Holographic projection air imaging device

Abstract

The invention discloses a holographic projection air imaging device, and relates to the field of holographic projection devices.The holographic projection air imaging device comprises a cabinet, a touch display screen is fixed to the front side of the cabinet, universal wheels are fixed to the four corners of the bottom of the cabinet, and two supporting arms are symmetrically and rotationally connected to the front side of the top face of the cabinet through damping rotating shafts; the upper ends of the two support arms are rotationally connected with an upper cover through a damping rotating shaft; the foldable Z-shaped structure is adopted, the equipment size is reduced, and transportation and storage are convenient. After folding, the jet plate automatically cleans the projection film and the screen to avoid damage; the projection film is quickly disassembled and assembled through the horizontal plugging design in cooperation with the mounting strips / grooves and the limiting columns; the second rotating shaft linkage brush body automatically cleans a coarse filter screen of the air filter during folding, impurities are intercepted, the service life of a filter element is prolonged, air permeability is kept, and manual maintenance is reduced. And an integrated solution of efficient self-cleaning and convenient maintenance is integrally realized.

Description

Technical Field

[0001] The present invention relates to the field of holographic projection devices, and particularly to a holographic projection air imaging device. Background Art

[0002] Traditional holographic projection devices have two structural forms. One is that the projection medium is in a pyramid shape, and four display screens project towards the pyramid projection film structure on the bottom surface or the top surface, forming images on the four sides of the pyramid projection film. The other is a Z-shaped structure, which consists of a cabinet, an inclined arm, a projection film, and a top projection display screen. The light is reflected by the projection film to form a suspended image. However, most of the existing Z-shaped structures are fixed designs and cannot be folded, resulting in large device volume and inconvenient transportation and storage. In addition, the projection film is easily contaminated with dust when exposed for a long time. If wiped manually, it is easy to damage the surface of the acrylic projection film, and it is inconvenient to wipe the inclined projection film, resulting in low cleaning efficiency. Summary of the Invention

[0003] In order to make up for the deficiencies of the prior art, the purpose of the present invention is to provide a holographic projection air imaging device, which solves the problems that the arms of the existing Z-shaped holographic projection device cannot be folded, resulting in inconvenient storage and transportation of the device and inconvenient cleaning of the projection film.

[0004] In order to solve the problems of the prior art, the technical solution of the present invention is as follows: A holographic projection air imaging device includes a cabinet. Two arms are symmetrically connected to the top of the cabinet through damping rotating shafts. The upper ends of the arms are connected to an upper cover through damping rotating shafts. A projection display screen is provided on the bottom surface of the upper cover. A transparent projection film is detachably installed between the two arms; The arms and the top surface of the cabinet, and the upper cover and the arms form a Z-shaped projection structure when unfolded. In the folded state, the arms and the upper cover are horizontally stacked, and together with the projection film and the top surface of the cabinet, they enclose two front and rear open channels arranged up and down; A cleaning component is provided on the top plate of the cabinet. When folded, the cleaning component sprays air into the channels to clean the projection film and the projection display screen.

[0005] Optionally, the cleaning component includes a jet plate slidably arranged on the front side of the top plate of the cabinet through a sliding hole. A plurality of rows of jet ports are provided on the rear side of the jet plate. When the arms and the upper cover are folded, the jet plate moves upward and protrudes from the top surface of the cabinet. The jet ports are respectively oriented towards the projection display screen and both sides of the projection film. By using the jet plate and the multi-layer jet ports, the surface of the projection film and the projection display screen can be cleaned in the folded state, blowing away the surface dust and ensuring better clarity all the time.

[0006] Optionally, a rack is symmetrically fixed to the bottom of the jet plate, a slider is fixed to the side of the rack away from the second rotating shaft, a slide rail is fixed to the position of the slider on the inner wall of the cabinet, the slider is slidably connected to the outer wall of the slide rail, the rack is slidably connected to the inner wall of the cabinet, and the second rotating shaft is rotatably installed on the inner wall of the cabinet, and driving gears are fixed at both ends of the second rotating shaft, and the two driving gears respectively mesh with the two racks. The driving gears are linked to the folding action of the support arm and the upper cover, and the jet plate is driven to move down and hide in the cabinet when unfolded.

