Alarm equipment

Abstract

The present invention provides an alarm device, comprising: a front shell, a bottom shell and a trigger mechanism, wherein the front shell and the bottom shell are detachably or pivotally connected and jointly define a cavity, and a circuit board is also provided on the bottom shell. The trigger mechanism comprises an operating handle, a trigger button and a handle reset structure, and the operating handle can be driven to rotate relative to the front shell. The trigger button is provided between the front shell and the bottom shell and is connected to the circuit board; the operating handle abuts against the trigger button, and the abutting position of the operating handle and the trigger button is located in the cavity defined by the front shell and the bottom shell; when the operating handle rotates relative to the front shell, the trigger button switches between open and closed. The handle reset structure is connected to the front shell and the operating handle, and is configured to provide an elastic force to resist the rotation of the operating handle relative to the front shell. The embodiments of the present invention can be quickly triggered and automatically reset, with low processing and maintenance costs, and the operations of triggering the alarm and resetting are simple and easy to use.

Description

Technical Field

[0001] The present invention generally relates to the technical field of fire-fighting devices, and in particular to an alarm device. Background Art

[0002] Automatic or manually triggered alarm devices are commonly used in fire protection systems. In addition to disposable alarm devices, multiple-use alarm devices usually need to meet the structural conditions of triggering, maintaining triggering and resetting. The existing alarm devices have complex structures, high processing and maintenance costs, and the reset process requires cumbersome operations, which is inconvenient to use. Therefore, there is a need to improve the existing alarm device structure.

[0003] The contents of the background technology section are merely the technologies known to the inventors and do not necessarily represent the existing technologies in this field. Summary of the Invention

[0004] In view of one or more deficiencies in the prior art, the present invention provides an alarm device, comprising:

[0005] front shell;

[0006] A bottom shell, the front shell and the bottom shell are detachably or pivotally connected to each other and define a cavity together, and the bottom shell is further provided with a circuit board; and

[0007] A trigger mechanism, comprising:

[0008] an operating handle configured to be driven to rotate relative to the front housing;

[0009] a trigger button, the trigger button being disposed between the front housing and the bottom housing and connected to the circuit board; the operating handle abutting the trigger button, and the abutting position of the operating handle and the trigger button being located within the cavity defined by the front housing and the bottom housing; when the operating handle rotates relative to the front housing, the trigger button switches between open and closed, and when the trigger button is in the closed state, an alarm signal is issued via the circuit board; and

[0010] A handle reset structure is connected to the front housing and the operating handle and is configured to provide an elastic force to resist the operating handle from rotating relative to the front housing.

[0011] According to one aspect of the present invention, the operating handle comprises:

[0012] a contact portion, the contact portion being a raised structure and abutting against the trigger button; and

[0013] A rotating shaft, the operating handle can rotate around the rotating shaft, and the handle reset structure is a torsion spring, which is sleeved on the rotating shaft.

[0014] According to one aspect of the present invention, the operating handle further comprises:

[0015] The handle slot rotates synchronously with the operating handle around the rotation axis, and when the trigger button is in a closed state, the trigger button is engaged with the handle slot.

[0016] According to one aspect of the present invention, the front shell is provided with a handle pressing plate, and the handle pressing plate confines the contact portion within a cavity defined by the front shell and the bottom shell.

[0017] According to one aspect of the present invention, the alarm device further comprises a locking mechanism, which is disposed between the front shell and the bottom shell and is configured to be able to controllably lock and unlock the front shell and the bottom shell.

[0018] According to one aspect of the present invention, the front shell and / or the bottom shell are provided with a buckle and a lock hole, the locking mechanism includes a mating structure corresponding to the buckle, and the locking mechanism is configured to be driven to rotate at the position of the lock hole so that the mating structure and the buckle can switch between locking and unlocking.

[0019] According to one aspect of the present invention, the front shell and / or the bottom shell are provided with a limiting column, a return spring is provided in the limiting column, the return spring is connected to the matching structure, and is configured to provide an elastic force that hinders the rotation of the locking mechanism.

[0020] According to one aspect of the present invention, the front shell and / or the bottom shell are provided with supporting ribs, and the locking mechanism further includes a latch, the position of the supporting ribs corresponds to the position of the latch, and after the locking mechanism rotates a certain angle, the latch abuts against the supporting ribs to limit the rotation of the locking mechanism.

