CN220910968U - Projection arrangement that can freely adjust - Google Patents

Abstract

The utility model relates to the technical field of projection equipment, in particular to a projection device capable of being freely adjusted, which comprises a support plate, wherein a left-right adjusting mechanism capable of sliding back and forth and a front-back adjusting mechanism used for driving the left-right adjusting mechanism to slide are arranged on the support plate, and a support block is arranged on the left-right adjusting mechanism so as to enable the support block to move left and right; the projector comprises a projector body, a supporting block, a projector, a vertical rotating rod, a driving mechanism, an up-down adjusting mechanism, an angle adjusting mechanism and a supporting frame, wherein the projector and the vertically arranged rotating rod are arranged, the top end of the rotating rod is rotatably arranged with the supporting block, the driving mechanism for driving the rotating rod to rotate is arranged on the supporting block, the up-down adjusting mechanism for adjusting the height of the projector is arranged on the rotating rod, the angle adjusting mechanism for adjusting the angle of the projector is arranged on the up-down adjusting mechanism, the supporting frame is arranged on the angle adjusting mechanism, and the projector is placed in the supporting frame; the utility model is matched with each mechanism so that the projector can be freely adjusted.

Description

Projection arrangement that can freely adjust

Technical Field

The present utility model relates to the field of projection devices, and more particularly, to a freely adjustable projection device.

Background

The projection device is common equipment in modern life and is widely applied to the fields of education, business, home entertainment and the like. The conventional projection device mainly comprises a projector, a projection screen, a projection bracket and the like. Among them, a projector is a core part of a projection apparatus, which converts an image or video signal into visible light, and projects the visible light onto a projection screen through a lens, thereby realizing a large-screen display. A projection screen is a medium that receives projection light, the quality of which directly affects the projection effect. The projection bracket is used for fixing the projector and ensuring the stable work of the projector.

The Chinese patent document with publication number CN211289420U discloses a projector capable of being freely adjusted, and specifically discloses: the projector comprises a base, wherein a height adjusting mechanism is arranged on the base, an angle adjusting mechanism is arranged at the top end of the height adjusting mechanism, a projector mounting box is arranged at the top of the angle adjusting mechanism, and a projector body is arranged in the projector mounting box; through the setting of high adjusting device and angle adjusting device, start first servo motor, first servo motor drives high adjusting screw and rotates, because the base is motionless, thereby realized the free regulation to the height, start second servo motor, second servo motor drives the angle regulation pole and rotates, through the cooperation of screw thread and teeth of a cogwheel, realized the free regulation to the angle, can produce the deviation of relative initial mounted position after having solved current projecting apparatus and having used a period, influenced the projecting effect of projecting apparatus, the extravagant a large amount of time of regulation and very inconvenient problem, the projected height of quick regulation and angle.

From the above, the existing projector capable of being freely adjusted adjusts the position of the projector through the height adjusting mechanism and the angle adjusting mechanism, wherein the height adjusting mechanism is used for adjusting the height of the projector, and the angle adjusting mechanism is used for adjusting the angle between the projection direction of the projector and the horizontal plane so as to solve the deviation of the projector relative to the initial installation position. However, the existing projector can only perform height adjustment and one angle adjustment, and cannot enable the projector to be rotationally adjusted on a horizontal plane; moreover, when the projection picture is required to be moved, the projector needs to be made to move in parallel, however, the existing projector cannot translate, so that the adjusting function of the existing projector is single, and the practicability is not high. Therefore, a freely adjustable projection device is provided to solve the above technical problems.

