A magnetic powder core detection device

Abstract

The utility model provides a kind of magnetic powder core detection device, it is related to magnetic powder core detection field, including base, rotating component, fixed component and detection component, fixed component is used to with magnetic powder core inner circle abutment to fix magnetic powder core;Detection component includes shell, slide and abutment plate, slide is along the height direction of base, the top end of slide is equipped with spring, the both ends of spring are connected abutment plate and shell respectively, the top surface of abutment plate is used to with magnetic powder core outer circle abutment;Power box is fixed on slide, power box is equipped with conducting pin, the free end of conducting pin is located on the side of power box away from abutment plate;Shell is also equipped with terminal box, terminal box is equipped with two terminal crimping, terminal crimping is located directly below conducting pin, detection gap is equipped between the free end of terminal crimping and the free end of conducting pin, terminal box is electrically connected with warning light.The utility model has high detection efficiency, the basis of the determination of detection result is intuitive and visible, low in cost, and high in applicability.

Description

Technical Field

[0001] This utility model relates to the field of magnetic powder core testing technology, and in particular to a magnetic powder core testing device. Background Technology

[0002] As the core device for achieving efficient bidirectional conversion of electrical energy, the performance of the energy storage inverter directly affects the stability and energy utilization rate of the energy storage system. The nanocrystalline inductor powder core, a key component of the energy storage inverter, often experiences localized bulging deformation on its outer circumference during the high-temperature, high-pressure molding process due to thermal expansion and mold cavity pressure. This results in roundness deviations in the final product. These deviations not only alter the distributed parameters of the inductor coils, causing electromagnetic interference, but also reduce the uniformity of the magnetic permeability of the core, affecting the power output accuracy and stability of the energy storage inverter. Therefore, accurately detecting the roundness of the magnetic powder core's outer circumference is crucial for ensuring the high-performance operation of the energy storage inverter.

[0003] Currently, the roundness inspection of the outer circle of magnetic powder cores is usually carried out using a three-dimensional coordinate measuring machine. Specifically, a high-precision probe on the three-dimensional coordinate measuring machine first contacts the outer circle of the magnetic powder core to acquire the coordinate data of the measured point in three-dimensional space point by point. During the measurement process, dozens or even hundreds of discrete coordinate points need to be collected to ensure data integrity. Next, the large number of collected discrete coordinate points are fitted into a surface model, and then compared and analyzed with the theoretical model of a standard circle to calculate the roundness deviation value of the magnetic powder core. Finally, the operator views the point cloud data distribution in the software interface and manually judges whether the calculated deviation value is within the allowable tolerance range, thus completing the entire inspection process.

[0004] However, in actual operation, the single complete inspection process of roundness detection using a three-dimensional coordinate measuring machine is not only time-consuming and inefficient, but also the judgment results rely on the operator's subjective comparison and lack intuitive and visual qualification marks, which can easily lead to missed detections or misjudgments due to human negligence. In addition, although the three-dimensional coordinate measuring machine can achieve high-precision measurement, the equipment cost is high, and small and medium-sized enterprises cannot afford the large-scale inspection needs, resulting in low applicability. Utility Model Content

[0005] Based on this, the purpose of this utility model is to provide a magnetic powder core testing device, which aims to solve the technical problems of the long time consumption, low testing efficiency, reliance on manual comparison of judgment results, lack of intuitive and visual qualification marks, and easy occurrence of missed detection or misjudgment in the existing technology of using a three-dimensional coordinate measuring machine to detect the roundness of the outer circle of magnetic powder core; in addition, the equipment is expensive and has low applicability.

[0006] The purpose of this utility model is to provide a magnetic powder core detection device, including a base, a rotating component rotatably disposed on the top of the base, a fixing component connected to the rotating component, and a detection component disposed on one side of the base, wherein the fixing component is used to abut against the inner circle of the magnetic powder core to fix the magnetic powder core.

