Magnetic material magnetic field intensity detection method and detection system

Abstract

The invention relates to a magnetic material magnetic field intensity detection method and system, and relates to the field of magnetic field intensity detection, and the magnetic material magnetic field intensity detection method comprises the following steps: S10, enabling a magnetic material to pass through a plurality of Hall sensors arranged in an array; s20, acquiring detection signals of a plurality of Hall sensors; s30, processing the detection signals of the plurality of Hall sensors to obtain magnetic field intensities of different parts of the magnetic material; s40, the magnetic field intensity of each part of the magnetic material is compared with a set magnetic field intensity threshold value, and if the magnetic field intensity is larger than the set threshold value, it is judged that the magnetic field intensity of the magnetic material is unqualified; the magnetic material magnetic field intensity detection system comprises a magnetic material conveying unit, a magnetic field intensity detection unit, a detection signal processing unit and an unqualified magnetic material processing unit, and the magnetic field intensity of different areas in the magnetic material can be detected by utilizing a Hall sensor array arranged on a magnetic material conveying path, so that the magnetic material magnetic field intensity detection method is realized. The method has the advantages of high detection sensitivity and high detection accuracy.

Description

Technical Field

[0001] The present application relates to the field of magnetic field strength detection, and in particular to a method for detecting the magnetic field strength of a magnetic material. In addition, the present application also relates to a system for detecting the magnetic field strength of a magnetic material. Background Art

[0002] Rare earth permanent magnet material is an alloy composed of samarium, neodymium mixed with rare earth metals and transition metals (such as cobalt, iron, etc.), which is pressed and sintered by powder metallurgy method and magnetized by magnetic field. It is a kind of magnetic material with the highest magnetic properties found so far. With the advancement of science and technology, rare earth permanent magnet materials have been widely used in electronic communications, instrumentation, micro motors, household appliances, medical care, new energy and military fields.

[0003] After sintering and before magnetizing, rare earth permanent magnet materials need to undergo a series of quality tests, including the shape, size, magnetic field strength, etc. of the magnetic materials, to meet the use requirements of the magnetic materials in products. Among them, the excessive local magnetic field strength in the magnetic material will affect the performance of the magnetic material after magnetization. Therefore, it is necessary to test the magnetic field strength of each magnetic material, eliminate the magnetic material with unqualified magnetic field strength, and ensure the performance of the permanent magnet formed after magnetization.

[0004] The traditional method of detecting the magnetic field strength of magnetic materials is to let the magnetic material pass through a magnetic induction detection coil, and detect the magnetic field strength of the magnetic material based on the size of the induced current generated in the magnetic induction coil. The magnetic field detection sensitivity of this detection method is poor, and it is difficult to locate the position where the magnetic field is generated in the magnetic material. Recently, Hall sensors are commonly used to detect the magnetic field strength of magnetic materials. Hall sensors are a type of sensor based on the Hall effect of semiconductors, which have the advantages of small size, high detection accuracy, and strong shock resistance. However, the existing method of using Hall sensors to detect the magnetic field strength of magnetic materials is usually used to detect the magnetic field strength within a certain range. It is difficult to accurately locate the magnetic field, and the detection sensitivity of the magnetic field strength in a smaller local area is poor. Summary of the invention

[0005] In order to improve the sensitivity of detecting the magnetic field strength of a local area of ​​a magnetic material, the present application provides a method and a system for detecting the magnetic field strength of a magnetic material.

[0006] The magnetic material magnetic field strength detection method provided in this application adopts the following technical solution: A method for detecting the magnetic field strength of a magnetic material comprises the following steps: S10: allowing the magnetic material to pass through a plurality of Hall sensors arranged in an array; S20: obtaining detection signals of the plurality of Hall sensors; S30: processing the detection signals of the plurality of Hall sensors to obtain the magnetic field strength of different parts of the magnetic material; S40: comparing the magnetic field strength of each part of the magnetic material with a set magnetic field strength threshold value, and if the magnetic field strength is greater than the set threshold value, determining that the magnetic field strength of the magnetic material is unqualified.

[0007] By adopting the above technical solution, the magnetic field strength of the magnetic material is measured using multiple array-shaped Hall sensors, and the magnetic induction intensity formed by the magnetic field strength of different local positions in the magnetic material according to different coordinate weights can be obtained respectively, and different Hall potential differences are formed in different Hall sensors, so that the magnetic field strength of different parts of the magnetic material can be restored through the Hall potential differences generated by different Hall sensors, and the detection sensitivity of the magnetic field strength of smaller local areas in the magnetic material is improved. By using the different movements of the magnetic material and the Hall potential differences generated by different Hall sensors arranged in an array, the detection signal including the magnetic field strength of more local positions in the magnetic material can be detected, and the detection resolution of the magnetic field strength in the magnetic material can be improved, which is conducive to discovering the abnormality of the magnetic field strength of smaller local areas in the magnetic material, and accurately locating the area with abnormal magnetic field strength.

