A demonstration table mobile tablet support device and a movement control method

Abstract

The application relates to the field of tablet supports, in particular to a demonstration table mobile tablet support device and a mobile control method, which comprises a support body for placing a tablet or a book, a guiding and moving module for directional movement of the support body, a friction rod fixed in position, a friction block and an electric linear actuator which synchronously move with the support body, a state detection module for detecting the moving or stopping state of the support body, and a control module for controlling the electric linear actuator based on the support body state detected by the state detection module, so that the moving convenience of the tablet support and the position stability after the tablet support is moved into position are considered.

Description

Technical Field

[0001] This application relates to the field of tablet stands, and more particularly to a device for moving a demonstration table tablet stand and a method for controlling its movement. Background Technology

[0002] In school teaching, tablets are generally placed on conventional stands. However, when teachers are lecturing, it is most suitable to place the tablet stand in the center of the classroom demonstration table. But when conducting teaching experiments, the tablet stand should be placed to the side of the demonstration table to minimize the impact on the experimental operation.

[0003] Therefore, some tablet stands employ a sliding adjustment mechanism. For example, CN211582089U is a sliding desk that works with a tablet, allowing for left and right lateral movement relative to the tablet user to adjust its position. See also... Figure 6 In the actual flat plate bracket product, the slide block 9 moves on the track 10, allowing the flat plate bracket connected to the slide block connector 8 and the track block 9 to freely adjust its position.

[0004] During the movement of a tablet stand, it is necessary for the stand to move smoothly without requiring much effort. However, once the stand is in place, the external force applied to the stand when operating the tablet can easily cause it to move arbitrarily, making it easy to change the position of the stand after adjustment, resulting in a poor user experience. Summary of the Invention

[0005] To ensure both ease of movement of the tablet stand and stability after it is in place, this application provides a device for moving a demonstration table tablet stand and a method for controlling its movement.

[0006] Firstly, the demonstration platform mobile tablet support device provided in this application adopts the following technical solution.

[0007] A mobile tablet support device for a demonstration stand includes a support body for placing a tablet or book, a guide movement module for directional movement of the support body, a fixed friction rod, a friction block and an electric linear actuator that move synchronously with the support body, a state detection module for detecting the movement or stop state of the support body, and a control module for controlling the electric linear actuator based on the state of the support body detected by the state detection module.

[0008] By adopting the above technical solution, the main body of the support can automatically switch working modes according to the moving or stopped state. When moving, the friction force of the friction block on the friction rod can be reduced to ensure smooth movement of the main body of the support. After stopping or reaching the position, the friction block can be driven by the electric linear actuator to press the friction rod, so that the main body of the support can obtain a larger static holding force and prevent the main body of the support from being easily pushed when the teacher operates the tablet or book.

[0009] Optionally, a pressure detection module is also included, which is used to detect the pressure value of the friction block pressing against the friction rod.

[0010] By adopting the above technical solution, the pressure value when the friction block presses against the friction rod can be detected in real time, so that the control module can adjust the extension of the electric linear actuator according to the actual pressure. This avoids the bracket body being unstable due to insufficient clamping force, and also avoids excessive clamping force causing excessive wear of the friction block or difficulty in moving the bracket body again.

[0011] Optionally, the state detection module includes a speed detection unit, which detects the speed of the support body based on the Hall effect theorem.

[0012] By adopting the above technical solution, the moving speed of the support body can be obtained more accurately, providing a data basis for judging whether the support body is in a moving state, whether it is moving at excessive speed, and whether it is necessary to activate damping deceleration, thereby improving the stability and responsiveness of the movement control.

[0013] Optionally, the status detection module further includes a position detection unit, which detects the position of the support body relative to the demonstration table.

[0014] By adopting the above technical solution, the position of the support body relative to the demonstration platform can be detected, and it can be determined whether the support body has moved to the central teaching position, the side experimental position, or the position near the end of the guide rail. This enables the control module to perform fixed, pre-deceleration, or buffer protection control at the specified position, thereby improving the accuracy of the support body position switching and the user experience.

[0015] Optionally, the guide movement module includes a guide rail and a slider that is slidably connected to the guide rail and moves synchronously with the support body. Both ends of the guide rail are provided with end buffer mechanisms, which absorb the impact force applied to the support body through elastic buffers.

[0016] By adopting the above technical solution, the support can be made to move stably in the predetermined direction. It can also absorb the impact force when the support hits the end of the guide rail, reduce the inertial impact caused by the support stopping suddenly or colliding, and reduce the risk of the tablet or book slipping or tipping off the support.

