A resistance detection and stop control device for a projection screen

Abstract

The utility model relates to projection screen technical field provides a kind of for the obstruction detection and stopping control device of projection screen, in the utility model, by the detection module of integrated posture sensor and wireless signal transmitter being set in curtain guide rail, and by power supply independent power supply, can real-time perception the posture change in the lifting process of guide rail, when detecting abnormal inclination exceeds preset threshold, obstruction signal is generated in time and is sent to drive control unit by wireless mode, realize the automatic stop or reversal of motor, effectively avoid curtain tear, guide rail deformation and motor overload, improve the security and reliability of projection screen operation, solve the problem that the existing electric projection screen lacks obstruction automatic stop function and leads to equipment damage and security risk.

Description

Technical Field

[0001] This utility model relates to the field of projection screen technology, and in particular to an obstacle detection and stop control device for projection screens. Background Technology

[0002] Projection screens, as key display media in modern conference systems, educational equipment, and home theaters, are widely used in various indoor environments. With the increasing prevalence of electric lifting technology, users are demanding higher levels of automation, intelligence, and safety from projection screens. During the lifting process, the screen may accidentally encounter obstacles due to confined spaces, foot traffic, or furniture placement. If the system fails to respond promptly, it can easily lead to screen tearing, guide rail deformation, motor overload, and even personal safety hazards. Therefore, intelligent projection screens with automatic obstacle detection and stopping functions have become an important development direction for improving safety and user experience.

[0003] However, most motorized projection screens on the market currently lack effective obstacle detection and stop protection mechanisms. Their control systems typically rely solely on preset travel distances or timers for start-stop operation, lacking the ability to sense changes in the external environment. When the screen encounters a person, table, chair, or other obstacle during descent, the motor continues to output power, causing the screen to stretch or the guide rail to twist, which can easily lead to equipment damage over time. Furthermore, in unattended automated operation scenarios, such problems are even more difficult to detect in a timely manner, posing a significant safety risk.

[0004] The purpose of this invention is to solve the problem that existing electric projection screens lack an automatic stop function when encountering obstacles, which can easily lead to equipment damage and safety risks. Utility Model Content

[0005] The purpose of this invention is to solve the problem that existing electric projection screens lack an automatic stop function upon encountering obstacles, which easily leads to equipment damage and safety risks. This invention adopts the following technical solution: An obstacle detection and stop control device for a projection screen includes a screen guide rail and a projection screen drive control unit. A detection component is installed in the screen guide rail. The detection component includes a power supply and a detection module. The detection module integrates an attitude sensor and a wireless signal transmitter. The power supply powers the attitude sensor and the wireless signal transmitter. The attitude sensor detects attitude changes of the screen guide rail during lifting and lowering and generates an obstacle detection signal when the detected attitude change exceeds a preset threshold. The wireless signal transmitter wirelessly transmits the obstacle detection signal to the projection screen drive control unit.

[0006] As described above, an obstacle detection and stop control device for a projection screen includes a detection component installed at the end region of the left or right end of the screen guide rail. The detection module further includes a microcontroller electrically connected to the attitude sensor and a wireless signal transmitter. The microcontroller is powered by the power supply and is used to process the data collected by the attitude sensor and generate an obstacle detection signal when a continuous abnormal attitude change is detected.

[0007] As described above, in a projection screen obstacle detection and stop control device, the attitude sensor is a level sensor, which is used to monitor the tilt angle of the screen guide rail in real time during the lifting and lowering process. The sensing axis of the level sensor is perpendicular to the length direction of the screen guide rail.

[0008] As described above, in a device for obstruction detection and stop control of a projection screen, the wireless signal transmitter is an RF signal transmitter. The RF signal transmitter is used to send an obstruction signal to the drive control unit of the projection screen via radio frequency. The drive control unit is equipped with a wireless signal receiver that matches the RF signal transmitter.

[0009] As described above, an obstacle detection and stop control device for a projection screen includes a housing, in which the power supply and the detection module are both housed; a partition is provided inside the housing, through which the power supply and the detection module are separated.

[0010] As described above, an obstacle detection and stop control device for a projection screen includes a sealing cover at the open end of the housing, a sealing ring between the sealing cover and the housing, an installation groove on the screen guide rail, and the housing being disposed within the installation groove. The housing and the installation groove are either interference-fitted or fixed by screws.

[0011] As described above, in a projection screen obstacle detection and stop control device, the screen guide rail is installed at the bottom of the projection screen, the top of the screen guide rail is provided with a through groove extending along its length, and the bottom edge of the projection screen is accommodated in the through groove.

