Item type identification device

Abstract

The present invention relates to the application field of magnetic sensors, and the provided device for identifying the type of items includes a substrate and an item, wherein the substrate has an identification position, the item can be detachably matched with the identification position in a preset posture, and the same identification position can be matched with at most one item at the same time; the item has a permanent magnet, and the substrate is provided with a three-axis magnetic sensor at a position corresponding to the identification position, the three-axis magnetic sensor can be used to detect the direction of the magnetic field, and the center position of the permanent magnet of the item is directly opposite to the corresponding three-axis magnetic sensor along the third direction; the direction from the south pole to the north pole of the permanent magnet is the fourth direction, and for the same identification position, the fourth direction of the permanent magnet corresponding to each item when matching with the identification position is perpendicular to the third direction, and the fourth directions corresponding to any two items are different; when the angle between the magnetic field direction detected by the three-axis magnetic sensor and the third direction exceeds the preset angle range, it is determined that the corresponding identification position and the item match abnormally. This scheme is conducive to improving the accuracy of item type identification.

Description

Technical Field

[0001] The invention relates to the application field of magnetic sensors, and in particular to an object type identification device. Background Art

[0002] The electronic chessboard has the advantages of both offline physical chessboards and online APP chessboards. It can not only give users the experience of a physical chessboard, but also apply various intelligent gameplays in the APP. It is widely used in application scenarios such as distance learning and single-player challenges.

[0003] Taking chess / international chess as an example, common electronic chessboards include the following two types:

[0004] One solution is to set a Hall sensor on the chessboard and a permanent magnet on the chess piece. The Hall sensor is used to sense the permanent magnet to sense whether there is a chess piece at the chess position, and the type of the corresponding chess piece is determined by the chess playing rules and the memory of the chess playing trajectory. Relevant public patent documents include CN101721804B, CN201889059U, CN205042085U, CN205730273U, and CN105709409A.

[0005] Another solution additionally uses radio frequency identification, optical identification, magnetic coding array and other technologies to identify the type of chess piece. For example, CN102872586B uses optical coding to identify the type of chess piece, CN111617462A / CN202983151U uses radio frequency technology to identify the type of chess piece, CN2523473Y uses reflection to identify the type of chess piece, and CN110478887A uses a magnetic coding array to identify the type of chess piece.

[0006] In addition, a Chinese invention patent application with publication number CN106730401A discloses a hand tool device and an anti-interference identification method for quickly identifying the type of a hand tool treatment head. The scheme uses an encoder to sense the installation angle of a permanent magnet to identify the type of a hand tool treatment head.

[0007] In addition, the Chinese invention patent application with publication number CN106405454A discloses a magnetic angle sensing system, which detects the angular position of the magnet by sensing the magnetic field vector of the magnet through a magnetic angle sensor, and the disclosure of the invention discloses a magnetic angle sensing system. Figure 1 and Figure 4 Two different relative position relationships between the magnetic angle sensor and the magnet are shown.

[0008] Regarding the solution of determining the corresponding chess piece type by means of chess playing rules and memorizing chess playing trajectories, this solution is often only applicable to the situation where the initial position of the chess piece is determined. On the one hand, this imposes a great restriction on the user's use of the electronic chessboard, resulting in the user being unable to place the endgame independently. On the other hand, this solution is not applicable to chess games where the initial position of the chess piece is uncertain.

[0009] For solutions that additionally use technologies such as radio frequency identification, optical identification, and magnetic coding arrays to identify the type of chess pieces, such solutions require the use of sensors that are several times the number of chess positions. The large number of sensors results in a high cost for the electronic chessboard and a relatively complex structure. For example, solutions that use radio frequency identification often also require the installation of a three-axis magnetic sensor to sense whether a chess piece is located at a chess position. Both a radio frequency identification module and a three-axis magnetic sensor are required under each chess position. Such electronic chessboards use a large number of sensors / identification modules, resulting in a high cost for the electronic chessboard and a relatively complex structure.

[0010] For the solution of identifying the type of the hand therapy head by using an encoder to sense the installation angle of a permanent magnet, when the hand therapy head and the hand handle are in a mating state, the type of the hand therapy head can be identified by using the encoder to sense the installation angle of the permanent magnet; however, when the mating between the hand therapy head and the hand handle is abnormal, the result of identifying the type of the hand therapy head by using the encoder to sense the installation angle of the permanent magnet may be erroneous. Summary of the invention

[0011] The purpose of the present invention is to overcome the above-mentioned defects of the prior art and to provide an object type identification device which can identify the type of objects and has a small amount of sensors, a simple structure and accurate identification results.

