Method and device for measuring depth and area of corrosion pit in metal surface

Abstract

The invention relates to the field of metal detection equipment, and discloses a method and a device for measuring the depth and the area of a corrosion pit in a metal surface. An operation body shell is welded to the outer surface of a body mounting plate, a datum plate is fixedly connected to the outer surface of the side, away from the operation body shell, of a magnetic field generator, the outer surface of a connector is movably sleeved with a magnetic field expansion piece, and an outer supporting frame is fixedly connected to the outer surface of the datum plate; a limiting plate is fixedly connected to the outer surface of the side, away from the datum plate, of the outer supporting frame, and a counting frame is fixedly connected to the outer surface of the side, away from the main body mounting plate, of the limiting plate. The position of the counting frame corresponding to the inner surface of the magnetic field expansion piece is changed and fed back, and area measurement is completed by judging whether the surface of the corresponding position of the matrix type connector is a metal surface or not.

Description

Technical Field

[0001] The invention belongs to the technical field of metal detection equipment, and specifically relates to a method and a device for measuring the depth and area of ​​rust pits on a metal surface. Background Art

[0002] Rust pits on metal surfaces are a common phenomenon in the process of metal corrosion. The characteristics of metal corrosion depend on the type of metal and the environment in which it is located, and are usually manifested as rust holes, changes in color or gloss, and expanded and loose products. Especially for hydraulic steel gates, when immersed in seawater or fresh water and in an atmospheric corrosion environment, dense rust pits will gradually form on the surface of the structural steel. The depth, diameter-to-depth ratio distribution characteristics, quantity and change rules of these rust pits can be statistically studied through surface morphology test methods and corrosion characterization parameters, and the safety performance of metal structures can be judged.

[0003] Traditional methods for measuring the depth and area of ​​rust pits on metal surfaces include visual inspection, using magnifying glasses, microscopes, or cameras to magnify and observe rust pits, manually measuring the diameter or diagonal length of the pits, and calculating the area, and using a ruler or tape measure to directly measure the depth of the pits. Traditional detection methods are time-consuming and labor-intensive, and the detection cycle is long. Liquid and iron powder penetration methods are also used, but these methods are prone to further damage to the original metal surface, which is not conducive to the protection of metal structures. Summary of the invention

[0004] The purpose of the present invention is to provide a method and device for measuring the depth and area of ​​rust pits on a metal surface in order to solve the problem that the above-mentioned traditional visual inspection method, liquid, iron powder penetration method, etc. are time-consuming and labor-intensive and easily cause further damage to the original metal surface, which is not conducive to protection.

[0005] The technical solution adopted by the present invention is as follows: a method and device for measuring the depth and area of ​​rust pits on a metal surface, comprising a main body mounting plate, a running main body shell is welded to the outer surface of the main body mounting plate, a magnetic field generator is movably connected to the outer surface of the main body mounting plate corresponding to the running main body shell, a reference plate is fixedly connected to the outer surface of the magnetic field generator on a side away from the running main body shell, a connecting head is welded to the outer surface of the reference plate, a magnetic field expansion piece is movably sleeved on the outer surface of the connecting head, an outer support frame is fixedly connected to the outer surface of the reference plate, a limit plate is fixedly connected to the outer surface of the outer support frame on a side away from the reference plate, and a counting frame is fixedly connected to the outer surface of the limit plate on a side away from the main body mounting plate.

[0006] By adopting the above technical solution, a magnetic field is generated by a magnetic field generator, and then the magnetic field is extended through the contact between the connector and the magnetic field expansion piece. When the metal surface is displaced, the magnetic field is cut and the field strength is weakened. The position of the inner surface of the counting frame corresponding to the magnetic field expansion piece changes and feedback is generated. Whether the surface at the corresponding position of the matrix connector is a metal surface is determined to complete the area measurement. When the equipment is not moving, the magnetic field strength change of the magnetic field is generated by the magnetic field generator to complete the corresponding measurement.

[0007] In a preferred embodiment, a power line is fixedly connected to the outer surface of the magnetic field generator, a gyroscope is fixedly connected to the outer surface of one end of the power line away from the magnetic field generator, and the magnetic field generator is fixedly connected to the outer surface of the gyroscope.

