A display device for promoting

Abstract

The invention discloses a display device for propaganda, and belongs to the technical field of propaganda display. The display device can not only passively display propaganda materials, but also is provided with a state column on the side of the propaganda column. The state column can display the learning situation, so that the learning object can select the learning time and content, and send the learning place to the display stand. After receiving the learning information, the display stand can send a propaganda unmanned aerial vehicle to the learning place to deliver the related learning materials and a projector with propaganda content, and then update the learning situation through the state column after the learning is completed. The display device increases the functions of supervision and delivery of learning materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of publicity display, in particular to a display device for publicity. BACKGROUND

[0002] In publicity, the commonly used are publicity columns, publicity display boards, etc. In display, the data to be publicized is placed on the publicity column or display board, or the publicity data is played on the publicity column. The existing publicity is only a passive display process, which cannot track whether the displayed content has been learned, and cannot grasp how the learning degree of the displayed content is. The existing publicity display device is only passive publicity, and cannot guarantee that the publicity content is learned and the learning effect is not good. In the prior art, patent document 1 (CN115222220A) discloses an organization life management platform, which sets an organization life management end, a mobile end, etc., can supervise and evaluate the learning situation and learning effect, and can be used conveniently by everyone, but the management platform is carried out through a mobile phone or a computer, etc., and cannot have an external display physical object like the existing publicity column; for this, in the prior art, patent document 2 (CN219046230U) discloses a publicity column convenient to move, which sets a publicity column plate below a unmanned aerial vehicle structure, moves the publicity column through the unmanned aerial vehicle, can conveniently move the publicity column, and can improve the publicity effect of the publicity column, but it cannot track the publicity effect; in the prior art, for the stable hovering of the unmanned aerial vehicle in the air, patent document 3 (CN116215900A) discloses a double air bag unmanned aerial vehicle, which includes two air bags, the two air bags are provided with rotors, helium is filled into the air bags, so that the air bags can be used for floating, and then the rotors are actuated, so that the movement of the aerial vehicle can be realized, a connecting arm is arranged between the two air bags, and a camera is arranged on the connecting arm, so that the hovering and shooting of the unmanned aerial vehicle can be realized well. The arrangement of the two air bags can provide good hovering capability for the aerial vehicle, but it affects the running speed of the unmanned aerial vehicle. Since the air bags are often affected by strong wind in the high air, if there is strong wind in the high air, the aerial vehicle cannot run in the high air. Moreover, since the air bags exist, the wind resistance of the unmanned aerial vehicle in the air becomes very large when the unmanned aerial vehicle runs in the air, which greatly increases the running time of the unmanned aerial vehicle. Compared with the existing unmanned aerial vehicle, the running time is often longer. Moreover, since the aerial vehicle includes two air bags when running, it is easily affected by wind when running. When it is windy, the flight route of the aerial vehicle may change, and the flight becomes uncontrollable.

[0003] In summary, the existing display device for propaganda, either passive propaganda, or just in the client level set up management platform, and can not both entity propaganda display, and can actively according to the learning needs, can be delivered to the learning object learning materials, and can real-time feedback learning effect display device, for this purpose, the present application provides a kind of through unmanned aerial vehicle propaganda material delivery, can be in propaganda while also can deliver propaganda content to learning personnel, can multi-party simultaneously learning, can track learning effect, for the display device of propaganda. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a display device for propaganda, which comprises a display stand, a propaganda column, a status column and a book material placing area, the propaganda column and the status column are arranged at the upper end of the display stand, the book material placing area is arranged at the lower end of the display stand, a plurality of charging ports are further arranged at the top end of the display stand, the charging ports are used to connect with the propaganda unmanned aerial vehicle, the propaganda unmanned aerial vehicle is parked at the top end of the display stand, the propaganda column displays the propaganda content, the status column is used to display the learning situation of the content of the propaganda column, if there is a learning situation, the status column generates a prompt information for timely follow-up learning, the prompt information is delivered to the learning object, the learning object registers the learning time, learning content and learning address information, after the display stand receives the registration information, the display stand sends the registration information to the propaganda unmanned aerial vehicle, the propaganda unmanned aerial vehicle flies from the top end of the propaganda column to the book material placing area, the book pushing assembly at the rear end of the book placing area acts to push the corresponding book material into the placing cavity of the propaganda unmanned aerial vehicle, and then the projector is also placed into the placing cavity, after the propaganda unmanned aerial vehicle is transported to the designated place, the book material and the projector are taken out for learning, after the learning is completed, the propaganda unmanned aerial vehicle sends the learning completion situation to the propaganda column, and the propaganda column displays the updated learning situation.

[0005] Preferably, the propaganda unmanned aerial vehicle comprises a spherical outer frame assembly and a rotor assembly, the rotor assembly is arranged at the upper end of the spherical outer frame assembly, the spherical outer frame assembly comprises a spherical outer frame and a lower magnetic seat I, the spherical outer frame comprises a top horizontal ring, a middle horizontal ring, a ball plate and a plurality of vertical support rods, the top horizontal ring, the middle horizontal ring and the ball plate are arranged horizontally from top to bottom and are connected and supported by the plurality of vertical support rods, an air bag and a gas supply assembly are arranged at the upper end of the ball plate, when the projector and the book materials are loaded in the carrying space as the placing cavity, the air bag is in a deflated state, the projector and the book materials are placed on the ball plate, the placing cavity is formed inside the spherical outer frame, after the projector and the book materials are loaded, the rotor assembly operates, reaches the designated place according to the registered time and place, takes out the projector and the book materials, installs the projector at the lower end of the lower magnetic seat I, at the same time, the air bag is filled with hydrogen or helium, the air bag starts to expand, after expanding to a certain extent, the inflation is stopped, the propaganda unmanned aerial vehicle is provided with buoyancy by the gas in the air bag and is in a suspended state, the operation of the rotor assembly is stopped, the cable is connected between the projector and the charging plug, the projector starts to work, after learning is completed, the rotor assembly operates, at the same time, the air in the air bag is discharged, the air bag gradually shrinks, then the projector and the cable are taken off, the related book materials are taken back and placed in the placing cavity again, the propaganda unmanned aerial vehicle flies back to the display stand, after the book materials and the projector are put back to the original place, the propaganda unmanned aerial vehicle returns to the charging port for charging.