[0012] As described above, an obstacle detection and stop control device for a projection screen has a bottom cover on the bottom of the screen guide rail, plugs at both ends of the screen guide rail, and a plug on one side of each plug, the plug being inserted into the end of the mounting groove.

[0013] As described above, an obstacle detection and stop control device for a projection screen has a detection module installed at the end region of the screen guide rail.

[0014] Implementing the embodiments of this utility model has the following beneficial effects: 1. In this utility model, by setting an integrated attitude sensor and wireless signal transmitter detection module in the screen guide rail, and powered independently by a power supply, the system can sense the attitude changes of the guide rail in real time during the lifting process. When an abnormal tilt is detected that exceeds a preset threshold, an obstruction signal is generated in a timely manner and sent to the drive control unit wirelessly, so as to realize the automatic stop or reverse of the motor. This effectively avoids screen tearing, guide rail deformation and motor overload, improves the safety and reliability of the projection screen operation, and solves the problem of equipment damage and safety risks caused by the lack of automatic stop function when encountering obstruction in existing electric projection screens. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of an obstacle detection and stop control device for a projection screen according to the present invention.

[0017] Figure 2 This utility model relates to an obstacle detection and stop control device for projection screens.

[0018] Figure 3 yes Figure 2 A magnified structural diagram of point A in the middle.

[0019] Figure 4 This is a schematic diagram of the detection component of an obstacle detection and stop control device for a projection screen according to the present invention.

[0020] As shown in the figure: 1. Curtain rail; 11. Mounting slot; 12. Through slot; 2. Bottom shell; 3. Detection assembly; 31. Box body; 32. Power supply; 33. Detection module; 4. End cap; 41. Insert block. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figures 1 to 4As shown, this utility model proposes an obstacle detection and stop control device for a projection screen, including a screen guide rail 1 and a projection screen drive control unit. The screen guide rail 1 has a mounting groove 11, and a detection component 3 is installed in the mounting groove 11. The detection component 3 includes a power supply 32 and a detection module 33. The detection module 33 integrates an attitude sensor and a wireless signal transmitter. The power supply 32 supplies power to the attitude sensor and the wireless signal transmitter. The attitude sensor detects the attitude change of the screen guide rail during the lifting and lowering process and generates an obstacle detection signal when the detected attitude change exceeds a preset threshold. The wireless signal transmitter wirelessly transmits the obstacle detection signal to the projection screen drive control unit. The detection module 33 is installed in the end area of ​​the screen guide rail. During operation, the detection component 3 installed in the end area of ​​the screen guide rail 1 monitors the attitude of the guide rail in real time. During the projection screen's raising and lowering process, if the bottom of the screen or one side of the guide rail encounters an obstacle, causing the guide rail to tilt, the attitude sensor integrated in the detection module 33 will detect the change in the attitude of the screen guide rail 1. When this change exceeds a preset threshold, the detection module 33 generates an obstruction signal and transmits it through its integrated wireless signal transmitter. This signal is received by the projection screen drive control unit, which then controls the motor to stop or reverse, achieving obstruction protection and effectively preventing screen tearing, guide rail deformation, or motor overload, thus improving the safety and reliability of the projection screen. Throughout the process, the power supply 32 provides operating power to the attitude sensor and wireless signal transmitter in the detection module 33, and the mounting slot 11 is used to accommodate and fix the detection component 3, ensuring its stable operation.

[0023] Furthermore, as a preferred embodiment of this utility model and not a limitation, the detection component 3 is installed at the left or right end region of the screen guide rail 1. The detection module 33 also includes a microcontroller, which is electrically connected to the attitude sensor and the wireless signal transmitter. The microcontroller is powered by the power supply 32. The microcontroller processes the data collected by the attitude sensor and generates an obstruction signal when it determines that there is a continuous abnormal attitude change. When the screen encounters an obstacle during operation, one end of the guide rail undergoes an attitude change. The attitude sensor collects this change data and transmits it to the microcontroller in the detection module 33. By setting the detection component 3 at the left or right end region of the screen guide rail 1, it is possible to accurately capture attitude changes caused by obstruction on one side of the guide rail, thereby improving detection sensitivity and accuracy. The microcontroller is powered by the power supply 32 and processes the received data to determine whether there is a continuous abnormal attitude change. When the preset conditions are met, the microcontroller generates an obstruction signal and sends the signal to the projection screen drive control unit through the wireless signal transmitter electrically connected to it, triggering the motor to stop or reverse, thus achieving automatic protection.

