CN115410332A

CN115410332A - Fire alarm

Info

Publication number: CN115410332A
Application number: CN202211365147.1A
Authority: CN
Inventors: 练迪; 韩治林
Original assignee: Gyro Artificial Intelligence Shandong Co ltd
Current assignee: Gyro Artificial Intelligence Shandong Co ltd
Priority date: 2022-11-03
Filing date: 2022-11-03
Publication date: 2022-11-29
Anticipated expiration: 2042-11-03
Also published as: CN115410332B

Abstract

The invention relates to the technical field of fire alarm, in particular to a fire alarm, which comprises a fixed sleeve, wherein the outer surface of the upper end of the fixed sleeve is fixedly connected with a ceiling, the upper end of the inner surface of the fixed sleeve is fixedly connected with a motor, the inner side of the fixed sleeve is provided with a monitoring mechanism, the monitoring mechanism comprises a rotating shaft fixedly connected with a motor driving shaft, the lower end of the outer surface of the rotating shaft is fixedly connected with a monitoring box, the outer side of the monitoring box is provided with a cleaning mechanism, the cleaning mechanism comprises a sleeve fixedly connected with the outer surface of the rotating shaft, and the lower end of the sleeve is provided with a wiping mechanism. According to the invention, the monitoring box, the sleeve, the brush roll, the smoke sensor and other components are arranged, and in the process of monitoring the ambient air in real time through the smoke sensor, dust adsorbed on the surfaces of the sleeve and the monitoring box is cleaned through the brush roll, so that the dust accumulation is prevented from influencing the circulation of the air, and the accuracy of the fire alarm is effectively improved.

Description

Fire alarm

Technical Field

The invention relates to the technical field of fire alarm, in particular to a fire alarm.

Background

The fire alarm is monitoring equipment commonly used in factory buildings, residential buildings and office buildings so as to avoid the problem of personal and property safety caused by fire, smoke at the beginning of fire can be accumulated under an indoor ceiling, the smoke detector can monitor and detect the existence of the smoke in real time, and the environment is periodically monitored every 45s or so; the alarm monitors through inside intelligent processor response discrete light source, small soot and aerial fog, in case monitor smog and send the chimes of doom, makes people learn the condition of a fire as early as possible, puts out the conflagration at the bud state, but there is following shortcoming in current fire alarm's structure: dust, dust and smog particles around the alarm can enter the sensing area from the opening on the shell, and the sensing of the device is insensitive after long-time use, so that the detection effect is influenced;

the existing fire alarm device is used, due to the accumulation of dust in the air, the air inlet of the fire alarm device is easily blocked, the monitoring sensitivity of the fire alarm device is reduced, the problems that the fire alarm is not timely and the like are caused, therefore, the dust adsorbed on the surface of the air inlet is required to be cleaned in the process of carrying out fire monitoring on the fire alarm device, meanwhile, the dust blocks the air inlet to influence the smoke to enter the inside of the fire alarm device, the single smoke sensor is used for carrying out fire monitoring, the false alarm is easily caused when the dust is excessively adsorbed, and people are easily alarmed.

Therefore, a fire alarm is provided.

Disclosure of Invention

The present invention is directed to a fire alarm device to solve the above problems.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a fire alarm, includes fixed cover, fixed cover upper end surface and ceiling fixed connection, fixed cover internal surface upper end fixedly connected with motor, fixed cover inboard is provided with monitoring mechanism, monitoring mechanism include with motor drive shaft fixed connection's rotation axis, rotation axis surface lower extreme fixedly connected with monitoring box, the monitoring box outside is provided with clearance mechanism, clearance mechanism includes the sleeve with rotation axis surface fixed connection, the sleeve lower extreme is provided with cleans the mechanism, clean the mechanism include with sleeve lower extreme surface fixed connection's casing, the casing lower extreme is provided with alarm mechanism.

Preferably, the sieve mesh has been seted up to monitoring case surface, monitoring incasement fixed surface is connected with smoke transducer, monitoring case is located the inboard just lower extreme surface of sleeve and rotates the laminating with the sleeve, the air inlet bars have evenly been seted up to the sleeve surface, the rotation axis lower extreme runs through and monitors case, sleeve about both ends and extend to the casing inboard, sleeve surface symmetry fixedly connected with connecting block, sleeve one end and fixed cover fixed connection are kept away from to the connecting block.