[0007] The detection assembly includes a housing connected to one side of the base, a slide rod slidably disposed on the housing at one end away from the base, and an abutment plate located above the housing and fixed to the top of the slide rod. The slide rod is arranged along the height direction of the base, and a spring is also sleeved on the top of the slide rod. The two ends of the spring are respectively connected to the bottom surface of the abutment plate and the top surface of the housing. The top surface of the abutment plate is used to abut against the outer circle of the magnetic powder core.

[0008] A power supply box is fixed on the slide rod inside the housing. Conductive pins extending along the axial direction of the slide rod are respectively provided on both sides of the power supply box. The free ends of the conductive pins are located on the side of the power supply box away from the abutment plate.

[0009] The housing is also provided with a junction box. One end of the junction box is provided with two terminals. The free end of the terminals is located directly below the conductive pin, and a detection gap is provided between the free end of the terminals and the free end of the conductive pin. The other end of the junction box is electrically connected to a warning light.

[0010] Compared to existing technologies, the advantages of this magnetic powder core testing device are as follows: By driving the magnetic powder core to rotate continuously through a rotating component, combined with real-time detection by the testing component, a comprehensive inspection of the outer circumference of the magnetic powder core can be completed in a short time, improving testing efficiency. Furthermore, this application employs a detection gap design between the conductive pins and the terminals. When there are dimensional deviations or surface defects on the outer circumference of the magnetic powder core, the force change of the contact plate causes the slide rod to shift, precisely changing the detection gap and triggering an automatic warning light. This provides a clear and intuitive basis for determining whether the magnetic powder core is qualified. The entire testing process is based on objective changes in physical parameters and circuit continuity judgment, avoiding interference from human factors and effectively improving the accuracy and reliability of the test results, reducing product defect rates. Moreover, this application achieves the testing function through a combination of mechanical transmission and simple circuitry. The entire device's internal structure consists of common industrial components, resulting in low cost and high versatility. It can be adapted to the testing of magnetic powder cores of different specifications, eliminating the need to purchase multiple sets of equipment for different products, greatly reducing the company's capital investment and operating costs in testing equipment.

[0011] In addition, the magnetic powder core detection device according to the present invention may also have the following additional technical features:

[0012] Furthermore, the detection gap is 0.2mm-0.4mm.

[0013] Furthermore, the terminal block has a spring-loaded structure.

[0014] Furthermore, at least two connecting blocks are provided on one side of the base, and the two connecting blocks are spaced apart along the height direction of the base; a connecting rod is threaded to one end of the housing, and the two ends of the connecting rod are rotatably connected to the ends of the two connecting blocks away from the base, respectively.

[0015] Furthermore, at least two guide blocks are provided on the surface of the base located between the two connecting blocks, and the guide blocks are arranged along the height direction of the base; at least two guide grooves are provided on one end of the connecting rod on the housing, and the guide grooves are adapted to the guide blocks.

[0016] Furthermore, the rotating assembly includes a rotating seat, a gear ring sleeved on the circumferential surface of the rotating seat, a gear meshing with the gear ring, and a first motor fixed on the base. The output shaft of the first motor is fixedly connected to the gear. The rotating seat is a hollow columnar structure, and the outer surfaces on both axial sides of the rotating seat are respectively provided with annular grooves.

[0017] Furthermore, the base includes a support portion and two mounting portions located on opposite sides of the top surface of the support portion. An annular slider is provided at one end of the mounting portion away from the support portion. The annular slider is adapted to the annular groove to realize the rotational connection between the base and the rotating seat. One of the mounting portions is provided with the first motor.

