Optical beam smoke detector
By designing a combined structure of a back cover and a front cover in the beam smoke detector, and using buttons and drive components to adjust the position of the optical module, the risk of damage during optical module adjustment is eliminated, and safe and efficient position adjustment is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG HUAXIAO TECH CO LTD
- Filing Date
- 2025-08-25
- Publication Date
- 2026-06-23
AI Technical Summary
Existing linear beam smoke detectors are prone to damage when adjusting the position of the optical module. Current technology requires opening the housing for adjustment, which leads to additional risks of damage.
Design a beam smoke detector that adopts a combination structure of a back cover and a front cover. The optical module is installed in the first mounting position of the back cover. Buttons and drive components are electrically connected to the control board. The position of the optical module can be adjusted by operating the drive components through the buttons. The front cover always blocks the optical module to reduce the risk of damage.
When adjusting the position of the optical module, the front cover always blocks the optical module, reducing the risk of damage and improving the safety and debugging efficiency of the optical module.
Smart Images
Figure CN224399941U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of beam smoke detection, and in particular to a beam smoke detector. Background Technology
[0002] A linear beam smoke detector is a type of fire detector that requires a reflector to detect smoke. Specifically, the linear beam smoke detector emits infrared light towards the reflector, which then reflects the received infrared light back to the detector. When smoke appears in the path of the infrared light, smoke particles scatter the light, causing a decrease in the intensity of the reflected infrared light received by the linear beam smoke detector. When the intensity of the reflected infrared light falls below a threshold, an alarm is triggered.
[0003] A linear beam smoke detector specifically includes an optical module, which comprises an infrared emitter and an infrared receiver. The linear beam smoke detector emits infrared light towards a reflector through the infrared emitter, and receives the infrared light reflected back from the reflector through the infrared receiver. It is easy to understand that the relative positional relationship between the optical module and the reflector is crucial to the fire detection sensitivity of the linear beam smoke detector.
[0004] In the existing technology, in order to adjust the position of the optical module inside the linear beam smoke detector so that the relative position between the optical module and the reflector meets the fire monitoring requirements, it is necessary to open the housing of the linear beam smoke detector, exposing the optical module. This results in an additional risk of damage to the optical module. Utility Model Content
[0005] Therefore, it is necessary to provide a beam smoke detector to address the additional risk of damage to the optical module during position adjustment.
[0006] A beam smoke detector, comprising:
[0007] The rear cover has a first mounting position and a second mounting position;
[0008] An optical module is installed at the first mounting position;
[0009] The button is located at the second mounting position;
[0010] A first front cover is fitted onto the first mounting position to at least partially obscure the optical module;
[0011] The second front cover is detachably installed at the second mounting position to at least partially cover the button;
[0012] The control board is electrically connected to the buttons;
[0013] A drive assembly, electrically connected to the control board, is used to adjust the position of the optical module at the first mounting position.
[0014] In some embodiments, a safety cord is provided between the second front cover and the rear cover.
[0015] In some embodiments, the driving component includes:
[0016] A driver is mounted on the rear cover and electrically connected to the control board;
[0017] A first adjusting shaft is driven to the driver to allow the first adjusting shaft to move axially on the rear cover. A limit block is provided on the first adjusting shaft, and a limit groove is provided on the optical module. The limit block is located in the limit groove and is clearance-fitted with the side wall of the limit groove to allow the optical module to deflect relative to the first adjusting shaft.
[0018] The second adjustment shaft is fixedly mounted on the rear cover. The optical module is provided with a first clearance hole. The second adjustment shaft passes through the first clearance hole and is clearance-fitted with the edge of the first clearance hole to allow the optical module to deflect relative to the second adjustment shaft.
[0019] An elastic element is disposed at the second adjustment shaft, and one end of the elastic element abuts against the optical module.
[0020] In some embodiments, a limit cap is provided on the second adjusting shaft, and the other end of the elastic member abuts against the limit cap.
[0021] In some embodiments, a second clearance hole is provided on the side wall of the limiting groove, and the first adjusting shaft passes through the second clearance hole and is clearance-fitted with the edge of the second clearance hole to allow the optical module to deflect relative to the first adjusting shaft.
