A portable magnetic particle flaw detector

Abstract

The utility model provides a kind of portable magnetic particle flaw detector, when being energized to red copper coil, make the magnetic field inside red copper coil, and through metal plate conduction to magnetized contact foot, to realize the magnetization to workpiece between magnetized contact foot, magnetization efficiency is high and make simple and convenient;At the same time, by setting up camera to the image of workpiece surface after spraying magnetic suspension or magnetic powder is acquired, and then the image collected can be wirelessly transmitted to external workpiece image recognition device by wifi module and screened with magnetic mark, to quickly check out workpiece with defect, significantly improve the detection efficiency of workpiece, and it is beneficial to reduce labor cost.In addition, by the setting of magnetic gathering cover, the magnetic force line diffused when the metal plate conducts is restrained, the magnetic field is concentrated in the magnetized contact foot area, so that the magnetic field intensity at the magnetized contact foot is significantly improved, further improving the magnetization efficiency.

Description

Technical Field

[0001] This utility model relates to the field of magnetic particle inspection technology, and in particular to a portable magnetic particle inspection instrument. Background Technology

[0002] Magnetic particle testing is a non-destructive testing method based on the magnetic field at defects in ferromagnetic materials after magnetization attracting magnetic particles to form magnetic traces. It is widely used in aviation, rail transportation, petrochemical and other fields.

[0003] Some existing portable magnetic particle flaw detectors typically require workers to manually magnetize the surface of a workpiece, then manually spray magnetic powder or magnetic suspension onto the magnetized workpiece, and finally manually inspect and select workpieces with magnetic mark defects. However, the speed of manual screening is limited by the operator's eyesight and judgment, resulting in low efficiency and accuracy in screening for workpiece defects, while also increasing labor costs.

[0004] Therefore, in order to improve the efficiency and quality of workpiece screening during magnetic particle testing, it is necessary to provide a new type of magnetic particle testing device. Utility Model Content

[0005] To address the issues of low efficiency and poor inspection quality in manual defect detection of magnetized workpieces in existing technologies, this invention provides a portable magnetic particle flaw detector.

[0006] A portable magnetic particle flaw detector includes a housing, a handle, and two pairs of magnetized contact feet located at the bottom of the housing. The bottom of the handle is integrally formed with the top of the housing. An installation cavity is formed inside the housing, and a heat insulation plate is provided within the installation cavity. The heat insulation plate divides the installation cavity into a first cavity and a second cavity that are interconnected and sequentially arranged away from the handle. The walls of both the first and second cavities have several heat dissipation holes. A battery compartment, a control circuit board, and a Wi-Fi module for communication with an external workpiece image recognition device are provided within the first cavity. A power supply battery is installed in the battery compartment. The second cavity contains a pair of copper coils; each end of the copper coil is connected to a metal plate, and the metal plates penetrate the second cavity and extend to the outside; the battery compartment, Wi-Fi module, and copper coils are all electrically connected to the control circuit board; the magnetized contacts are located at the four corners of the bottom of the housing and are connected to the corresponding metal plates; a magnetic shield is provided on the outer side of the metal plate away from the copper coil, and the magnetic shield is connected to the magnetized contacts; a lighting assembly and a camera for acquiring workpiece images are also provided on the bottom of the housing, and the lighting assembly and camera are both electrically connected to the control circuit board. Further, an opening is provided on one side of the battery compartment, and a battery cover is detachably connected to the battery compartment; the battery is detachably connected to the power supply battery compartment.

[0007] Furthermore, a cooling fan is also provided inside the second cavity; the cooling fan is electrically connected to the control circuit board, and the cooling fan is directly facing the heat dissipation holes on the cavity wall of the second cavity.

[0008] Furthermore, the second cavity has an isolation chamber located on the bottom side of the housing that communicates with the first cavity. The inner wall of the isolation chamber is provided with a heat insulation layer and an electromagnetic isolation layer. The lighting assembly and the camera are both installed at the bottom of the isolation chamber.

[0009] Furthermore, the magnetized contact includes a metal yoke and a magnetic head; the metal yoke is rotatably connected to the corresponding metal plate by connecting bolts; the magnetic head is rotatably connected to the metal yoke by hinge bolts.