[0018] Furthermore, the fixing assembly includes a second motor, a screw fixedly connected to the output shaft of the second motor, two mounting blocks threadedly connected to the screw, and a fixing rod connected to the mounting blocks. The second motor is fixed on one radial side of the rotating seat. The screw is located inside the rotating seat and is arranged radially along the rotating seat. The two ends of the screw are rotatably connected to one end of the fixing block, and the other end of the fixing block is fixedly connected to the inner surface of one axial side of the rotating seat. The mounting block passes through one axial side of the rotating seat and is slidably connected to the rotating seat. The fixing rod is arranged axially along the rotating seat and is used to abut against the inner circular surface of the magnetic powder core to fix the magnetic powder core. The abutment plate is provided directly below the fixing rod.

[0019] Furthermore, a first threaded structure is provided on the end of the screw near the second motor, and a second threaded structure is provided on the end of the screw away from the second motor. The first threaded structure and the second threaded structure are in opposite directions, and the screw is threadedly connected to the two mounting blocks through the first threaded structure and the second threaded structure, respectively.

[0020] Furthermore, the fixing rod is fitted with an anti-slip abutment sleeve, and the outer circumferential surface of the anti-slip abutment sleeve is provided with multiple anti-slip protrusions. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the magnetic powder core detection device of this utility model;

[0022] Figure 2 This is a cross-sectional structural diagram of the magnetic powder core detection device of this utility model;

[0023] Figure 3 This is a partial structural diagram of the detection component in the magnetic powder core detection device of this utility model;

[0024] Figure 4 This is a schematic diagram of the power supply box and junction box in the magnetic powder core testing device of this utility model;

[0025] Figure 5 This is a diagram showing the usage status of the magnetic powder core testing device of this utility model.

[0026] The above-mentioned figures include the following reference numerals: 10-base; 11-support part; 12-mounting part; 13-annular slider; 14-connecting block; 15-guide block; 21-rotating seat; 22-gear ring; 23-gear; 24-first motor; 31-second motor; 32-screw; 321-first thread structure; 322-second thread structure; 33-fixing block; 34-mounting block; 35-fixing rod; 36-anti-slip abutment sleeve; 41-housing; 42-slide rod; 43-abutment plate; 44-spring; 45-connecting rod; 46-power supply box; 461-conductive pin; 47-junction box; 471-terminal; 48-warning light; 50-magnetic powder core.

[0027] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0028] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0029] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Please see Figures 1 to 5 The diagram shows the magnetic powder core testing device of this utility model, including a base 10, a rotating assembly rotatably disposed on the top of the base 10, a fixing assembly connected to the rotating assembly, and a testing assembly disposed on one side of the base 10. Specifically, in this embodiment, the base 10 includes a support portion 11 and two mounting portions 12 disposed on two opposite sides of the top surface of the support portion 11. An annular slider 13 is provided at one end of the mounting portion 12 away from the support portion 11. The annular slider 13 is used to mount the rotating assembly to realize the rotational connection between the base 10 and the rotating assembly. At least two connecting blocks 14 are provided on one side of the base 10. The two connecting blocks 14 are spaced apart along the height direction of the base 10. In this embodiment, the two connecting blocks 14 are disposed on the outer side of one of the mounting portions 12 in the base 10. The connecting blocks 14 are used to connect with the housing 41 of the testing assembly, so that the housing 41 can form a stable assembly relationship with the base 10. Meanwhile, at least two guide blocks 15 are provided on the surface of the base 10 located between the two connecting blocks 14. The guide blocks 15 are arranged along the height direction of the base 10. The guide blocks 15 are used to guide the sliding of the detection component and ensure the stability and accuracy of the detection component during the movement.

[0032] As an example, the rotating assembly includes a rotating seat 21, a gear ring 22 sleeved on the circumference of the rotating seat 21, a gear 23 meshing with the gear ring 22, and a first motor 24 fixed on the base 10. The rotating seat 21 is a hollow cylindrical structure with annular grooves on its outer surfaces on both axial sides. These annular grooves are adapted to annular sliders 13 on the base 10, and the rotational connection between the rotating seat 21 and the top of the base 10 is achieved through the cooperation of the annular sliders 13 and the annular grooves. The first motor 24 is fixed on the outer side of another mounting part 12 in the base 10. The output shaft of the first motor 24 passes through the mounting part 12 and is fixedly connected to the middle of the gear 23. When the first motor 24 is started, the motor output shaft drives the gear 23 to rotate. Since the gear 23 meshes with the gear ring 22, it drives the rotating seat 21 to rotate around its axial center.

