of the present invention on the wire rope for detection, an open through groove 308 for the wire rope to penetrate is provided at the bottom of the housing 301 of the detector body 3, and a guide wheel assembly 1 for clamping the wire rope and making it centered in the through groove 308 is respectively provided at both ends of the through groove 308 on the housing 301.

[0029] As Figure 4As shown, the guide wheel assembly 1 includes a fixed roller 102 located at the top of the through groove 308 and two moving rollers 104 located on both sides of the through groove 308. The rim of the fixed roller 102 is linear and is rotatably arranged on the fixed wheel frame 101 through a pin shaft, and the fixed wheel frame 101 is fixed on the housing 301 by screws. The rim of the moving roller 104 is arc-shaped and is rotatably arranged on the moving wheel frame 105 through a pin shaft. A slider 106 is provided on the moving wheel frame 105, and the slider 106 is slidably matched with the guide rail 107 fixed on the housing 301. A spring seat plate 108 is also fixedly provided at a position on the housing 301 opposite to the moving wheel frame 105, and a spring 109 is provided between the spring seat plate 108 and the moving wheel frame 105 to maintain the two moving rollers 104 in the initial state as shown in Figure 4 the figure. In this initial state, a clamping cavity 103 for clamping the steel wire rope is formed between the fixed roller 102 and the two moving rollers 104. The present invention is buckled onto the steel wire rope from top to bottom, so that the steel wire rope enters the clamping cavity after passing over the protruding parts of the two moving rollers 104. At this time, both springs 109 are in a compressed state and push the two moving rollers 104 to cooperate with the fixed roller 102 to position the steel wire rope.

Claims

1. A non-destructive testing method for a steel wire rope for removing magnetic field interference, wherein the electromagnetic sensor (307) detects the magnetic induction intensity of the steel wire rope after excitation to determine whether the steel wire rope is damaged, characterized in that: The magnetic induction intensity of the external magnetic field at the location of the wire rope is measured synchronously, and the actual magnetic induction intensity of the wire rope is obtained after the magnetic induction intensity of the external magnetic field is removed.

2. A non-destructive testing method for steel wire ropes for removing magnetic field interference as claimed in claim 1, characterized in that: The external magnetic field is the geomagnetism, and the magnetic induction intensity of the geomagnetism at the location of the steel wire rope is detected by a geomagnetic sensor (6).

3. A non-destructive testing method for steel wire ropes for removing magnetic field interference as claimed in claim 2, characterized in that: The actual magnetic induction intensity of the steel wire rope = the detection data of the electromagnetic sensor (307) - the detection data of the geomagnetic sensor (6) * the influence coefficient.

4. A non-destructive testing method for steel wire ropes for removing magnetic field interference as claimed in claim 3, characterized in that: The method for determining the influence coefficient is as follows: firstly, the electromagnetic sensor (307) and the geomagnetic sensor (6) are placed facing due north, and the output data of the electromagnetic sensor (307) and the geomagnetic sensor (6) are recorded; then, the electromagnetic sensor (307) and the geomagnetic sensor (6) are placed facing due south, and the output data of the electromagnetic sensor (307) and the geomagnetic sensor (6) are recorded; and the difference between the north and south directions of the electromagnetic sensor (307) and the geomagnetic sensor (6) are divided by the difference between the north and south directions of the geomagnetic sensor (6), so as to obtain the influence coefficient.

5. A non-destructive testing device for steel wire ropes for removing magnetic field interference, comprising a detector body (3) for detecting the magnetic induction intensity of the steel wire rope after excitation, wherein the detector body (3) has an electromagnetic sensor (307), characterized in that: A geomagnetic sensor (6) for detecting the magnetic induction intensity of the geomagnetic field at the location where the steel wire rope is located is also provided on the detector body (3).

6. A nondestructive testing device for steel wire ropes for removing magnetic field interference as claimed in claim 5, characterized in that: The distance between the geomagnetic sensor (6) and the electromagnetic sensor (307) is greater than 11 cm.

7. A nondestructive testing device for steel wire ropes for removing magnetic field interference as claimed in claim 5, characterized in that: The detector body (3) has a shell (301), the shell (301) has an open through slot (308) for a steel wire rope to pass through, and the electromagnetic sensor (307) is arranged on the outer periphery of the shell (301) at the through slot (308).

8. A non-destructive testing device for steel wire ropes for removing magnetic field interference as claimed in claim 7, characterized in that: A handle (4) for a person to hold is provided on the top of the housing (301), and the geomagnetic sensor (6) is arranged in a cavity of the handle (4).

9. A nondestructive testing device for steel wire ropes for removing magnetic field interference as claimed in claim 7, characterized in that: Guide wheel assemblies (1) for clamping and fixing a steel wire rope and adjusting the steel wire rope to be centered are respectively provided at both ends of the through groove (308); the guide wheel assembly (1) comprises a fixed roller (102) and two movable rollers (104) arranged in a herringbone shape; a clamping cavity (103) for clamping the steel wire rope is formed between the fixed roller (102) and the movable roller (104); a gap is provided between the two movable rollers (104) for allowing the steel wire rope to enter the clamping cavity (103); the fixed roller (102) is rotatably arranged on a fixed roller frame (101), the fixed roller frame (101) is fixed on a housing (301), the movable roller (104) is rotatably arranged on a movable roller frame (105), the movable roller frame (105) is slidably arranged on the housing (301), and a spring for pushing the two movable rollers (104) toward each other is provided on the housing (301).

10. A non-destructive testing device for steel wire ropes for removing magnetic field interference as claimed in claim 9, characterized in that: The rim of the fixed roller (102) is linear, and the rim of the movable roller (104) is arc-shaped.

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