CN110647003A - Curtain lifting mechanism and projection equipment - Google Patents
Curtain lifting mechanism and projection equipment Download PDFInfo
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- CN110647003A CN110647003A CN201910939698.6A CN201910939698A CN110647003A CN 110647003 A CN110647003 A CN 110647003A CN 201910939698 A CN201910939698 A CN 201910939698A CN 110647003 A CN110647003 A CN 110647003A
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- link
- curtain
- base
- piston
- edge
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
Abstract
The embodiment of the application provides a curtain elevating system and projection equipment, curtain elevating system includes the base, take-up device, curtain and folding device, take-up device installs in the base, the curtain has first edge and the second edge that sets up relative first edge, first edge connection is in take-up device, take-up device can be through first edge coiling curtain, folding device includes telescopic bracket and elastic component, the second edge of telescopic bracket connection base and curtain, telescopic bracket can contract or extend relative to the base, in order to drive the second edge and be close to or keep away from the base, elastic component elastic connection is in telescopic bracket, in order to provide the elastic force that telescopic bracket expanded relative base, in order to make the curtain keep level after expanding. After the winding device expands the curtain, the curtain is kept in a flattening state through the telescopic support and the elastic assembly, the curtain can overcome the influence of gravity, the expansion mode from bottom to top is realized, and the base can be placed on any platform without being hung on a ceiling.
Description
Technical Field
The application relates to the technical field of projection equipment, in particular to a curtain lifting mechanism and projection equipment.
Background
At present, the conventional projection curtain adopts two modes of opening and withdrawing from top to bottom or a fixed mode, the whole curtain in the mode of opening and withdrawing from top to bottom does not have any structural support, and the curtain can shake at will to influence the viewing quality.
Disclosure of Invention
The embodiment of the application provides a curtain lifting mechanism, which comprises a base, a winding device, a curtain and a folding device, the winding device is mounted on the base, the curtain is provided with a first edge and a second edge arranged opposite to the first edge, the first edge is connected to the winding device, the winding device can wind the curtain through the first edge, the folding device comprises a telescopic bracket and an elastic component, the telescopic bracket is connected with the base and the second edge of the curtain and can be contracted or extended relative to the base, so as to drive the second edge to be close to or far away from the base, the elastic component is elastically connected with the telescopic bracket, so as to provide the elastic force for the expansion of the telescopic bracket relative to the base, so that the curtain keeps flat after being expanded.
The embodiment of the application still provides a projection equipment, projection equipment includes projection arrangement, and as above curtain elevating system, projection arrangement is fixed in the base, projection arrangement is equipped with projection lens, projection lens with the curtain looks interval, projection lens can throw the image extremely on the curtain.
The curtain lifting mechanism and the projection equipment provided by the embodiment of the application are connected with the base through the winding device and the folding device, wherein, the two using states of the curtain curling and the curtain unfolding can be realized through the winding device, the folding device comprises a telescopic bracket and an elastic component, wherein the telescoping support connects the base and the second edge of the curtain, the elastic assembly is resiliently connected to the telescoping support, so as to provide the elastic force for the expansion of the telescopic bracket relative to the base, so that the telescopic bracket can support the expanded curtain, so that after the curtain is unfolded by the winding device, the curtain is kept in a flattened state by the telescopic bracket and the elastic component, therefore, the curtain can overcome the influence of gravity, the unfolding mode from bottom to top is realized, and the base can be placed on any platform without being hung on a ceiling.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a first schematic structural diagram of a curtain lifting mechanism according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a curtain lifting mechanism according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a curtain lifting mechanism according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a curtain lifting mechanism according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a curtain lifting mechanism according to an embodiment of the present application;
fig. 6 is a first schematic structural diagram of a telescopic bracket provided in an embodiment of the present application;
fig. 7 is a schematic structural diagram six of a curtain lifting mechanism provided in the embodiment of the present application;
fig. 8 is a schematic structural diagram of a second telescopic bracket provided in the embodiment of the present application;
fig. 9 is a schematic structural diagram three of a telescopic bracket provided in the embodiment of the present application;
fig. 10 is a schematic structural diagram of a fourth telescopic bracket provided in the embodiment of the present application;
fig. 11 is a schematic structural diagram five of a telescopic bracket provided in the embodiment of the present application;
fig. 12 is a seventh schematic structural diagram of a curtain lifting mechanism provided in the embodiment of the present application;
fig. 13 is an eighth schematic structural diagram of a curtain lifting mechanism according to an embodiment of the present application;
fig. 14 is a schematic structural diagram nine of a curtain lifting mechanism provided in the embodiment of the present application;
fig. 15 is a schematic structural diagram ten of a curtain lifting mechanism provided in the embodiment of the present application;
fig. 16 is an eleventh schematic structural diagram of a curtain lifting mechanism provided in the embodiment of the present application;
fig. 17 is a first schematic structural diagram of a projection apparatus according to an embodiment of the present application;
fig. 18 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application.