[0033] As an example, the fixing assembly includes a second motor 31, a screw 32 fixedly connected to the output shaft of the second motor 31, two mounting blocks 34 threadedly connected to the screw 32, and a fixing rod 35 connected to the mounting blocks 34. The second motor 31 is fixed to one radial side of the rotating seat 21. In this embodiment, a motor mounting hole is provided on the circumferential surface of the rotating seat 21. The housing 41 of the second motor 31 is installed in the motor mounting hole by an interference fit, thereby achieving a secure fixation of the second motor 31 on the rotating seat 21. The screw 32 is located inside the rotating seat 21, arranged radially along the rotating seat 21. One end of the screw 32 is fixedly connected to the output shaft of the second motor 31. The two axial ends of the screw 32 are rotatably connected to one end of the fixing block 33 via bearings. The other end of the fixing block 33 is fixed to the inner surface of the rotating seat 21 on one axial side by bolts or welding to ensure the stability of the screw 32 during rotation.

[0034] Furthermore, a first threaded structure 321 is provided on the end of the screw 32 closest to the second motor 31, and a second threaded structure 322 is provided on the end of the screw 32 furthest from the second motor 31. The first threaded structure 321 and the second threaded structure 322 are in opposite directions. The two mounting blocks 34 are threadedly connected to the first threaded structure 321 and the second threaded structure 322 on the screw 32, respectively. This bidirectional threaded design enables the two mounting blocks 34 to move synchronously in opposite directions or in a straight line along the axial direction of the screw 32 when the screw 32 rotates, thereby precisely adjusting the distance between the fixing rods 35 to accommodate magnetic powder cores 50 with different inner diameters.

[0035] Furthermore, one end of the mounting block 34 is provided with a threaded hole adapted to the first threaded structure 321 or the second threaded structure 322, and the other end of the mounting block 34 passes through one side of the axial direction of the rotating seat 21. A rectangular through hole adapted to the mounting block 34 is provided at the corresponding position of the rotating seat 21. The middle area of ​​the mounting block 34 along the axial direction of the rotating seat 21 is connected to the rectangular through hole by a clearance fit, so that the mounting block 34 can slide smoothly in the rectangular through hole while restricting the radial wobbling of the mounting block 34 and ensuring the movement stability of the fixing rod 35 provided on the mounting block 34.

[0036] Furthermore, the fixing rod 35 is used to abut against the inner circular surface of the magnetic powder core 50 to fix the magnetic powder core 50. In this embodiment, the fixing rod 35 is arranged along the axial direction of the rotating seat 21. The fixing rod 35 is a cylindrical structure and its length is greater than the axial length of the magnetic powder core 50 to ensure that the magnetic powder core 50 is securely fixed on the fixing rod 35.

[0037] Furthermore, an anti-slip abutment sleeve 36 is fitted onto the fixing rod 35. The inner diameter of the anti-slip abutment sleeve 36 is interference-fitted with the outer diameter of the fixing rod 35 to ensure that the anti-slip abutment sleeve 36 can be tightly fitted onto the fixing rod 35. Multiple anti-slip protrusions are provided on the outer circumferential surface of the anti-slip abutment sleeve 36. These protrusions increase the friction with the inner circular surface of the magnetic powder core 50, ensuring that the magnetic powder core 50 will not shift or shake during the testing process, thereby achieving stable fixation of the magnetic powder core 50. As a specific example, in this embodiment, the anti-slip abutment sleeve 36 is made of highly elastic silicone material.