[0007] Optionally, driven synchronous pulleys are fixed at both ends of the second rotating shaft, a driving synchronous pulley is fixed at one end of the support arm close to the damping rotating shaft, the axis of the driving synchronous pulley coincides with the axis of the damping rotating shaft, a synchronous belt is connected between the driven synchronous pulley and the driving synchronous pulley on the same side, and the synchronous belt passes through the top plate through an opening on the top plate of the cabinet.

[0008] Optionally, an air pump is fixed to the inner wall of the cabinet, an air filter is fixed to the air inlet end of the air pump, the air outlet end of the air pump is connected to the air inlet of the jet plate through a hose, and a coarse filter is installed at the air inlet of the air filter. The air filter can be used to filter the air blown toward the surface of the projection film and the projection display screen, thereby ensuring the cleanliness of the clean air and avoiding secondary soiling of the projection film and the projection display screen. The setting of the coarse filter can effectively block large-volume and large-particle impurities and avoid these impurities clogging the filter cotton in the air filter.

[0009] Optionally, a brush is fixed to the outer wall of the second rotating shaft, the coarse filter screen is facing the outer wall of the second rotating shaft, the bristles of the brush are facing one side of the coarse filter screen, and the coarse filter screen is arranged in an arc shape. During the rotation of the second rotating shaft, the bristles of the brush brush the concave surface of the coarse filter screen, and the brush rotates with the rotation of the second rotating shaft, so that during the folding and unfolding of the support arm, the surface of the coarse filter screen can be synchronously driven to brush, so that the coarse filter screen will not be blocked by impurities, thereby ensuring good gas permeability of the air filter.

[0010] Optionally, mounting strips are fixed on both sides of the projection film, mounting grooves are opened on opposite sides of the two arms, the mounting strips are inserted into the mounting grooves, and the front side of the mounting grooves is closed and the rear side of the mounting grooves is open, the mounting strips are limited in the mounting grooves by limiting components, and the mounting grooves and the mounting strips are used to realize the connection between the projection film and the arms, and the foldable arms also reduce the tediousness of disassembling and assembling the projection film, and workers only need to plug and unplug horizontally to complete the disassembly of the projection film.

[0011] Optionally, the limiting component includes a side sliding groove formed in the inner wall of the installation groove. The side sliding groove penetrates the support arm, and a limiting column is inserted into the side sliding groove. One end of the limiting column is hemispherical, and the other end is outside the support arm. A spring is sleeved on the end of the limiting column located outside the support arm. One end of the spring is fixed to the limiting column, and the other end is fixed to the outer wall of the support arm. A limiting groove is formed in the outer wall of the installation strip, and the hemispherical end of the limiting column abuts in the limiting groove.

[0012] Compared with the prior art, the advantages of the present invention are as follows: 1. By setting the Z-shaped structure of the entire projection device into a foldable structure form, the support arm and the upper cover can be folded into a horizontally stacked state in addition to the Z-shaped unfolded posture, thereby reducing the height of the entire projection device, improving the passability, being more conducive to transportation, reducing the occupied space during storage, and being more conducive to storage. More importantly, with the setting of the air jet plate, the upper cover, the support arm, the projection film, and the top surface of the cabinet can form two upper and lower channels after folding. Subsequently, the air jet plate blows air into the channels, which can perform the cleaning work on both sides of the projection display screen and the projection film without manual wiping. The cleaning is convenient and efficient, and it will not cause damage to the projection film. 2. By setting the support arm and the upper cover of the device into a foldable structure form, in the folded state, the height of the projection film is reduced and the posture is horizontal. With the cooperation of structures such as the installation strip, the installation groove, and the limiting column, the limiting work of the projection film is completed, and the projection film can be directly inserted and removed horizontally on the side of the cabinet, improving the convenience of disassembling and assembling the projection film.

