CN111271552B - Dustproof device of air detector placing frame - Google Patents
Dustproof device of air detector placing frame Download PDFInfo
- Publication number
- CN111271552B CN111271552B CN201911370718.9A CN201911370718A CN111271552B CN 111271552 B CN111271552 B CN 111271552B CN 201911370718 A CN201911370718 A CN 201911370718A CN 111271552 B CN111271552 B CN 111271552B
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- fixedly connected
- fixed
- main body
- dustproof
- cavity
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Classifications
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B17/00—Methods preventing fouling
- B08B17/02—Preventing deposition of fouling or of dust
- B08B17/04—Preventing deposition of fouling or of dust by using removable coverings
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- 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
- F16M11/20—Undercarriages with or without wheels
- F16M11/24—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other
- F16M11/26—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other by telescoping, with or without folding
Abstract
The invention belongs to the field of dustproof devices, in particular to a dustproof device of an air detector placing frame, which aims at solving the problems that the existing placing frame is only used for simply placing an air detector, and the air detector is easy to fall a large amount of dust without dustproof measures, so that the use of the air detector is influenced, and the scheme is provided, wherein the dustproof device comprises a placing frame main body, a detector main body, a first dustproof shell and a second dustproof shell, a cavity is arranged on the placing frame main body, a driving motor is fixedly connected on the inner wall of the bottom of the cavity, and a rotating shaft is fixedly connected on an output shaft of the driving motor, the detection range is increased, and the comprehensiveness of detection is improved.
Description
Technical Field
The invention relates to the technical field of dustproof devices, in particular to a dustproof device of an air detector placing frame.
Background
The air detector is independently researched, developed and produced, is used for detecting polluted gas based on the principle of a constant potential electrolytic sensor and detecting dust based on the light scattering principle, is a latest scientific and technological product developed and developed by combining internationally mature electronic technology and network communication technology, meets various technical index requirements of the state on an urban environment air automatic monitoring system, is high in localization degree, has strong practicability and ideal cost performance ratio, can replace similar imported products, is an ideal instrument for developing urban environment air automatic monitoring, and is mostly fixed on a placing rack when detecting air.
However, the existing placing rack is only used for simply placing the air detector, and no dustproof measure is provided, so that a large amount of dust is easily dropped on the air detector, and the use of the air detector is influenced.
Disclosure of Invention
Based on the technical problems that the existing placing frame is only used for placing the air detector and has no dustproof measure, so that a large amount of dust is easy to fall on the air detector and the use of the air detector is influenced, the invention provides the dustproof device of the placing frame of the air detector.
The invention provides a dustproof device of an air detector placing frame, which comprises a placing frame main body, a detector main body, a first dustproof shell and a second dustproof shell, wherein a cavity is arranged on the placing frame main body, a driving motor is fixedly connected on the inner wall of the bottom of the cavity, a rotating shaft is fixedly connected on an output shaft of the driving motor, the top end of the rotating shaft is rotatably connected with the inner wall of the top of the cavity, a movable plate is connected on the rotating shaft through threads, two pulleys are symmetrically arranged on the inner wall of the bottom of the cavity, fixed shafts are rotatably connected on the inner walls of two sides of the cavity respectively, a winding wheel is fixedly sleeved on each fixed shaft, the same pulling rope is wound on each winding wheel and each pulley, one end of each pulling rope is fixedly connected with the bottom of the movable plate, a movable seat is connected on each fixed shaft through, the bottom of first dust guard housing and second dust guard housing all runs through the top of rack main part and extends to in the cavity, the bottom of first dust guard housing and second dust guard housing respectively with the top fixed connection of two dead levers, the top of rack main part is equipped with fixed subassembly, can make first dust guard housing and second dust guard housing form a dust-proof chamber through driving motor, makes external dust can not get into the detector main part, can not influence the use.