[0008] By adopting the above technical solution, if the metal surface is ferrous metal, the magnetic field generated by the magnetic field generator is adsorbed at the magnetic field generator through the power cord, which is convenient for fixing the equipment on the metal surface, and then completing the detection of the reference plate. The gyroscope is convenient for detecting whether the equipment is level, and then facilitating the second servo motor to further adjust the equipment.

[0009] In a preferred embodiment, the outer surface of the reference plate is fixedly connected with a displacement tooth, and the outer surface of the displacement tooth is movably connected with an active tooth.

[0010] By adopting the above technical solution, the rotation of the first servo motor drives the active teeth, thereby completing the displacement of the displacement teeth and completing the adjustment of the measurement width of the reference plate.

[0011] In a preferred embodiment, a first servo motor is fixedly connected to the inner surface of the operating body housing corresponding to the driving tooth, and an outer surface of the output end of the first servo motor is fixedly connected to the driving tooth.

[0012] By adopting the above technical solution, the first servo motor provides mechanical power for the active gear.

[0013] In a preferred embodiment, a spectral scanner is fixedly connected to the outer surface of the main mounting plate, a second servo motor is fixedly connected to the outer surfaces of both sides of the main mounting plate, and a roller is fixedly connected to the outer surface of the output end of the second servo motor.

[0014] By adopting the above technical solution, the spectral scanner completes the detection of rusted metal surfaces, and at the same time assists the overall equipment in calibrating area detection. The horizontal position of the detection equipment is adjusted by rotating the second servo motor to drive the roller. When the magnetic field expansion piece and the magnetic field generator can be adsorbed, the upward and downward displacement can be performed.

[0015] In a preferred embodiment, a fixing tooth is welded to the outer surface of the upper end of the main body mounting plate, a transmission tooth is welded to the outer surface of the fixing tooth, and a mounting shell is welded to the outer surface of the transmission tooth.

[0016] By adopting the above technical solution, the gear inside the fixed tooth clamps the reference rope, thereby completing the lifting and lowering displacement of the detection equipment, the gear inside the transmission tooth completes the force, and the mounting housing provides a location for the installation of related mechanical parts.

[0017] In a preferred embodiment, a control motor is disposed on the inner surface of the installation shell, and a rotation speed counting unit is disposed on the inner surface of the installation shell beside the control motor.

[0018] By adopting the above technical solution, the rotation of the motor is controlled to drive the internal gear of the transmission tooth to rotate, and then the gear inside the tooth is fixed to clamp the reference rope, thereby completing the lifting and lowering of the detection equipment.

[0019] In a preferred embodiment, a reference rope is movably connected to the inner surface of the fixed tooth, and a cylinder is provided on the outer surface of one end of the reference rope away from the fixed tooth.

[0020] By adopting the above technical solution, the reference rope is lowered by the cylinder, and the extension and retraction of the cylinder can complete the left and right movement of the measuring device.

[0021] In a preferred embodiment, a fixing block is fixedly connected to the outer surface of the cylinder, and a displacement vehicle is provided on the outer surface of the fixing block.

[0022] By adopting the above technical solution, the displacement vehicle is placed on the upper surface of the pit, and the lateral movement of the entire lateral measurement position equipment is completed by moving forward and backward. The fixing block facilitates the forward extension of the cylinder to complete the fixation of the detection equipment.

[0023] A method and device for measuring the depth and area of ​​rust pits on a metal surface as described in claims 1-9, characterized in that the device is used as follows:

[0024] S1: Place the displacement vehicle on the upper surface of the pit, and move it forward and backward to complete the lateral movement of the entire lateral measurement position equipment. Lower the reference rope through the cylinder, and the extension and retraction of the cylinder can complete the left and right movement of the measurement equipment;

[0025] S2: Insert the speed counting unit into the fixed tooth, and by controlling the rotation of the motor, the corresponding gear inside the fixed tooth rotates to drive the overall measuring equipment to rise and fall. Under the measurement of equipment such as a spectrum scanner, the corresponding depth positioning is completed, and the speed counting unit obtains the depth parameters of the rust pits on the metal surface;