[0012] The object type identification device provided by the present invention includes a substrate and an object, the substrate has an identification position, the object can be detachably matched with the identification position in a preset posture, and the same identification position can be matched with at most one object at the same time; the object has a permanent magnet, and the substrate is provided with a three-axis magnetic sensor at a position corresponding to the identification position, the three-axis magnetic sensor can be used to detect the direction of the magnetic field, and the center position of the permanent magnet of the object is directly opposite to the corresponding three-axis magnetic sensor along the third direction; the direction from the south pole to the north pole of the permanent magnet is the fourth direction, for the same identification position, the fourth direction of the permanent magnet corresponding to each object when matching with the identification position is perpendicular to the third direction, and the fourth directions corresponding to any two objects are different; when the component of the magnetic field detected by the three-axis magnetic sensor in the third direction is greater than or equal to a preset first threshold value, it is determined that the corresponding identification position and the object are abnormally matched; or when the angle between the magnetic field direction detected by the three-axis magnetic sensor and the third direction exceeds the preset angle range, it is determined that the corresponding identification position and the object are abnormally matched.

[0013] As can be seen from the above, on the one hand, the fourth directions of the present scheme are different from each other, so it is possible to distinguish various types of objects according to the detection results of the three-axis magnetic sensor, thereby realizing the identification of the types of objects; on the other hand, the present scheme only needs to set one three-axis magnetic sensor for each identification position to realize the identification of the type of object, and the present scheme uses fewer sensors and has a simple structure; on the other hand, since the present scheme can determine whether there are abnormally matched objects at the corresponding identification position without adding additional sensors, it can not only reduce the probability of identification errors, which is beneficial to improving the accuracy of object type identification, but also help to reduce the number of sensors, which is beneficial to the simple structure of the object type identification device.

[0014] A preferred solution is that the three-axis magnetic sensor can be used to detect the size of the magnetic field. When the angle between the magnetic field direction detected by the three-axis magnetic sensor and the third direction exceeds a preset angle range, and the size of the magnetic field detected by the three-axis magnetic sensor is greater than or equal to a preset second threshold, it is determined that the corresponding identification position is abnormally matched with the object.

[0015] As can be seen from the above, this is further conducive to improving the accuracy of judging coordination anomalies.

[0016] Another preferred solution is that the three-axis magnetic sensor can be used to detect the size of the magnetic field. When it is not determined that the identification position and the object are abnormally matched, and the size of the magnetic field detected by the three-axis magnetic sensor is greater than or equal to a preset second threshold, the object type identification device identifies the type of object that matches the identification position based on the direction of the magnetic field detected by the three-axis magnetic sensor.

[0017] Another preferred solution is that the base and the object are matched to have a limiting position structure, which limits the object to an identification position in a preset posture, and limits the rotation of the object relative to the base; the limiting position structure includes a concave-convex matching structure; and / or the limiting position structure includes a magnetic positioning structure.

[0018] Another preferred solution is that the device for identifying the type of object further comprises a status prompt unit, which is communicatively connected with the three-axis magnetic sensor; when it is determined that the base and the object are abnormally matched, the corresponding status prompt unit sends a prompt message.

[0019] A further solution is that the status prompt unit is a status indicator light / sound prompt device.

[0020] Another preferred solution is that the three-axis magnetic sensor can be used to detect the vector direction of the magnetic field; or the three-axis magnetic sensor can be used to detect the straight line direction parallel to the magnetic field vector, and for the same identification position, the fourth directions corresponding to any two objects are not parallel to each other; the three-axis magnetic sensor includes a magnetic sensor chip; the object can be detachably matched to the corresponding identification position along the third direction.

[0021] Another preferred solution is that the substrate has a first mating surface at the identification position, the object has a second mating surface, the first mating surface fits with the second mating surface of the corresponding object, and the normal of the first mating surface and the normal of the second mating surface of the corresponding object are both along a third direction.

[0022] Another preferred solution is that the article type identification device is a tool library, the tool library includes tools and storage racks for storing the tools, the base is the storage rack, and the articles are tools.

[0023] Another preferred solution is that the base and the object are detachably fixedly connected, and an elastic member is provided between the base and the object, and the elastic member forces the object to move away from the identification position when the object and the identification position do not match properly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a partial structural diagram of the first embodiment of the device for identifying the type of article of the present invention.

[0025] Figure 2 It is a partial structural exploded view of the first embodiment of the device for identifying the type of article of the present invention.

[0026] Figure 3 It is a cross-sectional view of the coordination between chess pieces and chess positions in the first embodiment of the device for identifying the type of objects of the present invention.

[0027] Figure 4 It is a schematic diagram of the chess piece "Red General" in the first embodiment of the device for identifying the type of objects of the present invention.

[0028] Figure 5 Schematic diagram of the chess piece "Red Knight" in the first embodiment of the device for identifying the type of an object of the present invention.

[0029] Figure 6 It is a schematic diagram of the chess piece "red phase" in the first embodiment of the device for identifying the type of objects of the present invention.

[0030] Figure 7 1 is a top view of a second embodiment of an article type identification device according to the present invention. DETAILED DESCRIPTION

[0031] First embodiment

[0032] This embodiment of Figures 1 to 6 A unified spatial rectangular coordinate system (right-hand system) is used to represent the relative position relationship between the various features of this embodiment, wherein the positive direction of the Z axis is vertically upward.

