A video conferencing projection device and its projection method

Abstract

This invention discloses a video conferencing projection device and its projection method, relating to the field of projection technology. It includes an open box with a fixed plate at the bottom and a suspended lifting plate at the top. The fixed plate is connected to the lifting plate via a lifting mechanism. A balance disc is positioned directly above the lifting plate. A fixed shaft is inserted into the center of the bottom surface of the lifting plate. An inner sleeve is fitted onto the upper middle part of the fixed shaft, and an outer sleeve is fitted onto the center of the inner sleeve. The balance disc is connected to the fixed shaft, the inner sleeve, and the outer sleeve via a balancing mechanism. A hexagonal ring is fixed to the top surface of the balance disc, and a hexagonal base is located inside the hexagonal ring. A projector body is fixed to the center of the top surface of the hexagonal base, and the hexagonal ring is connected to the hexagonal base via a locking mechanism. This invention solves the problems of unstable projector fixation and inconvenient balance calibration. Furthermore, the overall structure is compact, increasing both the stability of the projector body installation and enhancing its balance.

Description

Technical Field

[0001] This invention relates to the field of projection technology, and more particularly to a video conferencing projection device and its projection method. Background Technology

[0002] With the improvement of security levels and the development of technology, the application of video terminal devices in emergency command centers is increasing. These devices require conference projectors to provide smooth and stable video quality, leading to a growing demand for high-quality emergency command center video terminal devices. Video conferencing refers to a meeting where people in two or more locations conduct face-to-face conversations through communication equipment and networks. Command center video conferencing requires a stable and secure network, reliable meeting quality, and a formal meeting environment, necessitating the use of professional video conferencing equipment and the establishment of a dedicated video conferencing system.

[0003] As disclosed in the Chinese Utility Model Appraisal, a projection device for video conferencing (Publication No.: CN213718092U) includes a protective box, a fixing structure, and a projector. Two first support tubes are fixedly installed inside the protective box, and each of the first support tubes is provided with a movable and adjustable second support tube. The top end of the second support tube is fixedly connected to a support base. A tightening nut is provided at the end of the first support tube. A fixing structure for limiting and fixing the projector is installed on the support base.

[0004] The following drawbacks exist: 1. After the staff places the projector on the projector stand, it is impossible to fix it securely, which may cause the projector to be damaged by collision when it is moved, affecting its normal use afterward; 2. Most projectors are fixed in the conference room. When there is an emergency meeting or a temporary conference room, the use of the projector is inconvenient, and the projector cannot be quickly balanced and calibrated, resulting in low flexibility of use. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as unstable projector fixation and inconvenient balance calibration, and to propose a video conferencing projection device and projection method thereof.

[0006] To address the problems of unstable projector mounting and inconvenient balance calibration in existing technologies, the present invention adopts the following technical solution:

[0007] A video conferencing projection device includes an open box, which is a rectangular box with an open top. A fixed plate is provided at the bottom of the open box, and an extension rod is provided at each of the four corners of the fixed plate. The outer end of each extension rod is fixed to the corner of the inner wall of the open box. A lifting plate is provided at the top of the open box and is suspended in the air. The fixed plate is connected to the lifting plate through a lifting mechanism.

[0008] A balance disc is provided directly above the lifting plate. A fixed shaft is inserted into the middle of the bottom surface of the lifting plate and is rotatably connected. An inner sleeve is fitted onto the upper middle part of the fixed shaft and an outer sleeve is fitted onto the middle part of the inner sleeve. The balance disc is connected to the fixed shaft, the inner sleeve, and the outer sleeve through a balancing mechanism.

[0009] A hexagonal ring is fixed on the top surface of the balance disc, and a hexagonal base is provided inside the hexagonal ring for engaging connection. The projector body is fixed in the middle of the top surface of the hexagonal base, and the hexagonal ring is connected to the hexagonal base through an engaging mechanism.