[0038] As an example, the detection assembly is used to detect the outer diameter of the magnetic powder core 50. The detection assembly includes a housing 41 connected to one side of the base 10, a slide rod 42 slidably disposed on the housing 41 at the end away from the base 10, and an abutment plate 43 located above the housing 41 and fixed to the top of the slide rod 42. In this embodiment, a connecting rod 45 is installed at one end of the housing 41 by a threaded connection. The two ends of the connecting rod 45 are rotatably connected to two connecting blocks 14 on the base 10 by bearings. The bottom end of the connecting rod 45 is provided with a rotating handle. By rotating the connecting rod 45, the housing 41 can be moved up and down along the height direction of the base 10 to adjust the height of the housing 41. Furthermore, the end of the housing 41 with the connecting rod 45 is also provided with at least two guide grooves. The guide grooves are adapted to the guide blocks 15 provided on the surface of the base 10. During the detection process, the cooperation between the guide blocks 15 and the guide grooves can effectively limit the horizontal displacement of the housing 41, ensuring that the housing 41 can only slide up and down along the height direction of the base 10, providing a stable support environment for the detection process.

[0039] Furthermore, a slide rod 42 is slidably mounted on the end of the housing 41 away from the base 10. The slide rod 42 is positioned along the height direction of the base 10. The top end of the slide rod 42 is fixedly connected to the bottom surface of the abutment plate 43 by bolts or welding. The bottom end of the slide rod 42 extends to the outside of the bottom end of the housing 41. A spring 44 is also fitted on the top end of the slide rod 42. The two ends of the spring 44 are respectively connected to the bottom surface of the abutment plate 43 and the top surface of the housing 41. The elastic coefficient of the spring 44 is precisely designed according to the detection requirements of the magnetic powder core 50. When the abutment plate 43 contacts the outer circle of the magnetic powder core 50, the spring 44 is in a pre-compressed state, providing an initial pressure to the abutment plate 43 so that the abutment plate 43 can tightly fit the outer circle of the magnetic powder core 50. During the testing process, when there are defects such as protrusions or deformations on the outer circle of the magnetic powder core 50, the force change of the abutment plate 43 will compress the spring 44. The extension and contraction of the spring 44 corresponds to the displacement of the abutment plate 43, thus enabling sensitive detection of minute changes in the outer circle of the magnetic powder core 50.

[0040] Furthermore, a power supply box 46 is fixedly mounted on the rod body of the slide bar 42 inside the housing 41. One end of the power supply box 46 has a mounting hole for the slide bar 42, and the mounting hole and the slide bar 42 are interference-fitted to ensure the power supply box 46 is firmly fixed on the slide bar 42. The other end of the power supply box 46 has a battery compartment for installing a rechargeable lithium battery to provide a stable power supply to the entire detection circuit. On both sides of the end of the power supply box 46 with the battery compartment, conductive pins 461 extending axially along the slide bar 42 are vertically mounted, and the free ends of the conductive pins 461 are located on the side of the power supply box 46 away from the abutment plate 43.

[0041] Furthermore, a junction box 47 is provided on the side of the housing 41. Two terminals 471 are located at one end of the junction box 47 inside the housing 41. The terminals 471 have a spring-loaded structure, which allows them to elastically deform under slight external force. When the slide rod 42 moves the conductive pin 461, the terminals 471 can better engage with the conductive pin 461, maintaining the stability of the circuit connection. The free end of the terminal 471 is located directly below the conductive pin 461, and a detection gap of 0.2mm-0.4mm is provided between the free end of the terminal 471 and the free end of the conductive pin 461. As a specific example, in this embodiment, the detection gap between the free end of the terminal 471 and the free end of the conductive pin 461 is 0.3mm.