[0026] S3: The spectral scanner completes the scanning of the corresponding position, generates a magnetic field through the magnetic field generator, and then through the contact between the connector and the magnetic field expansion piece, the magnetic field is extended. When the metal surface is displaced, the magnetic field is cut, the field strength is weakened, and the counting frame changes and feedbacks the position of the inner surface of the magnetic field expansion piece corresponding to the position of the matrix connector. Whether the surface at the corresponding position is a metal surface is completed to measure the area. When the equipment is not moving, the magnetic field generator generates a change in the field strength of the magnetic field to complete the corresponding measurement;

[0027] S4: The measuring device is driven by the rotation of the first servo motor to complete the measurement of different widths.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0029] 1. In the present invention, a magnetic field is generated by a magnetic field generator, and then the magnetic field is extended through the contact between the connector and the magnetic field expansion member. When the metal surface is displaced, the magnetic field is cut and the field strength is weakened. The position of the inner surface of the counting frame corresponding to the magnetic field expansion member changes and feedback is generated. Whether the surface at the corresponding position of the matrix connector is a metal surface is determined to complete the area measurement. When the equipment is not moving, the field strength of the magnetic field is changed by the magnetic field generator to complete the corresponding measurement, and the spectral scanner completes the corresponding auxiliary measurement to make the measurement more accurate.

[0030] 2. In the present invention, the measuring device is driven by the rotation of the first servo motor to complete the measurement of different widths, and the reference rope is lowered by the cylinder. The extension and retraction of the cylinder can complete the left and right movement of the measuring device, which is convenient for the front, back, up and down detection settings. The detection device can be moved, and the device can adjust its position to detect targets or areas in different positions, thereby ensuring that each important part is accurately detected. During the movement, the device can adjust its position and direction in real time to obtain the best and clearest detection signal. Whether it is a space or an open environment, the left and right movement can help the device better adapt to the site conditions, thereby improving its flexibility and convenience of use. When the equipment needs to be calibrated or repaired, the left and right movement function can help the operator approach the equipment more conveniently and make necessary adjustments and maintenance work.

[0031] 3. In the present invention, the gyroscope is convenient for detecting whether the equipment is level, and then the second servo motor is convenient for further adjusting the equipment, further ensuring the running position of the detection equipment, and then ensuring the detection effect. This automated adjustment mechanism not only greatly improves the convenience and accuracy of equipment adjustment, but also further ensures the running position of the detection equipment. Therefore, the application of the gyroscope not only simplifies the process of equipment adjustment, but also plays a vital role in ensuring the detection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1It is a schematic diagram of the overall appearance of the device of the present invention;

[0033] Figure 2 It is a back view of the appearance of the device detection structure in the present invention;

[0034] Figure 3 This is a front view of the appearance of the device detection structure in the present invention;

[0035] Figure 4 This is a disassembly diagram of the device detection structure in the present invention;

[0036] Figure 5 This is a disassembly diagram of the main detection structure of the equipment in the present invention;

[0037] Figure 6 It is a schematic diagram of the internal structure of the lifting displacement in the present invention.

[0038] Markings in the figure: 1. Main body mounting plate; 2. Running body housing; 3. Magnetic field generator; 4. Reference plate; 5. Connector; 6. Magnetic field expansion member; 7. Outer support frame; 8. Limit plate; 9. Counting frame; 10. Power cord; 11. Gyroscope; 12. Magnetic field generator; 13. Displacement gear; 14. Active gear; 15. First servo motor; 16. Spectral scanner; 17. Second servo motor; 18. Roller; 19. Fixed gear; 20. Transmission gear; 21. Mounting housing; 22. Control motor; 23. Speed ​​counting unit; 24. Cylinder; 25. Fixed block; 26. Displacement vehicle; 27. Reference rope. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Example:

[0041] Reference Figure 1-5A method and device for measuring the depth and area of ​​rust pits on a metal surface, comprising a main body mounting plate 1, a running main body shell 2 is welded to the outer surface of the main body mounting plate 1, a magnetic field generator 3 is movably connected to the outer surface of the main body mounting plate 1 corresponding to the running main body shell 2, a reference plate 4 is fixedly connected to the outer surface of the magnetic field generator 3 on the side away from the running main body shell 2, a connector 5 is welded to the outer surface of the reference plate 4, a magnetic field expansion piece 6 is movably sleeved on the outer surface of the connector 5, an outer support frame 7 is fixedly connected to the outer surface of the reference plate 4, a limit plate 8 is fixedly connected to the outer surface of the outer support frame 7 on the side away from the reference plate 4, and a counting frame 9 is fixedly connected to the outer surface of the limit plate 8 on the side away from the main body mounting plate 1.

