A door magnetic alarm with protective function

Abstract

This utility model belongs to the technical field of door magnetic alarm devices, specifically relating to a door magnetic alarm device with protective functions. It includes a mounting box and a corresponding magnet assembly. The mounting box contains an elastic mechanical triggering mechanism that cooperates with the magnet assembly. A cover is installed on the mounting box to shield the elastic mechanical triggering mechanism. This utility model, through the cooperation of the elastic mechanical triggering mechanism, reed switch, and magnet assembly, achieves dual protection functions of magnetic field change triggering and mechanical triggering. This effectively prevents the alarm from being deceived by a strong magnet, causing it to mistakenly determine that the door is closed, significantly improving the protective effect of fire monitoring. Simultaneously, this design ensures reliable alarm triggering when the door is actually opened, facilitating timely warning signals in emergency situations, thereby improving the overall fire safety protection level of the premises.

Description

Technical Field

[0001] This utility model belongs to the technical field of door magnetic alarm devices, specifically relating to a door magnetic alarm device with protective functions. Background Technology

[0002] Existing magnetic door alarms, as a fundamental component of security systems, generally rely on reed switches or Hall effect sensors to detect changes in magnetic fields. When the magnetic component installed on the door opens and moves away from the alarm body mounted on the door frame, the magnetic field weakens or disappears, triggering the internal circuitry. However, this single-minded reliance on magnetic field states presents significant security risks. In practical applications, especially for doors requiring frequent entry and exit but also requiring constant monitoring (such as fire escape doors, warehouse back doors, and equipment room doors), users often use additional strong magnets (magnets) to directly attach to the closed magnetic door alarm body, artificially creating a [safety hazard]. A "constant strong magnetic field" environment is used to deceive the alarm, causing it to remain in a false "door closed" state. This malicious circumvention behavior renders the door magnetic alarm completely ineffective, losing its ability to monitor and alarm for illegal or accidental door opening. The consequences are severe, not only disrupting the real-time and effective monitoring of the fire protection system (e.g., failing to alarm when fire doors are illegally opened or not properly closed), rendering security monitoring ineffective, but also failing to issue timely warning signals in the event of sudden emergencies such as fires or thefts, missing critical emergency response opportunities, and greatly reducing the overall security of the premises. Therefore, this utility model proposes a door magnetic alarm with protective functions to solve the above-mentioned technical problems. Utility Model Content

[0003] The purpose of this invention is to provide a door magnetic alarm with protective functions, which can solve the above-mentioned technical problems.

[0004] The specific technical solution adopted by this utility model is as follows:

[0005] This utility model provides a door magnetic alarm with protective function, including a mounting box and a magnet assembly corresponding to the mounting box. The mounting box is provided with an elastic mechanical triggering mechanism that cooperates with the magnet assembly. The mounting box is equipped with a cover for covering the elastic mechanical triggering mechanism.

[0006] The elastic mechanical triggering mechanism includes a support frame and a sliding column. The support frame is arched and installed inside the mounting box and located above the circuit board. The support frame is installed between the inner wall of the mounting box and the battery mounting frame, and the battery mounting frame is fixedly installed inside the mounting box, while the circuit board is fixedly installed on the bottom surface inside the mounting box.

[0007] The sliding post is slidably sleeved inside the perforated block, and the perforated block is fixedly set on the inner top surface of the support frame. The sliding post passes through a rectangular hole opened in one of the side plates of the support frame. A trigger plate is installed on one end face of the sliding post that extends into the support frame, and the trigger plate is set in correspondence with the trigger. The trigger is fixedly installed on the inner side of the support frame.

[0008] Preferably, tension springs are symmetrically arranged on the outer periphery of the sliding column, one side of the tension spring is sleeved on the hanging ring, and the hanging ring is fixedly arranged at the free end of the extension column, and the extension column is vertically fixedly arranged on the side of the perforated block.

[0009] Preferably, the other side of the tension spring is sleeved on the screw and nut assembly, which is fixed through the sliding post. The sliding post is sleeved with an opening on the side plate of the mounting box and is located between the circuit board and the top surface of the support frame.