[0006] Preferably, the propaganda unmanned aerial vehicle further comprises a wind direction adjusting assembly, the wind direction adjusting assembly is rotationally arranged in the top horizontal ring, the wind direction adjusting assembly comprises a rotating round frame, an upper winding cloth roller, a flexible cloth, a lower vertical rod group, a left winding cable and a right winding cable, the rotating round frame is rotationally arranged at the inner side of the top horizontal ring, the flexible cloth is wound on the upper winding cloth roller, and the lower end of the flexible cloth is fixedly arranged at the middle of the lower vertical rod group, the left winding cable and the right winding cable are arranged at the lower end of the rotating round frame, the ends of the left winding cable and the right winding cable are respectively connected to the two sides of the lower vertical rod group, and the length of the flexible cloth extending out can be controlled by controlling the elongation and shortening of the left winding cable and the right winding cable.

[0007] Preferably, a return torsion spring is arranged between the upper cloth winding roller and the top transverse ring, the left winding cable and the right winding cable are structurally identical, each comprising a winding drum and a cable, the cable is wound on the winding drum, the end of the cable is connected with the group of downward rods, the gravity of the group of downward rods can straighten the flexible cloth, when it is needed to unfold the flexible cloth, the left winding cable and the right winding cable are driven to be elongated, the flexible cloth is pulled out by the gravity of the group of downward rods, at the same time, the return torsion spring is twisted to store the restoring force, after being pulled out to the position, the left winding cable and the right winding cable stop working, when it is needed to wind up the flexible cloth, the left winding cable and the right winding cable are driven to be retracted, the return torsion spring releases the stored restoring force to drive the flexible cloth to be wound up.

[0008] Preferably, the group of downward rods comprises a main rod and left and right telescopic rods which are arranged at both ends of the main rod in a telescopic manner, the left and right telescopic rods can be actively telescoped, the left and right telescopic rods are extended when the flexible cloth is elongated and can be clamped into the lower end of the intermediate transverse ring to fix the flexible cloth, a rotary driving power source is arranged between the top transverse ring and the rotary round frame, and a wind sensor is arranged at the spherical outer frame, which can detect the size and direction of the wind, when the wind direction is detected to be the same as the advancing direction of the propaganda unmanned aerial vehicle, the flexible cloth is extended, and the left and right telescopic rods are clamped into the lower end of the intermediate transverse ring, when it is needed to turn the propaganda unmanned aerial vehicle, the rotary round frame can be driven to rotate relative to the top transverse ring, so that the flexible cloth forms a spiral structure, thereby wind power can be used to form a turning force.

[0009] Preferably, the rotary round frame comprises a rotary ring body and sliding hinge bases one and two arranged at the lower end of the rotary ring body, the lower end of the rotary ring body is provided with accommodating cavities one and two, the sliding hinge base one is slidingly arranged in the accommodating cavity one, and the sliding hinge base two is slidingly arranged in the accommodating cavity two, the sliding hinge base one and the sliding hinge base two are structurally identical, each comprising a bottom plate one and first and second supporting ears arranged on the bottom plate one, hinge holes are formed in the first and second supporting ears, the sliding hinge base one and the sliding hinge base two are slidingly arranged in the accommodating cavity one and the accommodating cavity two respectively, a first elastic member is arranged between the sliding hinge base one and the accommodating cavity one, a second elastic member is arranged between the sliding hinge base two and the accommodating cavity two, roller supporting holes one and two are formed in the inner side of the rotary ring body, the two ends of the upper cloth winding roller are rotatably arranged in the roller supporting holes one and two respectively, and the winding drum is rotatably arranged in the hinge hole.

[0010] Preferably, the show shelf is sequentially provided with a base, a side supporting wall and an upper show frame from bottom to top, the base and the side supporting wall form the book material placing area, the book pushing placing assembly is arranged on the side supporting wall, and the book pushing placing assembly comprises a plurality of pushing cylinders and a plurality of book pushing plates, the number of the pushing cylinders is same as that of the book pushing plates, the book pushing plates are arranged in parallel and close to each other, the pushing cylinders are used to drive the book pushing plates to extend and retract, so that the selection of the book material can be realized.

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

[0012] Preferably, the two propaganda unmanned planes are connected through a connecting assembly, the connecting assembly comprises a connecting rod one, a connecting rod two, an adjustable plate group connecting the connecting rod one and the connecting rod two, and a pushing rotor arranged on the adjustable plate group, one end of the connecting rod one is connected with one propaganda unmanned plane, the other end of the connecting rod one is connected with the adjustable plate group, one end of the connecting rod two is connected with the other propaganda unmanned plane, the other end of the connecting rod two is connected with the adjustable plate group, the adjustable plate group is rotatably connected with the connecting rod one and the connecting rod two, the adjustable plate group can adjust the inclination angle relative to the two propaganda unmanned planes, the connecting rod one and the connecting rod two are respectively connected to two sides of the adjustable plate group, the pushing rotor is arranged on the rear side of the adjustable plate group, and the projector is installed on the upper end of the adjustable plate group when projecting.

[0013] Preferably, the propaganda unmanned plane further comprises a wind direction adjusting assembly, the wind direction adjusting assembly is rotatably arranged in the top horizontal ring, the wind direction adjusting assembly comprises a rotating round frame, an upper winding cloth roller, a flexible cloth, a lower vertical rod group, a winding and unwinding rope one and a winding and unwinding rope two, the rotating round frame is rotatably arranged on the inner side of the top horizontal ring, the flexible cloth is wound on the upper winding cloth roller, the lower end of the flexible cloth is fixedly arranged on the middle of the lower vertical rod group, the winding and unwinding rope one is arranged on one end of the lower vertical rod group and the lower end of the spherical outer frame, the winding and unwinding rope two is arranged on the other end of the lower vertical rod group and the lower end of the spherical outer frame, when the flexible cloth needs to be pulled out, the winding and unwinding rope one and the winding and unwinding rope two are retracted, and the upper winding cloth roller is in a winding state.