[0042] The magnetic field is generated by the magnetic field generator 3, and then the magnetic field is extended through the contact between the connector 5 and the magnetic field expansion member 6. When the metal surface is displaced, the magnetic field is cut and the field strength is weakened. The counting frame 9 changes and feeds back the position of the inner surface of the magnetic field expansion member 6 corresponding to the change. The area measurement is completed by determining whether the surface at the corresponding position of the matrix connector 5 is a metal surface. When the equipment is not moving, the magnetic field strength change of the magnetic field is generated by the magnetic field generator 3 to complete the corresponding measurement.

[0043] Reference Figure 1-4 A power line 10 is fixedly connected to the outer surface of the magnetic field generator 3 , a gyroscope 11 is fixedly connected to the outer surface of one end of the power line 10 away from the magnetic field generator 3 , and a magnetic field generator 12 is fixedly connected to the outer surface of the gyroscope 11 .

[0044] If the metal surface is ferrous metal, the magnetic field generated by the magnetic field generator 3 is adsorbed at the magnetic field generator 12 through the power cord 10, which is convenient for fixing the device on the metal surface, and then completing the detection of the reference plate 4. The gyroscope 11 is convenient for detecting whether the device is level, and then the second servo motor 17 is convenient for further adjusting the device.

[0045] Reference Figure 1-4 The outer surface of the reference plate 4 is fixedly connected with a displacement tooth 13 , and the outer surface of the displacement tooth 13 is movably connected with an active tooth 14 .

[0046] The rotation of the first servo motor 15 drives the active teeth 14 to move the displacement teeth 13 and adjust the measurement width of the reference plate 4 .

[0047] Reference Figure 1-4 A first servo motor 15 is fixedly connected to the inner surface of the operating body housing 2 corresponding to the driving tooth 14 , and an outer surface of the output end of the first servo motor 15 is fixedly connected to the driving tooth 14 .

[0048] The first servo motor 15 provides mechanical power to the driving gear 14 .

[0049] Reference Figure 1-4A spectrum scanner 16 is fixedly connected to the outer surface of the main mounting plate 1 , a second servo motor 17 is fixedly connected to the outer surfaces of both sides of the main mounting plate 1 , and a roller 18 is fixedly connected to the outer surface of the output end of the second servo motor 17 .

[0050] The spectral scanner 16 completes the detection of the rusted surface of the metal surface and assists the calibration of the area detection of the entire equipment. The horizontal position of the detection equipment is adjusted by rotating the second servo motor 17 to drive the roller 18. When the magnetic field expansion member 6 and the magnetic field generator 12 can be adsorbed, the upward and downward displacement can be performed.

[0051] Reference Figure 1-4 A fixing tooth 19 is welded on the outer surface of the upper end of the main mounting plate 1 , a transmission tooth 20 is welded on the outer surface of the fixing tooth 19 , and a mounting shell 21 is welded on the outer surface of the transmission tooth 20 .

[0052] The gear inside the fixed tooth 19 clamps the reference rope 27, thereby completing the lifting and lowering displacement of the detection equipment. The gear inside the transmission tooth 20 completes the force effect, and the mounting housing 21 provides a location for the installation of related mechanical parts.

[0053] Reference Figure 1-4 A control motor 22 is arranged on the inner surface of the mounting shell 21 , and a speed counting unit 23 is arranged on the inner surface of the mounting shell 21 next to the control motor 22 .

[0054] The rotation of the control motor 22 drives the internal gear of the transmission tooth 20 to rotate, and then the gear inside the fixed tooth 19 clamps the reference rope 27, thereby completing the lifting of the detection equipment.

[0055] Reference Figure 1 A reference rope 27 is movably connected to the inner surface of the fixed tooth 19 , and a cylinder 24 is provided on the outer surface of one end of the reference rope 27 away from the fixed tooth 19 .

[0056] The reference rope 27 is lowered by the cylinder 24, and the extension and retraction of the cylinder 24 can complete the left and right movement of the measuring device.

