Display apparatus for promotion

Abstract

A display apparatus for promotion, which apparatus belongs to the technical field of promotion and display. By means of the display apparatus, promotion materials can be passively displayed; moreover, a status section (3) is provided at a side of a promotion section (2), such that a learning situation can be displayed by means of the status section (3). A learner can select a learning time and content, and can also send a learning site to a display stand (1); after receiving learning-related information, the display stand (1) can dispatch a promotion unmanned aerial vehicle (8) to deliver in place a related book material (26) and a projector (27) provided with promotion content; after receiving the book material (26) and the projector (27), the learner learns; and after the learning ends, the promotion unmanned aerial vehicle (8) reports the learning situation back to the display stand (1), and the corresponding learning situation is then updated by means of the status section (3). In this way, compared with existing display apparatuses, the display apparatus in the present application incorporates a supervision function and a learning material delivery function.

Description

A display device for promotional purposes Technical Field

[0001] This invention relates to the field of publicity and display technology, and more specifically to a display device for publicity. Background Technology

[0002] In publicity, the commonly used tools are bulletin boards and display boards. When displaying materials, the materials to be promoted are placed on the bulletin board or display board, or the promotional materials are projected on the bulletin board. Existing publicity is merely a passive display process. It cannot track whether the displayed content has been learned, let alone grasp the degree of learning of the displayed content. Existing publicity display devices are only passive publicity and cannot guarantee whether the publicity content has been learned, resulting in poor learning effects. In the prior art, patent document 1 (CN115222220A) discloses an organizational life management platform, which includes an organizational life management terminal and a mobile terminal, enabling the monitoring and evaluation of learning progress and effectiveness, and providing convenience for users. However, this management platform is accessed via mobile phones or computers and cannot provide an external display like existing bulletin boards. In response, prior art, such as patent document 2 (CN219046230U), discloses a mobile bulletin board with a bulletin board panel installed below the drone structure. The drone moves the bulletin board, facilitating its movement and improving its promotional effect. However, it only addresses the movement of the bulletin board and does not track the promotional effect. Regarding stable hovering of drones in the air, patent document 3 (CN116215900A) discloses a dual-airbag unmanned aerial vehicle (UAV). It includes two airbags, each equipped with a rotor. By filling the airbags with helium, the aircraft can float, and the rotor motion enables movement. A connecting arm is also installed between the two airbags, with a camera mounted on it, allowing for effective hovering and filming. While the two airbags provide excellent levitation, they also affect the aircraft's speed. At high altitudes, the airbags are often affected by strong winds, which can prevent the aircraft from operating at high altitudes. Furthermore, the presence of the airbags increases wind resistance, significantly extending the aircraft's flight time compared to existing drones. Moreover, the inclusion of two airbags makes the aircraft highly susceptible to wind, potentially altering its flight path and making its flight uncontrollable.

[0003] In summary, existing promotional display devices either passively promote information or simply establish a management platform at the client level. None of them can simultaneously provide physical promotional displays, proactively deliver learning materials to learners based on their needs, and provide real-time feedback on learning outcomes. Therefore, this invention provides a promotional display device that uses drones to deliver promotional materials, enabling simultaneous promotion and delivery of content to learners, facilitating multi-party learning, and tracking learning progress. Summary of the Invention

[0004] The technical problem to be solved by this invention is to provide a display device for publicity, comprising: a display rack, a bulletin board, a status bar, and a book and material placement area. The bulletin board and status bar are located at the upper end of the display rack, and the book and material placement area is located at the lower end of the display rack. Several charging ports are also provided at the top of the display rack for connecting to a publicity drone, which is placed on top of the display rack. The bulletin board displays publicity content, and the status bar displays the learning status of the content on the bulletin board. If there is any unlearned content, the status bar generates a reminder message to promptly follow up on the learning. The reminder message is sent to the learner, who registers the learning time, content, and address. After receiving the registration information, the display shelf sends it to the promotional drone. The drone flies from the top of the display shelf to the book and material placement area. The book pushing component at the back of the book placement area moves to push the corresponding books and materials into the drone's placement cavity, and then places the projector into the placement cavity as well. The drone then transports the books, materials, and projector to the designated location for learning. After the learning is completed, the drone sends the learning completion status to the display shelf, which displays the updated learning status.

[0005] Preferably, the promotional drone includes a spherical outer frame assembly and a rotor assembly. The rotor assembly is located at the upper end of the spherical outer frame assembly. The spherical outer frame assembly includes a spherical outer frame and a lower magnetic base. The spherical outer frame includes a top horizontal ring, a middle horizontal ring, a ball-placement plate, and several vertical support rods. The top horizontal ring, middle horizontal ring, and ball-placement plate are arranged horizontally from top to bottom and are connected and supported by the several vertical support rods. An airbag and an air supply assembly are provided at the upper end of the ball-placement plate. When the placement cavity, as a carrying space, is loaded with a projector and books / materials, the airbag is in a deflated state. The projector and books / materials are placed at the ball-placement plate, and the placement cavity is formed inside the spherical outer frame. After the projector and books / materials are loaded, the rotor assembly operates. Arrive at the designated location according to the registered time and place, remove the projector and books / materials, and install the projector at the lower end of the lower magnetic base. Simultaneously, the airbag is filled with hydrogen or helium, and the airbag begins to expand. After expanding to a certain extent, inflation stops, and the drone is suspended by the buoyancy provided by the gas in the airbag. The rotor assembly stops moving. Connect the cable between the projector and the charging plug, and the projector starts working. After the learning is complete, the rotor assembly moves, and the air in the airbag is expelled, causing the airbag to gradually shrink. Then, remove the projector and cable, retrieve the relevant books / materials, and place them back into the storage cavity. The drone flies back to the display shelf, and after returning the books / materials and projector to their original positions, the drone returns to the charging port to recharge.

[0006] Preferably, the advertising drone further includes a wind direction adjustment component, which is rotatably disposed within the top horizontal ring. The wind direction adjustment component includes: a rotating frame, an upper take-up roller, a flexible fabric, a drooping rod assembly, a left take-up cable, and a right take-up cable. The rotating frame is rotatably disposed inside the top horizontal ring. The flexible fabric is wound onto the upper take-up roller, and the lower end of the flexible fabric is fixedly disposed in the middle of the drooping rod assembly. The left and right take-up cables are both disposed at the lower end of the rotating frame, and the ends of the left and right take-up cables are respectively connected to the two sides of the drooping rod assembly. The length of the flexible fabric extending can be controlled by controlling the extension and retraction of the left and right take-up cables.

