A handheld traction steel belt leakage magnetic field detection device

Abstract

A handheld traction steel belt magnetic leakage detection device, belonging to the field of elevator steel belt detection, includes an outer frame, an inner frame, a magnetization module, a magnetic field detection module, and a roller positioning module. The inner frame is installed inside the middle of the outer frame and is divided into an upper inner frame and a lower inner frame. The U-shaped arc surface formed by the upper and lower inner frames fits into the inner U-shaped arc surface of the magnetization module. The magnetic field detection module is installed inside the upper and lower inner frames. The middle part between the upper and lower inner frames is a detection channel for the traction steel belt to be tested to pass through. The detection end of the magnetic field detection module is aligned with the detection channel. A roller frame is installed on each side of the outer frame. Roller positioning modules are installed on the upper and lower sides of the roller frames, respectively. The positioning station between the rollers of the two roller positioning modules is for the traction steel belt to be tested to pass through and be positioned. This invention achieves sensitive and reliable detection, while also possessing good portability and field applicability.

Description

Technical Field

[0001] This invention belongs to the field of elevator steel belt inspection, specifically relating to a traction steel belt defect detection device based on the principle of magnetic flux leakage detection. Background Technology

[0002] During long-term use, elevator traction steel belts may develop defects such as broken wires and pitting due to fatigue, wear, and corrosion. These defects are hidden inside the polyurethane coating and cannot be directly observed with the naked eye.

[0003] Currently, the main methods for inspecting elevator traction steel belts rely on periodic manual visual inspection, resistance testing, and eddy current testing. Manual visual inspection is limited to surface appearance and struggles to detect internal damage. The resistance testing method is flawed because it cannot pinpoint the exact location and severity of defects within the steel belt, leading to a shutdown alarm without knowing the size of the defect. While large-scale online monitoring systems exist, their high cost makes them unsuitable for on-site maintenance. Eddy current testing has weak depth detection capabilities and is easily affected by external vibrations and the material itself.

[0004] The traction steel belt is flat and the internal steel wires are insulated from each other. The commonly used U-shaped magnetic yoke is difficult to magnetize the steel wires uniformly and saturatedly across the entire width, resulting in the failure to detect small wire breaks and internal defects.

[0005] Traction steel belts are composed of multiple parallel steel wires. General equipment cannot accurately locate which steel wire a defect occurs in, which makes subsequent safety assessments and maintenance decisions difficult.

[0006] Therefore, there is an urgent need for a portable inspection tool specifically designed for elevator traction steel belts, capable of penetrating the surface coating and accurately locating internal steel wire defects. Summary of the Invention

[0007] To overcome the shortcomings of existing technologies, this invention provides a handheld magnetic flux leakage detection device for traction steel belts. This device aims to effectively penetrate the polyurethane coating on the surface of the steel belt to achieve sensitive and reliable detection of defects such as broken wires and pitting corrosion inside the steel belt. It can also accurately locate the steel wire strands where the defects are located and their axial positions, and can display the size of the defects through waveforms. It also has good portability and field applicability, accurately and efficiently detecting hidden defects in traction steel belts, and can be used in conjunction with manual visual inspection and maintenance to promptly address problems that occur in the steel belt.

[0008] The technical solution adopted by this invention to solve its technical problem is:

[0009] A handheld traction steel belt magnetic leakage detection device includes an outer frame, an inner frame, a magnetization module, a magnetic field detection module, and a roller positioning module. The inner frame is installed inside the middle of the outer frame and is divided into an upper inner frame and a lower inner frame. The U-shaped arc surface formed by the upper and lower inner frames fits into the U-shaped arc surface inside the magnetization module. The magnetic field detection module is installed inside the upper and lower inner frames. The middle part between the upper and lower inner frames is a detection channel for the traction steel belt to be tested to pass through. The detection end of the magnetic field detection module is aligned with the detection channel. A roller frame is installed on each side of the outer frame. Roller positioning modules are installed on the upper and lower sides of the roller frames respectively. The positioning station between the rollers of the two roller positioning modules is a positioning station for the traction steel belt to be tested to pass through and be positioned.

[0010] Furthermore, the outer U-shaped arc surface of the magnetization module is in contact with the inner U-shaped arc surface of the outer frame, and the inner U-shaped arc surface of the magnetization module is in contact with the outer U-shaped arc surface formed by the upper inner frame and the lower inner frame. The magnetization module has a space in the middle to accommodate the upper inner frame, the lower inner frame and the traction steel strip to be tested. The magnetization module forms a magnetic field in the structural space formed by the outer frame to magnetize the traction steel strip to be tested.

