A magnetization direction detection device

Abstract

This application relates to a magnetization direction detection device. The device includes: a feeding mechanism; a conveyor belt on which the magnet to be tested is transported; and a detection magnet, including a first detection magnet disposed on one side of the conveyor belt, with its two poles located on the side closer to and further away from the conveyor belt, respectively. The magnetization direction detection device of this application has high detection efficiency, high accuracy, and no missed or incorrect detections. The detected magnet does not carry a weak magnetism, thus not affecting subsequent use.

Description

Technical Field

[0001] The present application relates to the field of magnetic material preparation and detection, and in particular to a magnetization direction detection device. Background Art

[0002] The magnetization direction is one of the important characteristics of magnetic materials, especially permanent magnets. However, in the mass production process of magnets, some magnets may have their magnetization direction inconsistent with the design direction due to factors such as pressing and machining. For example, if the magnetization direction is perpendicular to the design direction, the magnetic field generated after magnetization will not meet the design requirements and will be a defective product. In particular, in some applications, magnets need to be formed into assemblies. They are usually not magnetized when leaving the factory to facilitate subsequent assembly. They are magnetized after assembly. If the defective products cannot be picked out before the magnets are formed into assemblies, the assemblies will not be used normally, resulting in certain economic losses.

[0003] In the factory inspection link, qualified products and unqualified products cannot be distinguished from the appearance, and corresponding inspection devices need to be added. In order to screen out unqualified products from qualified products, patent CN205308812 discloses a magnetic pole identification instrument, which uses the principle of electromagnetic induction. When in use, a magnetic field is generated by a magnetic field generator. When the magnetic pole is abnormal, the sensor obtains a signal to control the processor to slow down the conveyor belt and use an ejection device to eject the unqualified magnet. This device needs to measure the magnetic field near the magnet, and when the magnet moves, the measurement result of the magnetic field is inaccurate, which is prone to misjudgment, and the measurement efficiency of this method is not high. Summary of the invention

[0004] Based on this, the present application provides a magnetization direction detection device to achieve accurate and efficient detection of the magnetization direction of a magnet.

[0005] The present application provides a magnetization direction detection device, comprising: a feeding mechanism; a conveyor belt, wherein the feeding mechanism transports a magnet to be tested to the conveyor belt; a detection magnet, comprising a first detection magnet, wherein the detection magnet is arranged on one side of the conveyor belt, and the two poles of the first detection magnet are respectively located on a side of the first detection magnet close to the conveyor belt and a side away from the conveyor belt.

[0006] According to some embodiments of the present application, the detection magnet includes a second detection magnet, the two poles of the second detection magnet are respectively located on the side of the second detection magnet close to the conveyor belt and the side away from the conveyor belt, the second detection magnet is arranged side by side with the first detection magnet, the polarity of the magnetic pole of the second detection magnet close to the conveyor belt is opposite to the polarity of the magnetic pole of the first detection magnet close to the conveyor belt, and the second detection magnet is arranged side by side with the first detection magnet.

[0007] According to some embodiments of the present application, the first detection magnet and the second detection magnet are spaced 40-60 mm apart.

[0008] According to some embodiments of the present application, the conveyor belt is arranged at an angle, and a side of the conveyor belt away from the detection magnet is higher than a side close to the detection magnet.

[0009] According to some embodiments of the present application, an angle adjustment mechanism is provided below a side of the conveyor belt away from the detection magnet, and the angle adjustment mechanism comprises a lifting rod, one end of which supports the conveyor belt.

[0010] According to some embodiments of the present application, the angle adjustment mechanism further includes an angle scale, and the angle scale is used to display the inclination angle of the conveyor belt.

[0011] According to some embodiments of the present application, the magnetization direction detection device also includes a frame, and the loading mechanism, conveyor belt and detection magnet are all arranged on the frame.

[0012] According to some embodiments of the present application, the magnetization direction detection device further includes a baffle for adjusting the vertical distance between the magnet to be detected and the detection magnet.

[0013] According to some embodiments of the present application, the magnetization direction detection device further includes a material receiving box, and the material receiving box is arranged below the discharge end of the conveyor belt.

[0014] According to some embodiments of the present application, a buffer plate is provided between the discharge end of the conveyor belt and the material receiving box.

