Fire alarm device with protection function

Abstract

The invention discloses a fire alarm device with a protection function, and relates to the technical field of fire alarms. The invention provides a fire alarm device with a protection function, which comprises a mounting shell and the like, the mounting shell is fixedly connected with an induction alarm, the mounting shell is fixedly connected with a storage box body, the storage box body is slidably connected with a push plate, paired force storage elastic sheets are fixedly connected between the push plate and the storage box body, the mounting shell is fixedly connected with a pull rope, the push plate is also fixedly connected with a pull rope, and the pull rope is fixedly connected with the storage box body. The other ends of the paired pull ropes are fixedly connected with magnetic blocks, a wax sealing block is fixedly connected between the paired magnetic blocks, the storage box body is fixedly connected with a spraying barrel, and the push plate is fixedly connected with a blocking block. Through parts such as a push plate and a spray cylinder, carbon dioxide gas can be automatically generated through chemical reaction when a fire occurs, and the periphery of the mounting shell is filled with the carbon dioxide gas, so that the situation that the fire spreads to the induction alarm and damages the induction alarm is avoided, and the alarm effect of the induction alarm is guaranteed; and the service life of the fire alarm is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of fire alarms, and in particular to a fire alarm device with a protective function. Background Art

[0002] A fire alarm is a device used to detect the early characteristics of a fire (such as smoke, heat, flames or gas) and sound an alarm, with the aim of promptly alerting people to evacuate and initiate fire-fighting measures. Its core types include smoke detectors and temperature detectors: smoke detectors detect smoke particles in the air through optical or electrochemical principles and activate alarms; temperature detectors use thermistors to monitor ambient temperature and trigger an alarm when the temperature reaches a preset threshold or rises abnormally. Such devices are widely used in residential, commercial buildings and industrial sites. They are key equipment for fire prevention and reducing casualties, and require regular maintenance to ensure sensitivity and reliability.

[0003] The shell of an existing fire alarm is usually made of materials such as plastic. Therefore, when a fire occurs, the inside of the fire alarm is damaged quickly due to the high temperature, and the shell is also easily burned by the fire, resulting in a shorter alarm time and poor overall alarm effect. Although some fire alarms have a certain self-cooling protection function, this function mainly relies on external power drive. Once the power supply line is disconnected due to the fire, the protection function will fail, resulting in a shorter service life of the fire alarm.

[0004] Based on the above situation, the present invention proposes a fire alarm device with good alarm effect and protective function. Summary of the invention

[0005] In order to overcome the disadvantages that the existing fire alarm is damaged quickly due to high temperature, resulting in a short alarm time of the fire alarm and poor overall alarm effect, and the fire alarm with self-cooling protection function mainly relies on external power drive. Once the power supply line is disconnected due to the influence of fire, the protection function will fail, thereby resulting in a short service life of the fire alarm, the present invention provides a fire alarm device with good alarm effect and protection function.

[0006] A fire alarm device with a protective function comprises an installation shell, an induction alarm, a storage box, a pull rope, a wax sealing block, a magnetic block, a spray gun, a blocking block, a push plate and a force-storage spring piece. The installation shell is fixedly connected to the induction alarm, the installation shell is fixedly connected to the storage box, the storage box is slidably connected to the push plate, a pair of force-storage spring pieces are fixedly connected between the push plate and the storage box, the installation shell is fixedly connected to the pull rope, the push plate is also fixedly connected to the pull rope, the other ends of the paired pull ropes are fixedly connected to magnetic blocks, the paired magnetic blocks are magnetically attracted to each other, a wax sealing block is fixedly connected between the paired magnetic blocks, the storage box is fixedly connected to the spray gun, the push plate is fixedly connected to the blocking block, the blocking block is slidably connected to the storage box, and the blocking block is slidably connected to the spray gun.

[0007] As a preferred technical solution of the present invention, it also includes a cooling mechanism, which is arranged on the installation shell, and the cooling mechanism includes a covering plate frame, a top block, a stopper, a first guide frame, a movable frame, a reset spring piece, a connecting rope, an isolation plate, a baffle and a magnetic suction block. The covering plate frame is fixedly connected to the installation shell, the covering plate frame is fixedly connected to the induction alarm, the push plate is fixedly connected to the top block, the installation shell is fixedly connected to the first guide frame, the first guide frame is slidably connected to the stopper, the stopper is in contact and cooperate with the top block, the covering plate frame is slidably connected to the movable frame, a reset spring piece is fixedly connected between the movable frame and the covering plate frame, the covering plate frame is fixedly connected to the isolation plate, the isolation plate is slidably connected to the baffle, the isolation plate is slidably connected to the connecting rope, one end of the connecting rope is fixedly connected to the movable frame, and the other end of the connecting rope is fixedly connected to the baffle, the covering plate frame is fixedly connected to the magnetic suction block, and the magnetic suction block and the baffle are magnetically matched.

