CN114017643B

CN114017643B - Movable conference screen

Info

Publication number: CN114017643B
Application number: CN202111420532.7A
Authority: CN
Inventors: 黄丹; 李飞云; 安立昆; 莫景莲; 秦莲燕; 周明; 王建卫; 黄仁萍
Original assignee: GUILIN HIVISION TECHNOLOGY CO LTD
Current assignee: GUILIN HIVISION TECHNOLOGY CO LTD
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2023-05-23
Anticipated expiration: 2041-11-26
Also published as: CN114017643A

Abstract

The invention provides a movable conference screen, which comprises a display screen and a bracket, wherein a roller is arranged at the bottom of the bracket, and an electromagnetic brake for braking the roller is arranged on the roller; when the roller is in a non-braking state and the moving speed of the bracket is zero, the electromagnetic brake locks the roller so that the roller enters a braking state; when the roller is in a braking state and the display screen is subjected to the action of external force parallel to the length direction of the display screen, the electromagnetic brake unlocks the roller to release the braking state of the roller. The roller of the movable conference screen is very convenient and intelligent in an adopted control mode when being locked or unlocked.

Description

Movable conference screen

Technical Field

The invention relates to the technical field of displays, in particular to a movable conference screen.

Background

Compared with the traditional projection equipment, the conference screen has more abundant functions and is very convenient to operate. For convenient movement, rollers are mounted at the bottom of the conference screen. The roller of the conference screen is usually provided with a brake device, and when the conference screen is parked at a corresponding position, related personnel need to operate the brake device on the roller by hands or feet to enable the roller to enter a braking state, so that the conference screen is prevented from moving due to the fact that the gradient exists on the ground.

The existing brake device on the conference screen is very troublesome to use, and each time the brake is braked or released, the brake device is operated by hands or feet, so that the problem of time and labor waste exists.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a movable conference screen which is used for solving the problems in the prior art.

To solve the above problems, the present invention provides: the movable conference screen comprises a display screen and a bracket, wherein a roller is arranged at the bottom of the bracket, and an electromagnetic brake for braking the roller is arranged on the roller;

when the roller is in a non-braking state and the moving speed of the bracket is zero, the electromagnetic brake locks the roller so that the roller enters a braking state;

when the roller is in a braking state and the display screen is subjected to the action of external force parallel to the length direction of the display screen, the electromagnetic brake unlocks the roller to release the braking state of the roller.

Further, the display screen is slidably arranged on the bracket, wherein the sliding direction of the display screen relative to the bracket is parallel to the length direction of the display screen;

when the roller is in a braking state and the display screen and the bracket slide relatively, the display screen is judged to be acted by external force parallel to the length direction of the display screen.

Further, the movable conference screen comprises a sliding detection module, and the sliding detection module is used for detecting whether relative sliding occurs between the display screen and the bracket.

Further, the sliding detection module comprises a Hall sensor and a magnet;

the Hall sensor is fixedly arranged on the display screen, the magnet is fixedly arranged on the support, and the Hall sensor is used for detecting the position change of the magnet.

Further, the movable conference screen comprises an elastic reset piece;

when the display screen and the support slide relatively to each other so that position change occurs between the display screen and the support, the elastic reset piece is used for providing elastic force for driving the display screen and the support to reset.

Further, the elastic restoring member includes a spring.

Further, a reminding module is arranged on the support, and when the moving speed of the support is greater than a set value, the reminding module sends out a speed reminding signal.

Further, the reminding module is a sound player.

Further, obstacle detection modules are arranged on two sides of the length direction of the display screen, and the obstacle detection modules are used for detecting the distance between the side surface of the display screen and an obstacle.

Further, the obstacle detection module is an ultrasonic ranging sensor, a laser ranging sensor or an infrared ranging sensor.

The beneficial effects of the invention are as follows: a movable conference screen comprises a display screen and a support, wherein rollers are arranged at the bottoms of the support, and electromagnetic brakes are arranged on the rollers. When the set condition is met, the roller is locked or unlocked through the electromagnetic brake.