[0015] In the solution of the present application, when the conveyor belt transports the magnets to be tested through the detection magnet, the unqualified magnets to be tested whose magnetization direction is inconsistent with the design direction will be attracted by the detection magnet and thus be attracted to the detection magnet, and the qualified magnets will continue to be transported by the conveyor belt, thereby sorting the qualified magnets from the unqualified magnets. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without exceeding the scope of protection required by the present application.

[0017] Figure 1 is a schematic diagram of a detection device according to an embodiment of the present application;

[0018] Figure 2 is a schematic diagram of the magnetization direction of the magnet to be tested in the embodiment of the present application;

[0019] Figure 3a is a schematic diagram of a detection magnet in an embodiment of the present application;

[0020] Figure 3b is a schematic diagram of another detection magnet in an embodiment of the present application;

[0021] Figure 4 is a schematic diagram of a detection magnet attracting an unqualified magnet according to an embodiment of the present application;

[0022] Figure 5 is a schematic diagram of the magnetic field of a magnet to be tested passing through a detection magnet in an embodiment of the present application;

[0023] Figure 6 It is a schematic diagram of flipping a failed magnet in an embodiment of the present application;

[0024] Figure 7 is an enlarged view of the angle adjustment mechanism of the embodiment of the present application;

[0025] Figure 8 is an enlarged view of the baffle of the embodiment of the present application;

[0026] Fig. 9 Schematic diagram of the vertical distance between the magnet to be tested and the detection magnet in the embodiment of the present application;

[0027] Fig.10 is a schematic diagram of an inclined arrangement of a magnet to be tested in an embodiment of the present application;

[0028] Fig.11 It is a flow chart of the magnetization direction detection method according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] The technical solution of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0030] like Figure 1 As shown, an embodiment of the present application provides a magnetization direction detection device. The magnetization direction detection device includes a feeding mechanism 1, a conveyor belt 2 and a detection magnet 3. The magnetization direction detection device can efficiently select defective products whose magnetization direction is inconsistent with the design direction. Figure 1 The arrow in FIG. 2 indicates the running direction of the conveyor belt 2 .

[0031] The feeding mechanism 1 is used to convey the magnets to be tested onto the conveyor belt 2. Optionally, in this embodiment, the feeding mechanism 1 is a vibration plate, which is arranged at the feeding end of the conveyor belt 2. The vibration plate conveys the magnets to be tested that are not magnetized to the conveyor belt 2 in a certain posture, ensuring that all the magnets to be tested are placed in the same posture when they are moved onto the conveyor belt 2.

[0032] like Figure 2 As shown, when the magnet to be tested moves onto the conveyor belt 2, the magnetization direction of magnet C1 is the normal direction of the conveyor belt plane, the magnetization direction of magnet C2 is the conveying direction perpendicular to the conveyor belt 2 in the conveyor belt plane, and the magnetization direction of magnet C3 is parallel to the conveying direction of the conveyor belt 2. In this embodiment, the posture of the magnet to be tested when it moves onto the conveyor belt 2 should ensure that the magnetization direction of the qualified magnet is the normal direction of the conveyor belt plane, that is, C1 is a qualified magnet, and the magnetization directions of the unqualified magnet are the other two directions. C1, C2 and C3 magnets to be tested are all in a non-magnetic state before the start of the test.

[0033] The conveyor belt 2 is used to convey the magnet to be measured. The magnet to be measured falls on the feeding end of the conveyor belt 2 and is driven by the conveyor belt 2 to move toward the discharging end of the conveyor belt 2 .

[0034] Optionally, the material of the conveyor belt 2 can be selected according to the needs. The friction coefficient between the conveyor belt 2 of different materials and the magnet to be tested is different, and the difficulty of attracting the unqualified magnet is different. When the magnet to be tested is of different sizes or magnetic properties, different materials can be selected according to the friction coefficient, such as PVC material or rubber material. The friction coefficient between the PVC conveyor belt and the magnet is about 0.5, and the friction coefficient between the rubber conveyor belt and the magnet is about 0.9.

[0035] like Figure 3a As shown, the detection magnet 3 is arranged at one side of the conveyor belt 2. The detection magnet 3 includes a first detection magnet 31. The two poles of the first detection magnet 31 are respectively located at a side of the first detection magnet 31 close to the conveyor belt 2 and a side away from the conveyor belt 2.

