Metal material non-destructive testing device adopting soft magnetic strip and use method of metal material non-destructive testing device

Abstract

The invention discloses a metal material nondestructive testing device adopting a soft magnetic strip and a use method, and belongs to the technical field of metal material detection, the metal material nondestructive testing device comprises an excitation roller and a magnetic strip reading device, the magnetic strip reading device comprises a magnetic strip feeding mechanism, a magnetic strip pressing mechanism, a driving and transmission mechanism and a magnetic strip detection mechanism; the magnetic strip feeding mechanism comprises an inlet guide groove and an outlet guide groove, and the inlet guide groove and the outlet guide groove are formed in the equipment shell; a magnetic strip pressing wheel arm is arranged between the inlet guide groove and the outlet guide groove, is fixed on the fixed shaft I through a pressing wheel arm bearing, and swings around the fixed shaft; a pinch roller shaft is arranged at the front part of the magnetic stripe pinch roller arm, and a pinch roller is fixed on the pinch roller shaft through a pinch roller bearing and rotates around the pinch roller shaft; the device can be suitable for a measured object with an uneven surface and is suitable for a narrow space environment; and the magnetic head of the detection device is not directly contacted with the metal surface of the detected object, so that the abrasion of the magnetic head is reduced and the service life of equipment is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of metal material detection, and in particular relates to a metal material nondestructive detection device using a soft magnetic strip and a use method thereof. Background Art

[0002] In recent years, magneto-optical imaging technology has been widely used in the measurement of magnetic fields and non-destructive testing of iron-based materials. The principle is to first use a permanent magnet / excitation device to induce a magnetic field on the object to be measured, and then use magneto-optical imaging technology to image the magnetic field distribution. Since the magnetic domain distribution of the defect area inside the material is different from that of other areas, the internal defects of the material can be detected. This technology has the characteristics of non-destructive, high precision, high efficiency, and safe use, and has been widely used. For example, it is used in welding defect detection (a magnetic rotation film, magneto-optical sensor, weld detection device and method published in CN 111307723 A; a laser weld detection device based on a magneto-optical sensor published in CN108526745 A), magnetic leakage detection (a visual magnetic leakage detection device published in CN 104764798B) and damaged character detection (a magnetic field enhanced magneto-optical display device published in CN 203455290 U) and other fields.

[0003] The inventors found that the existing technical solutions require the visualization head to be attached to the surface of the object to be tested to complete the detection, and the tighter the magnetic head is attached to the object to be tested, the better the detection effect. However, because the magnetic head is made of a rigid material such as quartz glass, its surface cannot be deformed, which requires that the surface of the object to be tested is also flat. In addition, since the detection device based on the principle of magneto-optical imaging is large in size, it is difficult to apply to some objects to be tested with narrow operating space. These shortcomings seriously limit the scope of application of this technology. In addition, since the objects to be tested are all made of metal, the magnetic head is greatly worn during detection, which affects the service life of the magneto-optical detection device. Summary of the invention

[0004] In view of the above problems, the present invention provides a non-destructive testing device for metal materials using a soft magnetic strip and a method of use, which can be applicable to objects with uneven surfaces and suitable for narrow space environments; and the magnetic head of the testing device does not directly contact the metal surface of the object to be tested, thereby reducing the wear on the magnetic head and increasing the service life of the equipment.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A nondestructive testing device for metal materials using a soft magnetic strip, comprising an excitation roller and a magnetic stripe reading device, wherein the magnetic stripe reading device comprises a magnetic stripe feeding mechanism, a magnetic stripe pressing mechanism, a driving and transmission mechanism, and a magnetic stripe detecting mechanism;

[0007] The magnetic stripe feeding mechanism comprises an inlet guide groove and an outlet guide groove, and the inlet guide groove and the outlet guide groove are installed on the device housing; a magnetic stripe pressure wheel arm is arranged between the inlet guide groove and the outlet guide groove, and the magnetic stripe pressure wheel arm is fixed on the fixed shaft I through a pressure wheel arm bearing, and the magnetic stripe pressure wheel arm swings around the fixed shaft; a pressure wheel shaft is arranged at the front part of the magnetic stripe pressure wheel arm, and the pressure wheel is fixed on the pressure wheel shaft through a pressure wheel bearing, and the pressure wheel rotates around the pressure wheel shaft; a rubber wheel is arranged at the lower part of the pressure wheel, and the rubber wheel is fixed on the rubber wheel hub, and the rubber wheel hub is fixed on the rotating shaft II;

[0008] The driving and transmission mechanism includes a servo motor, the output end of the servo motor is connected to the reducer, the output end of the reducer is connected to the coupling, the output end of the coupling is connected to the rotary shaft I, the rotary shaft I and the rotary shaft II are respectively fixed to the equipment housing through a plurality of rotary shaft supports and rotary shaft bearings; the rotary shaft I and the rotary shaft II are respectively fixed to the gear I and the gear II, and the gear I and the gear II are meshed.

[0009] Furthermore, the excitation roller includes a permanent magnet ring, a magnetic ring hub, a magnetic ring roller and a handle, wherein the magnetic ring roller is arranged at one end of the handle, the permanent magnet ring is arranged on the magnetic ring roller, and the magnetic ring hubs are arranged at both ends of the permanent magnet ring.

[0010] Furthermore, a spring guide column is arranged at one end of the magnetic strip pressure wheel arm, and a pressure wheel arm spring is arranged on the spring guide column.