[0022] In some embodiments, the drive assembly further includes a mounting bracket, the driver is mounted on the mounting bracket, one end of the second adjustment shaft is fixed on the mounting bracket, the optical module is mounted on the mounting bracket and spaced apart from the mounting bracket via the first adjustment shaft and the second adjustment shaft, and the mounting bracket is fixed at the first mounting position.
[0023] In some embodiments, the control panel is provided with an indicator light located at the second mounting position, and the second front cover is provided with a light guide for guiding the light emitted by the indicator light to the outside of the second front cover.
[0024] In some embodiments, the first front cover includes an infrared light-transmitting plate, and the optical module includes an infrared emitter and an infrared receiver, the infrared emitter and the infrared receiver being disposed facing the infrared light-transmitting plate.
[0025] In some embodiments, the first front cover further includes a light-transmitting mirror, the infrared light-transmitting plate is provided with a light-transmitting hole, the light-transmitting mirror is installed at the light-transmitting hole, and the optical module further includes a visible light laser, the visible light laser being disposed toward the light-transmitting hole.
[0026] In some embodiments, the optical module further includes an adjustment bracket on which the infrared emitter, the infrared receiver, and the visible laser are fixed.
[0027] The beneficial effects of this utility model are as follows:
[0028] The back cover has a first mounting position and a second mounting position, wherein the optical module is mounted at the first mounting position and the button is located at the second mounting position.
[0029] The buttons and drive components are electrically connected to the control board. By operating the buttons, the drive components can produce corresponding actions. The actions of the drive components act on the optical module, thereby changing the specific installation position and / or installation angle of the optical module at the first mounting position, so that the position of the optical module can be matched with the reflector set opposite to the beam smoke detector.
[0030] When adjusting the position of the optical module, simply open the second front cover to expose the buttons at the second mounting position, thus allowing button operation. Throughout the adjustment process, the first front cover remains closed at the first mounting position, shielding and protecting the optical module, effectively reducing the risk of damage to the optical module during adjustment. Attached Figure Description
[0031] Figure 1 This is a schematic diagram of the exploded structure of the beam smoke detector in an embodiment of this utility model;
[0032] Figure 2 This is a cross-sectional structural diagram of the beam smoke detector in an embodiment of this utility model;
[0033] Figure 3 This is a schematic diagram of the main structure of the beam smoke detector after the second front cover has been removed in an embodiment of this utility model;
[0034] Figure 4 This is a schematic diagram of the three-dimensional structure of the drive component and optical module after assembly in an embodiment of this utility model. Figure 1 ;
[0035] Figure 5This is a schematic diagram of the three-dimensional structure of the drive component and optical module after assembly in an embodiment of this utility model. Figure 2 ;
[0036] Figure 6 This is a schematic diagram of the three-dimensional structure of the drive component and optical module after assembly in an embodiment of this utility model. Figure 3 ;
[0037] Figure 7 This is a schematic diagram of the operation of the driving component when the optical module deflects up and down in an embodiment of this utility model;
[0038] Figure 8 This is a schematic diagram of the operation of the driving component when the optical module deflects left and right in an embodiment of this utility model.
[0039] Figure label:
[0040] 1. Rear cover; 11. First mounting position; 12. Second mounting position; 2. Optical module; 21. Limiting groove; 22. First clearance hole; 23. Infrared transmitter; 24. Infrared receiver; 25. Visible laser; 26. Adjustment bracket; 3. Button; 4. First front cover; 41. Infrared light-transmitting plate; 42. Light-transmitting lens; 43. Face frame; 5. Second front cover; 51. Light guide; 6. Control board; 61. Indicator light; 7. Drive assembly; 71. Driver; 72. First adjustment shaft; 721. Limiting block; 73. Second adjustment shaft; 731. Limiting cap; 74. Elastic element; 75. Mounting bracket; 8. Anti-drop rope. Detailed Implementation
[0041] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.
