CN114724424A - Imaging device for medical careers guidance - Google Patents

Imaging device for medical careers guidance Download PDF

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Publication number
CN114724424A
CN114724424A CN202210214569.2A CN202210214569A CN114724424A CN 114724424 A CN114724424 A CN 114724424A CN 202210214569 A CN202210214569 A CN 202210214569A CN 114724424 A CN114724424 A CN 114724424A
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China
Prior art keywords
fixed
motor
rail
medical
slide
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Pending
Application number
CN202210214569.2A
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Chinese (zh)
Inventor
姜玲红
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Jiangxi Health Vocational College
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Jiangxi Health Vocational College
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Priority to CN202210214569.2A priority Critical patent/CN114724424A/en
Publication of CN114724424A publication Critical patent/CN114724424A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B5/00Electrically-operated educational appliances
    • G09B5/06Electrically-operated educational appliances with both visual and audible presentation of the material to be studied
    • G09B5/065Combinations of audio and video presentations, e.g. videotapes, videodiscs, television systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
    • F16M11/02Heads
    • F16M11/18Heads with mechanism for moving the apparatus relatively to the stand
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M13/00Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles
    • F16M13/02Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B23/00Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
    • G09B23/28Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for medicine

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Educational Technology (AREA)
  • Educational Administration (AREA)
  • Business, Economics & Management (AREA)
  • Medicinal Chemistry (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Physics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Computational Mathematics (AREA)
  • Algebra (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Multimedia (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

The invention aims to provide imaging equipment for medical employment guidance, which comprises a placing device, wherein the placing device comprises a base, a first motor, a supporting disk, a mounting plate, a hydraulic rod and a placing platform, and is used for placing a specimen model so as to facilitate guidance and explanation; the camera device comprises a slide rail, a rack, a slide block, a second motor, a rail, a camera component, a third motor, a first roller, a first mounting block, a second roller, a slide bar, a tension spring and a second mounting block, can shoot at multiple angles and is convenient to observe; the display device comprises a shell, a screen and a loudspeaker and can amplify and display images shot by the camera shooting assembly.