[0036] like Figure 4 As shown, unqualified magnets on the conveyor belt will be attracted by the detection magnet 3, and qualified magnets will continue to be transported by the conveyor belt 2, so that qualified magnets and unqualified magnets are separated.

[0037] like Fig. 9 As shown, when the magnets to be measured pass through the magnetic field of the detection magnet 3, the vertical distance D between all the magnets to be measured and the detection magnet 3 should be the same, so that the magnetic field to which the magnets to be measured are subjected remains consistent.

[0038] In this embodiment, the S pole of the first detection magnet 31 is located on the side 311 close to the conveyor belt 2, and the N pole is located on the side away from the conveyor belt 2. The magnetic field of the detection magnet 3 extends to the conveyor belt 2. When the conveyor belt 2 transports the unmagnetized magnet to be tested through the magnetic field area of ​​the detection magnet 3, the magnet to be tested will first undergo a magnetization process, and the magnet to be tested will be magnetized along the magnetization direction inside and become a magnetized magnet. In this way, a magnetic attraction will be generated between the magnetized magnet to be tested and the detection magnet 3. At the same time, due to the static friction between the magnet to be tested and the conveyor belt, when the magnetic attraction is less than the static friction or the two are equal, the magnet to be tested will not move on the conveyor belt, that is, the magnet to be tested will not be attracted by the magnetic attraction of the detection magnet 3 to move, and will not be adsorbed to the surface of the detection magnet 3; when the magnetic attraction is greater than the static friction, the magnet to be tested will move, and then be adsorbed to the surface by the detection magnet 3.

[0039] like Figure 5 As shown, the magnet C1 to be tested is in a non-magnetic state before the start of the test, and its magnetization direction is perpendicular to the plane of the conveyor belt, which is the same as the design direction, and is a qualified product. After approaching the first detection magnet 31, the magnetic field of the first detection magnet 31 magnetizes and magnetizes the magnet C1 along the magnetization direction, and the magnetized C1 and the first detection magnet 31 generate a magnetic attraction. The attraction between the two is not along the horizontal plane of the conveyor belt but along its vertical plane, so that the suction along the horizontal plane is small, which is much smaller than the static friction between the conveyor belt 2 and the magnet C1. Therefore, the magnet C1 will not be attracted by the first detection magnet 31, and will then be smoothly transported out of the magnetic field range of the detection magnet 3 by the conveyor belt 2.

[0040] Before the detection begins, the magnet C2 is in a non-magnetic state, and its magnetization direction is perpendicular to the conveying direction of the conveyor belt 2 in the conveyor belt plane. When the magnet C2 passes through the magnetic field of the first detection magnet 31, the magnet C2 will be magnetized by the first detection magnet 31 along the magnetization direction. The magnetized magnet C2 is subjected to a larger magnetic force by the first detection magnet 31. When the magnetic force is greater than the static friction between the magnet C2 and the conveyor belt 2, the magnet C2 is attracted to the first detection magnet 31.

[0041] like Figure 6 As shown, when magnet C3 passes through the magnetic field of the first detection magnet 31, magnet C3 will also be magnetized by the first detection magnet 31. The magnetized magnet C3 will flip under the action of the magnetic force, flip a certain angle at position C3-1, and flip another certain angle at position C3-2. After flipping, it will be attracted to the first detection magnet 31 again.

[0042] However, since the magnetic field strength of the first detection magnet 31 cannot be too large, a too large magnetic field strength will magnetize all qualified products and attract them to the first detection magnet 31. Therefore, the magnetic field strength of the first detection magnet 31 is set to enable the magnet C3 to turn over smoothly, but since the conveyor belt 2 has a certain movement speed, when the magnet C3 is attracted to the first detection magnet 31, some of it may be missed, that is, the magnet C3 is not attracted by the first detection magnet 31 smoothly.

[0043] According to an optional technical solution of this application, Figure 3b , the detection magnet 3 also includes a second detection magnet 32. The first detection magnet 31 and the second detection magnet 32 ​​are arranged side by side along the conveying direction of the conveyor belt 2, and a certain distance is spaced between the first detection magnet 31 and the second detection magnet 32. In this embodiment, the first detection magnet 31 and the second detection magnet 32 ​​are spaced 40-60 mm apart. The magnetic field strength at the position where the magnet to be tested is subjected to the maximum force in the magnetic field of the second detection magnet 32 ​​is the same as the magnetic field strength at the position where the magnet to be tested is subjected to the maximum force in the magnetic field of the first detection magnet 31, and the magnetic pole direction of the second detection magnet 32 ​​is opposite to that of the first detection magnet 31, that is, the magnetic field direction of the second detection magnet 32 ​​is opposite to that of the first detection magnet 31. For example, the side 311 of the first detection magnet 31 close to the conveyor belt is the S pole, and the side 321 of the second detection magnet 32 ​​close to the conveyor belt is the N pole.