Detailed Description
Referring to fig. 1 and 2, an embodiment of the present application provides a curtain lifting mechanism 100, where the curtain lifting mechanism 100 includes a base 10, a winding device 20, a curtain 30, and a folding device 40. The winding device 20 is mounted on the base 10, and the curtain 30 has a first edge 31 and a second edge 32 disposed opposite the first edge 31. The first edge 31 is connected to the winding device 20, and the winding device 20 can wind the curtain 30 through the first edge 31. The folding device 40 includes a telescopic bracket 41 and an elastic component 43, the telescopic bracket 41 is connected to the base 10 and the second edge 32 of the curtain 30, and the telescopic bracket 41 can be retracted or extended relative to the base 10 to drive the second edge 32 to approach or leave the base 10. The elastic component 43 is elastically connected to the retractable bracket 41 to provide an elastic force for the retractable bracket 41 to expand relative to the base 10, so that the curtain 30 can be kept flat after being expanded.
The curtain cloth 30 is connected to the base 10 through the winding device 20 and the folding device 40, wherein two using states of the curtain 30, namely, the curtain cloth 30 can be rolled and unfolded, can be realized through the winding device 20, the folding device 40 comprises a telescopic bracket 41 and an elastic component 43, the telescopic bracket 41 is connected with the base 10 and the second edge 32 of the curtain cloth 30, the elastic component 43 is elastically connected with the telescopic bracket 41 to provide elastic force for the telescopic bracket 41 to unfold relative to the base 10, so that the telescopic bracket 41 can support the unfolded curtain cloth 30, after the curtain cloth 30 is unfolded through the winding device 20, the curtain cloth 30 is kept in a flat state through the telescopic bracket 41 and the elastic component 43, therefore, the curtain cloth 30 can overcome the influence of gravity, realize an unfolding mode from bottom to top, and then the base 10 can be placed on any platform, without being suspended from the ceiling.
Referring to fig. 1, 2 and 3, in this embodiment, the base 10 may be placed on any platform, such as a table, a floor, a counter, etc., and may be set according to actual needs. The retractable bracket 41 can be retracted or extended relative to the base 10, so as to drive the curtain 30 to be extended or retracted from the gravity direction, thereby realizing the downward-upward extending manner. The base 10 is provided with a groove 11, and after the telescopic bracket 41 drives the curtain 30 to contract relative to the base 10, the base 10 can accommodate the telescopic bracket 41 and the curtain 30 through the groove 11; the telescopic bracket 41 drives the curtain 30 relatively after the base 10 is unfolded, the base 10 can be right the telescopic bracket 41 and the curtain 30 are supported, so that the telescopic bracket 41 and the curtain 30 are erected on the platform, and a user can watch the curtain 30 conveniently. In other embodiments, the base 10 may also be installed on a ceiling, and the retractable bracket 41 drives the curtain 30 to expand or contract from the gravity direction, so as to realize a top-down expansion mode; alternatively, the base 10 may be mounted on a wall, and the retractable bracket 41 may drive the curtain 30 to expand or contract in the horizontal direction.
Referring to fig. 4, the winding device 20 includes a winding shaft 21 and a motor 22. The reel 21 is rotatably connected to the base 10. The spool 21 is the cavity tube-shape, motor 22 is tubular motor 22, motor 22 is fixed in inside the spool 21, motor 22 can drive the spool 21 is relative base 10 rotates, thereby drive curtain 30 convolute in the spool 21, perhaps relative the spool 21 expandes. In other embodiments, the motor 22 is fixed to the base 10 and is located outside the reel 21.