Preferably, the clearance mechanism still include with rotation axis surface upside fixed connection's connecting rod, the spout has been seted up on the connecting rod surface, the spout internal rotation is connected with even axle one, even axle two, even axle one is located even two right sides of axle, even axle lower extreme fixedly connected with gear three, even two lower extreme fixedly connected with gears two of axle, the rotation axis surface is located connecting rod downside fixedly connected with gear one.

Preferably, the first gear is meshed with a third gear, the third gear is meshed with a second gear, the lower end of the second connecting shaft penetrates through the upper end and the lower end of the second gear and extends to the inner side of the sleeve, a brush roller is fixedly connected to the lower side of the outer surface of the connecting shaft, and the outer surface of the brush roller is respectively in rotating fit with the inner surface of the sleeve and the outer surface of the monitoring box.

Preferably, alarm mechanism includes and rotates the logical axle of being connected with the housing surface, the embedded speaker that installs of fixed cover surface, the speaker is cyclic annular distribution, casing lower extreme surface rotates and is connected with the rack, the rack is the loop configuration, lead to the axle and run through about the gear four both ends and with four fixed connection of gear, the meshing of rack upper end has gear four, the rack lower extreme is fixedly connected with temperature sensor, light sensor respectively, temperature sensor is located the light sensor left side, temperature sensor constitutes the hemisphere with light sensor.

Preferably, the upper end of the inner surface of the fixed sleeve is positioned on two sides of the motor and is fixedly connected with a control module and a storage battery respectively, the storage battery is positioned on the right side of the control module, and an electric interface is embedded in the outer surface of the upper end of the fixed sleeve.

Preferably, the inside of the shell is of a hollow structure, the rotating shaft is rotatably connected with the outer surface of the upper end of the shell, the wiping mechanism further comprises a rotating wheel fixedly connected with the lower end of the rotating shaft, the lower end of the rotating wheel is meshed with a cam, and a through shaft is fixedly connected to the inner side of the cam.

Preferably, lead to the axle about both ends to the casing outside and rotate with the casing and be connected, lead to a fixed surface and be connected with the bandage, bandage one end is around rolling up at the external surface of logical axle other end and casing internal surface fixed connection, the bandage is made for the elastic steel band.

Preferably, both ends fixedly connected with scraper blade about leading to the off-axial surface, the scraper blade is located the casing outside, the scraper blade is the semicircle ring-type, scraper blade upper end outer fixed surface is connected with clean cotton, clean cotton is the semicircle ring-type, clean cotton rotates the laminating with temperature sensor, light sensor surface, the scraper blade is kept away from clean cotton one end embedded emergency light of installing, emergency light respectively with battery, control module electric connection.

Preferably, the motor, the smoke sensor, the temperature sensor and the light sensor are respectively electrically connected with the storage battery and the control module, and the electrical interface is electrically connected with an external power supply.

Compared with the prior art, the invention has the beneficial effects that:

1. by arranging the monitoring box, the sleeve, the brush roll, the smoke sensor and other components, in the process of monitoring the ambient air in real time through the smoke sensor, the brush roll cleans dust adsorbed on the surfaces of the sleeve and the monitoring box, so that the dust accumulation is prevented from influencing the circulation of the air, and the accuracy of the fire alarm is effectively improved;

2. the alarm component is arranged in the invention, so that the problems that the conventional smoke fire alarm cannot often monitor the occurrence of a fire at the first time when influenced by wind power and the like are solved, and the temperature and the fire light during the occurrence of the fire are monitored by using the temperature sensor and the light sensor, so that the efficiency of fire monitoring and alarming is greatly improved;

3. by arranging the wiping mechanism, the surface of the alarm mechanism is cleaned by driving the cleaning cotton through the scraper in the process of carrying out fire monitoring and alarming, so that the influence of dust on the accuracy of the alarm mechanism is avoided, and the precision of the fire alarm is effectively improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is an overall structural view of the present invention;

FIG. 2 is an elevational view of the overall construction of the present invention;

FIG. 3 is a top view of the overall structure of the present invention;

FIG. 4 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 3 in accordance with the present invention;

FIG. 5 is a structural view of the sleeve and monitoring box of the present invention;

FIG. 6 is a structural view of a first link and gear of the present invention;

FIG. 7 is a structural view of the through shaft and cam of the present invention.

