Device for detecting suction force of magnetic feet of magnetic detector and use method of device

Abstract

The invention belongs to the technical field of magnetic particle detection, and relates to a device for detecting the suction force of a magnetic foot of a magnetic detector and a use method thereof. Comprising a spring frame, a filling cavity unit, a ferromagnetic device, a scale, a temperature sensor and a microprocessor, an axial through hole is formed in the spring frame, and a filling cavity array is symmetrically arranged in the spring frame along the axial through hole; the ferromagnetic device is fixedly arranged at one end of the axial through hole, and a force sensor is arranged at the end, facing the axial through hole, of the ferromagnetic device. The scale is arranged on the side wall of the spring frame; the temperature sensor and the microprocessor electrically connected with the temperature sensor are installed in the side wall of the spring frame in an embedded mode. According to the invention, rapid and accurate quantitative detection of the attraction consistency of the double magnetic feet of the magnetic detector can be realized, and the technical problem that a traditional method depends on artificial experience and lacks objective data support is effectively solved.

Description

Technical Field

[0001] This invention belongs to the field of magnetic particle testing technology, and relates to a magnetic foot attraction force detection device for magnetic detectors and its usage method. Background Technology

[0002] Magnetic particle testing, as one of the key methods for non-destructive testing of metal components in thermal power plants, is widely used to detect surface and near-surface defects in pressure-bearing equipment such as boiler pipes, turbine blades, and pressure vessels. This technology applies a magnetic field to the surface of a workpiece, utilizing the aggregation of magnetic particles to reveal the defect morphology, thereby enabling rapid identification of defects such as cracks and inclusions.

[0003] In practice, magnetic detectors typically form a closed magnetic circuit by contacting the workpiece surface with a pair of magnetic feet. If the magnetic attraction of the two magnetic feet is inconsistent, it will cause a shift in the magnetic field distribution, resulting in uneven coverage of the inspected area. This can lead to missed defects or misjudgments, severely impacting the accuracy of equipment safety assessments. Currently, there is a lack of quantitative measurement methods for the magnetic attraction of the magnetic feet during on-site testing. Operators mainly rely on touch or experience to judge whether the attraction is consistent. This method is highly subjective, has poor repeatability, and is greatly affected by the operator's skill level, failing to guarantee the objectivity and consistency of the test results.

[0004] Although some simple magnetic testing tools (such as magnetic test pieces or simple magnetometers) exist on the market, providing some assistance for magnetic particle testing, these tools have significant limitations in practical applications. These tools can typically only qualitatively determine the presence or approximate strength of magnetic force, and cannot achieve precise quantitative measurement and comparison of magnetic attraction. For example, magnetic test pieces mainly display defects through magnetic particle patterns, making it difficult to reflect the actual intensity distribution of the magnetic field; while simple magnetometers, although providing coarse magnetic field readings, have low accuracy, poor stability, and are easily affected by environmental interference, failing to meet the high-precision, repeatable, and traceable testing requirements of modern industry.

[0005] Furthermore, the testing environment is particularly complex in actual industrial settings such as thermal power plants. Metal scraps, dust, oil, and other contaminants may adhere to the magnetic feet or the surface of the testing tools, affecting the integrity of the magnetic circuit and the magnetic field distribution. Simultaneously, residual magnetism generated during equipment operation and strong electromagnetic fields from surrounding electrical equipment can severely interfere with magnetic force assessments. This interference not only masks the true magnetic force values ​​but may also distort the detection signal, leading to misjudgments or missed detections, ultimately affecting the accurate assessment of the equipment's safety status. Summary of the Invention

[0006] To address the problems in the prior art, this invention provides a magnetic foot attraction force detection device and its usage method for magnetic detectors, which can accurately quantify magnetic foot attraction force, has strong anti-interference ability, is easy to operate, and improves the reliability of magnetic particle detection.