[0033] The object type identification device in this embodiment is chess, please refer to Figure 1 and Figure 2The chess piece includes a chessboard 1 (an example of a substrate) and chess pieces 2 (an example of an object). The chessboard 1 includes a bottom shell 11, a panel 13 and a circuit board 12. The panel 13 is located on the upper side of the bottom shell 11 (the positive side of the Z axis). The bottom shell 11 and the panel 13 form a mounting cavity 14, and the circuit board 12 is fixed in the mounting cavity 14.

[0034] Please refer to Figure 1 and Figure 2 The upper main surface of the panel 13 is the working surface 131, and the normal of the working surface 131 is along the vertical direction (an example of the third direction). The working surface 131 has nine columns of chess positions (an example of identification positions) distributed along the X-axis direction, and each column of chess positions has ten positions distributed along the Y-axis direction, with a total of ninety chess positions arranged in an array of ten rows and nine columns.

[0035] Pawn 2 includes Red King 2a (see Figure 4 ), Red Knight 2b (see Figure 5 ), red phase 2c (see Figure 6 ), red horse, red chariot, red cannon, red soldier, black general, black soldier, black elephant, black horse, black chariot, black cannon, and black pawn, a total of fourteen types. The chess pieces 2 can be detachably matched with the chess positions on the chessboard 1, and each chess position can be matched with at most one chess piece 2. The content and color of the marks such as "General" and "Soldier" on the chess pieces 2 are the visual type identifications of the chess pieces 2.

[0036] The circuit board 12 has ninety three-axis magnetic sensors 121 distributed in an array of ten rows and nine columns. Each three-axis magnetic sensor 121 corresponds to each chess position one by one. The three-axis magnetic sensor 121 is located directly below the corresponding chess position, that is, the three-axis magnetic sensor 121 is located on the negative side of the Z axis of the corresponding chess position.

[0037] The three-axis magnetic sensor 121 of this embodiment can detect the vector components of the magnetic field vector in three directions perpendicular to each other, for example, it can detect the vector components of the magnetic field in the X-axis direction, the Y-axis direction and the Z-axis direction, so that the vector direction of the magnetic field at the three-axis magnetic sensor 121 can be calculated. The three-axis magnetic sensor 121 can be set with reference to the prior art, for example, with reference to the three-axis magnetic sensor in the Chinese invention patent application with publication number CN108205119A, or with reference to the single-chip three-axis magnetic field sensor in the Chinese invention patent application with publication number CN103913709A or CN103105592A, or with reference to the three-axis linear magnetic sensor in the Chinese invention patent application with publication number CN103954920A; specifically, the three-axis magnetic sensor includes a magnetic sensor chip, and the magnetic sensor chip of this embodiment can be, for example, the magnetic field sensor chip of CN103105592A.

[0038] The chess piece 2 and the chess position are matched with a limiting position structure, which sets the chess piece 2 in a preset posture (for example Figure 1 The posture shown in the figure is limited to the corresponding chess position, and the limiting position structure limits the rotation of the chess piece 2 relative to the chessboard 1; specifically, the cross-sectional contour shape of the normal line of the chess piece 2 along the vertical direction is a circle with a flat cut, and the flat cut of the chess piece 2 is located at the negative end of the Y axis. Each chess position has a groove 132, and the cross-sectional contour shape of the normal line of the groove 132 along the vertical direction is a circle with a flat cut. The cross-sectional contour of the normal line of the groove 132 along the vertical direction matches the cross-sectional contour of the normal line of the chess piece 2 along the vertical direction. When the chess piece 2 is placed in the groove 132, it is matched with the corresponding chess position, and the groove 132 limits the rotation of the chess piece 2 relative to the chessboard 1.

[0039] The groove 132 and the flat cutout of the chess piece 2 constitute the limiting structure of this embodiment. Optionally, in other embodiments of the present invention, the limiting structure may also be a concave-convex matching structure of other shapes.

[0040] Optionally, in other embodiments of the present invention, the positioning structure may also adopt a magnetic positioning structure, and the scheme of the magnetic positioning structure may be set with reference to the prior art, for example, with reference to the magnet positioning adsorption structure in the utility model patent with publication number CN210582466U.

[0041] The bottom surface of the groove 132 is the first mating surface, and the bottom surface of the chess piece 2 is the second mating surface. The first mating surface and the second mating surface of the corresponding chess piece 2 are both planes whose normals are along the vertical direction. The second mating surface of the chess piece 2 fits with the first mating surface of the corresponding groove 132, which is conducive to improving the stability of the mating between the chess piece 2 and the chess position.