[0008] As a preferred technical solution of the present invention, the stopper is provided with an inclined surface.

[0009] As a preferred technical solution of the present invention, both the isolation plate and the baffle are provided with longitudinally distributed strip grooves.

[0010] As a preferred technical solution of the present invention, it also includes a limiting mechanism, which is arranged on the installation shell, and the limiting mechanism includes a pin, a rotating rod, a limiting block and a limiting frame. The pairs of rotating rods are rotatably connected to the installation shell, the rotating rods are rotatably connected to the storage box, the rotating rods are fixedly connected to the limiting blocks, the push plates are fixedly connected to the pairs of limiting frames, the limiting frames are extruded and fitted with the limiting blocks, the rotating rods are slidably connected to the pins, and the pins are slidably connected to the installation shell.

[0011] As a preferred technical solution of the present invention, the limiting block is semi-cylindrical.

[0012] As a preferred technical solution of the present invention, it also includes a locking mechanism, which is arranged on the covering plate frame. The locking mechanism includes a locking frame, a turntable and a second guide frame. The second guide frame is fixed to the covering plate frame, the second guide frame is slidably connected to the locking frame, the locking frame is slidably connected to the moving frame, and a rotating rod on one side is fixedly connected to the turntable, and the turntable is slidably connected to the locking frame.

[0013] As a preferred technical solution of the present invention, the turntable is elliptical.

[0014] As a preferred technical solution of the present invention, it also includes a warning mechanism, which is arranged on the installation shell. The warning mechanism includes a compressed gas tank, a rocker arm and an opener and closer. The compressed gas tank is fixed to the installation shell, the compressed gas tank is rotatably connected to the opener and closer, and the rocker arm is rotatably connected between the opener and closer and the movable frame.

[0015] The beneficial effects of the present invention are: 1. The present invention can automatically generate carbon dioxide gas through chemical reactions through components such as push plates and spray guns when a fire occurs, and fill the surrounding of the installation shell with carbon dioxide gas, thereby preventing the fire from spreading to the induction alarm and causing damage to it, thereby ensuring the alarm effect of the induction alarm, extending the service life of the fire alarm, and improving the practicability of the fire alarm.

[0016] 2. The present invention uses components such as mobile frames and baffles to automatically absorb external heat through physical changes when a fire occurs, and cool down components such as the sensor alarm, thereby preventing the sensor alarm from being damaged by the high temperature of the fire, thereby ensuring the alarm effect of the sensor alarm, extending the service life of the fire alarm, and improving the practicability of the fire alarm.

[0017] 3. The present invention uses components such as limit blocks and limit frames to limit components such as push plates before the device is installed, thereby preventing components such as push plates from moving accidentally and causing chemical reactions to occur prematurely, thereby improving the stability and safety of the fire alarm.

[0018] 4. The present invention uses components such as a bracket and a turntable to position components such as a mobile rack before the device is installed, thereby preventing the mobile rack and other components from moving accidentally and causing physical changes to occur prematurely, thereby improving the stability and safety of the fire alarm.

[0019] 5. The present invention uses components such as a compressed gas tank and an opener and closeer to spray colored smoke when a fire occurs, and uses the colored smoke to provide a visual fire warning to the surrounding people, thereby improving the warning effect of the fire alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 This is a three-dimensional structural diagram of the components such as the housing, the induction alarm and the storage box installed in the present invention.

[0022] Figure 3 This is a three-dimensional structural schematic diagram of the installation of the housing and the induction alarm of the present invention.

[0023] Figure 4 It is a three-dimensional structural schematic diagram of the pull rope, wax seal block, magnetic block and other components of the present invention.

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the components such as the spray barrel, the blocking block and the push plate of the present invention.

[0025] Figure 6 It is a three-dimensional structural schematic diagram of components such as a covering plate frame, a top block and a stop block according to the present invention.

