Folding screen with automatic tray lift

Abstract

The present invention discloses a folding screen with automatic tray lifting, comprising: a support frame, a folding screen assembly with the top suspended on the support frame, a tray located below the folding screen assembly, and a power mechanism driving the tray to lift and move; the folding screen assembly comprises a plurality of screen units arranged from top to bottom, the edges of two adjacent screen units are flexibly connected, the folding screen assembly is gradually stacked on the tray when the tray rises, and the folding screen assembly is gradually unfolded when the tray descends. The present invention arranges a tray below the folding screen assembly, and uses the lifting and lowering movement of the tray to control the distance between the tray and the support frame. When the distance increases, the folding screen assembly automatically unfolds under the action of gravity, and when the distance decreases, the folding screen assembly is stacked on the tray. The power mechanism only needs to drive the tray to move to realize the unfolding or folding of the folding screen assembly, and the structure is simple and reliable, and easy to assemble and maintain.

Description

Technical Field

[0001] The present invention relates to the technical field of display devices, and in particular to a folding screen with automatic tray lifting. Background Art

[0002] With the continuous advancement of technology, folding screens have been widely used in daily life. The folding screens currently on the market are usually composed of multiple screen units flexibly connected, and their sizes can be flexibly designed. Large folding screens are usually used in outdoor environments to display advertisements or videos. Since the folding screen needs to be expanded or folded according to usage, the design of its driving structure is particularly important.

[0003] Folding screens that can control the folding or unfolding state have appeared in the prior art. They use structures such as screws, nuts, and rails to drive the folding screen to unfold from top to bottom. This driving structure uses many parts and has low reliability. It is not only costly and difficult to assemble, but also very difficult to repair after a failure.

[0004] Therefore, how to design a folding screen with a simple and reliable structure is a technical problem that the industry urgently needs to solve. Summary of the invention

[0005] In order to solve the defects of complex driving structure and low reliability in the prior art, the present invention proposes a folding screen with automatic tray lifting, which is folded or unfolded with the lifting movement of the tray, and has a simple, reliable and low-cost driving structure.

[0006] The technical solution adopted by the present invention is to design a folding screen with automatic tray lifting, including: a support frame, a folding screen assembly suspended on the top of the support frame, a tray located below the folding screen assembly, and a power mechanism for driving the tray to lift and move; the folding screen assembly includes a plurality of screen units arranged from top to bottom, and the edges of two adjacent screen units are flexibly connected. When the tray rises, the folding screen assembly is gradually stacked on the tray, and when the tray descends, the folding screen assembly is gradually unfolded.

[0007] Among them, signal lines and power lines connecting all screen units are arranged on both sides of the folding screen assembly, and the signal lines and the power lines are folded as the folding screen assembly is folded. Both sides of each screen unit are provided with wire barrels for the signal lines and the power lines to pass through. The screen unit is composed of a plurality of sub-screens arranged from left to right, and the sub-screens are connected to the signal lines and the power lines through cables. A gap for accommodating the cables is provided between two adjacent screen units, and the gap is located on the back of the folding screen assembly.

[0008] Preferably, the power mechanism is composed of at least one winch assembly, which includes: at least one winch mounted on a support frame, a lanyard wound around the winch, and a motor driving the winch to rotate, the bottom end of the lanyard is fixed on a pallet, and the pallet rises or falls with the rotation of the winch.

[0009] In one embodiment, a winch assembly is provided on each side of the pallet, and the motors of all the winch assemblies operate synchronously.

[0010] Preferably, the folding screen further comprises: a detection device for detecting the height of the tray, and the working state of the power mechanism is controlled by the detection device.

[0011] Preferably, the detection device includes: at least one upper limit detection device and at least one lower limit detection device, the upper limit detection device controls the power mechanism to stop rotating when the pallet rises to the upper limit position, and the lower limit detection device controls the power mechanism to stop rotating when the pallet descends to the lower limit position.

[0012] Preferably, when the number of upper limit detection devices is more than two, the upper limit detection devices are connected in series or in parallel; and / or when the number of lower limit detection devices is more than two, the lower limit detection devices are connected in series or in parallel.

[0013] In one embodiment, the upper limit detection device includes: an upper limit switch fixedly connected to the support frame, and a bumper that moves along with the lifting of the tray, and the tray stops moving when the bumper touches the upper limit switch. The lower limit detection device includes: a lower limit switch fixedly installed at the bottom of the tray, and a connecting rope connected between the bottom of the folding screen assembly and the lower limit switch, and the tray stops moving when the connecting rope pulls the lower limit switch when it descends.