[0042] Please refer to Figure 3 , the chess piece 2 has a permanent magnet 21 built in, for example Figure 4 The permanent magnet 21a of the "Hongshuai" 2a shown, Figure 5 The permanent magnet 21b and Figure 6 The permanent magnet 21c of the "red phase" 2c shown in the figure, when the chess piece 2 is matched with the chess position, the corresponding three-axis magnetic sensor 121 is located directly below the chess piece 2, and the three-axis magnetic sensor 121 is located directly below the center position of the permanent magnet 21 of the chess piece 2, that is, the corresponding three-axis magnetic sensor 121 is directly opposite to the center position of the permanent magnet 21 of the corresponding chess piece 2 along the Z-axis direction, and the direction from the south pole of the permanent magnet 21 to the north pole is the fourth direction A, and the fourth direction A of each permanent magnet 21 is perpendicular to the vertical direction, that is, the fourth direction A of each permanent magnet 21 is along the horizontal direction.

[0043] For the same chess position, the fourth directions A corresponding to the chess pieces 2 of the same type when cooperating with the chess position are in the same direction. The fourth directions A corresponding to any two chess pieces 2 when cooperating with the chess position are different. Please refer to Figures 4 to 6For example, the fourth direction A1 corresponding to the "Red General" 2a is in the same direction as the positive direction of the X-axis, the fourth direction A2 corresponding to the "Red Knight" 2b is 25° when rotated counterclockwise to the positive direction of the X-axis, and the fourth direction A3 corresponding to the "Red Prime Minister" 2c is 50° when rotated counterclockwise to the positive direction of the X-axis... and so on. The fourth directions A corresponding to any two chess pieces 2 have an angle of at least 25° between them.

[0044] Correspondingly, for the same chess position, the vector direction of the magnetic field generated by the corresponding permanent magnet 21 when the chess piece 2 cooperates with the chess position at the corresponding three-axis magnetic sensor 121 is the first direction B, and the first directions B corresponding to the same kind of chess pieces 2 are in the same direction, and there is an angle between the first directions B corresponding to any two kinds of chess pieces 2, that is, the first directions B corresponding to each kind of chess piece 2 are different.

[0045] Therefore, when the chess piece 2 is matched with the chess position, the present embodiment can identify the type of the chess piece 2 matched with the corresponding chess position according to the vector direction of the magnetic field detected by the three-axis magnetic sensor 121. Specifically, the three-axis magnetic sensor 121 of the present embodiment detects the actual direction of the magnetic field vector at its position, and the chess piece type corresponding to the first direction B matching the actual direction is the type of the chess piece 2 matched with the corresponding chess position.

[0046] For example, see Figure 4 and Figure 5 In this embodiment, the first direction corresponding to the "Red General" 2a is along the negative direction of the X-axis, that is, the opposite direction of the fourth direction A1 corresponding to the "Red General" 2a. In this embodiment, the first direction corresponding to the "Red Soldier" 2b is along the opposite direction of the corresponding fourth direction A2... and so on. When the corresponding three-axis magnetic sensor 121 detects that the direction of the magnetic field vector is along the negative direction of the X-axis, the corresponding chess piece 2 can be determined to be the "Red General" 2a. When the corresponding three-axis magnetic sensor 121 detects that the direction of the magnetic field vector is along the opposite direction of the fourth direction A2, the corresponding chess piece 2 can be determined to be the "Red Soldier" 2b. Of course, taking into account the installation and manufacturing errors, the corresponding chess piece 2 can also be determined to be the "Red General" 2b when the angle between the direction of the magnetic field vector detected by the three-axis magnetic sensor 121 and the negative direction of the X-axis is within ±5°. In this way, a slight position and angle deviation can be allowed between the chess piece 2 and the chess position, and the cooperation between the chess piece 2 and the groove 132 can be set to a loose cooperation, which is beneficial to improving the user's chess playing experience.

[0047] Since the present embodiment can detect the type of each chess piece 2, the chess of the present embodiment can be used to realize endgame practice of online and offline linkage, which is beneficial to expand the scope of application of the chess of the present embodiment and facilitate users to freely use the chess of the present embodiment; and, in the present embodiment, each chess position only needs to be provided with a corresponding three-axis magnetic sensor 121 to realize the identification of the type of the chess piece 2, which is beneficial to simplify the structure of the chess.

[0048] However, although the above scheme can identify the type of chess piece according to the detection result of the corresponding three-axis magnetic sensor 121 when the chess piece 2 is in a matching state with the chess position, when the chess piece 2 is abnormally matched with the chess position (for example, the position of the chess piece 2 is offset to a certain extent compared with the position when it is matched with the chess position, and the posture of the chess piece is tilted to a certain extent compared with the posture when it is matched with the chess position), the direction of the magnetic field generated by the permanent magnet 21 of the chess piece 2 at the corresponding three-axis magnetic sensor 121 will change. At this time, the chess piece is identified according to the detection result of the three-axis magnetic sensor 121. 2 may be wrong. Therefore, in order to reduce the risk of identification error caused by abnormal coordination between chess piece 2 and the chess position, this embodiment identifies whether the coordination between chess piece 2 and the chess position is abnormal. This embodiment determines that the coordination between chess piece 2 and the chess position is abnormal when the component of the magnetic field detected by the three-axis magnetic sensor 121 in the Z-axis direction is greater than or equal to a preset first threshold; or when the angle between the magnetic field vector direction detected by the three-axis magnetic sensor 121 and the Z-axis direction exceeds a preset angle range (for example, exceeds the range of 90°±3°), it is determined that the coordination between chess piece 2 and the chess position is abnormal.