[0014] By using the technical scheme, the present application has the following advantages compared with the prior art:

[0015] 1. The display device of the present application, in addition to being able to passively display the display device, the state bar is arranged on the side of the propaganda column, the learning situation can be displayed through the state bar, the learning situation displayed in the state bar can be obtained, the learning object can select the learning time, the content, and the learning place can be sent to the display stand, after the display stand receives the learning related information, it can send the propaganda unmanned plane to transport the related learning materials and the projector with the propaganda content for learning, and after learning is completed, the learning situation is reported back to the display stand, and then the corresponding learning situation is updated through the state bar, so compared with the existing rotating material display device with passive propaganda, the function of supervision and transportation of learning materials can be increased;

[0016] 2. The propaganda unmanned plane of the present application is set to a hollow spherical frame structure with a placing cavity in order to cooperate with the propaganda, so the setting is not only able to serve as a loading space, but also considers that the influence of air flow will be small when flying at high altitude by adopting such a frame structure, and in addition, in order to enable the unmanned plane to be in a hovering state when the unmanned plane is performing projection operation, a gas bag structure is further arranged at the lower part of the spherical frame structure, the gas bag structure is in a retracted state when the unmanned plane is in a flying or transporting state, and is retracted at the bottom of the spherical frame structure, and when the unmanned plane arrives and the internal loaded goods are unloaded, it needs to hover for projection operation, the gas bag structure is filled with hydrogen or helium, so that the unmanned plane can be in a hovering state by using the gas bag, and at this time the rotor assembly can be in a stopped state, which can better save energy;

[0017] 3. The propaganda unmanned plane of the present application considers that the probability of encountering strong wind is relatively large when flying in the air, if the wind can be utilized, the flight speed and efficiency of the unmanned plane will be improved, so a wind direction adjusting assembly is further arranged on the unmanned plane, the wind direction adjusting assembly uses a flexible cloth which can be rolled up, the upper end and the lower end of the flexible cloth can be in a fixed state when the wind blows, so that the flexible cloth can be used to make the flight speed of the unmanned plane faster when the direction of the wind is the same as the driving direction of the unmanned plane;

[0018] 4. In addition, in order to enable the unmanned plane to rotate by utilizing wind power when rotating, the upper end of the wind direction adjusting assembly is relatively rotatable with the spherical frame, and the lower end of the wind direction adjusting assembly is in a relatively fixed state, so that the rotation of the upper end of the wind direction adjusting assembly can make the flexible cloth present a spiral cloth as a whole, the spiral cloth can guide the wind direction from one direction to another direction which is relatively clamped with the one direction, so as to quickly help the unmanned plane to make corresponding turns or even U-turns;

[0019] 5、Finally, the unmanned aerial vehicle of the present application can also be provided with two, two unmanned aerial vehicles can be connected through the connecting assembly, through this kind of setting, can make the transport data, so that the unmanned aerial vehicle and the book are placed in different unmanned aerial vehicle placing cavity, avoid the mutual collision between the book and the projector during transportation, cause the projector damaged, in addition, the use of two unmanned aerial vehicles, also can slow down the single unmanned aerial vehicle transport bearing, also can make the projector seat set between two unmanned aerial vehicles, when the projector needs to adjust the position, can adjust the left and right horizontal inclination degree of the projector by controlling the different inflation degree of the air bag of two unmanned aerial vehicles, by adjusting the rotation angle of the first rotating ring sleeve and the second rotating ring sleeve, can adjust the front and back longitudinal inclination degree of the projector, so as to better adjust the projector. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 To show the structure of the device schematic diagram;

[0021] Figure 2 For Figure 1 A-A sectional view of;

[0022] Figure 3 For the first embodiment of the promotional unmanned aerial vehicle structure schematic diagram;

[0023] Figure 4 For Figure 3 Enlarged view B and enlarged view C of;

[0024] Figure 5 For the promotional unmanned aerial vehicle structure schematic diagram when the wind direction adjusting assembly is expanded;

[0025] Figure 6 For the structure schematic diagram of rotating round frame;

[0026] Figure 7 For Figure 6 Enlarged view E and enlarged view F of;

[0027] Figure 8 For the first embodiment of the promotional unmanned aerial vehicle in projection state;

[0028] Figure 9 For the second embodiment of the promotional unmanned aerial vehicle structure schematic diagram;

[0029] Figure 10 For the structure schematic diagram of connecting assembly;

[0030] Figure 11 For the second embodiment of the promotional unmanned aerial vehicle in projection state;

[0031] Figure 12 For the structure schematic diagram of another embodiment of the wind direction adjusting assembly.

[0032] 1, display stand; 2, bulletin board; 3, status bar; 4, book material placement area; 5, charging port one; 6, charging port two; 7, book push placement assembly; 8, propaganda unmanned aerial vehicle; 9, spherical outer frame assembly; 10, rotor assembly; 11, wind direction adjusting assembly; 12, placement cavity; 13, placement ball plate; 14, vertical support rod; 15, top horizontal ring; 16, middle horizontal ring; 17, rotating round frame; 18, upper winding cloth roller; 19, flexible cloth; 20, downward vertical rod group; 21, left winding cable; 22, right winding cable; 23, main rod; 24, left telescopic rod; 25, right telescopic rod; 26, book material; 27, projector; 28, lower magnetic seat one; 29, rotating ring body; 30, containing cavity one; 31, sliding hinge seat one; 32, sliding hinge seat two; 33, bottom plate one; 34, first supporting ear; 35, second supporting ear; 36, hinged hole; 37, roller support hole one; 38, roller support hole two; 39, air bag; 40, cable; 41, rotor support one; 42, rotor support two; 43, rotor support three; 44, rotor support four; 45, blade; 46, connecting assembly; 47, connecting rod one; 48, connecting rod two; 49, adjustable plate group; 50, push rotor; 51, support plate; 52, first rotating ring sleeve; 53, second rotating ring sleeve; 54, upper magnetic seat two; 55, wire passing hole; 56, rear rotating shaft; 57, base; 58, side support wall; 59, upper display frame; 60, book pushing plate; 61, pushing cylinder; 62, winding drum; 63, cable; 64, winding edge cloth one; 65, winding edge cloth two; 66, wire hole one; 67, wire hole two; 68, winding and unwinding rope one; 69, winding and unwinding rope two; 70, spherical outer frame; 71, containing cavity two. DETAILED DESCRIPTION

[0033] The application will be further described in conjunction with the following examples. However, the application is not limited to the following examples. The implementation conditions used in the examples can be further adjusted according to different specific requirements. The implementation conditions not mentioned are the conventional conditions in the industry. The technical features involved in each embodiment of the application can be combined with each other as long as they do not conflict with each other.