[0007] Preferably, a return torsion spring is provided between the upper take-up roller and the top horizontal ring. The left and right take-up cables have the same structure, each including a take-up drum and a cable. The cable is wound on the take-up drum, and the end of the cable is connected to the drooping rod group. The gravity of the drooping rod group can straighten the flexible fabric. When it is necessary to unfold the flexible fabric, the left and right take-up cables are driven to extend, and the flexible fabric is pulled out by the gravity of the drooping rod group. At the same time, the return torsion spring is also torsioned to store the restoring force. After being pulled out to the end, the left and right take-up cables stop moving. When it is necessary to retract the flexible fabric, the left and right take-up cables are driven to retract, and the return torsion spring releases the stored restoring force, causing the flexible fabric to retract.

[0008] Preferably, the drooping rod assembly includes a main rod and left and right telescopic rods telescopically disposed at both ends of the main rod. The left and right telescopic rods are capable of active extension and retraction. When the flexible cloth is extended, the left and right telescopic rods extend and can be engaged with the lower end of the middle horizontal ring to fix the flexible cloth. A rotational drive power source is provided between the top horizontal ring and the rotating frame. A wind sensor is also provided at the spherical outer frame, which can detect the magnitude and direction of the wind. When the wind direction is detected to be the same as the forward direction of the advertising drone, the flexible cloth is extended, and the left and right telescopic rods are engaged with the lower end of the middle horizontal ring. When the advertising drone needs to turn, the rotating frame can be driven to rotate relative to the top horizontal ring, so that the flexible cloth forms a spiral structure, thereby utilizing the wind force to generate a turning force.

[0009] Preferably, the rotating ring includes a rotating ring body and a sliding hinge seat 1 and a sliding hinge seat 2 disposed at the lower end of the rotating ring body. The lower end of the rotating ring body is provided with a receiving cavity 1 and a receiving cavity 2. The sliding hinge seat 1 is slidably disposed in the receiving cavity 1, and the sliding hinge seat 2 is slidably disposed in the receiving cavity 2. The sliding hinge seat 1 and the sliding hinge seat 2 have the same structure, each including a base plate 1 and a first support ear and a second support ear disposed on the base plate 1. The first support ear and the second support ear are both provided with hinge holes. The sliding hinge seat 1 and the sliding hinge seat 2 are respectively slidably disposed in the receiving cavity 1 and the receiving cavity 2. A first elastic element is disposed between the sliding hinge seat 1 and the receiving cavity 1, and a second elastic element is disposed between the sliding hinge seat 2 and the receiving cavity 2. Roller support holes 1 and 2 are respectively provided on the inner side of the rotating ring body. The two ends of the upper take-up roller are respectively rotatably disposed in the roller support holes 1 and 2, and the take-up cylinder is rotatably disposed in the hinge holes.

[0010] Preferably, the display rack is provided with a base, a side support wall and an upper display frame from bottom to top. The base and the side support wall form the book and document placement area. The book pushing and placing assembly is provided on the side support wall and includes a number of pushing cylinders and a number of book pushing plates. The number of pushing cylinders and book pushing plates are the same. The book pushing plates are arranged side by side and close together. The extension and retraction of the pushing cylinders drives the extension and retraction of the book pushing plates, thereby enabling the selection of books and documents.

[0011] Preferably, an opening and closing door is provided on one side of the spherical outer frame.

[0012] Preferably, the two promotional drones are connected by a connecting assembly, which includes a first connecting rod, a second connecting rod, an adjustable plate assembly connecting the first and second connecting rods, and a push rotor mounted on the adjustable plate assembly. One end of the first connecting rod is connected to one promotional drone, and the other end is connected to the adjustable plate assembly; one end of the second connecting rod is connected to the other promotional drone, and the other end is connected to the adjustable plate assembly. The adjustable plate assembly is rotatably connected to the first connecting rod, and it is also rotatably connected to the second connecting rod. The adjustable plate assembly can be adjusted to change its tilt angle relative to the two promotional drones. The first and second connecting rods are respectively connected to the two sides of the adjustable plate assembly. The push rotor is located on the rear side of the adjustable plate assembly. When projecting, the projector is mounted on the upper end of the adjustable plate assembly.

[0013] Preferably, the advertising drone further includes a wind direction adjustment component, which is rotatably disposed within the top horizontal ring. The wind direction adjustment component includes a rotating frame, an upper take-up roller, a flexible fabric, a drooping rod assembly, a take-up / release rope one, and a take-up / release rope two. The rotating frame is rotatably disposed inside the top horizontal ring. The flexible fabric is rolled up on the upper take-up roller, and the lower end of the flexible fabric is fixedly disposed in the middle of the drooping rod assembly. The take-up / release rope one is disposed at one end of the drooping rod assembly and the lower end of the spherical outer frame, and the take-up / release rope two is disposed at the other end of the drooping rod assembly and the lower end of the spherical outer frame. When it is necessary to pull out the flexible fabric, the take-up / release rope one and the take-up / release rope two retract, and the upper take-up roller is in the unwinding state.

[0014] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0015] 1. The promotional display device of the present invention, in addition to passively displaying promotional materials, also has a status bar set next to the promotional display. The status bar can display the learning status. The learner can select the learning time and content, and send the learning location to the display shelf. After receiving the learning information, the display shelf can dispatch a promotional drone to transport the relevant learning materials and a projector with promotional content for learning. Moreover, after the learning is completed, the learning status can be reported back to the display shelf, and the corresponding learning status can be updated through the status bar. Thus, compared with the existing display devices that only passively display rotating materials, it can add the functions of supervision and transportation of learning materials.

[0016] 2. To facilitate advertising, the drone of this invention features a hollow spherical frame structure with a storage cavity. This design not only serves as a loading space but also minimizes the impact of airflow during high-altitude flight. Furthermore, to enable the drone to hover effectively during projection operations, an airbag structure is incorporated at the bottom of the spherical frame. During normal flight or transport, the airbag is retracted at the bottom of the spherical frame. When the drone arrives, its cargo is unloaded, and it needs to hover for projection, the airbag is filled with hydrogen or helium, allowing the drone to hover while simultaneously stopping the rotor assembly, thus conserving energy.

