A self-powered alarm anti-theft door

Abstract

A self-powered alarm security door belongs to the field of new energy and security door technology. It consists of a door body, a door frame, a trigger, and an alarm. The trigger consists of a trigger housing and an installed trigger magnet. The alarm consists of an alarm housing, an alarm cover, an electronic control board, a coil, and a generator magnet. The bottom, outer wall, and inner wall of the alarm housing form a linear cavity, and the bottom and inner wall of the housing form a magnetic cavity. The cover plate and cover wall of the alarm cover form a cover cavity. The alarm cover is mounted on the alarm housing and encapsulates the coil and generator magnet in the linear cavity and magnetic cavity, respectively. The electronic control board is mounted in the cover cavity. The door body is mounted on the door frame via hinges, and the trigger and alarm are mounted on the door body and door frame, respectively, or the trigger and alarm are mounted on the door frame and door body, respectively. During operation, the trigger forces the generator magnet to flip its magnetic poles, causing the coil to cut through the magnetic lines of force to generate electricity. After conversion and processing, the electrical energy is supplied to an information processing and transmitting unit, which transmits door movement information to a receiving end.

Description

Technical Field

[0001] The invention belongs to the technical field of new energy and anti-theft doors, and particularly relates to an anti-theft door with self-powered alarm. Background Art

[0002] Security doors have become the last line of defense in modern homes. They must be able to resist unauthorized opening under certain conditions and for a certain period of time. This is a fundamental function and a required standard for security doors. With technological advancements and evolving consumer needs, security doors and their control systems are increasingly becoming more intelligent and convenient. Smart door locks with features like alarms and notifications upon opening, timeout alarms, and fingerprint, password, or IC card controls have gained widespread adoption. However, these existing smart security door control systems rely on batteries or cables for power. If the batteries run out or a power outage occurs, the control system will malfunction, potentially posing a safety hazard. Therefore, security doors with self-generated power, or various smart security door control systems powered by self-generated power, are becoming a future trend. Summary of the Invention

[0003] The present invention provides a self-powered alarm anti-theft door composed of a door body, a door frame, a door lock, a trigger and an alarm. The trigger consists of a trigger shell and a trigger magnet installed thereon. The trigger magnet is embedded in the inside of the trigger shell or installed on the trigger shell via screws. The alarm consists of an alarm shell, an alarm cover, an electric control board, a coil and a generating magnet. The electric control board is provided with an energy collection and management unit and an information processing and transmitting unit.

[0004] The alarm shell is composed of a shell bottom, a shell outer wall and a shell inner wall. The shell inner wall and the shell outer wall are located on the same side of the shell bottom. The shell inner wall is shorter than the shell outer wall and is located inside the shell outer wall. The shell bottom, the shell outer wall and the shell inner wall form a linear cavity, and the shell bottom and the shell inner wall form a magnetic cavity. The linear cavity is a circular ring cavity, a square ring cavity or a rectangular ring cavity, and the magnetic cavity is a circular cavity, a square cavity or a rectangular cavity. The shape of the linear cavity and the magnetic cavity refers to the shape of their projection on the shell bottom; the alarm cover is composed of a cover plate and a cover wall, and the cover plate and the cover wall form a cover cavity.

[0005] The alarm cover is installed on the alarm shell by screws, and the coil and the generating magnet are respectively encapsulated in the wire cavity and the magnetic cavity through the partition. The generating magnet is located inside the coil, and the electric control board is installed in the cover cavity by screws; the cover plate of the alarm cover is installed at the end of the outer wall of the alarm shell by screws, and the cover wall presses the partition to the end of the inner wall of the shell. The partition encapsulates the coil and the generating magnet in the wire cavity and the magnetic cavity respectively, and the coil is fixed in the wire cavity, and the generating magnet can roll freely in the magnetic cavity; the generating magnet is a sphere, a cylinder or a cuboid, and the cylindrical generating magnet is monopolar radially magnetized and has only one pair of radially configured magnetic poles, that is, only one N pole and an S pole; the axis of the cylindrical power-generating magnet is perpendicular to the axis of the coil, and the coil is coaxial with the magnetic cavity, that is, the axis of the coil overlaps with the axis of the magnetic cavity; the surface of the spherical and cylindrical power-generating magnets is exposed or provided with a protective layer of polymer material; the rectangular power-generating magnet is embedded in the cylinder made of polymer material and its magnetic poles are distributed along the radial direction of the cylinder in which it is located; the axis of the rectangular power-generating magnet, that is, the axis of the cylinder in which the rectangular power-generating magnet is located, is perpendicular to the axis of the coil, and the polymer material is polytetrafluoroethylene; the coil and the power-generating magnet inside it constitute a transducer, and the trigger magnet and the transducer constitute a power generation unit.

