Light reflection type smoke detection device

Abstract

The utility model belongs to the field of detection, and discloses a light reflection type smoke detection device, which comprises a cabinet body comprising a bottom plate provided with a support; the cavity is connected with the bracket; a rotating disc and a rotating shaft are arranged in the cavity; the laser assembly comprises a laser transmitter, a first concave lens and a second concave lens, the rotating shaft extends into the laser transmitter and is rotationally connected with the first concave lens and the second concave lens, the concave degree of the second concave lens is larger than that of the first concave lens, and the first concave lens and the second concave lens both comprise a folding state and an opening state; and the receiving assembly is arranged on the support around the cavity, the receiving assembly is rotationally connected with the rotating disc, and when the receiving assembly does not receive a laser signal transmitted by the laser transmitter, the receiving assembly drives the rotating disc to rotate, so that the rotating shaft is driven to enable the first concave lens to be switched to be in a folded state and the second concave lens to be in an opened state. According to the utility model, the performance of the fire alarm system can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of detection, in particular to a light reflection type smoke detection device. Background Art

[0002] Smoke detection devices are crucial in modern fire alarm systems. These devices determine the presence of a fire by monitoring the scattering of a laser beam by smoke. Existing light-reflecting smoke detection devices typically maintain only one detection state. Specifically, these devices typically have a fixed optical component configuration. Once the system is installed and configured, this fixed configuration remains in place throughout the device's lifecycle. For example, a laser emitter may always emit at a fixed angle and direction, while a concave mirror also reflects the laser at a fixed angle and position. This fixed configuration offers the advantages of a simple structure and low operating and maintenance costs, but a fixed-state detection system cannot adapt to changing environmental conditions. In practice, fluctuations in smoke concentration and varying light interference can lead to insufficient detection sensitivity. Due to the fixed angle and position of optical components such as the concave mirror, the device may not provide optimal detection results under varying smoke concentrations, increasing the risk of false alarms or missed alarms.

[0003] Therefore, there is an urgent need to provide a new light reflection type smoke detection device to solve the above problems existing in the prior art. Utility Model Content

[0004] The main purpose of the utility model is to provide a light reflection type smoke detection device, aiming to solve the technical problem that the existing detection devices are insufficient in environmental adaptability.

[0005] To achieve the above objectives, the present invention provides a light reflection type smoke detection device, comprising:

[0006] A bottom plate, wherein a bracket is provided on the bottom plate;

[0007] A cavity is connected to the bracket. A rotating disk and a rotating shaft are provided in the cavity. The rotating disk is provided inside the cavity and extends into the bracket. The rotating shaft passes through the center of the rotating disk and can rotate with the rotating disk.

[0008] A laser assembly comprising a laser emitter, a first concave mirror, and a second concave mirror, wherein the laser emitter is disposed at an end of the cavity away from the bracket, the rotating shaft extends into the interior of the laser emitter and is rotatably connected to the first and second concave mirrors, wherein the second concave mirror is more concave than the first concave mirror, and the first and second concave mirrors both have a folded state and an open state;

[0009] A receiving component is arranged on the bracket around the cavity, and the receiving component is rotatably connected to the rotating disk. When the receiving component does not receive the laser signal emitted by the laser transmitter, the receiving component drives the rotating disk to rotate, thereby driving the rotating shaft to switch the first concave mirror to a folded state and the second concave mirror to an open state.

[0010] Furthermore, a plurality of grooves are provided on the bracket around the cavity, and the receiving assembly is provided in the grooves and connected to the inner wall of the grooves close to the rotating disk.

[0011] Furthermore, a through hole is provided at the connection between the bracket and the receiving component. The receiving component includes a sensing mechanism and a driving mechanism. The driving mechanism passes through the through hole and is rotationally connected to the rotating disk. The sensing mechanism is electrically connected to the driving mechanism.

[0012] Furthermore, an alarm mechanism is included, which includes an alarm light and a buzzer. The alarm light and buzzer are arranged on one end of the bracket away from the base plate and are electrically connected to the receiving component.

[0013] Furthermore, the rotating disk includes a first rotating wheel, and a plurality of tooth surfaces are provided on the circumference of the first rotating wheel, and the tooth surfaces are connected to the driving mechanism.