Description of reference numerals:

1. a monitoring mechanism; 10. a motor; 11. a rotating shaft; 12. connecting blocks; 13. a smoke sensor; 14. monitoring the box; 15. screening holes; 16. a sleeve; 17. an air intake grill; 2. a cleaning mechanism; 20. a connecting rod; 21. a first gear; 22. a chute; 23. a brush roll; 24. a first connecting shaft; 25. a second gear; 26. a third gear; 27. a second connecting shaft; 3. a wiping mechanism; 30. a housing; 31. a shaft is connected; 32. a squeegee; 33. cleaning cotton; 34. a cam; 35. a rotating wheel; 36. a bandage; 4. an alarm mechanism; 40. fixing a sleeve; 41. a storage battery; 42. a speaker; 43. a control module; 44. an electrical interface; 45. a temperature sensor; 46. a light sensor; 47. 48, emergency light, gear four; 49. a rack.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Referring to fig. 1 to 7, the present invention provides a technical solution:

the utility model provides a fire alarm, includes fixed cover 40, fixed cover 40 upper end surface and ceiling fixed connection, fixed cover 40 internal surface upper end fixedly connected with motor 10, fixed cover 40 inboard is provided with monitoring mechanism 1, monitoring mechanism 1 includes the rotation axis 11 with motor 10 drive shaft fixed connection, 11 outer surface lower extreme fixedly connected with monitoring box 14 of rotation axis, the 14 outsides of monitoring box are provided with clean mechanism 2, clean mechanism 2 includes the sleeve 16 with 11 outer surface fixed connection of rotation axis, 16 lower extremes of sleeve are provided with cleans mechanism 3, clean mechanism 3 include the casing 30 with 16 lower extremes of sleeve outer surface fixed connection, casing 30 lower extreme is provided with alarm mechanism 4.

Through adopting above-mentioned technical scheme, fire alarm fixes on the ceiling through fixed cover 40, motor 10 electrically conducts the operation and drives rotation axis 11 and rotate, rotation axis 11 drives monitoring box 14 and rotates in step, carry out real-time supervision to the air around the fire alarm through monitoring mechanism 1, when rotation axis 11 is rotatory, clean mechanism 2 cleans monitoring box 14 and sleeve 16, avoid the too much influence monitoring mechanism 1 operation of dust absorption, when the conflagration breaks out, alarm mechanism 4 sends the early warning and reminds crowd around withdraw danger area as early as possible, clean mechanism 3 cleans the dust, thereby improve fire alarm's sensitivity and accuracy.

As an embodiment of the present invention, as shown in fig. 4 and 5, the outer surface of the monitoring box 14 is provided with a sieve hole 15, the inner surface of the monitoring box 14 is fixedly connected with a smoke sensor 13, the monitoring box 14 is located inside the sleeve 16, the outer surface of the lower end of the monitoring box 14 is rotatably attached to the sleeve 16, the outer surface of the sleeve 16 is uniformly provided with an air inlet grid 17, the lower end of the rotating shaft 11 penetrates through the monitoring box 14 and the upper and lower ends of the sleeve 16 and extends to the inside of the housing 30, the outer surface of the sleeve 16 is symmetrically and fixedly connected with a connecting block 12, and one end of the connecting block 12, which is far away from the sleeve 16, is fixedly connected with the fixing sleeve 40.

By adopting the technical scheme, the sleeve 16 is fixed with the fixed sleeve 40 through the connecting block 12, the rotating shaft 11 drives the monitoring box 14 to synchronously rotate and further drives the smoke sensor 13 to rotate, the monitoring box 14 rotates to disturb air in the sleeve 16, circulation of the air is accelerated, the air enters from the air inlet grid 17 of the sleeve 16 and then enters into the monitoring box 14 from the sieve holes 15 on the surface of the monitoring box 14, the smoke sensor 13 monitors the air around the fire alarm in real time, smoke generated by the fire is conveniently and accurately monitored in time by arranging the monitoring mechanism 1, and therefore people around are reminded to evacuate rapidly.