The roller of the movable conference screen is very convenient and intelligent in an adopted control mode when being locked or unlocked.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a first isometric view of a movable conference screen;

fig. 2 shows a second side view of a movable conference screen;

FIG. 3 shows a block diagram of the connection of the relevant modules in a mobile conference screen;

FIG. 4 shows a schematic back view of a display screen;

FIG. 5 shows a schematic view of a stent;

FIG. 6 shows a partial enlarged view of FIG. 5;

fig. 7 shows a side view of a movable conference screen;

fig. 8 shows a back view of a movable conference screen.

Description of main reference numerals:

1-a display screen; 11-a first connection; 12-a second connection; 2-a bracket; 21-a first rail; 22-a second cross bar; 23-a first longitudinal bar; 24-a second longitudinal bar; 25-supporting leg groups; 251-first support leg; 252-second support feet; 253—a support surface; 254-roller; 26-elastic restoring element; 261-a first fixed block; 262-a second fixed block; 3-rolling wheels; 40-electromagnetic brake; 41-a control module; 42-a status indication module; 43-speed sensor; 44-a slip detection module; 441-hall sensor; 442-magnet; 45-reminding module; 46-obstacle detection module.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Examples

Referring to fig. 1 and 2, in the present embodiment, a movable conference screen is provided, which includes a display screen 1 and a bracket 2, and a roller 3 is disposed at the bottom of the bracket 2.

In order to realize automatic control of the braking state of the roller 3, an electromagnetic brake 40 for braking the roller 3 is provided on the roller 3.

In the present embodiment, when the moving speed of the carriage 2 is zero in the non-braking state of the roller 3, the electromagnetic brake 40 locks the roller 3 to bring the roller 3 into the braking state;

when the display 1 is subjected to an external force parallel to the length direction of the display when the roller 3 is in a braking state, the electromagnetic brake 40 unlocks the roller 3 to release the braking state of the roller 3.

When the user moves the movable conference screen to a desired position, the movement of the stand 2 needs to be stopped, and even if the movement speed of the stand 2 becomes zero, the roller 3 automatically enters a braking state from a non-braking state by the electromagnetic brake 40. The connection between the roller 3 and the electromagnetic brake 40 can refer to the related structure on the wheel or other equipment and devices of the electric wheelchair.

When moving the mobile conference screen, the hand is usually used to directly act on the side of the display screen 1 and the direction of force is parallel to the length direction of the display screen 1 due to the position and size of the display screen 1. Based on this, when the display 1 receives an external force parallel to the longitudinal direction thereof, the roller 3 automatically shifts from the braking state to the non-braking state by the electromagnetic brake 40.

As shown in fig. 3, in this embodiment, the movable conference screen further includes a control module 41 and a status indication module 42 for indicating the status of the roller 3, and the electromagnetic brake 40 and the status indication module 42 are electrically connected to the control module 41. Wherein, the status indication module 42 can be an LED indicator light bead, and its installation position can be set according to actual needs.

The control module 41 may determine whether the roller 3 is currently in a braked state according to the magnitude of the current obtained by the electromagnetic brake 40. Under the action of the control module 41, the LED indicator beads can display corresponding colors according to the current state of the roller 3.

The support 2 can be provided with a speed sensor 43, by means of which the speed of movement of the support 2 can be measured, wherein the speed sensor 43 is electrically connected to the control module 41. When the control module 41 knows that the roller 3 is currently in a non-braking state and the speed sensor 43 detects that the moving speed of the bracket 2 is zero, the control module 41 sends out a corresponding control signal to the electromagnetic brake 40, so that the electromagnetic brake 40 locks the roller 3.

In order to detect whether the side of the display screen 1 is subjected to an external force, a pressure sensor may be mounted on the side of the display screen 1, but the conventional pressure sensor is not suitable for this scheme because the size of the side of the display screen 1 is large and the force application positions are different due to the difference in height between different users. However, in order to increase the detection range, it is conceivable to install a pressure film sensor on the side of the display screen 1, but this method has a problem that the detection accuracy is not high, for example, a finger or some part of the body may touch the side of the display screen 1 unintentionally, and erroneous judgment may occur.