[0011] Furthermore, the magnetic stripe clamping mechanism is arranged at the upper end of the magnetic stripe feeding mechanism, and the magnetic stripe clamping mechanism includes a pressure block arm, the rear end of the pressure block arm is installed on the fixed shaft I through the pressure block arm bearing, and the pressure block arm swings around the fixed shaft I.

[0012] Furthermore, a pressure block is arranged at the front end of the pressure block arm, a pressure block anti-vibration pad is arranged on the pressure block, the pressure block anti-vibration pad is fixed to the pressure block by a pressure block screw, and the lower surface of the pressure block anti-vibration pad is in contact with the surface of the visualization head.

[0013] Furthermore, a roller support arm is arranged on the lower side of the pressure block arm, a cam roller shaft is arranged on the roller support arm, a roller is arranged at one end of the cam roller shaft, and the roller is fixed on the cam roller shaft through a cam roller bearing; the rear end of the pressure block arm is a pressure block arm spring, one end of the pressure block arm spring is fixed on the fixed shaft I, and the other end is pressed on the pressure block arm; the pressure block is pressed on the display head.

[0014] Furthermore, the magnetic stripe detection mechanism includes a magnetic stripe detection device and a magnetic head for displaying the magnetic stripe, and the magnetic stripe detection device and the magnetic head for displaying the magnetic stripe are used for detecting the magnetic stripe.

[0015] A method for using a nondestructive testing device for metal materials using a soft magnetic strip comprises the following steps:

[0016] First, the excitation operation is performed. During the excitation operation, the flexible magnetic strip is attached to the surface of the object to be measured. The handle is held and the permanent magnetic ring is rotated to roll the flexible magnetic strip. When the object to be measured is magnetized, the magnetic domain containing the internal defect information of the object to be measured is recorded in the magnetic strip.

[0017] Then put the magnetic stripe into the magnetic stripe feeding mechanism. When reading the magnetic stripe, first insert the magnetic stripe into the guide slot gap of the entrance guide slot to the pressure wheel position; start the feeding command, and the rubber wheel rotates under the drive of the rotating shaft II. Because the magnetic stripe pressure wheel arm ensures that a certain pressure is always maintained between the pressure wheel and the rubber wheel under the elastic force of the pressure wheel arm spring, when the magnetic stripe reaches the tangent point between the two, it is fed under the drive of the friction force of the rubber wheel, and the magnetic stripe reaches the display head. The magnetic stripe reading is completed with the cooperation of the magnetic stripe clamping mechanism, and then enters the guide slot gap of the exit guide slot and moves out at the exit of the exit guide slot, thereby completing the magnetic stripe reading operation.

[0018] Furthermore, during the reading process of the magnetic stripe, the magnetic stripe is pressed by the magnetic stripe pressing mechanism, the lower end of the pressing block arm of the magnetic stripe pressing mechanism contacts the cam through the roller, and the pressing block arm can rotate around the fixed axis I, ensuring that the pressing block and the pressing block anti-vibration pad at the front of the pressing block arm move up and down under the drive of the cam when the cam rotates;

[0019] When the cam rotates to the minimum diameter position and contacts the roller, the pressure wheel arm is in the horizontal initial position, and the pressure block and the shockproof pad can press the magnetic stripe against the display head. At this time, the magnetic stripe stops feeding, and the magnetic stripe detection device is controlled to read the magnetic stripe data. The cam continues to rotate away from the minimum diameter position, and the pressure block and the shockproof pad are pushed away from the display head by the roller. The magnetic stripe is in a pressure-free free state. At this time, the magnetic stripe is fed one step under the drive of the feeding mechanism, and the reading operation of the next step is continued.

[0020] Furthermore, the magnetic stripe pressing mechanism and the magnetic stripe feeding mechanism are powered by the driving and transmission mechanism. After the servo motor of the driving and transmission mechanism is started, the motor is decelerated by the reducer and then drives the rotating shaft I to rotate through the coupling. The rubber wheel is driven by the rotating shaft I to drive the magnetic stripe feeding mechanism to work and feed the magnetic stripe.

[0021] While the magnetic stripe is being fed, the rotating shaft I transmits power to the transmission gear II through the gear I, thereby driving the rotating shaft II to rotate, the cam of the rotating shaft rotates, and the roller pushes the pressure block arm to rise, pushing the pressure block and the shockproof pad away from the surface of the display head, and the magnetic stripe is fed; when the feed amount reaches a step distance, the servo motor stops working, and the pressure block arm reaches the minimum diameter of the cam, and the pressure block presses the display head, controlling the magnetic stripe detection device to work and read the magnetic stripe information at that position.

[0022] Compared with the prior art, the present invention has the following advantages and positive effects:

[0023] The present invention records the magnetic field of the object to be measured on a soft magnetic strip by means of magnetic recording, and then reads the magnetic strip by means of a magneto-optical detection device, and detects the internal defects of the object to be measured indirectly. After recording is completed, the detection is carried out by means of a magnetic strip feeding mechanism, a magnetic strip clamping mechanism, a driving and transmission mechanism, and a magnetic strip detection mechanism. Since the soft magnetic strip can be deformed, it is also applicable to objects to be measured with non-planar surfaces, and is applicable to objects to be measured with uneven surfaces; and since the soft magnetic strip and the excitation device are small in size, they can be applied to a small space environment; the magnetic head of the detection device does not directly contact the metal surface of the object to be measured, which reduces the wear on the magnetic head, increases the service life of the equipment, has a wider applicability, and has lower use and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 It is a structural diagram of the excitation roller of the present invention;