[0017] 3. The promotional drone of this invention takes into account that it is likely to encounter strong winds during flight. If this wind can be utilized, the flight speed and efficiency of the drone can be improved. Therefore, a wind direction adjustment component is also set on the drone. The wind direction adjustment component uses a retractable flexible cloth. The flexible cloth acts like a sail used on a ship. Both the upper and lower ends of the flexible cloth can be fixed in a fixed state when the wind is blowing. Thus, when the direction of the wind is the same as the direction of the drone's flight, the flexible cloth can be used to make the drone fly faster.

[0018] 4. In addition, in order to utilize wind power for rotation while the drone is rotating, the upper part of the wind direction adjustment component is rotatable relative to the spherical outer frame, while the lower part of the wind direction adjustment component is in a relatively fixed state. In this way, by rotating the upper part of the wind direction adjustment component, the flexible fabric as a whole can form a spiral fabric. The spiral fabric can guide the wind direction from one direction to another wind direction that is clamped to the first direction, thereby quickly helping the drone to make corresponding turns or even turn around.

[0019] 5. Finally, the applicant's drone can also be configured as two drones, which can be connected by a connecting component. This configuration allows the drones and books to be placed in different drone placement cavities during transport, avoiding collisions between the books and the projector that could damage the projector. In addition, using two drones in conjunction can reduce the load on a single drone during transport. The projector placement base can also be positioned between the two drones. When the projector needs to be repositioned for projection, the left and right lateral tilt of the projector can be adjusted by controlling the different degrees of inflation of the airbags of the two drones. The front and rear longitudinal tilt of the projector can be adjusted by adjusting the rotation angle of the first rotating ring and the second rotating ring, thus enabling better adjustment of the projector. Attached Figure Description

[0020] Figure 1 is a schematic diagram of the display device structure;

[0021] Figure 2 is a cross-sectional view AA of Figure 1;

[0022] Figure 3 is a schematic diagram of the structure of the promotional drone of the first embodiment;

[0023] Figure 4 shows enlarged views B and C of Figure 3;

[0024] Figure 5 is a schematic diagram of the promotional drone structure when the wind direction adjustment component is deployed;

[0025] Figure 6 is a schematic diagram of the rotating circular frame structure;

[0026] Figure 7 shows the enlarged view E and magnified view F of Figure 5;

[0027] Figure 8 shows a first embodiment of a promotional drone in projection mode;

[0028] Figure 9 is a schematic diagram of the promotional drone structure of the second embodiment;

[0029] Figure 10 is a schematic diagram of the connecting component structure;

[0030] Figure 11 shows a second embodiment of a promotional drone in projection mode;

[0031] Figure 12 is a simplified structural diagram of a wind direction adjustment component according to another embodiment.

[0032] The components include: 1. Display rack; 2. Bulletin board; 3. Status bar; 4. Book and document storage area; 5. Charging port one; 6. Charging port two; 7. Book stacking assembly; 8. Promotional drone; 9. Spherical outer frame assembly; 10. Rotor assembly; 11. Wind direction adjustment assembly; 12. Placement cavity; 13. Placement ball plate; 14. Vertical support rod; 15. Top horizontal ring; 16. Middle horizontal ring; 17. Rotating circular frame; 18. Top retraction mechanism. 19. Fabric roller; 20. Flexible fabric; 21. Dragging rod assembly; 22. Left winding cable assembly; 23. Right winding cable assembly; 24. Main rod; 25. Left telescopic rod; 26. Right telescopic rod; 27. Books and documents; 28. Projector; 29. ​​Lower magnetic base one; 30. Rotating ring; 31. Receiving cavity one; 32. Sliding hinge seat one; 33. Sliding hinge seat two; 34. Base plate one; 35. First lug; 36. Second lug; 37. 6. Hinge hole; 37. Roller support hole one; 38. Roller support hole two; 39. Airbag; 40. Cable; 41. Rotor bracket one; 42. Rotor bracket two; 43. Rotor bracket three; 44. Rotor bracket four; 45. Blade; 46. Connecting assembly; 47. Connecting rod one; 48. Connecting rod two; 49. Adjustable plate assembly; 50. Push rotor; 51. Support plate; 52. First rotating ring; 53. Second 54. Rotating ring; 55. Upper magnetic base; 56. Wire hole; 57. Rear rotating shaft; 58. Base; 59. Side support wall; 60. Upper display frame; 61. Book pusher; 62. Push cylinder; 63. Winding drum; 64. Cable assembly; 65. Winding edge fabric one; 66. Winding edge fabric two; 67. Wire hole one; 68. Wire hole two; 69. Winding rope one; 70. Winding rope two; 71. Spherical outer frame; 72. Receiving cavity two. Detailed Implementation

[0033] The present invention will be further described below with reference to embodiments. However, the present invention is not limited to the following embodiments. The implementation conditions used in the embodiments can be further adjusted according to different requirements of specific applications, and the implementation conditions not specified are conventional conditions in the industry. The technical features involved in the various embodiments of the present invention can be combined with each other as long as they do not conflict with each other.

[0034] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0035] The following disclosure provides many different implementations or examples for carrying out different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0036] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0037] Example 1

