Magnetic flux leakage detection device and detection method for transmission tower body

Abstract

The invention discloses a magnetic flux leakage detection device and method for a power transmission tower body, and aims to provide a magnetic flux leakage detection device and method for a power transmission tower body, which are convenient to carry and use and can quickly and effectively detect a power transmission tower so as to meet actual detection requirements. A magnetic flux leakage detection device for a power transmission tower body comprises a shell, and a detection opening is formed in the bottom face of the shell; the detection unit comprises an excitation structure and a magnetic field detection device which are arranged in the shell, the excitation structure comprises an armature and a permanent magnet, and the permanent magnet is located between the bottom face of the shell and the armature and used for magnetizing the transmission tower body; the magnetic field detection device right faces the detection opening, is located between the bottom face of the shell and the armature, and comprises a plurality of magnetic field detection probes.

Description

Technical Field

[0001] The invention relates to the field of power transmission line tower body detection, and in particular to a transmission tower body magnetic leakage detection device and a detection method. Background Art

[0002] At present, the transmission tower body is mainly based on hot-rolled angle steel, with Q235 and Q345 as the main steel types, and the surface is hot-dip galvanized for corrosion protection, with a general design life of 30 to 40 years. However, due to environmental erosion, the actual life of the transmission tower body is far from the required life, and accidents such as tower material rusting, rusting and even tower collapse occur from time to time, causing serious economic losses.

[0003] In order to ensure the safety of transmission tower structures, it is necessary to regularly inspect tower structures and angle steel profiles. At present, electrochemical methods, electromagnetic film thickness gauge methods, and ultrasonic methods are generally used for inspection. The workload is large, the inspection requirements are high, and the inspection efficiency is difficult to meet the needs of actual production. At the same time, the existing related inspection devices are often complex in structure and inconvenient to carry and use. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems that the current transmission tower structure detection device is inconvenient to carry and use, has a large workload, high detection requirements, and the detection efficiency is difficult to meet the actual detection needs. The present invention provides a transmission tower body leakage magnetic detection device and detection method that is easy to carry and use, can quickly and effectively detect transmission towers, and meet the actual detection needs.

[0005] The technical solution of the present invention is: A transmission tower body magnetic flux leakage detection device, comprising: A shell body, wherein a detection port is provided on the bottom surface of the shell body; A detection unit, the detection unit includes an excitation structure and a magnetic field detection device arranged in the shell, the excitation structure includes an armature and a permanent magnet, the permanent magnet is located between the bottom surface of the shell and the armature, and is used to magnetize the transmission tower body; The magnetic field detection device is directly opposite to the detection port and is located between the bottom surface of the shell and the armature. The magnetic field detection device includes a plurality of magnetic field detection probes.

[0006] The detection principle of the transmission tower body leakage magnetic detection device of this scheme is: the transmission tower body is magnetized by a permanent magnet of an excitation structure, so as to form a magnetic field loop between the transmission tower body and the armature. If there are defects on the surface of the transmission tower body, a leakage magnetic field will be formed near its surface. In this way, the magnetic field detection probe is used to detect the change of the magnetic field to identify the defects of the transmission tower body.

[0007] When the transmission tower body leakage magnetic field detection device of this scheme is actually used, the detection port is directed toward the transmission tower body, and the shell is moved along the transmission tower body, so that the defects of the transmission tower body can be identified. It is easy to carry and use, and can quickly and effectively detect the transmission tower to meet actual detection needs.

[0008] Preferably, a control unit is also included, which includes: A signal amplification module amplifies and filters the magnetic field signal detected by the magnetic field detection probe; A / D acquisition module, receiving the magnetic field signal from the signal amplification module and converting it into a digital signal; The single-chip microcomputer control module receives the digital signal from the A / D acquisition module and processes the digital signal provided by the A / D acquisition module; The communication module transmits the digital signal processed by the single-chip control module to the host computer by wireless transmission. In the host computer, the changes of leakage magnetic fields of different components are combined to realize the identification of angle steel defects, so as to realize automatic identification.

[0009] Preferably, the inner cavity of the shell is provided with a partition to divide the inner cavity of the shell into an upper cavity and a lower cavity, the control unit is distributed in the upper cavity, and the detection unit is distributed in the lower cavity.