[0026] Figure 2 is a structural diagram of the magnetic stripe feeding mechanism of the present invention;

[0027] Figure 3 is a structural diagram of the drive and transmission mechanism of the present invention;

[0028] Figure 4 is the cam displacement curve of the present invention;

[0029] Figure 5 It is a cam profile diagram designed according to the displacement curve of the present invention;

[0030] In the figure: 0-1 flexible magnetic strip, 0-2 object to be measured, 0-3 permanent magnetic ring, 0-4 magnetic ring hub, 0-5 magnetic ring roller, 0-6 handle;

[0031] 1-2 inlet guide groove, 1-3 outlet guide groove, 1-4 magnetic strip pressure wheel arm, 1-5 pressure wheel arm bearing, 1-6 pressure wheel arm spring, 1-7 spring guide column, 1-8 pressure wheel shaft, 1-9 pressure wheel bearing, 1-10 pressure wheel, 1-11 rubber wheel hub, 1-12 rubber wheel;

[0032] 2-1 pressure block arm, 2-2 pressure block arm bearing, 2-3 pressure block arm spring, 2-4 pressure block, 2-5 pressure block anti-vibration pad, 2-6 pressure block screw, 2-7 roller support arm, 2-8 cam roller shaft, 2-9 roller, 2-10 cam;

[0033] 3-1 servo motor, 3-2 reducer, 3-3 coupling, 3-4 rotary shaft I, 3-5 rotary shaft II, 3-6 rotary shaft support, 3-7 rotary shaft bearing, 3-8 gear I, 3-9 gear II, 3-10 fixed shaft I, 3-11 fixed shaft support;

[0034] 4-1 Magnetic stripe detection device, 4-2 Visualization magnetic head. DETAILED DESCRIPTION

[0035] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0036] The existing technical solution requires that the visualization magnetic head be attached to the surface of the object to be measured to complete the detection, and the tighter the magnetic head is attached to the object to be measured, the better the detection effect. However, because the magnetic head is made of a rigid material such as quartz glass, its surface cannot be deformed, which requires that the surface of the object to be measured is also flat. In addition, since the detection device based on the principle of magneto-optical imaging is large in size, it is difficult to apply to some objects to be measured with a small operating space. These shortcomings seriously limit the scope of application of this technology. Furthermore, since the objects to be measured are all made of metal, the magnetic head is greatly worn during detection, which affects the service life of the magneto-optical detection device.

[0037] Embodiment 1:

[0038] The present invention is described in detail below in conjunction with the accompanying drawings. The present embodiment discloses a nondestructive testing device for metal materials using a soft magnetic strip. Figure 3 As shown, it includes an excitation roller and a magnetic stripe reading device, and the magnetic stripe reading device includes a magnetic stripe feeding mechanism, a magnetic stripe pressing mechanism, a driving and transmission mechanism, and a magnetic stripe detection mechanism;

[0039] The magnetic stripe feeding mechanism includes an inlet guide groove 1-2 and an outlet guide groove 1-3, and the inlet guide groove 1-2 and the outlet guide groove 1-3 are installed on the equipment housing; a magnetic stripe pressure wheel arm 1-4 is arranged between the inlet guide groove 1-2 and the outlet guide groove 1-3, and the magnetic stripe pressure wheel arm 1-4 is fixed on the fixed axis I 3-10 through a pressure wheel arm bearing 1-5, and the magnetic stripe pressure wheel arm 1-4 swings around the fixed axis; a pressure wheel shaft 1-8 is arranged at the front of the magnetic stripe pressure wheel arm 1-4, and the pressure wheel 1-10 is fixed on the pressure wheel shaft 1-8 through a pressure wheel bearing 1-9, and the pressure wheel 1-10 rotates around the pressure wheel shaft 1-8; a rubber wheel 1-12 is arranged at the lower part of the pressure wheel 1-10, and the rubber wheel 1-12 is fixed on the rubber wheel hub 1-11, and the rubber wheel hub 1-11 is fixed on the rotating axis II One end of the magnetic strip pressure wheel arm 1-4 is provided with a spring guide column 1-7, and the pressure wheel arm spring 1-6 is provided on the spring guide column 1-7.

[0040] The entrance guide groove 1-2 and the exit guide groove 1-3 are fixed to the device housing 1-1 by screws respectively. The device housing is the outer shell of the detection device, which is not shown in the figure. The guide groove gap in the middle is used to guide the magnetic strip when entering and moving out of the device. When manufacturing and installing the guide grooves, ensure that the centers of the guide groove gaps of the two are aligned.

[0041] The following points should be noted when designing the guide groove: (1) The guide groove is made of metal materials with a certain degree of wear resistance, such as aluminum alloy; (2) The thickness of the guide groove gap is about 0.5 mm larger than the thickness of the magnetic strip; the width of the guide groove gap is about 1 mm larger than the width of the magnetic strip; (3) The curvature of the curved part of the guide groove should be as small as possible while meeting the space requirements, and the inner wall of the guide groove should be as smooth as possible to reduce the friction of the magnetic strip during the feeding process and avoid jamming.