In order to detect whether the display screen 1 is subjected to an external force parallel to the longitudinal direction thereof, the following arrangement is made in the present embodiment:

the display screen 1 and the bracket 2 are in sliding connection, wherein the sliding direction of the display screen 1 relative to the bracket 2 is parallel to the length direction of the display screen 1. When the roller 3 is in a braking state and the display screen 1 and the bracket 2 slide relatively, the display screen 1 is judged to be acted by external force parallel to the length direction of the display screen 1.

In order to achieve a sliding connection between the display screen 1 and the bracket 2 and to ensure the reliability of the connection between the two, the structure of the display screen 1 and the bracket 2 will be described below.

As shown in fig. 4, the back of the display screen 1 is detachably provided with a first connection portion 11 and a second connection portion 12, and the first connection portion 11 and the second connection portion 12 can be fixed on the display screen 1 by bolts. The first connection part 11 and the second connection part 12 may be made of a material such as a steel plate, and the middle of the first connection part 11 and the second connection part 12 may be provided with a protrusion processed by a punching method or the like, wherein a groove is correspondingly formed at the inner side of the protrusion.

As shown in fig. 5, the bracket 2 includes a first cross bar 21, a second cross bar 22, a first longitudinal bar 23 and a second longitudinal bar 24, where the first cross bar 21 and the second cross bar 22 are parallel to each other, the first longitudinal bar 23 and the second longitudinal bar 24 are parallel to each other, have the same length and are symmetrically arranged, the top parts of the first longitudinal bar 23 and the second longitudinal bar 24 can be fixedly connected with the first cross bar 21 by welding or the like, and the two ends of the second cross bar 22 can be respectively fixedly connected with the middle parts of the first longitudinal bar 23 and the second longitudinal bar 24 by welding or the like.

As shown in fig. 5, the bracket 2 further includes two symmetrically disposed support leg assemblies 25, wherein the two support leg assemblies 25 may be fixed to the bottoms of the first longitudinal rod 23 and the second longitudinal rod 24, respectively, by welding or the like. The support leg group 25 includes a first support leg 251 and a second support leg 252, and the rollers 3 are mounted on the bottoms of both the first support leg 251 and the second support leg 252 and the bottoms of the rollers 3 are on the same plane. As shown in fig. 6, the top of the first supporting leg 251 is provided with a supporting surface 253 for supporting the bottom of the display screen 1.

Referring to fig. 4, 5 and 7, the assembly steps between the display 1 and the stand 2 are generally as follows:

disassembling the first connecting part 11 and the second connecting part 12 at the back of the lower display screen 1;

placing the display screen 1 on the support surface 253 of the first support leg 251;

the first connecting portion 11 and the second connecting portion 12 are installed, wherein the groove on the inner side of the projection on the first connecting portion 11 is covered on the first cross bar 21, and the groove on the inner side of the projection on the second connecting portion 12 is covered on the second cross bar 22.

In this embodiment, the bottom of the display screen 1 is slidably disposed on the supporting surface 253 of the first supporting leg 251, the first cross bar 21 is slidably connected to the first connecting portion 11, and the second cross bar 22 is slidably connected to the second connecting portion 12.

As shown in fig. 8, after the display screen 1 and the bracket 2 slide relatively, the movable conference screen may include an elastic reset member 26 to enable the two to be reset to the initial relative position. When the display screen 1 and the bracket 2 slide relatively to each other to generate a position change, the elastic restoring member 26 provides an elastic force for driving the display screen 1 and the bracket 2 to restore to the initial relative positions. When the display screen 1 is located at the initial position on the bracket 2, the elastic reset element 26 is in a natural state, i.e. is not deformed.

The initial position of the display screen 1 on the stand 2 can be preset and thus the size of the elastic restoring member 26 and the installation position of the elastic restoring member 26 can be determined.