Description

Imaging device for medical careers guidance
Technical Field
The invention relates to the technical field of medical equipment, in particular to imaging equipment for medical employment guidance.
Background
In medical career guidance, in order to better understand medical knowledge, biological specimens and models are often needed to be used, but the number of people is large in the learning process, all people cannot observe carefully, and the guidance purpose is difficult to achieve.
Medical imaging apparatus as claimed in CN201821909484.1, having at least one imaging component for generating image data of an examination object supported in an examination region, which imaging component is pivotably guided with respect to the examination region such that the imaging component can be positioned in different orbital angular positions with respect to an orbital rotation axis extending through the examination region, wherein at least one flexible wire connected with the imaging component is movably supported in an energy supply chain having a plurality of chain links articulated to one another, which chain links each accommodate a longitudinal section of at least one flexible wire, wherein the chain links of the energy supply chain are arranged within a spherical shell segment-shaped region around the examination region for each orbital angular position of the imaging component.
Also for imaging a robotically moved medical object as proposed in CN202110381956.0, having a moving device for robotically moving the medical object, a medical imaging apparatus and a processing unit. The processing unit is designed to receive a data set, wherein the data set maps a vascular structure of the examination object and is registered with the medical imaging apparatus, and to determine an object path in the data set along the vascular structure to the target region; the mobile device is designed to move the medical object along the object path and to provide object parameters relating to the movement state of the medical object; the processing unit is designed to control the positioning of the medical imaging apparatus relative to the examination object as a function of the object parameters and the object path such that predefined sections of the medical object are mapped in the image data recorded by means of the medical imaging apparatus.
The invention provides a device which can make a real-time image of the medical model and the specimen and amplify and display the image on the medical employment guidance course, so that students can better observe the model and the specimen, and the damage to the model specimen during carrying is reduced.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide an imaging apparatus for medical careers guidance, which can take a picture of a medical model and a specimen in real time and enlarge and display the image, so that students can observe the model and the specimen, and damage to the model specimen during transportation is reduced.
The invention provides an imaging device for medical employment guidance, which is characterized in that: the device comprises a placing device, wherein the placing device comprises a base, a first motor, a supporting disk, a mounting plate, a hydraulic rod and a placing platform, the base is fixed on the ground, the first motor is fixed on the base, a first gear is fixed on an output shaft of the first motor, the supporting disk is movably arranged on the base, a gear ring is arranged below the supporting disk and meshed with the first gear, the mounting plate is fixed above the supporting disk, the placing platform is rotatably arranged above the mounting plate, and the placing platform is also connected with the supporting disk through the hydraulic rod;
the camera device comprises a slide rail, a rack, a slide block, a second motor, a rail, a camera shooting component, a third motor, a first roller, a first installation block, a second roller, a slide rod, tension springs and a second installation block, wherein the slide rail is fixed on two sides below a placing platform, the rack is fixed below the placing platform and is positioned on the inner side of the slide rail, the slide block is movably arranged on the slide rail, the second motor is fixed at one end of the slide block, a second gear is fixed on an output shaft of the second motor and is meshed with the rack, the rail is positioned above the placing platform, two ends of the rail are fixed on the slide block, the camera shooting component is positioned below the rail, the third motor is fixed at four corners of the camera shooting component, the first roller is fixed on the third motor, the first installation block is fixed above the camera shooting component through the slide rod and is positioned above the rail, the second installation block is movably arranged on the slide rod and is positioned below the rail, the tension springs are arranged between the first installation block and the second installation block, second rollers are arranged on the two sides of the first mounting block and the second mounting block and are in contact with the surface of the track;
the display device comprises a shell, a screen and a loudspeaker, wherein the shell is fixed on a wall body, the screen is fixed in the center of the shell, and the loudspeaker is fixed in the shell and positioned at two ends of the screen.
Further, the base top rotary type is equipped with the ball, and the ball top supports the supporting disk, still is equipped with the mounting hole on the base.
Furthermore, a support rod is arranged below the support plate and is installed in the installation hole.
Furthermore, mounting panel and hydraulic stem alternating expression are connected in place the platform, and the mounting panel is opened there is the hole of dodging that corresponds.