[0010] Furthermore, the lighting assembly includes several ultraviolet lights and several white lights arranged around the outside of the camera.

[0011] Furthermore, a switching knob for switching between white light and ultraviolet light is provided on one side of the housing, and the switching knob is electrically connected to the control circuit board.

[0012] Furthermore, a camera button for turning the camera on and off is provided at the bottom of the handle, and a start button for turning the magnetization on and off is provided on the outer side of the housing. The start button and the camera button are electrically connected to the control circuit board.

[0013] Furthermore, one side of the outer shell is fixedly connected to a magnetic suspension tank; a nozzle is provided at one end of the bottom of the shell, and a micro pump is provided in the second cavity. The micro pump is electrically connected to the control circuit board, and the inlet section and outlet end of the micro pump are respectively connected to the magnetic suspension tank and the nozzle through a connecting pipe.

[0014] Furthermore, a spray switch for turning the micro liquid pump on and off is provided below the handle, and the spray switch is electrically connected to the control circuit board.

[0015] The beneficial effects of this utility model are as follows: The portable magnetic particle flaw detector provided by this utility model generates a magnetic field within the copper coil when energized, and conducts it to the magnetized contacts through a metal plate, thereby magnetizing the workpiece located between the magnetized contacts. The magnetization efficiency is high and the operation is simple and convenient. At the same time, by setting a camera to acquire images of the workpiece surface after spraying magnetic suspension or magnetic powder, the acquired images can be wirelessly transmitted to an external workpiece image recognition device via a Wi-Fi module for screening images containing magnetic traces, thereby quickly identifying defective workpieces, significantly improving the workpiece inspection efficiency, and helping to reduce labor costs. In addition, by setting a magnetic concentrator, the magnetic lines of force diffused during conduction by the metal plate are constrained, so that the magnetic field is concentrated in the magnetized contact area, thereby significantly increasing the magnetic field strength at the magnetized contacts and further improving the magnetization efficiency. Attached Figure Description

[0016] Figure 1 A schematic diagram of the structure of a portable magnetic particle flaw detector provided by this utility model; Figure 2 A cross-sectional structural schematic diagram of a portable magnetic particle flaw detector provided by this utility model; Figure 3 A schematic diagram of the bottom structure of a portable magnetic particle flaw detector provided by this utility model.

[0017] Attached Figure

[0018] 1. Housing; 2. Handle; 201. Open / Close Button; 202. Camera Button; 3. Magnetized Contact; 31. Metal Magnetic Yoke; 32. Magnetic Head; 4. Heat Insulation Plate; 5. First Chamber; 6. Second Chamber; 7. Battery Compartment; 71. Power Supply Battery; 72. Battery Cover; 8. Control Circuit Board; 9. WiFi Module; 10. Copper Coil; 11. Metal Plate; 12. Magnetic Concentrator; 13. Camera; 14. Ultraviolet Illuminator; 15. White Illuminator; 16. Switch Knob; 17. Isolation Chamber; 18. Cooling Fan; 19. Magnetic Suspension Tank; 20. Nozzle; 21. Miniature Liquid Pump; 22. Connecting Pipe; 23. Spray Switch. Detailed Implementation

[0019] To provide a more detailed description of this utility model, the following description is provided in conjunction with the accompanying drawings. It should be noted that the embodiments described below are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0020] refer to Figure 1 As shown, a portable magnetic particle flaw detector is used to magnetize metal workpieces. It includes a housing 1, a handle 2, and two pairs of magnetizing contacts 3 located at the bottom of the housing 2. The bottom of the handle 2 is integrally formed with the top of the housing 1. The handle makes it easy for the user to hold and perform the magnetization operation.

[0021] Specifically, refer to Figure 1 and Figure 2 As shown, the housing 1 has an internal mounting cavity (not shown in the figure). A heat insulation plate 4 is installed within the mounting cavity, dividing it into a first cavity 5 and a second cavity 6 that are interconnected and arranged sequentially away from the handle 2. Both the first cavity 5 and the second cavity 6 have several heat dissipation holes on their walls. The heat insulation plate 4 prevents heat generated inside one cavity from adversely affecting the other; the heat dissipation holes allow heat to dissipate quickly from the cavity, preventing accidents caused by heat accumulation.