[0042] The rear end of the magnetic strip pressure wheel arm 1-4 is fixed on the fixed shaft 13-10 through the pressure wheel arm bearing 1-5, and the pressure wheel arm can swing around the fixed shaft 13-10, and cannot move axially along the fixed shaft 13-10. The front end of the pressure wheel arm is the pressure wheel shaft 1-8, and the pressure wheel 1-10 is fixed on the pressure wheel shaft 1-8 through the pressure wheel bearing 1-9, and the pressure wheel 1-10 can rotate around the pressure wheel shaft 1-8.

[0043] The surface of the pressure wheel 1-10 is designed to be a groove-shaped structure to ensure full contact with the magnetic strip during operation. It is made of hard non-metallic materials such as plastic to avoid damaging the surface of the magnetic strip and to avoid interference with the magnetic domain information carried by the magnetic strip. A spring guide column 1-7 is processed on the upper surface of the entrance guide groove 1-2; a hole is processed at the rear end of the magnetic strip pressure wheel arm 1-4; a pressure wheel arm spring 1-6 is mounted on the spring guide column 1-7, and the pressure wheel arm spring 1-6 is pressed on the rear end surface of the magnetic strip pressure wheel arm 1-4. The inner diameter of the hole at the rear end of the magnetic strip pressure wheel arm 1-4 should be larger than the outer diameter of the spring guide column 1-7, and smaller than the inner diameter of the pressure wheel arm spring 1-6, to ensure that the spring will not fall out of the hole of the pressure wheel arm when compressed. After assembly, the pressure wheel arm spring 1-6 is always in a compressed state, thereby ensuring that the rear end of the magnetic strip pressure wheel arm 1-4 is always subjected to the upward elastic force of the spring, so that a certain elastic pressure can be maintained between the front pressure wheel 1-10 and the rubber wheel 1-12 at its lower part.

[0044] The rubber wheel 1-12 is fixed on the rubber wheel hub 1-11, and there will be no relative rotation and axial movement between the two; the rubber wheel hub 1-11 is fixed on the rotating shaft II 3-5 in the axial and circumferential directions, and rotates under the drive of the rotating shaft II 3-5. The rubber wheel 1-12 is made of nitrile rubber material with high friction coefficient and high elasticity, and its diameter needs to be calculated and determined based on the magnetic strip feeding step spacing and feeding speed. In the structural design and spatial arrangement, it is ensured that the pressure wheel 1-10 is in tangential contact with the outer cylindrical surface of the rubber wheel 1-12 after assembly, and the axes of the two are parallel to each other in the vertical plane, so that the two form a pair of rollers. The diameter of the rubber wheel 1-12 is determined by the step spacing and the step speed. Each step spacing should be less than or equal to the width of the display head 4-2.

[0045] The working principle of the magnetic stripe feeding mechanism: when reading the magnetic stripe, first insert the magnetic stripe into the guide slot gap of the entrance guide slot 1-2 to the position of the pressure wheel 1-10; start the feeding command, and the rubber wheel 1-12 rotates under the drive of the rotating shaft II 3-5, because the magnetic stripe pressure wheel arm 1-4 ensures that a certain pressure is always maintained between the pressure wheel 1-10 and the rubber wheel 1-12 under the elastic force of the pressure wheel arm spring 1-6, when the magnetic stripe reaches the tangent point of the two, it is fed driven by the friction force of the rubber wheel 1-12, and the magnetic stripe reaches the display head 4-2, and the magnetic stripe reading is completed with the cooperation of the magnetic stripe clamping mechanism, and then enters the guide slot gap of the exit guide slot 1-3, and moves out at the exit of the exit guide slot 1-3, thereby completing the magnetic stripe reading operation.

[0046] like Figure 3 As shown, the driving and transmission mechanism includes a servo motor 3-1, the output end of the servo motor 3-1 is connected to the reducer 3-2, the output end of the reducer 3-2 is connected to the coupling 3-3, the output end of the coupling 3-3 is connected to the rotary shaft I 3-4, the rotary shaft I 3-4 and the rotary shaft II are respectively fixed to the equipment housing through a plurality of rotary shaft supports 3-6 and a rotary shaft bearing 3-7; the rotary shaft I 3-4 and the rotary shaft II are respectively fixed to the gear I and the gear II 3-9, and the gear I and the gear II 3-9 are meshed.

[0047] The driving and transmission mechanism provides driving force for the magnetic strip feeding mechanism and the magnetic strip pressing mechanism and ensures the coordinated work of the two.

[0048] The servo motor 3-1 and the reducer 3-2 are fixed to the equipment housing through the motor bracket. The output shaft of the reducer 3-2 is connected to the rotating shaft I 3-4 through the coupling 3-3. The rotating shaft I 3-4 and the rotating shaft II are fixed to the equipment housing through multiple rotating shaft supports 3-6 and rotating shaft bearings 3-7, and the two can rotate relative to the equipment housing; the gear I 3-9 and the gear II 3-9 are fixed to the rotating shaft I 3-4 and the rotating shaft II, respectively, and the two are meshed. The number of teeth and the transmission ratio are related to the stepping distance, speed, and cam structure, and are determined by calculation. The fixed shaft I 3-10 is fixed to the equipment housing through two fixed shaft supports 3-11, and there can be no relative rotation and axial movement.