[0010] Preferably, a guide plate is provided between the circuit board and the sliding column. The guide plate is in an inclined state and is correspondingly arranged with the magnet assembly. The guide plate is fixedly arranged on the end of the sliding column located on the outside of the mounting box.

[0011] Preferably, the support frame is provided with a plurality of fasteners, and the support frame is fixed between the inside of the mounting box and the battery mounting frame by means of the fasteners.

[0012] Preferably, the mounting box is provided with a reed switch electrically connected to the circuit board, and the reed switch is correspondingly arranged with the magnet assembly. The mounting box is also provided with a loudspeaker mounting frame for mounting the loudspeaker, and the loudspeaker mounting frame is circular.

[0013] The beneficial effects are:

[0014] This invention achieves dual protection functions of magnetic field change triggering and mechanical triggering through the cooperation of an elastic mechanical triggering mechanism, a reed switch, and a magnet assembly. This effectively prevents the alarm from being misled by a strong magnet into misjudging that the door is closed, significantly improving the protection effect of fire monitoring. At the same time, this design ensures that the alarm can be reliably triggered when the door is actually opened, facilitating timely warning signals in case of emergencies, thereby improving the overall fire safety protection level of the premises. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the explosion distribution structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the explosion distribution structure of the elastic mechanical triggering mechanism of this utility model.

[0018] The attached diagram lists the components represented by each number as follows:

[0019] 1. Mounting box; 1a. Opening; 11. Battery mounting frame; 12. Megaphone mounting frame; 13. Reed switch; 14. Circuit board; 2. Elastic mechanical trigger mechanism; 21. Support frame; 22. Perforated block; 22a. Extension post; 22b. Hanging ring; 23. Tension spring; 24. Sliding post; 24a. Guide plate; 24b. Trigger plate; 25. Screw and nut assembly; 26. Trigger; 3. Cover; 4. Magnet assembly; 5. Fastener. Detailed Implementation

[0020] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0021] like Figure 1-3 As shown, a door magnetic alarm with protective function includes a mounting box 1 and a magnet assembly 4 corresponding to the mounting box 1. The mounting box 1 is provided with an elastic mechanical triggering mechanism 2 that cooperates with the magnet assembly 4. A cover 3 for covering the elastic mechanical triggering mechanism 2 is installed on the mounting box 1.

[0022] The elastic mechanical triggering mechanism 2 includes a support frame 21 and a sliding column 24. The support frame 21 is arched and installed inside the mounting box 1 and is located above the circuit board 14. The support frame 21 is installed between the inner wall of the mounting box 1 and the battery mounting frame 11, and the battery mounting frame 11 is fixedly installed inside the mounting box 1, while the circuit board 14 is fixedly installed on the bottom surface inside the mounting box 1.

[0023] The sliding post 24 is slidably sleeved inside the perforated block 22, and the perforated block 22 is fixedly set on the inner top surface of the support frame 21. The sliding post 24 passes through a rectangular hole opened in one of the side plates of the support frame 21. A trigger piece 24b is installed on one end face of the sliding post 24 that extends into the support frame 21, and the trigger piece 24b is correspondingly set with the trigger 26, while the trigger 26 is fixedly installed on the inner side of the support frame 21.

[0024] As an optional implementation, tension springs 23 are symmetrically arranged on the outer periphery of the sliding column 24. One side of the tension spring 23 is sleeved on the hanging ring 22b, and the hanging ring 22b is fixedly arranged at the free end of the extension column 22a. The extension column 22a is vertically fixedly arranged on the side of the perforated block 22. In this way, one side of the tension spring 23 can be attached and fixed, while ensuring that the two tension springs 23 form symmetrical elastic tension on the sliding column 24.