[0008] In a specific possible implementation, the magnetic material magnetic field strength detection method of the present application also includes step S35: performing C-scan calibration according to the positions of the multiple Hall sensors and the electrical signals detected by the multiple Hall sensors to obtain a C-scan distribution diagram of the magnetic material.

[0009] By adopting the above technical solution and using the Hall potential difference detected by Hall sensors at multiple different positions to perform C-scan calibration, it is possible to obtain a C-scan distribution diagram that reflects the magnetic field strength at different positions of the magnetic material. The C-scan distribution diagram can be used to intuitively reflect the magnetic field strength at a large number of local small positions in the magnetic material.

[0010] In a specific feasible implementation scheme, in step S35, different grayscale colors are used in the C-scan distribution diagram to represent the magnetic field strength of the magnetic material. The higher the magnetic field strength, the darker the grayscale color. The part of the magnetic field strength of the magnetic material that exceeds the set threshold is represented by red in the C-scan distribution diagram.

[0011] By adopting the above technical solution, different shades of gray are used to represent the magnetic field strength at different positions of the magnetic material, so that the magnetic field strength at different parts of the magnetic material can be more intuitively displayed in the C-scan distribution diagram; red is used to represent the part of the magnetic material where the magnetic field strength exceeds the set threshold, which can more prominently indicate abnormal magnetic field strength in the magnetic material, making it easier to promptly handle the magnetic material with abnormal magnetic field strength.

[0012] In a specific implementation scheme, the magnetic material magnetic field strength detection method of the present application also includes step S50: eliminating the magnetic material with unqualified magnetic field strength; in the step S40, when it is detected that the magnetic field strength of the magnetic material is unqualified, an unqualified prompt signal is given.

[0013] By adopting the above technical scheme, by eliminating magnetic materials with unqualified magnetic field strength, it can be ensured that the magnetic materials after the detection process are all magnetic materials with qualified magnetic field strength, thereby ensuring the quality of magnetic material products; by using the unqualified prompt signal given after detecting magnetic materials with unqualified magnetic field strength, it can intuitively reflect the detection of unqualified magnetic materials, making it convenient to grasp the unqualified situation of magnetic materials.

[0014] In a specific implementation scheme, in the step S50, the magnetic material with unqualified magnetic field strength is removed by delayed blowing.

[0015] By adopting the above technical solution, the delayed blowing method is used to remove products with unqualified magnetic field strength in magnetic materials, with a high removal accuracy rate and without affecting the transmission of other qualified magnetic materials.

[0016] The magnetic material magnetic field strength detection system provided in this application adopts the following technical solutions: A magnetic material magnetic field strength detection system includes a magnetic material transmission unit, a magnetic field strength detection unit, a detection signal processing unit and an unqualified magnetic material processing unit. The magnetic material transmission unit can transmit multiple magnetic materials in sequence. The magnetic field strength detection unit includes a Hall sensor array, and the Hall sensor array is arranged on the transmission path of the magnetic material. The detection signal processing unit is connected to the magnetic field strength detection unit so as to be able to process the detection signal of the Hall sensor array to obtain the magnetic field strength information of the magnetic material. The unqualified magnetic material processing unit is connected to the detection signal processing unit and can output processing information when the magnetic field strength of the magnetic material exceeds a set threshold, thereby realizing the magnetic material magnetic field strength detection method provided in the present application.

[0017] By adopting the above technical scheme, using a Hall sensor array composed of multiple Hall sensors, it is possible to more accurately detect the magnetic field strength of different parts in the magnetic material, improve the sensitivity of magnetic field strength detection at smaller local positions in the magnetic material, and facilitate locating the detection results of the magnetic field strength to different areas of the magnetic material, which helps to analyze the reasons for the unqualified magnetic field strength of the magnetic material; using a detection signal processing unit, it is possible to process the detection signals detected by multiple array-arranged Hall sensors and restore them to the magnetic field strength of different local positions of the magnetic material; using an unqualified magnetic material processing unit, it is possible to output processing information when the magnetic field strength of the magnetic material exceeds a set threshold, prompting the operator to process it, or controlling the processing mechanism to automatically process it to remove unqualified products in the magnetic material.

[0018] In a specific possible implementation manner, the Hall sensor array is a Hall sensor chip integrating a plurality of Hall sensors arranged in an array.

[0019] By adopting the above technical solution and utilizing a Hall sensor chip that integrates multiple Hall sensors arranged in an array, more Hall sensors can be arranged in a smaller area, thereby improving the detection resolution of the magnetic field strength in different areas of the magnetic material and the detection sensitivity of the magnetic field strength in smaller areas of the magnetic material.