[0022] The first cavity 5 contains a battery compartment 7, a control circuit board 8, and a Wi-Fi module 9 for communication with an external workpiece image recognition device. Both the battery compartment 7 and the Wi-Fi module 9 are electrically connected to the control circuit board 8. The Wi-Fi module 9 can wirelessly transmit data acquired by the control circuit board 8 to the outside world, where the external workpiece image recognition device can receive, analyze, and store the data, or transmit it back.

[0023] A power supply battery 71 is installed inside the battery compartment 7 to supply power to the various components. An opening is provided on one side of the battery compartment 7, and a battery cover 72 is detachably connected to the battery compartment. The power supply battery 71 is detachably connected to the battery compartment 7. A start button 201 for initiating and deactivating magnetization is provided on the outer side of the housing 1. The start button 201 is electrically connected to the control circuit board 8, and the power supply can be turned on and off via the start button 201.

[0024] The magnetic particle flaw detector is powered by a battery 71, eliminating the need for a connection cable to an external power source. This eliminates the need for wiring and the dragging of a cable during operation, improving its convenience. Furthermore, the detachable design allows for quick replacement of the battery 71 after it is depleted, further simplifying operation and enhancing usability.

[0025] A pair of copper coils 10 are provided inside the second cavity 6. Copper has high conductivity, which ensures that electrical energy is efficiently converted into magnetic energy and reduces coil heat loss. Each end of the copper coil 10 is connected to a metal plate 11, and the metal plates 11 penetrate the second cavity 6 and extend to the outside. The copper coils 10 are electrically connected to the control circuit board 8. The magnetized contacts 3 are located at the four corners of the bottom of the housing 1 and are connected to the corresponding metal plates 11. In this embodiment, the four magnetized contacts 3 are symmetrically distributed at the bottom of the housing 1, which effectively prevents the magnetic particle flaw detector from sliding or tipping over during use and improves magnetization efficiency.

[0026] The magnetized contact 3 includes a metal yoke 31 and a magnetic head 32; the metal yoke 31 is rotatably connected to the corresponding metal plate 11 via connecting bolts; the magnetic head 32 is rotatably connected to the metal yoke 31 via hinge bolts. In this embodiment, the metal yoke 31 is made of laminated silicon steel sheets.

[0027] The metal yoke 31 and the magnetic head 32 are connected by a double-bolt hinge structure, which enables dual-axis angle adjustment and can automatically fit into the non-planar contact surface to ensure magnetic circuit closure and reduce contact resistance.

[0028] Powered by the battery 71, the control circuit board 8 energizes the copper coil, thereby generating a strong magnetic field using the magnetic effect of the current. The magnetic field is then conducted from the inside of the cavity to the external metal yoke 31 through the metal plate 11, and then the magnetic field is concentrated to the magnetic head through the metal yoke 31, forming a closed magnetic circuit, which can magnetize the workpiece between the magnetized contacts 3.

[0029] A magnetic shield 12 is provided on the outer side of the metal plate 11 away from the copper coil 10, and the magnetic shield 12 is connected to the magnetized contact 3.

[0030] The magnetic shield 12 is made of a soft magnetic material with high magnetic permeability, which can more effectively concentrate and guide the magnetic lines of force conducted to the metal plate 11 to a specific end of the magnetized contact 3, restrict the magnetic field from spreading to non-target areas, significantly increase the magnetic flux density of the working area, and improve the magnetization efficiency.

[0031] refer to Figure 2 As shown in the diagram, the bottom of the shell 1 is also equipped with a lighting assembly and a camera 13 for acquiring workpiece images, and both the lighting assembly and the camera 13 are electrically connected to the control circuit board 8. The bottom of the handle 2 is also equipped with a camera button 202 for turning the camera 13 on and off, and the camera button 202 is electrically connected to the control circuit board 8. After the workpiece has been magnetized and sprayed with magnetic powder, pressing the camera button 202 will activate the camera 13 to acquire an image of the workpiece. The acquired image is then transmitted through the control circuit board 8 to an external workpiece image recognition device for image recognition. The workpiece image recognition device processes the acquired image through a preset program, filters out images containing magnetic marks to identify defective workpieces, and informs the user. Compared to manual inspection, visual inspection screening is more efficient and has a stronger ability to visually identify workpieces with small cracks, effectively reducing labor costs and improving the efficiency and quality of workpiece screening.