[0025] See attached document Figure 3The other side of the tension spring 23 is sleeved on the screw and nut assembly 25. The screw and nut assembly 25 is fixed through the sliding post 24. The sliding post 24 is sleeved with the opening 1a on the side plate of the mounting box 1 and is located between the circuit board 14 and the inner top surface of the support frame 21. In this way, the screw and nut assembly 25 on the sliding post 24 can be in an elastic outward convex state by relying on the tension spring 23, so that the sliding post 24 has an elastic sliding and retracting effect to respond to the corresponding triggering operation of the trigger piece 24b and the trigger 26.

[0026] See attached document Figure 2 A guide plate 24a is provided between the circuit board 14 and the sliding column 24. The guide plate 24a is in an inclined state and is correspondingly provided with the magnet assembly 4. The guide plate 24a is fixedly provided on the end of the sliding column 24 located on the outside of the mounting box 1. In this way, when the mounting box 1 is rotated by the door frame and approaches the magnet assembly 4, the inclined state of the guide plate 24a is used to guide it, thereby ensuring the pushing displacement effect of the magnet assembly 4 on the sliding column 24.

[0027] Furthermore, the support frame 21 is provided with a plurality of fasteners 5. The support frame 21 is fixed between the inner side of the mounting box 1 and the battery mounting frame 11 by means of the fasteners 5, so that after the support frame 21 is fitted into the mounting box 1, it is restricted from detaching by the fasteners 5, while ensuring the sliding stability of the sliding column 24. The fasteners 5 are bolt and nut assemblies.

[0028] Furthermore, the mounting box 1 is provided with a reed switch 13 electrically connected to the circuit board 14, and the reed switch 13 is correspondingly arranged with the magnet assembly 4. The mounting box 1 is provided with a loudspeaker mounting frame 12 for mounting the loudspeaker, and the loudspeaker mounting frame 12 is circular, so as to facilitate the installation of the loudspeaker. After the reed switch 13 and the magnet assembly 4 are far apart, the circuit board 14 is triggered to control the loudspeaker to make a buzzer prompt.

[0029] Furthermore, the trigger 26 is a mechanical push-button trigger, which is an existing product. The trigger 26 is electrically connected to the circuit board 14 via a wire, or both the trigger piece 24b and the trigger 26 are made of metal and are electrically connected by a wire, which is electrically connected to the circuit board 14. The circuit board 14 is equipped with a linkage trigger module, which includes a current signal receiving unit, a signal processing unit, and an execution unit. When the signal processing unit receives a normal current signal, it keeps the execution unit in a non-operating state. When there is no current signal, it triggers the execution unit to control the loudspeaker to emit sound. The linkage trigger module and the trigger module composed of the reed switch 13 and the magnet assembly 4 operate independently.

[0030] Using the above structure, when the door is closed, the magnet assembly 4 tightly adheres to the guide plate 24a on the outside of the mounting box 1, overcoming the tension of the tension spring 23 and pushing the sliding column 24 inward towards the mounting box 1. At this time, the trigger plate 24b at the inner end of the sliding column 24 remains in contact with the trigger 26 on the inner side of the support frame 21, and the current signal receiving unit of the linkage trigger module detects a continuous current signal. The signal processing unit determines that it is in a normal closed state, and the execution unit does not operate. At the same time, the magnetic field generated by the magnet assembly 4 keeps the reed switch 13 in an attracted state, and the reed switch 13 trigger module is also in a non-alarm state. When the door is opened normally, the magnet assembly 4 moves away from the guide plate 24a with the door, and the sliding column 24 slides outward and resets under the elastic tension of the symmetrical tension spring 23, causing the trigger plate 24b to separate from the trigger 26, resulting in the interruption of the current signal. When the signal processing unit of the linkage trigger module detects no current signal, it immediately triggers the execution unit. The loudspeaker emits an alarm sound; simultaneously, the magnet assembly 4 moves away, causing the magnetic field of the reed switch 13 to disappear, and the reed switch 13 disconnects, triggering its independent alarm module. The circuit board 14 synchronously controls the loudspeaker to alarm, forming a double alarm confirmation. When a strong magnet is maliciously used to attach to the outer shell of the mounting box 1 in an attempt to deceive the system, although the strong magnet keeps the reed switch 13 in the attracted state (the reed switch 13 module does not alarm), the door actually opens, causing the magnet assembly 4 to move away from the guide plate 24a. The sliding column 24 will still move outward under the action of the tension spring 23, causing the trigger plate 24b to separate from the trigger 26. The linkage trigger module continues to trigger the loudspeaker alarm due to the current interruption. This mechanical triggering mechanism is independent of magnetic field induction and effectively detects the strong magnet deception method. Regardless of the triggering method used to activate the alarm, the door must be closed again to make the magnet assembly 4 press against the guide plate 24a and push the sliding column 24 inward, restoring the contact and conduction state between the trigger plate 24b and the trigger 26, in order to deactivate the alarm.