[0024] Optionally, in some embodiments, the attitude sensor is a level sensor, which is used to monitor the tilt angle of the curtain guide rail 1 in real time during the lifting and lowering process. The sensing axis of the level sensor is perpendicular to the length direction of the curtain guide rail 1. This level sensor is used to monitor the change in tilt angle of the curtain guide rail 1 in real time during the lifting and lowering process. When the curtain guide rail 1 tilts to one side due to an obstacle at its bottom, the level sensor detects its own attitude deviation relative to the direction of gravity. Because the sensing axis of the level sensor is perpendicular to the length direction of the curtain guide rail 1, it can sensitively respond to the flipping or tilting of the guide rail in the vertical plane, thereby accurately capturing the attitude abnormalities at the end of the guide rail and providing reliable data for the subsequent generation of an obstruction signal.

[0025] Optionally, in some embodiments, the wireless signal transmitter is an RF signal transmitter. The RF signal transmitter is used to send an obstruction signal to the drive control unit of the projection screen via radio frequency. The drive control unit is equipped with a wireless signal receiver matched with the RF signal transmitter. Upon receiving the obstruction signal, the RF signal transmitter wirelessly transmits the signal to the drive control unit of the projection screen via radio frequency. The drive control unit is equipped with a wireless signal receiver matched with the RF signal transmitter to receive and parse the radio frequency signal. After confirming the signal is valid, the drive control unit immediately controls the drive motor to stop running or perform a reverse action, thereby achieving timely protection of the projection screen.

[0026] Furthermore, as a preferred embodiment of this utility model and not a limitation, the detection component 3 includes a housing 31, and the power supply 32 and the detection module 33 are both housed inside the housing 31. A partition is provided inside the housing 31, separating the power supply 32 and the detection module 33 to prevent electrical interference or short circuits between them. A sealing cap is provided at the open end of the housing 31, and a sealing ring is provided between the sealing cap and the housing to seal the internal space, enhancing the waterproof and dustproof capabilities of the housing 31 and adapting to complex operating environments. The housing 31 is interference-fitted with the mounting groove 11 or fixed with screws to ensure stable installation of the detection component 3 during lifting and lowering, unaffected by vibration or external forces, and ensuring continuous and reliable operation of the internal components.

[0027] Furthermore, as a preferred embodiment of this utility model and not a limitation, the screen guide rail 1 is installed at the bottom of the projection screen to provide counterweight to keep the screen flat. The top of the screen guide rail 1 is provided with a through groove 12 extending along its length. The bottom edge of the projection screen is accommodated in the through groove 12 to realize the connection and guidance between the screen and the guide rail. The bottom of the screen guide rail 1 is covered by a bottom shell 2 to seal the internal space. Both ends of the screen guide rail 1 are provided with plugs 4. One side of the plug 4 is provided with an insert 41. The insert 41 is inserted into the end of the mounting groove 11 to realize the sealing of the end of the mounting groove 11 and the positioning and fixing of the plugs 4, preventing foreign objects from entering and improving the overall structural stability.

[0028] Example 1: This invention proposes an obstacle detection and stop control device for a projection screen, comprising a screen guide rail 1 and a projection screen drive control unit. The screen guide rail 1 has a mounting groove 11, within which a detection component 3 is installed. The detection component 3 includes a power supply 32 and a detection module 33. The detection module 33 integrates an attitude sensor and a wireless signal transmitter. The power supply 32 provides power to the attitude sensor and the wireless signal transmitter. The attitude sensor detects attitude changes of the screen guide rail during lifting and generates an obstacle detection signal when the detected attitude change exceeds a preset threshold. The wireless signal transmitter wirelessly transmits the obstacle detection signal to the projection screen drive control unit. The detection module 33 is installed at the end region of the screen guide rail. During operation, the detection component 3 installed at the end region of the screen guide rail 1 monitors the rail attitude in real time. During the projection screen's raising and lowering process, if the bottom of the screen or one side of the guide rail encounters an obstacle, causing the guide rail to tilt, the attitude sensor integrated in the detection module 33 will detect the attitude change of the screen guide rail 1. When this change exceeds a preset threshold, the detection module 33 generates an obstruction signal and transmits it through its integrated wireless signal transmitter. This signal is received by the projection screen drive control unit, which then controls the motor to stop or reverse, achieving obstruction protection and effectively preventing screen tearing, guide rail deformation, or motor overload, thus improving the safety and reliability of the projection screen. Throughout the process, the power supply 32 provides operating power to the attitude sensor and wireless signal transmitter in the detection module 33. The mounting slot 11 is used to accommodate and fix the detection component 3, ensuring its stable operation. The detection component 3 is installed at the left or right end of the screen guide rail 1. The detection module 33 also includes a microcontroller, which is electrically connected to the attitude sensor and wireless signal transmitter. The microcontroller is powered by the power supply 32 and processes the data collected by the attitude sensor, generating an obstruction signal when a continuous abnormal attitude change is detected. When the screen encounters an obstacle during operation, one end of the guide rail undergoes a change in posture. The posture sensor collects this change data and transmits it to the microcontroller in the detection module 33. By placing the detection component 3 at the left or right end of the screen guide rail 1, it can accurately capture posture changes caused by unilateral obstruction, improving detection sensitivity and accuracy. The microcontroller, powered by power supply 32, processes the received data to determine if there is a continuous abnormal posture change. When the preset conditions are met, the microcontroller generates an obstruction signal and sends it to the projection screen drive control unit via a wireless signal transmitter electrically connected to it, triggering the motor to stop or reverse, thus achieving automatic protection.