[0017] Secondly, the motion control method provided in this application adopts the following technical solution.

[0018] A motion control method, based on the operation of the aforementioned mobile tablet support device for a demonstration platform, specifically includes the following steps.

[0019] S1. Detect the speed and position of the main body of the support;

[0020] S2. When the speed of the support body is detected to be greater than zero, the electric linear actuator drives the friction block away from the friction rod;

[0021] S3. When the speed of the support body is detected to be zero or when it moves to a specified position, the electric linear actuator drives the friction block to fit against the friction rod.

[0022] By adopting the above technical solution, a control process of releasing during movement and fixing when stopped is realized, which makes the support less resistant and easier to move during movement; after stopping or moving to a designated position, it can automatically form friction fixation to prevent the position of the support body from being easily changed.

[0023] Optionally, in step S2, when the speed of the support body is greater than or equal to the first speed threshold, the pressure value between the friction block and the friction rod is controlled to the first target pressure.

[0024] When the speed of the support body is greater than or equal to the second speed threshold, the pressure value between the friction block and the friction rod increases linearly from the first target pressure to the second target pressure.

[0025] By adopting the above technical solution, the pressure between the friction block and the friction rod can be controlled according to different speed ranges. Slight damping can be applied when the speed of the support body is too fast, and the damping force can be gradually increased when the speed is too fast, so as to achieve smooth deceleration and avoid the problem of sudden locking causing the support body to stop abruptly and the plate to shake or fall.

[0026] Optionally, when the support body detects that the friction block and friction rod are close to the end of the guide rail and the speed is greater than or equal to the first speed threshold, the pressure value between the friction block and the friction rod is controlled to the second target pressure.

[0027] By adopting the above technical solution, when the support body is detected to be close to the end of the guide rail and at a high speed, the pressure between the friction block and the friction rod is directly controlled to the second target pressure. This allows for strong pre-deceleration before the support body reaches the end of the guide rail, reducing the end impact speed. This effect, combined with the end buffer mechanism, can further reduce the impact force and improve the safety of the flat plate placement.

[0028] Optionally, after the support body is stationary or moved to a designated position, the electric linear actuator power rod extends to the pressure value between the friction block and the friction rod, which is a preset static pressure.

[0029] When the power rod of the electric linear actuator extends to its maximum stroke, if the pressure between the friction block and the friction rod is less than or equal to the preset static pressure, it indicates that the friction block should be replaced.

[0030] By adopting the above technical solution, after the support body is stationary or moved to a designated position, the electric linear actuator is controlled to extend to the friction block and friction rod to reach the preset static pressure, which can ensure that the fixing force of the support body is stable and reliable after it stops. At the same time, when the actuator reaches its maximum stroke but still cannot reach the preset static pressure, it prompts to replace the friction block, which can detect excessive wear of the friction block in time and avoid the support being unable to be reliably fixed due to the failure of the friction block.

[0031] Optionally, in S3, after detecting that the speed of the support body is equal to zero and continues for a predetermined time, the electric linear actuator drives the friction block to adhere to the friction rod.

[0032] By adopting the above technical solution, the bracket can be prevented from being locked prematurely during short pauses, low-speed adjustments, or user fine-tuning of the position, thereby improving the accuracy of control judgment and enabling the bracket to be easily fine-tuned and automatically fixed after it truly stops.

[0033] In summary, this application includes at least the following beneficial effects:

[0034] Based on the original left-right movement of the demonstration table's flat plate support, which can hold flat plates or books, a fixed friction rod, a friction block that moves synchronously with the support body, and an electric linear actuator are added. This allows the support body to keep the friction block away from or in low-pressure contact with the friction rod during movement, thus maintaining a low-resistance, smooth, and effortless translation feel.

[0035] After the main body of the support stops or moves to the designated position, the friction block can be pushed to press the friction rod by the electric linear actuator, generating a large static friction holding force to prevent the position of the support from easily changing when the teacher touches the tablet, flips through the book or accidentally touches the support.

[0036] Meanwhile, through the cooperation of the speed detection unit, position detection unit and pressure detection module, friction damping can be gradually increased when the moving speed of the support body exceeds the threshold or approaches the end of the guide rail, so as to achieve smooth deceleration and prevent the plate from falling due to rapid sliding or end impact.