[0013] 3. By installing a brush on the second rotating shaft and installing a coarse filter screen at the air inlet of the air filter, during each folding and unfolding process, the cleaning work of the coarse filter screen can be realized simultaneously. The setting of the coarse filter screen can prevent large-volume and large-particle impurities from entering the air filter and adhering to the internal filter cotton, extending its service life. The structure of the brush can ensure that the coarse filter screen is not adhered and blocked, and always has better gas passing performance. And this mechanically linked structure setting reduces the manual operation steps and does not require manual active cleaning, ensuring the timeliness of cleaning.

[0014] 4. By setting the Z-shaped structure of the projection device into a foldable structure form, when storing the device, folding the device not only reduces the storage space, but also because the projection film is wrapped by the upper cover, the support arm, the top surface of the cabinet, and the air jet plate on one side, the projection film is not directly exposed in the storage state, reducing the dust adhesion amount in the storage state and reducing the cleaning frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the projection display screen of the present invention.

[0017] Figure 3 This is a schematic diagram of the folded state of the present invention.

[0018] Figure 4 This is a schematic diagram of the installation groove structure of the present invention.

[0019] Figure 5 This is a schematic diagram of the side sliding groove structure of the present invention.

[0020] Figure 6 This is a schematic diagram of the air pump position structure of the present invention.

[0021] Figure 7 This is of the present invention Figure 6 Enlarged schematic diagram at position A.

[0022] Figure 8 This is a schematic diagram of the slide rail structure of the present invention.

[0023] Figure 9 This is a schematic diagram of the opening position of the present invention.

[0024] Figure 10 This is a schematic diagram of the structure of Embodiment II of the present invention.

[0025] Figure 11 This is of the present invention Figure 10 Enlarged schematic diagram at position B.

[0026] Figure 12 This is a schematic diagram of the air guide cover structure of the present invention.

[0027] Reference numerals: 1, cabinet; 2, touch display screen; 3, universal wheel; 4, support arm; 5, upper cover; 6, projection display screen; 7, projection film; 8, channel; 9, mounting strip; 10, mounting groove; 11, side sliding groove; 12, limiting post; 13, spring; 14, limiting groove; 15, jet plate; 16, jet port; 17, air pump; 18, hose; 19, air filter; 20, coarse filter screen; 21, rack; 22, second rotating shaft; 23, driving gear; 24, slider; 25, slide rail; 26, driving synchronous pulley; 27, driven synchronous pulley; 28, synchronous belt; 29, steel cable; 30, opening; 31, brush; 32, air guide cover. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0029] Embodiment 1, please refer to Figures 1 to 9, this embodiment provides a holographic projection air imaging device, including a cabinet 1, a touch display screen 2 is fixed on the front side of the cabinet 1, universal wheels 3 are fixed at the four corners of the bottom of the cabinet 1, and two support arms 4 are symmetrically rotatably connected through damping rotating shafts at the front side position of the top surface of the cabinet 1. The upper ends of the two support arms 4 are rotatably connected through a damping rotating shaft to an upper cover 5. The upper cover 5 is located directly above the cabinet 1 and is parallel to the top surface of the cabinet 1. A projection display screen 6 is fixed on the bottom surface of the upper cover 5. A projection film 7 is installed between the two support arms 4. The projection film 7 is made of a highly transparent acrylic plate and has better hardness. When in use, the support arm 4 is flipped so that the included angle between the support arm 4 and the top surface bracket of the cabinet 1 is 45 degrees, and it is also ensured that the upper cover 5 is flipped to form a 45-degree included angle with the support arm 4. Thus, when viewed from the front side of the cabinet 1 (the side facing the touch display screen 2), the upper cover 5, the support arm 4 and the top surface of the cabinet 1 form a Z-shaped structure. The included angle between the projection display screen 6 and the projection film 7 faces the front side of the cabinet 1, and the included angle between the support arm 4 and the top surface of the cabinet 1 faces the rear side of the cabinet 1. The stability among the three is ensured through the damping rotating shaft. The damping rotating shaft has a structure principle similar to the screen flipping structure of a laptop computer in daily applications, and its structure principle is prior art, so it will not be elaborated here. Then, the projection display screen 6 is turned on, and the displayed image is projected onto the front side of the inclined projection film 7. Thus, the audience viewing from the front side of the cabinet 1 can see the image projected onto the projection film 7. Due to the high transparency of the projection film 7, a holographic image suspended in the air is presented to the audience.