[0038] As shown in Figures 1-8, a display device for promotion includes: a display rack 1, a bulletin board 2, a status bar 3, and a book and material placement area 4. The bulletin board 2 and status bar 3 are located at the upper end of the display rack 1, and the book and material placement area 4 is located at the lower end of the display rack 1. Several charging ports are also provided at the top of the display rack 1 for connecting to a promotional drone 8, which is placed on top of the display rack 1 (not shown in Figure 1). The bulletin board 2 displays promotional content, such as posters or electronic displays. The status bar 3 is located on the side of the bulletin board 2 and displays its content. The system monitors the learning progress. If learner A has completed the learning, status bar 3 will display a message indicating that learner A completed the learning on a specific day and at a specific location. If learner B has not yet completed the learning, status bar 3 will display a reminder message such as "Learner B has not yet completed the learning; please follow up on your learning." This reminder message can be delivered to learner B's mobile phone or other mobile devices via the internet, WeChat, or an app. Learner B can register their learning time, content, and address on WeChat or the app. After receiving the registered information, display rack 1 sends it to promotional drone 8. Promotional drone 8 flies from the top of display rack 2 to book and document placement area 4, triggering the book pushing component 7 at the back of book placement area 4. The corresponding books and materials 26 are pushed into the placement cavity 12 of the advertising drone 8, and then the projector 27 is also placed into the placement cavity 12 (it can be removed manually, or the projector 27 can be placed in the book and material placement area 4 beforehand and pushed into the placement cavity 12 by the book pushing component). The advertising drone 8 includes a spherical outer frame assembly 9 and a rotor assembly 10. The rotor assembly 10 is located at the upper end of the spherical outer frame assembly 9 to provide power for its flight. The spherical outer frame assembly 9 includes a spherical outer frame 70 and a lower magnetic base 28. The spherical outer frame 70 includes a top horizontal ring 15, a middle horizontal ring 16, a ball placement plate 13, and several vertical support rods 14. The top horizontal ring 15, the middle horizontal ring 16, and the ball placement plate 13 are connected to the lower magnetic base 28. The rotor assembly 10 is horizontally arranged from top to bottom and supported by several vertical support rods 14. An airbag 39 and a corresponding air supply component are located at the upper end of the placement plate 13 (the air supply component is not specifically shown in the figure; it only needs to supply air to the airbag 39; specific air supply components are common knowledge in the art and will not be described in detail here. The gas supplied to the airbag 39 by the air supply component can be hydrogen or helium). When the placement cavity 12, as a transport space, contains the projector 27 and books / documents 26, the airbag 39 is in a deflated, airless state. The projector 27 and books / documents 26 are placed on the placement plate 13. The placement cavity 12 is formed inside the spherical outer frame 70. After the projector 27 and books / documents 26 are loaded, the rotor assembly 10 operates.According to the registered time and location, the promotional drone 8 flies to the corresponding meeting room or study room, etc. After arriving, it sends the arrival information to the mobile phone or other mobile device of the learner B. Upon receiving the information, learner B goes to the location of the promotional drone 8, takes out the projector 27 and the books and materials 26, and installs the projector 27 at the lower end of the lower magnetic base 28 as shown in Figure 8. At the same time, the airbag 39 is filled with hydrogen or helium and begins to inflate. After inflating to a certain extent, the inflation stops. The promotional drone 8 is buoyed by the gas in the airbag 39 and is in a suspended state. At this time, the rotor assembly 10 can be stopped. The cable 40 is connected between the projector 27 and the charging plug (the charging plug is not shown, but any ordinary charging plug will suffice). Thus, cable 40 can both power the projector 27 and tether the promotional drone 8. When the projector 27 starts working, it projects pre-recorded or stored promotional videos, images, or text. After the learning is completed, the promotional drone 8 records that the learner B has learned and then sends this record back to the status bar 3. The status bar 3 is then updated to record that the learner B has learned. Through the above-mentioned display device, the learning status of each learner can be monitored. When learning is needed, the learner B can choose the learning time, content, and location, and then the display device will arrange to transport the learning materials and related audio and video to the learning location. This ensures the safety of the materials and avoids the trouble of preparing materials, enabling the promotional work to be carried out more effectively. After the learning process is complete, the rotor assembly 10 actuates, simultaneously expelling air from the airbag 39, causing the airbag 39 to gradually shrink. Then, the projector 27 and cable 40 are removed, and the relevant books and materials 26 are retrieved and placed back into the placement cavity 12. The promotional drone 8 flies back to the display shelf 1, returning the books and materials 26 and projector 27 to their original positions. Finally, the promotional drone 8 returns to the charging port to recharge.

[0039] To ensure that the promotional information is effectively delivered, follow-up learning reminders can also be sent to the learners' mobile phones or other mobile devices via the internet, WeChat, or apps.

[0040] In addition, to ensure that the drone can verify the integrity of the projector and books, a camera can be installed on the promotional drone 8. When the drone detects that the projector and books have been put back into the placement cavity 12, it takes a picture and compares it with the pre-stored image. If the comparison is successful, the projector and books are returned, and the promotional drone 8 starts to fly back to the display shelf 1. If the projector or books are still missing, a prompt will be issued until all items have been returned, and then the promotional drone 8 will start to fly back to the display shelf 1.

[0041] In addition, to facilitate the return of the books and materials 26 and the projector 27 to their original positions, a robot can be placed on or around the display shelf 1. The robot's robotic arm can return the projector 27 and the books and materials 26 to their original positions. The specific structure of the robot is common knowledge in the field and is not the focus of this application, so it will not be described in detail here.

[0042] As shown in Figures 3-7, the advertising drone 8 also includes a wind direction adjustment component 11. The wind direction adjustment component 11 is rotatably disposed within the top horizontal ring 15. The wind direction adjustment component 11 includes: a rotating circular frame 17, an upper winding roller 18, a flexible fabric 19, a drooping rod group 20, a left winding cable 21, and a right winding cable 22. The rotating circular frame 17 is rotatably disposed inside the top horizontal ring 15. The flexible fabric 19 is wound onto the upper winding roller 18, and the lower end of the flexible fabric 19 is fixedly disposed in the middle of the drooping rod group 20. The left winding cable 21 and the right winding cable 22 are both disposed at the lower end of the rotating circular frame 17. The ends of the left winding cable 21 and the right winding cable 22 are respectively connected to the two sides of the drooping rod group 20. By controlling the extension and retraction of the left winding cable 21 and the right winding cable 22, the length of the flexible fabric 19 can be controlled.

[0043] Furthermore, a return torsion spring (not shown in the figure) is provided between the upper take-up roller 18 and the top horizontal ring 15. The left take-up cable 21 and the right take-up cable 22 have the same structure, both including a take-up drum 62 and a cable 63. The cable 63 is wound on the take-up drum 62. The end of the cable 63 is connected to the drooping rod group 20. The gravity of the drooping rod group 20 can straighten the flexible fabric 19. When it is necessary to unfold the flexible fabric 19, the left take-up cable 21 and the right take-up cable 22 are extended, and the flexible fabric 19 is pulled out by the gravity of the drooping rod group 20. At the same time, the return torsion spring is also twisted to store the restoring force. After being pulled out to the end, the left take-up cable 21 and the right take-up cable 22 stop moving. When it is necessary to retract the flexible fabric 19, the left take-up cable 21 and the right take-up cable 22 retract, and the return torsion spring releases the stored restoring force, driving the flexible fabric 19 to retract.