[0049] In this embodiment, when the chess piece 2 is in a matching state with the chess position, since the fourth direction A corresponding to the chess piece 2 is perpendicular to the Z-axis direction, and the center position of the three-axis magnetic sensor 121 and the corresponding permanent magnet 21 is directly opposite to each other along the Z-axis direction, the direction of the magnetic field vector detected by the three-axis magnetic sensor 121 at this time should be perpendicular to the Z-axis direction, and the magnitude of the magnetic field vector in the Z-axis direction detected by the three-axis magnetic sensor 121 should be zero; on this basis, considering that a certain error is allowed in the matching between the chess piece 2 and the chess position, in practice, the magnitude of the component of the magnetic field vector detected by the three-axis magnetic sensor 121 in the Z-axis direction will also be significantly smaller than the magnitude of the component of the magnetic field vector in the direction perpendicular to the Z-axis. The magnitude of the component of the magnetic field vector detected by the three-axis magnetic sensor 121 in the Z-axis direction should be smaller than the allowed range (smaller than the first threshold), and the angle between the magnetic field vector direction detected by the three-axis magnetic sensor 121 and the Z-axis direction should be close to 90°. Therefore, if the angle between the magnetic field vector direction detected by the three-axis magnetic sensor 121 and the Z-axis direction exceeds the preset angle range (for example, exceeds the range of 90°±3°), or the magnitude of the component of the magnetic field vector detected by the three-axis magnetic sensor 121 in the Z-axis direction is too large (greater than or equal to the preset first threshold), then it means that the chess piece 2 at the corresponding chess position is abnormally matched with the corresponding chess position. When the chess piece 2 and the chess position are abnormally matched, the direction of the magnetic field vector detected by the three-axis magnetic sensor 121 may be greatly different from the first direction B corresponding to the chess piece 2, and the identification result of the type of the chess piece 2 may be wrong at this time. Therefore, before identifying the type of the object, this solution also detects whether the chess piece 2 and the chess position are abnormally matched, which is conducive to avoiding the use of the detection result of the three-axis magnetic sensor 121 when the chess piece 2 and the chess position are abnormally matched as the identification of the type of the chess piece 2, and avoiding the error in the identification of the type of the chess piece 2 due to the abnormal matching of the chess piece 2 and the chess position. In addition, the three-axis magnetic sensor 121 of this solution is used to detect whether the chess piece 2 and the chess position are abnormally matched, and to identify the type of the chess piece 2. In this way, this solution does not need to set up additional sensors to detect whether the chess piece 2 and the chess position are abnormally matched, which is conducive to saving the number of sensors, simplifying the structure of this solution, and improving the economy of this solution.

[0050] Preferably, the chess has a status prompt unit corresponding to the chess position, and the status prompt unit is in communication connection with the corresponding three-axis magnetic sensor 121; when it is determined that the corresponding chess position has a chess piece 2 with abnormal coordination, the corresponding status prompt unit sends a prompt message. In this way, when the chess position and the chess piece 2 are abnormally coordinated, the chess player can get feedback from the status prompt unit, which is helpful for the chess player to grasp whether the chess piece 2 and the chess position are abnormally coordinated, and is helpful for improving the user experience.

[0051] Specifically, the steps of identifying the type of chess pieces in this embodiment are as follows: the first step is to obtain the actual size and actual direction of the magnetic field vector detected by the three-axis magnetic sensor 121; the second step is to determine whether the actual size of the magnetic field is greater than or equal to the second threshold value, if so, the third step is executed to determine whether the actual component size of the magnetic field in the Z-axis direction is greater than or equal to the first threshold value, if so, the fourth step is executed to control the state prompt unit to issue a prompt message to prompt that the chess piece 2 is abnormally matched with the chess position; if the execution result of the second step is no, the program is terminated, or the first step is re-executed. If the execution result of the third step is no, the chess piece type corresponding to the first direction B matching the actual direction is used as the type of chess piece 2 matched with the corresponding chess position, thereby completing the identification of the type of chess piece 2. Of course, at this time, the state prompt unit can also be controlled to issue a prompt message that the chess piece 2 is in a matched state with the chess position.