Preferably, the fixed subassembly includes the backup pad of symmetry fixed connection at rack main part top, and the equal fixedly connected with electric putter in one side that two backup pads are close to each other, equal fixedly connected with pinch-off blades on two electric putter's the output shaft, and one side that two pinch-off blades are close to each other closely laminates with the both sides of detector main part respectively, and electric putter can make two pinch-off blades press from both sides tight fixedly to the detector main part, makes the detector main part can not take place to remove.
Preferably, the equal fixedly connected with electric telescopic handle in bottom four corners position of rack main part, electric telescopic handle's bottom fixedly connected with fixed plate, electric telescopic handle can adjust the height of detector main part, makes things convenient for the detector main part to detect the air of co-altitude not, increases detection range, has improved the comprehensiveness that detects.
Preferably, the shifting chute has been seted up to one side of removal seat, and the one end of two fixed axles extends to two shifting chutes respectively in, the equal fixedly connected with threading board in two shifting chutes, the one end of two fixed axles run through two threading boards respectively and respectively with two threading board threaded connection, set up shifting chute and threading board, can provide power for removing the seat.
Preferably, all set up flutedly on the both sides inner wall of cavity, the one end that two fixed axles kept away from each other extends to in two recesses respectively and rotates with one side inner wall of two recesses respectively and be connected, all overlaps on two fixed axles to be equipped with torque spring, torque spring's both ends respectively with one side of reel and one side inner wall fixed connection of recess, set up torque spring, can provide the power that resets for the fixed axle.
Preferably, equal fixedly connected with first spring on the both sides inner wall of cavity, the one end that two first springs are close to each other respectively with one side fixed connection of first dust guard housing and second dust guard housing, two first springs can provide reset power for first dust guard housing and second dust guard housing respectively.
Preferably, two fixing bases of symmetry fixedly connected with on the top inner wall of cavity, the fixed slot has all been seted up to the bottom of two fixing bases, equal sliding connection has the sliding plate in two fixed slots, the equal fixedly connected with montant in bottom of two sliding plates, the bottom of two montants all with the top fixed connection of movable plate, the equal fixedly connected with second spring in top of two sliding plates, the top of two second springs respectively with the top inner wall fixed connection of two fixed slots, set up fixed slot, sliding plate and montant, can make the movable plate can only longitudinal movement, can not rotate along with the pivot.
Preferably, two the equal fixedly connected with blotter in one side that the clamp plate is close to each other, the thickness of blotter is two to four centimetres, and one side that two blotters are close to each other closely laminates with the both sides of detector main part respectively, and two blotters not only can increase frictional force, make the clamp plate can be more fixed to the detector main part, can also cushion the clamp plate simultaneously, prevent that the clamp plate from causing the damage to the detector main part.
The invention has the beneficial effects that: owing to set up driving motor, driving motor can make the pivot rotate, the pivot can make the movable plate rebound, and then can drive the fixed axle through the stay cord and rotate, the fixed axle can make two removal seats drive the dead lever and remove, thereby can make first dust guard housing and second dust guard housing be close to each other and laminate, at this moment first dust guard housing and second dust guard housing can form a dustproof chamber like this, with the protection of detector main part in dustproof chamber, make external dust can not get into the detector main part, can not influence the use.
Owing to set up electric putter, electric putter can make two clamp plates press from both sides tight fixedly to the detector main part, makes the detector main part can not take place to remove, has set up electric telescopic handle simultaneously, and electric telescopic handle can highly adjust the detector main part, makes things convenient for the detector main part to detect the air of co-altitude not, increases detection range, has improved the comprehensiveness that detects.
The air dust-proof device is reasonable in structure and simple in operation, the first dust-proof shell and the second dust-proof shell can form a dust-proof cavity through the driving motor, external dust cannot enter the detector main body, the use cannot be influenced, meanwhile, the detector main body can detect air with different heights, the detection range is enlarged, and the detection comprehensiveness is improved.