Furthermore, the placing platform is of an L-shaped structure, one end of the placing platform is provided with a semicircular flanging, and the placing platform is provided with a drainage groove and a corresponding drainage hole.
Furthermore, the middle of the track is provided with an avoiding hole corresponding to the sliding rod and the tension spring, and the side surface of the track is provided with anti-skidding lines.
Furthermore, lighting assemblies are fixed on two sides of the camera assembly.
Furthermore, the shell both ends are equipped with the fixed plate, are equipped with the screw hole on the fixed plate.
Has the advantages that:
1. the base is fixed in subaerially, base top rotary type is equipped with the ball, still be equipped with the mounting hole, the supporting disk passes through ball movable mounting on the base, the below is equipped with the bracing piece, the bracing piece is installed in the mounting hole, place the platform still passes through hydraulic stem joint support dish, mounting panel and hydraulic stem alternating expression are connected in place the platform, the mounting panel is opened and is had the hole of dodging of correspondence, place the platform is "L" shape structure, one end is equipped with semi-circular turn-ups, rotatable and adjust inclination's place the platform, be favorable to putting of the sample model of equidimension and weight not, can adapt to the demonstration that the model sample that medical employment guided the in-process used also can the multi-angle simultaneously, be convenient for the explanation of employment guidance mr.
2. The slide block is movably mounted on the slide rail, the second motor is fixed at one end of the slide block, a second gear is fixed on an output shaft of the second motor and meshed with the rack, the track is located above the placing platform, two ends of the track are fixed on the slide block, the camera shooting assembly is located below the track and moves along the track, and the camera shooting assembly is matched with the movable slide block, so that the camera shooting assembly can be used for shooting a model specimen in a three-dimensional multi-angle mode, and more shooting key point details can be obtained.
3. On the shell was fixed in the wall body, the screen was fixed in shell central authorities, and the speaker is fixed in the shell, was located the screen both ends, utilizes the subassembly cooperation display device that makes a video recording to carry out image transmission and shows formation of image for can be better when explaining the model sample show some little details and notes, reduced the teaching equipment damage that frequently moves the model sample and bring.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a schematic diagram of the overall structure of the present invention.
Fig. 3 is an exploded view of the placement device of the present invention.
Fig. 4 is a schematic view of the overall structure of the support disc of the present invention.
Fig. 5 is a schematic view of the overall structure of the placement platform of the present invention.
Fig. 6 is a schematic view of the overall structure of the image pickup apparatus of the present invention.
Fig. 7 is a schematic diagram of the overall configuration of the imaging apparatus of the present invention.
Fig. 8 is a third schematic view of the overall configuration of the imaging apparatus of the present invention.
Fig. 9 is an exploded view of the camera device of the present invention.
Fig. 10 is a schematic view of the overall structure of the display device of the present invention.
Reference numerals: a base 1; a ball 2; a mounting hole 3; a first motor 4; a first gear 5; a support disc 6; a support bar 7; a ring gear 8; a mounting plate 9; a hydraulic rod 10; a placement platform 11; a slide rail 12; a rack 13; a drain hole 14; a water discharge tank 15; a slider 16; a second motor 17; a second gear 18; a rail 19; a camera assembly 20; a third motor 21; a first roller 22; an illumination assembly 23; a first mounting block 24; a second roller 25; a slide bar 26; a tension spring 27; a second mounting block 28; a housing 29; a screen 30; a loudspeaker 31.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments, and in order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below, which are, of course, merely examples and are not intended to limit the present invention.
Referring to the drawings, an image forming apparatus for medical employment guidance according to an embodiment of the present invention will be described, as shown in fig. 1 to 10, the image forming apparatus for medical employment guidance includes a placement device, the placement device includes a base 1, a first motor 4, a support plate 6, a mounting plate 9, a hydraulic rod 10, and a placement platform 11, the base 1 is fixed on the ground, a ball 2 is rotatably provided above the base 1, a mounting hole 3 is further provided, the first motor 4 is fixed on the base 1, a first gear 5 is fixed on an output shaft of the first motor 4, the support plate 6 is movably mounted on the base 1 through the ball 2, a support rod 7 is provided below the support plate 7, the support rod 7 is mounted in the mounting hole 3, a ring gear 8 is provided below the support plate 6 and is engaged with the first gear 5, the mounting plate 9 is fixed above the support plate 6, the placement platform 11 is rotatably mounted above the mounting plate 9, the placement platform 11 is further connected to the support plate 6 through the hydraulic rod 10, mounting panel 9 and hydraulic stem 10 alternating expression are connected in place the platform 11, and mounting panel 9 is opened there is corresponding hole of dodging, and place the platform 11 is "L" shape structure, and one end is equipped with semi-circular turn-ups, and the slope of the sample model of being convenient for is put, and place the platform 11 and go up to open and to have water drainage tank 15 to be equipped with corresponding wash port 14, be convenient for discharge sample sepage, also be convenient for wash clearance place the platform 11.