[0010] Preferably, the lifting mechanism includes a support swing arm and a lifting swing arm. Each of the four sides of the fixed plate is provided with a pair of support swing arms that are arranged in a "V" shape, staggered upwards and movably hinged. Each pair of support swing arms is provided with a pair of support connecting rods that are movably hinged in the middle at the top.

[0011] The lifting plate has a pair of lifting swing arms arranged in a "V" shape and staggered downwards at the center of each of its four sides. Each pair of lifting swing arms has a pair of lifting connecting rods that are movably hinged in the middle at the bottom end. The top end of each pair of supporting connecting rods is movably hinged to the bottom end of the corresponding pair of lifting connecting rods.

[0012] Preferably, an L-shaped bracket is fixedly provided at the center of each of the four sides of the bottom surface of the fixed plate, and a vertically penetrating and rotatably connected worm gear is inserted at the outer end of each L-shaped bracket, with the top end of each worm gear extending to the bottom end of the corresponding pair of support arms.

[0013] Each of the two supporting swing arms has a notched worm gear fixed at its bottom end. The two notched worm gears are symmetrically distributed on both sides of the worm, and the worm is meshed with the two notched worm gears.

[0014] Preferably, each worm gear has a concentrically fixed driven gear at its bottom end, and a circular through hole is opened in the middle of the bottom surface of the fixed plate. A first motor with its output end facing downward is fixed inside the circular through hole. A drive gear disk is concentrically fixed at the end of the motor shaft of the first motor, and the drive gear disk meshes with four driven gears.

[0015] Preferably, the balancing mechanism includes an L-shaped swing rod and an L-shaped swing arm. The outer ring surface of the balancing disc is provided with three staggered and movably hinged L-shaped swing rods. The top ends of the fixed shaft, inner sleeve, and outer sleeve are sequentially fixed with three staggered L-shaped swing arms. The outer end of each L-shaped swing arm is movably hinged to the bottom end of the corresponding L-shaped swing rod.

[0016] Preferably, the bottom end of the inner sleeve, the bottom end of the outer sleeve, and the middle of the fixed shaft are all fitted with concentrically fixed adjustment secondary gears, and the three adjustment secondary gears are stacked. The top surface of the lifting plate is fixed with three second motors arranged in a circle around the fixed shaft. The motor shaft end of each second motor is fitted with a concentrically fixed adjustment main gear. The three adjustment main gears are staggered at different heights, and each adjustment main gear is meshed with the corresponding adjustment secondary gear.

[0017] Preferably, the engaging mechanism includes limiting blocks, and six circularly distributed U-shaped sliding plates are fixed on the top surface of the hexagonal ring. Each U-shaped sliding plate has a slidably connected T-shaped slider engaged inside it. Each T-shaped slider has vertically distributed limiting blocks fixed on its inner sidewall. The outer side of the hexagonal base has six circularly distributed limiting slots, and the inner end of each limiting block is inserted into the corresponding limiting slot.

[0018] Preferably, the top surface of the hexagonal ring has six elliptical pin holes arranged in a circular pattern. The six elliptical pin holes and six U-shaped sliding plates are alternately distributed. Each elliptical pin hole has a slidingly connected limiting pin engaged inside. The top end of each limiting pin is fixed with a V-shaped sliding plate. The side wall thicknesses of each V-shaped sliding plate are staggered. A rectangular sliding hole is opened in the middle of the side wall of each T-shaped sliding plate. The opposite ends of an adjacent pair of V-shaped sliding plates are slidably inserted into the corresponding rectangular sliding holes.

[0019] Preferably, a circular groove is provided on the outer side of the balance disc, and an electrically controlled telescopic cylinder with the output end facing outward is fixed inside the circular groove. A telescopic connecting block is fixed at the end of the telescopic rod of the electrically controlled telescopic cylinder, and a telescopic connecting rod is fixed at the top of the telescopic connecting block. The inner end of the telescopic connecting rod is fixed to one of the T-shaped sliders. A rectangular top cover is provided on the top of the open box, and a circular protective cover is recessed upward on the inner top wall of the rectangular top cover. The projector body is located inside the circular protective cover, and rollers are provided at the four corners of the bottom surface of the open box.