[0049] The principle of the servo motor 3-1 driving the device to complete a reading cycle is as follows: first, after the servo motor 3-1 is started, the motor is decelerated by the reducer 3-2, and then drives the rotating shaft I 3-4 to rotate through the coupling 3-3. Driven by the rotating shaft I 3-4, the rubber wheel 1-12 drives the magnetic stripe feeding mechanism to work and feed the magnetic stripe; while the magnetic stripe is being fed, the rotating shaft I 3-4 transmits power to the transmission gear II 3-9 through the gear I 3-8, thereby driving the rotating shaft II 3-5 rotates, the cam of the rotary shaft rotates, the roller 2-9 pushes the pressure block arm 2-1 up, pushes the pressure block 2-4 and the pressure block anti-vibration pad 2-5 away from the surface of the display head 4-2, and the magnetic stripe is fed; when the feeding amount reaches a step distance, the servo motor 3-1 stops working, at this time the pressure block arm 2-1 reaches the minimum diameter of the cam 2-10, the pressure block 2-4 presses the display head 4-2, controls the magnetic stripe detection device 4-1 to work, and reads the magnetic stripe information at this position; after reading the magnetic stripe information of a step distance, the servo motor 3-1 is started to work and enter the next working cycle. Until all the information of the magnetic stripe is read in length.

[0050] like Figure 1 As shown, the excitation roller includes a permanent magnet ring 0-3, a magnetic ring hub 0-4, a magnetic ring roller 0-5 and a handle 0-6, the magnetic ring roller 0-5 is arranged at one end of the handle 0-6, the permanent magnet ring 0-3 is arranged on the magnetic ring roller 0-5, and the magnetic ring hub 0-4 is arranged at both ends of the permanent magnet ring 0-3.

[0051] The width of the permanent magnetic ring 0-3 should be equal to or slightly larger than the width of the flexible magnetic strip 0-1. The magnetic ring is made into S and N poles in the annular direction, and the magnetic field direction should be perpendicular to the axis of the permanent magnetic ring 0-3. The magnetized permanent magnetic ring 0-3 is fixed on the magnetic ring hub 0-4, and the magnetic ring hub 0-4 can rotate relative to the magnetic ring roller 0-5, and the magnetic ring roller 0-5 is fixed on the handle 0-6. In order to reduce the ferromagnetic resistance during the rotation of the magnetic ring, the magnetic ring hub 0-4, the magnetic ring roller 0-5, the handle 0-6 and other components should be made of aluminum alloy or non-ferromagnetic materials such as plastic and rubber.

[0052] During the excitation operation, the flexible magnetic strip 0-1 is attached to the surface of the object 0-2 to be measured, and the handle 0-6 is held to rotate the permanent magnetic ring 0-3 to roll the flexible magnetic strip 0-1. While the object 0-2 to be measured is magnetized, the magnetic domain containing the internal defect information of the object 0-2 to be measured is recorded in the magnetic strip. After the flexible magnetic strip 0-1 is excited, the magnetic strip information is read by the magnetic strip reading device.

[0053] like Figure 3 As shown, the magnetic stripe clamping mechanism is arranged at the upper end of the magnetic stripe feeding mechanism, and the magnetic stripe clamping mechanism includes a clamp arm 2-1, and the rear end of the clamp arm 2-1 is mounted on the fixed shaft I3-10 through a clamp arm bearing 2-2, and the clamp arm 2-1 swings around the fixed shaft I3-10. A clamp 2-4 is arranged at the front end of the clamp arm 2-1, and a clamp anti-vibration pad 2-5 is arranged on the clamp 2-4, and the clamp anti-vibration pad 2-5 is fixed on the clamp 2-4 through a clamp screw 2-6, and the lower surface of the clamp anti-vibration pad 2-5 is in contact with the surface of the visualization head 4-2. A roller support arm 2-7 is arranged on the lower side of the pressure block arm 2-1, a cam roller shaft 2-8 is arranged on the roller support arm 2-7, a roller 2-9 is arranged on one end of the cam roller shaft 2-8, and the roller 2-9 is fixed on the cam roller shaft 2-8 through the cam roller shaft 2-8 bearing; the rear end of the pressure block arm 2-1 is a pressure block arm spring 2-3, one end of the pressure block arm spring 2-3 is fixed on the fixed shaft I 3-10, and the other end is pressed on the pressure block arm 2-1; the pressure block 2-4 is pressed on the display head 4-2.

[0054] The function of the magnetic stripe pressing mechanism is to press the step-fed magnetic stripe onto the display head 4-2 in a time-sharing manner to ensure that the magnetic stripe is in full contact with the sensor surface and realize the reading of the magnetic stripe information.

[0055] The rear end of the pressure block arm 2-1 is mounted on the fixed axis I 3-10 through the pressure block arm bearing 2-2, and can swing around the fixed axis, but cannot move axially along the fixed axis I 3-10. The front end of the pressure block arm 2-1 is the pressure block 2-4. The design requirements of the pressure block 2-4 are: (1) using soft materials to avoid pressure damage to the sensor; (2) not affecting the magnetic domain distribution of the magnetic strip. Therefore, it can be made of non-metallic materials with higher density, such as silicone rubber.

[0056] The pressure block anti-vibration pad 2-5 is fixed on the pressure block 2-4 by means of pressure block screws 2-6 or glue bonding. Because the pressure block anti-vibration pad 2-5 is in direct contact with the magnetic strip and the display head 4-2, it is required to be soft and elastic. When designing the structure, it should be ensured that when the pressure wheel arm is in the horizontal initial state, the lower surface of the pressure block anti-vibration pad 2-5 should overlap with the surface of the display head 4-2.

