CN113485062A

CN113485062A - Projection equipment capable of powering off when starting from flip cover and fan stop

Info

Publication number: CN113485062A
Application number: CN202110762067.9A
Authority: CN
Inventors: 胡满菱
Original assignee: Xiamen Quanrong Trading Co ltd
Current assignee: Xiamen Quanrong Trading Co ltd
Priority date: 2021-07-06
Filing date: 2021-07-06
Publication date: 2021-10-08

Abstract

The invention relates to the technical field of image projection, and discloses a projection device capable of powering off a self-turning cover and a fan when the projection device is started and the fan stops. According to the projection equipment with the power failure function when the automatic turnover cover and the fan are started and stopped, when the equipment is started, the electromagnet is communicated to attract the magnetic ring to enable the cam to rotate outwards, the rack frame drives the semicircular cover plate to be away from the projection lens under the transmission of the first connecting rod and the half gear, the effect of automatically stretching and covering the lens is achieved, when the fan blade completely stops rotating, based on the transmission of the bevel gear set, the first rotating shaft stops rotating to enable the centrifugal rod not to be subjected to the centrifugal force, the abutting block returns to the original position to enable the contact to be disconnected and communicated, and the waiting time is shortened.

Description

Projection equipment capable of powering off when starting from flip cover and fan stop

Technical Field

The invention relates to the technical field of image projection, in particular to a projection device which is powered off when a self-turning cover and a fan stop when the projection device is started.

Background

The projector is a device capable of projecting images or videos onto a curtain, and can be connected with a computer through different interfaces, VCD, DVD, a game machine, DV and the like to play corresponding video signals, and is widely applied to families, offices, schools and entertainment places.

The invention provides a projection device which is powered off when a self-turning cover and a fan stop when the projection device is started, wherein the self-turning cover and the fan stop when the projection device is started, an electromagnet is communicated to attract a magnetic ring to enable a cam to rotate outwards, a rack frame drives a semicircular cover plate to be away from a projection lens under the transmission of a connecting rod I and a half gear, the effect of automatically stretching and covering the lens when the projection device is started and closed is achieved, when the rotation of the fan completely stops, on the basis of the transmission of a bevel gear set, a rotating shaft stops rotating to enable a centrifugal rod not to be subjected to the action of centrifugal force, a resisting block restores to the original position to enable contacts to be disconnected and connected, the effect of triggering the power failure when the cooling fan stops rotating is achieved, and the waiting time is reduced.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides the projection equipment which is powered off when the self-turning cover and the fan stop when the projection equipment is started, has the advantages of self-stretching covering lens when the projection equipment is started and closed and triggering power off when the cooling fan stops rotating, and solves the problems that the lens needs to be opened and closed before and after the projection equipment is used and the projection equipment can be closed only when the cooling fan stops rotating.

(II) technical scheme

In order to achieve the purpose of triggering power failure when the self-telescopic covering lens and the cooling fan stop rotating when the self-telescopic covering lens and the cooling fan are started and closed, the invention provides the following technical scheme: the utility model provides a from projection equipment of outage when flip and fan stop when starting, includes the casing, the top left and right sides of casing rotates and is connected with moving mechanism, moving mechanism is close the one end fixedly connected with telescopic machanism at casing center, the left end fixedly connected with outage subassembly of casing bottom, the top center fixedly connected with projecting lens of casing, the thermovent has been seted up to the bottom of casing, both ends fixedly connected with electro-magnet about the casing top.

Preferably, the moving mechanism comprises a cam, a magnetic ring, a first connecting rod, a first half gear, a rack and a first spring, the magnetic ring is fixedly connected inside the cam, the first connecting rod is hinged to the top of the cam, the other end of the first connecting rod is hinged to the half gear, the rack is connected to the upper side of the half gear in a meshed mode, and the first spring is elastically connected to one side, close to the half gear, of the rack.

Preferably, the cam is about casing central symmetry arrangement, the cam rotates and connects the top at the casing, there is the pinion at the top of cam through a connecting rod transmission connection, the pinion rotates the top of connecting at the casing, rack spacing connection is at the top inner wall of casing, the one end elastic connection of the rack is kept away from to the spring makes the pinion rotate at the inner wall of casing through a cam normal running fit connecting rod transmission, based on the meshing of rack, moves the position of rack about.