[0057] Reference Figure 1 A fixing block 25 is fixedly connected to the outer surface of the cylinder 24 , and a displacement vehicle 26 is arranged on the outer surface of the fixing block 25 .

[0058] The displacement vehicle 26 is placed on the upper surface of the pit, and the lateral movement of the entire lateral measurement position equipment is completed by moving forward and backward. The fixing block 25 facilitates the extension of the cylinder 24 to complete the fixation of the detection equipment.

[0059] Reference Figure 1-6 , a method and device for measuring the depth and area of ​​rust pits on metal surface, the method of using the device is as follows:

[0060] S 1: Place the displacement vehicle 26 on the upper surface of the pit, and complete the lateral movement of the entire lateral measurement position equipment by moving forward and backward. Lower the reference rope 27 through the cylinder 24. The extension and retraction of the cylinder 24 can complete the left and right movement of the measurement equipment;

[0061] S2: insert the speed counting unit 23 into the fixed tooth 19, and control the rotation of the motor 22 so that the corresponding gear inside the fixed tooth 19 rotates to drive the overall measuring device to rise and fall. Under the measurement of the spectrum scanner 16 and other equipment, the corresponding depth positioning is completed, and the speed counting unit 23 obtains the depth parameters of the rust pits on the metal surface;

[0062] S3: The spectrum scanner 16 completes the scanning of the corresponding position, generates a magnetic field through the magnetic field generator 3, and then through the contact between the connector 5 and the magnetic field expansion member 6, the magnetic field is extended. When the metal surface is displaced, the magnetic field is cut and the field strength is weakened. The counting frame 9 changes the position of the inner surface of the magnetic field expansion member 6 and feedback is given. Whether the surface at the corresponding position of the matrix connector 5 is a metal surface is determined to complete the area measurement. When the device is stationary, the magnetic field strength change of the magnetic field is generated by the magnetic field generator 3 to complete the corresponding measurement;

[0063] S4: The first servo motor 15 is driven to rotate to drive the measuring device to complete the measurement of different widths.

[0064] The implementation principle of the embodiment of the method and device for measuring the depth and area of ​​rust pits on metal surface of the present invention is as follows:

[0065] The displacement vehicle 26 is placed on the upper surface of the pit hole, and the lateral movement of the entire lateral measurement position equipment is completed by moving forward and backward. The reference rope 27 is lowered by the cylinder 24, and the extension and retraction of the cylinder 24 can complete the left and right movement of the measuring equipment; the rotation speed counting unit 23 is inserted into the fixed tooth 19, and the corresponding gear inside the fixed tooth 19 is rotated by controlling the rotation of the motor 22 to drive the overall measuring equipment to rise and fall. Under the measurement of the spectrum scanner 16 and other equipment, the corresponding depth positioning is completed, and the depth parameter of the rust pit on the metal surface is obtained by the rotation speed counting unit 23; the spectrum scanner 16 completes the corresponding position scanning, generates a magnetic field through the magnetic field generator 3, and then through the contact between the connector 5 and the magnetic field expansion piece 6, the magnetic field is extended. When the metal surface is displaced, the magnetic field is cut and the field strength is weakened. The inner surface position of the corresponding magnetic field expansion piece 6 of the counting frame 9 changes and feedback is generated, and the surface of the corresponding position of the matrix connector 5 is a metal surface to complete the area measurement. When the equipment is stationary, the field strength of the magnetic field is changed by the magnetic field generator 3 to complete the corresponding measurement; the measurement equipment is driven by the rotation of the first servo motor 15 to complete the measurement of different widths.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for measuring the depth and area of ​​rust pits on a metal surface, comprising a main mounting plate (1), characterized in that: The outer surface of the main body installation plate (1) is welded with an operating body shell (2); the outer surface of the main body installation plate (1) is movably connected to a magnetic field generator (3) corresponding to the operating body shell (2); the outer surface of the magnetic field generator (3) away from the operating body shell (2) is fixedly connected to a reference plate (4); the outer surface of the reference plate (4) is welded with a connector (5); the outer surface of the connector (5) is movably sleeved with a magnetic field expansion component (6); the outer surface of the reference plate (4) is fixedly connected to an outer support frame (7); the outer surface of the outer support frame (7) away from the reference plate (4) is fixedly connected to a limit plate (8); the outer surface of the limit plate (8) away from the main body installation plate (1) is fixedly connected to a counting frame (9).