It can be understood that when the motor 22 drives the roller 21 to rotate relative to the base 10 along the first direction to wind the curtain 30, the area of the curtain 30 between the second edge 32 and the roller 21 becomes smaller, the roller 21 pulls the retractable bracket 41 to retract relative to the base 10 via the second edge 32 of the curtain 30, and finally the curtain 30 is completely wound on the roller 21, and the retractable bracket 41 is completely retracted in the base 10; when the motor 22 drives the roller 21 to rotate relative to the base 10 along the second direction to unfold the curtain 30, the unfolded area of the curtain 30 between the second edge 32 and the roller 21 becomes larger, the telescopic bracket 41 unfolds relative to the base 10 under the elastic action of the elastic component 43 and supports the unfolded curtain 30, so that the curtain 30 is kept in a flat state, the curtain 30 is prevented from swinging or being unfolded, and the curtain 30 can overcome the influence of gravity, thereby realizing an unfolding mode from bottom to top. The spreading area of the curtain 30 can be freely adjusted, the spreading ratio of the curtain 30 can be 40%, 60% or 100%, and the telescopic bracket 41 and the elastic component 43 can adapt to any spreading ratio of the curtain 30. Wherein the first direction is opposite to the second direction.
Referring to fig. 3 and 4, the curtain 30 is substantially rectangular, and the curtain 30 has a projection plane 33 and a back plane 34 opposite to the projection plane 33. Both the projection surface 33 and the rear surface 34 extend from the first edge 31 to the second edge 32. The curtain 30 can receive the projection light through the projection plane 33 to form a projection picture on the projection plane 33. The folding device 40 is disposed adjacent to the back side 34 such that the folding device 40 is hidden from the back side of the curtain 30 after the curtain 30 is unfolded relative to the base 10.
The telescopic bracket 41 is of a telescopic structure, one end of the telescopic bracket 41 is connected to the second edge 32 of the curtain 30, and the other end of the telescopic bracket 41 is connected to the base 10 and is disposed adjacent to the first edge 31 of the curtain 30. The telescopic bracket 41 can be expanded or contracted relative to the base 10. Elastic component 43 attaches to on the telescopic bracket 41, elastic component 43 provides telescopic bracket 41 is relative the elastic force that base 10 expanded makes telescopic bracket 41 provides the support to curtain 30 after expanding, guarantees that curtain 30 keeps the state of flattening out.
Referring to fig. 5, further, the retractable stand 41 includes a first folding assembly 411, a second folding assembly 422 disposed opposite to the first folding assembly 411, and a supporting beam 424, the first folding assembly 411 and the second folding assembly 422 are both connected to the base 10, the supporting beam 424 is fixed to the second edge 32, and two ends of the supporting beam 424 are respectively connected to the first folding assembly 411 and the second folding assembly 422, so as to be retractable relative to the base 10 via the first folding assembly 411 and the second folding assembly 422.
In this embodiment, the support beam 424 extends along a straight line, and the support beam 424 is disposed parallel to the second edge 32. The first folding assembly 411 and the second folding assembly 422 are foldable structures. The first folding assembly 411 and the second folding assembly 422 are arranged side by side in a direction parallel to the extending direction of the supporting beam 424, and the first folding assembly 411 and the second folding assembly 422 are respectively connected to two ends of the supporting beam 424 to provide balanced support for the supporting beam 424 and prevent the supporting beam 424 from tilting in the horizontal direction; first folding subassembly 411 with second folding subassembly 422 follow balanced support is carried out to the both sides of curtain 30, guarantees the stability of curtain 30 avoids curtain 30 inclines on the horizontal direction. The folding direction of the first folding assembly 411 is perpendicular to the extending direction of the supporting beam 424, and the folding direction of the second folding assembly 422 is perpendicular to the extending direction of the supporting beam 424. The first folding assembly 411 and the second folding assembly 422 extend or contract in a direction perpendicular to the supporting beam 424, so as to drive the supporting beam 424 to extend or contract relative to the base 10, so as to drive the curtain 30 to extend or contract relative to the base 10. After the curtain 30 is contracted relative to the base 10, the curtain 30 is wound around the winding device 20 and is contained in the base 10, the first folding component 411 and the second folding component 422 are contracted in the groove 11 of the base 10, and the supporting beam 424 covers the groove 11 of the base 10 to play a role in dust prevention.
Referring to fig. 5 and 6, further, the first folding assembly 411 includes a first link 412 and a second link 415, one end of the first link 412 is rotatably connected to the base 10, one end of the second link 415 is rotatably connected to one end of the first link 412 away from the base 10, the other end of the second link 415 is rotatably connected to the support beam 424, the elastic assembly 43 is connected to the first link 412 and the second link 415, and the first link 412 can be unfolded relative to the second link 415 under the elastic action of the elastic assembly 43.