[0052] In this embodiment, the magnitude of the magnetic field detected by the three-axis magnetic sensor 121 is greater than or equal to the preset second threshold value, indicating that there is a chess piece 2 at the corresponding chess position. Of course, at this time, the corresponding chess position and the chess piece 2 may be in a coordinated state, or the corresponding chess position and the chess piece 2 may be abnormally coordinated. After the magnitude of the magnetic field detected by the three-axis magnetic sensor 121 is greater than or equal to the second threshold value, it is determined whether there is an abnormally coordinated chess piece 2 at the corresponding chess position, and the type of chess piece 2 coordinated with the chess position is identified, which can reduce the risk of recognition errors caused by abnormal coordination between the chess piece 2 and the chess position. Of course, the second threshold value can be obtained through experiments, which will not be repeated here.

[0053] Specifically, the status prompt unit is a status indicator light, each chess position corresponds to a status indicator light, the status indicator light extends along the outer edge of the corresponding chess position, the chess position is surrounded by the corresponding status indicator light, the status indicator light can be lit in red or green, and the status indicator light can be in a flashing state. When it is determined that the corresponding chess position has a chess piece 2 with an abnormal coordination, the corresponding status indicator light is lit in red; when it is not determined that the chess piece 2 and the corresponding chess position have an abnormal coordination, and the magnetic field vector size detected by the three-axis magnetic sensor 121 is greater than or equal to the preset second threshold, the corresponding status indicator light is lit in green; when it is not determined that the chess piece and the corresponding chess position have an abnormal coordination, and the magnetic field vector size detected by the three-axis magnetic sensor is less than the preset second threshold, the corresponding status indicator light is off.

[0054] Of course, in addition to indicating whether the corresponding chess position is matched with a chess piece 2 and whether the corresponding chess position has a chess piece 2 with abnormal matching, the status indicator light can also be used to issue operation prompts to the chess player. For example, in the process of applying the chess of this embodiment to chess teaching, the status indicator light corresponding to a chess position flashes, indicating that the chess player should move the chess piece 2 matched with the chess position next, or that the chess player should move the chess piece 2 at other positions to match the chess position next.

[0055] Optionally, in other embodiments of the present invention, the status prompt unit may also include a sound prompt device such as a speaker or a buzzer. The sound prompt device and the status indicator light may be used simultaneously or one of them may be used selectively. When there is an abnormally coordinated chess piece at the corresponding chess position, the sound prompt device emits a sound to remind the chess player.

[0056] In this embodiment, each chess position corresponds to a status prompt unit. Of course, in other embodiments of the present invention, multiple chess positions can share one status prompt unit. When each chess position has chess pieces with abnormal coordination, the same status prompt unit will prompt the abnormal status.

[0057] The three-axis magnetic sensor 121 of this embodiment is used to detect the direction of the magnetic field vector. Optionally, in other embodiments of the present invention, the three-axis magnetic sensor can be used to detect the direction of a straight line parallel to the magnetic field vector. For the same chess position, the fourth directions A corresponding to any two chess pieces are not parallel to each other, so the first directions B corresponding to any two chess pieces are also not parallel to each other. Similarly, the type of chess piece can be identified based on the straight line direction of the magnetic field vector detected by the three-axis magnetic sensor.

[0058] Optionally, in other embodiments of the present invention, the article type identification device may also be a tool magazine, for example, the tool magazine is a tool magazine of a machining center, the tool magazine is used to store cutting tools, the tool magazine may be, for example, a conical tool magazine, a disc tool magazine or a chain tool magazine, the tool magazine has a plurality of installation positions (instances of identification positions), the cutting tools are detachably fixedly installed in the installation positions of the tool magazine in a preset posture, by arranging the three-axis magnetic sensor of the present invention in the tool magazine, and arranging the permanent magnet of the present invention on the cutting tool, it is possible to identify the type of cutting tool at the corresponding installation position, and it is possible to identify whether the cutting tool at the corresponding installation position is installed abnormally; preferably, in this scheme , an elastic part is provided for the cooperation between the tool and the tool magazine. When the cooperation between the tool and the mounting position is abnormal, the elastic part forces the tool to leave the mounting position. Compared with the situation where the cooperation between the tool and the mounting position is abnormal, the distance between the corresponding three-axis magnetic sensor and the permanent magnet of the tool will increase, and the size and direction of the magnetic field detected by the three-axis magnetic sensor will show obvious abnormalities, which is more conducive to identifying the tool with abnormal cooperation in the mounting position, and is more conducive to avoiding errors in identifying the type of tool due to abnormal cooperation between the mounting position and the tool; specifically, the elastic part can be, for example, a spring fixed to the mounting position, or a coil spring fixed to the mounting position.

[0059] Second embodiment

[0060] Please refer to Figure 7 The object type identification device of this embodiment is an educational stationery, which includes a base 1' and an object 2'. The base 1' includes a shell and a circuit board. The shell includes an upper half shell and a lower half shell. The upper half shell is located on the upper side of the lower half shell. The upper half shell and the lower half shell form an installation cavity. The circuit board is fixed in the installation cavity. The basic component structure of the base 1' can refer to the first embodiment and will not be repeated here.

