Article in-place detection method and sensor based on magnetic loop closing triggering

Abstract

The invention relates to the technical field of article in-place state analysis, in particular to an article in-place detection method and sensor based on magnetic loop closing triggering, and the method comprises the steps: detecting a magnetic conductive article based on a preset magnetic loop sensor; when there is no magnetic conductive object, the preset magnetic loop sensor is in an untriggered state; when the magnetic conductive object is detected, the preset magnetic loop sensor is in a triggered state; the preset magnetic loop sensor comprises a permanent magnet, a main control circuit and a magneto-dependent sensor; a first magnet and a second magnet of the permanent magnet are arranged at an interval; the magneto-dependent sensor is connected with the main control circuit through a line; the magneto-dependent sensor is located below or above the interval position of the first magnet and the second magnet. According to the invention, the step and cost of mounting a magnet on the tool are saved, and the problems that the prior art lacks systematic guide and optimization design for a magnetic circuit and cannot ensure that the magnetic field intensity of the position where the sensor is located cannot be stably and obviously changed when the tool is placed are solved.

Description

Technical Field

[0001] This invention relates to the field of in-situ status analysis technology, specifically to an in-situ detection method and sensor based on magnetic circuit closure triggering. Background Technology

[0002] Currently, traditional methods for detecting the presence of small metal tools or objects often employ magnetic components such as reed switches and Hall effect sensors. The principle behind these traditional methods is to fix a magnet to the tool and a sensor (such as a reed switch) to its storage location. When the tool is returned to its storage position, the magnet approaches the sensor, causing a change in the sensor's state, indicating that the tool has been returned to its proper place. However, this method has significant drawbacks: it requires installing a magnet on each metal tool, resulting in high cost, complex structure, and the magnets are prone to detachment.

[0003] One improved approach to the sensor involves placing a magnet and a sensor at the location where the object is stored. The magnetic properties of the tool itself (such as a steel wrench) alter the magnetic field distribution at the object's location, triggering the sensor. However, this approach suffers from low sensitivity and poor reliability in practical applications. The root causes include: First, magnetic field dispersion. The magnet's magnetic field disperses into the surrounding space, resulting in a lack of energy concentration and a short effective range. Second, detection logic errors. Simply placing the tool between the magnet and the sensor can cause the highly magnetically permeable tool to act as a "magnetic shield," attracting the magnetic field lines and weakening, rather than strengthening, the magnetic field at the sensor, thus failing to trigger the sensor effectively.

[0004] Third, existing technologies lack a systematic design for guiding and optimizing the magnetic circuit, failing to ensure a stable and significant change in the magnetic field strength at the sensor's location when the tool is placed. In summary, there is an urgent need in the field for an in-situ detection solution that requires no additional components to the tool, offers high detection sensitivity, high reliability, and low cost. Therefore, the present invention provides a method and sensor for detecting the presence of an object based on magnetic circuit closure triggering, in order to solve the above problems. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a method and sensor for detecting the presence of an object based on magnetic circuit closure triggering, so as to solve the problem that the prior art lacks a systematic design for guiding and optimizing the magnetic circuit, and cannot ensure that the magnetic field strength at the sensor location can be stably and significantly changed when the tool is placed.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a method for detecting the presence of an article based on magnetic circuit closure triggering, comprising: detecting a magnetically conductive article based on a preset magnetic circuit sensor; When there are no magnetically conductive items, the preset magnetic circuit sensor is in an untriggered state; When a magnetically conductive object is detected, the preset magnetic circuit sensor is triggered.

[0007] Secondly, the present invention provides a sensor, wherein the preset magnetic circuit sensor includes a permanent magnet, a main control circuit, and a magnetic sensor. The permanent magnet includes one or more magnets, which are spaced apart. The magnetic sensor and the main control circuit are connected by a line. The magnetic sensor is located below or above the spaced positions of the magnets.

[0008] Preferably, the preset magnetic circuit sensor includes a permanent magnet, a main control circuit, and a magnetic sensor. The permanent magnet includes a first magnet and a second magnet, which are spaced apart. The magnetic sensor and the main control circuit are connected by a line. The magnetic sensor is located below or above the spaced position between the first magnet and the second magnet.