In this embodiment, the support beam 424 is substantially parallel to the plane of the base 10. When the telescopic bracket 41 is unfolded relative to the base 10, a gap is formed between the supporting beam 424 and the base 10, the first link 412 and the plane of the base 10 are arranged at an included angle, the second link 415 and the supporting beam 424 are arranged at an included angle, and a maximum opening angle is formed between the first link 412 and the second link 415. In a state where the first folding assembly 411 is contracted with respect to the base 10, the supporting beam 424 abuts against the base 10, the first link 412 is substantially parallel to the plane of the base 10, the second link 415 is substantially parallel to the supporting beam 424, a minimum opening angle is formed between the first link 412 and the second link 415, and the first link 412 and the second link 415 are substantially overlapped.
Referring to fig. 7, a first bearing 425 is disposed at one end of the first link 412 adjacent to the base 10, and the first link 412 is rotatably connected to the base 10 through the first bearing 425. The first bearing 425 may be a rolling bearing, and of course, the first bearing 425 may also be a bearing of other forms, and may be set according to actual needs. The base 10 is provided with a first rotating shaft base 12, and the first rotating shaft base 12 is provided with a first rotating shaft 13 rotatably engaged with the first bearing 425, so that the first link 412 can rotate smoothly relative to the base 10. A space is provided between the first rotating shaft base 12 and the back surface 34 of the curtain 30 to prevent the first link 412 from interfering with the curtain 30.
Referring to fig. 8, a second bearing 418 is disposed at one end of the first link 412 adjacent to the second link 415, and the second bearing 418 and the first bearing 425 are respectively disposed at two ends of the first link 412. The first link 412 is rotatably connected to the second link 415 via the second bearing 418. The second bearing 418 may be a rolling bearing, and of course, the second bearing 418 may also be a bearing in other forms, and may be set according to actual needs.
Referring to fig. 9, a third bearing 419 is disposed at an end of the second link 415 adjacent to the supporting beam 424, and the second link 415 is rotatably connected to the supporting beam 424 through the third bearing 419. The third bearing 419 may be a rolling bearing, and of course, the third bearing 419 may also be a bearing in other forms, and may be set according to actual needs. The support beam 424 is provided with a second rotation shaft base 426, and the second rotation shaft base 426 is provided with a second rotation shaft 427 rotatably engaged with the third bearing 419 so that the second link 415 can be rotated smoothly with respect to the support beam 424. A space is provided between the second shaft base 426 and the back surface 34 of the curtain 30 to prevent the second link 415 from interfering with the curtain 30.
In the present embodiment, the first link 412 and the second link 415 are straight rods. In other embodiments, the first link 412 and the second link 415 may be long rods with other shapes, for example, the first link 412 and the second link 415 may be arc-shaped rods.
Referring to fig. 10 and 11, the elastic assembly 43 includes a damping cylinder 44, a piston 54 and a flexible cord 49, the damping cylinder 44 is fixed to the first link 412, the piston 54 is in sliding fit and sealing fit with the damping cylinder 44, two ends of the flexible cord 49 are respectively connected to the piston 54 and the second link 415, and gas in the damping cylinder 44 is in a compressed state, so as to provide an elastic force for the piston 54 to contract relative to the damping cylinder 44, so that the piston 54 applies a pulling force to the second link 415 to expand relative to the first link 412 via the flexible cord 49. In other embodiments, the damping cylinder 44 may be fixed to the second link 415, and both ends of the flexible rope 49 are connected to the piston 54 and the first link 412, respectively.
Wherein, the damping cylinder 44 is in a long cylinder shape. The damping cylinder 44 may be fixed to the first link 412 by means of screws, welding, riveting, or the like. The damper cylinder 44 is provided with a first end 50 and a second end 51 disposed opposite the first end 50, and an air cavity 46 between the first end 50 and the second end 51. The air chamber 46 extends along the length of the damper cylinder 44. The first end 50 is disposed adjacent to the connection of the first link 412 and the second link 415. The second end 51 is disposed adjacent to the connection of the first link 412 and the base 10. The piston 54 is provided with a piston portion 52 and a connecting rod 53 fixedly connected to the piston portion 52. The piston portion 52 is received in the air cavity 46, and the piston portion 52 is in sealing and sliding engagement with the air cavity 46. The damping cylinder 44 applies a damping action to the piston portion 52 of the piston 54, enabling smooth sliding adjustment of the extension length of the piston 54 relative to the damping cylinder 44. The connecting rod 53 has one end passing through the first end 50 to connect to the piston portion 52 and the other end connecting to the flexible cord 49. The connecting rod 53 is extendable and retractable with respect to the damping cylinder 44 as the piston portion 52 slides with respect to the damping cylinder 44.