[0014] Furthermore, the rotating disk includes a second rotating wheel, the alarm mechanism is connected to the second rotating wheel, the second rotating wheel includes a plurality of protrusions, and the alarm mechanism includes a contact switch that cooperates with the protrusions. When the second rotating wheel rotates to a specific position, the contact switch is activated, thereby triggering the alarm light and buzzer to send an alarm signal.

[0015] Furthermore, an accommodating cavity is provided on the outer surface of the laser emitter, and the accommodating cavity is communicated with the inner wall of the laser emitter, and the accommodating cavity is used to accommodate the first concave mirror or the second concave mirror when it is in a folded state.

[0016] Furthermore, the receiving component includes a photosensor, and the photosensor is electrically connected to the driving mechanism.

[0017] Beneficial effects:

[0018] This utility model discloses a light-reflecting smoke detection device that utilizes concave mirrors with varying degrees of concavity, enabling adjustment of detection sensitivity based on actual environmental conditions. Specifically, by coordinating a rotating disk and a rotating shaft, the laser beam emitted by the laser emitter is reflected by concave mirrors of varying degrees of concavity, enabling accurate detection of smoke of varying concentrations. When smoke concentration is low, the laser beam is reflected by the first concave mirror with a smaller degree of concavity, thereby increasing the detection range. When smoke concentration is high, the laser beam is reflected by the second concave mirror with a larger degree of concavity, allowing for more focused laser light and improved accuracy.

[0019] In summary, the present invention provides a light reflection type smoke detection device with high environmental adaptability and high detection accuracy, which can effectively improve the performance of the fire alarm system and protect people's lives and property safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of a light reflection type smoke detection device according to an embodiment of the present invention;

[0021] Figure 2 This is a structural diagram of a light reflection type smoke detection device according to another embodiment of the present invention;

[0022] Figure 3 This is a side structural diagram of a light reflection type smoke detection device according to another embodiment of the present invention;

[0023] Figure 4 The figure is a schematic cross-sectional view of the laser assembly of a light reflection type smoke detection device according to one embodiment of the present invention.

[0024] Among them: 11. Base plate; 12. Bracket; 2. Cavity; 21. Rotating disk; 22. First rotating wheel; 23. Second rotating wheel; 24. Rotating shaft; 3. Laser assembly; 31. Laser emitter; 32. First concave mirror; 33. Second concave mirror; 4. Receiving assembly; 41. Sensing mechanism; 42. Driving mechanism; 5. Groove; 6. Alarm mechanism; 61. Alarm light; 62. Buzzer; 7. Accommodating cavity.

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] 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 directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0028] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0029] 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 include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0030] Reference Figures 1 to 4In one embodiment of the present invention, a light reflection type smoke detection device includes: a bottom plate 11, on which a bracket 12 is provided; a cavity 2, which is connected to the bracket 12; a rotating disk 21 and a rotating shaft 24 are provided in the cavity 2, the rotating disk 21 is provided inside the cavity 2 and extends into the bracket 12, the rotating shaft 24 is provided through the center of the rotating disk 21 and can rotate with the rotating disk 21; a laser assembly 3, including a laser emitter 31, a first concave mirror 32 and a second concave mirror 33, the laser emitter 31 is provided at an end of the cavity 2 away from the bracket 12, the rotating shaft 24 extends into the laser emitter 31 and is rotatably connected to the first concave mirror 32 and the second concave mirror 33, wherein the degree of concavity of the second concave mirror 33 is greater than that of the first concave mirror 32, and the first concave mirror 32 and the second concave mirror 33 both include a folded state and an open state; a receiving component 4, the receiving component 4 is arranged on the bracket 12 around the cavity 2, and the receiving component 4 is rotatably connected to the rotating disk 21. When the receiving component 4 does not receive the laser signal emitted by the laser emitter 31, the receiving component 4 drives the rotating disk 21 to rotate, thereby driving the rotating shaft 24 to switch the first concave mirror 32 to the folded state and the second concave mirror 33 to the open state.