In a specific embodiment: first motor 4 starts through external power supply, drives first gear 5 and rotates, and then makes and place the dish and rotate, is convenient for adjust the angle of putting of placing dish and place the platform 11, and hydraulic stem 10 can stretch out and draw back through hydraulic drive, and then changes place the platform 11 put the angle, makes things convenient for the transport of sample and model and puts.
As shown in fig. 6, 7, 8 and 9, the imaging apparatus for medical employment guidance includes an imaging device, the imaging device includes a slide rail 12, a rack 13, a slider 16, a second motor 17, a rail 19, an imaging component 20, a third motor 21, a first roller 22, a first mounting block 24, a second roller 25, a slide bar 26, a tension spring 27 and a second mounting block 28, the slide rail 12 is fixed on both sides of the lower portion of the placing platform 11, the rack 13 is fixed on the lower portion of the placing platform 11 and is located inside the slide rail 12, the slider 16 is movably mounted on the slide rail 12, the second motor 17 is fixed on one end of the slider 16, a second gear 18 is fixed on an output shaft of the second motor 17 and is meshed with the rack 13, the rail 19 is located above the placing platform 11, both ends are fixed on the slider 16, the imaging component 20 is located below the rail 19, the third motor 21 is fixed on each corner of the imaging component 20, the illumination components 23 are fixed on both sides of the imaging component 20, the light source can be provided, the image pickup is convenient, a first roller 22 is fixed on the third motor 21, a first mounting block 24 is fixed above the image pickup assembly 20 through a sliding rod 26 and is positioned above the track 19, a second mounting block 28 is movably mounted on the sliding rod 26 and is positioned below the track 19, a tension spring 27 is arranged between the first mounting block 24 and the second mounting block 28, the second rollers 25 are arranged on two sides of the first mounting block 24 and the second mounting block 28 and are in surface contact with the track 19, avoidance holes corresponding to the sliding rod 26 and the tension spring 27 are formed in the middle of the track 19, and anti-skid grains are arranged on the side surface of the track 19.
In a specific embodiment: the camera assembly 20 can drive the first roller 22 to rotate through the third motor 21, and then the camera assembly 20 can move on the track 19, the second rollers 25 on the two sides of the first installation block 24 in the moving process enable the camera assembly 20 to be hung below the track 19, the second installation block 28 utilizes the tension of the tension spring 27, the first installation block 24 is matched, the track 19 is clamped, the camera assembly 20 and the track 19 keep a relative distance, the stability of the camera assembly 20 in the using process is ensured, images shot by the camera assembly 20 are more stable and clear, meanwhile, the camera assembly 20 moves along the track 19, the model specimens can be shot at multiple angles, the details of the model specimens are better displayed, and the identification degree of the camera assembly is increased.
The sliding block 16 is engaged with the rack 13 through a second gear 18 fixed on an output shaft of the second motor 17 to generate thrust, so as to drive the track 19 to move, change the shooting position of the camera component 20, and facilitate adjustment of the shooting point position.
As shown in fig. 10, the imaging apparatus for medical caregiving guidance includes a display device, the display device includes a housing 29, a screen 30 and speakers 31, the housing 29 is fixed on a wall, fixing plates are provided at both ends, screw holes are provided on the fixing plates, the screen 30 is fixed at the center of the housing 29, and the speakers 31 are fixed in the housing 29 at both ends of the screen 30.
In a specific embodiment: the screen 30 is connected to the camera assembly 20 through a connecting line, so as to perform real-time video display.
The working principle is as follows: the first motor 4 is started through an external power supply to drive the first gear 5 to rotate, so that the placing plate rotates, the placing plate and the placing platform 11 can be conveniently adjusted in placing angle, and the hydraulic rod 10 can be driven to stretch through hydraulic pressure, so that the placing angle of the placing platform 11 can be changed; the sliding block 16 is meshed with the rack 13 through a second gear 18 fixed on an output shaft of a second motor 17 to generate thrust, so that a track 19 is driven to move, and the shooting position of the shooting component 20 is changed; the second rollers 25 on the two sides of the first mounting block 24 enable the camera assembly 20 to be suspended below the track 19, the second mounting block 28 is matched with the first mounting block 24 by means of the tensile force of the tension spring 27 to clamp the track 19, the camera assembly 20 keeps a relative distance with the track 19, the third motor 21 drives the first roller 22 to rotate, the camera assembly 20 can move on the track 19, the screen 30 is connected with the camera assembly 20 through a connecting line, and real-time video display is performed.