[0011] Preferably, the magnetization module includes an electromagnetic pure iron and two U-shaped permanent magnets, with the two U-shaped permanent magnets respectively placed on both sides of the electromagnetic pure iron.

[0012] Furthermore, there are two magnetic field detection modules. One magnetic field detection module is fixed on the upper inner frame, and the detection end of the other magnetic field detection module is located at the lower part and aligned with the detection channel. The other upper inner frame is fixed on the lower inner frame, and the detection end of the other magnetic field detection module is located at the upper part and aligned with the detection channel. The detection ends of the two magnetic field detection modules are staggered.

[0013] Preferably, the magnetic field detection module includes a signal processing element, a Hall sensor array board, an audible and visual alarm, a signal conditioner, and a data acquisition card. Each output channel of the Hall sensor array board is connected to the data acquisition card, the data acquisition card is connected to the signal conditioner, the signal conditioner is connected to the signal processing element, and the signal processing element is connected to the alarm.

[0014] Preferably, the device further includes a power module, which is placed in the internal space of the upper or lower inner rack. The power module is connected to the magnetic field detection module and provides power to the magnetic field detection module to enable it to operate and detect. The power module is also equipped with a Type-C charging interface. When the power supply is depleted, it can be replaced to increase the device's battery life, while the original power supply can be reused for charging.

[0015] Furthermore, the roller positioning module includes a roller shaft, a spring, a nut, a roller connector, and a roller. The roller is rotatably mounted on the roller shaft, the roller shaft is mounted on the roller connector, the roller connector is movably fitted onto a limiting screw, the limiting screw is fixed to the roller bracket, the spring is fitted onto the limiting screw, and the nut is installed on the limiting screw passing through the roller connector.

[0016] The device also includes two anti-deviation rollers, which are positioned between the upper inner frame and the lower inner frame, at the front and rear sides of the connection. The contact between the anti-deviation rollers and the traction steel belt to be tested is used to determine whether the testing device is in proper contact with the steel belt and whether it is parallel to both sides of the steel belt.

[0017] The device also includes a built-in roller, which is installed in the upper or lower inner frame. The built-in roller and the magnetic field detection module are arranged back and forth along the running direction of the traction steel belt to be tested. The built-in roller is partially exposed and in contact with the traction steel belt to be tested. Its protruding part lifts the steel belt to amplify all the original defects of the steel belt and increase the magnetic field exposed under the magnetization effect.

[0018] A handle is installed on the protruding part on the outer side of the main body of the outer frame. The handle is connected to a handle connector, and the handle connector is fixed to the outer side of the main body of the outer frame. The handle is a soft rubber material, and the two ends of the handle are provided with sliding grooves that are tangent to the shaft inside the handle connector.

[0019] The beneficial effects of this invention are mainly reflected in the following aspects: Through closed magnetic circuit design and strong excitation, it can effectively penetrate the surface polyurethane coating layer, causing the internal steel wires to reach magnetic saturation. This generates strong magnetic leakage signals for internal defects such as broken wires and pitting, solving the problem that visual inspection and resistance methods cannot detect internal defects. Employing a multi-channel, high-sensitivity Hall sensor array, corresponding to the steel wire strands, enables precise positioning of defects in both the width and length directions of the steel strip. Compared to the eddy current method, magnetic leakage technology is less affected by lift-off effects and material electromagnetic properties, allowing for deeper detection, higher signal-to-noise ratio, and more stable and reliable results on ferromagnetic materials like steel strips. Real-time display of multi-channel waveforms, LED indicator lights on the defective steel wire strands, and audible and visual alarms transform abstract defect information into intuitive visual and auditory feedback, greatly reducing the interpretation threshold for operators and improving detection efficiency. The handheld handle is lightweight, flexible, and retractable. The adaptive fitting structure of the magnetized unit constrains the steel strip in the center of the structure, enabling detection on both the top and bottom sides. This perfectly meets the needs of on-site elevator maintenance and overcomes the shortcomings of large online systems, such as being immobile and costly. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the handheld traction steel belt leakage magnetic field detection device of the present invention;

[0021] Figure 2 This is an exploded view of the structure of the handheld traction steel belt leakage magnetic field detection device of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the roller positioning module of the present invention;

[0023] Figure 4 This is a schematic diagram showing the position of the anti-deviation roller of the present invention.