Disclosure of utility model

The utility model aims to provide a freely adjustable projection device aiming at the defects of the prior art so as to solve the technical problems of single adjusting function and the like of the prior projector.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

A projection device capable of being freely adjusted comprises a supporting plate, wherein a left-right adjusting mechanism capable of sliding forwards and backwards and a front-back adjusting mechanism used for driving the left-right adjusting mechanism to slide are arranged on the supporting plate, and a supporting block is arranged on the left-right adjusting mechanism so that the supporting block can move leftwards and rightwards;

Still including projecting apparatus and vertical arrangement's bull stick, and the top and the supporting shoe rotation setting of bull stick are equipped with on the supporting shoe and are used for driving the bull stick and carry out pivoted actuating mechanism, and be equipped with the upper and lower adjustment mechanism who is used for adjusting projecting apparatus height on the bull stick, be equipped with the angle adjustment mechanism who is used for adjusting projecting apparatus angle on upper and lower adjustment mechanism, and be equipped with the carriage on the angle adjustment mechanism, the projecting apparatus is placed in the carriage.

Further, a baffle plate for preventing the projector from being separated from the supporting frame is arranged on the supporting frame, and the baffle plate is detachable.

Further, the left-right adjusting mechanism comprises a movable plate which slides back and forth on the supporting plate, a sliding block is fixedly arranged on one side, close to the supporting plate, of the movable plate, a first sliding groove is formed in the supporting plate, and the sliding block is arranged in the first sliding groove so that the movable plate slides back and forth on the supporting plate; the movable plate is provided with a second chute which is horizontally arranged, the second chute is perpendicular to the first chute, a fixed block is slidably arranged in the second chute, and the fixed block and the supporting block are fixedly arranged, so that the supporting block can slide left and right on the movable plate.

Further, a groove with the length direction consistent with the sliding direction of the supporting block is arranged on the bottom surface of the movable plate, and racks arranged along the length direction of the groove are fixedly arranged in the groove; the support block is provided with a first stepping motor, the output shaft of the first stepping motor is provided with a first gear, and the rack is meshed with the first gear.

Further, the front-back adjusting mechanism comprises a second stepping motor arranged on the supporting plate, a screw rod with the axial direction being consistent with the length direction of the first sliding groove is arranged on an output shaft of the second stepping motor, and a thread part of the screw rod is arranged in the first sliding groove and is in threaded connection with the sliding block.

Further, the driving mechanism comprises a toothed ring arranged on the outer side of the rotating rod, a third stepping motor is arranged on the supporting block, a second gear is arranged on an output shaft of the third stepping motor, and the toothed ring is meshed with the second gear.

Further, a first protecting shell for covering the toothed ring and the second gear is arranged on the supporting block so as to protect the toothed ring and the second gear.

Further, the up-down adjusting mechanism comprises a lifting rod with the axial direction consistent with that of the rotating rod, a cavity is formed in the rotating rod, one end of the lifting rod is arranged in the cavity, the other end of the lifting rod is arranged on the outer side of the rotating rod and connected with the angle adjusting mechanism, a lifting block is fixedly arranged on the end part of the lifting rod arranged in the cavity, and the lifting block and the inner side wall of the rotating rod are arranged in a sliding manner; an electric push rod with a telescopic rod arranged downwards is arranged in the cavity, and the telescopic rod of the electric push rod is fixedly arranged with the lifting block.

Further, the angle adjusting mechanism comprises a supporting frame fixedly arranged with the lifting rod and a rotating shaft rotatably arranged on the supporting frame, the rotating shaft is horizontally arranged, a rotating frame is fixedly arranged on the rotating shaft, and the rotating frame is fixedly arranged with the supporting frame through a mounting plate; the double-shaft motor is arranged on the supporting frame, fourth gears are arranged on output shafts on two sides of the double-shaft motor, third gears are arranged on two ends of the rotating shaft, and the fourth gears are meshed with the third gears.

Further, a pair of clamping plates for clamping the projector are arranged in the supporting frame, guide rods are fixedly arranged on the upper side and the lower side of the inside of the supporting frame, and the clamping plates are slidably arranged on the guide rods, so that the clamping plates slide on the guide rods in a direction approaching or separating from the projector; a pair of springs for applying force to the clamping plate are arranged on the guide rod so as to push the clamping plate to clamp the projector.