[0057] A roller support arm 2-7 is arranged at the lower side of the pressure block arm 2-1, on which a cam roller shaft 2-8 is designed, and a roller 2-9 is fixed on the cam roller shaft 2-8 through a cam roller bearing, and the roller 2-9 can rotate around the cam roller shaft 2-8; the cam 2-10 is fixed on the rotating shaft II 3-5, and is fixed in both the axial and circumferential directions, and can rotate simultaneously with the rotating shaft II 3-5. The rear end of the pressure block arm 2-1 is a pressure block arm spring 2-3, one end of which is fixed on the fixed shaft I 3-10, and the other end is pressed on the pressure block arm 2-1. When the pressure block 2-4 is pressed on the display head 4-2, it should be ensured that the spring has a certain pressure on the pressure wheel arm.

[0058] Cam 2-10 is an important component in the present invention, and its contour design can be adopted as follows: according to the working principle of magnetic stripe feeding, after a step feeding is completed, the pressure block 2-4 falls to the lowest position, pressing the magnetic stripe on the display head 4-2, and the driving motor stops running at this time. During the time of each reading cycle magnetic stripe feeding, the pressure block 2-4 should not have pressure on the magnetic stripe, otherwise the magnetic stripe will be pressed between the pressure block 2-4 and the sensor, which will not only make the magnetic stripe unable to feed, but also easily cause wear to the display head 4-2. Therefore, in order to push the pressure block 2-4 away from the sensor as soon as possible when the magnetic stripe is fed, the far rest section and the near rest section are cancelled when designing the cam contour, and only the push section and the return section are retained. In order to ensure that the pressure block 2-4 has enough pressure on the magnetic stripe, the return time is designed to be shorter than the push time. Therefore, the push angle range can be designed to be Φ=150°; the return angle range is Φ′ =30°. In addition, in order to increase the feeding speed and improve the reading efficiency, the cam can be designed into two working cycles. Assuming that the maximum push distance of the cam (the maximum lifting height of the pressure block 2-4) is h, is the thrust angle, the displacement curve S of the cam can be calculated using the following formula:

[0059]

[0060] Figure 4 The cam displacement curve invented by this method is Figure 4 The vertical axis is the cam displacement S, and the horizontal axis is the thrust angle φ ;

[0061] Working principle of magnetic stripe clamping mechanism: the lower end of the clamp arm 2-1 contacts the cam 2-10 through the roller 2-9, and the clamp arm 2-1 can rotate around the fixed axis I 3-10, so that the clamp 2-4 and the clamp shockproof pad 2-5 at the front of the clamp arm 2-1 move up and down under the drive of the cam 2-10 when the cam rotates. When the cam rotates to the minimum diameter position and contacts the cam, the pressure wheel arm is in the horizontal initial position, and the clamp 2-4 and the shockproof pad can press the magnetic stripe on the display head 4-2. At this time, the magnetic stripe stops feeding, and the magnetic stripe detection device 4-1 is controlled to read the magnetic stripe data. The cam 2-10 continues to rotate away from the minimum diameter position, and the clamp 2-4 and the shockproof pad are separated from the display head 4-2 under the push of the roller 2-9, and the magnetic stripe is in a pressure-free free state. At this time, the magnetic stripe is fed one step under the drive of the feeding mechanism, and the reading operation of the next step is continued.

[0062] Because the spring 2-3 of the pressing arm always has a certain elastic pressure on the pressing wheel arm, the vibration of the pressing arm 2-1 in the up and down swinging can be reduced. In the whole working stroke, the roller 2-9 is always in contact with the surface of the cam 2-10, which ensures that the pressing arm 2-1 works stably and reliably.

[0063] like Figure 2 As shown, the magnetic stripe detection mechanism includes a magnetic stripe detection device 4-1 and a visualization head 4-2, and the magnetic stripe detection device 4-1 and the visualization head 4-2 are used to detect the magnetic stripe. The magnetic stripe detection device 4-1 is used to detect and visualize the magnetic stripe information. Figure 2 In the figure, there are a magnetic stripe detection device 4-1 and a display head 4-2, and only the appearance diagrams of the two are given.

[0064] The magnetic stripe detection device 4-1 adopts magneto-optical display technology. Its structure and principle are similar to the existing magneto-optical detection technology, such as for welding defect detection: a magnetic optical rotation film, a magneto-optical sensor, a weld detection device and method (CN 111307723A), a laser weld detection device based on a magneto-optical sensor (CN 108526745A); for magnetic flux leakage detection: a visual magnetic flux leakage detection device (CN 104764798B); for damaged character detection: a magnetic field enhanced magneto-optical display device (CN203455290 U). Therefore, the structure is not described in detail in this patent. The display head 4-2 is the sensor of the magnetic stripe detection device 4-1. The above-mentioned reference patents have described its principle and structure in detail, but this patent does not describe it in detail.

[0065] When installing and positioning the magnetic stripe detection device 4-1, it is necessary to ensure that the upper surface of the visible magnetic head 4-2 is parallel to the lower surface of the guide groove gap between the entrance guide groove 1-2 and the exit guide groove 1-3, and the gap between the sensor and the entrance guide groove and the exit guide groove in the magnetic stripe feeding direction is as small as possible, so as to avoid jamming at these positions when the magnetic stripe is fed.

