A nondestructive testing device for metal materials using a soft magnetic strip and a method of use

Abstract

The invention discloses a nondestructive testing device for metal materials using a soft magnetic strip and a method for using the device, which belongs to the technical field of metal material testing. The device comprises 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 testing mechanism; the magnetic stripe feeding mechanism comprises an inlet guide groove and an outlet guide groove, which are mounted on a device housing; a magnetic stripe pressure wheel arm is provided between the inlet guide groove and the outlet guide groove, the magnetic stripe pressure wheel arm is fixed to a 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 provided at the front of the magnetic stripe pressure wheel arm, the pressure wheel is fixed to the pressure wheel shaft through a pressure wheel bearing, and the pressure wheel rotates around the pressure wheel shaft; the device is applicable to objects to be tested with uneven surfaces and to 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 wear on the magnetic head and increasing the service life of the device.

Description

Technical Field

[0001] The present 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 method for using the device. Background Art

[0002] In recent years, magneto-optical imaging technology has been widely used for magnetic field measurement and non-destructive testing of iron-based materials. Its principle is to first use a permanent magnet / excitation device to induce a magnetic field on the object being measured, and then use magneto-optical imaging technology to image the magnetic field distribution. Because the magnetic domain distribution in defective areas of the material is different from that in other areas, internal defects in the material can be detected. This technology is non-destructive, highly accurate, efficient, and safe to use, and is currently widely used. For example, it is used in welding defect detection (CN 111307723 A discloses a magneto-optical diaphragm, magneto-optical sensor, weld detection device and method; CN 108526745 A discloses a laser weld detection device based on a magneto-optical sensor), magnetic flux leakage detection (CN 104764798B discloses a visual magnetic flux leakage detection device), and damaged character detection (CN 203455290 U discloses a magnetic field-enhanced magneto-optical visualization device).

[0003] The inventors discovered that existing technical solutions require the visualization head to 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 using 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. Summary of the Invention

[0004] In response to the above problems, the present invention provides a non-destructive testing device for metal materials using a soft magnetic strip and a method for use, which can be applied to objects with uneven surfaces and suitable for confined space environments; and the magnetic head of the testing device does not directly contact the metal surface of the object being tested, reducing 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 comprises 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 includes 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 provided between the inlet guide groove and the outlet guide groove, and the magnetic stripe pressure wheel arm is fixed on the fixed axis I through a pressure wheel arm bearing, and the magnetic stripe pressure wheel arm swings around the fixed axis; a pressure wheel shaft is provided at the front 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 provided 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 axis 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, and the rotary shaft I and rotary shaft II are respectively fixed to the equipment housing through multiple rotary shaft supports and rotary shaft bearings; the rotary shaft I and rotary shaft II are respectively fixed to the gear I and gear II, and the gear I and 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, the magnetic ring roller is provided at one end of the handle, the permanent magnet ring is provided on the magnetic ring roller, and the magnetic ring hubs are provided at both ends of the permanent magnet ring.

[0010] Furthermore, a spring guide column is provided at one end of the magnetic strip pressure wheel arm, and a pressure wheel arm spring is provided 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 provided at the front end of the pressure block arm, a pressure block shockproof pad is provided on the pressure block, the pressure block shockproof pad is fixed to the pressure block by a pressure block screw, and the lower surface of the pressure block shockproof pad is in contact with the surface of the visualization head.

[0013] Furthermore, a roller support arm is provided on the lower side of the pressure block arm, a cam roller shaft is provided on the roller support arm, a roller is provided 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 display magnetic head, and the magnetic stripe detection device and the display magnetic head are used to detect 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, perform the excitation operation. 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 magnet ring is rotated to roll the flexible magnetic strip. While 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 rotary 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 friction of the rubber wheel, and the magnetic stripe reaches the display head. 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 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 compressed by the magnetic stripe compression mechanism. The lower end of the compression arm of the magnetic stripe compression mechanism contacts the cam via a roller, and the compression arm can rotate around the fixed axis I, ensuring that the compression block and the compression block shock pad at the front of the compression 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 roller arm is in the horizontal initial position. The pressure block and shock 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. The pressure block and shock pad are pushed away from the display head by the roller. The magnetic stripe is in a pressure-free and free state. At this time, the magnetic stripe is fed one step under the drive of the feeding mechanism, and the reading operation continues for the next step.