[0009] Preferably, the preset magnetic circuit sensor includes a permanent magnet, a main control circuit, and a magnetic sensor. The permanent magnet includes a first magnet and a second magnet, which are spaced apart. Both ends of the first magnet and the second magnet have pointed tips. The magnetic sensor and the main control circuit are connected by a circuit. The magnetic sensor is located below or above the spaced position between the first magnet and the second magnet; or one magnetic sensor is located above or below the spaced position between the two pointed tips of the first magnet, and the other magnetic sensor is located above or below the spaced position between the two pointed tips of the second magnet.

[0010] Preferably, the preset magnetic circuit sensor includes: a magnetic circuit base, a back iron, a permanent magnet, a pole shoe structure, a magnetic sensor, and a main control circuit; the back iron is in close contact with the surface of the permanent magnet and the magnetic sensor, and is used to collect and constrain the magnetic lines of force emitted by the permanent magnet; the pole shoe structure is connected to the back iron and / or the main body of the permanent magnet, and the pole shoe structure forms the end of the permanent magnet, and is used to concentrate the magnetic lines of force to the tip or a specific working surface of the permanent magnet; the magnetic circuit base is used to support and fix the permanent magnet, the back iron, the permanent magnet, the pole shoe structure, and the magnetic sensor; the main control circuit is connected to the magnetic sensor through a circuit.

[0011] Preferably, the magnet has a C-shaped structure; or, the magnet has a U-shaped structure.

[0012] Preferably, the magnetic sensor is a reed switch.

[0013] Preferably, the pole shoe structure is pointed or has small rounded corners and is made of a magnetically conductive material.

[0014] Preferably, the back iron is made of a magnetically conductive material.

[0015] Preferably, a non-magnetic material cover is provided between the preset magnetic circuit sensor and the item to be detected.

[0016] The beneficial effects of this invention are as follows: 1. The detection method of this invention eliminates the need to install any additional components on the item to be detected. It utilizes the magnetic properties of the metal item itself and achieves highly reliable and sensitive in-situ detection through ingenious magnetic circuit design. This eliminates the step and cost of installing magnets on the tool. It is particularly suitable for occasions such as smart cabinets, smart shelves, and smart surgical instrument management that require accurate sensing of the in-situ status of metal tools or items. This solves the problem of existing technologies lacking systematic guidance and optimization of the magnetic circuit design, which cannot ensure that the magnetic field strength at the sensor location can be stably and significantly changed when the tool is placed.

[0017] 2. Due to the strong concentrated magnetic field formed between the magnetic field lines and pole pieces, the tool can usually be reliably triggered even with a positional deviation of ±5mm. This invention has high fault tolerance, is insensitive to the tool's placement, and effectively prevents accidental triggering.

[0018] 3. The magnetic circuit structure of the present invention is simple and low in cost. The core components are all conventional permanent magnets, magnetic conductive materials and reed switches, which are easy to mass-produce and apply. Attached Figure Description

[0019] Figure 1 This is a schematic flowchart of an in-situ detection method for an item based on magnetic circuit closure triggering according to the present invention; Figure 2 This is a schematic structural diagram from a first-view perspective of a preset magnetic circuit sensor for in-situ detection of an object based on magnetic circuit closure triggering according to the present invention. Figure 3 This is a schematic structural diagram from a second perspective of a preset magnetic circuit sensor for in-situ detection of an object based on magnetic circuit closure triggering according to the present invention. Figure 4 This is a schematic structural diagram from a third-view perspective of a preset magnetic circuit sensor for in-situ detection of an object based on magnetic circuit closure triggering according to the present invention. Figure 5 This is a schematic structural diagram from the fourth perspective of a preset magnetic circuit sensor for in-situ detection of an object based on magnetic circuit closure triggering according to the present invention. Figure 6 and Figure 7 This is a schematic diagram showing the placement of magnetically conductive objects from different perspectives.

[0020] In the diagram, A is the first magnet, E is the second magnet, C is the magnetic sensor, D is a magnetically conductive object, and F is the main control circuit. Figure 6 and Figure 7Different types of magnetically conductive items are displayed inside. Detailed Implementation

[0021] The following will refer to the attached reference. Figure 1 To be continued Figure 7 The various embodiments of the present invention will be described in detail below. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0022] A method for detecting the presence of an item based on magnetic circuit closure triggering, as shown in the attached figure. Figure 1 To be continued Figure 5 As shown, it includes the following steps: Step S1: Detect magnetically conductive items based on a preset magnetic circuit sensor.

[0023] When the main control circuit is in normal condition and the power supply to the main control circuit is normal, the state of the preset magnetic circuit sensor is determined by the opening or closing of the magnetic sensor.