The two ends of the elastic reset piece 26 are respectively connected with the first fixed block 261 and the second fixed block 262, wherein the first fixed block 261 can be fixedly connected with the bracket 2 in a bolt connection mode and the like, and the second fixed block 262 can be fixedly connected with the back of the display screen 1 in a bolt connection mode and the like.

When the display screen 1 slides on the support 2, the display screen 1 has the maximum slidable length relative to the support 2, so that the stability and reliability of connection between the display screen 1 and the support 2 can be effectively ensured. The maximum slidable length of the display screen 1 relative to the stand 2 may be set according to parameters such as the size and weight of the display screen 1 and the stand 2, for example, not more than 5 cm.

Referring to fig. 8, in the present embodiment, in order to define the maximum slidable length of the display screen 1 with respect to the stand 2, two elastic restoring members 26 may be installed on the display screen 1, wherein the two elastic restoring members 26 may be disposed separately on both sides of the first and second

longitudinal bars

23 and 24 of the stand 2.

In other embodiments, the number of resilient return members 26 and the location of installation may be set as desired. When the display screen 1 and the bracket 2 slide relatively, the sum of the elastic forces generated by the elastic reset pieces 26 is larger than the friction force between the display screen 1 and the bracket 2. Wherein the elastic restoring member 26 may be a spring.

In order to reduce the friction between the display screen 1 and the bracket 2 when they slide relatively, the parts or components where the display screen 1 and the bracket 2 are in contact may be subjected to polishing or the like, thereby reducing the friction coefficient and then having the effect of reducing the friction.

Further, a ball or a roller may be disposed at the contact portion between the two, so that sliding friction is converted into rolling friction, and friction generated when the bracket 2 slides relative to the display screen 1 is reduced. For example, as shown in fig. 6, a plurality of rollers 254 may be rotatably disposed on the first supporting leg 251, wherein the rollers 254 partially protrude above the supporting surface 253.

When the roller 3 is in a braking state and no external force acts, the bracket 2 and the ground are kept relatively static, and at this time, if a relative sliding trend occurs between the bracket 2 and the bottom surface, the friction between the roller 3 and the ground is sliding friction and static friction force exists. Further, an anti-slip structure may be disposed on the roller 3, and the friction coefficient between the contact surface of the roller 3 and the ground may be increased by using the anti-slip structure, so as to avoid slipping, where the anti-slip structure may include anti-slip lines or/and an anti-slip coating.

Based on the above, when the roller 3 is in a braking state and the display screen 1 is subject to an external force parallel to the length direction of the roller, the bracket 2 will remain stationary due to the inertia and static friction, and the display screen 1 will move due to the external force, so that the display screen 1 and the bracket 2 will slide relatively, and the roller 3 will be unlocked. The buffer force provided by the elastic restoring member 26 can be obtained at the moment when the stand 2 moves from rest, so that no collision occurs between the stand 2 and the display screen 1.

Although the display 1 and the bracket 2 are correspondingly processed to reduce the friction force therebetween, the friction force cannot be completely eliminated, and the elastic restoring member 26 does not cause relative sliding between the display 1 and the bracket 2 when slightly touching or touching the side of the display 1. Therefore, whether the display screen 1 is acted by external force parallel to the length direction of the display screen or not is judged by detecting whether the relative sliding occurs between the display screen 1 and the bracket 2, and the mode has higher accuracy.

In this embodiment, the movable conference screen includes a slide detection module 44, and the slide detection module 44 is configured to detect whether or not a relative slide occurs between the display screen 1 and the stand 2.

As shown in fig. 8, the slip detection module 44 may include a hall sensor 441 and a magnet 442. The hall sensor 441 is fixedly disposed on the display screen 1 and electrically connected to the control module 41, and the magnet 442 is fixedly disposed on the bracket 2, wherein the hall sensor 441 is used for detecting a position change of the magnet 442. When the hall sensor 441 detects that the position of the magnet 442 changes, it can be determined that the relative sliding is generated between the display screen 1 and the bracket 2.