[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 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 rotary shaft I transmits power to the transmission gear II through the gear I, thereby driving the rotary shaft II to rotate. The cam of the rotary shaft rotates, and the roller pushes the pressure block arm to rise, pushing the pressure block and the shock-absorbing 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. At this time, the pressure block arm reaches the minimum diameter of the cam, and the pressure block presses the display head, controlling the operation of the magnetic stripe detection device to 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 a magnetic recording method, and then reads the magnetic strip through a magneto-optical detection device, and detects internal defects of the object to be measured in an indirect manner. After the recording is completed, the detection is carried out by the cooperation of a magnetic strip feeding mechanism, a magnetic strip pressing 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. It is suitable for objects to be measured with uneven surfaces. Moreover, since the soft magnetic strip and the excitation device are small in size, they can be used in 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 wear on the magnetic head and increases the service life of the device. It has wider applicability and lower use and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, 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 This is a structural diagram of the excitation roller of the present invention;

[0026] Figure 2 It 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 the cam profile 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 roller arm, 1-5 pressure roller arm bearing, 1-6 pressure roller arm spring, 1-7 spring guide column, 1-8 pressure roller shaft, 1-9 pressure roller bearing, 1-10 pressure roller, 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] Existing technical solutions require attaching a visualization magnetic head to the surface of the object to be measured to complete the detection. 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, due to the large size of the detection device based on the principle of magneto-optical imaging, 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, because 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] Example 1:

[0038] The present invention will be described in detail below with reference to the accompanying drawings. This 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 roller arm 1-4 is set between the inlet guide groove 1-2 and the outlet guide groove 1-3, and the magnetic stripe pressure roller arm 1-4 is fixed on the fixed axis I 3-10 through the pressure roller arm bearing 1-5, and the magnetic stripe pressure roller arm 1-4 swings around the fixed axis; a pressure roller shaft 1-8 is set at the front of the magnetic stripe pressure roller arm 1-4, and the pressure roller 1-10 is fixed on the pressure roller shaft 1-8 through the pressure roller bearing 1-9, and the pressure roller 1-10 rotates around the pressure roller shaft 1-8; a rubber wheel 1-12 is set at the lower part of the pressure roller 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 entry guide slot 1-2 and exit guide slot 1-3 are each secured to the device housing 1-1 with screws. The device housing is the outer shell of the detection device and is not shown in the figure. The gap between the guide slots guides the magnetic strip as it enters and exits the device. The guide slots must be manufactured and installed to ensure that their centers are aligned.

[0041] The following points should be noted when designing the guide groove: (1) The guide groove is made of metal materials with certain wear resistance, such as aluminum alloy; (2) The thickness of the guide groove gap is about 0.5mm larger than the thickness of the magnetic strip; the width of the guide groove gap is about 1mm 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 stripe pressure roller arm 1-4 is fixed to the fixed shaft 13-10 through the pressure roller arm bearing 1-5. The pressure roller arm can swing around the fixed shaft 13-10 but cannot move axially along the fixed shaft 13-10. The front end of the pressure roller arm is the pressure roller shaft 1-8. The pressure roller 1-10 is fixed to the pressure roller shaft 1-8 through the pressure roller bearing 1-9. The pressure roller 1-10 can rotate around the pressure roller shaft 1-8.