[0061] The upper surface of the upper half shell has five identification positions distributed along a straight line perpendicular to the vertical direction. The object 2' can be detachably matched with the identification position. Each identification position can be matched with at most one object 2' at the same time. A positioning groove is correspondingly provided at each identification position. The cross-sectional profile shape of the normal line of the positioning groove along the vertical direction is an isosceles triangle.

[0062] There are fifteen types of items 2', each of which represents a number / operator. The fifteen numbers / operators are "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "+", "-", "×", "÷" and "=". The upper surface of each item 2' has a corresponding number / operator mark, which is a visual type mark of the item 2'.

[0063] The cross-sectional profile of the normal line of the object 2' along the vertical direction is an isosceles triangle, and the cross-sectional profile of the normal line of the object 2' along the vertical direction matches the cross-sectional profile of the normal line of the positioning groove along the vertical direction. When the object 2' is matched with the identification position, the object 2' is placed in the corresponding positioning groove, and the positioning groove restricts the object 2' to the corresponding identification position in a preset posture, and restricts the rotation of the object 2' relative to the base 1'.

[0064] The circuit board has five three-axis magnetic sensors corresponding to five identification positions. The object 2' has a permanent magnet. When the object 2' is matched with the identification position, the type of the object 2' is identified according to the direction of the magnetic field vector sensed by the corresponding three-axis magnetic sensor.

[0065] In this way, this embodiment can be used for children to learn arithmetic after combining calculation processing and voice broadcast / digital display. Compared with learning methods such as using tablet computers, this method is conducive to increasing children's interest in arithmetic learning itself and helping children learn happily. It can also prevent children from being exposed to computers / mobile phones too early and from being addicted to the virtual world of computers / mobile phones, which is conducive to the healthy growth of children.

[0066] The positioning groove of this embodiment constitutes a limiting position structure. Optionally, in other embodiments of the present invention, a special positioning protrusion may be added to the bottom of the object, and the cross-sectional profile of the normal line of the positioning protrusion along the vertical direction matches the cross-sectional profile of the positioning groove, and the cross-sectional profile shape of the positioning groove and the object 2' may also be changed, or the object 2' may be limited by the cooperation of more than two groups of positioning protrusions and positioning grooves; in addition, the positions of the positioning protrusion and the positioning groove may also be interchanged, that is, the positioning protrusion may be set at the identification position of the base 1'.

[0067] Alternatively, in other embodiments of the present invention, the device for identifying the type of item may also be other devices and equipment related to culture, education, sports, and art.

[0068] The other parts of this embodiment are the same as those of the first embodiment.

[0069] For example, in this embodiment, the positional relationship between the identification position, the corresponding three-axis magnetic sensor and the object 2' matched with the identification position can be set with reference to the positional relationship between the chess position, the corresponding three-axis magnetic sensor and the chess piece matched with the chess position in the first embodiment, so as to ensure that the type of the object 2' can be identified according to the direction of the magnetic field vector detected by the three-axis magnetic sensor. Specifically, the three-axis magnetic sensor is located directly below the corresponding object 2', and the three-axis magnetic sensor is located directly below the center position of the permanent magnet of the corresponding object 2'. The direction from the south pole to the north pole of the permanent magnet is the fourth direction. The fourth direction of each permanent magnet is perpendicular to the vertical direction. The fourth directions of the permanent magnets of the same type of object 2' are in the same direction. For the same identification position, the fourth direction of the permanent magnet of the object 2' when it cooperates with the identification position is the fourth direction. There are differences between the fourth directions corresponding to any two objects 2'. For example, five identification positions are distributed in sequence along the reference direction M, representing "0", "1", "2", The fourth directions corresponding to the various items 2' of "3", "4", "5", "6", "7", "8", "9", "+", "-", "×", "÷" and "=" are rotated clockwise to the same direction as the reference direction M, and the rotation angle increases in sequence according to an arithmetic progression. The fourth directions corresponding to the various items 2' are perpendicular to the vertical direction, that is, the rotation angle corresponding to the item 2' representing "0" is 0°, the rotation angle corresponding to the item 2' representing "1" is 24°, the rotation angle corresponding to the item 2' representing "2" is 48°, and so on. For the same identification position, the vector direction of the magnetic field generated by the corresponding permanent magnet at the corresponding three-axis magnetic sensor when the item 2' cooperates with the identification position is the first direction, the first directions corresponding to the same type of items 2' are the same, and the first directions corresponding to any two items 2' are different. In this way, when the item 2' is coordinated with the identification position, the type of the item 2' can be identified according to the direction of the magnetic field vector sensed by the corresponding three-axis magnetic sensor.

[0070] Alternatively, in other embodiments of the present invention, the reference direction M may also extend along an arc, or the reference direction M may extend along a curve.

