CN111367137A - Projector fixing device based on special-shaped gear transmission principle - Google Patents
Projector fixing device based on special-shaped gear transmission principle Download PDFInfo
- Publication number
- CN111367137A CN111367137A CN202010374233.3A CN202010374233A CN111367137A CN 111367137 A CN111367137 A CN 111367137A CN 202010374233 A CN202010374233 A CN 202010374233A CN 111367137 A CN111367137 A CN 111367137A
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- Prior art keywords
- gear
- fixedly connected
- outside
- base
- projector
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 14
- 239000000428 dust Substances 0.000 claims abstract description 35
- 230000007704 transition Effects 0.000 claims abstract description 34
- 206010066054 Dysmorphism Diseases 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 20
- 230000017525 heat dissipation Effects 0.000 abstract description 17
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 230000033228 biological regulation Effects 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 3
- 241000883990 Flabellum Species 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
- F16M11/10—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting around a horizontal axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/18—Heads with mechanism for moving the apparatus relatively to the stand
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Projection Apparatus (AREA)
Abstract
The invention relates to the technical field of computer output equipment, and discloses a projector fixing device based on a special-shaped gear transmission principle, which comprises a base, wherein a motor is fixedly connected inside the base, a rotating shaft is fixedly connected outside the motor, fan blades are fixedly connected outside the rotating shaft, a filter screen is movably connected outside the fan blades, a main gear is fixedly connected outside the rotating shaft, a transition gear is connected outside the main gear in a meshed manner, a sector gear is fixedly connected outside the transition gear, a toothed bar is connected outside the sector gear in a meshed manner, a supporting spring is fixedly connected outside the toothed bar, and the rotating shaft, the fan blades, the main gear, the transition gear, the sector gear, the toothed bar and a brush bar are matched for use, so that external auxiliary wind power heat dissipation is achieved, the heat dissipation effect is improved, and dust at a heat dissipation port of a projector is effectively removed, the dust is prevented from blocking the heat dissipation port, and the heat dissipation effect of the projector is further ensured.
Description
Technical Field
The invention relates to the technical field of computer output equipment, in particular to a projector fixing device based on a special-shaped gear transmission principle.
Background
The output device is a terminal device of a computer hardware system, and is used for receiving output display, printing, sound of computer data, controlling peripheral device operation and the like, and also expressing various calculation result data or information in the form of numbers, characters, images, sound and the like.
The projector can generate heat in the using process, if the heat can not be dissipated in time, the temperature of the projector is too high, the influence on internal components of the projector can be generated, the service life is shortened, the projector can be directly damaged if the heat is serious, the maintenance cost is increased, the heat generated by an optical imaging system inside the projector and the heat generated by a power supply part can be dissipated by the conventional method of installing a fan group in the projector, when the projector works, the heat dissipation fan also operates, the heat can be dissipated, however, the good heat dissipation effect of the projector can not be achieved by the inner heat dissipation fan, the projector is often exposed in the air, dust floating in the air often blocks the vent of the projector, the effect of the heat dissipation fan is reduced for a long time, and the heat dissipation effect is reduced.
In order to solve the above problems, the inventors provide a projector fixing device based on the principle of the transmission of the special-shaped gear.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: a projector fixing device based on a special-shaped gear transmission principle comprises a base, a motor, a rotating shaft, fan blades, a filter screen, a main gear, a transition gear, a sector gear, a toothed bar, a supporting spring, a connecting block, a brush rod, a movable plate, an adjusting rod, a threaded block, a threaded rod, a dust exhaust channel and a dust collection box.
The positions and the connection relations of the structures are as follows:
the inside of the base is fixedly connected with a motor, the outside of the motor is fixedly connected with a rotating shaft, the outside of the rotating shaft is fixedly connected with fan blades, the outside of the fan blades is movably connected with a filter screen, the outside of the rotating shaft is fixedly connected with a main gear, the outer part of the main gear is engaged and connected with a transition gear, the outer part of the transition gear is fixedly connected with a sector gear, the outer part of the sector gear is engaged and connected with a toothed bar, the outer part of the toothed bar is fixedly connected with a supporting spring, the outer part of the toothed bar is movably connected with a connecting block, the outer part of the connecting block is fixedly connected with a brush bar, the outside of the brush rod is movably connected with a movable plate, the bottom of the movable plate is hinged with an adjusting rod, the bottom of the adjusting rod is hinged with a thread block, the inner thread of the thread block is connected with a threaded rod, the dust exhaust device is characterized in that a dust exhaust channel is formed in the base, and a dust collection box is movably connected to the outer portion of the dust exhaust channel.