[0044] To enable the wind direction adjustment assembly 11 to better utilize wind power for navigation or turning, the drooping rod assembly 20 includes a main rod 23 and a left telescopic rod 24 and a right telescopic rod 25 telescopically disposed at both ends of the main rod 23. The left and right telescopic rods 24 and 25 can be actively extended and retracted via hydraulic cylinders or telescopic cylinders. When the flexible fabric 19 is stretched, the left and right telescopic rods 24 and 25 extend and can engage with the lower end of the middle horizontal ring 16, thus securing the flexible fabric 19. A rotary drive power source is provided between the top horizontal ring 15 and the rotating frame 17. This rotary drive power source can be achieved by providing a gear ring on the outer circumference of the rotating frame 17 and a drive motor with a drive gear inside the top horizontal ring 15. The rotation of the drive motor drives the drive gear to rotate, thereby rotating the rotating frame 17. Furthermore, to cooperate with the wind direction adjustment assembly 11… The system also includes a wind sensor (not shown in the figure, but its specific structure is common knowledge in the field and will not be described in detail here) installed at the spherical outer frame 70. This sensor can detect the magnitude and direction of the wind. When the wind direction is detected to be the same as the direction of travel of the advertising drone 8, the flexible cloth 19 extends, and the left telescopic rod 24 and the right telescopic rod 25 are engaged with the lower end of the middle horizontal ring 16. At this time, the flexible cloth 19 acts like a sail, enabling the advertising drone 8 to operate faster and more energy-efficiently. In addition, when the advertising drone needs to turn, the rotating frame 17 can be driven to rotate relative to the top horizontal ring 15, so that the flexible cloth 19 forms a spiral structure. This allows the wind to be used to generate a turning force, making the advertising drone 8 more flexible in turning, saving its operating power, and allowing for better control of the operation of the advertising drone 8.

[0045] Further, as shown in Figures 6-7, the rotating ring 17 includes a rotating ring body 29 and a sliding hinge seat 31 and a sliding hinge joint seat 32 disposed at the lower end of the rotating ring body 29. The lower end of the rotating ring body 29 is provided with a receiving cavity 30 and a receiving cavity 71. The sliding hinge seat 31 is slidably disposed within the receiving cavity 30, and the sliding hinge joint seat 32 is slidably disposed within the receiving cavity 71. The sliding hinge seat 31 and the sliding hinge joint seat 32 have the same structure, both including a base plate 33 and a first lug 34 and a second lug 36 disposed on the base plate 33. Both the first lug 34 and the second lug 36 have hinge holes 36. The sliding hinge seat 31 and the sliding hinge joint seat 32... The upper take-up roller 18 is slidably disposed in the first receiving cavity 30 and the second receiving cavity 71, respectively. A first elastic element is disposed between the first sliding hinge seat 31 and the first receiving cavity 30, and a second elastic element is disposed between the second sliding hinge seat 32 and the second receiving cavity 71. Roller support holes 37 and 38 are respectively opened on the inner side of the rotating ring 29. The two ends of the upper take-up roller 18 are rotatably disposed in the first roller support hole 37 and the second roller support hole 38, respectively. The take-up drum 62 is rotatably disposed in the hinge hole 36. In addition, both the take-up drum 62 and the upper take-up roller 18 include a rotation drive source, such as a rotary motor, etc. (not shown in the figure; the specific drive source structure is common knowledge in the art and is not the focus of this application, so it will not be described in detail). The first receiving cavity 30 and the second receiving cavity 71 are configured such that, under normal circumstances, the first sliding hinge seat 32 and the second sliding hinge seat 32 can be held at the lower end of the rotating ring body 29 by the first elastic member and the second elastic member, and can be retracted into the rotating ring body 29 when the airbag 39 is filled with the spherical outer frame 70, so as to ensure that the airbag 39 will not be affected when fully deployed and to ensure the safety of the airbag 39.

[0046] Additionally, as shown in Figure 8, the rotor assembly 10 includes rotor support 1 41, rotor support 2 42, rotor support 3 43, and rotor support 44 disposed on the top horizontal ring 15, and blades 45 disposed on rotor support 1 41, rotor support 2 42, rotor support 3 43, and rotor support 44. The blades 45 can be driven to rotate by a separate drive motor, which is common knowledge in the art, and the specific structure of the drive motor will not be described in detail.

[0047] In addition, the lower magnetic base 27 can be configured as a base with an electromagnet inside, and a corresponding magnetic structure is provided at the upper end of the projector 27, such as a permanent magnet or an electromagnet. The electromagnet of the lower magnetic base 27 is normally de-energized, but when the projector needs to be placed, the electromagnet is charged, thereby attracting the projector 27 for projection. In addition, the specific connection between the projector and the lower magnetic base can also be through a detachable mechanical connection method such as pin connection, hook connection, etc. The specific mechanical connection method is common knowledge in the art and will not be described in detail here.

[0048] As shown in Figure 1, the display rack 1 is provided with a base 57, a side support wall 58 and an upper display frame 59 from bottom to top. The base 57 and the side support wall 58 form the book and document placement area 4. The book pushing and placing assembly 7 is disposed on the side support wall 58, which includes a number of pushing cylinders 61 and a number of book pushing plates 60. The number of pushing cylinders 61 and book pushing plates 60 is the same. The book pushing plates 60 are arranged side by side and close together. The extension and retraction of the pushing cylinders 61 drives the extension and retraction of the book pushing plates 60, thereby enabling the selection of books and documents 26.

[0049] As shown in Figure 1, the charging port includes charging port 5 and charging port 6, which are used to charge the advertising drone 8.

[0050] Additionally, not shown in the figure, an opening / closing door is provided on one side of the spherical outer frame 70. This door can be constructed by configuring part of the vertical support rods 14 and the central horizontal ring 16 into a door structure, and then opening and closing the door structure is achieved through a cylinder or hydraulic cylinder. The specific opening / closing door structure is common knowledge in the art; as long as it can open and close the placement cavity 12, allowing books, documents, and projectors to be placed into or removed from the placement cavity 12, it is sufficient. This is not the focus of this application and will not be elaborated upon here. Besides sliding door structures, the opening / closing door can also be a push-pull door, a hinged door, etc.