[0021] According to one aspect of the present invention, the alarm device further includes a rear shell, which is buckled onto a side of the bottom shell away from the front shell, and the circuit board is arranged between the bottom shell and the rear shell; the rear shell is entirely embedded in the installation surface of the alarm device.

[0022] According to one aspect of the present invention, the alarm device further includes a light guide column, and the light guide column is installed on the front shell and the bottom shell.

[0023] Compared with the prior art, an embodiment of the present invention provides an alarm device, in which the trigger mechanism sends an alarm signal by operating the handle to close the trigger button, and the alarm device is reset through the handle reset structure. The alarm device in this embodiment has a simple structure, can remain stable for a long time, can be triggered quickly, and automatically reset, with low processing and maintenance costs, and the operations of triggering the alarm and resetting are simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 is a schematic diagram of an explosion of an alarm device in one embodiment of the present invention;

[0026] Figure 2 is a cross-sectional view of an alarm device according to one embodiment of the present invention;

[0027] Figure 3 1 is a schematic diagram of the cooperation between the front shell and the bottom shell in one embodiment of the present invention;

[0028] Figure 4 This is a schematic structural diagram of an operating handle in one embodiment of the present invention;

[0029] Figure 5 2 is a schematic structural diagram of a handle pressure plate in one embodiment of the present invention;

[0030] Figure 6 1 is a schematic diagram of the installation of a torsion spring in one embodiment of the present invention;

[0031] Figure 7 is a schematic structural diagram of a locking mechanism in one embodiment of the present invention;

[0032] Figure 8 Schematic diagram of the structure of the bottom shell buckle in one embodiment of the present invention. DETAILED DESCRIPTION

[0033] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0034] In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for the purpose of facilitating the description of the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the aforementioned features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, removable, or integral connections; mechanical, electrical, or intercommunication connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact via another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is at a lower level than the second feature.

[0037] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0038] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0039] Figure 1 and Figure 2 The specific structure of the alarm device 100 according to the embodiment of the present invention is shown below. Figure 1 and Figure 2 Expand description.

[0040] like Figure 1 and Figure 2 As shown, in this embodiment, the alarm device 100 includes a front shell 110, a bottom shell 120 and a trigger mechanism, wherein the front shell 110 and the bottom shell 120 are detachably or pivotally connected. For example, the bottom shell 120 is configured to be approximately flat, and the front shell 110 is buckled onto the bottom shell 120, forming a cavity between the front shell 110 and the bottom shell 120. According to a preferred embodiment of the present invention, the front shell 110 and the bottom shell 120 can be configured to be hinged at one end by a connecting pin, such as Figure 3 As shown, the front shell 110 and the bottom shell 120 can rotate relative to each other, so that the front shell 110 is opened relative to the bottom shell 120 to expose the internal cavity.

[0041] The front shell 110 can be processed into a specific shape according to the specific design. The cavity formed between the front shell 110 and the bottom shell 120 can accommodate batteries, sound and light alarm devices, etc. The bottom shell 120 is also provided with a circuit board 121. Specifically, the circuit board 121 can be arranged on the side of the bottom shell 120 facing the front shell 110, that is, arranged in the cavity in the shape of the front shell 110 and the bottom shell 120, or it can be arranged on the side of the bottom shell 120 away from the front shell 110. The circuit board 121 and the bottom shell 120 can be fixedly connected by bolts or bonding. Furthermore, the circuit board 121 can be set with an alarm program, or connected to a specific sound and light alarm device, or other alarm system, and the alarm signal is sent through a trigger mechanism.

[0042] In this embodiment, the trigger mechanism includes an operating handle 131, a trigger button 132 and a handle reset structure 133, wherein the operating handle 131 can be set to a manually operable shape, such as a pull ring. The alarm device 100 is triggered manually or connected to other sensing devices for triggering. For example, a sensing device that is affected by information such as temperature and electrical signals can cause the operating handle 131 to deform, so as to trigger the operating handle 131 under preset circumstances.