Preferably, the telescopic mechanism comprises a semicircular cover plate, a roller, a second spring, a movable plate and a magnetic block, the bottom of the end, far away from the center of the shell, of the semicircular cover plate is rotatably connected with the roller, the movable plate is elastically connected to the inner wall of the semicircular cover plate through the second spring, and the magnetic block is fixedly connected to the inner portion of the movable plate.

Preferably, the semicircular cover plate is fixedly connected to one end, close to the center of the shell, of the rack, the combined size of the semicircular cover plate is larger than that of the projection lens, a movable plate is connected to the inner portion of the semicircular cover plate in a limiting mode, the magnetic poles of the corresponding faces of the magnetic blocks are opposite in direction, the magnetic force between the magnetic blocks enables the movable plates to be close to cover the projection lens, and meanwhile the movable plates are kept away from each other through two elastic forces of the spring when the semicircular cover plate is kept away from each other.

Preferably, the power-off assembly comprises a motor, a bevel gear set, a first rotating shaft, a fan blade, a disc, a centrifugal rod, a supporting block and a contact, the first rotating shaft is connected to an output shaft of the motor through transmission of the bevel gear set, the fan blade is fixedly connected to the left end of the output shaft of the motor, the disc is fixedly connected to the top end of the first rotating shaft, the centrifugal rod is elastically connected to the periphery of the disc, the supporting block is abutted to the right side of the centrifugal rod, and the contact is elastically connected to the right end of the supporting block.

Preferably, motor and electro-magnet and equipment power electric connection, a pivot rotates the bottom of connecting at the casing, the inside cavity of casing, the thermovent distributes in the bottom of casing and the left end of casing, contact and equipment power electric connection, after the flabellum completely stalls, the inside centrifugal lever of disc no longer receives the centrifugal force effect, and under elastic action power, the centrifugal lever resumes the normal position, and based on the butt that supports the piece, the contact no longer the butt intercommunication, the disconnection equipment power.

(III) advantageous effects

Compared with the prior art, the invention provides the projection equipment which is powered off when the automatic cover turning and the fan stop when the automatic cover turning and the fan start, and the projection equipment has the following beneficial effects:

1. this projection equipment from outage when flip and fan stop during start-up, the left and right sides through the casing top rotates and is connected with the cam, when equipment starts, the electro-magnet intercommunication attracts the magnetic ring, the cam outwards rotates, under the transmission of connecting rod one, the synchronous rotation of semi-gear, meshing based on the rack, both ends remove about the semicircle apron is to the casing, along with semicircle apron distance becomes far away, under two elastic action of spring, the fly leaf removes to rack one end, make projection lens show prominently, otherwise when equipment closes, the cam receives the action of gravity to resume the normal position, under connecting rod one and a spring elastic action, the semicircle apron removes in opposite directions and covers projection lens, thereby reach the effect that covers the camera lens from flexible when starting to close, improve equipment's practicality.

2. This projection equipment of outage when starting from flip and fan stop, through the left side fixed connection motor of casing bottom, when the flabellum rotates the complete stop, under the transmission of awl tooth group, a stall, centrifugal rod no longer receives the centrifugal force effect, under the spring force effect, centrifugal rod and support piece resume the normal position, and the contact disconnection communicates the shutoff equipment power this moment to reach the effect that triggers the outage when radiator fan stall, reduce and wait for consuming time.

Drawings

FIG. 1 is a close-up view of the structure of the present invention;

FIG. 2 is a schematic diagram of the start-up of the structure of the present invention;

FIG. 3 is an enlarged view of the moving mechanism of FIG. 1 according to the present invention;

FIG. 4 is an enlarged view of the structure of FIG. 1 at A according to the present invention;

FIG. 5 is an enlarged view of the structure of FIG. 2 at B according to the present invention.

In the figure: 1. a housing; 2. a moving mechanism; 21. a cam; 22. a magnetic ring; 23. a first connecting rod; 24. a half gear; 25. a rack frame; 26. a first spring; 3. a telescoping mechanism; 31. a semicircular cover plate; 32. a roller; 33. a second spring; 34. a movable plate; 35. a magnetic block; 4. a power-off component; 41. a motor; 42. a set of bevel teeth; 43. a first rotating shaft; 44. a fan blade; 45. a disc; 46. a centrifugal lever; 47. a resisting block; 48. a contact; 5. a projection lens; 6. a heat dissipation port; 7. an electromagnet.