[0037] The end buffer mechanism further absorbs the impact at extreme positions, improving safety; and by detecting the correspondence between the stroke of the electric linear actuator and the friction pressure, the wear condition of the friction block can be determined and replacement can be indicated. Attached Figure Description

[0038] Figure 1 This is a structural diagram of a mobile flat panel support device for a demonstration platform.

[0039] Figure 2 This is an internal structural diagram of a mobile flat panel support device for a demonstration table after the tabletop cover has been removed.

[0040] Figure 3 yes Figure 2 A larger image is shown in section A;

[0041] Figure 4 This is a control logic diagram of a motion control method during the movement of the support body.

[0042] Figure 5 This is a control logic diagram of a motion control method when stationary.

[0043] Figure 6 This is a schematic diagram of the structure of an existing mobile flat panel support for demonstration platforms in the background art.

[0044] Explanation of reference numerals in the attached drawings: 1. Support body; 2. Guide movement module; 3. Friction rod; 4. Friction block; 41. Speed ​​measuring magnet; 42. Positioning magnet; 43. Hall switch; 44. End warning magnet; 5. Electric linear actuator; 51. Status detection module; 52. Control module; 53. Pressure detection module; 54. Speed ​​detection unit; 55. Position detection unit; 56. Guide rail; 57. Slider; 58. End buffer mechanism; 59. Hall element; 8. Slider connector; 9. Track slider; 10. Track. Detailed Implementation

[0045] The present application will be further described in detail below with reference to the accompanying drawings.

[0046] This application discloses a mobile tablet stand device for a demonstration platform, as shown in the embodiments below. Figure 1 The device includes a support body 1 for placing a tablet or book. The support body 1 is attached to the surface of the tablet and can be provided with silicone anti-slip strips. The bottom of the support body 1 is bent into a U-shape to allow the bottom of the tablet to be placed in. A rubber pad is provided in the U-shaped groove at the bottom of the support body 1 to protect the bottom of the tablet.

[0047] Reference Figure 2 and Figure 3 The demonstration stand is equipped with a guide moving module 2, which includes a guide rail 56 fixedly installed along the length of the demonstration stand. A slider 57 is slidably connected to the guide rail 56, and the support body 1 is detachably connected to the slider 57. Both ends of the guide rail 56 are provided with end buffer mechanisms 58, which can be elastic buffers (such as silicone blocks, rubber blocks, spring buffers, hydraulic buffers, or pneumatic buffers) to absorb the impact force when the slider 57 rushes to the end of the guide rail 56 at a relatively high speed.

[0048] Reference Figure 3A friction rod 3 is fixedly installed on the demonstration platform close to the guide rail 56, with the length direction of the friction rod 3 aligned with that of the guide rail 56. An electric linear actuator 5 is detachably connected to the main body 1. The electric linear actuator 5 can be a miniature electric push rod, a stepper motor lead screw assembly, a servo motor lead screw assembly, or a linear driver with stroke feedback. A friction block 4 is detachably connected to the power rod of the electric linear actuator 5. The friction block 4 can fit tightly against the friction rod 3 so that the main body 1 can withstand greater frictional force and not easily move when it does not need to move. The friction rod 3 can be made of stainless steel round rod, aluminum alloy wear-resistant rod, or a metal rod with a roughened surface texture. The surface of the friction rod 3 can be sandblasted, knurled, or anodized to improve the frictional stability after the friction block 4 is pressed. The friction block 4 can be made of polyurethane, nitrile rubber, silicone rubber, wear-resistant resin, or composite brake pad material. An arc-shaped concave surface adapted to the outer circumference of the friction rod 3 can be provided on the side of the friction block 4 that contacts the friction rod 3 to increase the contact area and improve the pressing stability.

[0049] Reference Figure 2 and Figure 3 A status detection module 51 is provided between the support body 1 and the guide rail 56. The status detection module 51 includes a speed detection unit 54 and a position detection unit 55. The speed detection unit 54 may include a Hall element 59 and a row of velocity-measuring magnets 41. The row of velocity-measuring magnets 41 is evenly arranged along the length of the guide rail 56, and the spacing between two adjacent velocity-measuring magnets 41 can be 5-20mm. The Hall element 59 is detachably connected to the support body 1 and is electrically connected to a control module 52. The control module 52 can be a microcontroller control board, an embedded control board, or part of the central control board of the demonstration platform. When the support body 1 moves along the guide rail 56, the Hall element 59 passes through multiple velocity-measuring magnets 41 in sequence and outputs pulse signals. The control module 52 calculates the moving speed of the support body 1 based on the frequency of the pulse signals per unit time.