[0031] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part all adopt conventional methods such as bolts, rivets, and welding, which are mature technologies in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art, and is common knowledge in the field. Furthermore, this application is mainly used to protect mechanical devices, so the control method and circuit connection will not be explained in detail here. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, are implemented according to conventional methods in the field.

Claims

1. A door magnetic alarm with a protection function, characterized in that: It includes a mounting box (1) and a magnet assembly (4) corresponding to the mounting box (1). The mounting box (1) is provided with an elastic mechanical triggering mechanism (2) that cooperates with the magnet assembly (4). The mounting box (1) is provided with a cover (3) for covering the elastic mechanical triggering mechanism (2). The elastic mechanical triggering mechanism (2) includes a support frame (21) and a sliding column (24). The support frame (21) is arched and installed inside the mounting box (1) and located above the circuit board (14). The support frame (21) is installed between the inner wall of the mounting box (1) and the battery mounting frame (11). The battery mounting frame (11) is fixedly installed inside the mounting box (1), while the circuit board (14) is fixedly installed on the bottom surface inside the mounting box (1). The sliding column (24) is slidably sleeved in the perforated block (22), and the perforated block (22) is fixedly set on the inner top surface of the support frame (21). The sliding column (24) passes through a rectangular hole opened on one of the side plates of the support frame (21). A trigger piece (24b) is installed on one end face of the sliding column (24) that extends into the support frame (21), and the trigger piece (24b) is correspondingly set with the trigger (26), while the trigger (26) is fixedly installed on the inner side of the support frame (21).

2. The door magnetic alarm with protection function according to claim 1, characterized in that: A tension spring (23) is symmetrically arranged on the outer periphery of the sliding column (24). One side of the tension spring (23) is sleeved on the hanging ring (22b), and the hanging ring (22b) is fixedly arranged at the free end of the extension column (22a). The extension column (22a) is vertically fixedly arranged on the side of the perforated block (22).

3. The door magnetic alarm with protection function according to claim 2, characterized in that: The other side of the tension spring (23) is sleeved on the screw and nut assembly (25), which is fixed through the sliding column (24). The sliding column (24) is sleeved with the opening (1a) on the side plate of the mounting box (1) and is located between the circuit board (14) and the inner top surface of the support frame (21).

4. The door magnetic alarm with protection function according to claim 3, characterized in that: A guide plate (24a) is provided between the circuit board (14) and the sliding post (24). The guide plate (24a) is in an inclined state and is provided in correspondence with the magnet assembly (4). The guide plate (24a) is fixedly provided on the sliding post (24) at the end located outside the mounting box (1).

5. The door magnetic alarm with protection function according to claim 4, characterized in that: The support frame (21) is provided with a plurality of fasteners (5), and the support frame (21) is fixed between the inner side of the mounting box (1) and the battery mounting frame (11) by means of the fasteners (5).

6. The door magnetic alarm with protection function according to claim 5, characterized in that: The mounting box (1) is provided with a reed switch (13) electrically connected to the circuit board (14), and the reed switch (13) is correspondingly provided with the magnet assembly (4). The mounting box (1) is provided with a loudspeaker mounting frame (12) for mounting the loudspeaker, and the loudspeaker mounting frame (12) is circular.

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