[0006] The door body is installed on the door frame via hinges, the trigger and the alarm are installed on the door body and the door frame respectively, or the trigger and the alarm are installed on the door frame and the door body respectively, the trigger and the alarm are embedded in the door body or the door frame, the trigger and the alarm are installed on two mutually close and opposite sides of the door body and the door frame, and the geometric center of the trigger magnet and the geometric center of the power generating magnet are located on the same horizontal plane; the installed trigger and alarm constitute a self-powered opening and closing trigger alarm system.

[0007] The trigger contains at least one trigger magnet, and the trigger contains at least one pair of trigger magnetic poles. Two adjacent opposite-pole magnetic poles located in the same horizontal plane in the trigger constitute a pair of trigger magnetic poles, that is, two adjacent N poles and S poles on the relative motion path of the trigger and the alarm constitute a pair of trigger magnetic poles; the two magnetic poles in the pair of trigger magnetic poles are opposite-pole magnetic poles of the same trigger magnet, that is, the N pole and the S pole; or the two magnetic poles in a pair of trigger magnetic poles are respectively opposite-pole magnetic poles of two adjacent trigger magnets, that is, the N pole of one trigger magnet and the S pole of another trigger magnet adjacent to it constitute a pair of trigger magnetic poles.

[0008] When the trigger contains only one trigger magnet, the magnetic poles of the trigger magnet are arranged along the front-to-back direction of the door, that is, along the thickness direction of the door body when it is closed. The line connecting the magnetic poles of the trigger magnet is located in the tangent direction of the motion trajectory of the outer edge of the door body, that is, the magnetic poles of the trigger magnet are arranged on the path of relative motion between the trigger and the excitation alarm. During the opening and closing movement of the door body, the alarm moves from one magnetic pole of the trigger magnet to the other magnetic pole, or the two magnetic poles of the trigger magnet pass through the alarm in sequence.

[0009] When the trigger contains multiple trigger magnets, each trigger magnet is arranged on the same horizontal plane along the front-to-back direction of the door and the magnetic poles of two adjacent trigger magnets are arranged in opposite directions. The magnetic poles of each trigger magnet are arranged along the left-right direction of the door, or the normal direction of the movement trajectory of the outer edge of the door body, that is, the line connecting the magnetic poles of each trigger magnet itself is along the left-right direction of the door, or the normal direction of the movement trajectory of the outer edge of the door body. The left-right direction of the door refers to the width direction of the door body when it is closed; during the opening and closing movement of the door body, the alarm passes by one magnetic pole of each trigger magnet in turn, or one magnetic pole of each trigger magnet passes by the alarm in turn.

[0010] During operation, that is, during the opening and closing process of the anti-theft door, the distance between the trigger and the alarm changes from near to far or from far to near, and the trigger forces the magnetic poles of the power-generating magnet in the alarm to flip, that is, the two adjacent opposite magnetic poles of the triggering magnet in the trigger force the magnetic poles of the power-generating magnet in the alarm to flip, that is, the direction of the magnetic lines of force of the power-generating magnet in the coil is flipped, and the coil cuts the magnetic lines of force to generate electricity. After conversion and processing, the electrical energy is supplied to the information processing and transmitting unit, and the transmitting unit transmits the door opening or closing action information to the receiving terminal, which is an Internet of Things terminal, a mobile phone or an indoor doorbell receiving terminal.

[0011] Taking the movement process of the door from closing to opening as an example, the working principle and process of the trigger and alarm are as follows.

[0012] In the door closing state, that is, the door body and the door frame are in the closed state, the trigger and the alarm are facing each other and the distance between them is the shortest, the generating magnet is closest to one pole of a single trigger magnet or closest to one pole of a trigger magnet among multiple trigger magnets, and a mutual attraction is generated between the generating magnet and the opposite magnetic poles of the trigger magnet it is close to; in the initial state: the N pole of the generating magnet is close to the S pole of the trigger magnet it is close to and attracts each other, and the N pole of the generating magnet points to the trigger.