Drawings
Fig. 1 is a schematic three-dimensional structure diagram of a dustproof device of an air detector placing rack provided by the invention;
fig. 2 is a schematic front view of a dustproof device of an air detector placement rack according to the present invention;
FIG. 3 is a schematic main sectional view of a dust-proof device of an air detector placement rack according to the present invention;
FIG. 4 is a schematic cross-sectional view of a movable base of a dust-proof device of an air detector placement rack according to the present invention;
fig. 5 is an enlarged schematic structural diagram of a portion a of a dust-proof device of an air detector placing rack according to the present invention.
In the figure: the detection device comprises a placing frame main body 1, a detection device main body 2, a cavity 3, a driving motor 4, a rotating shaft 5, a moving plate 6, a pulley 7, a fixed shaft 8, a reel 9, a moving seat 10, a fixed rod 11, a first dustproof shell 12, a second dustproof shell 13, an electric push rod 14, a clamping plate 15, a cushion pad 16, an electric telescopic rod 17, a fixed plate 18, a moving groove 19, a threaded plate 20, a first spring 21, a fixed groove 22, a sliding plate 23, a vertical rod 24, a groove 25, a torsion spring 26, a pull rope 27, a supporting plate 28, a fixed seat 29 and a second spring 30.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example one
Referring to fig. 1-5, the present embodiment provides a dust-proof device for an air detector placement frame, which includes a placement frame main body 1, a detector main body 2, a first dust-proof housing 12 and a second dust-proof housing 13, wherein a cavity 3 is formed on the placement frame main body 1, a driving motor 4 is fixedly connected to the bottom inner wall of the cavity 3, a rotating shaft 5 is fixedly connected to an output shaft of the driving motor 4, the top end of the rotating shaft 5 is rotatably connected to the top inner wall of the cavity 3, a moving plate 6 is screwed to the rotating shaft 5, two pulleys 7 are symmetrically arranged on the bottom inner wall of the cavity 3, fixed shafts 8 are rotatably connected to the inner walls of both sides of the cavity 3, a reel 9 is fixedly sleeved on each of the two fixed shafts 8, the same pulling rope 27 is wound around the reel 9 and the pulley 7, one end of each pulling rope 27 is fixedly connected to the bottom, the top parts of the two movable seats 10 are fixedly connected with fixed rods 11, the bottom parts of the first dustproof shell 12 and the second dustproof shell 13 penetrate through the top part of the placement frame main body 1 and extend into the cavity 3, the bottom parts of the first dustproof shell 12 and the second dustproof shell 13 are respectively fixedly connected with the top parts of the two fixed rods 11, the top part of the placement frame main body 1 is provided with a fixed component, the first dustproof shell 12 and the second dustproof shell 13 can form a dustproof cavity through a driving motor 4, so that external dust can not enter the detector main body 2 and can not affect the use, due to the arrangement of the driving motor 4, the driving motor 4 can enable the rotating shaft 5 to rotate, the rotating shaft 5 can enable the movable plate 6 to move upwards, further the fixed shaft 8 can be driven to rotate through a pull rope 27, the fixed shaft 8 can enable the two movable seats 10 to drive the fixed rods 11 to move, and therefore the first dustproof shell 12 and the second dustproof shell 13 can be close, thus, the first dustproof shell 12 and the second dustproof shell 13 form a dustproof cavity to protect the detector main body 3 in the dustproof cavity, so that external dust cannot enter the detector main body 2 and the use is not influenced, the electric push rod 14 is arranged, the electric push rod 14 can enable the two clamping plates 15 to clamp and fix the detector main body 2, so that the detector main body 2 cannot move, meanwhile, the electric telescopic rod 17 is arranged, the electric telescopic rod 17 can adjust the height of the detector main body 2, the detector main body 2 can conveniently detect air with different heights, the detection range is enlarged, the detection comprehensiveness is improved, the dust-proof device has a reasonable structure and is simple to operate, the first dustproof shell 12 and the second dustproof shell 13 can form a dustproof cavity through the driving motor 4, so that the external dust cannot enter the detector main body 2, use will not be influenced, can make the detector main part 2 can detect the air of co-altitude not simultaneously, increases detection range, has improved the comprehensiveness that detects.