[0042] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0043] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0045] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0046] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0047] Example:
[0048] like Figures 1-3 As shown, this embodiment provides a beam smoke detector. The beam smoke detector and the reflector are arranged opposite each other, and the distance between them is generally far, such as more than 10m.
[0049] The beam smoke detector includes an optical module 2, which comprises an infrared emitter 23 and an infrared receiver 24. During maintenance and debugging, the installation position and / or angle of the optical module 2 need to be adjusted. This adjustment requires ensuring that the infrared light emitted by the infrared emitter 23 reaches the reflector, and that the reflector reflects the infrared light to the infrared receiver 24. Furthermore, the power of the infrared light emitted by the emitter 23 and the power of the infrared light received by the receiver 24 should be as close as possible. When the installation position and / or angle of the optical module 2 meet these requirements, it can be considered properly adjusted, and its positional state meets the operational requirements.
[0050] The beam smoke detector includes a rear cover 1 and a first front cover 4. The rear cover 1 has a first mounting position 11, and the optical module 2 is mounted at the first mounting position 11. The first front cover 4 covers the first mounting position 11, thereby enabling the first front cover 4 to at least partially shield and protect the optical module 2.
[0051] For example, the first front cover 4 is detachably mounted on the rear cover 1.
[0052] During the process of assembling and disassembling the optical module 2 to the first mounting position 11, the first front cover 4 and the rear cover 1 remain separated. This allows the first front cover 4 to avoid obstructing the optical module 2, and the optical module 2 has sufficient space to be assembled and disassembled at the first mounting position 11.
[0053] During the maintenance and debugging of the beam smoke detector, the optical module 2 is already located at the first mounting position 11. Only the position of the optical module 2 needs adjustment; there is no need to disassemble or reassemble the entire optical module 2. Therefore, throughout the debugging process, the first front cover 4 can remain closed on the first mounting position 11 without needing to be removed. In other words, the first front cover 4 can continuously protect and shield the optical module 2 throughout the maintenance and debugging process, thereby reducing the risk of damage to the optical module 2 and improving its safety.
[0054] During the debugging process, in order to determine whether the position of the optical module 2 has been properly adjusted, the first front cover 4 needs to allow the infrared light emitted by the infrared emitter 23 to be transmitted to the reflector, and at the same time, it needs to allow the infrared light reflected by the reflector to be transmitted to the infrared receiver 24.
[0055] Based on this, the first front cover 4 in this embodiment includes at least an infrared light-transmitting plate 41. The infrared light-transmitting plate 41 can act as a filter and only allows infrared light to pass through. The infrared emitter 23 and the infrared receiver 24 are arranged facing the infrared light-transmitting plate 41. In this way, the infrared light emitted by the infrared emitter 23 can be directed to the reflector through the infrared light-transmitting plate 41, and the infrared light reflected by the reflector can also be directed to the infrared receiver 24 through the infrared light-transmitting plate 41.
[0056] In this embodiment, the first front cover 4 also includes a frame 43, and an infrared light-transmitting plate 41 is installed in the middle of the frame 43. The frame 43 is made of a non-transparent material, and the infrared light-transmitting plate 41 is covered by the frame 43 at the first mounting position 11.
[0057] Preferably, the first front cover 4 also includes a light-transmitting mirror 42. The infrared light-transmitting plate 41 is provided with a light-transmitting hole, and the light-transmitting mirror 42 is installed at the light-transmitting hole and allows visible light to pass through. The optical module 2 also includes a visible light laser 25, which is positioned facing the light-transmitting hole. The visible light laser emitted by the visible light laser 25 can be directed to the outside of the first front cover 4 through the light-transmitting mirror 42.
[0058] During maintenance, the maintenance personnel first visually adjust the position of the optical module 2 by observing the position of the light spot formed by the visible light laser on the outer side of the first front cover 4. This allows for quick and approximate alignment of the optical module 2 and the reflector, ensuring that the infrared light emitted by the infrared emitter 23 reaches the reflector. Then, the position of the optical module 2 is finely adjusted to reduce the difference between the infrared light power emitted by the infrared emitter 23 and the infrared light power received by the infrared receiver 24. By performing both coarse and fine adjustments to the position of the optical module 2, the debugging efficiency of the optical module 2 can be effectively improved.