[0024] Figure 5 This is a schematic diagram of the installation position of the handle of the present invention.

[0025] Figure 6 This is a schematic diagram showing the positions of the handle connector screw and the connecting frame screw of the present invention.

[0026] The components are as follows: 1-Outer frame: 11-Outer frame body; 12-Handle connector; 13-Handle; 14-First screw; 15-Second screw; 2-Inner frame: 21-Upper inner frame; 22-Lower inner frame; 23-Third screw; 24-Side plate; 3-Roller frame; 4-Magnetic module: 41-U-shaped permanent magnet; 42-U-shaped electromagnetic pure iron; 5-Magnetic field detection module: 51-Signal processing element; 52-Hall sensor array board; 53-Display; 6-Power module; 7-Roller positioning module: 71-Roller; 72-Nut; 73-Roller shaft; 74-Roller connector; 75-Spring; 8-Anti-deviation roller; 9-Built-in roller; 10-Indicator light. Detailed Implementation

[0027] The present invention will now be further described with reference to the accompanying drawings.

[0028] Reference Figures 1-6 A handheld traction steel belt magnetic leakage detection device includes an outer frame 1, an inner frame 2, a magnetization module 4, a magnetic field detection module 5, and a roller positioning module 7. The inner frame 2 is installed in the middle of the outer frame 1 and is divided into an upper inner frame 21 and a lower inner frame 22. The U-shaped arc surface formed by the upper inner frame 21 and the lower inner frame 22 fits against the inner U-shaped arc surface of the magnetization module 4. The magnetic field detection module 5 is installed inside the upper inner frame 21 and the lower inner frame 22. The middle part between the upper inner frame 21 and the lower inner frame 22 is a detection channel for the traction steel belt to be tested to pass through. The detection end of the magnetic field detection module 5 is aligned with the detection channel. A roller frame 3 is installed on each side of the outer frame 1. The roller positioning module 7 is installed on the upper and lower sides of the roller frame 3 respectively. The position between the rollers of the two roller positioning modules 7 is a positioning station for the traction steel belt to be tested to pass through and be positioned.

[0029] Furthermore, the outer U-shaped arc surface of the magnetization module 4 is in contact with the inner U-shaped arc surface of the outer frame 1, and the inner U-shaped arc surface of the magnetization module 4 is in contact with the outer U-shaped arc surface formed by the upper inner frame 21 and the lower inner frame 22. The magnetization module 4 has a space in the middle to accommodate the upper inner frame 21, the lower inner frame 22 and the traction steel strip to be tested. The magnetization module 4 forms a magnetic field in the structural space formed with the outer frame 1 to magnetize the traction steel strip to be tested.

[0030] Preferably, the magnetization module 4 includes an electromagnetic pure iron 42 and two U-shaped permanent magnets 41, with the two U-shaped permanent magnets 41 respectively placed on both sides of the electromagnetic pure iron 42.

[0031] Furthermore, there are two magnetic field detection modules 5. One magnetic field detection module is fixed on the upper inner frame 21, and the detection end of the magnetic field detection module is located at the lower part and aligned with the detection channel. The other upper inner frame is fixed on the lower inner frame 22, and the detection end of the other magnetic field detection module is located at the upper part and aligned with the detection channel. The detection ends of the one magnetic field detection module and the other magnetic field detection module are staggered.

[0032] Preferably, the magnetic field detection module 5 includes a signal processing element 51, a Hall sensor array board 52, an audible and visual alarm, a signal conditioner, and a data acquisition card. Each output channel of the Hall sensor array board 52 is connected to the data acquisition card, the data acquisition card is connected to the signal conditioner, the signal conditioner is connected to the signal processing element 51, and the signal processing element 51 is connected to the audible and visual alarm.

[0033] Preferably, the device further includes a power module 6, which is placed in the internal space of the upper inner frame 21 or the lower inner frame 22. The power module 6 is connected to the magnetic field detection module 5 and provides power to the magnetic field detection module 5 to enable it to operate and detect. The power module 6 is also equipped with a Type-C charging interface. When the power supply is depleted, it can be replaced to increase the device's battery life, while the original power supply can be recharged and reused.