[0042] In this embodiment, the other end of the junction box 47 is exposed outside the housing 41, and a warning light 48 mounting compartment is provided on it for mounting the warning light 48, so as to realize the electrical connection between the junction box 47 and the warning light 48. The warning light 48 can be a high-brightness LED light. When there are defects such as protrusions or deformations on the outer circle of the magnetic powder core 50, the detection gap between the conductive pin 461 and the terminal 471 changes. When the set threshold is reached, the detection circuit is turned on and the warning light 48 lights up to remind the operator that there is an abnormality in the magnetic powder core 50.

[0043] In practical applications, the working principle of the magnetic powder core testing device of this invention can be summarized as follows:

[0044] First, the magnetic powder core 50 is attached to the two fixed rods 35. The second motor 31 is started, causing the two mounting blocks 34 on the screw 32 to move in opposite directions along the axial direction of the screw 32. The mounting blocks 34 drive the fixed rods 35 to move synchronously, so that the anti-slip abutment sleeves 36 on the two fixed rods 35 are in close contact with the inner circular surface of the magnetic powder core 50, ensuring that the magnetic powder core 50 remains stable during the testing process and does not shift or rotate. Next, the position of the abutment plate 43 is adjusted according to the height of the magnetic powder core 50. Specifically, by rotating the rotating handle at the bottom of the connecting rod 45, the connecting rod 45 is rotated, which in turn causes the housing 41 to move up and down, changing the vertical position of the housing 41 so that the top surface of the abutment plate 43 can abut with the outer circular surface of the magnetic powder core 50. Finally, the first motor 24 is started. The output shaft of the first motor 24 drives the gear 23 to rotate. The gear 23 meshes with the gear ring 22, transmitting the rotational motion to the rotating seat 21. The rotating seat 21 drives the fixed magnetic powder core 50 to rotate uniformly around the axial center. The outer surface of the magnetic powder core 50 is in continuous contact with the abutment plate 43. If there are defects such as protrusions or deformations on the outer surface of the magnetic powder core 50, the force on the abutment plate 43 will change. The change in force on the abutment plate 43 is transmitted through the slide rod 42, causing the slide rod 42 to move accordingly inside the housing 41. The displacement of the slide rod 42 changes the detection gap between the conductive pin 461 and the terminal 471. When the gap reaches the set threshold, the terminal 471 contacts the conductive pin 461, the detection circuit is turned on, and the warning light 48 lights up to indicate that there is an abnormality in the magnetic powder core 50.

[0045] Compared to existing technologies, the advantages of this magnetic powder core testing device are as follows: By driving the magnetic powder core to rotate continuously through a rotating component, combined with real-time detection by the testing component, a comprehensive inspection of the outer circumference of the magnetic powder core can be completed in a short time, improving testing efficiency. Furthermore, this application employs a detection gap design between the conductive pins and the terminals. When there are dimensional deviations or surface defects on the outer circumference of the magnetic powder core, the force change of the contact plate causes the slide rod to shift, precisely changing the detection gap and triggering an automatic warning light. This provides a clear and intuitive basis for determining whether the magnetic powder core is qualified. The entire testing process is based on objective changes in physical parameters and circuit continuity judgment, avoiding interference from human factors and effectively improving the accuracy and reliability of the test results, reducing product defect rates. Moreover, this application achieves the testing function through a combination of mechanical transmission and simple circuitry. The entire device's internal structure consists of common industrial components, resulting in low cost and high versatility. It can be adapted to the testing of magnetic powder cores of different specifications, eliminating the need to purchase multiple sets of equipment for different products, greatly reducing the company's capital investment and operating costs in testing equipment.

[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model application should be determined by the appended claims.