[0020] The present invention also proposes a projection method for a video conferencing projection device, comprising the following steps:

[0021] Step 1: Open the rectangular top cover. Place the projector body and hexagonal base in the center of the hexagonal ring. Activate the electric telescopic cylinder. The telescopic rod of the electric telescopic cylinder shortens. Through the telescopic connecting block, it drives the telescopic connecting rod and a T-shaped slider to slide inward along the U-shaped slide plate. The T-shaped slider drives the adjacent pair of V-shaped slide plates to slide relative to each other, and drives the limit pin to slide inward along the elliptical pin hole. This drives the remaining T-shaped sliders to slide inward synchronously, so that the inner ends of the six limit blocks are all inserted into the corresponding limit slots, thus limiting and fixing the hexagonal base.

[0022] Step 2: Start the first motor. The motor shaft of the first motor drives the drive gear disk. The drive gear disk meshes and drives the driven gear and worm to rotate. The worm meshes and drives a pair of notched worm wheels to rotate relative to each other, which in turn drives each pair of support swing arms to close relative to each other. Then, through the cross hinge action of the support connecting rod and the lifting connecting rod, each pair of lifting swing arms is driven to close relative to each other, which in turn drives the lifting plate and balance plate to slowly rise.

[0023] Step 3: Start the projector. Under the projection of the projector, conduct a video conference. According to the projection position, start the three second motors. The motor shafts of the second motors drive the main gear to rotate within a small range. The main gear meshes and drives the corresponding auxiliary gear, inner sleeve, outer sleeve, and fixed shaft to rotate, which in turn drives the L-shaped swing arm to rotate synchronously. Then, the L-shaped swing rod drives the balance disc to adjust the balance, so that the balance disc and the projector body are in the position of direct projection.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. In this invention, through the cooperation of the locking mechanism, when the six T-shaped sliders slide inward synchronously, the inner ends of the six limiting blocks are all inserted into the corresponding limiting slots, thereby limiting and fixing the hexagonal base, which increases the stability of the projector body installation, protects the projector, can install various models of projectors, makes projector replacement more convenient, and improves practicality.

[0026] 2. In this invention, by using the lifting mechanism and the balancing mechanism in combination, and through the cross hinge of the support link and the lifting link in sequence, the lifting plate can raise the projector body to a suitable position, thereby adjusting the height of the projector. Then, through the hinge of the lifting plate and the L-shaped swing rod, the balance plate can be tilted to one side, so that the balance plate and the projector body maintain the position of positive projection, thereby enhancing the balance of the projector body and increasing the flexibility of the projector.

[0027] In summary, this invention solves the problems of unstable projector mounting and inconvenient balance calibration. Furthermore, its overall structural design is compact, which not only increases the stability of the projector installation but also enhances the balance of the projector body. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0029] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0030] Figure 2 This is a front view exploded view of the present invention;

[0031] Figure 3 This is a front sectional view of the present invention;

[0032] Figure 4 This is a schematic diagram showing the connection between the fixed plate and the lifting plate structure of the present invention;

[0033] Figure 5 For the present invention Figure 4 A diagram showing the view from below;

[0034] Figure 6 For the present invention Figure 4 An explosion diagram;

[0035] Figure 7 This is a schematic diagram showing the connection between the lifting plate and the balance disc structure of the present invention;

[0036] Figure 8 This is an exploded view of the lifting mechanism of the present invention;

[0037] Figure 9 This is an explosion diagram of the balancing mechanism of the present invention;

[0038] Figure 10 This is a schematic diagram showing the connection between the fixed shaft, inner sleeve, and outer sleeve of the present invention;

[0039] Figure 11 This is a schematic diagram showing the connection between the hexagonal ring and the projector body of the present invention;

[0040] Figure 12 For the present invention Figure 11 An explosion diagram;

[0041] Figure 13 This is an exploded view of the locking mechanism of the present invention;