[0071] Optionally, in other embodiments of the present invention, the number of identification bits can be adjusted to accommodate different levels of difficulty in learning operations. Of course, the number of identification bits can also be one, or the identification bits can be multiple and distributed in other ways, such as in two columns.

[0072] For another example, similar to the first embodiment, the first direction corresponding to each object 2' may also have a certain error range, and the size of the error range may be preset.

[0073] Optionally, in other embodiments of the present invention, items 2' representing different numbers / operators may be replaced with items 2' representing different letters. For example, items 2' representing different letters include twenty-six types, namely "a", "b", "c", "d", "e", "f", "g", "h" ... "v", "w", "x", "y", and "z". The type of item 2' is identified according to the direction of the magnetic field vector sensed by the three-axis magnetic sensor. In this way, after combining calculation processing and voice broadcast / digital display (such as an existing calculator), it can be used for children to learn English / pinyin.

[0074] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An object type identification device, comprising a substrate and an object, wherein the substrate has an identification position, the object can be detachably matched with the identification position in a preset posture, and the same identification position can be matched with at most one object at the same time; Features: The base and the object cooperate to form a limiting structure, the limiting structure limits the object to the identification position in the preset posture, and the limiting structure limits the object from rotating relative to the base; The object has a permanent magnet, the substrate is provided with a three-axis magnetic sensor at a position corresponding to the identification position, the three-axis magnetic sensor can be used to detect the direction of the magnetic field, and the center position of the permanent magnet of the object is directly opposite to the corresponding three-axis magnetic sensor along the third direction; The direction from the south pole to the north pole of the permanent magnet is the fourth direction. For the same identification position, the fourth direction of the permanent magnet corresponding to each object when cooperating with the identification position is perpendicular to the third direction, and the fourth directions corresponding to any two objects are different. When the component of the magnetic field detected by the three-axis magnetic sensor in the third direction is greater than or equal to a preset first threshold, determining that the base and the object are abnormally matched; or when the angle between the magnetic field direction detected by the three-axis magnetic sensor and the third direction exceeds a preset angle range, determining that the base and the object are abnormally matched; When it is not determined that the base and the object are abnormally matched, the object type identification device identifies the type of the object matched to the identification position according to the direction of the magnetic field detected by the three-axis magnetic sensor; The device for identifying the type of article further comprises a status prompt unit, wherein the status prompt unit is communicatively connected to the three-axis magnetic sensor; When it is determined that the base and the article are abnormally matched, the corresponding status prompt unit sends out a prompt message.

2. The article type identification device according to claim 1, characterized in that: The three-axis magnetic sensor can be used to detect the size of the magnetic field. When the angle between the direction of the magnetic field detected by the three-axis magnetic sensor and the third direction exceeds a preset angle range, and the size of the magnetic field detected by the three-axis magnetic sensor is greater than or equal to a preset second threshold, it is determined that the substrate and the object are abnormally matched.

3. The device for identifying the type of article according to claim 1, characterized in that: The three-axis magnetic sensor can be used to detect the size of the magnetic field. When it is not determined that the substrate and the object are abnormally matched, and the size of the magnetic field detected by the three-axis magnetic sensor is greater than or equal to a preset second threshold, the object type identification device identifies the type of the object matched to the identification position based on the direction of the magnetic field detected by the three-axis magnetic sensor.

4. The article type identification device according to claim 1, characterized in that: The positioning structure includes a concave-convex matching structure; and / or the positioning structure includes a magnetic positioning structure.

5. The device for identifying the type of article according to any one of claims 1 to 4, characterized in that: The three-axis magnetic sensor can be used to detect the vector direction of the magnetic field; or the three-axis magnetic sensor can be used to detect the direction of a straight line parallel to the magnetic field vector, and for the same identification position, the fourth directions corresponding to any two items are not parallel to each other; The three-axis magnetic sensor includes a magnetic sensor chip; The object can be detachably matched to the corresponding identification position along the third direction.

6. The device for identifying the type of article according to any one of claims 1 to 4, characterized in that: The substrate has a first mating surface at the identification position, and the object has a second mating surface, the first mating surface is in contact with the corresponding second mating surface of the object, and the normal line of the first mating surface and the normal line of the corresponding second mating surface of the object are both along the third direction.

7. The device for identifying the type of article according to any one of claims 1 to 4, characterized in that: The article type identification device is a tool library, which includes tools and a storage rack for storing the tools, the base is the storage rack, and the articles are the tools.

8. The device for identifying the type of article according to any one of claims 1 to 4, characterized in that: The base is detachably fixedly connected to the article, and an elastic member is arranged between the base and the article. When the article and the identification position are abnormally matched, the elastic member forces the article to move in a direction away from the identification position.

9. The device for identifying the type of article according to any one of claims 1 to 4, characterized in that: The status prompt unit is a status indicator light / sound prompt device; When it is determined that the substrate and the object are in a matching state, the state prompting unit issues prompting information that the object and the substrate are in a matching state.

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