[0066] Embodiment 2:

[0067] A method for using a nondestructive testing device for metal materials using a soft magnetic strip comprises the following steps:

[0068] First, the excitation operation is performed. During the excitation operation, the flexible magnetic strip 0-1 is attached to the surface of the object to be measured 0-2, and the handle 0-6 is held to rotate the permanent magnetic ring 0-3 to roll the flexible magnetic strip 0-1. When the object to be measured 0-2 is magnetized, the magnetic domain containing the internal defect information of the object to be measured 0-2 is recorded in the magnetic strip;

[0069] Then put the magnetic stripe into the magnetic stripe feeding mechanism. When reading the magnetic stripe, first insert the magnetic stripe into the guide slot gap of the entrance guide slot 1-2 to the pressure wheel position; start the feeding command, and the rubber wheel 1-12 rotates under the drive of the rotating shaft II 3-5. Because the magnetic stripe pressure wheel arm 1-4 ensures that a certain pressure is always maintained between the pressure wheel 1-10 and the rubber wheel 1-12 under the elastic force of the pressure wheel arm spring 1-6, when the magnetic stripe reaches the tangent point between the two, it is fed driven by the friction force of the rubber wheel 1-12, and the magnetic stripe reaches the display head 4-2. With the cooperation of the magnetic stripe clamping mechanism, the magnetic stripe is read, and then enters the guide slot gap of the exit guide slot 1-3, and moves out at the exit of the exit guide slot 1-3, thereby completing the magnetic stripe reading operation.

[0070] During the reading process of the magnetic stripe, the magnetic stripe is pressed by the magnetic stripe pressing mechanism, and the lower end of the pressing block arm 2-1 of the magnetic stripe pressing mechanism contacts the cam 2-10 through the roller 2-9, and the pressing block arm 2-1 can rotate around the fixed axis I 3-10, ensuring that the pressing block 2-4 and the pressing block anti-vibration pad 2-5 at the front of the pressing block arm 2-1 move up and down under the drive of the cam when the cam 2-10 rotates;

[0071] When the cam 2-10 rotates to the minimum diameter position and contacts the roller 2-9, the pressure wheel arm is in the horizontal initial position, and the pressure block 2-4 and the shockproof pad can press the magnetic stripe against the display head 4-2. At this time, the magnetic stripe stops feeding, and the magnetic stripe detection device 4-1 is controlled to read the magnetic stripe data. The cam 2-10 continues to rotate away from the minimum diameter position, and the pressure block 2-4 and the shockproof pad are separated from the display head 4-2 under the push of the roller 2-9. The magnetic stripe is in a pressure-free free state. At this time, the magnetic stripe is fed one step under the drive of the feeding mechanism, and the reading operation of the next step is continued.

[0072] The magnetic stripe pressing mechanism and the magnetic stripe feeding mechanism are powered by the driving and transmission mechanism. After the servo motor 3-1 of the driving and transmission mechanism is started, the motor is decelerated by the reducer 3-2, and then drives the rotating shaft I 3-4 to rotate through the coupling 3-3. The rubber wheel 1-12 is driven by the rotating shaft I 3-4 to drive the magnetic stripe feeding mechanism to work and feed the magnetic stripe;

[0073] While the magnetic stripe is being fed, the rotating shaft I 3-4 transmits power to the transmission gear II 3-9 through the gear I 3-8, thereby driving the rotating shaft II 3-5 to rotate, and the cam 2-10 of the rotating shaft rotates, and the roller 2-9 pushes the pressure block arm 2-1 to rise, pushing the pressure block 2-4 and the shock-absorbing pad away from the surface of the display head 4-2, and the magnetic stripe is fed; when the feeding amount reaches a step distance, the servo motor 3-1 stops working, and the pressure block arm 2-1 reaches the minimum diameter of the cam 2-10, and the pressure block 2-4 presses the display head 4-2, controls the magnetic stripe detection device 4-1 to work, and reads the magnetic stripe information at this position.

[0074] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A nondestructive testing device for metal materials using a soft magnetic strip, characterized in that: It includes an excitation roller and a magnetic stripe reading device, wherein the magnetic stripe reading device includes a magnetic stripe feeding mechanism, a magnetic stripe pressing mechanism, a driving and transmission mechanism, and a magnetic stripe detecting mechanism; The magnetic stripe feeding mechanism comprises an inlet guide groove and an outlet guide groove, and the inlet guide groove and the outlet guide groove are installed on the device housing; a magnetic stripe pressure wheel arm is arranged between the inlet guide groove and the outlet guide groove, and the magnetic stripe pressure wheel arm is fixed on the fixed shaft I through a pressure wheel arm bearing, and the magnetic stripe pressure wheel arm swings around the fixed shaft; a pressure wheel shaft is arranged at the front part of the magnetic stripe pressure wheel arm, and the pressure wheel is fixed on the pressure wheel shaft through a pressure wheel bearing, and the pressure wheel rotates around the pressure wheel shaft; a rubber wheel is arranged at the lower part of the pressure wheel, and the rubber wheel is fixed on the rubber wheel hub, and the rubber wheel hub is fixed on the rotating shaft II; The driving and transmission mechanism includes a servo motor, the output end of the servo motor is connected to the reducer, the output end of the reducer is connected to the coupling, the output end of the coupling is connected to the rotary shaft I, the rotary shaft I and the rotary shaft II are respectively fixed to the equipment housing through a plurality of rotary shaft supports and rotary shaft bearings; the rotary shaft I and the rotary shaft II are respectively fixed to the gear I and the gear II, and the gear I and the gear II are meshed.