As an embodiment of the present invention, as shown in fig. 5 and 6, the cleaning mechanism 2 further includes a connecting rod 20 fixedly connected to an upper side of an outer surface of the rotating shaft 11, a sliding groove 22 is formed on a surface of the connecting rod 20, a first connecting shaft 24 and a second connecting shaft 27 are rotatably connected to the sliding groove 22, the first connecting shaft 24 is located on a right side of the second connecting shaft 27, a third gear 26 is fixedly connected to a lower end of the first connecting shaft 24, a second gear 25 is fixedly connected to a lower end of the second connecting shaft 27, and a first gear 21 is fixedly connected to an outer surface of the rotating shaft 11 located on a lower side of the connecting rod 20.

The first gear 21 is meshed with a third gear 26, the third gear 26 is meshed with a second gear 25, the lower end of the second connecting shaft 27 penetrates through the upper end and the lower end of the second gear 25 and extends to the inner side of the sleeve 16, a brush roller 23 is fixedly connected to the lower side of the outer surface of the second connecting shaft 27, and the outer surface of the brush roller 23 is respectively in rotating fit with the inner surface of the sleeve 16 and the outer surface of the monitoring box 14.

By adopting the technical scheme, the rotating shaft 11 drives the first gear 21 to synchronously rotate, the third gear 26 drives the second gear 25 to rotate through the synchronous rotation of the first gear 21 in a meshing transmission mode, the third gear 26 and the second gear 25 respectively drive the first connecting shaft 24 and the second connecting shaft 27 to rotate in the sliding groove 22, the rotating shaft 11 drives the connecting rod 20 to synchronously rotate around the rotating shaft 11, the second connecting shaft 27 is further driven to do circular motion through the connecting rod 20, the second connecting shaft 27 drives the brush roll 23 to rotate, the surfaces of the sleeve 16 and the monitoring box 14 are cleaned through the brush roll 23, and the problem that dust blocks the screen holes 15 to cause unsmooth air circulation to influence monitoring quality is avoided.

As an embodiment of the present invention, as shown in fig. 1 and 4, the alarm mechanism 4 includes a through shaft 31 rotatably connected to the surface of the housing 30, a speaker 42 is embedded in the outer surface of the fixing sleeve 40, the speaker 42 is annularly distributed, the outer surface of the lower end of the housing 30 is rotatably connected to a rack 49, the rack 49 is an annular structure, the through shaft 31 penetrates through the left and right ends of a gear wheel four 48 and is fixedly connected to the gear wheel four 48, the gear wheel four 48 is engaged at the upper end of the rack 49, a temperature sensor 45 and a light sensor 46 are respectively fixedly connected to the lower end of the rack 49, the temperature sensor 45 is located at the left side of the light sensor 46, and the temperature sensor 45 and the light sensor 46 form a hemisphere shape.

The upper end of the inner surface of the fixing sleeve 40 is positioned at two sides of the motor 10 and is fixedly connected with a control module 43 and a storage battery 41 respectively, the storage battery 41 is positioned at the right side of the control module 43, and an electric interface 44 is embedded in the outer surface of the upper end of the fixing sleeve 40.

By adopting the technical scheme, the through shaft 31 rotates to drive the gears to synchronously rotate four 48, the rack 49 drives the temperature sensor 45 and the light sensor 46 to rotate through being meshed with the gears four 48, and then the surrounding environment is monitored, when a fire disaster occurs, smoke generated by the fire disaster often cannot be diffused into the fire alarm at the first time due to the influence of external factors such as wind power and the like, at the moment, the single smoke sensor 13 is likely to cause untimely and accurate alarm, so that the fire disaster cannot be found at the first time and corresponding measures are taken, the temperature sensor 45 and the light sensor 46 are arranged, high temperature and fire light can be generated when the fire disaster occurs, the temperature and the fire light are respectively monitored through the temperature sensor 45 and the light sensor 46, the accuracy of fire monitoring alarm is improved, when the fire disaster occurs, the control module 43 controls the loudspeaker 42 to give an alarm, and the fire rescue telephone is automatically dialed through an external central control system to give an alarm.

As an embodiment of the present invention, as shown in fig. 4 and 7, the inside of the housing 30 is hollow, the rotating shaft 11 is rotatably connected to the outer surface of the upper end of the housing 30, the wiping mechanism 3 further includes a runner 35 fixedly connected to the lower end of the rotating shaft 11, the lower end of the runner 35 is engaged with a cam 34, and the inner side of the cam 34 is fixedly connected to the through shaft 31.