[0007] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides a magnetic foot attraction detection device for a magnetic detector, comprising a spring frame, a filling cavity unit, a ferromagnetic device, a scale, a temperature sensor, and a microprocessor; the spring frame has an axial through hole inside, and a filling cavity array is symmetrically arranged along the axial through hole inside the spring frame; the filling cavity array includes multiple filling cavity units that are fitted together; a silicone layer and a polyurethane foam layer are sequentially arranged in the filling cavity unit from the end adjacent to the axial through hole in a radially outward direction; the ferromagnetic device is fixedly arranged at one end of the axial through hole, and a force-sensitive sensor is provided at the end of the ferromagnetic device facing the axial through hole; the scale is arranged on the side wall of the spring frame; the temperature sensor and the microprocessor electrically connected to the temperature sensor are both embedded in the side wall of the spring frame.

[0008] Preferably, the ferromagnetic device has a T-shaped structure, including a vertically arranged protrusion and a flat plate; the iron protrusion extends into the axial through hole, and the flat plate is fixedly connected to the side wall of the spring frame.

[0009] Preferably, the zero mark of the scale and the ferromagnetic device are located on opposite side walls of the spring frame.

[0010] Preferably, the axial length of the filling cavity array is less than the axial length of the spring frame.

[0011] Preferably, the filling cavity unit is a detachable structure, and its outer wall is connected to the inner wall of the spring frame by threads or snaps.

[0012] Preferably, the outer surface of the spring frame is provided with a longitudinal guide groove; the scale is slidably mounted on the side wall of the spring frame through the longitudinal guide groove.

[0013] Preferably, the ferromagnetic device is made of low-carbon steel.

[0014] Preferably, the spring frame is made of spring steel.

[0015] Preferably, the scale is made of ABS material.

[0016] Secondly, the present invention provides a method for using a magnetic foot attraction detection device for a magnetic detector, comprising the following steps: The end of the spring frame without the ferromagnetic device fixedly attached is tightly pressed against the adsorption surface of the first magnetic foot of the magnetic detector to be tested; the magnetic detector is turned on, so that the first magnetic foot generates a magnetic field, attracting the ferromagnetic device to move along the axial through hole towards the magnetic foot, and driving the spring frame to compress; after the displacement stabilizes, the first scale value displayed on the scale is read and recorded, the ambient temperature is monitored in real time by the temperature sensor, the microprocessor performs dynamic temperature compensation on the first scale value according to the temperature sensor data, and the first reading of the force sensor is recorded at the same time; The end of the spring frame without the ferromagnetic device fixedly attached is tightly pressed against the adsorption surface of the second magnetic foot of the magnetic detector to be tested; the magnetic detector is turned on, so that the second magnetic foot generates a magnetic field, attracting the ferromagnetic device to move along the axial through hole towards the magnetic foot, and driving the spring frame to compress; after the displacement stabilizes, the second scale value displayed on the scale is read and recorded, the ambient temperature is monitored in real time by the temperature sensor, the microprocessor performs dynamic temperature compensation on the second scale value according to the temperature sensor data, and the second reading of the force sensor is recorded at the same time; If the difference between the first and second scale values ​​is no greater than 0.5 mm and the difference between the first and second readings does not exceed 5% of the rated value, then the magnetic attraction force of the two magnetic feet is considered to be consistent; otherwise, the magnetic detector needs to be adjusted and calibrated.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The invention achieves precise conversion of magnetic attraction force into linear displacement through the elastic deformation characteristics of the spring frame. The silicone and polyurethane foam layers within the internal filling cavity effectively isolate external vibrations and prevent magnetic field interference. A force-sensitive sensor at the end of the ferromagnetic device directly senses changes in magnetic force, forming a dual measurement verification mechanism with the spring deformation mechanism. An embedded temperature sensor and microprocessor monitor the ambient temperature in real time and dynamically compensate for spring deformation, significantly suppressing temperature drift errors. A scale provides an intuitive visual reading of the displacement. This invention transforms the detection of consistent magnetic attraction force from subjective experience-based judgment to objective and precise quantification, greatly improving the reliability, repeatability, and anti-interference capability of the detection results. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a magnetic foot attraction detection device for a magnetic detector according to the present invention.