Claims (8)

1. An imaging apparatus for medical caregiving guidance, characterized in that: comprises that
The placing device comprises a base, a first motor, a supporting disk, a mounting plate, a hydraulic rod and a placing platform, wherein the base is fixed on the ground, the first motor is fixed on the base, a first gear is fixed on an output shaft of the first motor, the supporting disk is movably arranged on the base, a gear ring is arranged below the supporting disk and is meshed with the first gear, the mounting plate is fixed above the supporting disk, the placing platform is rotatably arranged above the mounting plate, and the placing platform is also connected with the supporting disk through the hydraulic rod;
the camera device comprises a slide rail, a rack, a slide block, a second motor, a rail, a camera shooting component, a third motor, a first roller, a first installation block, a second roller, a slide rod, tension springs and a second installation block, wherein the slide rail is fixed on two sides below a placing platform, the rack is fixed below the placing platform and is positioned on the inner side of the slide rail, the slide block is movably arranged on the slide rail, the second motor is fixed at one end of the slide block, a second gear is fixed on an output shaft of the second motor and is meshed with the rack, the rail is positioned above the placing platform, two ends of the rail are fixed on the slide block, the camera shooting component is positioned below the rail, the third motor is fixed at four corners of the camera shooting component, the first roller is fixed on the third motor, the first installation block is fixed above the camera shooting component through the slide rod and is positioned above the rail, the second installation block is movably arranged on the slide rod and is positioned below the rail, the tension springs are arranged between the first installation block and the second installation block, second rollers are arranged on the two sides of the first mounting block and the second mounting block and are in contact with the surface of the track;
the display device comprises a shell, a screen and a loudspeaker, wherein the shell is fixed on a wall body, the screen is fixed in the center of the shell, and the loudspeaker is fixed in the shell and positioned at two ends of the screen.
2. The imaging apparatus for medical caregiving guidance as set forth in claim 1, wherein a ball is rotatably provided above the base, a support plate is supported above the ball, and a mounting hole is provided in the base.
3. The imaging apparatus for medical caregiving guidance as set forth in claim 2, wherein a support rod is provided below the support plate, the support rod being fitted in the fitting hole.
4. The medical career guidance imaging device of claim 1, wherein the mounting plate and the hydraulic rod are connected to the placement platform in a staggered manner, and the mounting plate is provided with corresponding avoiding holes.
5. The imaging apparatus for medical career guidance as claimed in claim 1, wherein the platform is "L" shaped, and has a semicircular flange at one end, and the platform is provided with a drainage groove and a corresponding drainage hole.
6. The imaging apparatus for medical career guidance as set forth in claim 1, wherein an avoiding hole corresponding to the slide bar and the tension spring is opened in the middle of the rail, and the side of the rail is provided with the anti-slip pattern.
7. The medical career guidance imaging apparatus as set forth in claim 1, wherein an illumination unit is fixed to both sides of the camera unit.
8. The imaging apparatus for medical caregiving guidance as set forth in claim 1, wherein fixing plates are provided at both ends of the housing, and screw holes are provided on the fixing plates.
CN202210214569.2A 2022-03-07 2022-03-07 Imaging device for medical careers guidance Pending CN114724424A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210214569.2A CN114724424A (en) 2022-03-07 2022-03-07 Imaging device for medical careers guidance

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Application Number Priority Date Filing Date Title
CN202210214569.2A CN114724424A (en) 2022-03-07 2022-03-07 Imaging device for medical careers guidance

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105333281A (en) * 2015-11-30 2016-02-17 陈立坡 Rotating and lifting stability-enhancement platform for signal tracking equipment
CN206692593U (en) * 2017-03-28 2017-12-01 嘉兴宏达包装科技有限公司 A kind of novel adhesive tape
CN110867114A (en) * 2019-12-20 2020-03-06 向欣 External simulation training device for blood vessel interventional therapy
CN210777503U (en) * 2019-02-28 2020-06-16 商丘师范学院 City planning stand of simulation shadow
CN210920636U (en) * 2019-08-22 2020-07-03 杭州市勘测设计研究院 Portable three-dimensional laser scanning measuring instrument
CN111583729A (en) * 2020-04-09 2020-08-25 沈阳师范大学 Artwork detail display device suitable for visual transmission course
CN213424395U (en) * 2020-11-01 2021-06-11 上海市山之田模型设计有限公司 Building sand table display device
CN113347404A (en) * 2021-06-11 2021-09-03 西安工业大学 Three-dimensional point cloud processing device and processing method thereof
CN215933003U (en) * 2021-08-26 2022-03-01 孙瑞民 Rotation type sand table of real estate development

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105333281A (en) * 2015-11-30 2016-02-17 陈立坡 Rotating and lifting stability-enhancement platform for signal tracking equipment
CN206692593U (en) * 2017-03-28 2017-12-01 嘉兴宏达包装科技有限公司 A kind of novel adhesive tape
CN210777503U (en) * 2019-02-28 2020-06-16 商丘师范学院 City planning stand of simulation shadow
CN210920636U (en) * 2019-08-22 2020-07-03 杭州市勘测设计研究院 Portable three-dimensional laser scanning measuring instrument
CN110867114A (en) * 2019-12-20 2020-03-06 向欣 External simulation training device for blood vessel interventional therapy
CN111583729A (en) * 2020-04-09 2020-08-25 沈阳师范大学 Artwork detail display device suitable for visual transmission course
CN213424395U (en) * 2020-11-01 2021-06-11 上海市山之田模型设计有限公司 Building sand table display device
CN113347404A (en) * 2021-06-11 2021-09-03 西安工业大学 Three-dimensional point cloud processing device and processing method thereof
CN215933003U (en) * 2021-08-26 2022-03-01 孙瑞民 Rotation type sand table of real estate development

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