Preferably, the filter screen is movably connected to the outer part of the rotating shaft, and the filter screen is fixedly connected with the base.
Preferably, the number of the transition gears and the number of the sector gears are two, the two transition gears are fixedly connected with the two sector gears, the two transition gears are respectively meshed with the two sides of the main gear, and the two transition gears and the sector gears are movably connected inside the base.
Preferably, the toothed bar is connected to the inside of the base in a sliding manner, teeth are arranged on two sides of the toothed bar, and the teeth on two sides of the toothed bar are respectively connected with the two sector gears in a meshing manner.
Preferably, the number of the supporting springs is two, the two supporting springs are respectively and fixedly connected to two ends of the rack rod, and one ends, far away from the rack rod, of the two supporting springs are fixedly connected with the base.
Preferably, the brush-holder stud is "L" shape, and brush-holder stud sliding connection is in the outside of projecting apparatus, brush-holder stud and ventilation hole swing joint, and brush-holder stud sliding connection is in the inside of fly leaf.
Preferably, the threaded rod is movably connected to the inside of the base.
Advantageous effects
Compared with the prior art, the invention provides a projector fixing device based on the special-shaped gear transmission principle, which has the following beneficial effects:
1. this projecting apparatus fixing device based on dysmorphism gear drive principle uses through the cooperation of pivot, flabellum, master gear, transition gear, sector gear, ratch and brush-holder stud to reach the heat dissipation of external supplementary wind-force, increase radiating effect, and effectively get rid of the dust of projecting apparatus thermovent, avoid the dust to block up the thermovent, further guarantee the radiating effect of projecting apparatus.
2. This projecting apparatus fixing device based on dysmorphism gear drive principle uses through the cooperation of adjusting pole, thread piece and threaded rod to reach the effect of adjusting the projecting apparatus angle, and it is convenient to adjust, and the degree of accuracy is high, takes place the slope when effectively avoiding projecting apparatus angle regulation, thereby increases the device's result of use.
Drawings
FIG. 1 is a schematic view of the overall connection of the structure of the present invention;
FIG. 2 is a schematic view of the connection of the main gear, the transition gear, the sector gear, the rack bar and the support spring of the section A-A of the structure of FIG. 1 according to the present invention;
FIG. 3 is a schematic top view of the structure of the present invention showing the connection of the base, the rotating shaft, the main gear, the transition gear, the sector gear, the rack bar, the brush bar and the movable plate;
fig. 4 is an enlarged view of the connection of the rotating shaft, the main gear, the rack bar, the connecting block and the brush bar in part B of the structure of fig. 1 according to the present invention.
In the figure: 1. a base; 2. a motor; 3. a rotating shaft; 4. a fan blade; 5. filtering with a screen; 6. a main gear; 7. a transition gear; 8. a sector gear; 9. a rack bar; 10. a support spring; 11. connecting blocks; 12. a brush bar; 13. a movable plate; 14. adjusting a rod; 15. a thread block; 16. a threaded rod; 17. a dust exhaust channel; 18. a dust collecting box.
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.
Referring to fig. 1-4, a projector fixing device based on the principle of transmission of a special-shaped gear comprises a base 1, a motor 2, a rotating shaft 3, fan blades 4, a filter screen 5, a main gear 6, a transition gear 7, a sector gear 8, a rack bar 9, a support spring 10, a connecting block 11, a brush bar 12, a movable plate 13, an adjusting rod 14, a threaded block 15, a threaded rod 16, a dust exhaust channel 17, and a dust collection box 18.