[0026] Figure 7 It is a three-dimensional structural schematic diagram of components such as the movable frame, the resetting spring piece and the connecting rope of the present invention.

[0027] Figure 8 It is a three-dimensional structural schematic diagram of the connecting rope, isolation plate, baffle and other components of the present invention.

[0028] Fig. 9 It is a schematic diagram of the three-dimensional structure of the isolation plate, baffle plate, magnetic suction block and other components of the present invention.

[0029] Fig.10 It is a schematic diagram of the exploded three-dimensional structure of the isolation plate and the baffle of the present invention.

[0030] Fig.11 It is a three-dimensional structural schematic diagram of components such as the bayonet, the rotating rod and the limit block of the present invention.

[0031] Fig.12 It is a three-dimensional structural schematic diagram of the components such as the rotating rod, the limiting block and the limiting frame of the present invention.

[0032] Fig.13 It is a schematic diagram of the three-dimensional structure of the components such as the card frame, the turntable and the second guide frame of the present invention.

[0033] Fig.14 The three-dimensional structure diagram of the present invention is to install the housing, the swing rod and the opener and closeer and other components.

[0034] Fig.15 It is a three-dimensional structural schematic diagram of the compressed gas tank, the swing arm, the opener and the like components of the present invention.

[0035] Marked in the figure: 1: installation shell, 11: induction alarm, 12: storage box, 13: pull rope, 14: wax seal block, 15: magnetic block, 16: spray gun, 17: blocking block, 18: push plate, 19: storage spring piece, 2: covering plate frame, 21: top block, 22: stopper, 23: first guide frame, 24: moving frame, 25: reset spring piece, 26: connecting rope, 27: isolation plate, 28: baffle, 29: magnetic suction block, 3: bayonet, 31: rotating rod, 32: limit block, 33: limit frame, 4: bracket, 41: turntable, 42: second guide frame, 5: compressed gas tank, 51: rocker arm, 52: opener and closer. DETAILED DESCRIPTION

[0036] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0037] Example 1 A fire alarm device with protective functions, such as Figure 1-Figure 5 As shown, it includes an installation shell 1, an induction alarm 11, a storage box 12, a pull rope 13, a wax seal block 14, a magnetic block 15, a spray gun 16, a blocking block 17, a push plate 18 and a force storage spring 19. The rear side of the installation shell 1 is fixedly connected to the induction alarm 11, the front side of the installation shell 1 is fixedly connected to the storage box 12, the left side of the storage box 12 is slidably connected to the push plate 18, and the front and rear two force storage springs are fixedly connected between the push plate 18 and the storage box 12. Piece 19, a pull rope 13 is fixedly connected to the left side of the installation shell 1, and a pull rope 13 is also fixedly connected to the left side of the push plate 18, the other ends of the two pull ropes 13 are fixedly connected to magnetic blocks 15, the two magnetic blocks 15 are magnetically attracted to each other, a wax sealing block 14 is fixedly connected between the two magnetic blocks 15, a spray gun 16 is fixedly connected to the right side of the storage box 12, and a blocking block 17 is fixedly connected to the right side of the push plate 18, the blocking block 17 is slidably connected to the storage box 12, and the blocking block 17 is slidably connected to the spray gun 16.

[0038] When workers want to install the fire alarm device, they can first rotate the installation shell 1 and other components 180° and make the bottom of the installation shell 1 fit with the ceiling of the building, and then they can fix the installation shell 1 and other components to the ceiling with bolts. For ease of understanding, the subsequent principle explanations are based on the directions in the figure. When the device is installed and encounters a fire, the temperature of the surrounding environment will continue to rise. When the sensor alarm 11 senses that the temperature has risen to about 60℃-70℃, it will sound a fire alarm. In addition, the rising temperature will cause the wax seal 14 to gradually melt. When the wax seal 14 is completely melted, since the elastic force of the force storage spring piece 19 is greater than the magnetic force between the two magnetic blocks 15, the push plate 18 and the blocking block 17 will move to the right under the action of the force storage spring piece 19 and separate the two magnetic blocks 15 through the pull rope 13. The blocking block 17 moves to the right and no longer blocks the left and right chambers of the storage box 12. The connecting hole between the storage box 12 and the push plate 18 moves to the right, and the dilute hydrochloric acid in the left chamber of the storage box 12 enters the spray gun 16 through the connecting hole and sprays out from the multiple small holes on the spray gun 16, thereby gradually reacting chemically with the limestone in the right chamber of the storage box 12 to produce carbon dioxide gas, and the produced carbon dioxide gas will be discharged outward from the exhaust hole at the lower right side of the storage box 12, so that carbon dioxide gas can be automatically produced by chemical reaction when a fire occurs, and the carbon dioxide gas is filled around the installation shell 1, so as to prevent the fire from spreading to the induction alarm 11 and causing damage to it, so as to ensure the alarm effect of the induction alarm 11. After the fire is extinguished, the workers can first take out the product in the storage box 12 and restore the push plate 18, the magnetic block 15 and other components to their original state, and then add new reactants to the storage box 12 for subsequent use, so as to extend the service life of the fire alarm.