[0024] Step S2: When there are no magnetically conductive items, the preset magnetic circuit sensor is in an untriggered state.

[0025] When a non-magnetic item is stored, the magnetic sensor is in an off state, and the preset magnetic circuit sensor formed by the magnetic sensor is in an untriggered state.

[0026] Step S3: When a magnetically conductive object is detected, the preset magnetic circuit sensor is triggered.

[0027] When a magnetically conductive object is detected to be stored, the magnetic sensor is in a closed state, and the preset magnetic circuit sensor formed by the magnetic sensor is in a triggered state.

[0028] Specifically, a method for detecting the presence of an item based on magnetic circuit closure triggering uses a pre-set, incomplete magnetic circuit system to detect the presence of a magnetically conductive item.

[0029] The preset magnetic circuit sensor includes a permanent magnet, a main control circuit, and a magnetic sensor. The permanent magnet includes one or more magnets, which are spaced apart. The magnetic sensor and the main control circuit are connected by a line. The magnetic sensor is located below or above the spaced positions of each magnet.

[0030] The preset magnetic circuit sensor includes a permanent magnet, a main control circuit, and a magnetic sensor. The permanent magnet is a magnetic circuit structure that guides and concentrates magnetic lines of force. The magnetic sensor is a sensor that detects changes in magnetic force, such as a reed switch. In the absence of a magnetically conductive object, the magnetic sensor is in an untriggered state. For example, when the magnetic sensor is a reed switch, the reed switch is in an open state, and consequently, the preset magnetic circuit sensor is also in an open state, i.e., an untriggered state.

[0031] In one example, as shown in the attached document Figure 2 -Appendix Figure 5 As shown, A is the first magnet, E is the second magnet, C is the magnetic sensor, mainly a reed switch, D is a magnetically conductive object, and F is the main control circuit, including the power supply, microcontroller and other circuit structures.

[0032] The main process of the detection method is as follows: when the magnetically conductive object to be detected is placed at the designated detection position, the magnetically conductive object is not inserted between the magnet and the sensor, but rather spans and overlaps the two magnetic pole regions that are specially preset in the magnetic circuit structure. The magnetically conductive object itself acts as a magnetic bridge, instantly closing a magnetic circuit that was originally open and had high magnetic resistance, forming a complete magnetic circuit with low magnetic resistance.

[0033] The direct effect of closing the magnetic circuit is that the total magnetic flux of the entire system increases sharply, and the guided magnetic lines of force concentrate through the magnetic sensor located at the key node of the magnetic circuit, resulting in a significant increase in the local magnetic field strength at that location, thereby reliably triggering the magnetic sensor and causing it to close.

[0034] Using the above method, this invention eliminates the need for any additional components on the item to be detected. Utilizing the inherent magnetic properties of the metal object itself, and through a clever magnetic circuit design, it achieves highly reliable and sensitive in-situ detection, saving the step and cost of installing magnets on the tool. This is particularly suitable for applications requiring precise sensing of the in-situ status of metal tools or items, such as smart cabinets, smart shelves, and smart surgical instrument management. Furthermore, the magnetic circuit structure of this invention is simple and inexpensive, with core components consisting of conventional permanent magnets, magnetically conductive materials, and reed switches, making it easy to mass-produce and apply.

[0035] Furthermore, in one embodiment of the present invention, the preset magnetic circuit sensor includes a permanent magnet, a main control circuit, and a magnetic sensor. The permanent magnet includes a first magnet and a second magnet, which are spaced apart. Both the first and second magnets are strip-shaped. The magnetic sensor and the main control circuit are connected by a circuit. The magnetic sensor is located at a predetermined position in a space below or above the space between the first and second magnets. The size of the predetermined space is determined by the magnetism of the permanent magnet; the higher the magnetism, the larger the range of the predetermined space.

[0036] The magnetic sensor and the main control circuit are connected by a line. There can be at least one, two or more. As long as one of the magnetic sensors is closed, it means that there is a magnetically conductive object stored at the storage location detected by the magnetic sensor.

[0037] Using the above method, this invention eliminates the need for any additional components on the item to be detected. Utilizing the inherent magnetic properties of the metal object itself, and through a clever magnetic circuit design, it achieves highly reliable and sensitive in-situ detection, saving the step and cost of installing magnets on the tool. This is particularly suitable for applications requiring precise sensing of the in-situ status of metal tools or items, such as smart cabinets, smart shelves, and smart surgical instrument management. Furthermore, the magnetic circuit structure of this invention is simple and inexpensive, with core components consisting of conventional permanent magnets, magnetically conductive materials, and reed switches, making it easy to mass-produce and apply.