[0013] During the door opening process, that is, the process of the door body moving away from the door frame, the S pole of the triggering magnet gradually moves away from the generating magnet, and the N pole of the triggering magnet gradually approaches the generating magnet. The force exerted by the S pole of the triggering magnet on the generating magnet gradually decreases, and the force exerted by the N pole of the triggering magnet gradually increases. When the distance between the generating magnet and the N pole of the triggering magnet is smaller than the distance between the S poles, the magnetic poles of the generating magnet flip, and the S pole of the generating magnet and the N pole of the triggering magnet it is close to attract each other, and the S pole of the generating magnet points to the trigger.

[0014] In the present invention, the trigger includes at least one group of trigger magnets, each group includes at least one trigger magnet, and the alarm includes at least one transducer consisting of a power generation magnet and a coil. The number of groups of trigger magnets is equal to the number of transducers.

[0015] In the present invention, except for the trigger magnet and the generating magnet, other components in the trigger and the alarm are made of non-ferromagnetic materials, and the non-ferromagnetic materials include metals such as stainless steel, aluminum alloy and copper, and polymer plastics; there is no coupling effect between the generating magnet and the door body and door frame, and there is no magnetic coupling force between the generating magnet and the door body and door frame.

[0016] In the present invention, to achieve optimal power generation and supply capacity, the parameter relationship between the coil and the generating magnet is: λ = L / D = 2 ± 1, δ = T / D = 0.6 ± 0.4, η = V / D = 2.25 ± 0.75, β = U / D = 1.3 ± 0.7, where D is the diameter of the spherical and cylindrical generating magnets, L is the length of the cylindrical generating magnet, T, V, and U are the wall thickness, radial width, and height of coil x, respectively. The radial width of coil x refers to the width of coil x along the radial direction of the generating magnet. δ, η, and β are respectively referred to as the coil wall thickness ratio, coil width ratio, and coil height ratio. δ, η, and β are collectively referred to as the coil parameter ratio. The present invention uses the output power ratio to evaluate the power generation and supply capacity. The output power ratio refers to the ratio of the power obtained for different structural parameters to its maximum value. The output power is the product of the open-circuit voltage and the short-circuit current.

[0017] In the present invention, during the opening and closing movement of the door body, the trigger stimulates the alarm to generate electricity in a non-contact manner and transmits the opening and closing information of the door body. The overall structure is simple and the trigger excitation reliability is high. The structure and principle of the power generation unit are completely different from the existing technology: the trigger magnet forces the power generation magnet inside the coil to flip, thereby changing the magnetic pole direction of the power generation magnet and the magnetic field strength passing through the coil. The coil cuts the magnetic lines to generate electricity. In the process of the power generation magnet rolling and flipping inside the coil, the magnetic field change gradient inside the coil caused by the change of the magnetic pole of the power generation magnet is large, so the power generation capacity is strong, the output voltage is high, and the amount of electricity is large.

[0018] Advantages and features: It has an automatic alarm function for opening and closing, and is self-sufficient in energy. The power generation unit has a simple structure, high triggering and excitation reliability, and strong power generation and supply capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of an anti-theft door in a preferred embodiment of the present invention;

[0020] Figure 2 When the door body is equipped with a trigger and the door frame is equipped with an alarm Figure 1 AA section view;

[0021] Figure 3 When the door body is equipped with an alarm and the door frame is equipped with a trigger Figure 1 AA section view;

[0022] Figure 4 This is a schematic diagram of the structure of an alarm in a preferred embodiment of the present invention;

[0023] Figure 5 yes Figure 4 BB cross-sectional view;

[0024] Figure 6 This is a structural diagram of an alarm housing in a preferred embodiment of the present invention;

[0025] Figure 7 This is a schematic structural diagram of an alarm cover in a preferred embodiment of the present invention;

[0026] Figure 8 This is a schematic structural diagram of a single magnet trigger in a preferred embodiment of the present invention;

[0027] Figure 9 This is a schematic structural diagram of a double-magnet trigger in a preferred embodiment of the present invention;

[0028] Figure 10 1 is a graph showing the relationship between the output power ratio and the coil wall thickness ratio and height ratio in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0029] The present invention provides a self-powered alarm anti-theft door composed of a door body M, a door frame K, a door lock S, a trigger Q and an alarm F. The trigger Q consists of a trigger shell z and a trigger magnet w installed thereon. The trigger magnet w is embedded in the inside of the trigger shell z or installed on the trigger shell z via screws. The alarm F consists of an alarm shell a, an alarm cover b, an electric control board p, a coil x and a generating magnet y. The electric control board p is provided with an energy collection and management unit and an information processing and transmitting unit.