[0020] In a specific feasible implementation scheme, the magnetic material conveying unit includes a conveying mounting platform, a vibrating conveyor and a linear conveying rail, the vibrating conveyor and the linear conveying rail are both arranged on the conveying mounting platform, and the linear conveying rail is arranged corresponding to the vibrating conveyor; the magnetic field strength detection unit also includes a detection mounting seat and a detection head, the detection mounting seat is fixedly connected to the conveying mounting platform, the detection head is fixed on the detection mounting seat, and the relative position of the detection head and the linear conveying rail can be adjusted through the detection mounting seat, and the Hall sensor array is arranged on the detection head, and is arranged directly opposite to the conveying path of the magnetic material.

[0021] By adopting the above technical scheme, using a linear conveyor rail connected to a vibrating conveyor, the magnetic material can be transported sequentially along a fixed path on the linear conveyor rail, which is convenient for batch testing of the magnetic material and improves the detection efficiency of the magnetic field strength of the magnetic material; by using a conveying mounting table to fix the detection mounting seat, the position of the detection head and the Hall sensor array arranged on the detection head can be easily adjusted, so that the Hall sensor array can face the magnetic material being transported and be closer to the material, which is conducive to improving the detection resolution of the magnetic field strength of different local areas in the magnetic material.

[0022] In a specific feasible implementation scheme, two detection heads and two Hall sensor arrays are provided, the two detection heads are fixed on the detection mounting base, and are respectively arranged on the upper and lower sides of the linear conveying rail, and the two Hall sensor arrays are respectively arranged at relative positions on the two detection heads.

[0023] By adopting the above technical solution, using two Hall sensor arrays respectively arranged on the upper and lower sides of the linear conveyor rail, the magnetic field strength of the magnetic material can be detected from the upper and lower sides of the magnetic material at the same time, thereby further improving the resolution of magnetic field strength detection in different local areas inside the magnetic material and the sensitivity of magnetic field strength detection in local tiny areas of the magnetic material.

[0024] In a specific feasible implementation scheme, the unqualified magnetic material processing unit includes an air blowing control valve and an air blowing rejection tube, the air blowing rejection tube is arranged behind the magnetic field strength detection unit on the linear conveying rail, and the air blowing port is located on the conveying path of the magnetic material, and the air blowing control valve is arranged on the air supply pipeline of the air blowing rejection tube.

[0025] By adopting the above technical scheme, an air blowing rejection tube whose air holes are located on the magnetic material transmission path of the linear conveyor rail can be used to conveniently reject the magnetic field that fails the magnetic field strength test transmitted on the linear conveyor rail, thereby ensuring that the magnetic materials output through the linear conveyor rail are all magnetic materials that pass the magnetic field strength test; an air blowing control valve arranged on the air supply pipeline of the air blowing rejection tube can be used to quickly and briefly open the air blowing control valve within a set delay time after detecting that the magnetic field strength of the magnetic material fails to meet the requirements, and gas is blown out when the magnetic material is transmitted from the position of the Hall sensor array on the linear conveyor rail to the position of the air blowing port, thereby rejecting the magnetic material that fails the test, thereby ensuring the accurate rejection of the unqualified magnetic material and reducing the impact on the surrounding qualified magnetic materials.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through multiple array-arranged Hall sensors, the magnetic field strength of the magnetic material is detected at different positions. The magnetic field strength detection signals of multiple different relative positions or magnetic materials can be analyzed to derive the magnetic field strength of multiple different local positions in the magnetic material, thereby detecting different magnetic field strengths at different local positions inside the magnetic material, and improving the detection sensitivity of the magnetic field strength of local small areas in the magnetic material; 2. Through the detection signal processing unit, the detection signals of multiple array-arranged Hall sensors are C-scanned and calibrated, and a C-scan distribution diagram reflecting the magnetic field strength of different local areas of the magnetic material can be obtained, which can intuitively reflect the magnetic field strength of different local areas of the magnetic material, and can indicate the specific position and range of the magnetic field strength in the magnetic material exceeding the set threshold, which is conducive to analyzing the reasons for the excessive magnetic field strength in the magnetic material production process and improving the product qualification rate of the magnetic material production; 3. By setting up an air-blowing rejection tube on the conveying path of the magnetic material, it is possible to delay blowing on the magnetic material for a certain period of time after detecting that the magnetic field strength of the magnetic material exceeds the set threshold, thereby ensuring that the unqualified magnetic material is rejected when it is conveyed to the position relative to the air-blowing rejection tube, making the rejection of unqualified magnetic materials more convenient and accurate, ensuring that the magnetic material after detection does not contain products with unqualified magnetic field strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a flowchart of an embodiment of a method for detecting magnetic field strength of magnetic materials of the present application.

[0028] Figure 2A schematic diagram of an embodiment of a magnetic material magnetic field strength detection system of the present application.

[0029] Figure 3 for Figure 2 A partial enlarged view of part A.

[0030] Figure 4 This is a control principle diagram of an embodiment of a magnetic material magnetic field strength detection system of the present application.