[0044] The second detection magnet 32 ​​is set, and the first detection magnet 31 and the second detection magnet 32 ​​are spaced a certain distance apart. The magnetic fields of the first detection magnet 31 and the second detection magnet 32 ​​are superimposed, so that the magnetic field strength at the C3-3 position between the first detection magnet 31 and the second detection magnet 32 ​​is increased. The magnet C3 that is omitted at the C3-2 position is attracted to the first detection magnet 31 at the C3-3 position. Compared with only setting the first detection magnet 31, adding the second detection magnet 32 ​​can avoid the omission of unqualified magnets and further improve the accuracy of detection.

[0045] After the qualified magnet passes through the magnetic field of the first detection magnet 31 through the transmission of the conveyor belt 2, the qualified magnet will have a weak magnetism (residual magnetic field). Since the magnetic field of the second detection magnet 32 ​​is opposite to the magnetic field of the first detection magnet 31, when the qualified magnet passes through the magnetic field of the first detection magnet 31 so that it has a weak magnetism in a certain direction, and then passes through the reverse magnetic field generated by the second detection magnet 32, the weak magnetism of the qualified magnet can be demagnetized and it has no magnetism.

[0046] As can be seen from the above, when the detection device of the present application is used to detect the magnet to be tested, the detection efficiency is high, and the unqualified magnet can be quickly attracted to the detection magnet 3, so as to achieve the rapid separation of qualified magnets from unqualified magnets. Optionally, if the detection magnet 3 includes a first detection magnet 31 and a second detection magnet 32 ​​with opposite magnetic field directions, the detection accuracy can be improved while the weak magnetism of the qualified magnet can be avoided.

[0047] According to an optional technical solution of the present application, the detection device may further include a frame 4, see Figure 1 The feeding mechanism 1 and the conveyor belt 2 are both arranged on the frame 4. The detection magnet 3 further includes a bracket, which supports the first detection magnet 31 and the second detection magnet 32. The bracket of the detection magnet 3 is arranged on the frame 4.

[0048] like Figure 7 As shown, in order to make it easier to attract unqualified magnets, the conveyor belt 2 can be tilted, and the side of the conveyor belt 2 away from the detection magnet is higher than the side close to the detection magnet. On the tilted conveyor belt 2, the magnetic force required for the detection magnet 3 to attract unqualified magnets can be reduced, making the unqualified magnets more sensitive when attracted, so as to improve the detection accuracy and detection efficiency. In this embodiment, the angle between the inclined surface of the conveyor belt 2 and the horizontal plane is 15°. Those skilled in the art can understand that the tilt angle of the conveyor belt 2 can be set according to requirements, such as the size of the friction to be overcome.

[0049] Optionally, an angle adjustment mechanism 5 may be provided below the side of the conveyor belt 2 away from the detection magnet. The angle adjustment mechanism 5 includes a lifting rod 51. The lifting rod 51 of this embodiment is a threaded lifting rod. One end of the lifting rod 51 supports the conveyor belt 2, and the other end is provided on the frame 4. By lifting and lowering the lifting rod 51, the side of the conveyor belt 2 away from the detection magnet can be driven to rise and fall, thereby realizing the adjustment of the inclination angle of the conveyor belt 2.

[0050] Furthermore, the angle adjustment mechanism 5 may further include an angle scale 52. One end of the angle scale 52 may be connected to the conveyor belt 2, and the other end is disposed on the frame 4. The angle scale 52 is mainly used to display the inclination angle of the conveyor belt 2, so that the operator can adjust the inclination angle of the conveyor belt 2.

[0051] Furthermore, there may be more than one angle adjustment mechanism 5 . In this embodiment, there are two angle adjustment mechanisms 5 , which are respectively arranged at the feeding end and the discharging end of the conveyor belt 2 , and provide a stable support for the conveyor belt 2 .