[0034] In the following, only certain example embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the embodiments of the application. Therefore, the drawings and the description are considered to be essentially exemplary rather than limiting.

[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. Example 1

[0037] like Figures 1-8 As shown, 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. Figure 1The display board 2 displays the publicity content, such as the drawing related publicity content, or can be set as an electronic display screen to display the publicity content. The status bar 3 is arranged at the side of the display board 2, and is used to display the learning situation of the content of the display board 2. If the learning object A has learned, the status bar 3 displays that the learning object A has learned at a certain place on a certain day. If there is still a learning object to be learned, the status bar 3 displays the reminding information, such as the learning object B has not learned, and please follow up the learning in time. The reminding information can be transmitted to the mobile phone or other mobile devices of the learning object B through the Internet or WeChat or APP. The learning object B can register the learning time, learning content and learning address and other information on the WeChat or APP. After receiving the registered information, the show stand 1 sends the registered information to the publicity unmanned plane 8. The publicity unmanned plane 8 flies from the top of the display board 2 to the book material placing area 4. The book pushing and placing assembly 7 at the rear end of the book placing area 4 acts to push the corresponding book material 26 into the placing cavity 12 of the publicity unmanned plane 8, and then the projector 27 is also placed into the placing cavity 12 (such as manually taking out, or the projector 27 can be placed in the book material placing area 4 in advance, and is pushed into the placing cavity 12 by the action of the book pushing and placing assembly). The publicity unmanned plane 8 comprises a spherical outer frame assembly 9 and a rotor assembly 10. The rotor assembly 10 is arranged at the upper end of the spherical outer frame assembly 9 and is used to provide power for the flight. The spherical outer frame assembly 9 comprises a spherical outer frame 70, a lower magnetic suction seat 28, a top horizontal ring 15, a middle horizontal ring 16, a placing ball plate 13 and a plurality of vertical supporting rods 14. The top horizontal ring 15, the middle horizontal ring 16 and the placing ball plate 13 are arranged horizontally from top to bottom and are connected and supported by the plurality of vertical supporting rods 14. An air bag 39 and a corresponding air supply assembly (not shown in the figure, as long as the air supply assembly can supply air to the air bag 39, the specific air supply assembly is the common knowledge in the art, and will not be described here, and the gas provided by the air supply assembly into the air bag 39 can be hydrogen or helium) are arranged at the upper end of the placing ball plate 13. When the placing cavity 12 is loaded with the projector 27 and the book material 26 as a carrying space, the air bag 39 is in a no-air contraction state, and the projector 27 and the book material 26 are placed at the placing ball plate 13. The inside of the spherical outer frame 70 forms the placing cavity 12. After loading the projector 27 and the book material 26, the rotor assembly 10 acts to fly to the corresponding conference room or learning room according to the registered time and place. After the publicity unmanned plane 8 arrives, the arrival information is sent to the mobile phone or other mobile devices of the learning object B. After receiving the information, the learning object B arrives at the publicity unmanned plane 8 to take out the projector 27 and the book material 26, such as Figure 8As shown, the projector 27 is installed at the lower end of the lower magnetic seat 28, and the air bag 39 is filled with hydrogen or helium. When the air bag 39 is inflated to a certain extent, the inflation is stopped, and the propaganda unmanned aerial vehicle 8 is in a suspended state by the gas in the air bag 39. At this time, the action of the rotor assembly 10 can be stopped, and the cable 40 is connected between the projector 27 and the charging plug (not shown, which is a common charging plug). Thus, the cable 40 can provide power for the projector 27 and tether the propaganda unmanned aerial vehicle 8. The projector 27 starts to work and plays the pre-recorded or stored propaganda video or image or text. After learning, the propaganda unmanned aerial vehicle 8 records the learning object B, and then transmits the record to the status bar 3. The status bar 3 is updated to record that the learning object B has learned. Through the above-mentioned display device, the learning situation of each learning object can be mastered. When learning is needed, the learning object B can select the learning time, content and place, and then the display device can arrange the learning materials and related audio and video to the learning place, which ensures the safety of the materials and avoids the trouble of preparing the materials, and enables the propaganda work to be better carried out. After learning, the rotor assembly 10 works, and the air in the air bag 39 is discharged. The air bag 39 is gradually reduced, and then the projector 27 and the cable 40 are removed. The related book materials 26 are taken back and then placed in the placement cavity 12. After the book materials 26 and the projector 27 are returned to the original place, the propaganda unmanned aerial vehicle 8 returns to the charging port for charging.

[0038] In order to ensure that the propaganda information can be transmitted to the learning object, the follow-up learning reminder information can also be transmitted to the mobile phone or other mobile devices of the learning object through the Internet or WeChat or APP.

[0039] In addition, in order to ensure that the unmanned aerial vehicle can verify the integrity of the projector and the book materials, a camera can also be arranged on the propaganda unmanned aerial vehicle 8. When the projector and the book materials are detected to be placed back into the placement cavity 12, the camera is used to take pictures and compare with the pre-stored images. If the comparison is successful, it is returned. The propaganda unmanned aerial vehicle 8 starts to fly back to the display stand 1. If the projector or the book materials are missing, a prompt is sent. Until all the objects are returned, the propaganda unmanned aerial vehicle 8 starts to fly back to the display stand 1.

[0040] In addition, in order to facilitate the return of the book materials 26 and the projector 27 to the original position, a robot can be arranged on the display stand 1 or around the display stand 1. The mechanical hand of the robot returns the projector 27 and the book materials 26 to the original position. The specific structure of the robot is known in the art and is not the focus of the present application, which will not be described here.