[0031] Figure 5 This is a schematic diagram of the adjacent structure of the air blowing rejection tube in one embodiment of the magnetic material magnetic field strength detection system of the present application.

[0032] Figure 6 This is a schematic diagram of a detection head in one embodiment of a magnetic material magnetic field strength detection system of the present application.

[0033] Figure 7 This is a schematic diagram of the detection interface in one embodiment of the magnetic material magnetic field strength detection system of the present application.

[0034] Explanation of the reference numerals: 1. Magnetic material conveying unit; 11. Conveying mounting platform; 12. Linear conveying rail; 2. Magnetic field strength detection unit; 21. Hall sensor array; 22. Detection mounting seat; 23. Detection head; 3. Detection signal processing unit; 4. Unqualified magnetic material processing unit; 41. Air blowing rejection tube; 5. Magnetic material. DETAILED DESCRIPTION

[0035] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0036] In this application, unless otherwise stated, the directions or positional relationships indicated by the directional words such as "front" and "rear" are based on the directions or positional relationships of the magnetic material flow when the magnetic material magnetic field strength detection system of this application is actually used. The description of the directions or positional relationships of the components of the magnetic material magnetic field strength detection system of this application is consistent with the directions in actual use.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] An embodiment of the magnetic material magnetic field strength detection method of the present application is as follows: Figure 1As shown, the following steps are included: S10: Allow the magnetic material to pass through a plurality of Hall sensors arranged in an array.

[0039] The magnetic material is usually placed in a vibration plate, and under the action of the vibration plate, it is transported in sequence along a certain path and passes through a magnetic field strength detection device. A plurality of Hall sensors are arranged in the magnetic field strength detection device, and the plurality of Hall sensors are arranged in multiple rows and columns at a certain interval. Usually, there are 8-128 Hall sensors, and the Hall sensors are arranged in different rows and columns according to the number of Hall sensors set. For example, when 40 Hall sensors are used, the Hall sensors are arranged in 5 rows × 8 columns. The array-like Hall sensors are arranged on the transmission path of the magnetic material, so that the magnetic material passes through the detection area of ​​the Hall sensor array in sequence.

[0040] S20: Acquire detection signals of multiple Hall sensors.

[0041] When the magnetic material passes through the Hall sensor array, multiple Hall sensors are used to simultaneously detect the magnetic field strength in the magnetic material. Specifically, an excitation current of a set magnitude is passed through the Hall sensor. When the magnetic material is magnetic, multiple Hall sensors will generate a Hall electromotive force corresponding to the magnetic field strength of the magnetic material. By obtaining the Hall electromotive force generated by multiple Hall sensors, the magnetic field strength in the magnetic material can be known.

[0042] S30: Processing detection signals detected by multiple Hall sensors to obtain magnetic field strengths at different locations of the magnetic material.

[0043] Since multiple Hall sensors are set at different relative positions around the magnetic material, the magnetic field strength detected by each Hall sensor is the result of the superposition of the local magnetic fields at different parts of the magnetic material in the corresponding direction. The local magnetic field strength at different parts of the magnetic material can be calculated through the coordinates of multiple Hall sensors and the magnetic field strength detected at the corresponding coordinate points.

[0044] The existing method of using Hall sensors to detect the magnetic field strength of magnetic materials usually sets a Hall sensor on the conveying path of the magnetic material. The Hall sensor detects the overall magnetic field strength of the magnetic material, that is, the superposition of the local magnetic field strengths of the magnetic material. The magnetic field strength detected in this way cannot represent the distribution of the magnetic field strength inside the magnetic material. For example, if only one local magnetic field strength in a magnetic material is high, exceeding the design requirements, while the magnetic field strengths of other local areas are very low, the magnetic field strength detected by the Hall sensor may not be high; while each local area in another magnetic material has a certain magnetic field strength, and the magnetic field strength of each local area is within the design requirements, the magnetic field strength detected by the Hall sensor may be higher. Therefore, the traditional method of using Hall sensors to detect the magnetic field strength of magnetic materials cannot accurately detect the abnormality of the magnetic field strength of the magnetic material. However, by using the magnetic material magnetic field strength detection method of the present application, it is possible to accurately detect the magnetic field strength of each local area of ​​the magnetic material, thereby improving the sensitivity and accuracy of the detection of the local magnetic field strength of the magnetic material.

[0045] S40: Compare the magnetic field strength of each part of the magnetic material with the set magnetic field strength threshold. If the magnetic field strength is greater than the set threshold, it is determined that the magnetic field strength of the magnetic material is unqualified.

[0046] The magnetic field strengths of different parts of the magnetic material detected are compared one by one with the pre-set magnetic field strength threshold. As long as there is a local magnetic field strength greater than the set magnetic field strength threshold, it means that an abnormal magnetic field strength area appears in the magnetic material, and the magnetic field strength of the magnetic material is judged to be unqualified.