[0014] Compared with the prior art, the present invention arranges a tray under the folding screen assembly and utilizes the lifting movement of the tray to control the distance between the tray and the support frame. When the distance becomes larger, the folding screen assembly unfolds itself under the action of gravity, and when the distance becomes smaller, the folding screen assembly is stacked on the tray. The power mechanism only needs to drive the tray to move to achieve the unfolding or folding of the folding screen assembly. The structure is simple and reliable, and it is easy to assemble and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is described in detail below with reference to the embodiments and accompanying drawings, wherein:

[0016] Figure 1 is a schematic diagram of the back side of the folding screen assembly of the present invention when half of it is folded;

[0017] Figure 2 is a front view of the folding screen assembly of the present invention with half of it folded;

[0018] Figure 3This is a schematic diagram of the back of the folding screen assembly of the present invention when it is fully unfolded

[0019] Figure 4 is a front view schematic diagram of the folding screen assembly of the present invention when it is fully unfolded;

[0020] Figure 5 is a bottom view schematic diagram of the folding screen assembly of the present invention being fully folded;

[0021] Figure 6 is a schematic top view of a foldable screen assembly in an embodiment of the present invention when it is fully folded;

[0022] Figure 7 is a top view schematic diagram of another embodiment of the present invention in which the folding screen assembly is fully folded;

[0023] Figure 8 yes Figure 5 The enlarged schematic diagram of point A in the middle;

[0024] Fig. 9 yes Figure 5 The enlarged schematic diagram of point B in the middle;

[0025] Fig.10 yes Figure 3 Enlarged schematic diagram of point C in the middle. DETAILED DESCRIPTION

[0026] like Figure 1 , 2 As shown, the folding screen proposed in the present invention includes: a support frame 1, a folding screen assembly 2, a tray 3 and a power mechanism. The support frame 1 can be fixed on a structure such as a wall or a roof. The support frame 1 bears the weight of the entire folding screen. A fixing plate 4 is fixed on the top of the folding screen assembly 2. The fixing plate 4 is suspended on the support frame 1 through a plurality of fixing ropes 5. The tray 3 is located below the folding screen assembly 2. The tray 3 is driven to rise and fall by the power mechanism, and the folding or unfolding of the folding screen assembly 2 is achieved through the lifting and lowering movement of the tray 3.

[0027] Specifically, the folding screen assembly 2 includes a plurality of screen units 21 arranged from top to bottom, and each screen unit 21 is composed of a plurality of sub-screens arranged from left to right. The sub-screens are LED screens, and the edges of the two upper and lower adjacent screen units 21 are flexibly connected. There are many ways of flexible connection. For example, the edges of the two adjacent screen units 21 are connected by steel wires, hinges or hinges, so that the two adjacent screen units 21 can be folded at the flexible connection. When the tray 3 rises, the distance between the tray 3 and the support frame 1 becomes smaller, and the screen units 21 of the folding screen assembly 2 are gradually stacked on the tray 3. When the tray 3 descends, the distance between the tray 3 and the support frame 1 becomes larger, and the screen units 21 of the folding screen assembly 2 unfold themselves under the action of gravity. The folding screen of the present invention only needs to drive the tray 3 to move to realize the unfolding or folding of the folding screen assembly 2, with fewer parts and high reliability.

[0028] like Figures 1 to 4 As shown, the two sides of the folding screen assembly 2 are provided with signal lines and power lines connecting all the screen units 21. Both the signal lines and the power lines are flexible cables. The cables fold as the folding screen assembly 2 folds. In order to make the cables on both sides of the folding screen assembly 2 neater, the left and right sides of each screen unit 21 are designed for the cables to pass through the wire barrels. The cables are constrained in the wire barrels and will not get hooked or entangled, ensuring that the folding and unfolding of the folding screen assembly 2 is smooth and unobstructed. An electric control box 6 is installed on each side of the top of the support frame 1. The signal line and the power line are led out of the electric control box 6. The sub-screen is connected to the signal line and the power line through the cable. A gap 22 is provided between the two adjacent screen units 21 above and below. The gap 22 is located on the back of the screen unit 21. The cable of the sub-screen is accommodated in the gap 22. The routing of the folding screen assembly 2 is smooth and does not affect the viewing effect on the front of the folding screen assembly 2.