The damping cylinder 44 forms a sealed chamber 45 between the piston portion 52 to the first end 50, the sealed chamber 45 forming part of the air chamber 46. The seal chamber 45 is filled with compressed gas that provides the elastic force of the piston portion 52 toward the second end 51. The piston 54 applies a pulling force to the flexible string 49 under the elastic action of the compressed gas to provide a power for unfolding the second link 415 relative to the first link 412. And the extension length of the piston 54 relative to the damping cylinder 44 can be changed to adjust the compression degree of the compressed gas, so as to change the pulling force of the piston 54 on the flexible rope 49, wherein the larger the extension length of the piston 54 relative to the damping cylinder 44 is, the larger the gas pressure in the sealed cavity 45 is, and the larger the pulling force of the piston 54 on the flexible rope 49 is. In other embodiments, a spring may be used in place of the damping cylinder 44 and the piston 54. The sealed cavity 45 is filled with a gas-liquid mixture.
Since the plunger 54 always applies a pulling force to the flexible cord 49 so that the flexible cord 49 keeps adhering to the first link 412 and the second link 415, the bending angle of the flexible cord 49 and the angle of the first link 412 relative to the second link 415 are consistent. A space is provided between the portion of the flexible cord 49 attached to the second link 415 and the center of the rotating shaft of the second link 415, so that a rotating moment can be formed by the pulling force applied by the piston 54 to the second link 415 through the flexible cord 49, and a power for unfolding the second link 415 relative to the first link 412 is provided, so that after the curtain 30 is unfolded relative to the base 10, the second link 415 and the first link 412 can be automatically unfolded to support the curtain 30, and the curtain 30 can be ensured to be stably maintained in a flattened state. Moreover, since the length of the flexible rope 49 is kept constant, the connection rod 53 keeps fixed relative to the extending position of the damping cylinder 44, and the compression degree of the gas in the sealing chamber 45 is not changed, so that the connection rod 53 can apply a constant pulling force to the flexible rope 49 during the unfolding process of the curtain 30, and the curtain 30 can be unfolded smoothly. The elastic component 43 can spontaneously provide the telescopic power for the telescopic bracket 41 without using an external energy source.
The flexible rope 49 may be a steel wire rope, a nylon rope or other plastic rope, and may be set as required, which is not described herein again.
It is understood that the structure of the second folding assembly 422 may be substantially the same as the structure of the first folding assembly 411, and reference may be made to the above description of the first folding assembly 411. The curtain lifting mechanism 100 may include two sets of the elastic members 43. One set of the elastic elements 43 is disposed on the first folding element 411, and the other set of the elastic elements 43 is disposed on the second folding element 422. The connection of the elastic member 43 to the second folding member 422 can also be referred to as described above.
Referring to fig. 10 and 11, further, a first receiving groove 420 is formed between two ends of the first link 412, a second receiving groove 421 is formed between two ends of the second link 415, the damping cylinder 44 and the piston 54 are received in the first receiving groove 420, and an end of the flexible cord 49, which is far away from the contraction rod, is received in the second receiving groove 421.
In this embodiment, the first receiving groove 420 extends along the longitudinal direction of the first link 412. The second receiving groove 421 extends along a length direction of the second link 415. The second receiving groove 421 provides a receiving space for the damping cylinder 44 and the piston 54, so that the damping cylinder 44 and the piston 54 are hidden inside the first link 412, and the risk of damage to the damping cylinder 44 and the piston 54 can be reduced. One end of the flexible rope 49 is received in the first receiving groove 420 and connected to the piston 54, and the other end is received in the second receiving groove 421 and connected to the second link 415.
The first link 412 is provided with a first rotating shaft part 413 connected with the second link 415, and the first rotating shaft part 413 is provided with a first positioning groove 414 communicated with the first accommodating groove 420. The second link 415 has a second rotation shaft 416 rotatably connected to the first rotation shaft 413, and the second rotation shaft 416 has a second positioning groove 417 communicating with the second receiving groove 421. The flexible cord 49 is positioned and matched with the first positioning groove 414 and the second positioning groove 417, so that the position of the flexible cord 49 relative to the first link 412 and the second link 415 can be kept fixed, the acting direction of the flexible cord 49 on the second link 415 and the piston 54 can be kept constant, and the reliability of the curtain lifting mechanism 100 can be ensured.
The second shaft portion 416 is in the shape of a bent rod. The second shaft portion 416 has one end rotatably connected to the first shaft portion 413 and the other end extending in a direction away from the first shaft portion 413. The second positioning groove 417 is located on an outer peripheral side of the second rotation shaft portion 416, a gap is provided between an extending direction of the second positioning groove 417 and a rotation shaft center of the second rotation shaft portion 416, and the flexible cord 49 is in positioning fit with the second positioning groove 417, and can maintain a gap with the rotation shaft center of the second rotation shaft portion 416, so that the flexible cord 49 provides a rotation torque for the second link 415 to unfold relative to the first link 412.