[0043] The surface of the pressure roller 1-10 is designed with a grooved structure to ensure full contact with the magnetic strip during operation. It is constructed from hard non-metallic materials such as plastic to prevent damage to the magnetic stripe surface and interference with the magnetic domain information carried by the stripe. A spring guide post 1-7 is machined on the upper surface of the entrance guide groove 1-2; a hole is machined at the rear end of the magnetic stripe pressure roller arm 1-4. A pressure roller arm spring 1-6 is mounted on the spring guide post 1-7, pressing against the rear end surface of the magnetic stripe pressure roller arm 1-4. The inner diameter of the hole at the rear end of the magnetic stripe pressure roller arm 1-4 should be larger than the outer diameter of the spring guide post 1-7 but smaller than the inner diameter of the pressure roller arm spring 1-6 to ensure that the spring does not escape from the pressure roller arm hole when compressed. After assembly, the pressure roller arm spring 1-6 is always compressed, ensuring that the rear end of the magnetic stripe pressure roller arm 1-4 is constantly subject to the upward force of the spring, maintaining a constant elastic pressure between the front pressure roller 1-10 and the rubber wheel 1-12 below it.

[0044] The rubber wheel 1-12 is fixed to the rubber wheel hub 1-11, preventing relative rotation and axial movement between the two. The rubber wheel hub 1-11 is axially and circumferentially fixed to the rotating shaft II 3-5 and rotates driven by the rotating shaft II 3-5. The rubber wheel 1-12 is made of a high-friction and high-elasticity nitrile rubber material. Its diameter is calculated and determined based on the magnetic strip feed step spacing and feed speed. During the structural design and spatial arrangement, it is ensured that after assembly, the pressure wheel 1-10 is in tangential contact with the outer surface of the rubber wheel 1-12, and the axes of the two are parallel in the vertical plane, forming a pair of rollers. The diameter of the rubber wheel 1-12 is determined by the step spacing and 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 instruction, 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 under 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 drive 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 shafts I to 3-4, the rotary shafts I to 3-4 and the rotary shafts II are respectively fixed to the equipment housing through multiple rotary shaft supports 3-6 and rotary shaft bearings 3-7; the rotary shafts I to 3-4 and the rotary shafts II are respectively fixed to the gears I and II 3-9, and the gears I and II 3-9 are engaged.

[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 operation of the two.

[0048] Servo motor 3-1 and reducer 3-2 are fixed to the device housing via a motor bracket. The output shaft of reducer 3-2 is connected to rotary shaft I 3-4 via coupling 3-3. Rotary shaft I 3-4 and rotary shaft II are respectively fixed to the device housing via multiple rotary shaft supports 3-6 and rotary shaft bearings 3-7, allowing them to rotate relative to the device housing. Gear I 3-9 and gear II 3-9 are respectively fixed to rotary shaft I 3-4 and rotary shaft II, meshing with each other. Their number of teeth and transmission ratio are related to the stepping distance, speed, and cam structure and are determined through calculation. Fixed shaft I 3-10 is fixed to the device housing via two fixed shaft supports 3-11, preventing 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 rotary shaft I 3-4 to rotate through the coupling 3-3. Driven by the rotary shaft I 3-4, the rubber wheel 1-12 drives the magnetic stripe feeding mechanism to work, and the magnetic stripe is fed; while the magnetic stripe is being fed, the rotary shaft I 3-4 transmits power to the transmission gear II 3-9 through the gear I 3-8, thereby driving the rotary shaft II 3-5 rotates, the cam of the rotary shaft rotates, and the roller 2-9 pushes the pressure block arm 2-1 upward, pushing the pressure block 2-4 and the pressure block shock pad 2-5 away from the surface of the display head 4-2, and the magnetic stripe is fed. When the feeding amount reaches one step, the servo motor 3-1 stops working, and 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, controlling the magnetic stripe detection device 4-1 to operate and read the magnetic stripe information at that position. After reading the magnetic stripe information of one step, the servo motor 3-1 is started to work, and the next working cycle begins. This continues until all the information of the magnetic stripe is read along the 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 set at one end of the handle 0-6, the permanent magnet ring 0-3 is set on the magnetic ring roller 0-5, and the magnetic ring hub 0-4 is set at both ends of the permanent magnet ring 0-3.