[0034] Furthermore, the roller positioning module 7 includes a roller shaft 73, a spring 75, a nut 72, a roller connector 74, and a roller 71. The roller 71 is rotatably mounted on the roller shaft 73, the roller shaft 73 is mounted on the roller connector 74, the roller connector 74 is movably mounted on a limiting screw, the limiting screw is fixed on the roller bracket 3, the spring 75 is mounted on the limiting screw, and the nut 72 is mounted on the limiting screw that passes through the roller connector 74.

[0035] The device also includes two anti-deviation rollers 8, which are positioned between the upper inner frame and the lower inner frame, at the front and rear sides of the connection. The contact between the anti-deviation rollers and the traction steel belt to be tested is used to determine whether the testing device is in proper contact with the steel belt.

[0036] The device also includes a built-in roller 9, which is installed in the upper inner frame 21 or the lower inner frame 22. The built-in roller 9 and the magnetic field detection module 5 are arranged back and forth along the running direction of the traction steel belt to be tested. Part of the built-in roller 9 is exposed and in contact with the traction steel belt to be tested. Its protruding part lifts the steel belt to amplify all the original defects of the steel belt and increase the magnetic field exposed under the magnetization effect.

[0037] The outer frame 1 has a U-shaped accommodating space for the installation and housing of the magnetization module 4. Its inner U-shaped arc surface fits into the outer U-shaped arc surface of the magnetization module 4. There are four connection holes on each side of the outer frame 1, for connecting the two roller frames 3 located at both ends. A handle 13 is installed on the outer protruding part.

[0038] The inner frame 2 is installed inside the middle of the outer frame 1, and is divided into an upper inner frame 21 and a lower inner frame 22. The two have the same structure. The upper inner frame has a rectangular opening, and the lower inner frame has a rectangular protrusion. The two can be connected to each other. The power module 6, the magnetic field detection module 5, the built-in roller 9, and the anti-deviation roller 8 are installed inside. There is a connecting hole on each side of the inner frame 2 for connecting to the outer frame 1. The U-shaped arc surface formed by the upper inner frame 21 and the lower inner frame 22 is used to fit with the inner U-shaped arc surface of the magnetization module 4. The inner frame contains space for accommodating the power module 6 and the magnetic field detection module 5, and also has space for accommodating the built-in roller 9 and the anti-deviation roller 8. There are two holes on the other side for connecting the side plate 24.

[0039] Two roller frames 3 are installed on each side of the outer frame 1. Two connecting holes are provided on one side for connecting to the outer frame 1. Roller positioning modules 5 are installed on the upper and lower sides of the roller frame 3 to reduce friction on the steel strip and to grip the steel strip.

[0040] The audible and visual alarm is an indicator light 10, which is placed on the outside of the upper inner frame 21 and the lower inner frame 22. The indicator light 10 is used to display the magnetic field changes detected by the magnetic field detection module 5 in the magnetic field. The state of the indicator light indicates the defects inside the steel strip. The tail end of the indicator light is connected to the signal processing element 51.

[0041] The magnetization module 4 is connected to the outer frame 1 via an elastic support mechanism. This design enables the magnetization module to have self-adaptive fitting capability, maintaining good contact between the magnetic pole shoe and the steel strip surface during the testing process. This effectively counteracts lift-off fluctuations caused by manual operation or uneven surfaces, ensuring stable magnetization results.

[0042] The indicator light 10 is an LED group, with each LED corresponding to two channels of the sensor array. When a defect is detected by a certain channel, the main control unit drives the corresponding LED to light up, thus visually indicating the specific wire strand where the defect is located.

[0043] The magnetic circuit detection device 5 also includes a display screen 53, which displays the detected defect waveform and synchronously displays the detection signal of the corresponding array plate on the screen to dynamically display the current detection parameters, such as magnetization intensity and power, facilitating user monitoring of the equipment's operating status. The display screen 53 is connected to the signal processing element 51 in the magnetic field detection module 5, and its core function is to visualize the detection results and enable human-computer interaction. It can intuitively present the magnetic field anomalies on the steel strip surface in two-dimensional or three-dimensional image form, allowing operators to accurately locate the defect. When a defect is detected, the display can highlight the defect area, record the number, size, and location history of defects, and trigger indicator light alarms, greatly improving the timeliness and accuracy of detection.

[0044] Operators can directly set detection parameters, call different detection programs, generate and export detection reports on the display screen 53, which improves the intelligence level and ease of operation of the equipment.