[0010] Preferably, the armature is an armature block, and the armature block is parallel to the bottom surface of the shell. In this way, after the permanent magnet magnetizes the transmission tower body, it is conducive to forming a magnetic field loop between the transmission tower body and the armature.

[0011] Preferably, there are two permanent magnets, and the magnetic field detection device is located between the two permanent magnets, which is conducive to the permanent magnets magnetizing the transmission tower body and improving the compactness of the structure.

[0012] As a preference, a detection lifting and adjusting mechanism is also included, which includes: A guide rod is fixed in the shell and is perpendicular to the bottom surface of the shell. The magnetic field detection device includes a bracket, which moves along the guide rod, and the magnetic field detection probe is arranged on the bracket; The lifting actuator drives the bracket to move along the guide rod. In this way, the height position of the bracket and the magnetic field detection probe can be adjusted by the lifting actuator to adapt to different detection environment needs and achieve the best detection effect.

[0013] Preferably, the lifting actuator includes a detection adjustment screw, the detection adjustment screw is parallel to the guide rod, the detection adjustment screw is rotatably arranged on the housing, and the detection adjustment screw is connected to the bracket by a thread. In this way, the height position of the bracket and the magnetic field detection probe can be adjusted by rotating the detection adjustment screw, which is easy to operate.

[0014] Preferably, it also includes an excitation lifting adjustment mechanism, the permanent magnet is fixed on the armature, the armature can move up and down in the inner cavity of the shell, and the excitation lifting adjustment mechanism includes an excitation adjustment screw, the excitation adjustment screw is perpendicular to the bottom surface of the shell, the excitation adjustment screw is rotatably set on the shell, and the excitation adjustment screw is connected to the armature through a thread. In this way, the height position of the excitation structure can be adjusted by the excitation adjustment screw to adapt to different detection environment needs and achieve the best detection effect.

[0015] Preferably, the magnetic field detection probe includes a vertical magnetic field probe perpendicular to the bottom surface of the shell and a horizontal magnetic field probe parallel to the bottom surface of the shell. In this way, leakage magnetic field signals of different components can be collected by the horizontal magnetic field probe and the vertical magnetic field probe respectively to improve detection accuracy.

[0016] Preferably, a roller is provided at the bottom of the shell, and the shell is a metal shell. In this way, the shell can be moved along the transmission tower body by the roller, so that the transmission tower can be quickly and effectively detected to meet actual detection needs.

[0017] A method for detecting a transmission tower body using a transmission tower body magnetic flux leakage detection device comprises the following steps: The detection port is directed toward the transmission tower body, and the shell is moved along the steel structure surface of the transmission tower body; in this process, the permanent magnet of the excitation structure magnetizes the steel structure of the transmission tower body, thereby forming a magnetic field loop between the steel structure of the transmission tower body and the armature; if there are defects on the steel structure surface of the transmission tower body, a leakage magnetic field will be formed at the defects on the steel structure surface, thereby identifying the defects of the transmission tower body through the magnetic field changes detected by the magnetic field detection probe.

[0018] The beneficial effect of the present invention is that when it is actually used, the detection port is directed toward the transmission tower body, and the shell is moved along the transmission tower body. During this process, the permanent magnet of the excitation structure magnetizes the transmission tower body, thereby forming a magnetic field loop between the transmission tower body and the armature. If there are defects on the surface of the transmission tower body, a leakage magnetic field will be formed on its near surface, so that the magnetic field change is detected by the magnetic field detection probe to identify the defects of the transmission tower body, so as to realize the identification of the defects of the transmission tower body. It is easy to carry and use, and can quickly and effectively detect the transmission tower to meet the actual detection needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The invention discloses a schematic cross-sectional structure diagram of a magnetic flux leakage detection device for a power transmission tower body.

[0020] Figure 2It is a three-dimensional structural schematic diagram of a transmission tower body magnetic flux leakage detection device of the present invention.

[0021] Figure 3 The present invention is a working principle diagram of a transmission tower body magnetic flux leakage detection device.