[0031] In this embodiment, a concave mirror design with multiple angles is employed, enabling adjustment of detection sensitivity based on actual environmental conditions. Through the coordination of the rotating disk 21 and the rotating shaft 24, the laser beam emitted by the laser emitter 31 can be reflected by concave mirrors of varying degrees of concavity, thereby enabling accurate detection of smoke of varying concentrations. When smoke concentration is low, the laser beam is reflected by the first concave mirror 32, which has a smaller concave depth, thereby increasing the detection range. When smoke concentration is high, the laser beam is reflected by the second concave mirror 33, which has a larger concave depth, thereby enhancing focus and precision. Specifically, the base plate 11 and the bracket 12 are fixed to the base plate 11, providing mounting space for the chamber 2, the rotating disk 21, and the rotating shaft 24. The chamber 2 accommodates the rotating disk 21, the rotating shaft 24, the laser assembly 3, and the receiving assembly 4. The rotating disk 21 is mounted within the chamber 2 and connected to the rotating shaft 24. The rotation of the rotating disk 21 is controlled by the receiving assembly 4. When the receiving assembly 4 does not receive a laser signal, the rotating disk 21 rotates the rotating shaft 24, thereby switching the state of the concave mirror. The laser assembly 3 includes a laser emitter 31, a first concave mirror 32 and a second concave mirror 33. The laser emitter 31 is located at one end of the cavity 2 and can emit a stable laser beam. The first concave mirror 32 and the second concave mirror 33 are respectively rotatably connected to the rotating shaft 24, and the state switching is achieved by the rotation of the rotating disk 21. The first concave mirror 32 has a smaller degree of concavity and a wider range of emitted laser light, which is suitable for the detection of low-concentration smoke. The second concave mirror 33 has a larger degree of concavity and a more concentrated emitted laser light, which is suitable for the detection of high-concentration smoke. The receiving assembly 4 is arranged on the bracket 12 around the cavity 2 and is capable of receiving the laser signal emitted by the laser emitter 31. When the receiving assembly 4 does not receive the laser signal, it drives the rotating disk 21 to rotate, thereby driving the rotating shaft 24 to switch the first concave mirror 32 to a folded state and the second concave mirror 33 to an open state. The receiving assembly 4 generally includes a photodetector and a signal processing circuit, which can accurately detect the presence or absence of the laser signal and convert the signal into an electrical signal for processing. It should be noted that in the default state, the first concave mirror 32 is in an open state and the second concave mirror 33 is in a folded state, ensuring that the device has a wide detection range under normal circumstances. Through this design, the light reflection smoke detection device can adjust the detection sensitivity according to the actual environmental conditions, achieving accurate detection of smoke of different concentrations.

[0032] In one embodiment, a first concave mirror 32 is positioned within the laser emitter 31 at one end near the cavity 2, and a second concave mirror 33 is positioned in front of the first concave mirror 32. A rotating shaft 24 extends into the laser emitter 31, and the cross-section of the rotating shaft 24 is connected to the cross-sections of the first and second concave mirrors 32, 33. This means that when the first and second concave mirrors 32, 33 are in an open position, they fit tightly with the cross-section of the rotating shaft 24. When the first and second concave mirrors 32, 33 are in a folded position, the rotating shaft 24 drives the cross-section of the first or second concave mirror 32, 33 upward, causing the reflective surface of the mirror to no longer align with the laser beam. When the receiving assembly 4 fails to receive the laser signal emitted by the laser emitter 31, it indicates that the smoke concentration is high and the reflected laser signal is unable to reach the receiving assembly 4 due to diffusion. At this point, the receiving assembly 4 drives the rotating disk 21 to rotate, causing the rotating shaft 24 to rotate accordingly, causing the cross-section of the first concave mirror 32 to flip upward, entering the folded position, and the cross-section of the second concave mirror 33 to flip downward, entering the open position. The second concave mirror 33 is relatively concave, which can focus the laser beam more closely, thereby improving the sensitivity and accuracy of detecting high-concentration smoke.