[0045] In this embodiment, the outer frame body 11 provides structural support and installation reference for the entire device. A handle 13 is installed on the outer protrusion, and the handle connector 12 is connected by a first screw 14. The handle connector 12 is connected to the handle 13. Holes for connecting the roller frame 3 are provided on both sides of the outer frame body 11. A groove is provided in the center of the outer frame body 11 to accommodate the U-shaped permanent magnet 41 and the U-shaped electromagnetic pure iron 42. (See also...) Figure 4As shown, the groove is designed to prevent the U-shaped permanent magnet and the U-shaped electromagnetic pure iron from colliding and vibrating back and forth due to gaps in their internal assembly during installation and use. Two U-shaped permanent magnets are placed on either side of the electromagnetic pure iron 42 to increase the magnetic field strength and quickly magnetize the steel strip. The U-shaped arc surfaces of the U-shaped permanent magnets and the U-shaped electromagnetic pure iron fit together with the U-shaped arc surface of the upper inner frame 21, establishing a stable magnetic field in the detection area to saturate the steel strip and facilitate the effective capture of leakage magnetic fields caused by defects. The upper inner frame 21 is fixed inside the outer frame body 11 by side plates 24 and third screws 23. The lower inner frame 22 is also fixed inside the outer frame body 11 by side plates 24 and third screws 23, forming a stable detection space. The inner frame contains a magnetic field detection module 5, a power supply module 6, and an internal roller 9. The internal roller 9 is used to lift the steel strip during the detection process, amplifying the defects inside the steel strip so that the Hall sensor array board 52 can capture the magnetic field changes. The magnetic field detection and analysis unit 51 then processes the circuit signal and transmits it to the corresponding indicator light 10 to illuminate, while simultaneously controlling the display 53 to display the defect waveform size. The roller frame 3 is equipped with two roller positioning modules 7 for fixing the structure and increasing stability. The roller positioning module 7 is described in [reference needed]. Figure 3 As shown, the upper and lower rollers 71 are used to connect to the steel belt for testing. The upper and lower rollers 71 contact the steel belt, and the spring 75 rebounds under force, so that the upper and lower rollers 71 form pressure on the steel belt, which plays a clamping role to prevent the testing device from falling vertically due to the personnel letting go during the testing process.

[0046] In this embodiment, see Figure 4 As shown, the anti-deviation roller 8 is installed at the joint between the two upper inner frames 21. The anti-deviation roller 8 is symmetrically arranged on one side of the steel belt to ensure that the steel belt is in the correct position of the detection device when the detection starts, and to ensure that it travels smoothly along the preset path, avoiding detection errors caused by deviation.

[0047] In this embodiment, see Figure 2 As shown, the magnetic field detection module 5 includes a magnetic field detection and analysis unit 51 and a Hall sensor array board 52. The Hall sensor array board 52 is arranged above the steel strip's travel path to collect real-time magnetic field distribution data on the steel strip surface and transmit the signal to the magnetic field detection and analysis unit 51 for processing and analysis. It identifies whether there is a defect signal and then transmits the identification result to the indicator light 10 through the circuit to display the defect status of the corresponding steel strip.

[0048] In this embodiment, see Figure 3As shown, the roller positioning module 7 includes a roller 71, a roller shaft 73, a roller connector 74, a spring 75, and a nut 72. The roller 71 is connected to the roller connector 74 via the roller shaft 73. The spring 75 provides axial clamping force, and the nut 72 is used to adjust the clamping degree to ensure that the steel strip is clamped tightly and does not loosen or jump during the testing process.

[0049] In this embodiment, see Figure 4 As shown, the lower inner frame 22 has a rectangular protrusion that is used to connect with the rectangular recess of the upper inner frame 21, and the two are mutually constrained.

[0050] In this embodiment, see Figure 5 As shown, a handle 13 is installed on the protruding part of the outer frame body 11. It is connected to the outer frame body 11 through the handle connector 12. The handle 13 is a soft rubber material with grooves at both ends that are tangent to the shaft in the handle connector 12. When a person lifts the handle 13, the handle 13 will deform and protrude along the groove to form a shape that fits the grip. When not in use, it will return to flat, realizing the telescopic deformation.

[0051] The embodiments described in this specification are merely examples of implementations of the inventive concept and are for illustrative purposes only. The scope of protection of this invention should not be considered limited to the specific forms described in these embodiments; rather, it extends to equivalent technical means conceived by those skilled in the art based on the inventive concept.