[0059] For example, the optical module 2 in this embodiment also includes an adjustment bracket 26, on which the infrared emitter 23, the infrared receiver 24 and the visible light laser 25 are fixed.
[0060] During maintenance and debugging, the optical module 2 is obstructed by the first front cover 4, so maintenance personnel do not have enough space to directly adjust the position of the optical module 2. Therefore, the beam smoke detector in this embodiment further includes a button 3, a second front cover 5, a control board 6 and a drive assembly 7, while the rear cover 1 has a second mounting position 12, which is spaced apart from the first mounting position 11.
[0061] Both the control board 6 and the drive assembly 7 are mounted on the rear cover 1. The button 3 is electrically connected to the control board 6, which in turn is electrically connected to the drive assembly 7, which transmits power to the optical module 2. By operating the button 3, a corresponding signal can be sent to the control board 6. Based on the received signal, the control board 6 can control the drive assembly 7 to perform corresponding actions. Therefore, even when the optical module 2 is obstructed by the first front cover 4, the drive assembly 7 can adjust the position (installation position and / or installation angle) of the optical module 2 at the first mounting position 11.
[0062] Furthermore, button 3 is located at the second mounting position 12, and the second front cover 5 is detachably mounted at the second mounting position 12.
[0063] During non-maintenance and debugging periods, the second front cover 5 closes at the second mounting position 12, thereby shielding and protecting the button 3. Simultaneously, the second front cover 5, the first front cover 4, and the rear cover 1 form a relatively enclosed cavity, ensuring complete shielding and protection for the drive assembly 7 and the control board 6. The control board 6 is equipped with an indicator light 61 located at the second mounting position 12. The second front cover 5 is equipped with a light guide 51. When the second front cover 5 is closed at the second mounting position 12, the light guide 51 directs the light emitted by the indicator light 61 outside the second front cover 5, thus indicating the smoke detection status.
[0064] During maintenance and debugging, the second front cover 5 needs to be removed from the second mounting position 12 to expose the button 3, thus facilitating operation of the button 3 by maintenance personnel. Since the button 3 is located at the second mounting position 12, the operation of the button 3 by maintenance personnel will not be interfered with by the first front cover 4. Consequently, maintenance personnel do not need to remove the first front cover 4 when operating the button 3, ensuring that the optical module 2 is protected by the first front cover 4 during maintenance and debugging.
[0065] Preferably, an anti-drop rope 8 is provided between the second front cover 5 and the rear cover 1. Since the beam smoke detector is installed at a high position, during maintenance and debugging, when the second front cover 5 is removed from the second mounting position 12, the anti-drop rope 8 can prevent the second front cover 5 from falling directly to the ground, thereby improving the safety during maintenance and debugging.
[0066] like Figures 4-6 As shown, by way of example, the drive component 7 in this embodiment includes a driver 71, a first adjusting shaft 72, a second adjusting shaft 73, an elastic element 74, and a mounting bracket 75.
[0067] The mounting bracket 75 is generally flat. One side of the mounting bracket 75 is fixed to the side wall of the rear cover 1 at the first mounting position 11. The driver 71, the first adjusting shaft 72, the second adjusting shaft 73, and the elastic element 74 are located on the other side of the mounting bracket 75. The driver 71 and the second adjusting shaft 73 are mounted on the rear cover 1 via the mounting bracket 75.
[0068] Specifically, the driver 71 can be fixed to the mounting bracket 75 with screws. The driver 71 can be electrically connected to the control board 6 via wires. The control board 6 controls the driver 71 to perform corresponding actions based on the signals sent by the button 3. The first adjusting shaft 72 is driven to the driver 71. In this embodiment, the axis of the first adjusting shaft 72 extends in the front-rear direction. The driver 71 can control the first adjusting shaft 72 to move axially on the rear cover 1. The specific structure and method of the driver 71 controlling the axial movement of the first adjusting shaft 72 are existing technologies and will not be described in detail in this embodiment.