Example two
In this embodiment, fixed subassembly includes the backup pad 28 of symmetry fixed connection at rack main part 1 top, the equal fixedly connected with electric putter 14 in one side that two backup pads 28 are close to each other, equal fixedly connected with clamp plate 15 on two electric putter 14's the output shaft, one side that two clamp plates 15 are close to each other is closely laminated with the both sides of detector main part 2 respectively, electric putter 14 can make two clamp plates 15 press from both sides tight fixedly to detector main part 2, make detector main part 2 can not take place to remove.
In this embodiment, the equal fixedly connected with electric telescopic handle 17 in rack main part 1's bottom four corners position, electric telescopic handle 17's bottom fixedly connected with fixed plate 18, electric telescopic handle 17 can highly adjust detector main part 2, makes things convenient for detector main part 2 to detect the air of co-altitude not, increases detection range, has improved the comprehensiveness that detects.
In this embodiment, a moving groove 19 is formed in one side of the moving seat 10, one ends of the two fixing shafts 8 respectively extend into the two moving grooves 19, threaded plates 20 are fixedly connected to the two moving grooves 19, one ends of the two fixing shafts 8 respectively penetrate through the two threaded plates 20 and are respectively in threaded connection with the two threaded plates 20, and the moving groove 19 and the threaded plates 20 are arranged to provide power for the moving seat 10.
In this embodiment, all seted up recess 25 on the both sides inner wall of cavity 3, the one end that two fixed axles 8 kept away from each other extends to in two recesses 25 respectively and rotates with one side inner wall of two recesses 25 respectively and be connected, all overlaps on two fixed axles 8 to be equipped with torsion spring 26, torsion spring 26's both ends respectively with one side of reel 9 and one side inner wall fixed connection of recess 25, set up torsion spring 26, can provide the power that resets for fixed axle 8.
In this embodiment, the inner walls of the two sides of the cavity 3 are fixedly connected with the first springs 21, the ends of the two first springs 21 close to each other are fixedly connected with one sides of the first dust-proof housing 12 and the second dust-proof housing 13, and the two first springs 21 can provide the reset power for the first dust-proof housing 12 and the second dust-proof housing 13 respectively.
In this embodiment, two fixing bases 29 of symmetry fixedly connected with on the top inner wall of cavity 3, fixed slot 22 has all been seted up to the bottom of two fixing bases 29, equal sliding connection has sliding plate 23 in two fixed slots 22, the equal fixedly connected with montant 24 in bottom of two sliding plates 23, the bottom of two montants 24 all with the top fixed connection of movable plate 6, the equal fixedly connected with second spring 30 in top of two sliding plates 23, the top of two second springs 30 respectively with the top inner wall fixed connection of two fixed slots 22, set up fixed slot 22, sliding plate 23 and montant 24, can make movable plate 6 can only longitudinal movement, can not rotate along with pivot 5.
In this embodiment, the equal fixedly connected with blotter 16 in one side that two clamp plates 15 are close to each other, the thickness of blotter 16 is two to four centimetres, and one side that two blotters 16 are close to each other closely laminates with the both sides of detector main part 2 respectively, and two blotters 16 not only can increase frictional force, make clamp plate 15 can be more fixed to detector main part 2, can also cushion clamp plate 15 simultaneously, prevent that clamp plate 15 from causing the damage to detector main part 2.