[0047] Compared with the traditional method of only detecting the overall magnetic field strength of the magnetic material, the method of the present application can detect up to 3000 local magnetic field strength values ​​in a magnetic material less than 20 mm long by setting 8-128 Hall sensors arranged in an array. The detection sensitivity and detection accuracy of the local magnetic field strength are higher, and the abnormal magnetic field strength of the local area can be more detected, which effectively improves the accuracy of the magnetic field strength detection results of the magnetic material.

[0048] In some embodiments of the magnetic material magnetic field strength detection method of the present application, such as Figure 1 As shown, the magnetic material magnetic field strength detection method of the present application also includes the steps of: S35: Perform C-scan calibration according to the positions of the multiple Hall sensors and the detection signals of the multiple Hall sensors to obtain a C-scan distribution diagram of the magnetic material.

[0049] Multiple array-arranged Hall sensors detect the magnetic field strength formed by the superposition of multiple different local magnetic material strengths in the magnetic material according to the weights of distance and orientation from different relative positions and along different directions. According to the position coordinates of each Hall sensor and the magnetic field strength detected by it, a C-scan distribution map representing the magnetic field strength at different parts of the magnetic material can be obtained through the C-scan calibration method. The specific steps of C-scan calibration and the specific method of obtaining the C-scan distribution map are prior arts in the relevant technical field and have been widely used in the field of ultrasonic imaging. The present application uses this method to process the magnetic field strength detected by multiple array-arranged Hall sensors to obtain a two-dimensional C-scan distribution map that can intuitively reflect the local magnetic field strength at different parts of the magnetic material.

[0050] Compared with the traditional method of detecting the magnetic field strength of magnetic materials, the C-scan distribution diagram of the magnetic field strength can form a one-to-one correspondence between the magnetic field strength of different parts of the magnetic material and the local position coordinates. Therefore, the magnetic field strength distribution in the magnetic material can be intuitively known through the C-scan distribution diagram, and the position and area size of different magnetic field strengths in the magnetic material can be intuitively understood, which is conducive to analyzing the causes of the formation of local high magnetic field strength and quality control methods.

[0051] In a preferred embodiment of the magnetic material magnetic field strength detection method of the present application, as Figure 1 As shown, in step S35, different grayscale colors are used in the C-scan distribution diagram to represent different magnetic field strengths of the magnetic material. The higher the local magnetic field strength, the darker the grayscale color of the corresponding position. The user can know the position distribution of the area with higher magnetic field strength in the magnetic material through the position distribution of the dark color in the C-scan distribution diagram.

[0052] For some areas in the magnetic material where the magnetic field strength exceeds the set threshold, red is used to indicate it in the C-scan distribution diagram. Using red to indicate the area where the magnetic field strength exceeds the set threshold in the magnetic material can clearly indicate the existence of the area where the magnetic field strength exceeds the standard and can clearly show the location of the area where the magnetic field strength exceeds the standard.

[0053] In some embodiments of the magnetic material magnetic field strength detection method of the present application, such as Figure 1 As shown, the magnetic material magnetic field strength detection method of the present application also includes the steps of: S50: Discarding the magnetic materials with unqualified magnetic field strength.

[0054] The magnetic materials with unqualified magnetic field strength can be removed by pausing the transmission of the magnetic materials and prompting the operator to remove them manually, or by setting a pushing device on the conveying path of the magnetic materials, or by setting a controllable trap to automatically remove them. By removing the magnetic materials with unqualified magnetic field strength on the conveying path, it can be ensured that the magnetic materials conveyed out are qualified products that have passed the magnetic field strength test, thereby ensuring the quality of the magnetic materials conveyed out.

[0055] In step S40, when the magnetic field strength of each local position in the detected magnetic material is compared with the set magnetic field strength detection threshold, once it is found that the local magnetic field strength exceeds the detection threshold, that is, it is found that the magnetic field strength of the magnetic material is unqualified, an unqualified prompt signal is given. The unqualified prompt signal can be a sound or light prompt, or a graphic prompt displayed on the monitoring screen. The unqualified prompt signal can remind the on-site operator to pay attention to the unqualified information, and it is also convenient for the operator to understand the overall unqualified situation of the magnetic material, and manual intervention is necessary.

[0056] In a preferred embodiment of the magnetic material magnetic field strength detection method of the present application, in step S50, an air blowing device is arranged on the conveying path behind the Hall sensor array, and a set time is delayed after the Hall sensor detects that the magnetic field strength of the magnetic material is unqualified. When the unqualified magnetic material is conveyed to a position opposite to the air blowing device, the air blowing device is controlled to blow a short air flow to blow the unqualified magnetic material out of the conveying track, thereby removing the magnetic material with unqualified magnetic field strength on the conveying path.