[0042] The components in the diagram are numbered as follows: 1. Open box; 11. Fixed plate; 12. Support swing arm; 13. Support connecting rod; 14. Lifting connecting rod; 15. Lifting swing arm; 16. Notched worm gear; 17. Worm; 18. Driven gear; 19. First motor; 110. Drive gear disc; 2. Lifting plate; 21. Fixed shaft; 22. Inner sleeve; 23. Outer sleeve; 24. L-shaped swing rod; 25. L-shaped swing arm; 26. Adjusting auxiliary gear; 27. Second motor; 28. Adjusting main gear; 3. Balance disc; 31. Hexagonal ring; 32. U-shaped sliding plate; 33. T-shaped slider; 34. Limiting block; 35. Limiting pin; 36. V-shaped sliding plate; 37. Electrically controlled telescopic cylinder; 38. Hexagonal base; 39. Projector body. Detailed Implementation

[0043] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0044] Example 1: This example provides a video conferencing projection device, see below. Figure 1-13 Specifically, it includes an open box 1, which is a rectangular box with an open top. The bottom of the open box 1 is provided with a fixed plate 11. Each of the four corners of the fixed plate 11 is provided with an extension rod. The outer end of each extension rod is fixed to the corner of the inner wall of the open box 1. The top of the open box 1 is provided with a suspended lifting plate 2. The fixed plate 11 is connected to the lifting plate 2 through a lifting mechanism.

[0045] A balance disc 3 is provided directly above the lifting plate 2. A fixed shaft 21 is inserted into the middle of the bottom surface of the lifting plate 2. A rotating inner sleeve 22 is fitted on the upper middle part of the fixed shaft 21. An outer sleeve 23 is fitted on the middle part of the inner sleeve 22. The balance disc 3 is connected to the fixed shaft 21, the inner sleeve 22, and the outer sleeve 23 through a balancing mechanism.

[0046] A hexagonal ring 31 is fixed on the top surface of the balance disc 3. A hexagonal base 38 is provided inside the hexagonal ring 31 and is engaged with it. The projector body 39 is fixed in the middle of the top surface of the hexagonal base 38. The hexagonal ring 31 is connected to the hexagonal base 38 through an engagement mechanism.

[0047] In the specific implementation process, such as Figure 4 and Figure 5 As shown, the lifting mechanism includes a support swing arm 12 and a lifting swing arm 15. Each of the four sides of the fixed plate 11 is provided with a pair of support swing arms 12 that are arranged in a “V” shape, staggered upwards and movably hinged. Each pair of support swing arms 12 is provided with a pair of support connecting rods 13 that are movably hinged in the middle at the top.

[0048] The four sides of the lifting plate 2 are provided with a pair of lifting swing arms 15 that are arranged in a “V” shape and are movably hinged. The bottom end of each pair of lifting swing arms 15 is provided with a pair of lifting connecting rods 14 that are movably hinged in the middle. The top end of each pair of supporting connecting rods 13 is movably hinged to the bottom end of the corresponding pair of lifting connecting rods 14.

[0049] When a pair of support arms 12 are closed relative to each other, the cross hinge action of the support link 13 and the lifting link 14 in sequence drives each pair of lifting arms 15 to close relative to each other, thereby driving the lifting plate 2 and the balance plate 3 to rise slowly, so that the lifting plate 2 can drive the projector body 39 to rise to a suitable position, thus facilitating the projector body 39 to project.

[0050] In the specific implementation process, such as Figure 8 and Figure 9 As shown, the balancing mechanism includes an L-shaped swing rod 24 and an L-shaped swing arm 25. The outer ring surface of the balance disc 3 is provided with three staggered and movably hinged L-shaped swing rods 24. The top ends of the fixed shaft 21, the inner sleeve 22, and the outer sleeve 23 are sequentially fixed with three staggered L-shaped swing arms 25. The outer end of each L-shaped swing arm 25 is movably hinged to the bottom end of the corresponding L-shaped swing rod 24.