[0030] The alarm shell a is composed of a shell bottom a1, a shell outer wall a2 and a shell inner wall a3. The shell inner wall a3 and the shell outer wall a2 are located on the same side of the shell bottom a1. The shell inner wall a3 is shorter than the shell outer wall a2 and is located inside the shell outer wall a2. The shell bottom a1, the shell outer wall a2 and the shell inner wall a3 form a linear cavity a4. The shell bottom a1 and the shell inner wall a3 form a magnetic cavity a5. The linear cavity a4 is a circular cavity, a square cavity or a rectangular cavity. The magnetic cavity a5 is a circular cavity, a square cavity or a rectangular cavity. The shapes of the linear cavity a4 and the magnetic cavity a5 refer to the shapes of their projections on the shell bottom a1; the alarm cover b is composed of a cover plate b1 and a cover wall b2. The cover plate b1 and the cover wall b2 form a cover cavity b3.

[0031] The alarm cover b is installed on the alarm shell a by screws and the coil x and the generating magnet y are respectively enclosed in the line cavity a4 and the magnetic cavity a5 through the partition c. The generating magnet y is located inside the coil x, and the electronic control board p is installed in the cover cavity b3 by screws; the cover plate b1 of the alarm cover b is installed on the end of the outer wall a2 of the alarm shell a by screws, and the cover wall b2 presses the partition c to the end of the inner wall a3 of the shell. The partition c encloses the coil x and the generating magnet y in the line cavity a4 and the magnetic cavity a5 respectively, and the coil x is fixedly installed in the line cavity a4, and the generating magnet y can roll freely in the magnetic cavity a5; the generating magnet y is a sphere, a cylinder or a cuboid, and the cylindrical generating magnet y is unipolar radially magnetized and has only a pair of radially arranged magnetic poles. , that is, there is only one N pole and one S pole; the axis f of the cylindrical power-generating magnet y is perpendicular to the axis e of the coil x, and the coil x is coaxial with the magnetic cavity a5, that is, the axis e of the coil x overlaps with the axis a6 of the magnetic cavity a5; the surface of the spherical and cylindrical power-generating magnet y is exposed or provided with a protective layer of polymer material, the rectangular power-generating magnet y is embedded in the cylinder made of polymer material and its magnetic poles are distributed along the radial direction of the cylinder in which it is located, the axis of the rectangular power-generating magnet y, that is, the axis of the cylinder in which the rectangular power-generating magnet y is located, is perpendicular to the axis e of the coil x, and the polymer material is polytetrafluoroethylene; the coil x and the power-generating magnet y inside it constitute a transducer, and the trigger magnet w and the transducer constitute a power-generating unit.

[0032] The door body M is installed on the door frame K via hinges, the trigger Q and the alarm F are installed on the door body M and the door frame K respectively, or the trigger Q and the alarm F are installed on the door frame K and the door body M respectively, the trigger Q and the alarm F are embedded in the door body M or the door frame K, the trigger Q and the alarm F are installed on two mutually close and opposite sides of the door body M and the door frame K, and the geometric center of the trigger magnet w and the geometric center of the generating magnet y are located on the same horizontal plane; the installed trigger Q and alarm F constitute a self-powered opening and closing trigger alarm system.

[0033] The trigger Q contains at least one trigger magnet w, and the trigger Q contains at least one pair of trigger magnetic poles. Two adjacent opposite magnetic poles located in the same horizontal plane in the trigger Q constitute a pair of trigger magnetic poles, that is, two adjacent N poles and S poles on the relative motion path of the trigger Q and the alarm F constitute a pair of trigger magnetic poles; the two magnetic poles in the pair of trigger magnetic poles are the N pole and S pole of the same trigger magnet w, or the two magnetic poles in a pair of trigger magnetic poles are respectively the N pole and S pole of two adjacent trigger magnets w, that is, the N pole of one trigger magnet w and the S pole of another trigger magnet w adjacent to it constitute a pair of trigger magnetic poles.