[0052] like Figure 8 and Fig. 9As shown, optionally, a baffle 6 can be further provided on one side of the conveyor belt 2. In this embodiment, the baffle 6 and the detection magnet 3 are provided on the same side of the conveyor belt 2. One end of the baffle 6 is located at the discharge port of the feeding mechanism 1, and the baffle 6 extends along the conveying direction of the conveyor belt 2.

[0053] When the magnets to be tested pass through the magnetic field of the detection magnet 3, the vertical distance D between all the magnets to be tested and the detection magnet 3 should be the same. In order to ensure the consistency of the vertical distance D between the magnets to be tested and the detection magnet 3, a baffle 6 is specially provided. When the magnets to be tested move onto the conveyor belt 2, the baffle 6 can adjust the vertical distance between the magnets to be tested and the detection magnet 3 to D.

[0054] like Fig.10 As shown, optionally, the placement angle of the magnet to be tested on the conveyor belt 2 is adjusted so that the magnet to be tested is tilted at a certain angle relative to the detection magnet 3, which makes it easier for the detection magnet 3 to attract unqualified magnets. Optionally, the angle between the long side of the magnet to be tested and the transmission direction of the conveyor belt is 0°~20°, and the placement angle of the magnet to be tested on the conveyor belt 2 can be adjusted according to demand.

[0055] In this embodiment, the magnitude of the attraction of the detection magnet 3 on the magnet to be tested on the conveyor belt 2 is related to the running speed of the conveyor belt, the friction coefficient of the conveyor belt, the mass of the magnet to be tested, the magnetic field strength of the detection magnet, and the vertical distance between the magnet to be tested and the detection magnet. The above parameters can be set according to actual needs. Optionally, in the magnetic field of the first detection magnet 31, the magnetic field strength at the position where the magnet to be measured is subjected to maximum force is 200~260Gs, and the position where the magnet to be measured is subjected to maximum force in the magnetic field of the first detection magnet 31 is the intersection of the symmetric center plane of the first detection magnet perpendicular to the conveying direction of the conveyor belt and the motion trajectory of the magnet to be measured; in the magnetic field of the second detection magnet 32, the magnetic field strength at the position where the magnet to be measured is subjected to maximum force is 200~260Gs, and the position where the magnet to be measured is subjected to maximum force in the magnetic field of the second detection magnet 32 ​​is the intersection of the symmetric center plane of the second detection magnet 32 ​​perpendicular to the conveying direction of the conveyor belt and the motion trajectory of the magnet to be measured; the running speed of the conveyor belt 2 is 3-4m / min (meter / minute); the mass of the magnet to be measured is 40~200g (gram); the vertical distance D between the magnet to be measured and the detection magnet is 20~100mm (millimeter).

[0056] Optionally, the first detection magnet 31 and the second detection magnet 32 ​​of the present embodiment are neodymium iron boron magnets or ferrite magnets. The first detection magnet 31 and the second detection magnet 32 ​​may also be other types of magnets such as electromagnets. There may be multiple detection magnets 3, which are respectively arranged on the sides of the conveyor belt 2. Different types of detection magnets 3 may correspond to different types of magnets to be tested, so that the detection device can meet the detection requirements of various types of magnets.

[0057] Optionally, a receiving mechanism 7 is provided at the discharge end of the conveyor belt 2. The receiving mechanism 7 includes a receiving box 71, which is provided below the discharge end of the conveyor belt 2. The qualified magnet is not attracted by the detection magnet 3, and falls into the receiving box 71 after being transported to the discharge end by the conveyor belt 2.

[0058] Furthermore, the material receiving mechanism 7 further includes a buffer plate 72. Figure 7 The buffer plate 72 is disposed between the discharge end of the conveyor belt 2 and the receiving box 71. The buffer plate 72 is inclined from the discharge end of the conveyor belt 2 toward the receiving box 71 to buffer the falling qualified magnets.

[0059] like Fig.11 As shown, this embodiment provides a method for detecting magnetization direction using the above detection device, including the steps of:

[0060] S1. The loading mechanism transports the magnet to be tested to the conveyor belt. The posture of the magnet to be tested when it moves to the conveyor belt corresponds to the magnetization direction of the qualified magnet being the normal direction of the conveyor belt plane.

[0061] S2. The conveyor belt drives the magnet to be tested to pass through the magnetic field of the first detection magnet of the detection magnet. The unqualified magnet is attracted to the detection magnet, and the qualified magnet is driven by the conveyor belt to move to the discharge end of the conveyor belt.