The positions and the connection relations of the structures are as follows:
the motor 2 is fixedly connected inside the base 1, the rotating shaft 3 is fixedly connected outside the motor 2, the fan blade 4 is fixedly connected outside the rotating shaft 3, the filter screen 5 is movably connected outside the fan blade 4, the filter screen 5 is movably connected outside the rotating shaft 3, the filter screen 5 is fixedly connected with the base 1, the main gear 6 is fixedly connected outside the rotating shaft 3, the transition gear 7 is meshed with the outer part of the main gear 6, the sector gear 8 is fixedly connected outside the transition gear 7, the two transition gears 7 and the sector gear 8 are respectively provided with two numbers, the two transition gears 7 are fixedly connected with the two sector gears 8, the two transition gears 7 are respectively meshed with the two sides of the main gear 6, the two transition gears 7 and the sector gear 8 are movably connected inside the base 1, the toothed bar 9 is meshed with the outer part of the sector gear 8, and the toothed bar 9 is connected inside the base 1, the both sides of ratch 9 all are provided with tooth, and the tooth of ratch 9 both sides is connected with 8 meshing of two sector gear respectively, and the outside of ratch 9 has linked firmly supporting spring 10, and supporting spring 10 is provided with two, and two supporting spring 10 are fixed connection respectively at the both ends of ratch 9, and the one end that ratch 9 was kept away from to two supporting spring 10 all with base 1 fixed connection.
The external part of the rack bar 9 is movably connected with a connecting block 11, the external part of the connecting block 11 is fixedly connected with a brush rod 12, the external auxiliary wind power heat dissipation is achieved through the matching use of the rotating shaft 3, the fan blades 4, the main gear 6, the transition gear 7, the sector gear 8, the rack bar 9 and the brush rod 12, the heat dissipation effect is enhanced, the dust at the heat dissipation port of the projector is effectively removed, the dust is prevented from blocking the heat dissipation port, and the heat dissipation effect of the projector is further ensured, the brush rod 12 is L-shaped, the brush rod 12 is slidably connected with the external part of the projector, the brush rod 12 is movably connected with the ventilation hole, the brush rod 12 is slidably connected with the internal part of the movable plate 13, the external part of the brush rod 12 is movably connected with the movable plate 13, the bottom of the movable plate 13 is hinged with an adjusting rod 14, the bottom of the adjusting rod 14 is hinged with a thread, the adjustment rod 14, the thread block 15 and the threaded rod 16 are matched for use, so that the effect of adjusting the angle of the projector is achieved, the adjustment is convenient, the adjustment accuracy is high, the inclination of the projector during angle adjustment is effectively avoided, the using effect of the device is increased, the dust exhaust channel 17 is formed in the base 1, and the dust exhaust channel 17 is movably connected with the dust collection box 18.
In the use process, because the motor 2 is fixedly connected with the rotating shaft 3, the rotating shaft 3 is fixedly connected with the fan blades 4, and the fan blades 4 are movably connected with the filter screen 5, the motor 2 drives the rotating shaft 3 to rotate, the rotating shaft 3 drives the fan blades 4 to rotate, so that the fan blades 4 blow air, the filter screen 5 filters air, dust is prevented from polluting a projector, meanwhile, the fan blades 4 enable air to flow outside the projector, the heat dissipation effect of the projector is increased by matching with an internal fan set of the projector, the use effect of the projector is ensured, and the service life of the projector is prolonged. And because the rotating shaft 3 is fixedly connected with the main gear 6, two transition gears 7 and two sector gears 8 are arranged, two transition gears 7 are fixedly connected with two sector gears 8, the two transition gears 7 are respectively meshed with two sides of the main gear 6, the two transition gears 7 and the sector gears 8 are movably connected with the inside of the base 1, the rack bar 9 is slidably connected with the inside of the base 1, two sides of the rack bar 9 are respectively provided with teeth, the teeth on two sides of the rack bar 9 are respectively meshed with the two sector gears 8, the rack bar 9 is movably connected with the connecting block 11, the connecting block 11 is fixedly connected with the brush bar 12, the brush bar 12 is in an L shape, the brush bar 12 is slidably connected with the outside of the projector, the brush bar 12 is movably connected with the ventilation hole, the brush bar 12 is slidably connected with the inside of the movable plate 13, the rotating shaft 3 drives the main gear 6 to rotate, the main gear 6 drives the two transition gears, two transition gears 7 drive two sector gears 8 and rotate, two sector gears 8 are connected with the meshing of ratch 9 each other, two sector gears 8 drive ratch 9 up-and-down reciprocating motion, then ratch 9 drives brush-holder stud 12 up-and-down reciprocating motion through connecting block 11, thereby make brush-holder stud 12 brush the projecting apparatus up-and-down reciprocating, reach the effect of getting rid of the projecting apparatus thermovent dust, and under the effect of the inside fan assembly of projecting apparatus, make the dust fall to the outside of projecting apparatus, and because dust exhaust way 17 has been seted up to base 1's inside, dust exhaust way 17 and dust collection box 18 swing joint, so the dust falls into dust exhaust way 17, and under the effect of outside flabellum 4, the dust passes through dust exhaust way 17 and gets into dust collection box 18, reach the effect of collecting the dust.