[0039] Example 2 On the basis of Example 1, Figure 6-Figure 10As shown, a cooling mechanism is also included, which is arranged on the installation shell 1. The cooling mechanism includes a covering plate frame 2, a top block 21, a stopper 22, a first guide frame 23, a moving frame 24, a reset spring 25, a connecting rope 26, an isolation plate 27, a stopper 28 and a magnetic suction block 29. The covering plate frame 2 is fixedly connected to the rear side of the installation shell 1, the covering plate frame 2 is fixedly connected to the induction alarm 11, the top block 21 is fixedly connected to the left side of the push plate 18, the first guide frame 23 is fixedly connected to the left inner wall of the installation shell 1, and the stopper 22 is slidably connected to the right side of the first guide frame 23. The stopper 22 is in contact with the top block 21, and the left front part of the covering plate frame 2 is slidably connected with a movable frame 24, and a reset spring piece 25 is fixedly connected between the movable frame 24 and the covering plate frame 2. An isolation plate 27 is fixedly connected to the lower side of the inside of the covering plate frame 2, and a baffle 28 is slidably connected to the bottom of the isolation plate 27. A connecting rope 26 is slidably connected to the left front part of the isolation plate 27, and one end of the connecting rope 26 is fixedly connected to the movable frame 24, and the other end of the connecting rope 26 is fixedly connected to the baffle 28. A magnetic suction block 29 is fixedly connected to the left side of the inside of the covering plate frame 2, and the magnetic suction block 29 is magnetically matched with the baffle 28.

[0040] like Figure 6 and Figure 7 As shown, the rear side of the stopper 22 is provided with an inclined surface.

[0041] like Figure 8-Figure 10 As shown, the middle of the isolation plate 27 and the baffle plate 28 are provided with strip grooves distributed longitudinally in the front and rear directions.

[0042] When the push plate 18 moves to the right under the action of the force storage spring piece 19, the top block 21 will also move to the right with the push plate 18 and separate from the stopper 22. At this time, since the stopper 22 is no longer blocked by the top block 21 and the elastic force of the reset spring piece 25 is greater than the magnetic force between the baffle plate 28 and the magnetic suction block 29, the movable frame 24 will move upward under the action of the reset spring piece 25 and squeeze the stopper 22 to move forward. The upward movement of the movable frame 24 will also drive the baffle plate 28 to move forward and separate from the magnetic suction block 29 through the connecting rope 26, and the forward movement of the baffle plate 28 will align the strip groove on the baffle plate 28 with the strip groove on the isolation plate 27. At this time, the water in the lower chamber of the covering plate frame 2 will pass through the strip groove. shaped groove enters the upper chamber and gradually undergoes physical changes with the saltpeter in the upper chamber. When saltpeter undergoes physical changes with water and dissolves in water, it absorbs a large amount of heat through the dissolution process. In this way, it can automatically absorb external heat through physical changes when a fire occurs, and cool down components such as the sensing alarm 11, thereby avoiding damage to the sensing alarm 11 due to the high temperature of the fire, so as to ensure the alarm effect of the sensing alarm 11. After the fire is extinguished, the workers can first take out the products in the covering plate frame 2 and restore the baffle 28 and the movable frame 24 and other components to their original positions, and then add new reactants to the covering plate frame 2 for subsequent use, thereby extending the service life of the fire alarm.