[0033] In one embodiment, reference Figure 4 Since the laser light source is set above the rotating shaft 24, Figure 4 In the figure, the first concave mirror 32 is located above the rotating shaft 24, and the second concave mirror 33 is located below the rotating shaft 24. In this case, the first concave mirror 32 is open, and the second concave mirror 33 is folded. When the smoke concentration is low, the laser beam is first reflected by the first concave mirror 32. Because the first concave mirror 32 is less concave, the laser beam is scattered more widely, covering a larger detection area. This design enables the device to have a higher detection range under low smoke concentration conditions, enabling timely detection of potential fire hazards. As the smoke concentration gradually increases, after the laser beam is reflected by the first concave mirror 32, part of the laser signal may be absorbed or scattered by smoke particles, resulting in the receiving component 4 not receiving sufficient laser signal. At this time, the receiving component 4 drives the rotating disk 21 to rotate, and the rotating shaft 24 rotates accordingly, causing the cross-section of the first concave mirror 32 to flip downward and enter the folded state, while the cross-section of the second concave mirror 33 flips upward and enters the open state. The laser light source no longer passes through the first concave mirror 32 but passes through the second concave mirror 33. The second concave mirror 33 is more concave, which can make the laser beam more focused, thereby improving the sensitivity and accuracy of high-concentration smoke detection. It is worth noting that Figure 4 This is just a schematic diagram, and the specific placement positions of the first concave mirror 32 and the second concave mirror 33 are not limited to being placed vertically, and can also be placed on the rotating shaft 24 with a distance between them according to actual requirements.

[0034] In another embodiment, the receiving component 4 includes a photodetector and a signal processing circuit. The photodetector receives the laser signal and converts it into an electrical signal, while the signal processing circuit amplifies, filters, and analyzes the electrical signal. When the intensity of the laser signal received by the photodetector falls below a preset threshold, the signal processing circuit determines that the smoke concentration is high and sends a command to the drive mechanism 42 of the rotating disk 21, causing it to rotate the rotating disk 21, thereby switching the state of the concave mirror. Furthermore, the signal processing circuit can automatically adjust the preset threshold based on environmental changes to accommodate detection requirements in different environments.

[0035] In one embodiment, a plurality of grooves 5 are provided on the bracket 12 around the cavity 2 , and the receiving assembly 4 is disposed in the groove 5 and connected to the inner wall of the groove 5 close to the rotating disk 21 .

[0036] In this embodiment, the provision of multiple grooves 5 allows the receiving assembly 4 to be arranged more closely around the cavity 2, thereby improving the overall compactness and stability of the device. Each groove 5 is equipped with a receiving assembly 4, ensuring that the laser signal can be received from different angles. The grooves 5 also make it easier for the receiving assembly 4 to connect with the inner wall of the rotating disk 21, thereby improving the device's response speed and sensitivity. Because the receiving assembly 4 is distributed within multiple grooves 5, it can achieve omnidirectional laser signal reception, ensuring that smoke can be detected in a timely manner in any direction. The design of the grooves 5 also effectively reduces interference from external light, improving detection accuracy.

[0037] In one embodiment, a through hole is provided at the connection between the bracket 12 and the receiving component 4. The receiving component 4 includes a sensing mechanism 41 and a driving mechanism 42. The driving mechanism 42 passes through the through hole and is rotatably connected to the rotating disk 21. The sensing mechanism 41 is electrically connected to the driving mechanism 42.

[0038] In this embodiment, the through hole makes the connection between the receiving component 4 and the driving mechanism 42 more direct and stable. The sensing mechanism 41 is electrically connected to the driving mechanism 42 through the through hole, ensuring the reliability and response speed of signal transmission. The sensing mechanism 41 is responsible for detecting the presence or absence of the laser signal and transmitting the detection result to the driving mechanism 42. After the driving mechanism 42 receives the signal from the sensing mechanism 41, it will drive the rotating disk 21 to perform corresponding rotation operations according to the signal content, thereby realizing the switching of the concave mirror state. This structural design not only improves the sensitivity of the device, but also ensures the synchronization between the receiving component 4 and the driving mechanism 42 during the detection process, so that the entire device can respond to environmental changes quickly and accurately.

[0039] In one embodiment, an alarm mechanism 6 is further included. The alarm mechanism 6 includes an alarm light 61 and a buzzer 62 . The alarm light 61 and the buzzer 62 are arranged on an end of the bracket 12 away from the base plate 11 and are electrically connected to the receiving component 4 .