Because projecting apparatus fixed connection is in the outside of fly leaf 13, fly leaf 13 and base 1 articulate the connection, fly leaf 13 and regulation pole 14 articulate the connection, regulation pole 14 and screw thread piece 15 articulate the connection, screw thread piece 15 and threaded rod 16 threaded connection, threaded rod 16 swing joint is in the inside of base 1, so through rotating threaded rod 16, threaded rod 16 drives screw thread piece 15 and removes, screw thread piece 15 drives regulation pole 14, adjust pole 14 jack-up fly leaf 13, thereby make fly leaf 13 slope certain angle, then fly leaf 13 drives projecting apparatus slope certain angle, thereby reach the effect of adjusting the projecting apparatus slope, and easy operation, effectively increase the result of use of the device.
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 (7)
1. The utility model provides a projecting apparatus fixing device based on dysmorphism gear drive principle, includes base (1), its characterized in that: the novel fan-shaped fan is characterized in that a motor (2) is fixedly connected to the inside of the base (1), a rotating shaft (3) is fixedly connected to the outside of the motor (2), fan blades (4) are fixedly connected to the outside of the rotating shaft (3), a filter screen (5) is movably connected to the outside of the fan blades (4), a main gear (6) is fixedly connected to the outside of the rotating shaft (3), a transition gear (7) is connected to the outside of the main gear (6) in a meshed manner, a sector gear (8) is fixedly connected to the outside of the transition gear (7), a toothed bar (9) is connected to the outside of the sector gear (8) in a meshed manner, a supporting spring (10) is fixedly connected to the outside of the toothed bar (9), a connecting block (11) is movably connected to the outside of the toothed bar (9), a brush bar (12) is fixedly connected to the outside of the connecting, the bottom of the movable plate (13) is hinged to an adjusting rod (14), the bottom of the adjusting rod (14) is hinged to a threaded block (15), the inner thread of the threaded block (15) is connected with a threaded rod (16), a dust exhaust channel (17) is formed in the base (1), and a dust collection box (18) is movably connected to the outer portion of the dust exhaust channel (17).
2. The projector fixing device based on the special-shaped gear transmission principle as claimed in claim 1, wherein: the filter screen (5) is movably connected to the outer portion of the rotating shaft (3), and the filter screen (5) is fixedly connected with the base (1).
3. The projector fixing device based on the special-shaped gear transmission principle as claimed in claim 1, wherein: transition gear (7) and sector gear (8) all are provided with two, two transition gear (7) and two sector gear (8) fixed connection, and two transition gear (7) mesh respectively and connect in the both sides of master gear (6), and two transition gear (7) and sector gear (8) all swing joint are in the inside of base (1).
4. The projector fixing device based on the special-shaped gear transmission principle as claimed in claim 1, wherein: the gear rack (9) is connected inside the base (1) in a sliding mode, teeth are arranged on two sides of the gear rack (9), and the teeth on two sides of the gear rack (9) are respectively connected with the two sector gears (8) in a meshed mode.