[0020] The components include: 1. Spring frame; 2. Filling cavity unit; 3. Ferromagnetic device; 4. Scale; 5. Longitudinal guide groove. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0027] The present invention will now be described in further detail with reference to the accompanying drawings: The first objective of this invention is to provide a magnetic foot attraction force detection device for magnetic detectors, such as... Figure 1 As shown, the device includes a spring frame 1, a filling cavity unit 2, a ferromagnetic device 3, a scale 4, a temperature sensor, and a microprocessor. The spring frame 1 has an axial through-hole, and a filling cavity array is symmetrically arranged along the axial through-hole inside the spring frame 1. The filling cavity array includes multiple fitted filling cavity units 2. A silicone layer and a polyurethane foam layer are sequentially arranged inside each filling cavity unit 2, starting from the end adjacent to the axial through-hole and moving radially outward from the axial through-hole. The ferromagnetic device 3 is fixedly disposed at one end of the axial through-hole, and a force sensor 8 is provided at the end of the ferromagnetic device 3 facing the axial through-hole. The scale 4 is disposed on the side wall of the spring frame 1. The temperature sensor and the microprocessor electrically connected to the temperature sensor are both embedded in the side wall of the spring frame 1.

[0028] The magnetic particle testing device of this invention achieves precise conversion of magnetic attraction force into linear displacement through the elastic deformation characteristics of the spring frame 1. Its internal axial through-hole provides a precise guiding path for magnetic force transmission. The symmetrically distributed filling cavity unit 2, through a composite buffer structure of silicone and polyurethane foam layers, effectively isolates external vibrations and avoids interference with the detection magnetic field, ensuring the stability and accuracy of the measurement process. The force-sensitive sensor at the end of the ferromagnetic device 3 can directly sense changes in magnetic force, forming a dual measurement and verification mechanism with the spring deformation mechanism, significantly improving the reliability of the data and the authority of the measurement results. The temperature sensor and microprocessor are embedded in the side wall of the spring frame 1, monitoring the ambient temperature in real time and dynamically compensating for the elastic coefficient of the spring material based on the microprocessor's built-in algorithm, effectively suppressing measurement deviations caused by temperature drift and ensuring the consistency of test results under different working conditions. The scale 4 is used to intuitively display the displacement, realizing the visualization and recordability of the quantitative reading of magnetic attraction force. This invention's device exhibits excellent anti-interference capability and accuracy in complex industrial environments, realizing the transformation of magnetic foot attraction force consistency detection from subjective experience judgment to objective quantitative measurement, significantly improving the reliability and accuracy of magnetic particle testing results.

[0029] The ferromagnetic device 3 has a T-shaped structure, including a vertically arranged protrusion and a flat plate. The protrusion extends into the axial through hole, and the flat plate is fixedly connected to the side wall of the spring frame 1. The protrusion's extension into the axial through hole allows it to directly and fully sense the magnetic field and receive magnetic force, ensuring the sensitivity of the magneto-force conversion. The fixed connection between the flat plate and the side wall of the spring frame 1 ensures both the mechanical stability of the overall structure and the uniform transmission of magnetic force to the spring frame 1, avoiding localized stress concentration.

[0030] The zero mark of the scale 4 and the ferromagnetic device 3 are located on opposite side walls of the spring frame 1. The zero mark is aligned with the side wall of the spring frame 1 away from the ferromagnetic device 3, so that when the ferromagnetic device 3 is attracted by the magnetic force, the compression deformation of the spring frame 1 can be directly converted into a positively increasing scale reading on the scale, realizing a linear correspondence between displacement and reading.

[0031] The axial length of the filling cavity array is less than the axial length of the spring frame 1. When the spring frame 1 is subjected to magnetic compression, it can achieve sufficient and linear elastic deformation, avoiding deformation limitation or nonlinear response caused by interference from the filling cavity array. The reserved deformation space ensures that the spring frame always operates within its elastic range, which not only improves the accuracy and linearity of the measurement but also effectively prevents permanent deformation that may be caused by overload, extending the service life of the device.

[0032] The filling cavity unit 2 is a detachable structure, and its outer wall is connected to the inner wall of the spring frame 1 by threads or snaps, enabling quick assembly and disassembly, which greatly simplifies the maintenance process. This invention supports independent replacement of a single filling cavity unit 2, significantly reducing maintenance costs.

[0033] The outer surface of the spring frame 1 is provided with a longitudinal guide groove 5; the scale 4 is slidably mounted on the side wall of the spring frame 1 through the longitudinal guide groove 5. During the deformation of the spring frame 1, the scale 4 can slide along the longitudinal guide groove to a safe distance, completely avoiding contact interference with the spring frame 1 and ensuring free and linear deformation. After the deformation of the spring frame 1 stabilizes, the scale 4 can be slid to make its zero mark accurately fit the end face of the spring frame 2, directly eliminating visual errors caused by viewing distance and angle.