[0030] When not in use, the upper cover 5 and the support arm 4 can be folded on the top surface of the cabinet 1. After folding, both the support arm 4 and the upper cover 5 are horizontal. The upper cover 5 abuts against the top surface of the outer wall of the support arm 4, and the bottom surface of the support arm 4 abuts against the top surface of the cabinet 1. Thus, a channel 8 with open ends at both the front and rear is formed between the bottom surface of the upper cover 5, the support arms 4 on both sides, and the projection film 7. Also, a channel 8 with open ends at both the front and rear is formed between the projection film 7, the support arms 4 on both sides, and the top surface of the cabinet 1. At this time, since the height of the projection film 7 is reduced and it is in a horizontal posture, the replacement operation can be carried out more conveniently at a lower height and in a horizontal posture. For the connection between the projection film 7 and the support arm 4, it is completed through the mounting strip 9 and the mounting groove 10. Mounting grooves 10 are formed on the opposite side surfaces of the two support arms 4. Mounting strips 9 are fixed at both ends of the projection film 7. The mounting strip 9 is inserted into a corresponding mounting groove 10. One end of the mounting groove 10 close to the front side of the cabinet 1 is closed, and the end of the mounting groove 10 close to the rear side of the cabinet 1 is open. After the projection film 7 is in a horizontal state, the mounting strip 9 is pulled out from the rear side of the cabinet 1 to replace the projection film 7. When installing, the mounting strips 9 on both sides are inserted into the mounting grooves 10. To ensure positioning after insertion, side sliding grooves 11 are formed on the inner wall of the mounting groove 10. The side sliding grooves 11 penetrate through the support arm 4. A limiting post 12 is slidably inserted into the side sliding groove 11. One end of the limiting post 12 close to the mounting groove 10 is hemispherical and extends to the inner wall of the mounting groove 10. The end of the limiting post 12 away from its hemispherical end is outside the support arm 4 and is sleeved with a spring 13. One end of the spring 13 is fixed to the outer wall of the limiting post 12, and the other end is fixed to the outer wall of the support arm 4. A limiting groove 14 is formed on the outer wall of the mounting strip 9 at a position opposite to the limiting post 12. Under the elastic force of the spring 13, the hemispherical end of the limiting post 12 abuts in the limiting groove 14, thus realizing the positioning of the projection film 7. After the mounting strip 9 is pulled out, the hemispherical end of the limiting post 12 abuts against the inner wall of the end of the limiting groove 14 under the elastic force of the spring 13. Thus, the replacement of the projection film 7 can be completed by directly horizontal plugging and unplugging operations in the folded state. The replacement steps of the projection film 7 are greatly simplified compared with the traditional technology, and the operation convenience is improved.

[0031] The setting that the front side of the mounting groove 10 is closed and the rear side is open ensures that the projection film 7 can be stably in the mounting groove 10 and the mounting strip 9 cannot slip off from the lower end of the support arm 4 when the device is in the unfolded state.