Claims

1. A magnetic powder core testing device, characterized in that, It includes a base, a rotating assembly rotatably disposed on the top of the base, a fixing assembly connected to the rotating assembly, and a detection assembly disposed on one side of the base, wherein the fixing assembly is used to abut against the inner circle of the magnetic powder core to fix the magnetic powder core. The detection assembly includes a housing connected to one side of the base, a slide rod slidably disposed on the housing at one end away from the base, and an abutment plate located above the housing and fixed to the top of the slide rod. The slide rod is arranged along the height direction of the base, and a spring is also sleeved on the top of the slide rod. The two ends of the spring are respectively connected to the bottom surface of the abutment plate and the top surface of the housing. The top surface of the abutment plate is used to abut against the outer circle of the magnetic powder core. A power supply box is fixed on the slide rod inside the housing. Conductive pins extending along the axial direction of the slide rod are respectively provided on both sides of the power supply box. The free ends of the conductive pins are located on the side of the power supply box away from the abutment plate. The housing is also provided with a junction box. One end of the junction box is provided with two terminals. The free end of the terminals is located directly below the conductive pin, and a detection gap is provided between the free end of the terminals and the free end of the conductive pin. The other end of the junction box is electrically connected to a warning light.

2. The magnetic powder core testing device according to claim 1, characterized in that, The detection gap is 0.2mm-0.4mm.

3. The magnetic powder core testing device according to claim 1, characterized in that, The terminal block has a spring-loaded structure.

4. The magnetic powder core testing device according to claim 1, characterized in that, At least two connecting blocks are provided on one side of the base, and the two connecting blocks are spaced apart along the height direction of the base; a connecting rod is threaded to one end of the housing, and the two ends of the connecting rod are rotatably connected to the ends of the two connecting blocks away from the base.

5. The magnetic powder core testing device according to claim 4, characterized in that, At least two guide blocks are also provided on the surface of the base located between the two connecting blocks, and the guide blocks are arranged along the height direction of the base; at least two guide grooves are also provided on one end of the connecting rod on the housing, and the guide grooves are adapted to the guide blocks.

6. The magnetic powder core testing device according to claim 1, characterized in that, The rotating assembly includes a rotating seat, a gear ring sleeved on the circumference of the rotating seat, a gear meshing with the gear ring, and a first motor fixed on the base. The output shaft of the first motor is fixedly connected to the gear. The rotating seat is a hollow columnar structure, and annular grooves are respectively provided on the outer surfaces of the two axial sides of the rotating seat.

7. The magnetic powder core testing device according to claim 6, characterized in that, The base includes a support portion and two mounting portions located on opposite sides of the top surface of the support portion. An annular slider is provided at one end of the mounting portion away from the support portion. The annular slider is adapted to the annular groove to realize the rotational connection between the base and the rotating seat. One of the mounting portions is provided with the first motor.

8. The magnetic powder core testing device according to claim 6, characterized in that, The fixing assembly includes a second motor, a screw fixedly connected to the output shaft of the second motor, two mounting blocks threadedly connected to the screw, and a fixing rod connected to the mounting blocks. The second motor is fixed on one radial side of the rotating seat. The screw is located inside the rotating seat and is arranged radially along the rotating seat. The two ends of the screw are rotatably connected to one end of the fixing block, and the other end of the fixing block is fixedly connected to the inner surface of one axial side of the rotating seat. The mounting block passes through one axial side of the rotating seat and is slidably connected to the rotating seat. The fixing rod is arranged axially along the rotating seat and is used to abut against the inner circular surface of the magnetic powder core to fix the magnetic powder core. The abutment plate is provided directly below the fixing rod.

9. The magnetic powder core testing device according to claim 8, characterized in that, The screw has a first threaded structure on the end of the rod closest to the second motor, and a second threaded structure on the end of the screw away from the second motor. The first threaded structure and the second threaded structure are in opposite directions. The screw is threadedly connected to the two mounting blocks through the first threaded structure and the second threaded structure, respectively.

10. The magnetic powder core testing device according to claim 8, characterized in that, The fixing rod is fitted with an anti-slip abutment sleeve, and the outer circumferential surface of the anti-slip abutment sleeve is provided with multiple anti-slip protrusions.

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