[0040] In this embodiment, the alarm mechanism 6 further enhances the functionality of the smoke detection device. When the receiving component 4 detects high smoke concentrations and confirms the need for an alarm, an alarm light 61 illuminates and a buzzer 62 sounds a loud alarm. The alarm light 61, typically a high-brightness LED, provides a striking visual warning in a variety of environments, while the buzzer 62 emits a sufficiently loud sound to ensure prompt attention even in noisy environments. The synchronized operation of the alarm light 61 and buzzer 62 provides a more comprehensive alarm message, attracting both visual and auditory attention, thereby improving the efficiency and effectiveness of the alarm.

[0041] In one embodiment, the rotating disk 21 includes a first rotating wheel 22 , and a plurality of tooth surfaces are provided on the circumference of the first rotating wheel 22 . The tooth surfaces are connected to the driving mechanism 42 .

[0042] In this embodiment, the rotating disk 21 includes a first rotating wheel 22, and a plurality of tooth surfaces are provided around the periphery of the first rotating wheel 22. These tooth surfaces cooperate closely with the gears or transmission devices of the driving mechanism 42, ensuring that the rotating disk 21 can rotate smoothly and accurately after receiving the instructions of the driving mechanism 42. In addition, the tooth surface design of the first rotating wheel 22 also allows the device to be switched at different rotation speeds to adapt to the detection requirements in different environments. For example, in a high-concentration smoke environment, it is necessary to quickly switch the concave mirror state to improve the detection sensitivity. At this time, the driving mechanism 42 can provide a higher rotation speed so that the rotating disk 21 can quickly complete the state switching. In a low-concentration smoke environment, the rotation speed can be appropriately reduced to ensure the smoothness of the concave mirror state switching and avoid false alarms caused by rapid switching. Reference Figure 2 In this embodiment, the driving mechanism 42 includes a main motor and an auxiliary motor. One end of the auxiliary motor is connected to the sensing mechanism 41, and the other end is connected to the first rotating wheel 22. The main motor is connected to the center of the first rotating wheel 22 and the second rotating wheel 23 through a rotating shaft, ensuring the stable operation of the entire device. The main motor is responsible for providing the main power to drive the first rotating wheel 22 and the second rotating wheel 23 to rotate, while the auxiliary motor is fine-tuned according to the signal of the sensing mechanism 41 to ensure the accurate switching of the concave mirror state.

[0043] In one embodiment, the rotating disk 21 includes a second rotating wheel 23, the alarm mechanism 6 is connected to the second rotating wheel 23, the second rotating wheel 23 includes a plurality of protrusions, and the alarm mechanism 6 includes a contact switch that cooperates with the protrusions. When the second rotating wheel 23 rotates to a specific position, the contact switch is activated, thereby triggering the alarm light 61 and the buzzer 62 to send an alarm signal.

[0044] In this embodiment, the rotating disk 21 includes a second rotating wheel 23, which is connected to the alarm mechanism 6 to ensure timely triggering of the alarm signal. The second rotating wheel 23 is provided with multiple protrusions. When the rotating disk 21 rotates to a specific position, these protrusions engage contact switches in the alarm mechanism 6, thereby activating the alarm light 61 and buzzer 62. This allows the alarm light 61 and buzzer 62 to respond quickly when high smoke concentrations are detected and an alarm is required, providing timely visual and audible warnings. In actual applications, the number and position of the protrusions on the second rotating wheel 23 can be adjusted according to specific needs to accommodate different alarm strategies. For example, in some situations, a faster alarm response may be required. In this case, the number of protrusions can be increased or their positions adjusted to facilitate triggering of the alarm signal. In other situations, to reduce false alarms, the number of protrusions can be appropriately reduced or their positions adjusted to ensure more precise triggering of the alarm signal.

[0045] In one embodiment, a receiving cavity 7 is provided on the outer surface of the laser emitter 31 , and the receiving cavity 7 is communicated with the inner wall of the laser emitter 31 . The receiving cavity 7 is used to receive the first concave mirror 32 or the second concave mirror 33 when the first concave mirror 32 or the second concave mirror 33 is in a folded state.