[0051] Example 2

[0052] As shown in Figures 9-11, the main difference between Embodiment 2 and Embodiment 1 is that Embodiment 2 uses two advertising drones 8, which are connected by a connecting component 46. Furthermore, the magnetic base in Embodiment 2 is placed on the connecting component 46, rather than on the lower end of the spherical outer frame 70. Specifically:

[0053] Two advertising drones 8 are connected by a connecting assembly 46. The connecting assembly 46 includes a first connecting rod 47, a second connecting rod 48, an adjustable plate assembly 49 connecting the first connecting rod 47 and the second connecting rod 48, and a push rotor 50 mounted on the adjustable plate assembly 49. One end of the first connecting rod 47 is connected to one advertising drone 8, and the other end is connected to the adjustable plate assembly 49. One end of the second connecting rod 48 is connected to the other advertising drone 8, and the other end is connected to the adjustable plate assembly 49. The adjustable plate assembly 49 is rotatably connected to the first connecting rod 47, and the adjustable plate assembly 49 is also rotatably connected to the second connecting rod 48. The tilt angle of the adjustable plate assembly 49 relative to the two advertising drones 8 can be adjusted. The first connecting rod 47 and the second connecting rod 48 are respectively connected to both sides of the adjustable plate assembly 49. The push rotor 50 is located on the rear side of the adjustable plate assembly 49. When projecting, the projector 27 is installed on the upper end of the adjustable plate assembly 49.

[0054] As shown in Figure 10, the adjustable plate assembly 49 includes a support plate 51, a first rotating ring 52 and a second rotating ring 53 fixedly disposed on both sides of the support plate 51, an upper magnetic suction seat 54 fixedly disposed on the upper end of the support plate 51, and a rear rotating shaft 56 fixedly disposed on the rear side of the support plate 51. The push rotor 50 is disposed on the rear rotating shaft 56. In addition, a wire hole 55 is also provided in the support plate 51.

[0055] One end of the connecting rod 47 extends into the first rotating ring 52, and the connecting rod 48 extends into the second rotating ring 53. A first rotating drive device and a second rotating drive device are respectively provided in the first rotating ring 52 and the second rotating ring 53. Both the first rotating drive device and the second rotating drive device include a rotating drive motor. A drive gear ring is provided on the outer periphery of the connecting rod 48 and the connecting rod 47. The rotating drive motor drives the drive gear ring to rotate, thereby realizing the angle adjustment of the adjustable plate group 49, which can adjust the projection angle of the projector.

[0056] During projection, the projector 27 is mounted on the upper magnetic base 2 54. A magnetic structure, such as an electromagnet or a permanent magnet, is provided at the lower end of the projector. An electromagnet is installed inside the upper magnetic base 2 54. When the projector needs to be fixed, the electromagnet inside the upper magnetic base 2 54 is energized to generate magnetic force, thereby fixing the projector.

[0057] Additionally, the hovering height of the two advertising drones 8 can be adjusted by regulating the inflation level of the two airbags 39, thereby adjusting the levelness of the support plate 51. This allows for adjustment of the projection angle of the projector 27, thus expanding the adjustment range of the projector's projection angle. The cable 40 can pass through the cable hole 55, facilitating its insertion into the socket.

[0058] Example 3

[0059] Furthermore, the only difference from Embodiments 1 and 2 lies in the structure of the specific wind direction adjustment component 11, which is as follows:

[0060] As shown in Figure 12, the wind direction adjustment component 11 includes: a rotating circular frame 17, an upper winding roller 18, a flexible fabric 19, a drooping rod assembly 20, a first winding rope 68, and a second winding rope 69. The rotating circular frame 17 is rotatably disposed inside the top horizontal ring 15. The flexible fabric 19 is wound onto the upper winding roller 18, and the lower end of the flexible fabric 19 is fixedly disposed in the middle of the drooping rod assembly 20. The first winding rope 68 is disposed at one end of the drooping rod assembly 20 and the lower end of the spherical outer frame 70. The second winding rope 69 is disposed at the other end of the drooping rod assembly 20 and the lower end of the spherical outer frame 70. When it is necessary to pull out the flexible fabric 19, the first winding rope 68 and the second winding rope 69 retract (e.g., by setting a roller structure), and the upper winding roller 18 is in the unwinding state.

[0061] To further increase the wind-receiving area of ​​the flexible fabric 19, the drooping rod assembly 20 includes a main rod 23 and a left telescopic rod 24 and a right telescopic rod 25 telescopically disposed at both ends of the main rod 23. The left telescopic rod 24 and the right telescopic rod 25 can be actively extended and retracted by a hydraulic cylinder or a telescopic cylinder. A first winding edge fabric 64 is provided at the left telescopic rod 24, and a second winding edge fabric 65 is provided at the right telescopic rod 25. One end of the first winding edge fabric 64 is wound around the upper winding fabric roller 18, and the other end of the first winding edge fabric 64... One end is set on the left telescopic rod 24, and the main rod 23 is provided with a slot for the first roll-up edge fabric 64 to pass through. One end of the second roll-up edge fabric 65 is wound on the upper roll-up roller 18, and the other end of the second roll-up edge fabric 65 is set on the right telescopic rod 25. The main rod 23 is provided with a slot for the second roll-up edge fabric 65 to pass through. When the left telescopic rod 24 and the right telescopic rod 25 are extended, the lateral area of ​​the first roll-up edge fabric 64 and the second roll-up edge fabric 65 increases, thereby increasing the wind-receiving area of ​​the flexible fabric 19.

[0062] Furthermore, the left telescopic rod 24 is provided with a wire hole 66, the right telescopic rod 25 is provided with a wire hole 67, the upper end of the take-up rope 68 is fixed in the wire hole 66, and the upper end of the take-up rope 69 is fixed in the wire hole 67.

[0063] When it is necessary to retract the flexible fabric 19, the left telescopic rod 24 and the right telescopic rod 25 are retracted, and at the same time, the upper winding roller 18 winds up the flexible fabric 19, and the winding rope 1 68 and winding rope 2 69 are in the unwinding state.