[0051] The width of the permanent magnet ring 0-3 should be equal to or slightly larger than that of the flexible magnetic strip 0-1. The ring's annular orientation should be characterized by north and south poles, and the magnetic field should be perpendicular to the axis of the permanent magnet ring 0-3. After magnetization, the permanent magnet ring 0-3 is affixed to the magnetic hub 0-4. The magnetic hub 0-4 can rotate relative to the magnetic roller 0-5, which is affixed to the handle 0-6. To minimize ferromagnetic resistance during rotation, the magnetic hub 0-4, magnetic roller 0-5, and handle 0-6 should be constructed from aluminum alloy or non-ferromagnetic materials such as plastic or rubber.

[0052] During the excitation operation, flexible magnetic stripe 0-1 is attached to the surface of the object to be measured 0-2. Handle 0-6 is used to rotate permanent magnet ring 0-3 and roll the flexible magnetic stripe 0-1. As the object to be measured 0-2 is magnetized, magnetic domains containing information about internal defects in the object 0-2 are recorded on the magnetic stripe. After the flexible magnetic stripe 0-1 is excited, the magnetic stripe information is read using a magnetic stripe reader.

[0053] like Figure 3 As shown, the magnetic stripe clamping mechanism is located at the upper end of the magnetic stripe feeding mechanism. The magnetic stripe clamping mechanism includes a pressure block arm 2-1. The rear end of the pressure block arm 2-1 is mounted on a fixed shaft 13-10 via a pressure block arm bearing 2-2, and the pressure block arm 2-1 swings around the fixed shaft 13-10. A pressure block 2-4 is located at the front end of the pressure block arm 2-1. A pressure block anti-vibration pad 2-5 is provided on the pressure block 2-4. The pressure block anti-vibration pad 2-5 is fixed to the pressure block 2-4 via a pressure block screw 2-6. The lower surface of the pressure block anti-vibration pad 2-5 is in contact with the surface of the visualization head 4-2. A roller support arm 2-7 is set on the lower side of the pressure block arm 2-1, and a cam roller shaft 2-8 is set on the roller support arm 2-7. A roller 2-9 is set at one end of the cam roller shaft 2-8, and the roller 2-9 is fixed to the cam roller shaft 2-8 through the cam roller shaft 2-8 support; the rear end of the pressure block arm 2-1 is the 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 to realize the reading of the magnetic stripe information.

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

[0056] The pressure block anti-vibration pad 2-5 is fixed to the pressure block 2-4 by means of pressure block screws 2-6 or glue. Because the pressure block anti-vibration pad 2-5 directly contacts the magnetic stripe and the display head 4-2, it must be soft and elastic. During structural design, the lower surface of the pressure block anti-vibration pad 2-5 should coincide with the surface of the display head 4-2 when the pressure roller arm is initially horizontal.

[0057] A roller support arm 2-7 is located beneath the pressure arm 2-1, on which a cam roller shaft 2-8 is mounted. Roller 2-9 is secured to the cam roller shaft 2-8 via a cam roller bearing, allowing it to rotate about the shaft. Cam 2-10 is secured to rotary shaft II 3-5, both axially and circumferentially, and capable of rotating simultaneously with the shaft. At the rear end of the pressure arm 2-1 is a pressure arm spring 2-3, one end of which is secured to fixed shaft I 3-10 and the other end of which presses against the pressure arm 2-1. This ensures that the spring exerts a certain amount of pressure on the pressure roller arm when the pressure arm 2-4 presses against the visualization head 4-2.