The mounting positions of the hall sensor 441 and the magnet 442 may be set as needed, but the following points need to be ensured:

1. when the display screen 1 and the bracket 2 slide relatively, no matter what relative position is between the two, the bracket 2 cannot contact or collide with the Hall sensor 441 arranged on the display screen 1;

2. the distance between the hall sensor 441 and the magnet 442 needs to be controlled within a certain range, so as to ensure that the hall sensor 441 can always sense the magnetic field generated by the magnet 442.

When the roller 3 is in a braking state and the display screen 1 is subjected to an external force parallel to the length direction of the roller, the display screen 1 and the bracket 2 slide relatively, meanwhile, the Hall sensor 441 detects the position change of the magnet 442 and transmits an unlocking signal to the control module 41, and the control module 41 receives the unlocking signal and then controls the electromagnetic brake 40 to unlock the roller 3.

In this embodiment, the support 2 may be provided with a reminder module 45. When the moving speed of the support 2 is greater than the set value, the reminding module 45 sends out a speed reminding signal, so that a carrier is reminded to control the moving speed of the support 2 to avoid that the moving speed is too fast to control. The reminding module 45 is electrically connected to the control module 41, wherein the reminding module 45 can use a sound player.

Both sides along the length direction of the display screen 1 may be provided with a barrier detection module 46, where the barrier detection module 46 is used to detect the distance between the side of the display screen 1 and the barrier. The obstacle detection module 46 may be an ultrasonic ranging sensor, a laser ranging sensor or an infrared ranging sensor.

In the present embodiment, the obstacle detecting module 46 is electrically connected to the control module 41. In the moving process of the support 2, that is, when the moving speed of the support 2 is not zero, when the obstacle detection module 46 detects that an obstacle exists on the side surface of the display screen 1, and the distance between the side surface of the display screen 1 and the obstacle is smaller than the preset distance, the reminding module 45 sends an obstacle reminding signal to remind a carrier to slow down.

In the present embodiment, a power supply module for supplying power to the electromagnetic brake 40, the control module 41, the status indication module 42, the hall sensor 441, the speed sensor 43, the obstacle detection module 46, and the like described above may be installed at the back of the display screen 1.

The power supply module can adopt rechargeable batteries such as lithium batteries. When the display screen 1 is connected with the mains supply, the power supply on the display screen 1 can directly charge the power supply module, so that the cruising ability of the power supply module is ensured.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. The movable conference screen is characterized by comprising a display screen and a bracket, wherein a roller is arranged at the bottom of the bracket, and an electromagnetic brake for braking the roller is arranged on the roller;

when the roller is in a braking state and the display screen is subjected to the action of external force parallel to the length direction of the display screen, the electromagnetic brake unlocks the roller to release the braking state of the roller;

the movable conference screen comprises a sliding detection module, and the sliding detection module is used for detecting whether relative sliding occurs between the display screen and the bracket.

2. The mobile conference screen of claim 1, wherein the display screen is slidably disposed on the stand, wherein a slidable direction of the display screen with respect to the stand is parallel to a length direction of the display screen;

3. The mobile conference screen of claim 1, wherein the slide detection module comprises a hall sensor and a magnet;

4. The mobile conference screen of claim 2, wherein the mobile conference screen comprises a resilient reset member;

5. The mobile conference screen of claim 4, wherein the resilient return member comprises a spring.

6. The mobile conference screen according to any one of claims 1-5, wherein a reminder module is provided on the stand, the reminder module sending a speed reminder when the speed of movement of the stand is greater than a set value.

7. The mobile conference screen of claim 6, wherein the reminder module is a sound player.

8. The mobile conference screen according to any one of claims 1-5, wherein an obstacle detection module is provided on both sides in a length direction of the display screen, and the obstacle detection module is configured to detect a distance from a side surface of the display screen to an obstacle.

9. The mobile conference screen of claim 8, wherein the obstacle detection module is an ultrasonic ranging sensor, a laser ranging sensor, or an infrared ranging sensor.