[0034] This invention achieves an optimal balance between magnetic force transmission performance and structural strength by using ferromagnetic materials such as low-carbon steel, iron, cobalt, or nickel to fabricate the ferromagnetic device 3. Low-carbon steel has good magnetic permeability and machinability, ensuring efficient magnetic force transmission and easy precision machining; iron has high saturation magnetic induction intensity, making it suitable for strong magnetic field environments; cobalt has a high Curie temperature and excellent magnetic stability, ensuring reliability under high-temperature conditions; and nickel has good corrosion resistance and ductility, extending the device's service life.

[0035] The spring frame 1 is made of spring steel (such as carbon spring steel, alloy spring steel, etc.). Spring steel has excellent elastic limit and fatigue strength, ensuring that the frame maintains linear deformation characteristics during repeated compression, providing a stable and reliable mechanical basis for magnetic force measurement. Its high yield strength can effectively prevent plastic deformation, ensuring the long-term accuracy of measurement results. At the same time, the good non-magnetic properties of spring steel avoid interference with external magnetic fields, ensuring that the test data truly reflects the attraction performance of the magnetic field itself.

[0036] The scale 4 is made of acrylonitrile butadiene styrene (ABS) copolymer. ABS material possesses excellent dimensional stability and mechanical strength, ensuring that the scale maintains accurate graduations and remains undeformed during long-term use. Its completely non-magnetic nature fundamentally eliminates any interference from the detection magnetic field, guaranteeing the authenticity and accuracy of the measurement data. This material also exhibits good resistance to environmental stress cracking and abrasion, enabling it to meet the challenges of complex industrial operating conditions.

[0037] Example 1 A magnetic foot attraction force detection device for a magnetic detector, comprising: The spring frame 1 has an axial through hole inside; it is made of 65Mn spring steel with a spring wire diameter of 2mm, a number of turns ≥20, a free length ≥50mm, and a stiffness coefficient of 5N / mm, ensuring that stable linear compression can be generated under magnetic force.

[0038] The filling cavity unit 2 is symmetrically arranged along the axial through hole; it includes four fitted filling cavity units 2, which are non-ferromagnetic to avoid interfering with magnetic field detection. Inside the filling cavity unit 2, starting from the end adjacent to the axial through hole, a silicone layer and a polyurethane foam layer are sequentially arranged radially outward along the axial through hole. The ferromagnetic device 3 is fixedly installed at one end of the axial through hole. It is made of low carbon steel and has a T-shaped structure. The T-shaped structure includes a vertically arranged protrusion and a flat plate. The protrusion extends into the axial through hole, and the flat plate is fixedly connected to the side wall of the spring frame 1.

[0039] The scale 4 is set on the side wall of the spring frame 1, with its zero mark aligned with the side wall of the spring frame 1 away from the ferromagnetic device 3. The scale 4 is made of ABS material, with the scale unit being mm, a measurement range of 0~50mm, an accuracy of ±0.1mm, and the scale line parallel to the axis of the spring frame 1.

[0040] The force sensor is a miniature S-shaped tension and compression sensor, which is fixedly installed at the center of the end of the ferromagnetic device 3 facing the axial through hole by means of threaded connection. The range is 0~200N, the accuracy class is 0.5, and it monitors the magnetic attraction force value in real time.

[0041] The temperature sensor, a PT100 platinum resistance temperature sensor, is embedded in the side wall of the spring frame 1. It has a measurement range of -20℃ to 80℃ and an accuracy of ±0.5℃, and monitors changes in ambient temperature in real time.

[0042] The microprocessor, which adopts a 32-bit ARM Cortex-M4 core processor, is embedded in the side wall of the spring frame 1. It has a built-in temperature compensation algorithm that can perform real-time dynamic compensation of the spring deformation based on temperature sensor data.

[0043] Example 2 A magnetic foot attraction force detection device for a magnetic detector, comprising: The spring frame 1 has an axial through hole inside; it is made of 60Si2Mn spring steel with a spring wire diameter of 3mm, a number of turns ≥20, a free length ≥50mm, and a stiffness coefficient of 8N / mm, ensuring that stable linear compression can be generated under magnetic force.