[0032] The lighting assembly includes several ultraviolet lights 14 and several white lights 15 arranged around the outside of the camera 13. A switching knob 16 for switching between the white lights 15 and the ultraviolet lights 14 is provided on one side of the housing 1, and the switching knob 16 is electrically connected to the control circuit board 8.

[0033] In practical applications, when the magnetic powder suspension contains fluorescent agents, ultraviolet light lamp 14 can be used for illumination to form a clear fluorescent magnetic trace image on the workpiece surface. When the magnetic powder suspension does not contain fluorescent agents, white light lamp 15 is used for illumination to observe the distribution of non-fluorescent magnetic powder, facilitating the acquisition of magnetic trace images of the workpiece by the camera. White light lamp 15 can also be used for supplementary lighting during image acquisition.

[0034] The second cavity 6, located on one side of the bottom of the housing 1, has an isolation chamber 17 communicating with the first cavity 5. The inner wall of the isolation chamber 17 is provided with a heat insulation layer and an electromagnetic isolation layer. The lighting assembly and the camera 14 are both installed at the bottom of the isolation chamber 17. In actual installation, the light-emitting part of the lighting assembly and the lens of the camera 14 pass through the isolation chamber 17 to the outside, while the rest are located inside the isolation chamber 17. The isolation chamber 17 is designed to prevent the environment outside the isolation chamber 17 from affecting the normal operation of the components of the lighting assembly and the camera 14.

[0035] By setting up a heat insulation layer and an electromagnetic isolation layer in the isolation chamber 17, the heat or magnetic field generated by the copper coil 10 during operation can be effectively avoided from affecting the heat insulation layer and the electromagnetic isolation layer, so that they can maintain normal performance to complete the illumination of the workpiece or the acquisition of images.

[0036] In some embodiments, a cooling fan 18 is further provided in the second cavity; the cooling fan 18 is electrically connected to the control circuit board 8, and the cooling fan 18 is directly facing the heat dissipation holes on the cavity wall of the second cavity 6. The cooling fan 18 can dissipate the large amount of heat generated when the copper coil is working, improving heat dissipation efficiency and preventing heat accumulation from affecting overall performance or even causing safety accidents.

[0037] The working principle of the portable magnetic particle flaw detector provided by this utility model is as follows: The magnetic particle flaw detector is placed above the workpiece to be inspected, so that the workpiece to be inspected is located between each magnetized contact foot; the flaw detector is turned on by pressing the start button 201, and the power supply battery 71 supplies power, so that the copper coil 10 is energized to generate a magnetic field, which is conducted to the magnetized contact foot through the metal plate, thereby magnetizing the workpiece located between the magnetized contact foot; then, magnetic suspension liquid or magnetic powder is sprayed on the workpiece, and the image of the workpiece surface after spraying magnetic suspension liquid or magnetic powder is acquired by setting a camera 13, and then the acquired image is wirelessly transmitted to an external workpiece image recognition device through the Wi-Fi module 9 for screening of images containing magnetic traces, thereby quickly identifying images containing magnetic traces, which are defective workpieces.

[0038] In some embodiments, one side of the housing 1 is fixedly connected to a magnetic suspension tank 19; a nozzle 20 is provided at one bottom end of the housing 1, and a miniature pump 21 is provided in the second cavity 6. The miniature pump 21 is electrically connected to the control circuit board 8, and the inlet and outlet ends of the miniature pump 21 are respectively connected to the magnetic suspension tank 19 and the nozzle 20 through a connecting pipe 22. In this embodiment, the miniature pump 21 is located in an isolation chamber, and the connecting pipe 22 passes through the isolation chamber and communicates with the magnetic suspension tank 19.

[0039] Below the handle 2 is a spray switch 23 for turning the micro liquid pump 21 on and off. The spray switch 23 is electrically connected to the control circuit board 8.