[0029] The attitude sensor is a level sensor, used to monitor the tilt angle of the screen guide rail 1 in real time during its lifting and lowering process. The sensing axis of the level sensor is perpendicular to the length direction of the screen guide rail 1. This level sensor monitors the changes in the tilt angle of the screen guide rail 1 during lifting and lowering. When the screen guide rail 1 tilts to one side due to an obstacle at its bottom, the level sensor detects its attitude deviation relative to the direction of gravity. Because the sensing axis of the level sensor is perpendicular to the length direction of the screen guide rail 1, it can sensitively respond to the rotation or tilting of the guide rail in the vertical plane, thereby accurately capturing the attitude anomalies at the end of the guide rail and providing reliable data for the subsequent generation of an obstruction signal. The wireless signal transmitter is an RF signal transmitter, used to send the obstruction signal to the drive control unit of the projection screen via radio frequency. The drive control unit is equipped with a wireless signal receiver matched with the RF signal transmitter. The RF signal transmitter is used to wirelessly transmit the signal to the drive control unit of the projection screen via radio frequency after receiving the obstruction signal. The drive control unit is equipped with a wireless signal receiver that matches the RF signal transmitter to receive and analyze the radio frequency signal. After confirming that the signal is valid, the drive control unit immediately controls the drive motor to stop running or perform a reverse action to achieve timely protection of the projection screen.

[0030] The detection component 3 includes a housing 31, with a power supply 32 and a detection module 33 all housed inside the housing 31. A partition is provided inside the housing 31, separating the power supply 32 and the detection module 33 to prevent electrical interference or short circuits between them. A sealing cap is provided at the open end of the housing 31, with a sealing ring between the cap and the housing to seal the internal space, enhancing the housing 31's waterproof and dustproof capabilities and adapting to complex operating environments. The housing 31 is interference-fitted with the mounting groove 11 or fixed with screws, ensuring stable installation of the detection component 3 during lifting and lowering, unaffected by vibration or external forces, and guaranteeing continuous and reliable operation of the internal components.

[0031] The screen guide rail 1 is installed at the bottom of the projection screen to provide counterweight and keep the screen flat. The top of the screen guide rail 1 has a through groove 12 extending along its length. The bottom edge of the projection screen is accommodated in the through groove 12 to connect and guide the screen to the guide rail. The bottom of the screen guide rail 1 is covered by a bottom shell 2 to seal the internal space. Both ends of the screen guide rail 1 are provided with plugs 4. One side of the plug 4 is provided with an insert 41. The insert 41 is inserted into the end of the mounting groove 11 to seal the end of the mounting groove 11 and fix the plug 4, preventing foreign objects from entering and improving the overall structural stability.

[0032] Specifically, the working principle of this utility model is as follows: When the device is in operation, the detection component 3 is installed at the left or right end of the screen guide rail 1 to monitor changes in the rail's posture in real time. The screen guide rail 1 is installed at the bottom of the projection screen to provide counterweight for flattening the screen. Its top has a through groove 12 extending along its length, and the bottom edge of the projection screen is accommodated within the through groove 12 for stable connection and guidance. When the projection screen is raised or lowered, if the bottom or one side of the guide rail encounters an obstacle, causing the rail to tilt, the posture sensor integrated in the detection module 33 will detect the abnormal posture. This posture sensor is a level sensor, and its sensing axis is perpendicular to the length direction of the screen guide rail 1, enabling it to sensitively respond to any flipping or tilting of the rail in the vertical plane.