Lead to axle 31 about both ends to the casing 30 outside and rotate with casing 30 and be connected, lead to 31 external surface fixed connection of axle and be connected with

bandage

36, 36 one end of bandage is around rolling up and be connected at the other end of leading to 31 external surface of axle and casing 30 internal surface fixed, bandage 36 is made for the elastic steel band.

Lead to both ends fixedly connected with scraper blade 32 about 31 surfaces, scraper blade 32 is located the casing 30 outside, scraper blade 32 is the semicircle ring-type, scraper blade 32 upper end outer fixed surface is connected with clean cotton 33, clean cotton 33 is the semicircle ring-type, clean cotton 33 rotates the laminating with temperature sensor 45, light sensor 46 surface.

Through adopting above-mentioned technical scheme, rotation axis 11 drives the runner 35 rotatory, cam 34 half and runner 35 mesh half and runner 35 break away from the contact, and then drive cam 34 intermittent type through runner 35 and rotate, cam 34 rotates and drives the synchronous intermittent type rotation of logical axle 31, lead to axle 31 and drive scraper blade 32 and rotate and then drive clean cotton 33 through scraper blade 32 and clean temperature sensor 45 and light sensor 46 surface, lead to axle 31 at the rotation in-process, it is tensile to winding up bandage 36 on leading to axle 31 surface, when runner 35 and cam 34 break away from the contact, bandage 36 contracts under self elasticity and drives logical axle 31 and rotate, and then drive scraper blade 32 and accomplish and reset.

As an embodiment of the present invention, as shown in fig. 4, an emergency lamp 47 is installed in an embedded manner at an end of the scraper 32 away from the cleaning cotton 33, the emergency lamp 47 is electrically connected to the storage battery 41 and the control module 43 respectively, the motor 10, the smoke sensor 13, the temperature sensor 45, and the light sensor 46 are electrically connected to the storage battery 41 and the control module 43 respectively, and the electrical interface 44 is electrically connected to an external power supply.

Through adopting above-mentioned technical scheme, can cause the power failure when the conflagration takes place usually, supply power to speaker 42 and emergency light 47 when having a power failure through setting up battery 41, avoid having a power failure to influence fire alarm's normal work, under the condition that does not have the conflagration, supply power to fire alarm through electrical property interface 44, and charge battery 41, thereby prolong battery 41's life, emergency light 47 opens when meetting the conflagration, throw light on around the fire alarm, thereby avoid the crowd lost in the scene of a fire to be convenient for the crowd flee from the scene of a fire fast.

The working principle is as follows: fire alarm fixes on the ceiling through fixed cover 40, the air gets into from the air inlet grid 17 of sleeve 16, then get into inside monitoring box 14 from monitoring box 14 surperficial sieve mesh 15, smoke transducer 13 carries out real-time supervision to the air around the fire alarm, monitoring mechanism 1 moves, clean sleeve 16 and monitoring box 14 surface through brush roll 23, avoid the dust to block up sieve mesh 15 and cause the smooth monitoring quality that influences of circulation of air, monitor temperature and firelight respectively through temperature sensor 45 and light sensor 46, thereby improve the accuracy of fire monitoring warning, drive clean cotton 33 through scraper blade 32 and clean temperature sensor 45 and light sensor 46 surface, improve fire alarm's accuracy, supply power to speaker 42 and emergency light 47 when having a power failure through setting up battery 41, avoid having a power failure to influence the normal work of fire alarm.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fire alarm including a fixed sleeve (40), characterized in that: fixed cover (40) upper end surface and ceiling fixed connection, fixed cover (40) internal surface upper end fixedly connected with motor (10), fixed cover (40) inboard is provided with monitoring mechanism (1), monitoring mechanism (1) includes rotation axis (11) with motor (10) drive shaft fixed connection, rotation axis (11) surface lower extreme fixedly connected with monitoring box (14), monitoring box (14) outside is provided with clean mechanism (2), clean mechanism (2) include sleeve (16) with rotation axis (11) outer fixed surface connection, sleeve (16) lower extreme is provided with cleans mechanism (3), clean mechanism (3) include casing (30) with sleeve (16) lower extreme outer fixed surface connection, casing (30) lower extreme is provided with alarm mechanism (4).