2. A device for measuring the depth and area of ​​rust pits on a metal surface as claimed in claim 1, characterized in that: The outer surface of the magnetic field generator (3) is fixedly connected to a power line (10), the outer surface of one end of the power line (10) away from the magnetic field generator (3) is fixedly connected to a gyroscope (11), and the outer surface of the gyroscope (11) is fixedly connected to a magnetic field generator (12).

3. A device for measuring the depth and area of ​​rust pits on a metal surface as claimed in claim 1, characterized in that: The outer surface of the reference plate (4) is fixedly connected with a displacement tooth (13), and the outer surface of the displacement tooth (13) is movably connected with an active tooth (14).

4. A device for measuring the depth and area of ​​rust pits on a metal surface as claimed in claim 1, characterized in that: The operating body housing (2) is fixedly connected to a first servo motor (15) on the inner surface corresponding to the driving tooth (14); the outer surface of the output end of the first servo motor (15) is fixedly connected to the driving tooth (14).

5. A device for measuring the depth and area of ​​rust pits on a metal surface as claimed in claim 1, characterized in that: A spectral scanner (16) is fixedly connected to the outer surface of the main body mounting plate (1), a second servo motor (17) is fixedly connected to the outer surfaces of both sides of the main body mounting plate (1), and a roller (18) is fixedly connected to the outer surface of the output end of the second servo motor (17).

6. A device for measuring the depth and area of ​​rust pits on a metal surface as claimed in claim 1, characterized in that: A fixing tooth (19) is welded on the outer surface of the upper end of the main body mounting plate (1), a transmission tooth (20) is welded on the outer surface of the fixing tooth (19), and a mounting shell (21) is welded on the outer surface of the transmission tooth (20).

7. A device for measuring the depth and area of ​​rust pits on a metal surface as claimed in claim 6, characterized in that: A control motor (22) is arranged on the inner surface of the installation shell (21), and a rotation speed counting unit (23) is arranged on the inner surface of the installation shell (21) beside the control motor (22).

8. A device for measuring the depth and area of ​​rust pits on a metal surface as claimed in claim 6, characterized in that: The inner surface of the fixed tooth (19) is movably connected with a reference rope (27), and the outer surface of one end of the reference rope (27) away from the fixed tooth (19) is provided with a cylinder (24).

9. A device for measuring the depth and area of ​​rust pits on a metal surface as claimed in claim 8, characterized in that: A fixing block (25) is fixedly connected to the outer surface of the cylinder (24), and a displacement vehicle (26) is arranged on the outer surface of the fixing block (25).

10. A method for measuring the depth and area of ​​rust pits on a metal surface as claimed in claims 1 to 9, characterized in that: The method of using this device is as follows: S1: placing the displacement vehicle (26) on the upper surface of the pit, and completing the lateral movement of the entire lateral measurement position device by moving forward and backward, lowering the reference rope (27) through the cylinder (24), and the extension and retraction of the cylinder (24) can complete the left and right movement of the measurement device; S2: inserting the rotation speed counting unit (23) into the fixed tooth (19), and controlling the rotation of the motor (22), so that the corresponding gear inside the fixed tooth (19) rotates to drive the overall measuring device to rise and fall, and the corresponding depth positioning is completed under the measurement of the spectrum scanner (16) and other equipment, and the depth parameter of the rust pit on the metal surface is obtained by the rotation speed counting unit (23); S3: The spectral scanner (16) completes the scanning of the corresponding position, generates a magnetic field through the magnetic field generator (3), and then through the contact between the connector (5) and the magnetic field expansion member (6), the magnetic field is extended. When the metal surface is displaced, the magnetic field is cut and the field strength is weakened. The counting frame (9) changes the position of the inner surface of the magnetic field expansion member (6) and provides feedback. Whether the surface at the corresponding position of the matrix connector (5) is a metal surface is determined to complete the area measurement. When the device is stationary, the magnetic field generator (3) generates a change in the field strength of the magnetic field to complete the corresponding measurement. S4: The first servo motor (15) is driven to rotate to drive the measuring device to complete the measurement of different widths.

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