The utility model has the beneficial effects that: when the projection screen is used, under the action of the left-right adjusting mechanism and the front-back adjusting mechanism, when the supporting block can move forwards and backwards and leftwards, the supporting block carries the rotating rod, the driving mechanism, the up-down adjusting mechanism, the angle adjusting mechanism, the supporting frame and the projector to move forwards and backwards and leftwards and rightwards together, so that the position of the projector is adjusted, and the position of the projection screen is adjusted.

Secondly, actuating mechanism rotates at the bull stick when rotating, then brings upper and lower adjustment mechanism, angle adjustment mechanism and braced frame and rotates together to make the projecting apparatus of placing in the braced frame rotate around the pole tip central point, in order to rotate the regulation to the projecting apparatus, improve projection effect.

In addition, after the up-down adjusting mechanism is operated, the angle adjusting mechanism and the supporting frame can be enabled to move up and down so as to adjust the height position of the projector, and therefore the projection picture is translated up and down;

Finally, under the action of the angle adjusting mechanism, the angle between the supporting frame and the horizontal plane is adjusted, so that the angle between the projection direction of the projector and the horizontal plane is adjusted, the projection direction is perpendicular to the wall surface, and the projection effect of the projector is further improved; with the cooperation of the various mechanisms, so that the projector can be freely adjusted.

Drawings

Fig. 1 is a schematic perspective view of the present utility model.

Fig. 2 is a schematic perspective view of another view of the present utility model.

Fig. 3 is a schematic structural view of the left-right adjusting mechanism and the front-rear adjusting mechanism of the present utility model.

Fig. 4 is a schematic view of a part of the structure of the left-right adjusting mechanism of the present utility model.

Fig. 5 is a schematic structural view of the up-down adjusting mechanism and the driving mechanism of the present utility model.

Fig. 6 is a schematic structural view of the angle adjusting mechanism of the present utility model.

Fig. 7 is a schematic view of the internal structure of the support frame of the present utility model.

The reference numerals include:

1. A support plate; 2. a fixing plate; 3. a left-right adjusting mechanism; 301. a movable plate; 302. a slide block; 303. a first chute; 304. a second chute; 305. a fixed block; 306. a groove; 307. a rack; 308. a first stepping motor; 309. a first gear; 4. a front-rear adjusting mechanism; 401. a second stepping motor; 402. a screw rod; 5. a support block; 6. an up-down adjusting mechanism; 601. a rotating rod; 602. a cavity; 603. a lifting rod; 604. a lifting block; 605. an electric push rod; 7. a driving mechanism; 701. a toothed ring; 702. a third stepper motor; 703. a second gear; 704. a first protective shell; 8. an angle adjusting mechanism; 801. a support frame; 802. a rotating shaft; 803. a rotating frame; 804. a mounting plate; 805. a third gear; 806. a biaxial motor; 807. a fourth gear; 808. a second protective shell; 9. a support frame; 10. a projector; 11. a baffle; 12. a guide rod; 13. a clamping plate; 14. and (3) a spring.

Detailed Description

The following describes a freely adjustable projection device according to the utility model in detail with reference to the accompanying drawings.