Referring to fig. 12 and 13, in another embodiment, the second folding assembly 422 includes a third link 423 and a fourth link 424, one end of the third link 423 is rotatably connected to the base 10, one end of the fourth link 424 is rotatably connected to one end of the third link 423 away from the base 10, the other end of the fourth link 424 is rotatably connected to the supporting beam 424, the first link 412, the second link 415, the third link 423 and the fourth link 424 are located in the same plane, and the elastic assembly 43 elastically connects the first link 412 and the third link 423 or elastically connects the second link 415 and the fourth link 424.
In this embodiment, the structure of the second folding assembly 422 may be substantially the same as that of the first folding assembly 411, and reference may be made to the above description of the first folding assembly 411. The length of the third link 423 is substantially the same as the length of the first link 412. The length of the fourth link 424 is substantially the same as the length of the second link 415. In the unfolded state of the curtain 30 relative to the base 10, the first link 412, the second link 415, the third link 423, and the fourth link 424 are substantially parallel to the curtain 30, the first link 412 and the third link 423 form a maximum included angle, and the second link 415 and the fourth link 424 form a maximum included angle. In a retracted state of the curtain 30 relative to the base 10, the first link 412 and the third link 423 are substantially collinear, and the second link 415 and the fourth link 424 are substantially collinear.
Referring to fig. 12, in one embodiment, the elastic element 43 elastically connects the first link 412 and the third link 423. In this embodiment, the elastic assembly 43 applies an elastic force to the first link 412 and the second link 415 to move away from each other, so as to provide a power for unfolding the first link 412 and the second link 415. When the curtain 30 is retracted relative to the base 10, the first link 412 and the second link 415 are substantially collinear, and the elastic assembly 43 is in a compressed state; in the unfolded state of the curtain 30 relative to the base 10, the first link 412 and the third link 423 are unfolded under the elastic action of the elastic assembly 43 to form an included angle, and the second link 415 and the fourth link 424 are also unfolded to form an included angle respectively following the first link 412 and the third link 423.
Referring to fig. 13, in another embodiment, the elastic component 43 elastically connects the second link 415 and the fourth link 424. In this embodiment, the elastic assembly 43 applies an elastic force to the second link 415 and the fourth link 424 to move away from each other, so as to provide a power for unfolding the second link 415 and the fourth link 424. When the curtain 30 is retracted relative to the base 10, the second link 415 and the fourth link 424 are substantially collinear, and the elastic assembly 43 is in a compressed state; in the unfolded state of the curtain 30 relative to the base 10, the second link 415 and the fourth link 424 are unfolded by the elastic force of the elastic assembly 43 to form an included angle, and the first link 412 and the third link 423 are also respectively unfolded to form an included angle following the second link 415 and the fourth link 424.
The elastic component 43 can apply the same elastic action to the first folding component 411 and the second folding component 422, so as to ensure that the first folding component 411 and the second folding component 422 are stressed evenly, and realize the synchronous expansion and contraction process.
Referring to fig. 14, further, the elastic assembly 43 includes a damping cylinder 44, a first piston 55 and a second piston 56, the damping cylinder 44 is provided with a first air chamber 47 and a second air chamber 48 at opposite sides thereof, the first piston 55 is in sliding fit and sealing fit with the first air chamber 47, the second piston 56 is in sliding fit and sealing fit with the second air chamber 48, and the gas in the first air chamber 47 and the second air chamber 48 is in a compressed state, so as to provide an elastic force for the first piston 55 and the second piston 56 to extend relative to the damping cylinder 44.
In the present embodiment, the structure of the first piston 55 and the second piston 56 can refer to the description of the structure of the piston 54. The mating structure of the first piston 55 and the first air chamber 47 can refer to the above description of the mating structure of the piston 54 and the air chamber 46; the mating arrangement of second piston 56 with second air cavity 48 may be as described above with respect to the mating arrangement of piston 54 with air cavity 46. The end of the first piston 55 remote from the damping cylinder 44 is rotatably connected to the first folding assembly 411. The end of the second piston 56 remote from the damper cylinder 44 is pivotally connected to the second folding assembly 422. The damper cylinder 44 has a first end 50 and a second end 51 disposed opposite the first end 50. The first air chamber 47 extends from the first end 50 toward the second end 51. The second air cavity 48 extends from the second end 51 toward the first end 50. The first piston 55 extends into the first air chamber 47 through the first end 50. The second piston 56 extends into the second air chamber 48 through the second end 51.