[0038] Furthermore, in one embodiment of the present invention, the preset magnetic circuit sensor includes a permanent magnet, a main control circuit, and a magnetic sensor. The permanent magnet includes a first magnet and a second magnet, which are spaced apart. Both ends of the first magnet and the second magnet are provided with sharp points. The magnetic sensor and the main control circuit are connected by a line, wherein at least one magnetic sensor is provided. In the first scenario, one or two magnetic sensors are located at a predetermined position below or above the space between the first and second magnets. The size of the predetermined space is determined by the magnetism of the permanent magnets; the stronger the magnetism, the larger the predetermined space.

[0039] The second scenario involves having two magnetic sensors: one located above or below the two tips of the first magnet, and the other located above or below the two tips of the second magnet.

[0040] In one embodiment of the present invention, to improve the accuracy of the detection results, the magnetic sensor is attached to the permanent magnet, that is, the magnetic sensor is disposed above or below the permanent magnet at the interval position; when the magnetic sensor is located above the permanent magnet interval position, the bottom of the magnetic sensor and the upper surface of the permanent magnet are approximately on the same horizontal plane. When the magnetic sensor is located below the permanent magnet interval position, the upper part of the magnetic sensor and the lower surface of the permanent magnet are approximately on the same horizontal plane.

[0041] Furthermore, in one embodiment of the present invention, the first magnet and / or the second magnet has a C-shaped structure; or, the first magnet and / or the second magnet has a U-shaped structure.

[0042] The combination methods include: first, both the first magnet and the second magnet have a C-shaped structure; second, both the first magnet and the second magnet have a U-shaped structure; third, the first magnet has a C-shaped structure and the second magnet has a U-shaped structure; and fourth, the first magnet has a U-shaped structure and the second magnet has a C-shaped structure.

[0043] Because a strong concentrated magnetic field is formed between the tips of the first magnet and between the tips of the second magnet, the tool can usually be reliably triggered even with a positional deviation of ±5mm. This invention has high fault tolerance, is insensitive to the tool's placement, and effectively prevents accidental triggering.

[0044] In one embodiment of the present invention, a preset magnetic circuit sensor, namely a magnetic circuit closure triggered sensor, includes: a magnetic circuit base, a back iron, a permanent magnet, a pole shoe structure, a magnetic sensor, and a main control circuit; the back iron is in close contact with a surface of the permanent magnet and the magnetic sensor, and is used to collect and constrain the magnetic lines of force emitted by the permanent magnet; the pole shoe structure is connected to the back iron and is located at the tip of the permanent magnet, and is used to concentrate the magnetic lines of force to the tip or a specific working surface of the permanent magnet; the magnetic circuit base is used to support and fix the permanent magnet, the back iron, the permanent magnet, the pole shoe structure, and the magnetic sensor; the main control circuit is connected to the magnetic sensor via a circuit.

[0045] Specifically, the magnetic circuit base is used to support and fix the various components; the permanent magnet is used to provide a stable magnetic field source. The back iron is made of a high-permeability material (such as low-carbon steel) and is closely attached to one of the main surfaces of the permanent magnet to collect and confine the magnetic field lines emanating from that surface, preventing the waste of magnetic field energy.

[0046] The pole shoe structure is made of a highly permeable magnetic material and is ferromagnetically connected to the backbone and / or back of the permanent magnet. The pole shoe structure includes two or more spatially separated magnetic pole regions, for example, attached... Figure 2 The permanent magnet has four tips, each exhibiting either N-pole or S-pole characteristics. The function of the pole shoe structure is to concentrate the magnetic field lines from the broad surface of the magnet to its tips or specific action surfaces.

[0047] The magnetic sensor is fixedly mounted near one of its tips to detect changes in magnetic field strength at that location. Its orientation should align its sensing direction with the direction of the expected increase in magnetic field strength; for example, when the magnetic sensor is a reed switch, the major axis of the reed switch should be parallel to the direction of the magnetic field lines.

[0048] The space between the tips (interval positions) constitutes a detection area for magnetic field changes. When a magnetically conductive object crosses this detection area and simultaneously contacts or approaches at least one of the tips, the magnetic field in the detection area changes, the magnetic sensor closes, and the magnetic circuit closes, thereby triggering a preset magnetic circuit sensor.