As shown in fig. 1-2, an embodiment of a freely adjustable projection device of the present utility model includes a support plate 1 for fixing the entire projection device on a wall top, and the support plate 1 is fixedly disposed with the wall top by a fixing plate 2, so that the support plate 1 and the wall top can be stably fixedly disposed; wherein, be equipped with on backup pad 1 can carry out the gliding about adjustment mechanism 3 and be used for driving about adjustment mechanism 3 and carry out gliding about adjustment mechanism 4 to be equipped with supporting shoe 5 on about adjustment mechanism 3, under the effect of about adjustment mechanism 3, with the drive supporting shoe 5 about move, and under the effect of about adjustment mechanism 4, drive about adjustment mechanism 3 and supporting shoe 5 simultaneously and carry out the back-and-forth movement, control mechanism 3 and the cooperation of about adjustment mechanism 4, so that supporting shoe 5 can freely carry out the back-and-forth and side-to-side movement on backup pad 1. Secondly, the projection device further comprises a rotating rod 601 which is vertically arranged, the top end of the rotating rod 601 and the supporting block 5 are rotatably arranged, a driving mechanism 7 for driving the rotating rod 601 to rotate is further arranged on the supporting block 5, and under the action of the driving mechanism 7, the rotating rod 601 is driven to rotate around the center point of the end part of the rotating rod 601 on the supporting block 5; further, an up-down adjusting mechanism 6 is arranged on the rotating rod 601, and when the driving mechanism 7 drives the rotating rod 601 to rotate, the rotating rod 601 rotates together with the up-down adjusting mechanism 6; an angle adjusting mechanism 8 is arranged on the upper and lower adjusting mechanisms 6, a supporting frame 9 is arranged on the angle adjusting mechanism 8, and a projector 10 for projecting pictures is placed in the supporting frame 9.

Specifically, when the supporting block 5 moves back and forth and left and right under the action of the left and right adjusting mechanism 3 and the front and rear adjusting mechanism 4, the supporting block 5 moves back and forth and left and right with the rotating rod 601, the driving mechanism 7, the up and down adjusting mechanism 6, the angle adjusting mechanism 8, the supporting frame 9 and the projector 10, so as to adjust the position of the projector 10 to adjust the position of the projection screen; secondly, when the rotating rod 601 rotates, the vertical adjusting mechanism 6, the angle adjusting mechanism 8 and the supporting frame 9 are carried to rotate together, so that the projector 10 placed in the supporting frame 9 rotates around the center point of the end part of the rotating rod 601, and the projector 10 is rotationally adjusted, and the projection effect is improved; in addition, after the up-down adjusting mechanism 6 is operated, the angle adjusting mechanism 8 and the supporting frame 9 can be enabled to move up and down so as to adjust the height position of the projector 10, thereby translating the projection picture up and down; finally, under the action of the angle adjusting mechanism 8, the angle between the supporting frame 9 and the horizontal plane is adjusted, so that the angle between the projection direction of the projector 10 and the horizontal plane is adjusted, the projection direction is perpendicular to the wall surface, and the projection effect of the projector 10 is further improved.

As shown in fig. 3, the left-right adjusting mechanism 3 includes a movable plate 301 that slides back and forth on the support plate 1, wherein a sliding block 302 is fixedly arranged on one side of the movable plate 301 near the support plate 1, and a first sliding groove 303 is arranged on the support plate 1, and the sliding block 302 is arranged in the first sliding groove 303 to enable the movable plate 301 to slide back and forth on the support plate 1; second, a second chute 304 is horizontally arranged on the movable plate 301, and the second chute 304 is perpendicular to the first chute 303, a fixed block 305 is slidably arranged in the second chute 304, and the fixed block 305 and the supporting block 5 are fixedly arranged, so that the supporting block 5 can slide left and right on the movable plate 301. When the movable plate 301 slides back and forth on the support plate 1, the support block 5 is moved back and forth, but when the support block 5 is biased, the support block 5 is driven to move left and right on the movable plate 301.

As shown in fig. 4, in order to drive the support block 5 to move left and right, a groove 306 having a length direction identical to the sliding direction of the support block 5 is provided on the bottom surface of the movable plate 301, a rack 307 arranged along the length direction of the groove 306 is fixedly provided in the groove 306, a first stepping motor 308 is provided on the support block 5, a first gear 309 is provided on the output shaft of the first stepping motor 308, and the rack 307 is engaged with the first gear 309. When the support block 5 needs to be driven to move left and right on the movable plate 301, the first stepping motor 308 is started to drive the first gear 309 to rotate, and the rack 307 is fixedly arranged in the groove 306, so that when the first stepping motor 308 drives the first gear 309 to rotate, the first gear 309 rolls on the rack 307, the support block 5 can be made to move, the support block 5 can automatically move left and right on the movable plate 301, and the support block 5 can slide left and right together with the support frame 9 and the projector 10 to move left and right so as to adjust the position of the projector 10.