[0043] The operating handle 131 is configured to be driven to rotate relative to the front shell 110. Specifically, a through hole can be provided on the front shell 110. Part of the structure of the operating handle 131 extends from the position of the through hole of the front shell 110 to the outside of the front shell 110 and can be affected by external force to make the operating handle 131 rotate relative to the front shell 110.

[0044] The trigger button 132 is disposed between the front shell 110 and the bottom shell 120 and is connected to the circuit board 121. That is, the trigger button 132 is disposed inside the cavity defined by the front shell 110 and the bottom shell 120. At the same time, the operating handle 131 abuts against the trigger button 132. By rotating the operating handle 131 relative to the front shell 110, the trigger button 132 is controlled to be opened and closed. Figure 2 As shown, the abutment between the operating handle 131 and the trigger button 132 is located within the cavity defined by the front housing 110 and the bottom housing 120, reducing the impact of the external environment on the trigger button 132 and preventing accidental triggering. Specifically, the trigger button 132 can be configured to be abutted by the operating handle 131 and remain open for a long period of time. When the pressure between the operating handle 131 and the trigger button 132 decreases, the trigger button 132 enters a closed state due to the structure of the trigger button 132. For example, the trigger button 132 is a release-type switch. When the trigger button 132 is in the closed state, an alarm signal is transmitted through the circuit board 121.

[0045] According to a specific embodiment of the present invention, Figure 1 As shown, the circuit board 121 is arranged on the side of the bottom shell 120 away from the front shell 110, and a through hole is opened on the bottom shell 120 for the trigger button 132 or the connecting line to extend out of the cavity defined by the bottom shell 120 and the front shell 110, and be connected to the circuit board 121. When the trigger button 132 is in the open state, the preset alarm circuit in the circuit board 121 is disconnected. When the trigger button 132 is in the closed state, the preset alarm circuit in the circuit board 121 is connected, and an alarm signal can be sent out, such as triggering an audible and visual alarm device, or transmitting the alarm signal to a system that receives the alarm signal.

[0046] Specifically, the operating handle 131 can be structurally configured to ensure that when the operating handle 131 rotates relative to the front housing 110, the trigger button 132 can be opened and closed. The specific structural design will be described in detail in subsequent embodiments in conjunction with corresponding drawings.

[0047] The handle reset structure 133 is connected to the front shell 110 and the operating handle 131, and the handle reset structure 133 can provide elastic force to resist the rotation of the operating handle 131 relative to the front shell 110. For example, an elastic structure is set. When the operating handle 131 rotates relative to the front shell 110 under the action of external force, the handle reset structure 133 obtains elastic potential energy, which prevents the operating handle 131 from rotating relative to the front shell 110. When the alarm device 100 is manually triggered, the handle reset structure 133 can provide operational feedback to the user. When the alarm is automatically triggered through other structures, the handle reset structure 133 can drive the operating handle 131 to return to its initial position when the external force is removed. For example, after the alarm is removed, the trigger mechanism can be reset through the handle reset structure 133, so that the alarm device 100 can be reused.

[0048] According to a preferred embodiment of the present invention, Figure 4 As shown, the operating handle 131 includes a contact portion 131-1 and a rotating shaft 131-2, wherein the contact portion 131-1 is a raised structure and abuts against the trigger button 132. For example, the contact portion 131-1 has a raised edge. As the operating handle 131 rotates relative to the front shell 110, the raised portion of the contact portion 131-1 moves toward or away from the contact button 132.

[0049] The rotation axis 131-2 is provided between the front housing 110 and the operating handle 131. The operating handle 131 can rotate around the rotation axis 131-2. The handle reset structure 133 is a torsion spring. Figure 6 As shown, the torsion spring is sleeved on the rotating shaft 131-2, with its two ends respectively contacting the operating handle 131 and the front shell 110. As the operating handle 131 rotates relative to the front shell 110 around the rotating shaft 131-2, the torsion spring gains or releases elastic potential energy. According to a preferred embodiment of the present invention, the rotating shaft 131-2 can be set to pass through one end of the operating handle 131, and both ends of the rotating shaft 131-2 extend outward, as shown in FIG. Figure 4 As shown, torsion springs may be provided at both ends of the extended rotation shaft 131 - 2 to improve the force stability of the operating handle 131 .