[0050] Reference Figure 2 and Figure 3 The position detection unit 55 includes positioning magnets 42 disposed at both ends of the guide rail 56 along its length and a Hall switch 43 disposed on the slider 57. When the support body 1 moves to the corresponding position, the Hall switch 43 detects the positioning magnets 42, and the control module 52 can determine that the support body 1 has moved to the designated position. In addition, end warning magnets 44 can be disposed near both ends of the guide rail 56. The distance between the end warning magnets 44 and the ends of the guide rail 56 can be 30-80mm, so as to perform deceleration control in advance when the support body 1 approaches the ends of the guide rail 56.

[0051] Reference Figure 3A pressure detection module 53 is provided between the friction block 4 and the electric linear actuator 5. The pressure detection module 53 can be located between the power rod of the electric linear actuator 5 and the friction block 4. The pressure detection module 53 can be a thin-film pressure sensor, a miniature load cell, a strain gauge sensor, or a pressure-sensitive resistor. The pressure detection module 53 sends the detected pressure value to the control module 52, and the control module 52 adjusts the extension length of the electric linear actuator 5 according to the pressure value.

[0052] This application also discloses a motion control method, which specifically includes the following steps.

[0053] S1. Detect the speed and position of the main body 1 of the support frame.

[0054] The speed detection unit 54 detects the pulse frequency signal output by the magnet through the Hall element 59, and the control module 52 calculates the moving speed of the support body 1 based on the number of pulses per unit time. The position detection unit 55 detects whether the support body 1 is in the central teaching position, the left experimental avoidance position, the right experimental avoidance position, or a position close to the end of the guide rail 56.

[0055] S2. When the speed of the support body 1 is detected to be greater than zero, the electric linear actuator 5 drives the friction block 4 away from the friction rod 3.

[0056] Reference Figure 4 When the speed of the support body 1 is detected to be greater than zero and less than the first speed threshold (V1), the control module 52 determines that the support body 1 is in a normal moving state. At this time, the control module 52 controls the electric linear actuator 5 to drive the friction block 4 away from the friction rod 3, so that the friction block 4 and the friction rod 3 maintain a preset gap (such as 0.5-2mm).

[0057] When the detected speed of the support body 1 is greater than or equal to a first speed threshold (e.g., 0.08-0.18 m / s), the control module 52 controls the electric linear actuator 5 to slowly extend, causing the friction block 4 to abut against the friction rod 3. Based on the pressure value detected by the pressure detection module 53, the pressure between the friction block 4 and the friction rod 3 is controlled to a first target pressure (e.g., 5-20 N). At this time, slight frictional damping is generated between the friction block 4 and the friction rod 3 to suppress further acceleration of the support body 1.

[0058] When the detected speed of the support body 1 is greater than or equal to the second speed threshold (V2), the control module 52 controls the electric linear actuator 5 to continue extending, so that the pressure value between the friction block 4 and the friction rod 3 increases linearly from the first target pressure to the second target pressure (e.g., 25-60N). The time for the pressure to increase linearly can be 0.2-0.8s. During this process, the control module 52 continuously collects the pressure value of the pressure detection module 53, and fine-tunes the extension length of the electric linear actuator 5 to make the actual pressure close to the target pressure, and to smoothly decelerate the support body 1 when moving at high speed.

[0059] When the position detection unit 55 detects that the support body 1 is approaching the end of the guide rail 56, and the speed detection unit 54 detects that the speed of the support body 1 is greater than or equal to the first speed threshold, the control module 52 controls the pressure between the friction block 4 and the friction rod 3 to the second target pressure. Thus, the support body 1 decelerates before reaching the end of the guide rail 56. If the support body 1 continues to move and contacts the end of the guide rail 56, the impact force is absorbed by the end buffer mechanism 58.

[0060] S3. When the speed of the support body 1 is detected to be zero or when it moves to a specified position, the electric linear actuator 5 drives the friction block 4 to fit against the friction rod 3.

[0061] Reference Figure 4 When the speed of the support body 1 is equal to zero and remains so for a predetermined time, the control module 52 determines that the support body 1 has stopped. The predetermined time can be 1-2 seconds, so as to avoid the support body 1 being prematurely fixed during short pauses or user fine-tuning.