[0032] When not in use, when the upper cover 5 and the support arm 4 are folded on the top surface of the cabinet 1, the replacement work of the projection film 7 is carried out when the set cycle arrives. The cleaning work can be carried out within the set cycle not yet reached. The upper channel 8 and the lower channel 8 are blown with clean air so that the airflow cleans the dust on both surfaces of the projection film 7 and the surface of the projection display screen 6. To achieve this effect, a jet plate 15 is slidably installed on the front side of the top plate of the cabinet 1 through a sliding hole. Three rows of jet nozzles 16 are arranged in sequence from top to bottom on the rear side of the jet plate 15. When the device is in the folded state, the jet plate 15 protrudes from the top surface of the cabinet 1, and the uppermost row of jet nozzles 16 faces the top wall of the upper channel 8, that is, faces the projection display screen 6. The middle row of jet nozzles 16 faces the bottom wall of the upper channel 8, that is, faces the top surface of the projection film 7. The lowermost row of jet nozzles 16 faces the top wall of the lower channel 8, that is, the top surface of the projection film 7. By driving the air pump 17 fixed on the inner wall of the cabinet 1 to suck air, the air enters the jet plate 15 through the hose 18 connecting the air outlet end of the air pump 17 and the air inlet of the jet plate 15, and then is simultaneously ejected from a plurality of jet nozzles 16 communicating with the air inlet of the jet plate 15. The high-pressure air blows the surface of the projection display screen 6 and the surface of the projection film 7 to achieve automatic cleaning and reduce the influence of dust on the projection clarity.

[0033] For the air entering the air pump 17, the work of filtering and cleaning the intake air is realized by fixing an air filter 19 at the intake end of the air pump 17, ensuring the cleanliness of the air blown onto the surface of the projection film 7 and the projection display screen 6. A coarse filter screen 20 is fixed at the air inlet of the air filter 19. The coarse filter screen 20 preliminarily filters large-volume impurities to avoid blocking the filter cotton inside the air filter 19 by large-volume impurities and ensuring the service life of the filter cotton of the air filter 19.

[0034] When the entire device is in an unfolded posture for projection display, the jet plate 15 needs to be lowered and hidden in the cabinet 1 to avoid affecting the imaging and viewing. Racks 21 are fixed at both ends of the bottom surface of the jet plate 15, and the second shaft 22 is rotatably installed at the upper end of the front side of the inner wall of the cabinet 1. Driving gears 23 are fixed at both ends of the second shaft 22. The driving gears 23 on both sides are respectively meshed and connected with the racks 21 on both sides, and a slider 24 is fixed on the side of the rack 21 away from the driving gear 23. A slide rail 25 is fixed on the inner wall of the front side of the cabinet 1 at the position of the slider 24, and the slider 24 is slidably installed on the outer wall of the slide rail 25, so that the jet plate 15 can slide in the slide hole along the longitudinal direction, and then can slide into the inner side of the cabinet 1 when the entire device is unfolded, ensuring that the top surface of the jet plate 15 is flush with the top surface of the cabinet 1, without affecting the normal viewing work. For the drive of the rotation of the second shaft 22, a support arm 4 is close to the damping shaft. The driving synchronous pulley 26 is fixed at the end, and the driving synchronous pulley 26 is sleeved on the outside of the damping shaft. The axis of the driving synchronous pulley 26 coincides with the axis of the damping shaft. Driven synchronous pulleys 27 are fixed at both ends of the second shaft 22. A synchronous belt 28 is connected between the driving synchronous pulley 26 and the driven synchronous pulley 27 that are opposite to each other. The synchronous belt 28 passes through the top plate of the cabinet 1 through an opening 30 on the top plate of the cabinet 1. When the device is changed from an unfolded posture to a folded posture, the support arm 4 flips downward, driving the driving synchronous pulley 26 to rotate, so that the driven synchronous pulley 27 rotates, and the transmission ratio of the driving synchronous pulley 26 to the driven synchronous pulley 27 is 1:1, so the synchronous rotation angles of the two are the same, and the rotation of the second shaft 22 drives the driving gear 23 to rotate, thereby driving the rack 21 to slide upward, and the jet plate 15 slides upward to protrude from the top surface of the cabinet 1, and when the device is unfolded, the jet plate 15 slides down and hides inside the cabinet 1.

[0035] The synchronous belt 28 may be a polyurethane synchronous belt 28 (PU synchronous belt 28), which is mainly made of thermoplastic polyurethane and has high wear resistance and strength. This type of synchronous belt 28 usually uses nylon wire or steel wire as a tensile layer, so it is relatively hard.