[0040] After magnetizing the workpiece, the nozzle 20 can be aligned with the workpiece's location, and the spray switch 23 can be turned on to start the micro-pump 21. The magnetic suspension liquid in the magnetic suspension tank 19 is drawn and pumped through the connecting pipe 22 to the nozzle 20 and sprayed onto the workpiece surface, completing the magnetic powder spraying step. No manual operation is required, further improving the efficiency and automation of the inspection. After the magnetic powder spraying of the workpiece is completed, the camera 13 can be aimed at the workpiece to acquire images.

[0041] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model and do not limit the utility model to the specific implementations described. Obviously, other modifications and variations can be made based on the content of this specification. The embodiments selected and specifically described in this specification are intended to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. They are not intended to limit the utility model, and any simple modifications to this utility model fall within the protection scope of this utility model.

Claims

1. A portable magnetic particle flaw detector, comprising a housing, a handle, and two pairs of magnetized contact feet located at the bottom of the housing, characterized in that, The bottom of the handle is integrally formed with the top of the housing; The housing has an internal mounting cavity, and a heat insulation plate is provided inside the mounting cavity. The heat insulation plate divides the mounting cavity into a first cavity and a second cavity that are interconnected and arranged sequentially in the direction away from the handle. The walls of the first cavity and the second cavity are provided with a plurality of heat dissipation holes. The first cavity contains a battery compartment, a control circuit board, and a Wi-Fi module for communicating with an external workpiece image recognition device; a power supply battery is installed in the battery compartment; a pair of copper coils are provided in the second cavity; each end of the copper coil is connected to a metal plate, and the metal plates penetrate the second cavity and extend to the outside; the battery compartment, Wi-Fi module, and copper coils are all electrically connected to the control circuit board. The magnetized contacts are located at the four corners of the bottom of the housing and are connected to the corresponding metal plates. A magnetic shield is provided on the outer side of the metal plate away from the copper coil, and the magnetic shield is connected to the magnetized contacts. The bottom of the housing is also provided with a lighting assembly and a camera for acquiring images of the workpiece, and the lighting assembly and the camera are both electrically connected to the control circuit board.

2. The portable magnetic particle flaw detector according to claim 1, characterized in that, The battery compartment has an opening on one side, and a battery cover that is detachably connected to the battery compartment is provided on the opening; the power supply battery is detachably connected to the battery compartment.

3. A portable magnetic particle flaw detector according to claim 1, characterized in that, The second cavity is also equipped with a cooling fan; the cooling fan is electrically connected to the control circuit board, and the cooling fan is directly facing the heat dissipation holes on the cavity wall of the second cavity.

4. A portable magnetic particle flaw detector according to claim 1, characterized in that, The second cavity is located on one side of the bottom of the shell and has an isolation chamber that communicates with the first cavity. The inner wall of the isolation chamber is provided with a heat insulation layer and an electromagnetic isolation layer. The lighting group and the camera are both installed at the bottom of the isolation chamber.

5. A portable magnetic particle flaw detector according to claim 1, characterized in that, The magnetized contact includes a metal yoke and a magnetic head; the metal yoke is rotatably connected to the corresponding metal plate by connecting bolts; the magnetic head is rotatably connected to the metal yoke by hinge bolts.

6. A portable magnetic particle flaw detector according to claim 1, characterized in that, The lighting assembly includes several ultraviolet lights and several white lights arranged around the outside of the camera.

7. A portable magnetic particle flaw detector according to claim 6, characterized in that, A switching knob for switching between white light and ultraviolet light is provided on one side of the housing, and the switching knob is electrically connected to the control circuit board.

8. A portable magnetic particle flaw detector according to claim 1, characterized in that, The bottom of the handle is provided with a camera button for turning the camera on and off, and the outer side of the housing is provided with a start button for turning the magnetization on and off. The start button and the camera button are electrically connected to the control circuit board.

9. A portable magnetic particle flaw detector according to claim 1, characterized in that, The outer side of the housing is fixedly connected to a magnetic suspension tank; a nozzle is provided at one end of the bottom of the housing, and a micro pump is provided in the second cavity. The micro pump is electrically connected to the control circuit board, and the inlet and outlet of the micro pump are respectively connected to the magnetic suspension tank and the nozzle through a connecting pipe.

10. A portable magnetic particle flaw detector according to claim 9, characterized in that, Below the handle is a spray switch for turning the micro liquid pump on and off, and the spray switch is electrically connected to the control circuit board.

Images