Referring to fig. 14 and 15, in a state that the curtain 30 is retracted relative to the base 10, the first link 412 and the third link 423 are located on the same straight line, the sliding direction of the first piston 55 and the first link 412 are disposed at an acute angle, the sliding direction of the second piston 56 and the third link 423 are disposed at an acute angle, and a resultant direction of a thrust of the first piston 55 against the first link 412 and a thrust of the second piston 56 against the third link 423 faces the supporting beam 424, so that when the curtain 30 is unwound by the winding device 20, the retractable bracket 41 is automatically unwound relative to the base 10 by the thrust of the elastic component 43 to support the curtain 30.
Referring to fig. 16, further, an orthographic projection of the first air cavity 47 on the support beam 424 is at least partially overlapped with an orthographic projection of the second air cavity 48 on the support beam 424. In this embodiment, the damping cylinder 44 is located in the plane of the telescopic bracket 41, the damping cylinder 44 is located between the first folding component 411 and the second folding component 422, and the damping cylinder 44 can be accommodated in the groove 11 of the base 10 along with the first folding component 411 and the second folding component 422. The first air chamber 47 and the second air chamber 48 are arranged side by side in the direction perpendicular to the length direction of the support beam 424, so that the size of the damping cylinder 44 in the length direction of the support beam 424 can be reduced, thereby providing sufficient arrangement space for arranging the first folding assembly 411 and the second folding assembly 422, and facilitating to increase the height of the telescopic bracket 41 which is expanded relative to the base 10.
Referring to fig. 17 and fig. 18, an embodiment of the present application provides a projection apparatus 200, where the projection apparatus 200 includes a projection device 70 and a curtain lifting mechanism 100 as described above. The curtain lifting mechanism 100 can refer to the foregoing description. The projection device 70 is fixed inside the base 10, the projection device 70 is provided with a projection lens 71, the projection lens 71 is spaced from the curtain 30, and the projection lens 71 can project images onto the curtain 30. The projection area of the projection lens 71 coincides with the expansion area of the curtain 30, and the projection light emitted by the projection lens 71 can be projected on the expanded curtain 30. The projection apparatus 200 further includes a circuit board 72 and a speaker 73, the circuit board 72 and the speaker 73 are fixed inside the base 10, and the circuit board 72 electrically connects the projection device 70 and the speaker 73 to control the projection device 70 and the speaker 73 to operate. The circuit board 72 can control the projection lens 70 to project pictures on the curtain 30, and can also control the speaker 73 to play sound.
The curtain lifting mechanism and the projection equipment provided by the embodiment of the application are connected with the base through the winding device and the folding device, wherein, the two using states of the curtain curling and the curtain unfolding can be realized through the winding device, the folding device comprises a telescopic bracket and an elastic component, wherein the telescoping support connects the base and the second edge of the curtain, the elastic assembly is resiliently connected to the telescoping support, so as to provide the elastic force for the expansion of the telescopic bracket relative to the base, so that the telescopic bracket can support the expanded curtain, so that after the curtain is unfolded by the winding device, the curtain is kept in a flattened state by the telescopic bracket and the elastic component, therefore, the curtain can overcome the influence of gravity, the unfolding mode from bottom to top is realized, and the base can be placed on any platform without being hung on a ceiling.
In summary, although the present application has been described with reference to the preferred embodiments, the present application is not limited to the preferred embodiments, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, so that the scope of the present application is defined by the appended claims.
Claims (10)
1. A curtain lifting mechanism is characterized in that the curtain lifting mechanism comprises a base, a winding device, a curtain and a folding device, the winding device is mounted on the base, the curtain is provided with a first edge and a second edge arranged opposite to the first edge, the first edge is connected to the winding device, the winding device can wind the curtain through the first edge, the folding device comprises a telescopic bracket and an elastic component, the telescopic bracket is connected with the base and the second edge of the curtain and can be contracted or extended relative to the base, so as to drive the second edge to be close to or far away from the base, the elastic component is elastically connected with the telescopic bracket, so as to provide the elastic force for the expansion of the telescopic bracket relative to the base, so that the curtain keeps flat after being expanded.
2. The curtain lifting mechanism as recited in claim 1, wherein the telescoping support comprises a first folding assembly and a second folding assembly disposed opposite the first folding assembly, and a support beam, the first folding assembly and the second folding assembly each coupled to the base, the support beam secured to the second edge, the support beam coupled at each end to the first folding assembly and the second folding assembly, respectively, for telescoping relative to the base via the first folding assembly and the second folding assembly.