[0050] like Figure 4As shown, according to a preferred embodiment of the present invention, the operating handle 131 further includes a handle slot 131-3. The handle slot 131-3 can be configured as a fixed structure integrally formed with the contact portion 131-1, so that the operating handle 131 rotates synchronously around the rotation axis 131-2, and the handle slot 131-3 is configured so that when the trigger button 132 rotates with the operating handle 131 and is in a closed state, the trigger button 132 is engaged with the handle slot 131-3, so that the relative positions of the trigger button 132 and the operating handle 131 remain fixed, and the operating handle 131 cannot be restored to its initial position under the action of the handle reset structure 133. Specifically, as shown in FIG. Figure 4 As shown, the handle slot 131-3 can be configured as a groove that can engage with the trigger button 132. In a preferred embodiment of the present invention, the operating handle 131 rotates about the rotation axis 131-2, and the trigger button 132 switches from an open state to a closed state. The operating handle 131 is further driven to rotate about the rotation axis 131-2, and the handle slot 131-3 rotates approximately perpendicular to the trigger button 132. The trigger button 132 engages with the handle slot 131-3, and the trigger button 132 can remain in the closed state. The alarm circuit in the circuit board 121 remains connected, and the alarm signal is continuously sent out.

[0051] The operating handle 131 structure in this embodiment can maintain the trigger button 132 in a closed state when the alarm is triggered. Even after the external force is removed, the operating handle 131 will not return to its initial position under the action of the handle reset structure 133 until the alarm is lifted.

[0052] According to a preferred embodiment of the present invention, the front shell 110 is further provided with a handle pressing plate 111. Figure 5 As shown, the handle pressure plate 111 is arranged between the front shell 110 and the bottom shell 120, for example, fixedly connected by bolts, and the handle pressure plate 111 can be used to confine the operating handle 131 in the cavity between the front shell 110 and the bottom shell 120 to prevent the operating handle 131 from detaching from the front shell 110. Furthermore, the handle pressure plate 111 can also be arranged to limit the rotation angle of the operating handle 131 relative to the front shell 110. For the case of manually triggering the alarm device 100, the manual pulling force is difficult to quantify and standardize. In order to prevent the operating handle 131 from excessively rotating relative to the front shell 110, this embodiment can limit the rotation angle of the operating handle 131 by setting the handle pressure plate 111, thereby protecting the structure of the front shell 110 and the operating handle 131.

[0053] In a preferred embodiment of the present invention, the alarm device 100 further comprises a locking mechanism, wherein the locking mechanism is disposed between the front shell 110 and the bottom shell 120 and is configured to be controlled to lock or unlock the front shell 110 and the bottom shell 120. In this embodiment, the front shell 110 and the bottom shell 120 are separable or pivotally connected and together define a cavity, which can be opened or closed by the locking mechanism. At the same time, the abutment position of the operating handle 131 and the trigger button 132 in this embodiment is located within the cavity between the front shell 110 and the bottom shell 120. When the alarm is released, the cavity can be opened by the locking mechanism to facilitate the reset of the operating handle 131 and the trigger button 132, restoring the alarm to a state where the alarm is not triggered. In a preferred embodiment of the present invention, for a manually triggered alarm device 100, the trigger mechanism is provided with a structure to prevent automatic reset, such as the handle slot 131-3 in the aforementioned embodiment, to prevent the operating handle 131 from resetting after the external force is removed, causing the trigger button 132 to be opened and the alarm to be canceled. In order to ensure that the automatic reset structure is prevented from being disturbed by the external environment, in a specific embodiment of the present invention, reset cannot be achieved by directly operating the handle 131. In this case, after the alarm disappears, the front shell 110 and the bottom shell 120 can be opened by using the locking mechanism to assist in resetting the trigger mechanism. The specific structural form of the locking mechanism will be explained in detail in subsequent embodiments.

[0054] The position of the locking mechanism is affected by the connection relationship between the front shell 110 and the bottom shell 120. For example, when the alarm device 100 is configured such that the front shell 110 and the bottom shell 120 are detachably connected, the locking mechanism can be disposed on opposite sides of the front shell 110 to ensure stable locking. Figure 3 As shown, the front shell 110 is elastically hinged to one end of the bottom shell 120, and the locking mechanism can be provided on the side opposite to the hinge position. After the lock is released, the front shell 110 can be rotated open relative to the bottom shell 120.