[0029] Preferably, the power mechanism is composed of at least one winch assembly 7, which includes: at least one winch 71, a hanging rope 72 wound on the winch 71, and a motor 73 driving the winch 71 to rotate. The winch 71 and the motor 73 are both fixed on the support frame 1, and the bottom end of the hanging rope 72 is fixed on the pallet 3. When the winch 71 is rotated to release the hanging rope 72, the pallet 3 gradually descends, and when the winch 71 is rotated to retract the hanging rope 72, the pallet 3 gradually rises. It should be noted that when the power mechanism has more than two winch assemblies 7, the motors 73 of all winch assemblies 7 work synchronously to ensure that the pallet 3 always remains horizontal during the lifting process.

[0030] In one embodiment of the present invention, a winch assembly 7 is provided on each side of the tray 3, and two hanging ropes 72 are provided in the winch assembly 7. The two sides of the tray 3 are designed to be provided with hanging ears for fixing the hanging ropes 72. There are many structures of the winch assembly 7, for example, Figures 1 to 5As shown, the winch assembly 7 is provided with only one winch 71 and one motor 73. Two rope grooves are arranged at intervals on the winch 71. Two hanging ropes 72 are respectively wound in the corresponding rope grooves. The winch 71 is driven to rotate by the motor 73, so that the tray 3 moves up and down. Figure 6 As shown, the winch assembly 7 is provided with two independent winches 71 and a motor 73, the motor 73 is a double-headed motor, and the two hanging ropes 72 are respectively wound around the corresponding winches 71, and the two winches 71 are driven to rotate by the double-headed motor, so that the tray 3 moves up and down. Figure 7 As shown, the winch assembly 7 is provided with two winches 71 and a motor 73, the motor 73 is a reel motor, and the two hanging ropes 72 are respectively wound around the corresponding winches 71, and the two winches 71 are driven to rotate by the reel motor. It should be noted that when the width of the folding screen assembly 2 is very wide, a winch assembly 7 can be added in the middle, and multiple winch assemblies 7 can be synchronously controlled to rise and fall.

[0031] Furthermore, in order to improve the degree of automation of unfolding or folding the folding screen, the folding screen also includes: a detection device for detecting the height of the tray 3, the working state of the power mechanism is controlled by the detection device, and the detection device includes: at least one upper limit detection device and at least one lower limit detection device, the upper limit detection device sends a stop signal to the power mechanism when the tray 3 rises to the upper limit position, the power mechanism stops rotating, so that the tray 3 remains in the upper limit position, at this time, the top screen unit 21 in the folding screen assembly is in a suspended state, and the remaining screen units 21 are stacked on the tray 3, and the lower limit detection device sends a stop signal to the power mechanism when the tray 3 drops to the lower limit position, the power mechanism stops rotating, so that the tray 3 remains in the lower limit position, here all the screen units in the folding screen assembly are in a suspended state, and the entire folding screen assembly is fully unfolded.

[0032] In order to improve the accuracy of detection, the number of upper limit detection devices and lower limit detection devices can be designed to be multiple. When the number of upper limit detection devices is more than two, the upper limit detection devices are connected in series or in parallel. If all upper limit detection devices are connected in series, the power mechanism stops moving when all upper limit detection devices send a stop signal. If all upper limit detection devices are connected in parallel, the power mechanism stops moving when any upper limit detection device sends a stop signal. Similarly, when the number of lower limit detection devices is more than two, the lower limit detection devices are connected in series or in parallel, and their control logic is the same as that of the upper limit detection devices. If all lower limit detection devices are connected in series, the power mechanism stops moving when all lower limit detection devices send a stop signal. If all lower limit detection devices are connected in parallel, the power mechanism stops moving when any lower limit detection device sends a stop signal.

[0033] like Figure 8As shown, in one embodiment of the present invention, the upper limit detection device includes: an upper limit switch 8 and a bumper 9. A mounting plate is provided on the support frame 1 or the winch 71, the upper limit switch 8 is fixed on the mounting plate, the bumper 9 is fixed on the hanging rope 72, and the bumper 9 is located directly below the corresponding upper limit switch 8. When the winch 71 rotates to retract the hanging rope 72, the hanging rope 72 pulls the tray 3 up, and the bumper 9 moves with the tray 3. After the bumper 9 hits the upper limit switch 8 above it, the upper limit switch 8 is triggered to send a stop signal to the motor 73 connected thereto, and the motor 73 stops rotating, so that the tray 3 remains at the upper limit position.