[0057] By delaying the air blowing method to remove unqualified magnetic materials, unqualified magnetic materials on the conveying path can be accurately removed, avoiding the influence of the removal action on the surrounding qualified magnetic materials, and preventing the magnetic material removal device from interfering with the Hall sensor.

[0058] An embodiment of the magnetic material magnetic field strength detection system of the present application is as follows: Figures 2 to 6 As shown, it includes a magnetic material transmission unit 1, a magnetic field strength detection unit 2, a detection signal processing unit 3 and an unqualified magnetic material processing unit 4. The magnetic material transmission unit 1 can use various suitable structural units that can realize one-to-one sequential transmission of magnetic materials, such as a structural unit composed of a magnetic material distribution structure and a conveyor belt, through which a plurality of magnetic materials 5 are distributed one by one to the conveyor belt by the distribution structure, and are sequentially transmitted on the conveyor belt; or a structural unit composed of a vibrating conveyor plate and a linear conveyor track, through which a plurality of magnetic materials are pushed one by one to the linear conveyor track by the vibrating conveyor plate, and are sequentially transmitted on the linear conveyor track.

[0059] The magnetic field strength detection unit 2 is provided with a Hall sensor array 21, in which a plurality of Hall sensors arranged in an array are arranged. The magnetic field strength detection unit 2 is arranged on the magnetic material transmission path of the magnetic material transmission unit 1, so that the Hall sensor array 21 is located near the magnetic material transmission path. In this way, the magnetic material 5 transmitted on the magnetic material transmission path will sequentially pass through the adjacent position directly facing the Hall sensor array 21, and the magnetic field strength of the magnetic material 5 is detected at close range.

[0060] The detection signal processing unit 3 is electrically connected to the magnetic field strength detection unit 2. The detection signal of the Hall sensor array 21 in the magnetic field strength detection unit 2 is transmitted to the detection signal processing unit 3. The detection signal processing unit 3 processes the detection signals of different Hall sensors in the Hall sensor array 21 to parse out the magnetic field strength at different local positions in the magnetic material 5. The detection signal processing unit 3 can use a specially set microprocessor unit, or a home computer or an industrial computer.

[0061] The unqualified magnetic material processing unit 4 is electrically connected to the detection signal processing unit 3, and is used to compare the magnetic field strength of different parts of the magnetic material 5 analyzed by the detection signal processing unit 3 with the set magnetic field strength threshold. When the magnetic field strength of any local area exceeds the magnetic field strength threshold, it means that the magnetic field strength detection result of the detected magnetic material 5 is unqualified. At this time, the unqualified magnetic material processing unit 4 outputs processing information to prompt the operator, or controls the corresponding processing facilities to process the unqualified magnetic material 5.

[0062] In the magnetic material magnetic field strength detection system of the present application, a controller may also be provided, through which the coordination of the magnetic material transmission unit 1, the magnetic field strength detection unit 2, the detection signal processing unit 3 and the unqualified magnetic material processing unit 4 is controlled. A touch screen connected to the controller may also be provided, through which a set magnetic field strength threshold may be input into the unqualified magnetic material processing unit 4, so that the detection requirements for the magnetic field strength of the magnetic material 5 may be adjusted according to design requirements. Figure 7 As shown, the detection interface of the magnetic material magnetic field strength detection system of the present application can also be displayed through the touch screen, and the working parameters of the detection system can be displayed in the detection interface. A detection result display area that can display the magnetic field strength detection result is also provided in the detection interface, including a magnetic field strength scanning area, in which a magnetic field strength curve representing the magnetic field strength of different parts of the magnetic material 5 can be displayed, and a threshold straight line representing the magnetic field strength threshold is displayed on both sides of the magnetic field strength curve. When the magnetic field strength curve exceeds the threshold straight line, it indicates that the magnetic field strength of the magnetic material 5 is unqualified; it also includes a C-scan distribution diagram display area, in which the C-scan distribution diagram of the magnetic material 5 is displayed, and gray of different depths is used to represent the magnetic field strength of different areas of the magnetic material 5. Red represents that the magnetic field strength of the area exceeds the threshold, indicating that the magnetic field strength of the magnetic material 5 is unqualified.

[0063] The magnetic material magnetic field strength detection system of the present application can be used to implement the magnetic material magnetic field strength detection method of any embodiment of the present application.

[0064] In some embodiments of the magnetic material magnetic field strength detection system of the present application, such as Figure 6As shown, the Hall sensor array 21 uses a Hall sensor chip, on which a plurality of Hall sensors arranged in an array are integrated, such as 5 rows × 8 columns with a total of 40 Hall chip sensors. The arrangement of integrating a plurality of Hall sensors arranged in an array on the same Hall sensor chip can greatly increase the device density of the Hall sensor, so that a plurality of Hall sensors are concentrated within a range adapted to the width of the magnetic material 5, thereby improving the effect of detecting the magnetic field strength of the magnetic material 5. For example, in order to detect a magnetic material 5 with a width of about 5 mm, in this embodiment, 5 rows × 8 columns with a total of 40 Hall chip sensors are integrated within a range of a row width of 5 mm and a column width of 3 mm. This arrangement density cannot be achieved by arranging a plurality of independent Hall sensors in parallel. The Hall sensor chip has been successfully manufactured by the inventor on behalf of a Hall chip manufacturer.