[0033] The tilt angle data collected by the attitude sensor is transmitted to the microcontroller within the detection module 33. Powered by power supply 32, the microcontroller processes the received data to determine if there is a continuous abnormal attitude change. When the tilt angle deviates from the horizontal reference plane by more than a preset threshold and the duration meets the set conditions, the microcontroller determines it as a valid obstruction event and generates an obstruction signal. This signal is transmitted through a wireless signal transmitter integrated into the detection module 33. This wireless signal transmitter is an RF signal transmitter, which wirelessly transmits the signal to the projection screen drive control unit via radio frequency. The drive control unit is equipped with a wireless signal receiver matched to the RF signal transmitter to receive and analyze the signal.

[0034] After confirming the validity of the obstruction signal, the drive control unit immediately cuts off the power supply to the drive motor or issues a reverse command to control the motor to stop running or rotate in the opposite direction, so as to realize the automatic stop or retraction of the curtain and avoid further stress. The detection component 3 is housed inside the box 31. The power supply 32 and the detection module 33 are separated by a partition inside the box 31 to prevent electrical interference. The box 31 is fixed in the mounting groove 11 of the curtain guide rail 1 by interference fit or screws. The open end is equipped with a sealing cover and sealing ring to ensure waterproof and dustproof. The plugs 4 at both ends are inserted into the ends of the mounting groove 11 by inserts 41 to achieve end closure. The bottom shell 2 covers the bottom of the curtain guide rail 1 to further improve the structural sealing and stability and ensure the reliable operation of the entire detection system in complex environments.

[0035] In summary, this invention solves the problem that existing electric projection screens lack an automatic stop function upon encountering an obstacle, which can easily lead to equipment damage and safety risks. It should be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information. In addition, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. An obstacle detection and stop control device for a projection screen, comprising a screen guide rail (1) and a projection screen drive control unit, characterized in that, The screen guide rail (1) is equipped with a detection component (3). The detection component (3) includes a power supply (32) and a detection module (33). The detection module (33) integrates an attitude sensor and a wireless signal transmitter. The power supply (32) is used to power the attitude sensor and the wireless signal transmitter. The attitude sensor is used to detect the attitude change of the screen guide rail during the lifting process and generate an obstruction signal when the detected attitude change exceeds a preset threshold. The wireless signal transmitter is used to wirelessly send the obstruction signal to the projection screen drive control unit.

2. The obstacle detection and stop control device for a projection screen according to claim 1, characterized in that, The detection component (3) is installed at the end area of ​​the left or right end of the curtain guide rail (1). The detection module (33) also includes a microcontroller. The microcontroller is electrically connected to the attitude sensor and the wireless signal transmitter. The microcontroller is powered by the power supply (32). The microcontroller is used to process the data collected by the attitude sensor and generate an obstruction signal when it is determined that there is a continuous abnormal attitude change.

3. The resistance detecting and stopping control device for a projection screen according to claim 1, wherein The attitude sensor is a level sensor, which is used to monitor the tilt angle of the curtain guide rail (1) in real time during the lifting and lowering process. The sensing axis of the level sensor is perpendicular to the length direction of the curtain guide rail (1).

4. The resistance detecting and stopping control device for a projection screen according to claim 1, wherein The wireless signal transmitter is an RF signal transmitter, which is used to send an obstruction signal to the drive control unit of the projection screen via radio frequency. The drive control unit is equipped with a wireless signal receiver that matches the RF signal transmitter.

5. The resistance detecting and stopping control device for a projection screen according to claim 1, wherein The detection component (3) includes a housing (31), and the power supply (32) and the detection module (33) are both housed inside the housing (31); the housing (31) is provided with a partition, and the power supply (32) and the detection module (33) are separated by the partition.

6. The obstacle detection and stop control device for a projection screen according to claim 5, characterized in that, The box body (31) has a sealing cover at the opening end, and a sealing ring is provided between the sealing cover and the box body. The curtain guide rail (1) has an installation groove (11), and the box body (31) is set in the installation groove (11). The box body (31) and the installation groove (11) are interference fit or fixed by screws.

7. The obstacle detection and stop control device for a projection screen according to claim 1, characterized in that, The screen guide rail (1) is installed at the bottom of the projection screen. The top of the screen guide rail (1) is provided with a through groove (12) extending along its length direction. The bottom edge of the projection screen is accommodated in the through groove (12).

8. The obstacle detection and stop control device for a projection screen according to claim 6, characterized in that, The bottom of the curtain guide rail (1) is covered by a bottom shell (2), and the two ends of the curtain guide rail (1) are provided with plugs (4). A plug (41) is provided on one side of the plug (4), and the plug (41) is inserted into the end of the mounting groove (11).

9. The obstacle detection and stop control device for a projection screen according to claim 1, characterized in that, The detection module (33) is installed in the end area of ​​the curtain guide rail.

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