[0022] In the figure: Shell 1, interlayer 1.1, roller 1.2, detection port 1.3; Excitation structure 2, armature 2.1, permanent magnet 2.2; Magnetic field detection device 3, magnetic field detection probe 3.1, bracket 3.2; Detecting the lifting and lowering adjustment mechanism 4, detecting the adjusting screw 4.1, and the guide rod 4.2; Excitation adjustment screw 5; Control unit 6. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Specific embodiment 1, as Figure 1 , Figure 2 , Figure 3 As shown, a transmission tower body magnetic flux leakage detection device comprises a housing 1, a detection unit and a control unit 6. A detection port 1.3 is provided on the bottom surface of the housing. A roller 1.2 is provided on the bottom of the housing.

[0024] The detection unit includes an excitation structure 2 and a magnetic field detection device 3 arranged in the shell. The excitation structure includes an armature 2.1 and a permanent magnet 2.2. The permanent magnet is located between the bottom surface of the shell and the armature, and is used to magnetize the transmission tower body. The magnetic field detection device 3 is directly opposite to the detection port, and the magnetic field detection device is located between the bottom surface of the shell and the armature. The magnetic field detection device includes a plurality of magnetic field detection probes 3.1.

[0025] The control unit includes a signal amplification module, an A / D acquisition module, a single-chip control module, a communication module and a power module. The power module provides power to the control unit. The signal amplification module amplifies and filters the magnetic field signal detected by the magnetic field detection probe. The A / D acquisition module receives the magnetic field signal from the signal amplification module and converts it into a digital signal. The single-chip control module receives the digital signal from the A / D acquisition module and processes the digital signal provided by the A / D acquisition module. The communication module transmits the digital signal processed by the single-chip control module to the host computer by wireless transmission. In the host computer, the defects of the angle steel are identified by combining the changes in the leakage magnetic field of different components to achieve automatic identification.

[0026] The detection principle of the transmission tower body leakage magnetic field detection device of this embodiment is: the transmission tower body is magnetized by a permanent magnet of an excitation structure, so as to form a magnetic field loop between the transmission tower body and the armature. If there are defects on the surface of the transmission tower body, a leakage magnetic field will be formed near its surface. In this way, the magnetic field detection probe is used to detect the change of the magnetic field to identify the defects of the transmission tower body.

[0027] The specific use of the transmission tower body leakage magnetic field detection device of this embodiment is as follows: The detection port is directed toward the transmission tower body, and the transmission tower body leakage magnetic detection device is moved along the steel structure surface (such as the angle steel surface) of the transmission tower body by the roller. In this process, the permanent magnet of the excitation structure magnetizes the transmission tower body, thereby forming a magnetic field loop between the transmission tower body and the armature. If there are defects on the surface of the transmission tower body, a leakage magnetic field will be formed on its near surface, so that magnetic field signals of different components are collected respectively by the magnetic field detection probe; after amplification and filtering by the signal amplification module and conversion into digital signals by the A / D acquisition module; then, the digital signal provided by the A / D acquisition module is processed by the single-chip control module, and the digital signal processed by the single-chip control module is transmitted to the host computer by wireless transmission through the communication module. In the host computer, the angle steel defects are identified in combination with the changes in the leakage magnetic fields of different components to achieve automatic identification. The transmission tower body leakage magnetic detection device of this embodiment is easy to carry and use, and can quickly and effectively detect the transmission tower to meet the actual detection needs.

[0028] In this embodiment, the A / D acquisition module uses the HX711 chip, the single-chip control module uses the STM32F103 series chip, and the communication module uses the ESP8266 chip.

[0029] The inner cavity of the shell is provided with a partition 1.1, which divides the inner cavity of the shell into an upper cavity and a lower cavity. The control unit is distributed in the upper cavity, and the detection unit is distributed in the lower cavity.

[0030] Furthermore, the magnetic field detection probe 3.1 includes a vertical magnetic field probe perpendicular to the bottom surface of the shell and a horizontal magnetic field probe parallel to the bottom surface of the shell. In this way, leakage magnetic field signals of different components can be collected by the horizontal magnetic field probe and the vertical magnetic field probe respectively to improve the detection accuracy.