[0065] In a preferred embodiment of the magnetic material magnetic field strength detection system of the present application, as Figure 2 and Figure 3 As shown, the magnetic material conveying unit 1 includes a conveying installation platform 11, a vibrating conveyor (not shown in the figure) and a linear conveyor rail 12. The conveying installation platform 11 is a setting platform for other structures in the magnetic material conveying unit 1 and the magnetic field strength detection unit 2. A detection system for detecting other detection indicators of the magnetic material 5 can also be set on the conveying installation platform 11, such as a detection system for detecting the appearance, shape and size of the magnetic material 5. The vibrating conveyor can use a commercially available disc vibrating conveyor, and the vibrating conveyor is set on the conveying installation platform 11. The linear conveyor rail 12 is set on the conveying installation platform 11, and one end of the linear conveyor rail 12 is arranged opposite to the discharge port of the vibrating conveyor, so that after the magnetic material 5 is output through the discharge port of the vibrating conveyor, it can be sequentially conveyed to the linear conveyor rail 12 and sequentially conveyed forward on the linear conveyor rail 12.

[0066] The magnetic field strength detection unit 2 includes a Hall sensor array 21, a detection mounting seat 22 and a detection head 23. The detection mounting seat 22 is fixed on the conveying mounting platform 11 through a mounting frame. The detection mounting seat 22 is provided with a detection head mounting plate and two position adjustment knobs in mutually perpendicular directions. The two position adjustment knobs can be used to adjust the position of the detection head mounting plate in two mutually perpendicular dimensions of the detection mounting seat 22. The mounting portion at one end of the detection head 23 is fixed on the detection mounting seat 22, and the measuring claw at the other end extends to the vicinity of the linear conveyor rail 12. The Hall sensor array 21 is arranged on the measuring claw of the detection head 23, and is arranged opposite to the conveying path of the magnetic material 5 on the linear conveyor rail 12. The two position adjustment knobs on the detection mounting seat 22 can adjust the distance and relative position between the Hall sensor array 21 and the magnetic material 5 conveyed on the linear conveyor rail 12, thereby forming a better detection effect on the magnetic field strength of the magnetic material 5.

[0067] As a specific implementation of the magnetic material magnetic field strength detection system of the present application, Figure 2 , 3 As shown in Figures 5 and 6, two detection heads 23 and two Hall sensor arrays 21 are provided, and the two Hall sensor arrays 21 are respectively provided at relative positions on the two detection heads 23. One detection mounting seat 22 can be provided, or two detection heads 23 can be provided; the two detection heads 23 can be fixed on the same detection mounting seat 22, or they can be fixed on corresponding detection mounting seats 22 respectively. The measuring claws of the two detection heads 23 extend to the upper and lower sides of the linear conveyor rail 12 respectively, so that the two Hall sensor arrays 21 are respectively located on the upper and lower sides of the magnetic material 5 transported on the linear conveyor rail 12, and the magnetic field strength of multiple local positions in the magnetic material 5 is respectively detected from the upper and lower sides of the magnetic material 5.

[0068] In some embodiments of the magnetic material magnetic field strength detection system of the present application, such as Figure 5 As shown, the unqualified magnetic material processing unit 4 includes an air blowing control valve (not shown in the figure) and an air blowing rejection tube 41. The air blowing rejection tube 41 is connected to an external high-pressure air source and is connected to the rear position of the magnetic field strength detection unit 2 on the linear conveyor rail 12. The air blowing port of the air blowing rejection tube 41 is located on the conveying path of the magnetic material 5. The air blowing control valve is arranged on the air supply pipeline connecting the air blowing rejection tube 41 and the external air source, and is connected to the controller of the system. When the magnetic field strength of the magnetic material 5 detected by the magnetic field strength detection unit 2 is unqualified, the controller controls the air blowing control valve to open briefly after the delay setting time. During the delay time, the unqualified magnetic material 5 is just transferred from the corresponding position of the Hall sensor array 21 on the linear conveyor rail 12 to the corresponding position of the air blowing port of the air blowing rejection tube 41, and the unqualified magnetic material 5 is blown off from the linear conveyor rail 12 by the high-pressure airflow blown out by the air blowing hole, and falls into the unqualified product collection container below the linear conveyor rail 12.