[0051] When the L-shaped swing arm 25 rotates, it can drive the balance disk 3 to tilt to one side through the hinge action with the L-shaped swing rod 24, so that the balance disk 3 and the projector body 39 maintain the position of positive projection, thereby enhancing the balance of the projector body 39.

[0052] In the specific implementation process, such as Figure 12 and Figure 13 As shown, the engaging mechanism includes a limiting insert 34. Six circularly distributed U-shaped slide plates 32 are fixed on the top surface of the hexagonal ring 31. Each U-shaped slide plate 32 has a slidingly connected T-shaped slider 33 engaged inside. Each T-shaped slider 33 has a vertically distributed limiting insert 34 fixed on its inner side wall. The outer side of the hexagonal base 38 has six circularly distributed limiting slots. The inner end of each limiting insert 34 is inserted into the corresponding limiting slot.

[0053] When the six T-shaped sliders 33 slide inward simultaneously, the inner ends of the six limiting blocks 34 are inserted into the corresponding limiting slots, thus limiting and fixing the hexagonal base 38 and increasing the stability of the projector body 39 during installation.

[0054] It should be noted that: In this embodiment, a circular groove is provided on the outer side of the balance disc 3, and an electrically controlled telescopic cylinder 37 with the output end facing outward is fixed inside the circular groove. A telescopic connecting block is fixed at the end of the telescopic rod of the electrically controlled telescopic cylinder 37, and a telescopic connecting rod is fixed at the top of the telescopic connecting block. The inner end of the telescopic connecting rod is fixed to one of the T-shaped sliders 33. When the telescopic rod of the electrically controlled telescopic cylinder 37 is shortened, the telescopic connecting block drives the telescopic connecting rod and a T-shaped slider 33 to slide inward along the U-shaped slide plate 32.

[0055] The top of the open box 1 is provided with a rectangular top cover, and the inner top wall of the rectangular top cover is recessed with a circular protective cover. The projector body 39 is located inside the circular protective cover, and rollers are provided at the four corners of the bottom surface of the open box 1.

[0056] Example 2: In Example 1, there is still a problem of inconvenient adjustment of the lifting mechanism. Therefore, based on Example 1, this example also includes:

[0057] In the specific implementation process, such as Figure 5 and Figure 6 As shown, L-shaped brackets are fixed to the center of the four sides of the bottom surface of the fixed plate 11. A vertically penetrating and rotatably connected worm gear 17 is inserted into the outer end of each L-shaped bracket. The top end of each worm gear 17 extends to the bottom end of the corresponding pair of support swing arms 12. A notched worm wheel 16 is fixed to the bottom end of each pair of support swing arms 12. The pair of notched worm wheels 16 are symmetrically distributed on both sides of the worm gear 17. The worm gear 17 is meshed with the pair of notched worm wheels 16. The meshing of the worm gear 17 drives the pair of notched worm wheels 16 to rotate relative to each other, thereby driving each pair of support swing arms 12 to close relative to each other.

[0058] Each worm gear 17 has a concentrically fixed driven gear 18 fitted at its bottom end. A circular through hole is opened in the middle of the bottom surface of the fixing plate 11. A first motor 19 with its output end facing downward is fixed inside the circular through hole. A drive gear disk 110 is fitted at the end of the motor shaft of the first motor 19 and is concentrically fixed. The drive gear disk 110 is meshed with the four driven gears 18. The motor shaft of the first motor 19 drives the drive gear disk 110, and the drive gear disk 110 meshes with and drives the driven gears 18 and worm gear 17 to rotate.

[0059] Example 3: In Example 1, there is a problem that the balancing mechanism is inconvenient to adjust. Therefore, based on Example 1, this example also includes:

[0060] In the specific implementation process, such as Figure 8 and Figure 9As shown, the bottom end of the inner sleeve 22, the bottom end of the outer sleeve 23, and the middle of the fixed shaft 21 are all fitted with concentrically fixed adjustment secondary gears 26. The three adjustment secondary gears 26 are stacked. The top surface of the lifting plate 2 is fixed with three second motors 27 arranged in a circle around the fixed shaft 21. The motor shaft end of each second motor 27 is fitted with a concentrically fixed adjustment main gear 28. The three adjustment main gears 28 are staggered at different heights, and each adjustment main gear 28 is meshed with the corresponding adjustment secondary gear 26.