[0064] To facilitate understanding of the working principle of the promotional drone by those skilled in the art, the operation process of the promotional drone is described as follows: After receiving the instruction from the learner, the promotional drone 8 flies down from the top of the display stand 1. Then, the push cylinder 61 selects the corresponding book pusher 60 according to the materials needed for the learner's current learning. Simultaneously, the door structure of the promotional drone 8 is opened, and the outward-moving book pusher 60 pushes the books through the door structure to the top of the ball placement plate 13. At this time, the airbag 39 at the top of the ball placement plate 13 is retracted, and the airbag 39 also serves as a buffer and shock absorber. After the books have rotated, the projector is pushed by the corresponding book pusher 60, enters the placement cavity 12 through the door structure, and after being accommodated, the door structure closes. The promotional drone 8 then flies according to the learning time and location selected by the terminal. During flight, if the wind sensor detects the direction of the wind and the drone... When the flight direction is the same, the flexible cloth of the wind direction adjustment component 11 is in the unfolded state. Using the flexible cloth as a sail, the wind power makes the drone fly faster and more energy-efficiently. After arriving at the designated location, the projector and books are taken out by the personnel, the projector is installed, and then the airbag 39 is inflated. Finally, the expansion of the airbag 39 provides the power for the propaganda drone 8 to hover, gradually reducing the rotation speed of the rotor component 10 until the propaganda drone 8 is in the hovering state and the rotor component 10 is completely stopped. After the power cord is plugged in, the power cord provides power and can also hold the propaganda drone 8. After being powered on, the projector works, so that the content on the bulletin board 2 can be projected out for relevant personnel to learn. After the learning is completed, the propaganda drone 8 can send the learning completion status to the status bar 3, and the status bar 3 will update accordingly, so that a clear overall and comprehensive understanding of the learning status of each learner can be obtained. After the relevant personnel complete their training, the promotional drone 8 is loaded with books, materials, and a projector. The drone then flies back to the display stand 1. Simultaneously, a robot returns the books, materials, and projector to their original positions. The drone then returns to its charging station, completing one on-site promotional activity.

Claims

1. A display device for promotion, comprising: The display rack (1), bulletin board (2), status bar (3), and book and material placement area (4) are provided. The bulletin board (2) and status bar (3) are located at the upper end of the display rack (1), and the book and material placement area (4) is located at the lower end of the display rack (1). The display rack (1) is characterized by having several charging ports at the top, which are used to connect to a promotional drone (8). The promotional drone (8) is placed at the top of the display rack (1). The bulletin board (2) displays promotional content. The status bar (3) is used to display the learning status of each learner regarding the content of the bulletin board (2). If there is a situation where learning has not been completed, the status bar (3) generates a timely reminder message to follow up on the learning. This reminder message is transmitted to the learner. The learner registers the learning time, learning content and learning address information. After receiving the registration information, the display rack (1) sends the registration information to the publicity drone (8). The publicity drone (8) flies from the top of the publicity board (2) to the book and material placement area (4). The book pushing component (7) at the back of the book placement area (4) moves to push the corresponding books and materials (26) into the placement cavity (12) of the publicity drone (8). Then the projector (27) is also placed into the placement cavity (12). After the publicity drone (8) transports the books and materials (26) and the projector (27) to the designated location, the learner takes out the books and materials (26) and the projector (27) to study. After the study is completed, the publicity drone (8) sends the study completion status to the publicity board (2). The publicity board (2) displays the updated study status.

2. The display device for publicity according to claim 1, characterized in that: The propaganda drone (8) includes a spherical outer frame assembly (9) and a rotor assembly (10). The rotor assembly (10) is located at the upper end of the spherical outer frame assembly (9). The spherical outer frame assembly (9) includes a spherical outer frame (70) and a lower magnetic base (28). The spherical outer frame (70) includes a top horizontal ring (15), a middle horizontal ring (16), a ball placement plate (13), and several vertical support rods (14). The top horizontal ring (15), the middle horizontal ring (16), and the ball placement plate (13) are horizontally arranged from top to bottom. The device is configured and supported by several vertical support rods (14). An airbag (39) and an air supply assembly are provided at the upper end of the placement plate (13). When the projector (27) and books (26) are loaded in the placement cavity (12) as a transport space, the airbag (39) is in a deflated state. The projector (27) and books (26) are placed on the placement plate (13). The placement cavity (12) is formed inside the spherical outer frame (70). After the projector (27) and books (26) are loaded, The rotor assembly (10) moves, arriving at the designated location according to the registered time and place, and takes out the projector (27) and books (26). The projector (27) is installed at the lower end of the lower magnetic base (28). At the same time, the airbag (39) is filled with hydrogen or helium and begins to expand. After expanding to a certain extent, the inflation stops. The propaganda drone (8) is buoyed by the gas in the airbag (39) and is in a suspended state. The rotor assembly (10) stops moving, and the cable (40) is connected to the projector. Between the device (27) and the charging plug, the projector (27) starts working. After the learning is completed, the rotor assembly (10) moves, and at the same time, the air in the airbag (39) is discharged. The airbag (39) gradually shrinks. Then the projector (27) and cable (40) are removed, and the relevant books and materials (26) are retrieved and placed back into the placement cavity (12). The promotional drone (8) flies back to the display rack (1). After the books and materials (26) and the projector (27) are put back in their original positions, the promotional drone (8) returns to the charging port to charge.

3. A display device for publicity according to claim 2, characterized in that: The propaganda drone (8) also includes a wind direction adjustment component (11), which is rotatably disposed within the top horizontal ring (15). The wind direction adjustment component (11) includes: a rotating frame (17), an upper winding cloth roller (18), a flexible cloth (19), a drooping rod assembly (20), a left winding cable assembly (21), and a right winding cable assembly (22). The rotating frame (17) is rotatably disposed inside the top horizontal ring (15), and the flexible cloth (19) is wound up on the upper horizontal ring (15). The lower end of the flexible fabric (19) is fixedly disposed on the winding roller (18) and the lower end of the flexible fabric (19) is fixedly disposed in the middle of the drooping rod group (20). The left winding cable (21) and the right winding cable (22) are both disposed at the lower end of the rotating round frame (17). The ends of the left winding cable (21) and the right winding cable (22) are respectively connected to the two sides of the drooping rod group (20). The length of the flexible fabric (19) can be controlled by controlling the extension and shortening of the left winding cable (21) and the right winding cable (22).