In the embodiment, when the detector is used specifically, the detector main body 2 is placed on the top of the placement frame main body 1, then the two electric push rods 14 are started, the output shafts of the two electric push rods 14 respectively enable the two clamping plates 15 to approach each other, so that the detector main body 2 can be clamped and fixed, friction force can be increased due to the two buffering cushions 16, the clamping plates 15 can fix the detector main body 2, the clamping plates 15 can be buffered, the damage to the detector main body 2 caused by the clamping plates 15 is prevented, then the driving motor 4 is started, the output shaft of the driving motor 4 can enable the rotating shaft 5 to rotate, the rotating shaft 5 rotates to enable the moving plate 6 to move upwards due to the fact that the rotating shaft 5 is in threaded connection with the moving plate 6, the moving plate 6 ascends to pull the pull rope 27, so that the reel 9 and the fixed shaft 8 can be driven to rotate, and, therefore, the rotation of the fixed shaft 8 can make the screw plate 20 move, the two screw plates 20 can respectively make the two moving seats 10 move to one side close to each other, the two moving seats 10 can respectively make the two vertical rods 24 drive the first dustproof shell 12 and the second dustproof shell 13 to close to each other until being attached to each other, at this time, the first dustproof shell 12 and the second dustproof shell 13 can form a dustproof cavity, the detector main body 3 is protected in the dustproof cavity, external dust can not enter the detector main body 2, meanwhile, the electric telescopic rod 17 can be started, the electric telescopic rod 17 can drive the rack main body 1 to adjust the height, the detector main body 2 can conveniently detect air with different heights, the air detection is more comprehensive, electrical components appearing in the text are electrically connected with an external main controller and 220V mains supply, and the main controller can play a role in controlling conventional known equipment for computers and the like, and the fixed connection mode among this technical scheme can adopt modes such as welding or bolt fastening to fix according to actual demand.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A dustproof device of an air detector placing frame comprises a placing frame main body (1), a detector main body (2), a first dustproof shell (12) and a second dustproof shell (13), and is characterized in that a cavity (3) is formed in the placing frame main body (1), a driving motor (4) is fixedly connected to the inner wall of the bottom of the cavity (3), a rotating shaft (5) is fixedly connected to the output shaft of the driving motor (4), the top end of the rotating shaft (5) is rotatably connected with the inner wall of the top of the cavity (3), a movable plate (6) is connected to the rotating shaft (5) in a threaded manner, two pulleys (7) are symmetrically arranged on the inner wall of the bottom of the cavity (3), fixed shafts (8) are rotatably connected to the inner walls of two sides of the cavity (3), a winding wheel (9) is fixedly sleeved on each of the two fixed shafts (8), and the same pull rope (27) is wound on each winding wheel (, one end of each of the two pull ropes (27) is fixedly connected with the bottom of the movable plate (6), the two fixed shafts (8) are in threaded connection with the movable seats (10), the top parts of the two movable seats (10) are fixedly connected with the fixed rods (11), the bottoms of the first dustproof shell (12) and the second dustproof shell (13) penetrate through the top of the rack main body (1) and extend into the cavity (3), the bottoms of the first dustproof shell (12) and the second dustproof shell (13) are respectively fixedly connected with the top parts of the two fixed rods (11), the top part of the rack main body (1) is provided with a fixed assembly, the fixed assembly comprises support plates (28) which are symmetrically and fixedly connected with the top part of the rack main body (1), one sides of the two support plates (28) which are close to each other are fixedly connected with electric push rods (14), and the output shafts of the two electric push rods (14) are fixedly connected with clamping plates (15, one side of each of the two clamping plates (15) close to each other is tightly attached to the two sides of the detector main body (2) respectively.
2. The dustproof device of the air detector placement rack according to claim 1, wherein four corners of the bottom of the placement rack main body (1) are fixedly connected with electric telescopic rods (17), and the bottom of each electric telescopic rod (17) is fixedly connected with a fixing plate (18).
3. The dustproof device of the air detector placing frame according to claim 1, wherein a moving groove (19) is formed in one side of the moving seat (10), one end of each of the two fixing shafts (8) extends into the two moving grooves (19), threaded plates (20) are fixedly connected into the two moving grooves (19), and one end of each of the two fixing shafts (8) penetrates through the two threaded plates (20) and is in threaded connection with the two threaded plates (20) respectively.
4. The dustproof device of the air detector placing frame according to claim 1, wherein the two side inner walls of the cavity (3) are respectively provided with a groove (25), one ends of the two fixing shafts (8) which are far away from each other respectively extend into the two grooves (25) and are respectively connected with the inner wall of one side of the two grooves (25) in a rotating manner, the two fixing shafts (8) are respectively sleeved with a torsion spring (26), and two ends of the torsion spring (26) are respectively fixedly connected with one side of the reel (9) and the inner wall of one side of the groove (25).