[0061] Each of the two second motors 27 is individually controlled to drive the main gear 28 to rotate within a small range. The main gear 28 meshes with and drives the corresponding secondary gear 26, inner sleeve 22, outer sleeve 23, and fixed shaft 21 to rotate, so that the three L-shaped swing arms 25 rotate individually.

[0062] Example 4: In Example 1, there is a problem that the locking mechanism is inconvenient to adjust. Therefore, based on Example 1, this example also includes:

[0063] In the specific implementation process, such as Figure 12 and Figure 13 As shown, six elliptical pin holes are arranged in a circular pattern on the top surface of the hexagonal ring 31. The six elliptical pin holes and six U-shaped sliding plates 32 are alternately distributed. Each elliptical pin hole is fitted with a sliding limit pin 35. A V-shaped sliding plate 36 is fixed at the top of each limit pin 35. The wall thicknesses of each V-shaped sliding plate 36 are staggered. A rectangular sliding hole is opened in the middle of the side wall of each T-shaped slider 33. The opposite ends of an adjacent pair of V-shaped sliding plates 36 are slidably inserted into the corresponding rectangular sliding hole.

[0064] When a T-shaped slider 33 slides inward along the U-shaped slide plate 32, the T-shaped slider 33 drives the adjacent pair of V-shaped slide plates 36 to slide relative to each other, and drives the limiting pin 35 to slide inward along the elliptical pin hole, thereby driving the remaining T-shaped sliders 33 to slide inward synchronously.

[0065] Example 5: Specifically, the working principle and operation method of the present invention are as follows:

[0066] Step 1: Open the rectangular top cover. The projector body 39 and the hexagonal base 38 are placed in the center inside the hexagonal ring 31. Activate the electric telescopic cylinder 37. The telescopic rod of the electric telescopic cylinder 37 is shortened. Through the telescopic connecting block, the telescopic connecting rod and a T-shaped slider 33 slide inward along the U-shaped slide plate 32. The T-shaped slider 33 drives the adjacent pair of V-shaped slide plates 36 to slide relative to each other, and drives the limiting pin 35 to slide inward along the elliptical pin hole. This drives the remaining T-shaped sliders 33 to slide inward synchronously, so that the inner ends of the six limiting blocks 34 are all inserted into the corresponding limiting slots, thus limiting and fixing the hexagonal base 38.

[0067] Step 2: Start the first motor 19. The motor shaft of the first motor 19 drives the drive gear disk 110. The drive gear disk 110 meshes and drives the driven gear 18 and the worm 17 to rotate. The worm 17 meshes and drives a pair of notched worm wheels 16 to rotate relative to each other, thereby driving each pair of support swing arms 12 to close relative to each other. Then, through the cross hinge action of the support connecting rod 13 and the lifting connecting rod 14, each pair of lifting swing arms 15 is driven to close relative to each other, thereby driving the lifting plate 2 and the balance disk 3 to slowly rise.

[0068] Step 3: Start the projector body 39. Under the projection of the projector body 39, conduct a video conference. According to the projection position, start the three second motors 27. The motor shaft of the second motor 27 drives the main adjustment gear 28 to rotate within a small range. The main adjustment gear 28 meshes and drives the corresponding secondary adjustment gear 26, inner sleeve 22, outer sleeve 23, and fixed shaft 21 to rotate, which in turn drives the L-shaped swing arm 25 to rotate synchronously. Then, the L-shaped swing rod 24 drives the balance disk 3 to adjust the balance, so that the balance disk 3 and the projector body 39 maintain the position of positive projection.

[0069] This invention solves the problems of unstable projector mounting and inconvenient balance calibration. Furthermore, the overall structure is compact, which increases the stability of the projector installation and enhances the balance of the projector body.