[0036] When the arm 4 is in the unfolded state, it is best to maintain an angle of 45 degrees with the top surface of the cabinet 1, and this angle can be limited by fixing a steel cable 29 between the arm 4 and the top surface of the cabinet 1. The 45-degree angle between the upper cover 5 and the arm 4 can also be limited by fixing a steel cable 29 between the arm 4 and the upper cover 5. That is, during the unfolding of the device, the upper cover 5 and the arm 4 are fully unfolded, and the angle between the upper cover 5 and the arm 4 and the angle between the arm 4 and the top surface of the cabinet 1 are both at 45 degrees. The steel cable 29 is set to limit the unfolding angle of the arm 4, and there is no need to manually adjust the angle of the arm 4 repeatedly. Expanding and tightening the steel cable 29 indicates that the angle is appropriate.

[0037] To avoid the situation where, in the folded state, the support arm 4, the upper cover 5, and the support arm 4 and the cabinet 1 clamp the cable 29, resulting in the inability to close both sides of the channel 8, the cable 29 can be arranged to be inclined from the end close to the support arm 4 towards the outside of the entire device, so as to prevent the cable 29 from being involuted into the space between the support arm 4 and the upper cover 5, and between the support arm 4 and the top surface of the cabinet 1 after folding.

[0038] Embodiment 2. Please refer to Figures 10 to 12 , this embodiment provides a further technical solution based on Embodiment 1. After long-term use, the coarse filter screen 20 will be covered and blocked by large-volume impurities, thereby hindering the intake air volume and causing the problem of insufficient blown air pressure. To solve this problem, a brush 31 is fixed on the outer wall of the second rotating shaft 22, and the bristles of the brush 31 face the intake end of the air pump 17. A funnel-shaped air guide cover 32 is fixed at the intake end of the air pump 17. The air guide cover 32 faces the outer wall of the second rotating shaft 22. The end of the air guide cover 32 and the coarse filter screen 20 are both arc-shaped. The brush 31 can brush across the surface of the coarse filter screen 20 during the rotation of the second rotating shaft 22, so that during the process of folding and unfolding the entire device, the large-volume impurities on the surface of the coarse filter screen 20 can be automatically removed synchronously.

[0039] In summary, the present invention realizes the reduction of the equipment height through the foldable Z-shaped structure design, improving the convenience of transportation and storage: in the folded state, the support arm 4, the upper cover 5 are horizontally stacked to form upper and lower dual channels 8, and the projection film 7 and the projection display screen are automatically cleaned on both sides by cooperating with the blowing of the air jet plate 15, avoiding damage caused by manual wiping; the projection film 7 adopts a horizontal plug-in disassembly and assembly structure, which is more convenient to replace in the folded state; innovatively, a linkage brush body is added to the second rotating shaft 22, and the coarse filter screen 20 at the air inlet of the air filter 19 is synchronously cleaned by using the mechanical movement of folding and unfolding the equipment. This not only effectively intercepts large-particle impurities and prolongs the service life of the filter element, but also ensures the air permeability of the filter screen through the self-cleaning mechanism, forming a comprehensive technical solution with structural linkage, convenient operation, and efficient maintenance.

[0040] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A holographic projection air imaging device, comprising a cabinet (1), characterized in that: The top of the cabinet (1) is symmetrically connected to two arms (4) via a damping shaft, the upper ends of the arms (4) are connected to an upper cover (5) via a damping shaft, a projection display screen (6) is provided on the bottom surface of the upper cover (5), and a transparent projection film (7) is detachably installed between the two arms (4); The support arm (4) and the top surface of the cabinet (1), the upper cover (5) and the support arm (4) are unfolded to form a Z-shaped projection structure; in a folded state, the support arm (4) and the upper cover (5) are horizontally stacked, and together with the projection film (7) and the top surface of the cabinet (1) form two vertically arranged front and rear open channels (8); A cleaning component is provided on the top plate of the cabinet (1); when folded, the cleaning component sprays air into the channel (8) to clean the projection film (7) and the projection display screen (6).