[0034] When the trigger Q contains only one trigger magnet w, the magnetic poles of the trigger magnet w are arranged along the front-to-back direction of the door, that is, along the thickness direction of the door body M when it is closed. The line connecting the magnetic poles of the trigger magnet w is located in the tangent direction of the motion trajectory of the outer edge of the door body M, that is, the magnetic poles of the trigger magnet w are arranged on the path of relative motion between the trigger Q and the excitation alarm F. During the opening and closing movement of the door body M, the alarm F moves from one magnetic pole of the trigger magnet w to the other, or the two magnetic poles of the trigger magnet w pass through the alarm F in sequence.

[0035] When the trigger Q contains multiple trigger magnets w, each trigger magnet w is arranged on the same horizontal plane along the front-to-back direction of the door and the magnetic poles of two adjacent trigger magnets w are arranged in opposite directions. The magnetic poles of each trigger magnet w are arranged along the left-right direction of the door, or the normal direction of the movement trajectory of the outer edge of the door body M, that is, the line connecting the magnetic poles of each trigger magnet w is along the left-right direction of the door, or the normal direction of the movement trajectory of the outer edge of the door body M. The left-right direction of the door refers to the width direction of the door body M in the closed state; during the opening and closing movement of the door body M, the alarm F passes by one magnetic pole of each trigger magnet w in turn, or one magnetic pole of each trigger magnet w passes by the alarm F in turn.

[0036] During operation, that is, during the opening and closing process of the anti-theft door, the distance between the trigger Q and the alarm F increases from near to far or from far to near, and the trigger Q forces the magnetic pole of the generating magnet y in the alarm F to flip, that is, the two adjacent opposite magnetic poles of the trigger magnet w in the trigger Q force the magnetic pole of the generating magnet y in the alarm F to flip, that is, the direction of the magnetic lines of force of the generating magnet y in the coil x is flipped, and the coil x cuts the magnetic lines of force to generate electricity. After conversion and processing, the electrical energy is supplied to the information processing and transmitting unit, and the transmitting unit transmits the opening or closing action information of the door body M to the receiving terminal, which is an Internet of Things terminal, a mobile phone or an indoor doorbell receiving terminal.

[0037] Taking the movement process of the door M from closing to opening as an example, the working principle and process of the trigger Q and the alarm F are as follows.

[0038] In the door closing state, that is, the door body M and the door frame K are in the closed state, the trigger Q and the alarm F are facing each other and the distance between them is the shortest, the generating magnet y is closest to one magnetic pole of a single trigger magnet w or closest to one magnetic pole of a trigger magnet w among the multiple trigger magnets w, and a mutual attraction is generated between the generating magnet y and the opposite magnetic poles of the trigger magnet w it is close to; in the initial state: the N pole of the generating magnet y is close to the S pole of the trigger magnet w it is close to and attracts each other, then the N pole of the generating magnet y points to the trigger Q.

[0039] During the door opening process, that is, when the door body M moves away from the door frame K, the S pole of the triggering magnet w gradually moves away from the generating magnet y, and the N pole of the triggering magnet w gradually approaches the generating magnet y. The force exerted by the S pole of the triggering magnet w on the generating magnet y gradually decreases, and the force exerted by the N pole gradually increases. When the distance between the generating magnet y and the N pole of the triggering magnet w is smaller than the distance between the S poles, the magnetic pole of the generating magnet y flips, and the S pole of the generating magnet y and the N pole of the triggering magnet w it is close to attract each other, and the S pole of the generating magnet y points to the trigger Q.

[0040] In the present invention, the trigger Q includes at least one group of trigger magnets w, each group includes at least one trigger magnet w, and the alarm F includes at least one transducer composed of a power generation magnet y and a coil x. The number of groups of trigger magnets w is equal to the number of transducers.

[0041] In the present invention, except for the trigger magnet w and the generating magnet y, other components in the trigger Q and the alarm F are made of non-ferromagnetic materials, and the non-ferromagnetic materials include metals such as stainless steel, aluminum alloy and copper, and polymer plastics; there is no coupling effect between the generating magnet y and the door body M and the door frame K, and there is no magnetic coupling force between the generating magnet y and the door body M and the door frame K.