[0069] The specific air blowing delay time is determined by the conveying speed of the magnetic material 5 and the distance between the Hall sensor array 21 on the linear conveyor rail 12 and the air blowing outlet of the air blowing rejection tube 41. The setting of the air blowing delay time can be automatically generated by the controller in combination with the parameters of the vibration conveyor, or can be manually input into the controller through the touch screen according to the test results. By setting the delay time, the air blowing rejection tube 41 can be set at a certain distance from the Hall sensor array 21, reducing the influence of the rejection of unqualified magnetic materials 5 on the magnetic field strength detection.

[0070] In the description of the present application, the description with reference to the terms "one embodiment", "specific embodiment", "preferred embodiment", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0071] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for detecting magnetic field strength of a magnetic material, characterized in that: The steps include: S10: allowing the magnetic material to pass through a plurality of Hall sensors arranged in an array; S20: Acquire a plurality of Hall sensor detection signals; S30: Processing detection signals of the plurality of Hall sensors to obtain magnetic field strengths at different locations of the magnetic material; S40: Compare the magnetic field strength of each part of the magnetic material with the set magnetic field strength threshold. If the magnetic field strength is greater than the set threshold, it is determined that the magnetic field strength of the magnetic material is unqualified.

2. The method according to claim 1, characterized in that: The method further includes step S35: performing C-scan calibration according to the positions of the plurality of Hall sensors and the electrical signals detected by the plurality of Hall sensors to obtain a C-scan distribution diagram of the magnetic material.

3. The method according to claim 2, characterized in that: In step S35, different grayscale colors are used in the C-scan distribution diagram to represent different magnetic field strengths of the magnetic material. The higher the magnetic field strength, the darker the grayscale color. The portion of the magnetic material where the magnetic field strength exceeds the set threshold is represented by red in the C-scan distribution diagram.

4. The method according to claim 1, characterized in that: The method further comprises step S50: removing the magnetic material with unqualified magnetic field strength; in step S40, when it is detected that the magnetic field strength of the magnetic material is unqualified, giving an unqualified prompt signal.

5. The method according to claim 4, characterized in that: In the step S50, the magnetic material with unqualified magnetic field strength is removed by delayed blowing.

6. A magnetic material magnetic field strength detection system, characterized in that: The invention comprises a magnetic material transmission unit (1), a magnetic field strength detection unit (2), a detection signal processing unit (3) and an unqualified magnetic material processing unit (4), wherein the magnetic material transmission unit (1) is capable of sequentially transmitting a plurality of magnetic materials (5), the magnetic field strength detection unit (2) comprises a Hall sensor array (21), and the Hall sensor array is arranged on the transmission path of the magnetic material (5), the detection signal processing unit (3) is connected to the magnetic field strength detection unit (2) so as to be able to process the detection signal of the Hall sensor array (21) to obtain the magnetic field strength information of the magnetic material (5), and the unqualified magnetic material processing unit (4) is connected to the detection signal processing unit (3) so as to be able to output the processing information when the magnetic field strength of the magnetic material (5) exceeds a set threshold, thereby realizing the magnetic field strength detection method of magnetic materials according to any one of claims 1 to 5.

7. The magnetic material magnetic field strength detection system according to claim 6, characterized in that: The Hall sensor array (21) is a Hall sensor chip that integrates a plurality of Hall sensors arranged in an array.

8. The magnetic material magnetic field strength detection system according to claim 6, characterized in that: The magnetic material conveying unit (1) comprises a conveying mounting platform (11), a vibrating conveyor and a linear conveying rail (12), wherein the vibrating conveyor and the linear conveying rail (12) are both arranged on the conveying mounting platform (11), and the linear conveying rail (12) is arranged corresponding to the vibrating conveyor; the magnetic field strength detection unit (2) further comprises a detection mounting seat (22) and a detection head (23), wherein the detection mounting seat (22) is fixedly connected to the conveying mounting platform (11), the detection head (23) is fixed on the detection mounting seat (22), and the relative position of the detection head (23) and the linear conveying rail (12) can be adjusted by the detection mounting seat (22), and the Hall sensor array (21) is arranged on the detection head (23) and is arranged directly opposite to the conveying path of the magnetic material (5).

9. The magnetic material magnetic field strength detection system according to claim 8, characterized in that: Two detection heads (23) and two Hall sensor arrays (21) are provided, and the two detection heads (23) are fixed on the detection mounting seat (22) and are respectively arranged on the upper and lower sides of the linear conveying rail (12), and the two Hall sensor arrays (21) are respectively arranged at relative positions on the two detection heads (23).

10. The magnetic material magnetic field strength detection system according to any one of claims 7 to 9, characterized in that: The unqualified magnetic material processing unit (4) comprises an air blowing control valve and an air blowing rejection pipe (41); the air blowing rejection pipe (41) is arranged behind the magnetic field strength detection unit (2) on the linear conveying rail (12), and the air blowing port is located on the conveying path of the magnetic material (5); the air blowing control valve is arranged on the air supply pipeline of the air blowing rejection pipe (41).

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