As shown in fig. 3, the front-rear adjusting mechanism 4 comprises a second stepping motor 401 arranged on the supporting plate 1, a screw rod 402 with the axial direction consistent with the length direction of the first chute 303 is arranged on an output shaft of the second stepping motor 401, and a threaded part of the screw rod 402 is arranged in the first chute 303 and is in threaded connection with the sliding block 302; when the second stepping motor 401 is started, the screw rod 402 can be driven to rotate forward and backward, and under the action of the slider 302, the movable plate 301 is driven to slide forward and backward on the support plate 1, so that the distance between the projector 10 and the wall surface (the projected wall surface) is adjusted.

As shown in fig. 5, the driving mechanism 7 comprises a toothed ring 701 arranged on the outer side of the rotating rod 601, wherein a third stepping motor 702 is arranged on the supporting block 5, a second gear 703 is arranged on an output shaft of the third stepping motor 702, and the toothed ring 701 is meshed with the second gear 703; when the rotating rod 601 needs to be driven to rotate, the third stepping motor 702 is started to drive the second gear 703 to rotate, and under the cooperation of the toothed ring 701 and the second gear 703, the rotating rod 601 is driven to rotate around the center point of the end part of the rotating rod 601 on the supporting block 5, so that the projection direction of the projector 10 is always perpendicular to the wall surface. In addition, a first protecting shell 704 for covering the toothed ring 701 and the second gear 703 is further provided on the supporting block 5, and the toothed ring 701 and the second gear 703 are protected under the action of the first protecting shell 704, so that dust is prevented from accumulating, and the toothed ring 701 and the second gear 703 are aged.

As shown in fig. 5, the up-down adjusting mechanism 6 includes a lifting rod 603 with an axial direction consistent with that of the rotating rod 601, wherein a cavity 602 is provided in the rotating rod 601, one end of the lifting rod 603 is disposed in the cavity 602, the other end of the lifting rod 603 is disposed outside the rotating rod 601 and connected with the angle adjusting mechanism 8, a lifting block 604 is fixedly disposed on an end portion of the lifting rod 603 disposed in the cavity 602, the lifting block 604 and an inner side wall of the rotating rod 601 slide, when the lifting block 604 is forced, the lifting block 604 can slide up and down in the cavity 602, the lifting block 604 carries the lifting rod 603 to move up and down to drive the angle adjusting mechanism 8 and the supporting frame 9 to move up and down together with the projector 10, thereby adjusting the height of the projector 10. However, in order to enable the lifting rod 603 to automatically move up and down, an electric push rod 605 with a downward telescopic rod is arranged in the cavity 602, and the telescopic rod of the electric push rod 605 is fixedly arranged with the lifting block 604; when the projector 10 needs to be adjusted downwards, the electric push rod 605 is started, and the telescopic rod stretches out, so that the lifting block 604 is pushed to slide downwards, and then the angle adjusting mechanism 8 and the supporting frame 9 are driven to move downwards together with the projector 10, so that the height of the projector 10 is automatically adjusted.