[0058] Cam 2-10 is an important component in the present invention, and its contour design can be designed as follows: according to the working principle of magnetic stripe feeding, at the same time as 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 drive motor stops running at this time. During the time of each reading cycle of 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 quickly 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 feed 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, and 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] The magnetic stripe clamping mechanism operates as follows: The lower end of the clamp arm 2-1 contacts the cam 2-10 via roller 2-9. The clamp arm 2-1 can rotate about a fixed axis 1 3-10. This ensures that the clamp 2-4 and the clamp shock pad 2-5 at the front of the clamp arm 2-1 move up and down, driven by the cam 2-10, as the cam rotates. When the cam rotates to its minimum diameter position and contacts the cam, the clamp arm is in its horizontal initial position. The clamp 2-4 and the shock pad can press the magnetic stripe against the display head 4-2, stopping the magnetic stripe from advancing and controlling the magnetic stripe detection device 4-1 to read the magnetic stripe data. The cam 2-10 continues to rotate away from the minimum diameter position. The clamp 2-4 and the shock pad are pushed away from the display head 4-2 by roller 2-9, leaving the magnetic stripe in a free, pressure-free state. The magnetic stripe is then fed one step by the feed mechanism, and the reading operation continues for the next step.

[0062] Because the briquetting arm spring 2-3 always has a certain elastic pressure on the pressure wheel arm, the vibration of the briquetting arm 2-1 in the up and down swinging can be reduced. In the entire working stroke, the roller 2-9 is always in contact with the surface of the cam 2-10, which ensures that the briquetting 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, which are used to detect magnetic stripes. The magnetic stripe detection device 4-1 is used to detect and visualize magnetic stripe information. Figure 2 In the figure, the magnetic stripe detection device 4-1 and the display head 4-2 are shown, and only the appearance diagrams of the two are given.

[0064] Magnetic stripe detection device 4-1 utilizes magneto-optical visualization technology. Its structure and principles are similar to existing magneto-optical detection technologies, such as those used for welding defect detection: A Magneto-Optical Diaphragm, Magneto-Optical Sensor, 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 Visualized Magnetic Flux Leakage Detection Device (CN 104764798B); and for damaged character detection: A Magnetic Field Enhanced Magneto-Optical Visualization Device (CN203455290 U). Therefore, this patent does not provide a detailed description of its structure. The visualization head 4-2 is the sensor of the magnetic stripe detection device 4-1. The aforementioned reference patents all provide detailed descriptions of its principles and structure, but this patent does not provide a detailed description.

[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 direction of magnetic stripe feeding is as small as possible, so as to avoid jamming at these positions when the magnetic stripe is fed.

[0066] Example 2:

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

[0068] First, perform the excitation operation. During the excitation operation, the flexible magnetic strip 0-1 is attached to the surface of the object to be measured 0-2. The handle 0-6 is held and the permanent magnet ring 0-3 is rotated to roll the flexible magnetic strip 0-1. While 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 instruction, 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 under the drive of 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 compressed by the magnetic stripe compression mechanism. The lower end of the compression arm 2-1 of the magnetic stripe compression mechanism contacts the cam 2-10 through the roller 2-9. The compression arm 2-1 can rotate around the fixed axis I 3-10, ensuring that the compression block 2-4 and the compression block shock pad 2-5 at the front of the compression 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 its minimum diameter position and contacts the roller 2-9, the pressure roller arm is in its horizontal initial position. The pressure block 2-4 and the shock-absorbing 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. The pressure block 2-4 and the shock-absorbing pad are pushed away from the display head 4-2 by the roller 2-9. The magnetic stripe is in a free state without pressure. At this time, the magnetic stripe is fed one step by the feeding mechanism, and the reading operation continues for the next step.

[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 rotary shaft 1 3-4 to rotate through the coupling 3-3. Driven by the rotary shaft 1 3-4, the rubber wheel 1-12 drives the magnetic stripe feeding mechanism to work and feed the magnetic stripe.