2. A fire alarm according to claim 1 wherein: sieve mesh (15) have been seted up to monitoring case (14) surface, monitoring case (14) internal surface fixedly connected with smoke transducer (13), monitoring case (14) are located sleeve (16) inboard and lower extreme surface and sleeve (16) and rotate the laminating, air inlet grid (17) have evenly been seted up to sleeve (16) surface, rotation axis (11) lower extreme runs through and monitors both ends about case (14), sleeve (16) and extends to casing (30) inboardly, sleeve (16) surface symmetry fixedly connected with connecting block (12), sleeve (16) one end and fixed cover (40) fixed connection are kept away from in connecting block (12).

3. A fire alarm according to claim 2 wherein: clean mechanism (2) still include with rotation axis (11) surface upside fixed connection's connecting rod (20), spout (22) have been seted up on connecting rod (20) surface, spout (22) inboard is rotated and is connected with even axle one (24), even axle two (27), even axle one (24) are located even axle two (27) right side, even axle one (24) lower extreme fixedly connected with gear three (26), even axle two (27) lower extreme fixedly connected with gear two (25), rotation axis (11) surface is located connecting rod (20) downside fixedly connected with gear one (21).

4. A fire alarm according to claim 3 wherein: the gear I (21) is meshed with a gear III (26), the gear III (26) is meshed with a gear II (25), the lower end of the connecting shaft II (27) penetrates through the upper end and the lower end of the gear II (25) and extends to the inner side of the sleeve (16), a brush roller (23) is fixedly connected to the lower side of the outer surface of the connecting shaft II (27), and the outer surface of the brush roller (23) is respectively in rotating fit with the inner surface of the sleeve (16) and the outer surface of the monitoring box (14).

5. A fire alarm according to claim 1 wherein: alarm mechanism (4) include logical axle (31) of being connected with casing (30) surface rotation, fixed cover (40) surface is embedded installs speaker (42), speaker (42) are cyclic annular distribution, casing (30) lower extreme surface rotates and is connected with rack (49), rack (49) are the loop configuration, lead to axle (31) and run through four (48) left and right sides both ends of gear and with four (48) gear fixed connection, rack (49) upper end meshing has four (48) of gear, rack (49) lower extreme difference fixedly connected with temperature sensor (45), light sensor (46), temperature sensor (45) are located light sensor (46) left side, temperature sensor (45) and light sensor (46) whole constitution hemisphere.

6. A fire alarm according to claim 5 wherein: fixed cover (40) internal surface upper end is located motor (10) both sides fixedly connected with control module (43), battery (41) respectively, battery (41) are located control module (43) right side, and the embedded electric property interface (44) of installing of fixed cover (40) upper end surface of telling.

7. A fire alarm according to claim 6 wherein: the inside hollow structure that is of casing (30), rotation axis (11) and casing (30) upper end surface rotate to be connected, clean mechanism (3) still include with rotation axis (11) lower extreme fixed connection's runner (35), the meshing of runner (35) lower extreme has cam (34), cam (34) inboard fixedly connected with leads to axle (31).

8. A fire alarm according to claim 7 wherein: lead to axle (31) about both ends to casing (30) outside and rotate with casing (30) and be connected, lead to axle (31) external fixed surface and be connected with bandage (36), bandage (36) one end is connected with casing (30) internal fixed surface around rolling up at logical axle (31) surface other end, bandage (36) are made for the elastic steel band.

9. A fire alarm according to claim 8 wherein: lead to both ends fixedly connected with scraper blade (32) about axle (31) surface, scraper blade (32) are located the casing (30) outside, scraper blade (32) are the semicircle cyclic annular, scraper blade (32) upper end outer fixed surface is connected with clean cotton (33), clean cotton (33) are the semicircle cyclic annular, clean cotton (33) and temperature sensor (45), light sensor (46) surface rotate the laminating.

10. A fire alarm according to claim 9 wherein: scraper blade (32) are kept away from clean cotton (33) one end embedded installation emergency light (47), emergency light (47) respectively with battery (41), control module (43) electric connection, motor (10), smoke transducer (13), temperature sensor (45), light sensor (46) respectively with battery (41), control module (43) electric connection, electrical property interface (44) and external power source electric connection.