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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

referring to fig. 1, 2 and 3, a projection device capable of automatically turning a cover and cutting off power when a fan stops when the projection device is started comprises a shell 1, moving mechanisms 2 are rotatably connected to the left side and the right side of the top of the shell 1, each moving mechanism 2 comprises a cam 21, a magnetic ring 22, a first connecting rod 23, a second connecting rod 23, a half gear 24, a rack frame 25 and a first spring 26, the magnetic ring 22 is fixedly connected inside the cam 21, the first connecting rod 23 is hinged to the top of the cam 21, the other end of the first connecting rod 23 is hinged to the half gear 24, the rack frame 25 is connected to the upper side of the half gear 24 in a meshing manner, the first spring 26 is elastically connected to one side of the rack frame 25 close to the half gear 24, the cam 21 is symmetrically arranged around the center of the shell 1, the cam 21 is rotatably connected to the top of the shell 1, the top of the cam 21 is in transmission connection with the half gear 24 through the first connecting rod 23, the half gear 24 is rotatably connected to the top of the shell 1, the rack frame 25 is in a limiting manner connected to the inner wall of the top of the shell 1, one end of a first spring 26, which is far away from a rack 25, is elastically connected to the inner wall of the shell 1, the cam 21 is rotationally matched with a first connecting rod 23 to drive a half gear 24 to rotate, the position of the rack 25 is moved leftwards and rightwards based on the meshing of the rack 25, one end, which is close to the center of the shell 1, of the moving mechanism 2 is fixedly connected with a telescopic mechanism 3, the telescopic mechanism 3 comprises a semicircular cover plate 31, a roller 32, a second spring 33, a movable plate 34 and a magnetic block 35, the bottom of one end, which is far away from the center of the shell 1, of the semicircular cover plate 31 is rotatably connected with the roller 32, the inner wall of the semicircular cover plate 31 is elastically connected with the movable plate 34 through the second spring 33, the magnetic block 35 is fixedly connected inside the movable plate 34, the semicircular cover plate 31 is fixedly connected to one end, which is close to the center of the shell 1, the combined size of the semicircular cover plate 31 is larger than the size of the projection lens 5, the movable plate 34 is in the limiting connection inside of the semicircular cover plate 31, and the magnetic blocks 35 have opposite magnetic poles on the corresponding surfaces, along with semicircle apron 31 is close to each other, magnetic force between magnetic path 35 makes fly leaf 34 draw close to each other and cover projection lens 5, spring two 33 elasticity makes fly leaf 34 keep away from each other when semicircle apron 31 keeps away from each other simultaneously, the left end fixedly connected with outage subassembly 4 of casing 1 bottom, the top center fixedly connected with projection lens 5 of casing 1, thermovent 6 has been seted up to the bottom of casing 1, both ends fixedly connected with electro-magnet 7 about casing 1 top, when equipment starts, receive magnetic ring 22 to drive the rotation through cam 21, cooperation connecting rod one 23 and the transmission of semi-gear 24, it is flexible to make rack 25 drive semicircle apron 31 remove, need open or cover the camera lens around avoiding projection equipment to use, the practicality of equipment has been improved.

Example two:

referring to fig. 1, 4 and 5, a projection apparatus capable of powering off a flip cover and a fan when the apparatus is stopped when the apparatus is started, includes a housing 1, moving mechanisms 2 are rotatably connected to left and right sides of a top of the housing 1, an extending mechanism 3 is fixedly connected to one end of the moving mechanism 2 close to a center of the housing 1, a power-off assembly 4 is fixedly connected to a left end of a bottom of the housing 1, the power-off assembly 4 includes a motor 41, a bevel gear set 42, a first rotating shaft 43, a fan blade 44, a disc 45, a centrifugal rod 46, a resisting block 47, and a contact 48, an output shaft of the motor 41 is connected to the first rotating shaft 43 through the bevel gear set 42, the fan blade 44 is fixedly connected to a left end of the output shaft of the motor 41, the disc 45 is fixedly connected to a top end of the first rotating shaft 43, the periphery of the disc 45 is elastically connected to the centrifugal rod 46, the right side of the centrifugal rod 46 is abutted to the resisting block 47, the right end of the resisting block 47 is elastically connected to the contact 48, the motor 41 and the electromagnet 7 are electrically connected to an apparatus power supply, a pivot 43 rotates and connects the bottom at casing 1, casing 1's inside cavity, thermovent 6 distributes in casing 1's bottom and casing 1's left end, contact 48 and equipment power electric connection, after flabellum 44 completely stalls, the inside centrifugal rod 46 of disc 45 no longer receives the centrifugal force effect, under elastic force, centrifugal rod 46 restores to the original position, based on the butt of resisting piece 47, contact 48 no longer the butt intercommunication, the disconnection equipment power, casing 1's top center fixedly connected with projection lens 5, thermovent 6 has been seted up to casing 1's bottom, both ends fixedly connected with electro-magnet 7 about casing 1 top, after casing 1 inside radiator fan stall, based on the automatic disconnection equipment power of elastic force, avoid waiting, the practicality of equipment has been improved, it takes time to have reduced and waited for.