[0046] In this embodiment, a housing cavity 7 is provided on the outer surface of the laser emitter 31. This housing cavity 7 is connected to the inner wall of the laser emitter 31. Its main function is to provide a safe storage space when the first concave mirror 32 or the second concave mirror 33 is in a folded state. When the concave mirror needs to be switched from an open state to a folded state, that is, when the rotating wheel drives the concave mirror to flip, it can be folded into the housing cavity 7, ensuring that the concave mirror can be accurately positioned in the predetermined position when folding and unfolding, avoiding the misdirection or weakening of the laser beam due to positional deviation. In another embodiment, the inner surface of the housing cavity 7 is coated with a light-absorbing material to reduce the possibility of laser reflection and scattering within the cavity 2, thereby improving the emission efficiency and accuracy of the laser emitter 31. At the same time, the light-absorbing material can also absorb excess heat generated by the laser emitter 31 during operation, helping to maintain stable operation of the equipment.

[0047] In one embodiment, the receiving component 4 includes a photosensor, and the photosensor is electrically connected to the driving mechanism 42 .

[0048] In this embodiment, receiving assembly 4 includes a photosensor. As the core component of sensing mechanism 41, the photosensor is capable of highly sensitive detection of laser signals. The photosensor is electrically connected to drive mechanism 42, ensuring rapid signal transmission and processing. When the laser signal is captured by the photosensor, it transmits an electrical signal to drive mechanism 42. Drive mechanism 42, in response to the received signal, rotates rotating disk 21 accordingly, thereby switching the concave mirror state. The photosensor's sensitivity and response speed directly impact the performance of the entire smoke detection device.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A light reflection type smoke detection device, characterized in that: include: A bottom plate, wherein a bracket is provided on the bottom plate; A cavity is connected to the bracket. A rotating disk and a rotating shaft are provided in the cavity. The rotating disk is provided inside the cavity and extends into the bracket. The rotating shaft passes through the center of the rotating disk and can rotate with the rotating disk. A laser assembly comprising a laser emitter, a first concave mirror, and a second concave mirror, wherein the laser emitter is disposed at an end of the cavity away from the bracket, the rotating shaft extends into the interior of the laser emitter and is rotatably connected to the first and second concave mirrors, wherein the second concave mirror is more concave than the first concave mirror, and the first and second concave mirrors both have a folded state and an open state; A receiving component is arranged on the bracket around the cavity, and the receiving component is rotatably connected to the rotating disk. When the receiving component does not receive the laser signal emitted by the laser transmitter, the receiving component drives the rotating disk to rotate, thereby driving the rotating shaft to switch the first concave mirror to a folded state and the second concave mirror to an open state.

2. The light reflection type smoke detection device according to claim 1, characterized in that: A plurality of grooves are arranged on the bracket around the cavity, and the receiving assembly is arranged in the grooves and connected to the inner wall of the groove close to the rotating disk.

3. The light reflection type smoke detection device according to claim 1, characterized in that: A through hole is provided at the connection between the bracket and the receiving assembly. The receiving assembly includes a sensing mechanism and a driving mechanism. The driving mechanism is rotationally connected to the rotating disk through the through hole. The sensing mechanism is electrically connected to the driving mechanism.

4. The light reflection type smoke detection device according to claim 1, characterized in that: It also includes an alarm mechanism, which includes an alarm light and a buzzer. The alarm light and buzzer are arranged on one end of the bracket away from the bottom plate and are electrically connected to the receiving component.

5. The light reflection type smoke detection device according to claim 3, characterized in that: The rotating disk includes a first rotating wheel. A plurality of tooth surfaces are arranged on the circumference of the first rotating wheel. The tooth surfaces are connected to the driving mechanism.

6. The light reflection type smoke detection device according to claim 4, characterized in that: The rotating disk includes a second rotating wheel, the alarm mechanism is connected to the second rotating wheel, the second rotating wheel includes a plurality of protrusions, and the alarm mechanism includes a contact switch that cooperates with the protrusions. When the second rotating wheel rotates to a specific position, the contact switch is activated, thereby triggering the alarm light and buzzer to send an alarm signal.

7. The light reflection type smoke detection device according to claim 1, characterized in that: An accommodating cavity is provided on the outer surface of the laser emitter, and the accommodating cavity is communicated with the inner wall of the laser emitter. The accommodating cavity is used to accommodate the first concave mirror or the second concave mirror when it is in a folded state.

8. The light reflection type smoke detection device according to claim 3, characterized in that: The receiving component includes a photosensor, and the photosensor is electrically connected to the driving mechanism.

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