[0069] The first adjusting shaft 72 is provided with a limiting block 721, and the adjusting bracket 26 is provided with a limiting groove 21. The limiting block 721 is located within the limiting groove 21. Thus, when the first adjusting shaft 72 moves along its own axial direction, at least the portion of the optical module 2 at the limiting groove 21 can move along the axial direction of the first adjusting shaft 72. It is particularly noteworthy that the limiting block 721 also has a clearance fit with the side wall of the limiting groove 21. This clearance allows the optical module 2 to deflect relative to the first adjusting shaft 72.
[0070] For example, in this embodiment, a second clearance hole is provided on the side wall of the limiting groove 21, and the first adjusting shaft 72 passes through the second clearance hole and is in clearance fit with the edge of the second clearance hole. With the cooperation of the clearance between the limiting block 721 and the side wall of the limiting groove 21 and the clearance between the first adjusting shaft 72 and the second clearance hole, the optical module 2 is allowed to deflect relative to the first adjusting shaft 72.
[0071] One end of the second adjusting shaft 73 is fixedly mounted on the mounting bracket 75, and then fixed to the rear cover 1 by the mounting bracket 75. The second adjusting shaft 73 is spaced apart from the driver 71. In this embodiment, the axis of the second adjusting shaft 73 also extends in the front-rear direction. Specifically... Figure 6 As shown, the adjustment bracket 26 is provided with a first clearance hole 22, and the second adjustment shaft 73 passes through the first clearance hole 22. At the same time, the second adjustment shaft 73 also has a clearance fit with the edge of the first clearance hole 22, thereby allowing the optical module 2 to deflect relative to the second adjustment shaft 73.
[0072] An elastic element 74 is disposed at the second adjusting shaft 73, with one end of the elastic element 74 abutting against the adjusting bracket 26. In some other embodiments, the other end of the elastic element 74 may abut against the mounting bracket 75. In this embodiment, the elastic element 74 is specifically a spring, which is sleeved on the second adjusting shaft 73. A limit cap 731 is provided at the end of the second adjusting shaft 73 away from the mounting bracket 75, and the other end of the elastic element 74 abuts against the limit cap 731.
[0073] With this design, the optical module 2 can be mounted on the mounting bracket 75 and spaced apart from it via the first adjustment shaft 72 and the second adjustment shaft 73. When the position of the optical module 2 is not adjusted, it can be positioned on the drive assembly 7 based on the limiting action of the limiting block 721 and the squeezing action of the elastic member 74. When the position of the optical module 2 changes, the mounting bracket 75 can avoid the optical module 2 by maintaining a distance from it.
[0074] It is understood that the driver 71 and the first adjusting shaft 72 are in a one-to-one correspondence, and the second adjusting shaft 73 and the elastic element 74 are in a one-to-one correspondence. In this embodiment, there are two drivers 71 and two adjusting shafts 73. One driver 71 and one second adjusting shaft 73 are arranged horizontally on the mounting bracket 75, and the other driver 71 and the other second adjusting shaft 73 are arranged vertically on the mounting bracket 75.
[0075] Examples such as Figure 7 As shown, when the first adjustment shaft 72 at the top moves backward, the top of the optical module 2 also begins to move backward, while at the same time, the bottom of the optical module 2 moves forward under the action of the elastic member 74. Conversely, when the first adjustment shaft 72 at the top moves forward, the top of the optical module 2 also begins to move forward, while at the same time, the bottom of the optical module 2 squeezes the elastic member 74 and moves backward. In this way, by moving the first adjustment shaft 72 at the top back and forth, the optical module 2 can be controlled to deflect up and down.
[0076] Examples such as Figure 8 As shown, when the first adjustment shaft 72 on the left moves forward, the left side of the optical module 2 also begins to move forward. Simultaneously, the right side of the optical module 2 compresses the elastic element 74 and moves backward. Conversely, when the first adjustment shaft 72 on the left moves backward, the left side of the optical module 2 also begins to move backward, while the right side of the optical module 2 moves forward under the action of the elastic element 74. By moving the first adjustment shaft 72 on the left forward and backward, the optical module 2 can be controlled to deflect left and right.