[0049] Furthermore, in one embodiment of the invention, the permanent magnet comprises two magnets, each magnet having a C-shaped or U-shaped structure, with its two ends made of a magnetically conductive material. This C-shaped or U-shaped structure most effectively confines magnetic lines of force between the ends of the magnets.

[0050] The end of the permanent magnet can be made into a pointed or rounded shape to further concentrate the magnetic field lines and increase the local field strength.

[0051] In one embodiment of the present invention, the magnetic sensor is a reed switch with a sensitivity (engagement ampere-turns AT) of 10-15 AT. To improve detection reliability, a magnetic sensor can be installed between each end of the magnet, and a logical OR circuit is used for judgment. If any sensor is triggered, the object is considered to be in place. This solves the detection problem when the object only has good contact with one side of the pole shoe. Further, in one embodiment of the present invention, a non-magnetic material cover plate (such as PC or ABS, 0.8-1.2 mm thick) can be placed between the preset magnetic circuit sensor and the object to be detected to protect the internal structure of the preset magnetic circuit sensor. During final calibration, the detection space of the preset magnetic circuit sensor is considered based on the influence of the cover plate.

[0052] As attached Figure 6 and attached Figure 7 As shown, Figure 6 and Figure 7 Different types of magnetically conductive items are placed inside. The cover plate has storage locations for magnetically conductive tools. Each storage location has a preset magnetic circuit sensor underneath, and the detection of magnetically conductive items in each storage location does not interfere with each other.

[0053] By employing the pre-set magnetic circuit sensor of this invention, a significant, rather than slight, increase in the magnetic field at the sensor is achieved through a closed magnetic bridge circuit. This results in highly stable triggering, strong anti-interference capabilities, and high sensitivity and reliability. Furthermore, the magnetically conductive tool requires no modification, utilizing its own inherent magnetism to eliminate the need for installing magnets on the tool, thus achieving true passive detection.

[0054] This invention fundamentally solves the problem of detection failure caused by the magnetic shielding effect of highly magnetic tools. It utilizes the magnetic conductivity of the tool to trigger the detection by conducting the magnetic circuit.

[0055] Because the magnetic lines of force form a strong concentrated magnetic field between the ends of the permanent magnet, the tool can usually be reliably triggered even if there is a positional deviation of ±5mm when it is placed, and it has good fault tolerance.

[0056] The core components are all conventional permanent magnets, magnetic materials and reed switches, which are simple in structure, low in cost and easy to mass-produce and apply.

[0057] In one embodiment of the present invention, the preset magnetic circuit sensor includes a plastic base. An NdFeB permanent magnet, measuring 10mm × 3mm × 2mm and grade N35 or N52, is fixed on the plastic base. A back iron, made of low-carbon steel and measuring 15mm × 10mm × 0.8mm, is attached to the back of the permanent magnet (the side furthest from the detection area).

[0058] The ends of a C-shaped permanent magnet are stamped from silicon steel sheets, with a 12mm gap between the two ends. The ends also have small rounded corners. The ends of this permanent magnet are magnetically connected to the front and sides of the main body of the permanent magnet.

[0059] A normally open reed switch with a sensitivity of 12AT is fixed on a plastic base, with its major axis parallel to the magnetic field lines on the side of the permanent magnet end, and the distance between it and the side of the permanent magnet end is adjusted to about 1.5mm. When no magnetically conductive object is placed across the end of the permanent magnet, the reed switch is brought to a critical state of "just not engaging" by finely adjusting the position of the reed switch or the relative position of the magnetic circuit components. Finally, a 1.0mm thick PC material cover plate (8) is used to cover the entire structure.

[0060] In one embodiment of the invention, when a steel screwdriver (magnetic object) is placed in the holder, and its metal head simultaneously contacts or approaches the end of the magnet, a low-resistivity closed magnetic circuit is formed. The circuit path is: one end of the permanent magnet -> screwdriver -> pole shoe B -> one end of the permanent magnet, while the back iron ensures the closure of the rear of the magnetic circuit. This closed circuit causes a significant increase in the total magnetic flux of the system, strongly penetrating the reed switch, magnetizing and attracting the two contacts of the reed switch, thereby activating the circuit of the preset magnetic circuit sensor and outputting a tool-in-position signal.