[0073] While the magnetic stripe is being fed, the rotary shaft I 3-4 transmits power to the transmission gear II 3-9 through the gear I 3-8, thereby driving the rotary shaft II 3-5 to rotate, the cam 2-10 of the rotary 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 feed amount reaches a step distance, the servo motor 3-1 stops working, and at this time 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 that position.

[0074] Although the above describes the specific embodiments 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 any creative work are still within the scope of protection of the present invention.

Claims

1. A non-destructive 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 includes 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 provided between the inlet guide groove and the outlet guide groove, and the magnetic stripe pressure wheel arm is fixed on the fixed axis I through a pressure wheel arm bearing, and the magnetic stripe pressure wheel arm swings around the fixed axis; a pressure wheel shaft is provided at the front 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 provided 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 axis II; The driving and transmission mechanism includes a servo motor, the output end of the servo motor is connected to a reducer, the output end of the reducer is connected to a coupling, the output end of the coupling is connected to a rotary shaft I, and the rotary shaft I and rotary shaft II are respectively fixed to the device housing through multiple rotary shaft supports and rotary shaft bearings; the rotary shaft I and rotary shaft II are respectively fixed to the gear I and gear II, and the gear I and gear II are meshed; The magnetic stripe pressing mechanism is arranged at the upper end of the magnetic stripe feeding mechanism, and the magnetic stripe pressing mechanism includes a pressing arm, the rear end of the pressing arm is mounted on the fixed shaft I through a pressing arm bearing, and the pressing arm swings around the fixed shaft I; A pressure block is provided at the front end of the pressure block arm, a pressure block anti-vibration pad is provided 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; A roller support arm is provided on the lower side of the pressure block arm, a cam roller shaft is provided on the roller support arm, a roller is provided 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.

2. A nondestructive testing device for metal materials using a soft magnetic strip according to claim 1, characterized in that: The excitation roller includes a permanent magnet ring, a magnet ring hub, a magnet ring roller and a handle. 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. The nondestructive testing device for metal materials using a soft magnetic strip according to claim 1, characterized in that: A spring guide column is provided at one end of the magnetic strip pressure wheel arm, and a pressure wheel arm spring is provided on the spring guide column.

4. The nondestructive testing device for metal materials using a soft magnetic strip according to claim 1, characterized in that: The magnetic stripe detection mechanism includes a magnetic stripe detection device and a display magnetic head, and the magnetic stripe detection device and the display magnetic head are used to detect the magnetic stripe.

5. A method for using a nondestructive testing device for metal materials using a soft magnetic strip according to any one of claims 1 to 4, characterized in that: The following steps are involved: First, perform the excitation operation. 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 magnet ring is rotated to roll the flexible magnetic strip. While 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 rotary 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 friction of the rubber wheel, and the magnetic stripe reaches the display head. 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 and moves out at the exit of the exit guide slot, thereby completing the magnetic stripe reading operation.

6. The method of use according to claim 5, wherein: 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 arm of the magnetic stripe pressing mechanism contacts the cam through a roller, and the pressing arm can rotate around the fixed axis I, ensuring that the pressing block and the pressing block shock pad at the front of the pressing 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 roller arm is in the horizontal initial position, and the pressure block and 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 shock-proof pad are pushed away from the display head by 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.

7. The method of use according to claim 5, wherein: 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 drives the rotary shaft I to rotate through the coupling. The rubber wheel is driven by the rotary shaft I to drive the magnetic stripe feeding mechanism to work and feed the magnetic stripe; While the magnetic stripe is being fed, the rotary shaft I transmits power to the transmission gear II through the gear I, thereby driving the rotary shaft II to rotate. The cam of the rotary shaft rotates, and the roller pushes the pressure block arm to rise, pushing the pressure block and the shock-absorbing 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. At this time, the pressure block arm reaches the minimum diameter of the cam, and the pressure block presses the display head, controlling the operation of the magnetic stripe detection device to read the magnetic stripe information at that position.

Images