[0062] Reference Figure 5 When the control module 52 determines that the support body 1 has stopped, or the position detection unit 55 detects that the support body 1 has moved to the specified position at the extreme points of both ends of the guide rail 56, the control module 52 controls the extension of the power rod of the electric linear actuator 5, so that the friction block 4 contacts and presses against the friction rod 3. The control module 52 adjusts the extension length of the electric linear actuator 5 according to the pressure value fed back by the pressure detection module 53 until the pressure value between the friction block 4 and the friction rod 3 reaches the preset static pressure P. hold The preset static pressure can be 35-85N. After the preset static pressure is reached, the control module 52 stops the electric linear actuator 5 from extending and maintains its current position, so that the support body 1 is in a stable and fixed state.

[0063] When the support body 1 is in a fixed state and the speed detection unit 54 detects that the support body 1 is moving, the control module 52 controls the electric linear actuator 5 to retract, so that the friction block 4 moves away from the friction rod 3.

[0064] In addition, the control module 52 records the extension length of the power rod of the electric linear actuator 5. If the pressure value between the friction block 4 and the friction rod 3 is still less than or equal to the preset static pressure when the power rod of the electric linear actuator 5 extends to its maximum stroke, the control module 52 determines that the friction block 4 is worn too much, that is, the friction block 4 needs to be replaced, and the control module 52 outputs a prompt signal.

[0065] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A mobile flat panel support device for a demonstration platform, characterized in that: It includes a support body (1) for placing a tablet or book, a guide movement module (2) for directional movement of the support body (1), a fixed friction rod (3), a friction block (4) that moves synchronously with the support body (1), an electric linear actuator (5), a status detection module (51) for detecting the movement or stop state of the support body (1), and a control module (52) for controlling the electric linear actuator (5) based on the status of the support body (1) detected by the status detection module (51).

2. The mobile flat panel support device for a demonstration platform according to claim 1, characterized in that: It also includes a pressure detection module (53), which is used to detect the pressure value of the friction block (4) pressing against the friction rod (3).

3. The mobile tablet support device for a demonstration platform according to claim 1, characterized in that: The state detection module (51) includes a speed detection unit (54), which detects the speed of the support body (1) based on the Hall effect theorem.

4. The mobile flat panel support device for a demonstration platform according to claim 1, characterized in that: The status detection module (51) also includes a position detection unit (55), which detects the position of the support body (1) relative to the demonstration table.

5. The mobile tablet support device for a demonstration platform according to claim 1, characterized in that: The guide moving module (2) includes a guide rail (56) and a slider (57) that is slidably connected to the guide rail (56) and moves synchronously with the support body (1). Both ends of the guide rail (56) are provided with end buffer mechanisms (58). The end buffer mechanisms (58) absorb the impact force applied to the support body (1) through elastic buffers.

6. A motion control method, based on the operation of a demonstration platform mobile tablet support device according to any one of claims 1-5, characterized in that: Specifically, the steps include the following: S1. Detect the speed and position of the main body (1) of the support; S2. When the speed of the support body (1) is detected to be greater than zero, the electric linear actuator (5) drives the friction block (4) away from the friction rod (3). S3. When the speed of the support body (1) is detected to be zero or when it moves to the specified position, the electric linear actuator (5) drives the friction block (4) to fit against the friction rod (3).

7. A motion control method according to claim 6, characterized in that: In S2, when the speed of the support body (1) is greater than or equal to the first speed threshold, the pressure value between the friction block (4) and the friction rod (3) is controlled to be the first target pressure. When the speed of the support body (1) is greater than or equal to the second speed threshold, the pressure value between the friction block (4) and the friction rod (3) increases linearly from the first target pressure to the second target pressure.

8. A motion control method according to claim 7, characterized in that: When the support body (1) detects that it is close to the end of the guide rail (56) and the speed is greater than or equal to the first speed threshold, the pressure value between the friction block (4) and the friction rod (3) is controlled to be the second target pressure.

9. A motion control method according to claim 6, characterized in that: After the support body (1) is stationary or moved to a designated position, the power rod of the electric linear actuator (5) extends to the pressure value between the friction block (4) and the friction rod (3) as a preset static pressure; When the power rod of the electric linear actuator (5) extends to its maximum stroke, if the pressure value between the friction block (4) and the friction rod (3) is less than or equal to the preset static pressure, it will prompt to replace the friction block (4).

10. A motion control method according to claim 6, characterized in that: In S3, when the speed of the support body (1) is detected to be zero and continues for a predetermined time, the electric linear actuator (5) drives the friction block (4) to adhere to the friction rod (3).

Images