[0041] As Figures 3-7As shown, the propaganda unmanned aerial vehicle 8 further comprises a wind direction adjusting assembly 11 rotatably arranged in the top horizontal ring 15, the wind direction adjusting assembly 11 comprising a rotating round frame 17, an upper cloth winding roller 18, a flexible cloth 19, a lower vertical rod set 20, a left winding cable 21 and a right winding cable 22, the rotating round frame 17 being rotatably arranged at the inner side of the top horizontal ring 15, the flexible cloth 19 being wound on the upper cloth winding roller 18, and the lower end of the flexible cloth 19 being fixedly arranged at the middle of the lower vertical rod set 20, the left winding cable 21 and the right winding cable 22 being arranged at the lower end of the rotating round frame 17, and the ends of the left winding cable 21 and the right winding cable 22 being respectively connected to the two sides of the lower vertical rod set 20, and the length of the flexible cloth 19 being controlled by controlling the extension and contraction of the left winding cable 21 and the right winding cable 22.

[0042] Further, a return torsion spring (not shown in the figure) is arranged between the upper cloth winding roller 18 and the top horizontal ring 15, the left winding cable 21 and the right winding cable 22 being the same in structure, and each comprising a winding drum 62 and a cable 63, the cable 63 being wound on the winding drum 62, and the end of the cable 63 being connected to the lower vertical rod set 20, the gravity of the lower vertical rod set 20 being able to straighten the flexible cloth 19, when it is needed to unfold the flexible cloth 19, the left winding cable 21 and the right winding cable 22 are lengthened, the flexible cloth 19 is pulled out by the gravity of the lower vertical rod set 20, and at the same time, the return torsion spring is 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 working, when it is needed to fold the flexible cloth 19, the left winding cable 21 and the right winding cable 22 are retracted, the return torsion spring releases the stored restoring force to drive the flexible cloth 19 to be retracted.

[0043] In order to make the wind direction adjusting assembly 11 better utilize the wind force to sail or turn, the drooping rod set 20 comprises a main rod 23 and left and right telescopic rods 24 and 25 which are telescopically arranged at both ends of the main rod 23, the left and right telescopic rods 24 and 25 can be actively telescoped by means of oil cylinders or telescopic cylinders, the left and right telescopic rods 24 and 25 are extended when the flexible cloth 19 is lengthened and can be clamped into the lower end of the middle transverse ring 16, thus the flexible cloth 19 can be fixed, a rotary driving power source is arranged between the top transverse ring 15 and the rotary round frame 17, the rotary driving power source can be arranged by means of a gear ring arranged on the outer periphery of the rotary round frame 17 and a driving motor with a driving gear arranged in the top transverse ring 15, the rotary driving power source drives the driving motor to rotate, thus driving the rotary round frame 17 to rotate, in addition, in order to cooperate with the action of the wind direction adjusting assembly 11, a wind force sensor (not shown in the figure, the specific structure is well known in the art and will not be described here) is arranged at the spherical outer frame 70, which can detect the size and direction of the wind force, when the wind direction is detected to be the same as the advancing direction of the propaganda unmanned aerial vehicle 8, the flexible cloth 19 is extended and the left and right telescopic rods 24 and 25 are clamped into the lower end of the middle transverse ring 16, at this time the flexible cloth 19 is equivalent to a sail, thus the propaganda unmanned aerial vehicle 8 can run faster and more power-savingly; in addition, if it is necessary to turn the propaganda unmanned aerial vehicle, the rotary round frame 17 can be driven to rotate relative to the top transverse ring 15, thus the flexible cloth 19 forms a spiral structure, thus a turning force can be formed by the wind force, thus the turning of the propaganda unmanned aerial vehicle 8 is more flexible and the running power can be saved, thus the running of the propaganda unmanned aerial vehicle 8 can be better controlled.

[0044] Further, as Figures 6-7As shown, the rotating frame 17 includes a rotating ring 29, a sliding hinge base one 31 and a sliding hinge base two 32 arranged at the lower end of the rotating ring 29, the lower end of the rotating ring 29 is provided with a receiving cavity one 30 and a receiving cavity two 71, the sliding hinge base one 31 is slidingly arranged in the receiving cavity one 30, the sliding hinge base two 32 is slidingly arranged in the receiving cavity two 71, the sliding hinge base one 31 and the sliding hinge base two 32 are the same in structure, each including a bottom plate one 33, a first supporting lug 34 and a second supporting lug 35 arranged on the bottom plate one 33, the first supporting lug 34 and the second supporting lug 35 are each provided with a hinge hole 36, the sliding hinge base one 31 and the sliding hinge base two 32 are slidingly arranged in the receiving cavity one 30 and the receiving cavity two 71 respectively, a first elastic member is arranged between the sliding hinge base one 31 and the receiving cavity one 30, a second elastic member is arranged between the sliding hinge base two 32 and the receiving cavity two 71, a roller supporting hole one 37 and a roller supporting hole two 38 are respectively arranged on the inner side of the rotating ring 29, the two ends of the upper winding roller 18 are respectively rotatably arranged in the roller supporting hole one 37 and the roller supporting hole two 38, the winding drum 62 is rotatably arranged in the hinge hole 36, in addition, the winding drum 62 and the upper winding roller 18 each include a rotating driving source, such as a rotating motor (not shown in the figure, the specific driving source structure is well known in the art, and is not the focus of the present application, so it will not be described again).

[0045] In addition, as shown in the figure, Figure 8 As shown, the rotor assembly 10 includes a rotor support one 41, a rotor support two 42, a rotor support three 43, a rotor support four 44 arranged on the top horizontal ring 15, and a blade 45 arranged on the rotor support one 41, the rotor support two 42, the rotor support three 43, and the rotor support four 44, the blade 45 can be rotated by arranging a separate driving motor, which is well known in the art, and the specific driving motor structure will not be described again.

[0046] In addition, the lower magnetic seat one 28 can be provided with an electromagnetic base, and the upper end of the projector 27 is provided with a magnetic structure, such as a permanent magnet or an electromagnet. The electromagnet of the lower magnetic seat one 28 is in a power-off state in normal circumstances, and is charged when the projector needs to be placed, so that the projector 27 can be attracted to project. In addition, the specific combination mode of the projector and the lower magnetic seat one can be a detachable mechanical connection mode such as pin connection, hook connection, etc. The specific mechanical connection mode is well known in the art, and will not be described here.