5. The dustproof device of the air detector placement rack according to claim 1, wherein the inner walls of the two sides of the cavity (3) are fixedly connected with first springs (21), and one ends, close to each other, of the two first springs (21) are fixedly connected with one sides of the first dustproof shell (12) and the second dustproof shell (13) respectively.
6. The dustproof device of the air detector placing frame according to claim 1, wherein two fixed seats (29) are symmetrically and fixedly connected to the inner wall of the top of the cavity (3), fixed grooves (22) are formed in the bottoms of the two fixed seats (29), sliding plates (23) are slidably connected to the two fixed grooves (22), vertical rods (24) are fixedly connected to the bottoms of the two sliding plates (23), the bottom ends of the two vertical rods (24) are fixedly connected to the top of the moving plate (6), second springs (30) are fixedly connected to the tops of the two sliding plates (23), and the top ends of the two second springs (30) are fixedly connected to the inner walls of the top of the two fixed grooves (22).
7. The dustproof device of the air detector placing frame according to claim 1, wherein one side, close to each other, of each of the two clamping plates (15) is fixedly connected with a cushion pad (16), the thickness of each cushion pad (16) is two to four centimeters, and one side, close to each other, of each cushion pad (16) is tightly attached to two sides of the detector main body (2) respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911370718.9A CN111271552B (en) | 2019-12-26 | 2019-12-26 | Dustproof device of air detector placing frame |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911370718.9A CN111271552B (en) | 2019-12-26 | 2019-12-26 | Dustproof device of air detector placing frame |
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| CN111271552A CN111271552A (en) | 2020-06-12 |
| CN111271552B true CN111271552B (en) | 2021-04-27 |
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| CN112227281A (en) * | 2020-10-13 | 2021-01-15 | 瞿启芳 | Tunnel cleaning device based on piston effect |
| CN114352871A (en) * | 2021-12-24 | 2022-04-15 | 中科检测技术服务(重庆)有限公司 | Indoor air quality intelligent detection device |
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| JPH07235074A (en) * | 1994-02-23 | 1995-09-05 | Clarion Co Ltd | Dust-proof device for optical head |
| CN109296916A (en) * | 2018-12-05 | 2019-02-01 | 湖南文理学院 | A kind of Digital Media convenient for adjusting tilt angle is played with can cover projection arrangement |
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| JP4775871B2 (en) * | 1999-04-14 | 2011-09-21 | 有限会社ハイメック | Up-and-down adjustable loading table |
| CN106903521B (en) * | 2017-03-09 | 2018-12-21 | 绍兴柯桥标马化纤有限公司 | Frock clamp is used in a kind of cylindric workpiece punching |
| CN207421670U (en) * | 2017-11-17 | 2018-05-29 | 咸宁职业技术学院 | A kind of land surveying horizontal fixture |
| CN208036318U (en) * | 2018-01-29 | 2018-11-02 | 苏州市永固金属制品有限公司 | A kind of data small handcart with dust reduction capability |
| CN109654338A (en) * | 2018-12-31 | 2019-04-19 | 天津知道教育科技有限公司 | Practical instruments used for education lifting operating platform |
| CN109712343A (en) * | 2019-01-07 | 2019-05-03 | 何小钟 | A kind of self-service terminal of the collectable dust with dust-proof mechanism |
| CN209641106U (en) * | 2019-01-28 | 2019-11-15 | 莆田学院 | A kind of multimedia teaching apparatus for computer |
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| JPH07235074A (en) * | 1994-02-23 | 1995-09-05 | Clarion Co Ltd | Dust-proof device for optical head |
| CN109296916A (en) * | 2018-12-05 | 2019-02-01 | 湖南文理学院 | A kind of Digital Media convenient for adjusting tilt angle is played with can cover projection arrangement |
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