Example three:

referring to fig. 1-5, a projection device capable of powering off a flip cover and a fan when the projection device is started and the fan stops comprises a housing 1, wherein moving mechanisms 2 are rotatably connected to the left and right sides of the top of the housing 1, each moving mechanism 2 comprises a cam 21, a magnetic ring 22, a first connecting rod 23, a half gear 24, a rack frame 25 and a first spring 26, the magnetic ring 22 is fixedly connected inside the cam 21, the first connecting rod 23 is hinged to the top of the cam 21, the other end of the first connecting rod 23 is hinged to the half gear 24, a rack frame 25 is connected to the upper side of the half gear 24 in a meshing manner, the first spring 26 is elastically connected to one side of the rack frame 25 close to the half gear 24, the cam 21 is symmetrically arranged around the center of the housing 1, the cam 21 is rotatably connected to the top of the housing 1, the top of the cam 21 is in transmission connection with the half gear 24 through the first connecting rod 23, the half gear 24 is rotatably connected to the top of the housing 1, the rack frame 25 is in limit connection with the inner wall of the top of the housing 1, one end of a first spring 26, which is far away from a rack 25, is elastically connected to the inner wall of the shell 1, the cam 21 is rotationally matched with a first connecting rod 23 to drive a half gear 24 to rotate, the position of the rack 25 is moved leftwards and rightwards based on the meshing of the rack 25, one end, which is close to the center of the shell 1, of the moving mechanism 2 is fixedly connected with a telescopic mechanism 3, the telescopic mechanism 3 comprises a semicircular cover plate 31, a roller 32, a second spring 33, a movable plate 34 and a magnetic block 35, the bottom of one end, which is far away from the center of the shell 1, of the semicircular cover plate 31 is rotatably connected with the roller 32, the inner wall of the semicircular cover plate 31 is elastically connected with the movable plate 34 through the second spring 33, the magnetic block 35 is fixedly connected inside the movable plate 34, the semicircular cover plate 31 is fixedly connected to one end, which is close to the center of the shell 1, the combined size of the semicircular cover plate 31 is larger than the size of the projection lens 5, the movable plate 34 is in the limiting connection inside of the semicircular cover plate 31, and the magnetic blocks 35 have opposite magnetic poles on the corresponding surfaces, along with the approaching of the semicircular cover plates 31, the movable plates 34 are closed to cover the projection lens 5 under the action of magnetic force between the magnetic blocks 35, and the movable plates 34 are away from each other under the action of the magnetic force of the second springs 33 when the semicircular cover plates 31 are away from each other, the left end of the bottom of the housing 1 is fixedly connected with the power-off assembly 4, the power-off assembly 4 comprises a motor 41, a conical tooth group 42, a first rotating shaft 43, a fan blade 44, a disc 45, a centrifugal rod 46, a resisting block 47 and a contact 48, an output shaft of the motor 41 is connected with the first rotating shaft 43 in a transmission manner through the conical tooth group 42, the left end of the output shaft of the motor 41 is fixedly connected with the fan blade 44, the top end of the first rotating shaft 43 is fixedly connected with the disc 45, the periphery of the disc 45 is elastically connected with the centrifugal rod 46, the right side of the centrifugal rod 46 is contacted with the resisting block 47, the right end of the resisting block 47 is elastically connected with the contact 48, the motor 41 and the electromagnet 7 are electrically connected with the power supply of the equipment, the first rotating shaft 43 is rotatably connected with the bottom of the housing 1, the interior of the shell 1 is hollow, the heat dissipation ports 6 are distributed at the bottom of the shell 1 and the left end of the shell 1, the contact 48 is electrically connected with the power supply of the equipment, after the fan blades 44 are completely stopped, the centrifugal bars 46 inside the disc 45 are no longer subjected to centrifugal force, under the elastic acting force, the centrifugal rod 46 restores to the original position, the contact 48 is not connected in a butting way based on the butting of the butting block 47, the power supply of the equipment is cut off, the projection lens 5 is fixedly connected at the center of the top of the shell 1, the heat dissipation port 6 is arranged at the bottom of the shell 1, the left end and the right end of the top of the shell 1 are fixedly connected with the electromagnet 7, the electromagnet 7 is communicated with the excitation magnetic field to control the angle of the magnetic ring 22, the relative distance between the rack 25 and the semicircular cover plate 31 is changed under the transmission of the semi-gear 24, so as to achieve the effect of automatically covering the lens, meanwhile, when the fan blades 44 stop rotating, the power is automatically triggered to be cut off, so that the time consumed by waiting is reduced, and the practicability of the equipment is improved.