[0047] As shown in Figure 1 The display stand 1 is sequentially provided with a base 57, a side supporting wall 58 and an upper display frame 59 from bottom to top, the base 57 and the side supporting wall 58 form the book material placing area 4, and the book pushing assembly 7 is arranged on the side supporting wall 58 and includes a plurality of pushing cylinders 61 and a plurality of book pushing plates 60. The number of the pushing cylinders 61 is the same as that of the book pushing plates 60, and the book pushing plates 60 are arranged side by side. The pushing cylinders 61 are used to drive the book pushing plates 60 to extend or retract, so that the selection of the book material 26 can be realized.

[0048] As shown in Figure 1 The charging port includes a charging port one 5 and a charging port two 6, which are used to charge the propaganda unmanned aerial vehicle 8.

[0049] In addition, the drawing does not show that the side of the spherical outer frame 70 is provided with an opening and closing door. The opening and closing door can be provided with a part of the vertical supporting rod 14 and the middle horizontal ring 16 as a door structure, and then a gas cylinder or an oil cylinder is used to realize the opening and closing of the door structure. The specific opening and closing door structure is well known in the art. As long as the opening and closing of the placing cavity 12 can be realized, the book material and the projector can be put into the placing cavity 12 or taken out of the placing cavity 12. Therefore, the specific opening and closing door structure is not the focus of the present application, and will not be described here. In addition to the sliding door structure, the opening and closing door can also be a sliding door, a hinged door, etc. Embodiment 2

[0050] As shown in the accompanying Figures 9-11 The main difference between embodiment 2 and embodiment 1 is that the number of the propaganda unmanned aerial vehicle 8 in embodiment 2 is 2, and they are connected through the connecting assembly 46. In addition, the magnetic seat in embodiment 2 is placed on the connecting assembly 46, instead of being placed at the lower end of the spherical outer frame 70. Specifically,

[0051] Two propaganda unmanned aerial vehicles 8 are connected through a connecting assembly 46, which comprises a connecting rod one 47, a connecting rod two 48, an adjustable plate set 49 connecting the connecting rod one 47 and the connecting rod two 48, and a pushing rotor 50 arranged on the adjustable plate set 49. One end of the connecting rod one 47 is connected with one propaganda unmanned aerial vehicle 8, and the other end is connected with the adjustable plate set 49. One end of the connecting rod two 48 is connected with the other propaganda unmanned aerial vehicle 8, and the other end is connected with the adjustable plate set 49. The adjustable plate set 49 is rotatably connected with the connecting rod one 47 and the connecting rod two 48. The adjustable plate set 49 can adjust the inclination angle relative to the two propaganda unmanned aerial vehicles 8. The connecting rod one 47 and the connecting rod two 48 are respectively connected to the two sides of the adjustable plate set 49. The pushing rotor 50 is arranged on the rear side of the adjustable plate set 49. The projector 27 is installed on the upper end of the adjustable plate set 49 when projecting.

[0052] As shown in Figure 10 The adjustable plate set 49 comprises a supporting plate 51, a first rotating ring 52 and a second rotating ring 53 fixedly arranged on the two sides of the supporting plate 51, an upper magnetic seat two 54 fixedly arranged on the upper end of the supporting plate 51, and a rear rotating shaft 56 fixedly arranged on the rear side of the supporting plate 51. The pushing rotor 50 is arranged on the rear rotating shaft 56. In addition, a wire hole 55 is formed in the supporting plate 51.

[0053] One end of the connecting rod one 47 extends into the first rotating ring 52, and the connecting rod two 48 extends into the second rotating ring 53. Rotating drive device one and rotating drive device two are respectively arranged in the first rotating ring 52 and the second rotating ring 53. The rotating drive device one and the rotating drive device two each comprise a rotating drive motor. Drive gear rings are arranged on the outer periphery of the connecting rod two 48 and the connecting rod one 47. The rotating drive motor rotates to drive the drive gear rings to rotate, thereby adjusting the angle of the adjustable plate set 49 and adjusting the projection angle of the projector.

[0054] When projecting, the projector 27 is arranged on the upper magnetic seat two 54. A magnetic attraction structure such as an electromagnet or a permanent magnet is arranged on the lower end of the projector. An electromagnet is arranged in the upper magnetic seat two 54. When the projector needs to be fixed, the electromagnet in the upper magnetic seat two 54 is electrified to generate a magnetic force, thereby fixing the projector.

[0055] 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. Example 3

[0056] In addition, the only difference from Embodiment 1 and Embodiment 2 is the structure of the specific wind direction adjustment component 11, which is as follows:

[0057] like Figure 12 As shown, 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.

[0058] 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.

[0059] 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.

[0060] When the flexible cloth 19 needs to be retracted, the left telescopic rod 24 and the right telescopic rod 25 are retracted, and at the same time, the upper cloth winding roller 18 winds the flexible cloth 19, and the rope releasing rope one 68 and the rope releasing rope two 69 are in the state of releasing the rope.