[0077] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0078] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A beam smoke detector, characterized in that, include: The rear cover (1) has a first mounting position (11) and a second mounting position (12); An optical module (2) is installed at the first mounting position (11); Button (3) is located at the second mounting position (12); A first front cover (4) is fitted onto the first mounting position (11) to at least partially obscure the optical module (2); The second front cover (5) is detachably installed at the second mounting position (12) to at least partially cover the button (3); The control board (6) is electrically connected to the button (3); The drive assembly (7) is electrically connected to the control board (6) and is used to adjust the position of the optical module (2) at the first mounting position (11).
2. The beam smoke detector according to claim 1, characterized in that, An anti-drop rope (8) is provided between the second front cover (5) and the rear cover (1).
3. The beam smoke detector according to claim 1, characterized in that, The driving component (7) includes: A driver (71) is mounted on the rear cover (1) and electrically connected to the control board (6). A first adjusting shaft (72) is driven to the driver (71) to allow the first adjusting shaft (72) to move axially on the rear cover (1). A limiting block (721) is provided on the first adjusting shaft (72), and a limiting groove (21) is provided on the optical module (2). The limiting block (721) is located in the limiting groove (21) and is clearance-fitted with the side wall of the limiting groove (21) to allow the optical module (2) to deflect relative to the first adjusting shaft (72). The second adjustment shaft (73) is fixedly mounted on the rear cover (1). The optical module (2) is provided with a first clearance hole (22). The second adjustment shaft (73) passes through the first clearance hole (22) and is fitted with the edge clearance of the first clearance hole (22) to allow the optical module (2) to deflect relative to the second adjustment shaft (73). An elastic element (74) is disposed at the second adjustment shaft (73), and one end of the elastic element (74) abuts against the optical module (2).
4. The beam smoke detector according to claim 3, characterized in that, A limit cap (731) is provided on the second adjusting shaft (73), and the other end of the elastic member (74) abuts against the limit cap (731).
5. The beam smoke detector according to claim 3, characterized in that, A second clearance hole is provided on the side wall of the limiting groove (21), and the first adjusting shaft (72) passes through the second clearance hole and is fitted with the edge clearance of the second clearance hole to allow the optical module (2) to deflect relative to the first adjusting shaft (72).
6. The beam smoke detector according to claim 3, characterized in that, The drive assembly (7) further includes a mounting bracket (75), the driver (71) is mounted on the mounting bracket (75), one end of the second adjustment shaft (73) is fixed on the mounting bracket (75), the optical module (2) is mounted on the mounting bracket (75) through the first adjustment shaft (72) and the second adjustment shaft (73) and is spaced apart from the mounting bracket (75), and the mounting bracket (75) is fixed at the first mounting position (11).
7. The beam smoke detector according to claim 1, characterized in that, The control board (6) is provided with an indicator light (61), which is located at the second mounting position (12). The second front cover (5) is provided with a light guide (51), which is used to guide the light emitted by the indicator light (61) to the outside of the second front cover (5).
8. The beam smoke detector according to claim 1, characterized in that, The first front cover (4) includes an infrared light-transmitting plate (41), and the optical module (2) includes an infrared emitter (23) and an infrared receiver (24), with the infrared emitter (23) and the infrared receiver (24) facing the infrared light-transmitting plate (41).
9. The beam smoke detector according to claim 8, characterized in that, The first front cover (4) also includes a light-transmitting mirror (42), and the infrared light-transmitting plate (41) is provided with a light-transmitting hole. The light-transmitting mirror (42) is installed at the light-transmitting hole. The optical module (2) also includes a visible light laser (25), and the visible light laser (25) is arranged facing the light-transmitting hole.
10. The beam smoke detector according to claim 9, characterized in that, The optical module (2) also includes an adjustment bracket (26), on which the infrared emitter (23), the infrared receiver (24) and the visible light laser (25) are fixed.