[0061] When the screwdriver is removed, the magnetic circuit returns to a high magnetic resistance open state, the magnetic flux flowing through the reed switch decays rapidly, and the reed switch breaks under its own elastic force, which in turn disconnects the detection circuit of the preset magnetic circuit sensor, thereby outputting a tool removal signal.

[0062] In actual verification, the preset magnetic circuit sensor of this invention achieved a 100% trigger success rate when placed in the center of a magnetically conductive tool. Even with a tool offset of ±5mm in the front-back and left-right directions, the trigger success rate still exceeded 95%. After adding a cover plate, the performance did not significantly decrease by finely adjusting the magnetic circuit height, and it triggered without error during light vibration testing, fully demonstrating the effectiveness, reliability, and robustness of this invention.

[0063] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0064] It should be noted that in the description of this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0065] The program code used to implement the methods of this disclosure may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus, such that when executed by the processor or controller, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0066] In the context of this disclosure, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0067] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the computer. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0068] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as a data server), or computing systems that include middleware components (e.g., an application server), or computing systems that include frontend components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., a communication network). Examples of communication networks include local area networks (LANs), wide area networks (WANs), and the Internet.

[0069] Computer systems can include clients and servers. Clients and servers are generally located far apart and typically interact via communication networks. Client-server relationships are created by computer programs running on the respective computers and having a client-server relationship with each other. Servers can be cloud servers, servers in distributed systems, or servers incorporating blockchain technology.

[0070] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A method for detecting the presence of an item based on magnetic circuit closure triggering, characterized in that, include: Detection of magnetically conductive items based on a preset magnetic circuit sensor; When there are no magnetically conductive items, the preset magnetic circuit sensor is in an untriggered state; When a magnetically conductive object is detected, the preset magnetic circuit sensor is triggered.

2. A preset magnetic circuit sensor, characterized in that, The preset magnetic circuit sensor includes a permanent magnet, a main control circuit, and a magnetic sensor. The permanent magnet includes one or more magnets, which are spaced apart. The magnetic sensor and the main control circuit are connected by a line. The magnetic sensor is located below or above the spaced positions of each magnet.

3. The preset magnetic circuit sensor according to claim 2, characterized in that, The preset magnetic circuit sensor includes a permanent magnet, a main control circuit, and a magnetic sensor. The permanent magnet includes a first magnet and a second magnet, which are spaced apart. The magnetic sensor and the main control circuit are connected by a line. The magnetic sensor is located below or above the spaced position between the first magnet and the second magnet.

4. The preset magnetic circuit sensor according to claim 2, characterized in that, The preset magnetic circuit sensor includes a permanent magnet, a main control circuit, and a magnetic sensor. The permanent magnet includes a first magnet and a second magnet, which are spaced apart. Both ends of the first magnet and the second magnet are provided with sharp points. The magnetic sensor and the main control circuit are connected by a circuit. The magnetic sensor is located below or above the space between the first magnet and the second magnet; or one magnetic sensor is located above or below the space between the two tips of the first magnet, and the other magnetic sensor is located above or below the space between the two tips of the second magnet.

5. The preset magnetic circuit sensor according to claim 2, characterized in that, The preset magnetic circuit sensor includes: a magnetic circuit base, a back iron, a permanent magnet, a pole shoe structure, a magnetic sensor, and a main control circuit; the back iron is closely attached to a surface of the permanent magnet and the magnetic sensor, and is used to collect and constrain the magnetic lines of force emitted by the permanent magnet; the pole shoe structure is connected to the back iron and / or the main body of the permanent magnet, and the pole shoe structure forms the end of the permanent magnet, and is used to concentrate the magnetic lines of force to the tip or a specific working surface of the permanent magnet. The magnetic circuit base is used to support and fix the permanent magnet, back iron, permanent magnet, pole shoe structure and magnetic sensor; the main control circuit is connected to the magnetic sensor through a line.

6. The preset magnetic circuit sensor according to claim 2, characterized in that, The magnet has a C-shaped structure; or, the magnet has a U-shaped structure.

7. The preset magnetic circuit sensor according to claim 2, characterized in that, The magnetic sensor is a reed switch.

8. The preset magnetic circuit sensor according to claim 5, characterized in that, The pole shoe structure is pointed or has small rounded corners and is made of magnetically conductive material.

9. The preset magnetic circuit sensor according to claim 5, characterized in that, The back iron is made of a magnetically conductive material.

10. The preset magnetic circuit sensor according to claim 5, characterized in that, A non-magnetic material cover is provided between the preset magnetic circuit sensor and the item to be detected.

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