5. The projector fixing device based on the special-shaped gear transmission principle as claimed in claim 1, wherein: the two supporting springs (10) are respectively fixedly connected to two ends of the rack rod (9), and one ends, far away from the rack rod (9), of the two supporting springs (10) are fixedly connected with the base (1).
6. The projector fixing device based on the special-shaped gear transmission principle as claimed in claim 1, wherein: the brush rod (12) is L-shaped, the brush rod (12) is connected to the outer portion of the projector in a sliding mode, the brush rod (12) is movably connected with the vent hole, and the brush rod (12) is connected to the inner portion of the movable plate (13) in a sliding mode.
7. The projector fixing device based on the special-shaped gear transmission principle as claimed in claim 1, wherein: the threaded rod (16) is movably connected inside the base (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010374233.3A CN111367137B (en) | 2020-05-06 | 2020-05-06 | Projector fixing device based on special-shaped gear transmission principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010374233.3A CN111367137B (en) | 2020-05-06 | 2020-05-06 | Projector fixing device based on special-shaped gear transmission principle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111367137A true CN111367137A (en) | 2020-07-03 |
| CN111367137B CN111367137B (en) | 2021-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010374233.3A Active CN111367137B (en) | 2020-05-06 | 2020-05-06 | Projector fixing device based on special-shaped gear transmission principle |
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| CN (1) | CN111367137B (en) |
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| US20110298994A1 (en) * | 2010-06-08 | 2011-12-08 | Sanyo Electric Co., Ltd. | Air filter cleaner and video projector |
| CN105900011A (en) * | 2014-09-02 | 2016-08-24 | Cjcgv株式会社 | Movable table for projector |
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| CN208135928U (en) * | 2017-12-28 | 2018-11-23 | 厦门市绿得清新材料科技有限公司 | A kind of device handling oily wastewater |
| CN208571364U (en) * | 2018-07-19 | 2019-03-01 | 深圳市华通电气设备有限公司 | A kind of cell switch case radiator |
| CN208766851U (en) * | 2018-06-01 | 2019-04-19 | 黄冈职业技术学院 | A kind of think of political affairs training projection arrangement |
| CN208922043U (en) * | 2018-10-10 | 2019-05-31 | 南京邮电大学 | A kind of projector dust-extraction unit |
| CN208954368U (en) * | 2018-07-19 | 2019-06-07 | 贵阳市博爻科技有限公司 | A kind of multimedia teaching projection arrangement |
| CN110327711A (en) * | 2019-06-06 | 2019-10-15 | 安徽工程大学 | A kind of multimedia teaching synchronized dust removal dehumidifying projection screen |
| CN210090892U (en) * | 2019-07-29 | 2020-02-18 | 深圳市昱为科技有限公司 | Dustproof projector |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2607219A1 (en) * | 1986-05-27 | 1988-05-27 | Barret Henri Paul | Modular support making it possible to adjust a slide projector in three directions |
| US20110298994A1 (en) * | 2010-06-08 | 2011-12-08 | Sanyo Electric Co., Ltd. | Air filter cleaner and video projector |
| CN105900011A (en) * | 2014-09-02 | 2016-08-24 | Cjcgv株式会社 | Movable table for projector |
| CN206850291U (en) * | 2017-06-07 | 2018-01-05 | 常涛 | A kind of distribution box for being easy to ventilation and heat |
| CN107528236A (en) * | 2017-10-16 | 2017-12-29 | 成都创年科技有限公司 | A kind of electric power cabinet being easy to internal cleaning |
| CN208017215U (en) * | 2017-12-27 | 2018-10-30 | 牛春立 | A kind of Mechanical Design Teaching model support |
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| CN108760812A (en) * | 2018-06-01 | 2018-11-06 | 苏州市东成办公科技有限公司 | A kind of projecting apparatus Air Filter blockage detector |
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| CN110327711A (en) * | 2019-06-06 | 2019-10-15 | 安徽工程大学 | A kind of multimedia teaching synchronized dust removal dehumidifying projection screen |
| CN210090892U (en) * | 2019-07-29 | 2020-02-18 | 深圳市昱为科技有限公司 | Dustproof projector |
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| Publication number | Publication date |
|---|---|
| CN111367137B (en) | 2021-06-11 |
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