[0055] like Figure 7 and Figure 8 As shown, according to a preferred embodiment of the present invention, the front shell 110 and / or the bottom shell 120 are provided with a buckle 122 and a lock hole 112. The buckle 122 and the lock hole 112 can be provided on the front shell 110 or the bottom shell 120 at the same time, or can be provided on both the front shell 110 and the bottom shell 120. Specifically, as Figure 7 and Figure 8 As shown, the buckle 122 is provided on the bottom shell 120 , and the locking hole 112 is provided on the side of the front shell 110 . The positions of the buckle 122 and the locking hole 112 are set according to the specific structure of the locking mechanism.

[0056] like Figure 7As shown, the locking mechanism includes a mating structure 141 corresponding to the buckle 122. The locking mechanism can be driven to rotate at the position of the lock hole 112 so that the mating structure 141 and the buckle 122 switch between locking and unlocking. Specifically, the mating structure 141 can be configured in the form of a hook that cooperates with the buckle 122. When the locking mechanism rotates, the hook and the buckle 122 are locked or unlocked. According to a preferred embodiment of the present invention, the lock hole 112 can be configured to be driven to rotate by a hexagonal key, which can prevent the locking mechanism from being misactivated and causing the front shell 110 and the bottom shell 120 to separate.

[0057] Further, such as Figure 7 As shown, according to a preferred embodiment of the present invention, a limiting column 113 is further provided on the front shell 110 and / or the bottom shell 120, and a return spring 142 is provided inside the limiting column 113. The return spring 142 is connected to the matching structure 141 and can provide an elastic force to hinder the rotation of the locking mechanism. The limiting column 113 can be configured as a hollow column, one end of the return spring 142 is fixedly connected to the inside of the hollow column, for example, by snapping or bonding, and the other end of the return spring 142 is connected to or abuts against the matching structure 141. When the locking mechanism is driven to rotate through the lock hole 112 position, the return spring 142 is stretched or compressed, accumulating elastic potential energy, generating an elastic force that hinders the rotation of the locking mechanism, and prompting the matching structure 141 and the buckle 122 to maintain a locked state, for example Figure 7 As shown, when the front shell 110 and the bottom shell 120 are locked, driven by external force, the front shell 110 approaches the bottom shell 120, and at the same time, squeezing occurs between the buckle 122 and the matching structure 141, the return spring 142 is compressed, and the matching structure 141 tilts at a certain angle. For example, the locking mechanism has a rotating shaft along the extension line of the lock hole 112, and the matching structure 141 rotates around the rotating shaft. In the process of further pushing the front shell 110 close to the bottom shell 120, the matching structure 141 is clamped and fixed with the buckle 122, completing the locking process of the front shell 110 and the bottom shell 120.

[0058] When the front shell 110 and the bottom shell 120 need to be opened, for example, the trigger mechanism is manually reset, the locking mechanism is driven to rotate through the position of the lock hole 112, the matching structure 141 is disengaged from the buckle 122, and the front shell 110 and the bottom shell 120 are unlocked. Furthermore, according to a preferred embodiment of the present invention, one end of the front shell 110 and the bottom shell 120 are hinged by an elastic pin. Under the action of the elastic pin, when the matching structure 141 and the buckle 122 are unlocked, the front shell 110 and the bottom shell 120 pop open to a certain angle.

[0059] like Figure 7As shown, in the alarm device 100, a support rib 114 is further provided in the front shell 110 and / or the bottom shell 120, and the locking mechanism also includes a latch 143. The position of the support rib 114 corresponds to the position of the latch 143. Furthermore, the latch 143 is located at the other end of the locking mechanism with the matching structure 141 and maintains a fixed relative position, such as being integrally cast. After the locking mechanism rotates a certain angle, the latch 143 abuts against the support rib 114, limiting further rotation of the locking mechanism to prevent the locking mechanism from rotating excessively, resulting in failure of the matching structure 141 and the buckle 122, or the locking mechanism falling off. The support rib 114 can also be configured as a cantilevered elastic structure so that the latch 143 can be engaged in the support rib 114 and maintain a stable position.