[0062] According to an optional technical solution of the present application, the above method also includes: the magnetic field of the second detection magnet of the detection magnet is superimposed on the magnetic field of the first detection magnet to enhance the ability to attract unqualified magnets whose magnetization direction is parallel to the conveying direction of the conveyor belt.

[0063] The magnetic field direction of the second detection magnet is opposite to that of the first detection magnet, so that the qualified magnet can be weakly demagnetized to make it non-magnetic.

[0064] Optionally, the method further comprises: tilting the conveyor belt 2 so that the side of the conveyor belt 2 away from the detection magnet is higher than the side close to the detection magnet, so as to facilitate the detection magnet to attract unqualified magnets.

[0065] Optionally, the method further comprises: adjusting the vertical distance between the magnet to be measured and the detection magnet by means of a baffle.

[0066] The magnetization direction detection device and method of the present application have high detection efficiency, high precision, and no missed detection or false detection. The magnet after detection does not have weak magnetism, which does not affect subsequent use.

[0067] Example 1

[0068] The above-mentioned detection device was used to detect the magnets to be tested. There were a total of 100 magnets to be tested, with a size of 54mm*9mm*4mm, of which the 4mm direction was the designed magnetization direction. 98 of the magnets to be tested were qualified magnets, that is, the magnetization direction was consistent with the designed direction, and 2 were unqualified magnets, and the two incorrect magnetization directions of the unqualified magnets were the 54mm direction and the 9mm direction, respectively.

[0069] In this embodiment, the detection magnet 3 only includes the first detection magnet 31. In the magnetic field of the first detection magnet 31, the magnetic field strength at the position where the magnet to be tested is subjected to the maximum force is 220Gs; the running speed of the conveyor belt 2 is 1m / min; the material of the conveyor belt is rubber, and the friction coefficient with the magnet to be tested is 0.9, and the conveyor belt is inclined at 15°; the mass of the magnet to be tested is 100g; the vertical distance D between the magnet to be tested and the detection magnet is 57mm. When loading, all the magnets to be tested move to the conveyor belt in the same posture, and the postures of all the magnets to be tested are the same as the normal direction of the 4mm direction and the conveyor belt plane.

[0070] The detection result showed that 98 qualified magnets followed the conveyor belt to the discharge end of the conveyor belt, and 2 unqualified magnets were attracted by the detection magnet 3, thus achieving the separation of qualified magnets from unqualified magnets.

[0071] The residual magnetism of 10 qualified magnets of this embodiment before and after the magnetization direction detection is as follows:

[0072] Example 1 Residual magnetism of qualified magnets (Gs)

[0073]

[0074] Example 2

[0075] The detection device and parameter settings of this embodiment are the same as those of Embodiment 1. The magnets to be tested include 40 qualified magnets and 60 unqualified magnets, of which 30 are in each of the two wrong directions.

[0076] The test results are as follows: all the unqualified magnets whose magnetization direction is perpendicular to the conveying direction of the conveyor belt in the conveyor belt plane are attracted by the detection magnet 3. One unqualified magnet whose magnetization direction is parallel to the conveying direction of the conveyor belt is not attracted by the detection magnet 3.

[0077] Example 3

[0078] In the detection device of this embodiment, the detection magnet 3 includes a first detection magnet 31 and a second detection magnet 32. In the magnetic field of the first detection magnet 31, the magnetic field strength at the position where the magnet to be tested is subjected to the maximum force is 220Gs, and in the magnetic field of the second detection magnet 32, the magnetic field strength at the position where the magnet to be tested is subjected to the maximum force is 220Gs, but the directions of the magnetic fields of the two are opposite. The remaining parameter settings are the same as those in Example 1. The magnets to be tested are 98 qualified magnets and 2 unqualified magnets, and one unqualified magnet has two wrong directions.

[0079] The detection result showed that 98 qualified magnets followed the conveyor belt to the discharge end of the conveyor belt, and 2 unqualified magnets were attracted by the detection magnet 3, thus achieving the separation of qualified magnets from unqualified magnets.

[0080] The residual magnetism of 10 qualified magnets of this embodiment before and after the magnetization direction detection is as follows:

[0081] Example 3 Residual magnetism of qualified magnets (Gs)

[0082]

[0083] By comparing Example 3 with Example 1, it can be seen that by providing the second detection magnet 32, the weak magnetization demagnetization of the qualified magnet can be achieved, and the qualified magnet after detection has almost no weak magnetism, which is more beneficial for subsequent use.