[0031] In this embodiment, there are multiple vertical magnetic field probes, and the multiple vertical magnetic field probes are arranged in a row. There are multiple horizontal magnetic field probes, and the multiple horizontal magnetic field probes are arranged in a row.

[0032] Furthermore, the armature is an armature block, and the armature block is parallel to the bottom surface of the shell (specifically, the upper and lower surfaces of the armature block are parallel to the bottom surface of the shell). In this way, after the permanent magnet magnetizes the transmission tower body, it is conducive to forming a magnetic field loop between the transmission tower body and the armature.

[0033] There are two permanent magnets, and the magnetic field detection device is located between the two permanent magnets. This is conducive to the permanent magnets magnetizing the transmission tower body and improving the compactness of the structure.

[0034] Specific embodiment 2: The rest of the structure of this embodiment refers to the specific embodiment 1, except that: In one implementation of this embodiment, the magnetic field detection device is fixed in the housing.

[0035] In another implementation of this embodiment, Figure 1 As shown, a transmission tower body leakage magnetic field detection device also includes a detection lifting and adjusting mechanism 4. The detection lifting and adjusting mechanism includes a guide rod 4.2 and a lifting actuator. The guide rod is fixed in the shell, and the guide rod is perpendicular to the bottom surface of the shell. The magnetic field detection device includes a bracket 3.2. The bracket moves along the guide rod. The magnetic field detection probe is set on the bracket. The lifting actuator drives the bracket to move along the guide rod. In this way, the height position of the bracket and the magnetic field detection probe can be adjusted by the lifting actuator to adapt to different detection environment needs and achieve the best detection effect.

[0036] Specifically, the lifting actuator includes a detection adjustment screw 4.1. The detection adjustment screw is parallel to the guide rod. The detection adjustment screw is rotatably arranged on the housing. The detection adjustment screw is connected to the bracket by a thread. The upper end of the detection adjustment screw is located outside the housing, and a knob is provided on the top of the detection adjustment screw. The detection adjustment screw passes through the bracket. In this way, the height position of the bracket and the magnetic field detection probe can be adjusted by rotating the detection adjustment screw, which is easy to operate.

[0037] Specific embodiment 3: The rest of the structure of this embodiment refers to specific embodiment 1 or specific embodiment 2, and the difference is that: In one implementation of this embodiment, the excitation lifting and lowering adjustment mechanism is fixed in the housing.

[0038] In another implementation of this embodiment, Figure 1As shown, a transmission tower body leakage magnetic detection device also includes an excitation lifting and adjusting mechanism. The permanent magnet is fixed on the armature. The armature can move up and down in the inner cavity of the shell. The inner cavity of the shell serves as a guide channel for the armature. The excitation lifting and adjusting mechanism includes an excitation adjusting screw 5. The excitation adjusting screw is perpendicular to the bottom surface of the shell and is rotatably arranged on the shell. The excitation adjusting screw is connected to the armature by a thread, and the excitation adjusting screw passes through the armature. In this way, the height position of the excitation structure can be adjusted by the excitation adjusting screw to adapt to different detection environment needs and achieve the best detection effect.

[0039] Specific embodiment 4 is a method for detecting a power transmission tower body using a power transmission tower body leakage magnetic flux detection device. The specific structure of the power transmission tower body leakage magnetic flux detection device in this method refers to specific embodiment 1, specific embodiment 2 or specific embodiment 3.

[0040] A method for detecting a transmission tower body using a transmission tower body magnetic flux leakage detection device comprises the following steps: The detection port is directed toward the transmission tower body, and the shell is moved along the surface of the steel structure (such as the angle steel surface) of the transmission tower body through the roller. In this process, the permanent magnet of the excitation structure magnetizes the steel structure of the transmission tower body, thereby forming a magnetic field loop between the steel structure of the transmission tower body and the armature. If there are defects on the surface of the steel structure of the transmission tower body, a leakage magnetic field will be formed at the defect on the surface of the steel structure, so that the defects of the transmission tower body can be identified through the magnetic field changes detected by the magnetic field detection probe. The magnetic field signal collected by the magnetic field detection probe is amplified and filtered by the signal amplification module and converted into a digital signal by the A / D acquisition module; then, the single-chip control module processes the digital signal provided by the A / D acquisition module, and transmits the digital signal processed by the single-chip control module to the host computer by wireless transmission through the communication module. In the host computer, the angle steel defects are identified in combination with the changes in the leakage magnetic fields of different components to achieve automatic identification.