[0060] like Figure 1 and Figure 2 As shown, according to a preferred embodiment of the present invention, the alarm device 100 further includes a rear shell 150, which is buckled onto a side of the bottom shell 120 away from the front shell 110, for example, by being fixedly connected by bolts. The circuit board 121 is disposed between the bottom shell and the rear shell 150, and the rear shell 150 provides protection for the circuit board 121. In a specific embodiment of the present invention, the alarm device 100 is fixedly mounted on a mounting surface, such as a vertical wall, and the rear shell 150 is entirely embedded in the mounting surface of the alarm device 100. Preferably, an embedded box is provided in the mounting surface, and the portion of the alarm device 100 protruding from the mounting surface is a portion of the front shell 110, so as to facilitate triggering the operating handle 131 and operating the locking mechanism through the position of the lock hole 112.

[0061] like Figure 1 As shown, according to a preferred embodiment of the present invention, the alarm device 100 further includes a light guide 160 mounted on the front housing 110 and the bottom housing 120. When an alarm occurs, upon triggering the alarm device 100, an indicator light within the alarm device 100 illuminates, signaling the alarm signal through the light guide 160, providing an effective alarm effect and allowing for rapid location of the alarm device 100. Furthermore, the light guide 160 is a two-stage structure, providing greater flexibility in positioning. For alarm devices 100 in which the front housing 110 and bottom housing 120 are rotatably connected, the two-stage structure is more suitable for rotating with the front housing 110 while maintaining structural stability.

[0062] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An alarm device comprising: front shell; A bottom shell, wherein the front shell and the bottom shell are detachably or pivotally connected and together define a cavity, and a circuit board is further provided on the bottom shell; and A trigger mechanism, comprising: an operating handle configured to be driven to rotate relative to the front housing; a trigger button, the trigger button being disposed between the front housing and the bottom housing and connected to the circuit board; the operating handle abutting the trigger button, and the abutting position of the operating handle and the trigger button being located within the cavity defined by the front housing and the bottom housing; when the operating handle rotates relative to the front housing, the trigger button switches between open and closed, and when the trigger button is in the closed state, an alarm signal is issued via the circuit board; and a handle reset structure connected to the front housing and the operating handle and configured to provide an elastic force resisting rotation of the operating handle relative to the front housing; The operating handle includes: A contact portion, the contact portion being a raised structure and abutting against the trigger button; A rotating shaft, the operating handle can rotate around the rotating shaft, and the handle reset structure is a torsion spring, which is sleeved on the rotating shaft; and The handle slot rotates synchronously with the operating handle around the rotation axis, and when the trigger button is in a closed state, the trigger button is engaged with the handle slot. 2 . The alarm device according to claim 1 , wherein the front shell is provided with a handle pressing plate, and the handle pressing plate confines the contact portion within a cavity defined by the front shell and the bottom shell. 3 . The alarm device according to claim 1 , further comprising a locking mechanism disposed between the front case and the bottom case and configured to controllably lock and unlock the front case and the bottom case.

4. The alarm device according to claim 3, wherein the front shell and / or the bottom shell are provided with a buckle and a lock hole, the locking mechanism includes a mating structure corresponding to the buckle, and the locking mechanism is configured to be driven to rotate at the position of the lock hole so that the mating structure and the buckle can switch between locking and unlocking.

5. The alarm device according to claim 4, wherein the front shell and / or the bottom shell are provided with a limiting column, a return spring is provided in the limiting column, the return spring is connected to the matching structure, and is configured to provide an elastic force that hinders the rotation of the locking mechanism.

6. The alarm device according to claim 4, wherein the front shell and / or the bottom shell are provided with support ribs, the locking mechanism further comprises a latch, the position of the support rib corresponds to the position of the latch, and after the locking mechanism rotates a certain angle, the latch abuts against the support rib to limit the rotation of the locking mechanism.

7. The alarm device according to any one of claims 1-6 further includes a rear shell, which is buckled on the side of the bottom shell away from the front shell, and the circuit board is arranged between the bottom shell and the rear shell; the rear shell is entirely embedded in the installation surface of the alarm device.

8. The alarm device according to any one of claims 1 to 6, further comprising a light guide column, wherein the light guide column is installed on the front shell and the bottom shell.

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