[0043] like Fig.11 and Fig.12 As shown, it also includes a limiting mechanism, which is arranged on the installation shell 1. The limiting mechanism includes a latch 3, a rotating rod 31, a limiting block 32 and a limiting frame 33. The two rotating rods 31 are rotatably connected to the upper and lower sides of the installation shell 1 respectively. The rotating rod 31 is rotatably connected to the storage box 12. The middle part of the rotating rod 31 is fixedly connected to the limiting block 32. The upper and lower parts of the left side of the push plate 18 are fixedly connected to the limiting frame 33. The limiting frame 33 is squeezed and matched with the adjacent limiting block 32. The front side of the rotating rod 31 is slidably connected with the latch 3, and the latch 3 is slidably connected to the installation shell 1.

[0044] like Fig.11 and Fig.12 As shown, the limiting block 32 is semi-cylindrical.

[0045] When the installation shell 1 and other components have not been installed on the ceiling, the pin 3 will prevent the rotating rod 31 and the limit block 32 from rotating, and the limit block 32 will prevent the limit frame 33 and the push plate 18 from moving to the right, so that the push plate 18 and other components can be limited before the device is installed, thereby preventing the push plate 18 and other components from moving accidentally and causing the chemical reaction to occur prematurely. After the device is installed, the worker can remove the pin 3 from the installation shell 1 and the rotating rod 31. At this time, if the push plate 18 moves to the right under the action of the force storage spring piece 19, it will drive the limit frame 33 to move to the right together. The limit block 32 and the rotating rod 31 will rotate 90° under the squeezing of the limit frame 33 and will no longer hinder the movement of the push plate 18 and other components.

[0046] like Figure 2 and Fig.13 As shown, it also includes a locking mechanism, which is arranged on the covering plate frame 2. The locking mechanism includes a locking frame 4, a turntable 41 and a second guide frame 42. The second guide frame 42 is fixed to the lower front part of the covering plate frame 2. The locking frame 4 is slidably connected inside the second guide frame 42. The locking frame 4 is slidably connected to the movable frame 24. The rear end of the lower rotating rod 31 is fixedly connected to the turntable 41, and the turntable 41 is slidably connected to the locking frame 4.

[0047] like Fig.13 As shown, the turntable 41 is elliptical.

[0048] When the installation shell 1 and other components have not been installed on the ceiling, the rotating rod 31 will not rotate due to the restriction of the pin 3, and the bracket 4 will be inserted into the movable frame 24 and prevent it from moving upward, so that the movable frame 24 and other components can be positioned before the device is installed, thereby avoiding the movable frame 24 and other components from moving accidentally and causing physical changes to occur prematurely. After the device is installed and the worker removes the pin 3, if the push plate 18 moves to the right under the action of the force storage spring 19, the push plate 18 will drive the limit block 32 and the rotating rod 31 to rotate 90° through the limit frame 33, and the turntable 41 will rotate 90° together with the rotating rod 31 and drive the bracket 4 to move to the right until it is separated from the movable frame 24. At this time, the bracket 4 will no longer hinder the movement of the movable frame 24 and other components.

[0049] like Fig.14 and Fig.15 As shown, a warning mechanism is also included, which is arranged on the mounting shell 1. The warning mechanism includes a compressed gas tank 5, a rocker arm 51 and an opener and closer 52. The compressed gas tank 5 is fixed to the left front side of the mounting shell 1, and the rear side of the compressed gas tank 5 is rotatably connected to the opener and closer 52. The rocker arm 51 is rotatably connected between the opener and closer 52 and the movable frame 24.

[0050] When the movable frame 24 moves upward under the action of the reset spring piece 25, the movable frame 24 will drive the opener 52 to rotate clockwise and open through the rocker rod 51. At this time, the colored smoke in the compressed gas cylinder 5 will be ejected outward through the opener 52. In this way, colored smoke can be ejected when a fire occurs, and the colored smoke can be used to provide a visual fire warning to the surrounding people, thereby improving the warning effect of the fire alarm. After the fire is extinguished, the compressed gas cylinder 5 and other components can be replaced.

[0051] The above embodiments are provided for persons familiar with the art to implement or use the present invention. Personnel familiar with the art can make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the protection scope of the present invention is not limited to the above embodiments, but should be the maximum scope of the innovative features mentioned in the claims.