[0042] In the present invention, to achieve optimal power generation and supply capacity, the parameter relationship between the coil x and the generating magnet y is: λ = L / D = 2±1, δ = T / D = 0.6±0.4, η = V / D = 2.25±0.75, β = U / D = 1.3±0.7, where D is the diameter of the spherical and cylindrical generating magnets y, L is the length of the cylindrical generating magnet y, T, V, and U are the wall thickness, radial width, and height of the coil x, respectively. The radial width of the coil x refers to the width of the coil x along the radial direction of the generating magnet y. δ, η, and β are respectively referred to as the coil wall thickness ratio, coil width ratio, and coil height ratio. δ, η, and β are collectively referred to as the coil parameter ratio. The present invention uses the output power ratio to evaluate the power generation and supply capacity. The output power ratio refers to the ratio of the power obtained for different structural parameters to its maximum value. The output power is the product of the open-circuit voltage and the short-circuit current.

[0043] In the present invention, during the opening and closing movement of the door body M, the trigger Q stimulates the alarm F to generate electricity in a non-contact manner and transmits the opening and closing information of the door body M. The overall structure is simple and the trigger excitation reliability is high. The structure and principle of the power generation unit are completely different from the existing technology: the trigger magnet w forces the power generation magnet y inside the coil x to flip, thereby changing the magnetic pole direction of the power generation magnet y and the magnetic field strength passing through the coil x. The coil x cuts the magnetic lines to generate electricity. During the rolling and flipping process of the power generation magnet y inside the coil x, the magnetic field change gradient inside the coil x caused by the change of the magnetic pole of the power generation magnet y is large, so the power generation capacity is strong, the output voltage is high, and the amount of electricity is large.

Claims

1. A self-powered alarm security door, consisting of a door body, a door frame, a trigger and an alarm, characterized by: The trigger is composed of a trigger shell and an installed trigger magnet, and the alarm is composed of an alarm shell, an alarm cover, an electric control panel, a coil and a power-generating magnet; the trigger contains at least one group of trigger magnets, each group contains at least one trigger magnet, and the alarm contains at least one transducer consisting of a power-generating magnet and a coil, and the number of groups of trigger magnets is equal to the number of transducers; the door body is mounted on the door frame via hinges, and the trigger and the alarm are respectively mounted on the door body and the door frame, or the trigger and the alarm are respectively mounted on the door frame and the door body; the shell bottom, shell outer wall and shell inner wall of the alarm shell form a linear cavity, and the shell bottom and shell inner wall form a magnetic cavity; the alarm cover The cover plate and the cover wall form a cover cavity; the trigger contains at least one pair of trigger poles, the two poles of the pair of trigger poles are respectively the opposite poles of two adjacent trigger magnets, each trigger magnet is arranged on the same horizontal plane along the front-back direction of the door, and the poles of each trigger magnet are arranged along the left-right direction of the door or the normal direction of the movement trajectory of the outer edge of the door; the alarm cover is installed on the alarm shell and the coil and the power generation magnet are respectively encapsulated in the line cavity and the magnetic cavity through the partition, the power generation magnet is located in the coil and can roll freely, the electric control board is installed in the cover cavity, the geometric center of the trigger magnet and the geometric center of the power generation magnet are located on the same horizontal plane; the power generation magnet is spherical The cylindrical power-generating magnet is radially magnetized; the rectangular power-generating magnet is embedded in the cylinder made of polymer material and its magnetic poles are distributed along the radial direction of the cylinder. The axis of the cylindrical and rectangular power-generating magnets is perpendicular to the axis of the coil. The ratio of the length L to the diameter D of the cylindrical power-generating magnet is λ = L / D = 2 ± 1; the parameter relationship between the coil and the power-generating magnet is: δ = T / D = 0.6 ± 0.4, η = V / D = 2.25 ± 0.75, β = U / D = 1.3 ± 0.7, where D is the diameter of the spherical and cylindrical power-generating magnets, and L is the diameter of the cylindrical power-generating magnet. Length, T, V and U are the wall thickness, radial width and height of coil x respectively. The radial width of coil x refers to the width of coil x along the radial direction of the generating magnet. δ, η and β are called the coil wall thickness ratio, coil width ratio and coil height ratio respectively. During operation, the distance between the trigger and the alarm increases from near to far or from far to near. The alarm passes through one pole of each trigger magnet in turn, or one pole of each trigger magnet passes through the alarm in turn. The trigger forces the pole of the generating magnet to flip, and the coil cuts the magnetic lines to generate electricity. After conversion, the electrical energy is supplied to the information processing and transmitting unit, and the transmitting unit transmits the action information of the door body to the receiving end.

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