3. The curtain raising and lowering mechanism as recited in claim 2, wherein the first folding assembly includes a first link pivotally connected at one end to the base and a second link pivotally connected at one end to the first link at a position away from the base and at another end to the support beam, and the elastic assembly is connected to the first link and the second link, the first link being extendable relative to the second link under the elastic force of the elastic assembly.
4. The curtain lifting mechanism as recited in claim 3, wherein the elastic assembly comprises a damping cylinder, a piston and a flexible rope, the damping cylinder is fixed to the first link rod, the piston is in sliding fit and sealing fit with the damping cylinder, two ends of the flexible rope are respectively connected with the piston and the second link rod, and gas in the damping cylinder is in a compressed state and provides elastic force for the piston to contract relative to the damping cylinder, so that the piston applies tensile force to the second link rod relative to the first link rod through the flexible rope.
5. Curtain lifting mechanism as claimed in claim 4, wherein the first link has a first receiving slot between its ends and the second link has a second receiving slot between its ends, the damping cylinder and the piston being received in the first receiving slot and the end of the flexible cord remote from the retraction rod being received in the second receiving slot.
6. The curtain lifting mechanism as claimed in claim 5, wherein the first link has a first shaft portion connected to the second link, the first shaft portion has a first positioning groove communicating with the first receiving groove, the second link has a second shaft portion rotatably connected to the first shaft portion, the second shaft portion has a second positioning groove communicating with the second receiving groove, and the flexible cord is engaged with the first positioning groove and the second positioning groove.
7. The curtain lifting mechanism as claimed in claim 3, wherein the second folding assembly comprises a third link and a fourth link, the third link is pivotally connected to the base at one end, the fourth link is pivotally connected to the third link at an end away from the base at one end, the support beam is pivotally connected at another end, the first link, the second link, the third link and the fourth link are located in the same plane, and the elastic assembly elastically connects the first link and the third link or elastically connects the second link and the fourth link.
8. The curtain lifting mechanism as recited in claim 7, wherein the elastic assembly includes a damping cylinder, a first piston and a second piston, the damping cylinder is provided with a first air chamber and a second air chamber on opposite sides thereof, the first piston is in sliding fit and sealing fit with the first air chamber, the second piston is in sliding fit and sealing fit with the second air chamber, and the air in the first air chamber and the second air chamber is in a compressed state to provide an elastic force for the first piston and the second piston to extend relative to the damping cylinder.
9. Curtain lifting mechanism as claimed in claim 8, characterized in that the orthographic projection of the first air chamber on the support beam is at least partially superimposed on the orthographic projection of the second air chamber on the support beam.
10. A projection apparatus, comprising a projection device and a curtain lifting mechanism as claimed in any one of claims 1 to 9, wherein the projection device is fixed to the base, the projection device is provided with a projection lens, the projection lens is spaced from the curtain, and the projection lens can project an image onto the curtain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910939698.6A CN110647003A (en) | 2019-09-29 | 2019-09-29 | Curtain lifting mechanism and projection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910939698.6A CN110647003A (en) | 2019-09-29 | 2019-09-29 | Curtain lifting mechanism and projection equipment |
Publications (1)
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| CN110647003A true CN110647003A (en) | 2020-01-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910939698.6A Pending CN110647003A (en) | 2019-09-29 | 2019-09-29 | Curtain lifting mechanism and projection equipment |
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| CN (1) | CN110647003A (en) |
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| CN111251753A (en) * | 2020-01-17 | 2020-06-09 | 深圳市凯博特科技有限公司 | Erasable and projectable posted white board film |
| CN111263105A (en) * | 2020-02-18 | 2020-06-09 | 常小兵 | Video conference projection frame |
| CN111624845A (en) * | 2020-05-18 | 2020-09-04 | 青岛海信激光显示股份有限公司 | Projection screen or display screen |
| CN112666784A (en) * | 2021-01-14 | 2021-04-16 | 北京字节跳动网络技术有限公司 | Projection screen device |
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| CN113296332A (en) * | 2021-05-11 | 2021-08-24 | 通化师范学院 | Portable background curtain for programming and guiding broadcast television |
| CN113406853A (en) * | 2020-03-16 | 2021-09-17 | 青岛海信激光显示股份有限公司 | Laser projection device |
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| CN113470446A (en) * | 2021-06-18 | 2021-10-01 | 贾振强 | Multimedia teaching equipment is used in business administration teaching |
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