Claims

1. A fire alarm device with a protective function, characterized in that: The invention comprises a mounting shell (1), an induction alarm (11), a storage box (12), a pull rope (13), a wax seal block (14), a magnetic block (15), a spray gun (16), a blocking block (17), a push plate (18) and a force storage spring piece (19), wherein the mounting shell (1) is fixedly connected to the induction alarm (11), the mounting shell (1) is fixedly connected to the storage box (12), the storage box (12) is slidably connected to the push plate (18), and a pair of force storage spring pieces (19) are fixedly connected between the push plate (18) and the storage box (12). 9), the installation housing (1) is fixedly connected to a pull rope (13), the push plate (18) is also fixedly connected to the pull rope (13), the other ends of the paired pull ropes (13) are fixedly connected to magnetic blocks (15), the paired magnetic blocks (15) are magnetically attracted to each other, a wax sealing block (14) is fixedly connected between the paired magnetic blocks (15), the storage box (12) is fixedly connected to a spray barrel (16), the push plate (18) is fixedly connected to a blocking block (17), the blocking block (17) is slidably connected to the storage box (12), and the blocking block (17) is slidably connected to the spray barrel (16).

2. A fire alarm device with a protective function as claimed in claim 1, characterized in that: The invention also includes a cooling mechanism, which is arranged on the mounting shell (1), and includes a covering plate frame (2), a top block (21), a stop block (22), a first guide frame (23), a moving frame (24), a reset spring (25), a connecting rope (26), an isolation plate (27), a stop plate (28) and a magnetic suction block (29). The covering plate frame (2) is fixedly connected to the mounting shell (1), the covering plate frame (2) is fixedly connected to the induction alarm (11), the push plate (18) is fixedly connected to the top block (21), the mounting shell (1) is fixedly connected to the first guide frame (23), and the first guide frame (23) is slidably connected to the stop block (22). ), the stopper (22) is in contact with the top block (21), the covering plate frame (2) is slidably connected to the moving frame (24), a reset spring (25) is fixedly connected between the moving frame (24) and the covering plate frame (2), the covering plate frame (2) is fixedly connected to an isolation plate (27), the isolation plate (27) is slidably connected to a baffle (28), the isolation plate (27) is slidably connected to a connecting rope (26), one end of the connecting rope (26) is fixedly connected to the moving frame (24), and the other end of the connecting rope (26) is fixedly connected to the baffle (28), the covering plate frame (2) is fixedly connected to a magnetic suction block (29), and the magnetic suction block (29) and the baffle (28) are magnetically matched.

3. A fire alarm device with a protective function as claimed in claim 2, characterized in that: The stopper (22) is provided with an inclined surface.

4. A fire alarm device with a protective function as claimed in claim 3, characterized in that: The isolation plate (27) and the baffle plate (28) are both provided with longitudinally distributed strip grooves.

5. A fire alarm device with a protective function as claimed in claim 4, characterized in that: The invention also comprises a limiting mechanism, which is arranged on the installation shell (1), and comprises a bayonet (3), a rotating rod (31), a limiting block (32) and a limiting frame (33). The pair of rotating rods (31) are both rotatably connected to the installation shell (1), the rotating rods (31) are rotatably connected to the storage box (12), the rotating rods (31) are fixedly connected to the limiting block (32), the push plate (18) is fixedly connected to the pair of limiting frames (33), the limiting frame (33) and the limiting block (32) are pressed and matched, the rotating rod (31) is slidably connected to the bayonet (3), and the bayonet (3) is slidably connected to the installation shell (1).

6. A fire alarm device with a protective function as claimed in claim 5, characterized in that: The limiting block (32) is semi-cylindrical.

7. A fire alarm device with a protective function as claimed in claim 6, characterized in that: The invention also comprises a positioning mechanism, which is arranged on the cover plate frame (2), and comprises a positioning frame (4), a rotating disk (41) and a second guide frame (42), wherein the second guide frame (42) is fixedly connected to the cover plate frame (2), the second guide frame (42) is slidably connected to the positioning frame (4), the positioning frame (4) is slidably connected to the movable frame (24), a rotating rod (31) on one side is fixedly connected to the rotating disk (41), and the rotating disk (41) is slidably connected to the positioning frame (4).

8. A fire alarm device with a protective function as claimed in claim 7, characterized in that: Wherein the rotating disk (41) is oval.

9. A fire alarm device with a protective function as claimed in claim 8, characterized in that: The device also includes a warning mechanism, which is arranged on the mounting housing (1). The warning mechanism includes a compressed gas tank (5), a swing rod (51) and an opener (52). The compressed gas tank (5) is fixed to the mounting housing (1), the compressed gas tank (5) is rotatably connected to the opener (52), and the swing rod (51) is rotatably connected between the opener (52) and the movable frame (24).

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