[0044] The filling cavity unit 2 is symmetrically arranged along the axial through hole; it includes 8 fitted filling cavity units 2, which are non-ferromagnetic to avoid interfering with magnetic field detection. Inside the filling cavity unit 2, starting from the end adjacent to the axial through hole, a silicone layer and a polyurethane foam layer are sequentially arranged radially outward along the axial through hole. The ferromagnetic device 3 is fixedly installed at one end of the axial through hole. It is made of iron-nickel alloy and has a T-shaped structure. The T-shaped structure includes a vertically arranged protrusion and a flat plate. The protrusion extends into the axial through hole, and the flat plate is fixedly connected to the side wall of the spring frame 1.

[0045] The scale 4 is set on the side wall of the spring frame 1, with its zero mark aligned with the side wall of the spring frame 1 away from the ferromagnetic device 3. The scale 4 is made of ABS material, with the scale unit being mm, a measurement range of 0~50mm, an accuracy of ±0.1mm, and the scale line parallel to the axis of the spring frame 1.

[0046] The force sensor is a miniature beam strain sensor, which is fixedly installed at the center of the end of the ferromagnetic device 3 facing the axial through hole by means of threaded connection. It has a range of 0~200N and an accuracy class of 0.5, and monitors the magnetic attraction force value in real time.

[0047] The temperature sensor, a PT100 platinum resistance temperature sensor, is embedded in the side wall of the spring frame 1. It has a measurement range of -20℃ to 80℃ and an accuracy of ±0.5℃, and monitors changes in ambient temperature in real time.

[0048] The microprocessor, a GD32VF103 series processor with RISC-V architecture, is embedded in the side wall of the spring frame 1. It has a built-in temperature compensation algorithm that can dynamically compensate for the spring deformation in real time based on temperature sensor data.

[0049] A second objective of this invention is to provide a method of using a magnetic foot attraction detection device for a magnetic detector, comprising the following steps: One end of the spring frame 1 without the ferromagnetic device 3 fixedly attached is tightly attached to the adsorption surface of the first magnetic foot of the magnetic detector to be tested; the magnetic detector is turned on, so that the first magnetic foot generates a magnetic field, attracting the ferromagnetic device 3 to move along the axial through hole towards the magnetic foot, and driving the spring frame 1 to compress; after the displacement stabilizes, the first scale value displayed on the scale 4 is read and recorded, the ambient temperature is monitored in real time by the temperature sensor, the microprocessor performs dynamic temperature compensation on the first scale value according to the temperature sensor data, and at the same time records the first reading of the force sensor; One end of the spring frame 1 without the ferromagnetic device 3 fixedly attached is tightly attached to the adsorption surface of the second magnetic foot of the magnetic detector to be tested; the magnetic detector is turned on, so that the second magnetic foot generates a magnetic field, attracting the ferromagnetic device 3 to move along the axial through hole towards the magnetic foot, and driving the spring frame 1 to compress; after the displacement stabilizes, the second scale value displayed on the scale 4 is read and recorded, the ambient temperature is monitored in real time by the temperature sensor, the microprocessor performs dynamic temperature compensation on the second scale value according to the temperature sensor data, and the second reading of the force sensor is recorded at the same time; If the difference between the first and second scale values ​​is no greater than 0.5 mm and the difference between the first and second readings does not exceed 5% of the rated value, then the magnetic attraction force of the two magnetic feet is considered to be consistent; otherwise, the magnetic detector needs to be adjusted and calibrated.