[0061] In order to facilitate the person skilled in the art to understand the working principle of the propaganda unmanned aerial vehicle, the action process of the propaganda unmanned aerial vehicle will be described as follows: after the propaganda unmanned aerial vehicle 8 receives the instruction of the learning object, the propaganda unmanned aerial vehicle 8 flies down from the upper end of the display stand 1, and then pushes the cylinder 61 to act according to the data used by the learning object this time, selects the book material corresponding to the book pushing plate 60, and makes the door structure of the propaganda unmanned aerial vehicle 8 in the open state, the outwardly moving book pushing plate 60 pushes the book material to the upper end of the ball plate 13 through the door structure, at this time, the air bag 39 at the upper end of the ball plate 13 is in the retracted state, and the air bag 39 can still play a role in buffering and shock absorption, after the book material is rotated, the projector is pushed by the book pushing plate 60 corresponding to the position, enters the placement cavity 12 through the door structure, and after being contained, the door structure is in the closed state, the propaganda unmanned aerial vehicle 8 plans flight according to the selected learning time and learning place of the terminal, if the wind direction sensor detects that the wind blowing direction is the same as the unmanned aerial vehicle flying direction, the flexible cloth of the wind direction adjusting assembly 11 is in the unfolded state, the flexible cloth is used as a sail, and the unmanned aerial vehicle flies more quickly and more energy-savingly with the help of wind power; after arriving at the specified place, the projector and the book material are taken out by personnel, the projector is installed, and then the air bag 39 is in the inflated state, finally the inflation of the air bag 39 provides the power for the hovering of the propaganda unmanned aerial vehicle 8, the rotation speed of the rotor assembly 10 is gradually reduced, until the rotor assembly 10 is completely in the stopped state when the propaganda unmanned aerial vehicle 8 is in the hovering state, after the power cord is plugged in, the power cord supplies power and can tether the propaganda unmanned aerial vehicle 8, after being powered on, the projector works, so that the content on the propaganda column 2 can be output through projection, for relevant personnel to learn, and after the learning is completed, the propaganda unmanned aerial vehicle 8 can send the learning completion state to the state bar 3 at the same time, and the state bar 3 updates accordingly, so that the learning situation of each learning object can be understood overall and comprehensively. After the relevant personnel complete the learning, the personnel put the book material and the projector into the propaganda unmanned aerial vehicle 8, the propaganda unmanned aerial vehicle 8 flies back to the display stand 1 again, at the same time, the robot puts the book material and the projector back to the original position, the propaganda unmanned aerial vehicle 8 returns to charge, and completes a field propaganda work.

Claims

1. A display device for promoting comprising: Display stand (1), bulletin board (2), status bar (3) and book material placement area (4), bulletin board (2) and status bar (3) are arranged at the upper end of display stand (1), book material placement area (4) is arranged at the lower end of display stand (1), characterized by: a plurality of charging ports are further arranged at the top end of display stand (1), the plurality of charging ports are used to be connected with propaganda unmanned plane (8), the propaganda unmanned plane (8) is parked at the top end of display stand (1), the bulletin board (2) is displayed with propaganda content, the status bar (3) is used to display the learning situation of each learning object about the content of bulletin board (2), if there is an unlearned situation, the status bar (3) generates prompt information for timely follow-up learning, the prompt information is transmitted to the learning object, the learning object registers learning time, learning content and learning address information, after display stand (1) receives the registered information, the registered information is sent to propaganda unmanned plane (8), propaganda unmanned plane (8) flies from the top end of bulletin board (2) to book material placement area (4), book pushing assembly (7) at the rear end of book material placement area (4) acts, pushes corresponding book material (26) into the placement cavity (12) of propaganda unmanned plane (8), then projector (27) is also placed into the placement cavity (12), after being transported to the designated place by propaganda unmanned plane (8), book material (26) and projector (27) are taken out to learn, after learning is completed, propaganda unmanned plane (8) sends learning completion condition to status bar (3), and status bar (3) displays updated learning situation.

2. A display apparatus for promoting in accordance with claim 1, wherein: The propaganda unmanned plane (8) comprises a spherical outer frame assembly (9) and a rotor assembly (10), the rotor assembly (10) is arranged at the upper end of the spherical outer frame assembly (9), the spherical outer frame assembly (9) comprises a spherical outer frame (70) and a lower magnetic seat (28), the spherical outer frame (70) comprises a top horizontal ring (15), a middle horizontal ring (16), a placing ball plate (13) and a plurality of vertical supporting rods (14), the top horizontal ring (15), the middle horizontal ring (16) and the placing ball plate (13) are arranged horizontally from top to bottom and are connected and supported by the plurality of vertical supporting rods (14), an air bag (39) and a gas supply assembly are arranged at the upper end of the placing ball plate (13), when the projector (27) and the book materials (26) are loaded in the placing cavity (12) as a carrying space, the air bag (39) is in a deflated state, the projector (27) and the book materials (26) are placed on the placing ball plate (13), the placing cavity (12) is formed in the spherical outer frame (70), after the projector (27) and the book materials (26) are loaded, the rotor assembly (10) is actuated, reaches the designated place according to the registered time and place, takes out the projector (27) and the book materials (26), installs the projector (27) at the lower end of the lower magnetic seat (28), at the same time, the air bag (39) is filled with hydrogen or helium, the air bag (39) starts to expand, after expanding to a certain extent, the air filling is stopped, the propaganda unmanned plane (8) is provided with buoyancy by the gas in the air bag (39) and is in a suspended state, the action of the rotor assembly (10) is stopped, the cable (40) is connected between the projector (27) and the charging plug, the projector (27) starts to work, after learning, the rotor assembly (10) is actuated, at the same time, the air in the air bag (39) is discharged, the air bag (39) is gradually reduced, then the projector (27) and the cable (40) are taken down, the related book materials (26) are taken back and are placed in the placing cavity (12) again, the propaganda unmanned plane (8) flies back to the display stand (1), after the book materials (26) and the projector (27) are placed back to the original place, the propaganda unmanned plane (8) returns to the charging port for charging.

3. A display apparatus for promoting in accordance with claim 2, wherein: The propaganda unmanned aerial vehicle (8) further comprises a wind direction adjusting assembly (11) rotatably arranged in the top horizontal ring (15), the wind direction adjusting assembly (11) comprising a rotating round frame (17), an upper cloth winding roller (18), a flexible cloth (19), a lower vertical rod group (20), a left winding cable (21) and a right winding cable (22), the rotating round frame (17) being rotatably arranged at the inner side of the top horizontal ring (15), the flexible cloth (19) being wound on the upper cloth winding roller (18), and the lower end of the flexible cloth (19) being fixedly arranged at the middle of the lower vertical rod group (20), the left winding cable (21) and the right winding cable (22) being arranged at the lower end of the rotating round frame (17), the ends of the left winding cable (21) and the right winding cable (22) being respectively connected to the two sides of the lower vertical rod group (20), and the length of the flexible cloth (19) extending out can be controlled by controlling the extension and shortening of the left winding cable (21) and the right winding cable (22).