As shown in fig. 6, the angle adjusting mechanism 8 includes a supporting frame 801 fixed to the lifting rod 603 and a rotating shaft 802 rotatably disposed on the supporting frame 801, and the rotating shaft 802 is horizontally disposed, wherein a rotating frame 803 is fixedly disposed on the rotating shaft 802, and the rotating frame 803 is fixedly disposed on the supporting frame 9 through a mounting plate 804, under the action of the rotating shaft 802 and the rotating frame 803, the supporting frame 9 can rotate on the supporting frame 801, so as to adjust an angle between a projection direction of the projector 10 and a horizontal plane. In order to realize automatic adjustment, a double-shaft motor 806 is arranged on the support frame 801, fourth gears 807 are arranged on output shafts on two sides of the double-shaft motor 806, third gears 805 are arranged on two ends of the rotating shaft 802, and the fourth gears 807 are meshed with the third gears 805; when the angle between the projection direction of the projector 10 and the horizontal plane needs to be adjusted, the double-shaft motor 806 is started, and the rotating frame 803 is driven to rotate under the action of the fourth gear 807 and the third gear 805, so that the projector 10 is driven to rotate to adjust the angle. The support frame 801 is further provided with a second shield 808 for covering the fourth gear 807 and the third gear 805, and the second shield 808 functions similarly to the first shield 704 to prevent the fourth gear 807 and the third gear 805 from being aged by dust.

As shown in fig. 6, in order to enable the projector 10 to be stably placed in the support frame 9, a baffle 11 for preventing the projector 10 from being separated from the support frame 9 is provided on the support frame 9, and the baffle 11 is detachable, and after the baffle 11 is detached from the support frame 9, the projector 10 can be taken out of the support frame 9, so that maintenance and repair of the projector 10 can be performed. Wherein, a pair of clamping plates 13 for clamping the projector 10 are arranged in the supporting frame 9, guide rods 12 are fixedly arranged on the upper side and the lower side of the inside of the supporting frame 9, and the clamping plates 13 are slidably arranged on the guide rods 12, so that the clamping plates 13 slide on the guide rods 12 towards the direction approaching or far from the projector 10; in addition, a pair of springs 14 for biasing the clamping plate 13 are provided on the guide bar 12 to push the clamping plate 13 to clamp the projector 10; when the projector 10 is placed in the support frame 9, the clamp plates 13 on both sides slide in directions away from each other, and the springs 14 compress, thereby applying force to the clamp plates 13 to clamp the projector 10, so that the projector 10 can be stably placed in the support frame 9, and projectors 10 of different sizes can be placed in the support frame 9.

In view of the above, the present utility model has the above-mentioned excellent characteristics, so that it can be used to improve the performance and practicality of the prior art, and is a product with great practical value.

The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.

Claims (10)

1. The utility model provides a projection arrangement that can freely adjust, is including backup pad (1), its characterized in that: a left-right adjusting mechanism (3) capable of sliding back and forth and a front-back adjusting mechanism (4) for driving the left-right adjusting mechanism (3) to slide are arranged on the supporting plate (1), and a supporting block (5) is arranged on the left-right adjusting mechanism (3) so as to enable the supporting block (5) to move left and right;

Still including projecting apparatus (10) and vertical arrangement's bull stick (601), and the top and the supporting shoe (5) rotation setting of bull stick (601), be equipped with on supporting shoe (5) and be used for driving bull stick (601) and carry out pivoted actuating mechanism (7), and be equipped with on bull stick (601) and be used for adjusting projecting apparatus (10) high upper and lower adjustment mechanism (6), be equipped with on upper and lower adjustment mechanism (6) and be used for adjusting projecting apparatus (10) angle adjustment mechanism (8), and be equipped with braced frame (9) on angle adjustment mechanism (8), projecting apparatus (10) are placed in braced frame (9).

2. A freely adjustable projection device as claimed in claim 1, wherein: a baffle plate (11) for preventing the projector (10) from being separated from the supporting frame (9) is arranged on the supporting frame (9), and the baffle plate (11) is detachable.