4. A display device for publicity according to claim 3, characterized in that: A return torsion spring is provided between the upper take-up roller (18) and the top transverse ring (15). The left take-up cable (21) and the right take-up cable (22) have the same structure, both including a take-up drum (62) and a cable (63). The cable (63) is wound on the take-up drum (62). The end of the cable (63) is connected to the drooping rod assembly (20). The gravity of the drooping rod assembly (20) can straighten the flexible fabric (19). When it is necessary to unfold the flexible fabric (19)... The left winding cable (21) and the right winding cable (22) are driven to extend, and the flexible cloth (19) is pulled out by the gravity of the drooping rod group (20). At the same time, the return torsion spring is also twisted to store the restoring force. After being pulled out to the position, the left winding cable (21) and the right winding cable (22) stop moving. When it is necessary to retract the flexible cloth (19), the left winding cable (21) and the right winding cable (22) are driven to retract, and the return torsion spring releases the stored restoring force, which drives the flexible cloth (19) to retract.

5. A display device for publicity according to claim 4, characterized in that: The drooping rod assembly (20) includes a main rod (23) and a left telescopic rod (24) and a right telescopic rod (25) telescopically disposed at both ends of the main rod (23). The left telescopic rod (24) and the right telescopic rod (25) can actively extend and retract. The left telescopic rod (24) and the right telescopic rod (25) extend when the flexible cloth (19) is stretched, and can be inserted into the lower end of the middle horizontal ring (16) to fix the flexible cloth (19). A rotation drive power source is provided between the top horizontal ring (15) and the rotating circular frame (17), and a spherical... A wind sensor is installed at the outer frame (70), which can detect the magnitude and direction of the wind. When the wind direction is detected to be the same as the forward direction of the propaganda drone (8), the flexible cloth (19) is extended, and the left telescopic rod (24) and the right telescopic rod (25) are engaged in the lower end of the middle horizontal ring (16). When the propaganda drone needs to turn, the rotating frame (17) can be driven to rotate relative to the top horizontal ring (15), so that the flexible cloth (19) forms a spiral structure, thereby using the wind to form a turning force.

6. A display device for publicity according to claim 5, characterized in that: The rotating ring (17) includes a rotating ring body (29) and a sliding hinge seat 1 (31) and a sliding hinge joint seat 2 (32) disposed at the lower end of the rotating ring body (29). The lower end of the rotating ring body (29) is provided with a receiving cavity 1 (30) and a receiving cavity 2 (71). The sliding hinge seat 1 (31) is slidably disposed in the receiving cavity 1 (30), and the sliding hinge joint seat 2 (32) is slidably disposed in the receiving cavity 2 (71). The sliding hinge seat 1 (31) and the sliding hinge joint seat 2 (32) have the same structure, both including a base plate 1 (33) and a first lug (34) and a second lug (35) disposed on the base plate 1 (33). The first lug (34) and the second lug (35) is provided with hinge holes (36). The sliding hinge seat one (31) and the sliding hinge seat two (32) are slidably disposed in the receiving cavity one (30) and the receiving cavity two (71) respectively. A first elastic element is provided between the sliding hinge seat one (31) and the receiving cavity one (30). A second elastic element is provided between the sliding hinge seat two (32) and the receiving cavity two (71). Roller support holes one (37) and two roller support holes two (38) are provided on the inner side of the rotating ring (29). The two ends of the upper take-up roller (18) are rotatably disposed in the roller support holes one (37) and two roller support holes two (38) respectively. The take-up cylinder (62) is rotatably disposed in the hinge hole (36).

7. A display device for publicity according to claim 6, characterized in that: The display rack (1) is provided with a base (57), a side support wall (58) and an upper display frame (59) from bottom to top. The base (57) and the side support wall (58) form the book and document placement area (4). The book pushing component (7) is provided on the side support wall (58), which includes a number of pushing cylinders (61) and a number of book pushing plates (60). The number of pushing cylinders (61) and book pushing plates (60) is the same. The book pushing plates (60) are arranged side by side and close together. The pushing cylinders (61) extend and retract to drive the book pushing plates (60) to extend and retract, thereby enabling the selection of books and documents (26).

8. A display device for publicity according to any one of claims 2-7, characterized in that: An opening and closing door is provided on one side of the spherical outer frame (70).

9. A display device for publicity according to claim 2, characterized in that: Two propaganda drones (8) are connected by a connecting assembly (46), which includes a first connecting rod (47), a second connecting rod (48), an adjustable plate assembly (49) connecting the first connecting rod (47) and the second connecting rod (48), and a pusher rotor (50) mounted on the adjustable plate assembly (49). One end of the first connecting rod (47) is connected to one propaganda drone (8), and the other end is connected to the adjustable plate assembly (49); one end of the second connecting rod (48) is connected to the other propaganda drone (8), and the other end is connected to the adjustable plate assembly (49). The adjustable plate assembly (49) is rotatably connected to the first connecting rod (47), and the adjustable plate assembly (49) is also rotatably connected to the second connecting rod (48). The adjustable plate assembly (49) can adjust its tilt angle relative to the two advertising drones (8). The first connecting rod (47) and the second connecting rod (48) are respectively connected to both sides of the adjustable plate assembly (49). The push rotor (50) is located on the rear side of the adjustable plate assembly (49). When projecting, the projector (27) is installed on the upper end of the adjustable plate assembly (49).

10. A display device for publicity according to claim 2 or 9, characterized in that: The propaganda drone (8) also includes a wind direction adjustment component (11), which is rotatably disposed within the top horizontal ring (15). The wind direction adjustment component (11) includes a rotating frame (17), an upper winding cloth roller (18), a flexible cloth (19), a drooping rod assembly (20), a first winding rope (68), and a second winding rope (69). The rotating frame (17) is rotatably disposed inside the top horizontal ring (15), and the flexible cloth (19) is wound up on the upper winding roller. The lower end of the flexible fabric (19) is fixedly set on the fabric roller (18) and the lower end of the flexible fabric (19) is fixedly set in the middle of the drooping rod group (20). The first winding rope (68) is set at one end of the drooping rod group (20) and the lower end of the spherical outer frame (70). The second winding rope (69) is set at the other end of the drooping rod group (20) and the lower end of the spherical outer frame (70). When it is necessary to pull out the flexible fabric (19), the first winding rope (68) and the second winding rope (69) retract, and the upper winding fabric roller (18) is in the unwinding state.

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