The working process and principle are as follows: the left side and the right side of the top of the shell 1 are rotatably connected with cams 21, the top of the cam 21 is in transmission connection with a half gear 24 through a first connecting rod 23, when the equipment is started, the electromagnet 7 is communicated with the attraction magnetic ring 22, the cam 21 rotates outwards, the half gear 24 rotates synchronously under the transmission of the first connecting rod 23, as the upper side of the half gear 24 is in meshing connection with the rack frame 25, one end of the rack frame 25, which is far away from the half gear 24, is fixedly connected with a half round cover plate 31, based on the meshing of the rack frame 56, the half round cover plate 31 moves towards the left end and the right end of the shell 1, along with the distance of the half round cover plate 31, under the elastic action of a second spring 33, the movable plate 34 moves towards one end of the rack frame 25, so that the projection lens 5 is highlighted, otherwise, when the equipment is closed, the cam 21 returns to the original position under the action of gravity, under the elastic action of the first connecting rod 23 and the first spring 26, the half round cover plate 31 moves towards each other to cover the projection lens 5, and in the approaching process, the magnetic force between the magnetic blocks 35 makes the movable plate 34 move oppositely to cover the projection lens 5, so as to achieve the effect of self-extending and self-retracting to cover the lens when starting and closing, and improve the practicability of the device, based on the motor 41 fixedly connected to the left side of the bottom of the shell 1, when the fan blades 44 rotate, because the output shaft of the motor 41 is in transmission connection with the first rotating shaft 43 through the bevel gear group 42, the first rotating shaft 43 drives the disc 45 to rotate synchronously, under the action of centrifugal force, when the centrifugal rod 46 is abutted against the resisting block 47 rightwards, the contact 48 is communicated, the projection lens 5 works normally, when the fan blade 44 stops rotating completely, under the drive of the bevel gear group 42, the first rotating shaft 43 stops rotating, the centrifugal rod 46 is not subjected to centrifugal force, under the action of the elastic force of the spring, the centrifugal rod 46 and the abutting block 47 return to the original positions, and at the moment, the contact 48 is disconnected from the power supply of the closed equipment, so that the effect of triggering power failure when the cooling fan stops rotating is achieved, and the waiting time is reduced.

In summary, in the projection apparatus powered off when the self-flipping cover and the fan stop at the time of starting, the cam 21 is rotatably connected to the left side and the right side of the top of the housing 1, when the apparatus starts, the electromagnet 7 is communicated with the attraction magnetic ring 22, the cam 21 rotates outwards, the half gear 24 rotates synchronously under the transmission of the first connecting rod 23, based on the meshing of the rack 56, the semicircular cover plate 31 moves towards the left end and the right end of the housing 1, as the distance of the semicircular cover plate 31 becomes farther, the movable plate 34 moves towards one end of the rack 25 under the elastic force of the second spring 33, so that the projection lens 5 is highlighted, otherwise, when the apparatus is closed, the cam 21 returns to the original position under the gravity, and the semicircular cover plate 31 moves towards each other under the elastic force of the first connecting rod 23 and the first spring 26, so that the effect of self-stretching and covering the projection lens at the time of starting and closing is achieved, and the practicability of the apparatus is improved.