[0034] like Fig. 9 , 10 As shown, the lower limit detection device includes: a lower limit switch 10, which is fixedly mounted on the bottom of the tray 3, a load-bearing bar is mounted on the bottom of the folding screen assembly 2, a connecting rope 11 is connected between the lower limit switch 10 and the load-bearing bar, and a through hole for the connecting rope 11 to pass through is provided on the tray 3. When the winch 71 rotates to release the hanging rope 72, the tray 3 descends under the action of gravity, and after the folding screen assembly 2 is fully unfolded, the tray 3 continues to move downward while the load-bearing bar remains stationary, and the connecting rope 11 gradually tightens and pulls the lower limit switch 10, and the lower limit switch 10 is triggered to send a stop signal to the motor 73 connected thereto, and the motor 73 stops rotating, so that the tray 3 remains at the lower limit position.

[0035] Each motor 73 is equipped with at least one upper limit switch 8 and one lower limit switch 10, and each upper limit switch 8 is equipped with a collision block 9. When there are more than two upper limit switches 8, it should be ensured that when the tray 3 rises horizontally to the upper limit position, all the collision blocks 9 hit the upper limit switch 8. Similarly, each lower limit switch 10 is equipped with a connecting rope 11. When there are more than two lower limit switches 10, it should be ensured that when the tray 3 falls horizontally to the lower limit position, all the connecting ropes 11 pull the lower limit switch 10.

[0036] The present invention can realize the unfolding or folding of the folding screen assembly, has a simple and reliable structure, is easy to assemble and maintain, and has a low failure rate and a long service life.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Automatic tray lifting folding screen, characterized by, include: A support frame, a folding screen assembly suspended on the support frame, a tray located below the folding screen assembly, a power mechanism for driving the tray to move up and down, and a detection device for detecting the height of the tray, wherein the working state of the power mechanism is controlled by the detection device; The folding screen assembly comprises a plurality of screen units arranged from top to bottom, the edges of two adjacent screen units are flexibly connected, and when the tray rises, the folding screen assembly is gradually stacked on the tray, and when the tray descends, the folding screen assembly is gradually unfolded; The detection device comprises: at least one upper limit detection device and at least one lower limit detection device, wherein the upper limit detection device controls the power mechanism to stop rotating when the pallet rises to the upper limit position, and the lower limit detection device controls the power mechanism to stop rotating when the pallet descends to the lower limit position; The lower limit detection device includes: a lower limit switch fixedly installed on the bottom of the tray, and a connecting rope connected between the bottom of the folding screen assembly and the lower limit switch. The tray stops moving when it descends to the point where the connecting rope pulls the lower limit switch.

2. The folding screen according to claim 1, characterized in that: The power mechanism is composed of at least one winch assembly, which includes: at least one winch installed on the support frame, a hanging rope wound around the winch, and a motor driving the winch to rotate, the bottom end of the hanging rope is fixed on the pallet, and the pallet rises or falls with the rotation of the winch.

3. The folding screen according to claim 2, characterized in that: A winch assembly is respectively arranged on both sides of the tray, and the motors of all the winch assemblies work synchronously.

4. The folding screen according to claim 1, characterized in that: When the number of the upper limit detection devices is more than two, the upper limit detection devices are connected in series or in parallel; and / or when the number of the lower limit detection devices is more than two, the lower limit detection devices are connected in series or in parallel.

5. The folding screen according to claim 1, characterized in that: The upper limit detection device includes: an upper limit switch fixedly connected to the support frame, and a collision block following the lifting movement of the pallet, and the pallet stops moving when the collision block touches the upper limit switch when the pallet rises.

6. The folding screen according to any one of claims 1 to 5, characterized in that: Signal lines and power lines connecting all the screen units are provided on both sides of the folding screen assembly. The signal lines and the power lines are folded as the folding screen assembly is folded. Wire passing barrels for the signal lines and the power lines to pass through are provided on both sides of each screen unit.

7. The folding screen according to claim 6, characterized in that: The screen unit is composed of a plurality of sub-screens arranged from left to right, and the sub-screens are connected to the signal line and the power line via cables. A gap for accommodating the cable is provided between two adjacent screen units, and the gap is located on the back of the folding screen assembly.

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