3. A freely adjustable projection device as claimed in claim 1, wherein: the left-right adjusting mechanism (3) comprises a movable plate (301) sliding back and forth on the supporting plate (1), a sliding block (302) is fixedly arranged on one side, close to the supporting plate (1), of the movable plate (301), a first sliding groove (303) is formed in the supporting plate (1), and the sliding block (302) is arranged in the first sliding groove (303) so that the movable plate (301) slides back and forth on the supporting plate (1); a second chute (304) horizontally arranged is arranged on the movable plate (301), the second chute (304) is perpendicular to the first chute (303), a fixed block (305) is slidably arranged in the second chute (304), and the fixed block (305) and the supporting block (5) are fixedly arranged, so that the supporting block (5) can slide left and right on the movable plate (301).

4. A freely adjustable projection device as claimed in claim 3, wherein: a groove (306) with the length direction consistent with the sliding direction of the supporting block (5) is arranged on the bottom surface of the movable plate (301), and a rack (307) arranged along the length direction of the groove (306) is fixedly arranged in the groove; the support block (5) is provided with a first stepping motor (308), the output shaft of the first stepping motor (308) is provided with a first gear (309), and the rack (307) is meshed with the first gear (309).

5. A freely adjustable projection device as claimed in claim 3, wherein: the front-back adjusting mechanism (4) comprises a second stepping motor (401) arranged on the supporting plate (1), a screw rod (402) with the axial direction being consistent with the length direction of the first sliding groove (303) is arranged on an output shaft of the second stepping motor (401), and a threaded part of the screw rod (402) is arranged in the first sliding groove (303) and is in threaded connection with the sliding block (302).

6. A freely adjustable projection device as claimed in claim 1, wherein: the driving mechanism (7) comprises a toothed ring (701) arranged on the outer side of the rotating rod (601), a third stepping motor (702) is arranged on the supporting block (5), a second gear (703) is arranged on an output shaft of the third stepping motor (702), and the toothed ring (701) is meshed with the second gear (703).

7. The freely adjustable projection device of claim 6, wherein: a first protective shell (704) for covering the toothed ring (701) and the second gear (703) is arranged on the supporting block (5) so as to protect the toothed ring (701) and the second gear (703).

8. A freely adjustable projection device as claimed in claim 1, wherein: the up-down adjusting mechanism (6) comprises a lifting rod (603) with the axial direction being consistent with that of the rotating rod (601), a cavity (602) is formed in the rotating rod (601), one end of the lifting rod (603) is arranged in the cavity (602), the other end of the lifting rod is arranged outside the rotating rod (601) and connected with the angle adjusting mechanism (8), a lifting block (604) is fixedly arranged on the end part of the lifting rod (603) arranged in the cavity (602), and the lifting block (604) and the inner side wall of the rotating rod (601) are arranged in a sliding mode; an electric push rod (605) with a telescopic rod arranged downwards is arranged in the cavity (602), and the telescopic rod of the electric push rod (605) is fixedly arranged with the lifting block (604).

9. The freely adjustable projection device of claim 8, wherein: the angle adjusting mechanism (8) comprises a supporting frame (801) fixedly arranged with the lifting rod (603) and a rotating shaft (802) rotatably arranged on the supporting frame (801), the rotating shaft (802) is horizontally arranged, a rotating frame (803) is fixedly arranged on the rotating shaft (802), and the rotating frame (803) is fixedly arranged with the supporting frame (9) through a mounting plate (804); the double-shaft motor (806) is arranged on the support frame (801), fourth gears (807) are arranged on output shafts on two sides of the double-shaft motor (806), third gears (805) are arranged on two ends of the rotating shaft (802), and the fourth gears (807) are meshed with the third gears (805).

10. A freely adjustable projection device as claimed in claim 2, wherein: a pair of clamping plates (13) for clamping the projector (10) are arranged inside the supporting frame (9), guide rods (12) are fixedly arranged on the upper side and the lower side inside the supporting frame (9), and the clamping plates (13) are slidably arranged on the guide rods (12) so that the clamping plates (13) slide on the guide rods (12) in a direction approaching or separating from the projector (10); a pair of springs (14) for applying force to the clamping plate (13) are provided on the guide rod (12) to push the clamping plate (13) to clamp the projector (10).