[0070] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A video conferencing projection device, comprising an open box (1), characterized in that: The open box (1) is a rectangular box with an open top. A fixed plate (11) is provided at the bottom of the open box (1). An extension rod is provided at each of the four corners of the fixed plate (11). The outer end of each extension rod is fixed to the corner of the inner wall of the open box (1). A suspended lifting plate (2) is provided at the top of the open box (1). The fixed plate (11) is connected to the lifting plate (2) through a lifting mechanism. A balance plate (3) is provided directly above the lifting plate (2). A rotatably connected fixed shaft (21) is inserted into the middle of the bottom surface of the lifting plate (2). The upper middle part is fitted with a rotating inner sleeve (22), and the middle part of the inner sleeve (22) is fitted with a rotating outer sleeve (23). The balance disc (3) is connected to the fixed shaft (21), the inner sleeve (22), and the outer sleeve (23) through a balancing mechanism. A hexagonal ring (31) is fixed on the top surface of the balance disc (3). A hexagonal base (38) is provided inside the hexagonal ring (31) and is engaged with it. A projector body (39) is fixed in the middle of the top surface of the hexagonal base (38). The hexagonal ring (31) is connected to the hexagonal base (38) through an engaging mechanism. The lifting mechanism includes a support swing arm (12) and a lifting swing arm (15). Each of the four sides of the fixed plate (11) has a pair of support swing arms (12) arranged in a V-shape, staggered upwards and hinged together. Each pair of support swing arms (12) has a pair of support connecting rods (13) that are hinged together at their midpoints. Each of the four sides of the lifting plate (2) has a pair of lifting swing arms (15) arranged in a V-shape, staggered downwards and hinged together. Each pair of lifting swing arms (15) has a pair of lifting connecting rods (14) that are hinged together at their midpoints. The top of each pair of support connecting rods (13) is hinged to the bottom of the corresponding pair of lifting connecting rods (14). Each of the four sides of the bottom surface of the fixed plate (11) has an L-shaped bracket fixedly installed. The outer end of each L-shaped bracket is inserted with... A worm (17) is provided that runs vertically through and is rotatably connected. The top end of each worm (17) extends to the bottom end of a pair of supporting swing arms (12). A notched worm wheel (16) is fixedly provided at the bottom end of each pair of supporting swing arms (12). The notched worm wheels (16) are symmetrically distributed on both sides of the worm (17). The worm (17) meshes with the pair of notched worm wheels (16). A driven gear (18) is sleeved on the bottom end of each worm (17). A circular through hole is opened in the middle of the bottom surface of the fixing plate (11). A first motor (19) with the output end facing down is fixed inside the circular through hole. A drive gear disk (110) is sleeved on the end of the motor shaft of the first motor (19). The drive gear disk (110) meshes with four driven gears (18). The balancing mechanism includes an L-shaped swing rod (24) and an L-shaped swing arm (25). The outer ring surface of the balancing disc (3) is provided with three staggered and movably hinged L-shaped swing rods (24). The top ends of the fixed shaft (21), the inner sleeve (22), and the outer sleeve (23) are sequentially fixed with three staggered L-shaped swing arms (25). The outer end of each L-shaped swing arm (25) is movably hinged to the bottom end of the corresponding L-shaped swing rod (24). The bottom end of the inner sleeve (22), the bottom end of the outer sleeve (23), and the fixed shaft are all connected to the bottom end of the corresponding L-shaped swing rod (24). (21) is provided with concentrically fixed adjustment secondary gears (26) in the middle. The three adjustment secondary gears (26) are stacked. The top surface of the lifting plate (2) is fixed with three second motors (27) arranged in a circle around the fixed shaft (21). The motor shaft end of each second motor (27) is provided with a concentrically fixed adjustment main gear (28). The three adjustment main gears (28) are staggered at different heights, and each adjustment main gear (28) is meshed with the corresponding adjustment secondary gear (26).