[0041] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A transmission tower body magnetic flux leakage detection device, characterized in that: include: A shell body, wherein a detection port is provided on the bottom surface of the shell body; A detection unit, the detection unit includes an excitation structure and a magnetic field detection device arranged in the shell, the excitation structure includes an armature and a permanent magnet, the permanent magnet is located between the bottom surface of the shell and the armature, and is used to magnetize the transmission tower body; The magnetic field detection device is directly opposite to the detection port and is located between the bottom surface of the shell and the armature. The magnetic field detection device includes a plurality of magnetic field detection probes.

2. A transmission tower body magnetic flux leakage detection device according to claim 1, characterized in that: Also included is a control unit comprising: A signal amplification module is used to amplify and filter the magnetic field signal detected by the magnetic field detection probe; A / D acquisition module, receiving the magnetic field signal from the signal amplification module and converting it into a digital signal; The single-chip microcomputer control module receives the digital signal from the A / D acquisition module and processes the digital signal provided by the A / D acquisition module; The communication module transmits the digital signal processed by the single-chip control module to the host computer in a wireless transmission mode.

3. A transmission tower body magnetic flux leakage detection device according to claim 2, characterized in that: The inner cavity of the shell is provided with a partition, which divides the inner cavity of the shell into an upper cavity and a lower cavity. The control unit is distributed in the upper cavity, and the detection unit is distributed in the lower cavity.

4. A transmission tower body magnetic flux leakage detection device according to claim 1, 2 or 3, characterized in that: The armature is an armature block, and the armature block is parallel to the bottom surface of the shell.

5. A transmission tower body magnetic flux leakage detection device according to claim 1, 2 or 3, characterized in that: There are two permanent magnets, and the magnetic field detection device is located between the two permanent magnets.

6. A transmission tower body magnetic flux leakage detection device according to claim 1, 2 or 3, characterized in that: It also includes a detection lifting and adjusting mechanism, which includes: A guide rod is fixed in the shell and is perpendicular to the bottom surface of the shell. The magnetic field detection device includes a bracket, which moves along the guide rod, and the magnetic field detection probe is arranged on the bracket; The lifting actuator drives the bracket to move along the guide rod. The lifting actuator includes a detection adjustment screw, which is parallel to the guide rod, is rotatably arranged on the shell, and is connected to the bracket through threads.

7. A transmission tower body magnetic flux leakage detection device according to claim 1, 2 or 3, characterized in that: It also includes an excitation lifting and adjusting mechanism, wherein the permanent magnet is fixed on the armature, and the armature can move up and down in the inner cavity of the shell. The excitation lifting and adjusting mechanism includes an excitation adjusting screw, which is perpendicular to the bottom surface of the shell, and the excitation adjusting screw is rotatably set on the shell, and the excitation adjusting screw is connected to the armature by a thread.

8. A transmission tower body magnetic flux leakage detection device according to claim 1, 2 or 3, characterized in that: The magnetic field detection probe comprises a vertical magnetic field probe which is vertically distributed to the bottom surface of the shell and a horizontal magnetic field probe which is parallelly distributed to the bottom surface of the shell.

9. A transmission tower body magnetic flux leakage detection device according to claim 1, 2 or 3, characterized in that: A roller is arranged at the bottom of the shell, and the shell is a metal shell.

10. A method for detecting a transmission tower body using a transmission tower body magnetic flux leakage detection device according to any one of claims 1 to 9, characterized in that: The following steps are included: The detection port is directed toward the transmission tower body, and the shell is moved along the steel structure surface of the transmission tower body; in this process, the permanent magnet of the excitation structure magnetizes the steel structure of the transmission tower body, thereby forming a magnetic field loop between the steel structure of the transmission tower body and the armature; if there are defects on the steel structure surface of the transmission tower body, a leakage magnetic field will be formed at the defects on the steel structure surface, thereby identifying the defects of the transmission tower body through the magnetic field changes detected by the magnetic field detection probe.

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