In addition, in the projection equipment which is powered off when the self-turning cover and the fan stop when the projection equipment is started, the motor 41 is fixedly connected to the left side of the bottom of the shell 1, when the fan blade 44 completely stops rotating, the first rotating shaft 43 stops rotating under the transmission of the bevel gear group 42, the centrifugal rod 46 is not subjected to the centrifugal force, the centrifugal rod 46 and the abutting block 47 recover to the original position under the elastic force of the spring, and at the moment, the contact 48 is disconnected to connect and shut off the power supply of the equipment, so that the effect of triggering the power-off when the heat-dissipating fan stops rotating is achieved, and the waiting time is reduced.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a from projecting apparatus of power failure when flip and fan stop when starting, includes casing (1), its characterized in that: the utility model discloses a projection camera, including casing (1), the top left and right sides of casing (1) rotates and is connected with moving mechanism (2), moving mechanism (2) are close one end fixedly connected with telescopic machanism (3) at casing (1) center, the left end fixedly connected with outage subassembly (4) of casing (1) bottom, the top center fixedly connected with projection lens (5) of casing (1), thermovent (6) have been seted up to the bottom of casing (1), both ends fixedly connected with electro-magnet (7) about casing (1) top.

2. A projection device according to claim 1 which is powered down when the flip cover and fan are stopped, wherein: the moving mechanism (2) comprises a cam (21), a magnetic ring (22), a first connecting rod (23), a first half gear (24), a rack frame (25) and a first spring (26), the magnetic ring (22) is fixedly connected inside the cam (21), the first connecting rod (23) is hinged to the top of the cam (21), the first half gear (24) is hinged to the other end of the first connecting rod (23), the rack frame (25) is connected to the upper side of the first half gear (24) in a meshed mode, and the first spring (26) is elastically connected to one side, close to the first half gear (24), of the rack frame (25).

3. A projection device according to claim 1 or 2, wherein said power is cut off when said cover and said fan are stopped, and wherein: cam (21) are arranged about casing (1) central symmetry, cam (21) rotate and connect the top at casing (1), the top of cam (21) is connected with semi-gear (24) through connecting rod (23) transmission, semi-gear (24) rotate and connect the top at casing (1), rack (25) spacing connection is at the top inner wall of casing (1), the one end elastic connection of rack (25) is kept away from in spring (26) is at the inner wall of casing (1).

4. A projection device according to claim 1 which is powered down when the flip cover and fan are stopped, wherein: telescopic machanism (3) are including semicircle apron (31), roller (32), two (33) springs, fly leaf (34), magnetic path (35), semicircle apron (31) are kept away from casing (1) center one end bottom and are rotated and are connected with roller (32), the inner wall of semicircle apron (31) has fly leaf (34) through two (33) elastic connection springs, the inside fixedly connected with magnetic path (35) of fly leaf (34).

5. A projection device according to claim 1, 2 or 4, wherein said power is cut off when said cover and said fan are stopped, and wherein: semicircle apron (31) fixed connection is in the one end that rack (25) is close casing (1) center, the combined dimension of semicircle apron (31) is greater than the size of projection lens (5), the inside limit connection of semicircle apron (31) has fly leaf (34), magnetic path (35) are opposite to the magnetic pole direction of corresponding face.

6. A projection device according to claim 1 which is powered down when the flip cover and fan are stopped, wherein: outage subassembly (4) include motor (41), awl tooth group (42), pivot (43), flabellum (44), disc (45), centrifugal rod (46), support piece (47), contact (48), the output shaft of motor (41) is connected with pivot (43) through awl tooth group (42) transmission, the left end fixedly connected with flabellum (44) of motor (41) output shaft, the top fixedly connected with disc (45) of pivot (43), the peripheral elastic connection of disc (45) has centrifugal rod (46), the right side of centrifugal rod (46) is supported and has been connect and is supported piece (47), the right-hand member elastic connection who supports piece (47) has contact (48).

7. A projection device according to claim 1 or 6, wherein said power is cut off when said cover and said fan are stopped, and wherein: motor (41) and electro-magnet (7) and equipment power electric connection, pivot (43) rotate to be connected in the bottom of casing (1), the inside cavity of casing (1), thermovent (6) distribute in the bottom of casing (1) and the left end of casing (1), contact (48) and equipment power electric connection.