[0084] Example 4

[0085] The detection device and parameter settings of this embodiment are the same as those of Embodiment 3. The magnets to be tested are 40 qualified magnets and 60 unqualified magnets whose magnetization directions are parallel to the conveying direction of the conveyor belt.

[0086] The detection result shows that all unqualified magnets are attracted by the detection magnet 3.

[0087] By comparing Example 4 with Example 2, it can be seen that the provision of the second detection magnet 32 ​​can further improve the accuracy of the detection device and eliminate missed detection.

[0088] Example 5

[0089] The detection device was used to detect the magnets to be tested, including 98 qualified magnets and 2 unqualified magnets, and the unqualified magnets had two wrong directions.

[0090] In this embodiment, the detection magnet 3 includes a first detection magnet 31 and a second detection magnet 32. In the magnetic field of the first detection magnet 31, the magnetic field strength at the position where the magnet to be measured is subjected to the maximum force is 200Gs. In the magnetic field of the second detection magnet 32, the magnetic field strength at the position where the magnet to be measured is subjected to the maximum force is 200Gs, but the directions of the two magnetic fields are opposite; the running speed of the conveyor belt 2 is 0.8m / min; the material of the conveyor belt is rubber, and the friction coefficient with the magnet to be measured is 0.9, and the conveyor belt is inclined by 15°; the mass of the magnet to be measured is 100g; the vertical distance D between the magnet to be measured and the detection magnet is 60mm.

[0091] The test results show that 98 qualified magnets follow the conveyor belt to the discharge end of the conveyor belt, and the two unqualified magnets are attracted by the detection magnet 3, thus achieving the separation of qualified magnets from unqualified magnets.

[0092] The residual magnetism of 10 qualified magnets of this embodiment before and after the magnetization direction detection is as follows:

[0093] Example 5: Residual magnetism of qualified magnets (Gs)

[0094]

[0095] It can be seen that the residual magnetism is very low, which is more beneficial for subsequent use.

[0096] Example 6

[0097] The detection device was used to detect the magnets to be tested. Among the magnets to be tested, 98 were qualified and 2 were unqualified. Among the unqualified magnets, there was one in each of the two wrong directions.

[0098] In this embodiment, the detection magnet 3 includes a first detection magnet 31 and a second detection magnet 32. In the magnetic field of the first detection magnet 31, the magnetic field strength at the position where the magnet to be measured is subjected to the maximum force is 260Gs. In the magnetic field of the second detection magnet 32, the magnetic field strength at the position where the magnet to be measured is subjected to the maximum force is 260Gs, but the directions of the magnetic fields of the two are opposite; the running speed of the conveyor belt 2 is 1.2m / min; the material of the conveyor belt is rubber, and the friction coefficient with the magnet to be measured is 0.9, and the conveyor belt is inclined by 20°; the mass of the magnet to be measured is 100g; the vertical distance D between the magnet to be measured and the detection magnet is 53mm.

[0099] The test results show that 98 qualified magnets follow the conveyor belt to the discharge end of the conveyor belt, and the two unqualified magnets are attracted by the detection magnet 3, thus achieving the separation of qualified magnets from unqualified magnets.

[0100] The residual magnetism of 10 qualified magnets of this embodiment before and after the magnetization direction detection is as follows:

[0101] Example 6 Residual magnetism of qualified magnets (Gs)

[0102]

[0103] The remanence of the qualified magnet in this embodiment is slightly higher than that of the qualified magnet in Embodiment 5, because the present application improves the magnetic field strength of the detection magnet and the speed of the conveyor belt.

[0104] Example 7

[0105] The detection device was used to detect the magnets to be tested, including 98 qualified magnets and 2 unqualified magnets, and the unqualified magnets had two wrong directions.

[0106] In this embodiment, the detection magnet 3 includes a first detection magnet 31 and a second detection magnet 32. In the magnetic field of the first detection magnet 31, the magnetic field strength at the position where the magnet to be measured is subjected to the maximum force is 230Gs, and in the magnetic field of the second detection magnet 32, the magnetic field strength at the position where the magnet to be measured is subjected to the maximum force is 230Gs, but the directions of the two magnetic fields are opposite; the running speed of the conveyor belt 2 is 1m / min; the material of the conveyor belt is PVC material, and the friction coefficient with the magnet to be measured is 0.5, and the conveyor belt is not tilted; the mass of the magnet to be measured is 100g; the vertical distance D between the magnet to be measured and the detection magnet is 54mm.