2. A nondestructive testing device for metal materials using a soft magnetic strip as claimed in claim 1, characterized in that: The excitation roller comprises a permanent magnet ring, a magnet ring hub, a magnet ring roller and a handle, wherein the magnet ring roller is arranged at one end of the handle, the permanent magnet ring is arranged on the magnet ring roller, and the magnet ring hubs are arranged at both ends of the permanent magnet ring.

3. A nondestructive testing device for metal materials using a soft magnetic strip as claimed in claim 1, characterized in that: A spring guide column is arranged at one end of the magnetic strip pressure wheel arm, and a pressure wheel arm spring is arranged on the spring guide column.

4. A nondestructive testing device for metal materials using a soft magnetic strip as claimed in claim 1, characterized in that: The magnetic stripe clamping mechanism is arranged at the upper end of the magnetic stripe feeding mechanism, and the magnetic stripe clamping mechanism includes a pressure block arm, the rear end of the pressure block arm is installed on the fixed shaft I through the pressure block arm bearing, and the pressure block arm swings around the fixed shaft I.

5. A nondestructive testing device for metal materials using a soft magnetic strip as claimed in claim 4, characterized in that: A pressure block is arranged at the front end of the pressure block arm, a pressure block anti-vibration pad is arranged on the pressure block, the pressure block anti-vibration pad is fixed on the pressure block by a pressure block screw, and the lower surface of the pressure block anti-vibration pad is in contact with the surface of the visualization head.

6. A nondestructive testing device for metal materials using a soft magnetic strip as claimed in claim 5, characterized in that: A roller support arm is arranged at the lower side of the pressure block arm, a cam roller shaft is arranged on the roller support arm, a roller is arranged at one end of the cam roller shaft, and the roller is fixed on the cam roller shaft through a cam roller bearing; the rear end of the pressure block arm is a pressure block arm spring, one end of the pressure block arm spring is fixed on the fixed shaft I, and the other end is pressed on the pressure block arm; the pressure block is pressed on the display head.

7. A nondestructive testing device for metal materials using a soft magnetic strip as claimed in claim 1, characterized in that: The magnetic stripe detection mechanism comprises a magnetic stripe detection device and a magnetic head for displaying the magnetic stripe, and the magnetic stripe detection device and the magnetic head for displaying the magnetic stripe are used for detecting the magnetic stripe.

8. A method for using a nondestructive testing device for metal materials using a soft magnetic strip as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: First, the excitation operation is performed. During the excitation operation, the flexible magnetic strip is attached to the surface of the object to be measured. The handle is held and the permanent magnetic ring is rotated to roll the flexible magnetic strip. When the object to be measured is magnetized, the magnetic domain containing the internal defect information of the object to be measured is recorded in the magnetic strip. Then put the magnetic stripe into the magnetic stripe feeding mechanism. When reading the magnetic stripe, first insert the magnetic stripe into the guide slot gap of the entrance guide slot to the pressure wheel position; start the feeding command, and the rubber wheel rotates under the drive of the rotating shaft II. Because the magnetic stripe pressure wheel arm ensures that a certain pressure is always maintained between the pressure wheel and the rubber wheel under the elastic force of the pressure wheel arm spring, when the magnetic stripe reaches the tangent point between the two, it is fed under the drive of the friction force of the rubber wheel, and the magnetic stripe reaches the display head. The magnetic stripe reading is completed with the cooperation of the magnetic stripe clamping mechanism, and then enters the guide slot gap of the exit guide slot and moves out at the exit of the exit guide slot, thereby completing the magnetic stripe reading operation.

9. The method of use according to claim 8, characterized in that: During the reading process of the magnetic stripe, the magnetic stripe is pressed by the magnetic stripe pressing mechanism, and the lower end of the pressing block arm of the magnetic stripe pressing mechanism contacts the cam through a roller, and the pressing block arm can rotate around the fixed axis I, ensuring that the pressing block and the pressing block shockproof pad at the front of the pressing block arm move up and down under the drive of the cam when the cam rotates; When the cam rotates to the minimum diameter position and contacts the roller, the pressure wheel arm is in the horizontal initial position, and the pressure block and the shock-proof pad can press the magnetic stripe against the display head. At this time, the magnetic stripe stops feeding, and the magnetic stripe detection device is controlled to read the magnetic stripe data; the cam continues to rotate away from the minimum diameter position, and the pressure block and the shock-proof pad are separated from the display head under the push of the roller, and the magnetic stripe is in a pressure-free free state. At this time, the magnetic stripe is fed one step under the drive of the feeding mechanism, and the reading operation of the next step is continued.

10. The method of use according to claim 8, characterized in that: The magnetic stripe pressing mechanism and the magnetic stripe feeding mechanism are powered by the driving and transmission mechanism. After the servo motor of the driving and transmission mechanism is started, the motor is decelerated by the reducer and then drives the rotating shaft I to rotate through the coupling. The rubber wheel is driven by the rotating shaft I to drive the magnetic stripe feeding mechanism to work and feed the magnetic stripe. While the magnetic stripe is being fed, the rotating shaft I transmits power to the transmission gear II through the gear I, thereby driving the rotating shaft II to rotate, the cam of the rotating shaft rotates, and the roller pushes the pressure block arm to rise, pushing the pressure block and the shockproof pad away from the surface of the display head, and the magnetic stripe is fed; when the feed amount reaches a step distance, the servo motor stops working, and the pressure block arm reaches the minimum diameter of the cam, and the pressure block presses the display head, controlling the magnetic stripe detection device to work and read the magnetic stripe information at that position.

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