4. A display apparatus for promoting in accordance with claim 3, wherein: A return torsion spring is arranged between the upper cloth winding roller (18) and the top horizontal ring (15), the left winding cable (21) and the right winding cable (22) are the same in structure, and each comprises a winding drum (62) and a cable (63), the cable (63) being wound on the winding drum (62), the end of the cable (63) being connected to the lower vertical rod group (20), the gravity of the lower vertical rod group (20) being capable of straightening the flexible cloth (19), when it is needed to unfold the flexible cloth (19), the left winding cable (21) and the right winding cable (22) are driven to be lengthened, the flexible cloth (19) is pulled out by the gravity of the lower vertical rod group (20), and 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 working, when it is needed to wind up the flexible cloth (19), the left winding cable (21) and the right winding cable (22) are driven to be retracted, the return torsion spring releases the stored restoring force, and drives the flexible cloth (19) to be retracted.

5. A display apparatus for promoting in accordance with claim 4, wherein: The drooping rod set (20) comprises a main rod (23) and left and right telescopic rods (24, 25) arranged at both ends of the main rod (23) in a telescopic manner, the left and right telescopic rods (24, 25) can be actively telescoped, the left and right telescopic rods (24, 25) can be clamped into the lower end of the middle transverse ring (16) when the flexible cloth (19) is elongated, and the flexible cloth (19) can be fixed, a rotary driving power source is arranged between the top transverse ring (15) and the rotary round frame (17), and a wind sensor is arranged at the spherical outer frame (70), which can detect the size and direction of the wind, when the wind direction is the same as the advancing direction of the propaganda unmanned aerial vehicle (8), the flexible cloth (19) is stretched out, and the left and right telescopic rods (24, 25) are clamped into the lower end of the middle transverse ring (16), when the propaganda unmanned aerial vehicle needs to turn, the rotary round frame (17) can be driven to rotate relative to the top transverse ring (15), so that the flexible cloth (19) forms a spiral structure, and a turning force can be formed by wind power.

6. A display apparatus for promoting in accordance with claim 5, wherein: The rotary round frame (17) comprises a rotary ring body (29), a sliding hinge base one (31) and a sliding hinge base two (32) arranged at the lower end of the rotary ring body (29), the lower end of the rotary ring body (29) is provided with a containing cavity one (30) and a containing cavity two (71), the sliding hinge base one (31) is slidably arranged in the containing cavity one (30), and the sliding hinge base two (32) is slidably arranged in the containing cavity two (71), the sliding hinge base one (31) and the sliding hinge base two (32) are the same in structure and each comprise a bottom plate one (33), a first supporting lug (34) and a second supporting lug (35) arranged on the bottom plate one (33), a hinge hole (36) is formed in each of the first supporting lug (34) and the second supporting lug (35), the sliding hinge base one (31) and the sliding hinge base two (32) are slidably arranged in the containing cavity one (30) and the containing cavity two (71) respectively, a first elastic member is arranged between the sliding hinge base one (31) and the containing cavity one (30), a second elastic member is arranged between the sliding hinge base two (32) and the containing cavity two (71), a roller supporting hole one (37) and a roller supporting hole two (38) are formed in the inner side of the rotary ring body (29) respectively, both ends of the upper winding cloth roller (18) are rotatably arranged in the roller supporting hole one (37) and the roller supporting hole two (38) respectively, and the winding drum (62) is rotatably arranged in the hinge hole (36).

7. A display apparatus for promoting in accordance with claim 6, wherein: The show shelf (1) is sequentially provided with a base (57), a side supporting wall (58) and an upper show frame (59) from bottom to top, the base (57) and the side supporting wall (58) form the book material placing area (4), the book pushing placing assembly (7) is arranged on the side supporting wall (58) and comprises a plurality of pushing cylinders (61) and a plurality of book pushing plates (60), the pushing cylinders (61) and the book pushing plates (60) are in the same number, the book pushing plates (60) are arranged in parallel and close to each other, the pushing cylinders (61) are retracted and extended to drive the book pushing plates (60) to be retracted and extended, so that the selection of the book material (26) can be realized.

8. A display apparatus for promoting in accordance with any one of claims 2 to 7, wherein: An opening and closing door is arranged on one side of the spherical outer frame (70).

9. A display apparatus for promoting in accordance with claim 2, wherein: The two propaganda unmanned planes (8) are connected through the connecting assembly (46), the connecting assembly (46) comprises a connecting rod one (47), a connecting rod two (48), an adjustable plate group (49) connecting the connecting rod one (47) and the connecting rod two (48) and a pushing rotor (50) arranged on the adjustable plate group (49), one end of the connecting rod one (47) is connected with one propaganda unmanned plane (8), the other end is connected with the adjustable plate group (49); one end of the connecting rod two (48) is connected with the other propaganda unmanned plane (8), the other end is connected with the adjustable plate group (49), the adjustable plate group (49) and the connecting rod one (47) are rotatably connected, the adjustable plate group (49) and the connecting rod two (48) are also rotatably connected, the adjustable plate group (49) can adjust the inclination angle relative to the two propaganda unmanned planes (8), the connecting rod one (47) and the connecting rod two (48) are respectively connected on the two sides of the adjustable plate group (49), the pushing rotor (50) is arranged on the rear side of the adjustable plate group (49), the projector (27) is installed on the upper end of the adjustable plate group (49) when projecting.

10. A display device for promoting in accordance with claim 2 or 9, wherein: The propaganda unmanned plane (8) further comprises a wind direction adjusting assembly (11), the wind direction adjusting assembly (11) is rotatably arranged in the top horizontal ring (15), the wind direction adjusting assembly (11) comprises a rotating round frame (17), an upper winding cloth roller (18), a flexible cloth (19), a lower vertical rod group (20), a winding and unwinding rope one (68) and a winding and unwinding rope two (69), the rotating round frame (17) is rotatably arranged on the inner side of the top horizontal ring (15), the flexible cloth (19) is wound on the upper winding cloth roller (18), and the lower end of the flexible cloth (19) is fixedly arranged on the middle of the lower vertical rod group (20), the winding and unwinding rope one (68) is arranged on one end of the lower vertical rod group (20) and the lower end of the spherical outer frame (70), the winding and unwinding rope two (69) is arranged on the other end of the lower vertical rod group (20) and the lower end of the spherical outer frame (70), when the flexible cloth (19) needs to be pulled out, the winding and unwinding rope one (68) and the winding and unwinding rope two (69) are retracted, and the upper winding cloth roller (18) is in the unwinding state.

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