[0050] This invention achieves objective and quantitative detection of the consistency of magnetic particle inspection's dual magnetic foot attraction force by converting magnetic attraction force into precisely measurable mechanical displacement and electrical signals. The method introduces a dynamic temperature compensation mechanism, using a microprocessor to process temperature sensor data in real time, effectively eliminating the influence of ambient temperature changes on the spring elasticity coefficient and significantly improving measurement accuracy and reliability. Simultaneously, the use of a dual detection method combining displacement measurement and force sensors, along with a cross-validation mechanism, greatly enhances the credibility and authority of the detection results. This method is simple to operate and has clear judgment criteria, ensuring the stability and reliability of magnetic particle inspection quality, and providing a novel and precise quantitative solution for industrial non-destructive testing.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for detecting the magnetic attraction force of a magnetic probe's foot, characterized in that, The device includes a spring frame (1), a filling cavity unit (2), a ferromagnetic device (3), a scale (4), a temperature sensor, and a microprocessor. The spring frame (1) has an axial through hole inside, and a filling cavity array is symmetrically arranged inside the spring frame (1) along the axial through hole. The filling cavity array includes multiple filling cavity units (2) that are fitted together. A silicone layer and a polyurethane foam layer are arranged sequentially in the filling cavity unit (2) from the end adjacent to the axial through hole in the radial direction outward from the axial through hole. The ferromagnetic device (3) is fixedly arranged at one end of the axial through hole, and a force sensor is provided at the end of the ferromagnetic device (3) facing the axial through hole. The scale (4) is arranged on the side wall of the spring frame (1). The temperature sensor and the microprocessor electrically connected to the temperature sensor are both embedded in the side wall of the spring frame (1).

2. The magnetic foot attraction detection device for a magnetic detector according to claim 1, characterized in that, The ferromagnetic device (3) has a T-shaped structure, including a vertically arranged protrusion and a flat plate; the iron protrusion extends into the axial through hole, and the flat plate is fixedly connected to the side wall of the spring frame (1).

3. The magnetic foot attraction detection device for a magnetic detector according to claim 2, characterized in that, The zero mark of the scale (4) and the ferromagnetic device (3) are located on opposite side walls of the spring frame (1).

4. The magnetic foot attraction detection device for a magnetic detector according to claim 1, characterized in that, The axial length of the filling cavity array is less than the axial length of the spring frame (1).

5. The magnetic foot attraction detection device for a magnetic detector according to claim 1, characterized in that, The filling cavity unit (2) is a detachable structure, and its outer wall is connected to the inner wall of the spring frame (1) by threads or snaps.

6. The magnetic foot attraction detection device for a magnetic detector according to claim 1, characterized in that, The outer surface of the spring frame (1) is provided with a longitudinal guide groove (5); the scale (4) is slidably mounted on the side wall of the spring frame (1) through the longitudinal guide groove (5).

7. The magnetic foot attraction detection device for a magnetic detector according to claim 1, characterized in that, The ferromagnetic device (3) is made of low-carbon steel.

8. The magnetic foot attraction detection device for a magnetic detector according to claim 1, characterized in that, The spring frame (1) is made of spring steel.

9. A magnetic foot attraction detection device for a magnetic detector according to claim 1, characterized in that, The ruler (4) is made of ABS material.

10. A method of using a magnetic foot attraction detection device for a magnetic detector according to any one of claims 1 to 9, characterized in that, Includes the following steps: One end of the spring frame (1) without the fixed ferromagnetic device (3) is tightly attached to the adsorption surface of the first magnetic foot of the magnetic detector to be tested; the magnetic detector is turned on, so that the first magnetic foot generates a magnetic field, attracting the ferromagnetic device (3) to move along the axial through hole towards the magnetic foot, and driving the spring frame (1) to compress; after the displacement stabilizes, the first scale value displayed on the scale (4) is read and recorded, the ambient temperature is monitored in real time by the temperature sensor, the microprocessor performs dynamic temperature compensation on the first scale value according to the temperature sensor data, and at the same time records the first reading of the force sensor; One end of the spring frame (1) without the fixed ferromagnetic device (3) is tightly attached to the adsorption surface of the second magnetic foot of the magnetic detector to be tested; the magnetic detector is turned on, so that the second magnetic foot generates a magnetic field, attracting the ferromagnetic device (3) to move along the axial through hole towards the magnetic foot, and driving the spring frame (1) to compress; after the displacement stabilizes, the second scale value displayed on the scale (4) is read and recorded, the ambient temperature is monitored in real time by the temperature sensor, the microprocessor performs dynamic temperature compensation on the second scale value according to the temperature sensor data, and the second reading of the force sensor is recorded at the same time; If the difference between the first and second scale values ​​is no greater than 0.5 mm and the difference between the first and second readings does not exceed 5% of the rated value, then the magnetic attraction force of the two magnetic feet is considered to be consistent; otherwise, the magnetic detector needs to be adjusted and calibrated.

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