Claims

1. A handheld traction steel belt leakage magnetic field detection device, characterized in that, The system includes an outer frame, an inner frame, a magnetization module, a magnetic field detection module, and a roller positioning module. The inner frame is installed inside the middle of the outer frame and consists of an upper inner frame and a lower inner frame. The U-shaped arc surface formed by the upper and lower inner frames fits into the U-shaped arc surface inside the magnetization module. The magnetic field detection module is installed inside the upper and lower inner frames. The middle section between the upper and lower inner frames is a detection channel for the traction steel belt to be tested to pass through. The detection end of the magnetic field detection module is aligned with the detection channel. A roller frame is installed on each side of the outer frame. Roller positioning modules are installed on the upper and lower sides of the roller frames respectively. The position between the rollers of the two roller positioning modules is a positioning station for the traction steel belt to be tested to pass through and be positioned. The roller positioning module includes a roller shaft, a spring, a nut, a roller connector, and a roller. The roller is rotatably mounted on the roller shaft, the roller shaft is mounted on the roller connector, the roller connector is movably fitted onto a limiting screw, the limiting screw is fixed to a roller bracket, the spring is fitted onto the limiting screw, and the nut is installed on the limiting screw passing through the roller connector. The device also includes a built-in roller, which is installed in the upper or lower inner frame. The built-in roller and the magnetic field detection module are arranged back and forth along the running direction of the traction steel belt to be tested. The built-in roller is partially exposed and in contact with the traction steel belt to be tested. Its protruding part lifts the steel belt to amplify all the original defects of the steel belt and increase the magnetic field exposed under the magnetization effect.

2. The handheld traction steel belt leakage magnetic field detection device as described in claim 1, characterized in that, The outer U-shaped arc surface of the magnetization module is in contact with the inner U-shaped arc surface of the outer frame, and the inner U-shaped arc surface of the magnetization module is in contact with the outer U-shaped arc surface formed by the upper inner frame and the lower inner frame. The magnetization module has a space in the middle to accommodate the upper inner frame, the lower inner frame and the traction steel strip to be tested. The magnetization module forms a magnetic field in the structural space formed by the magnetization module and the outer frame to magnetize the traction steel strip to be tested.

3. The handheld traction steel belt leakage magnetic field detection device as described in claim 2, characterized in that, The magnetization module includes an electromagnetic pure iron and two U-shaped permanent magnets, with the two U-shaped permanent magnets placed on both sides of the electromagnetic pure iron.

4. The handheld traction steel belt leakage magnetic field detection device as described in claim 1, characterized in that, There are two magnetic field detection modules. One magnetic field detection module is fixed on the upper inner frame, and the detection end of the other magnetic field detection module is located at the lower part and aligned with the detection channel. The other upper inner frame is fixed on the lower inner frame, and the detection end of the other magnetic field detection module is located at the upper part and aligned with the detection channel. The detection ends of the two magnetic field detection modules are staggered.

5. The handheld traction steel belt leakage magnetic field detection device as described in claim 4, characterized in that, The magnetic field detection module includes a signal processing element, a Hall sensor array board, an audible and visual alarm, a signal conditioner, and a data acquisition card. Each output channel of the Hall sensor array board is connected to the data acquisition card, the data acquisition card is connected to the signal conditioner, the signal conditioner is connected to the signal processing element, and the signal processing element is connected to the alarm.

6. A handheld traction steel belt leakage magnetic field detection device as described in claim 4 or 5, characterized in that, The device also includes a power module, which is placed in the internal space of the upper or lower inner rack. The power module is connected to the magnetic field detection module and provides power to the magnetic field detection module to enable it to operate and detect. The power module is also equipped with a Type-C charging interface. When the power supply is depleted, it can be replaced to increase the device's battery life, while the original power supply can be reused for charging.

7. The handheld traction steel belt leakage magnetic field detection device as described in claim 1, characterized in that, The device also includes two anti-deviation rollers, which are placed between the upper inner frame and the lower inner frame, with the two anti-deviation rollers located at the front and rear sides of the connection.

8. The handheld traction steel belt leakage magnetic field detection device as described in claim 1, characterized in that, A handle is installed on the protruding part on the outer side of the main body of the outer frame. The handle is connected to a handle connector, and the handle connector is fixed to the outer side of the main body of the outer frame. The handle is a soft rubber material, and the two ends of the handle are provided with sliding grooves that are tangent to the shaft inside the handle connector.

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