[0107] The test results show that 98 qualified magnets follow the conveyor belt to the discharge end of the conveyor belt, and the two unqualified magnets are attracted by the detection magnet 3, thus achieving the separation of qualified magnets from unqualified magnets.

[0108] The residual magnetism of 10 qualified magnets of this embodiment before and after the magnetization direction detection is as follows:

[0109] Example 7 Residual magnetism of qualified magnets (Gs)

[0110]

[0111] It can be seen from the above embodiments that the detection device of the present application can separate unqualified magnets from qualified magnets while transmitting the magnet to be tested, and it can be seen that the detection efficiency is very high; in addition, setting two detection magnets with opposite magnetic field directions can further improve the accuracy of detection, and can eliminate the weak magnetism of the magnet to be tested, which is more conducive to subsequent use; moreover, when the magnetic field strength at the position where the magnet to be tested is subjected to the maximum force is 200-260Gs, the unqualified and qualified magnets to be tested can be accurately separated; the transmission speed will slightly affect the residual remanence, but the effect is not significant; tilting the conveyor belt 10-20 degrees helps to separate the detection magnet more easily, further improving the detection efficiency.

[0112] The embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application, but the description of the above embodiments is only used to help understand the technical solution and core ideas of the present application. Those skilled in the art can make more changes or deformations based on the specific implementation methods and application scope of the present application according to the inspiration of the ideas and embodiments of the present application, which should all belong to the scope of protection of the present application. In summary, the content of this specification should not be construed as a limitation on the present application.

Claims

1. A magnetization direction detection device, characterized in that: include: Feeding mechanism; A conveyor belt, wherein the feeding mechanism conveys the magnet to be tested onto the conveyor belt; Detection magnets, including: A first detection magnet, which is disposed on one side of the conveyor belt, and has two poles located on a side of the first detection magnet close to the conveyor belt and a side of the first detection magnet away from the conveyor belt, respectively. The conveyor belt drives the magnet to be tested to pass through the magnetic field of the first detection magnet, and unqualified magnets are attracted to the first detection magnet; A second detection magnet, the two poles of the second detection magnet are respectively located on the side of the second detection magnet close to the conveyor belt and the side away from the conveyor belt, the second detection magnet and the first detection magnet are arranged side by side, the polarity of the magnetic pole of the second detection magnet close to the conveyor belt is opposite to the polarity of the magnetic pole of the first detection magnet close to the conveyor belt, the magnetic fields of the first detection magnet and the second detection magnet are superimposed, so that the magnetic field strength at the position between the first detection magnet and the second detection magnet is increased, and unqualified magnets can be attracted to the first detection magnet when they are between the first detection magnet and the second detection magnet.

2. The magnetization direction detection device according to claim 1, characterized in that: The first detection magnet and the second detection magnet are spaced 40-60 mm apart.

3. The magnetization direction detection device according to claim 1, characterized in that: The conveyor belt is arranged obliquely, and a side of the conveyor belt away from the detection magnet is higher than a side close to the detection magnet.

4. The magnetization direction detection device according to claim 3, characterized in that: An angle adjustment mechanism is arranged below the side of the conveyor belt away from the detection magnet. The angle adjustment mechanism comprises a lifting rod, one end of which supports the conveyor belt.

5. The magnetization direction detection device according to claim 4, characterized in that: The angle adjustment mechanism also includes an angle scale, and the angle scale is used to display the inclination angle of the conveyor belt.

6. The magnetization direction detection device according to claim 1, characterized in that: It also includes a frame, and the feeding mechanism, the conveyor belt and the detection magnet are all arranged on the frame.

7. The magnetization direction detection device according to claim 1, characterized in that: It also includes a baffle plate for adjusting the vertical distance between the magnet to be tested and the detection magnet.

8. The magnetization direction detection device according to claim 1, characterized in that: It also includes a material receiving box, which is arranged below the discharge end of the conveyor belt.

9. The magnetization direction detection device according to claim 8, characterized in that: A buffer plate is arranged between the discharging end of the conveyor belt and the material receiving box.

Images