2. The holographic projection air imaging device according to claim 1, characterized in that: The cleaning component comprises an air jet plate (15) which is slidably arranged on the front side of the top plate of the cabinet (1) through a sliding hole, and a plurality of rows of air jet ports (16) are arranged on the rear side of the air jet plate (15). When the support arm (4) and the upper cover (5) are folded, the air jet plate (15) moves upward to protrude from the top surface of the cabinet (1), and the air jet ports (16) are respectively directed toward the projection display screen (6) and the two sides of the projection film (7).

3. The holographic projection air imaging device according to claim 2, characterized in that: A rack (21) is symmetrically fixed to the bottom of the jet panel (15), the rack (21) is slidably connected to the inner wall of the cabinet (1), a second rotating shaft (22) is rotatably mounted on the inner wall of the cabinet (1), both ends of the second rotating shaft (22) are fixed with driving gears (23), the two driving gears (23) respectively mesh with the two racks (21), the driving gears (23) are linked to the folding action of the support arm (4) and the upper cover (5), and when unfolded, the jet panel (15) is driven to move downward and hide in the cabinet (1).

4. The holographic projection air imaging device according to claim 3, characterized in that: A driven synchronous pulley (27) is fixed to both ends of the second rotating shaft (22); a driving synchronous pulley (26) is fixed to one end of the support arm (4) close to the damping rotating shaft; the axis of the driving synchronous pulley (26) coincides with the axis of the damping rotating shaft; a synchronous belt (28) is connected in transmission between the driven synchronous pulley (27) and the driving synchronous pulley (26) on the same side; the synchronous belt (28) passes through the top plate of the cabinet (1) through an opening (30) on the top plate.

5. The holographic projection air imaging device according to claim 3, characterized in that: A slide block (24) is fixed to the side of the rack (21) facing away from the second rotating shaft (22), a slide rail (25) is fixed to the inner wall of the cabinet (1) at a position corresponding to the slide block (24), and the slide block (24) is slidably connected to the outer wall of the slide rail (25).

6. The holographic projection air imaging device according to claim 3, characterized in that: An air pump (17) is fixed to the inner wall of the cabinet (1), an air filter (19) is fixed to the air inlet end of the air pump (17), an air outlet end of the air pump (17) is connected to the air inlet of the jet plate (15) via a hose (18), and a coarse filter (20) is installed at the air inlet of the air filter (19).

7. The holographic projection air imaging device according to claim 6, characterized in that: A brush (31) is fixed to the outer wall of the second rotating shaft (22); the coarse filter (20) faces the outer wall of the second rotating shaft (22); the bristles of the brush (31) face one side of the coarse filter (20); the coarse filter (20) is arranged in an arc shape; during the rotation of the second rotating shaft (22), the bristles of the brush (31) brush against the concave surface of the coarse filter (20).

8. The holographic projection air imaging device according to claim 1, characterized in that: Mounting strips (9) are fixed on both sides of the projection film (7), and mounting grooves (10) are provided on opposite sides of the two supporting arms (4). The mounting strips (9) are inserted into the mounting grooves (10), and the front side of the mounting grooves (10) is closed and the rear side is open. The mounting strips (9) are limited in the mounting grooves (10) by a limiting assembly.

9. The holographic projection air imaging device according to claim 8, characterized in that: The limiting assembly comprises a side slide groove (11) formed on the inner wall of the mounting groove (10), the side slide groove (11) passing through the support arm (4), a limiting column (12) inserted into the side slide groove (11), one end of the limiting column (12) being hemispherical, and the other end being located outside the support arm (4), a spring (13) being sleeved on the end of the limiting column (12) located outside the support arm (4), one end of the spring (13) being fixed to the limiting column (12), and the other end being fixed to the outer wall of the support arm (4), a limiting groove (14) being formed on the outer wall of the mounting strip (9), and the hemispherical end of the limiting column (12) abutting against the limiting groove (14).

Images