2. The video conferencing projection device according to claim 1, characterized in that: The engaging mechanism includes a limiting insert (34). Six circularly distributed U-shaped sliding plates (32) are fixed on the top surface of the hexagonal ring (31). Each U-shaped sliding plate (32) has a slidingly connected T-shaped slider (33) inside. Each T-shaped slider (33) has a vertically distributed limiting insert (34) fixed on its inner sidewall. The outer side of the hexagonal base (38) has six circularly distributed limiting slots. The inner end of each limiting insert (34) is inserted into the corresponding limiting slot.

3. A video conferencing projection device according to claim 2, characterized in that: The top surface of the hexagonal ring (31) is provided with six circularly arranged elliptical pin holes. The six elliptical pin holes and the six U-shaped sliding plates (32) are alternately distributed. Each elliptical pin hole is fitted with a slidingly connected limiting pin (35). The top end of each limiting pin (35) is fixed with a V-shaped sliding plate (36). The wall thicknesses on both sides of each V-shaped sliding plate (36) are staggered. A rectangular sliding hole is provided in the middle of the side wall of each T-shaped slider (33). The opposite ends of an adjacent pair of V-shaped sliding plates (36) are slidably inserted into the corresponding rectangular sliding hole.

4. A video conferencing projection device according to claim 3, characterized in that: A circular groove is provided on the outer side of the balance disc (3). An electrically controlled telescopic cylinder (37) with the output end facing outward is fixed inside the circular groove. A telescopic connecting block is fixed at the end of the telescopic rod of the electrically controlled telescopic cylinder (37). A telescopic connecting rod is fixed at the top of the telescopic connecting block. The inner end of the telescopic connecting rod is fixed to one of the T-shaped sliders (33). A rectangular top cover is provided on the top of the open box (1). A circular protective cover is recessed upward on the inner top wall of the rectangular top cover. The projector body (39) is located inside the circular protective cover. Rollers are provided at the four corners of the bottom surface of the open box (1).

5. The projection method of a video conferencing projection device according to claim 4, characterized in that, Includes the following steps: Step 1: Open the rectangular top cover. Place the projector body (39) and hexagonal base (38) in the center inside the hexagonal ring (31). Start the electric telescopic cylinder (37). The telescopic rod of the electric telescopic cylinder (37) shortens. Through the telescopic connecting block, the telescopic connecting rod and a T-shaped slider (33) slide inward along the U-shaped sliding plate (32). The T-shaped slider (33) drives the adjacent pair of V-shaped sliding plates (36) to slide relative to each other. It also drives the limiting pin (35) to slide inward along the elliptical pin hole. This drives the remaining T-shaped sliders (33) to slide inward synchronously, so that the inner ends of the six limiting blocks (34) are all inserted into the corresponding limiting slots, thus forming a limiting fixation for the hexagonal base (38). Step 2: Start the first motor (19). The motor shaft of the first motor (19) drives the drive gear disk (110). The drive gear disk (110) meshes and drives the driven gear (18) and worm (17) to rotate. The worm (17) meshes and drives a pair of notched worm wheels (16) to rotate relative to each other, thereby driving each pair of support swing arms (12) to close relative to each other. Then, through the cross hinge action of the support connecting rod (13) and the lifting connecting rod (14), each pair of lifting swing arms (15) is driven to close relative to each other, thereby driving the lifting plate (2) and balance disk (3) to rise slowly. Step 3: Start the projector body (39). Under the projection of the projector body (39), conduct a video conference. According to the projection position, start the three second motors (27). The motor shaft of the second motor (27) drives the main gear (28) to rotate within a small range. The main gear (28) meshes and drives the corresponding secondary gear (26), inner sleeve (22), outer sleeve (23), and fixed shaft (21) to rotate, thereby driving the L-shaped swing arm (25) to rotate synchronously. Then, the L-shaped swing rod (24) drives the balance disk (3) to adjust the balance, so that the balance disk (3) and the projector body (39) maintain the position of positive projection.

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