A height-lockable floor-mounted screen and a locking control method thereof.

Abstract

This invention relates to the field of floor-mounted projection screen technology, specifically a floor-mounted screen with lockable screen height and a locking control method. An MCU module controls a motor to drive a rotating rod to rotate clockwise or counterclockwise to release the screen, and a monitoring module monitors the motor's operation in real time. When the desired position is reached, the MCU module stops the motor and simultaneously controls an electric push rod to drive a toothed locking module to act on a slide block. The interaction between the toothed locking module and the slide block achieves engagement and locking. This device is not only simple in structure, but also intelligently opens and retracts the screen using the control method provided, and can achieve locking control at a predetermined opening angle. This avoids the tediousness of manual operation and provides excellent control performance.

Description

Technical Field

[0001] This invention relates to the field of floor-mounted projection screen technology, and in particular to a floor-mounted screen with a lockable screen height and a locking control method. Background Technology

[0002] A projection screen, also called a projection display, needs to be used in conjunction with a projector to achieve the purpose of projecting displays onto a screen surface.

[0003] Currently, traditional motorized screens need to be fixed in a certain top area (such as the ceiling, the top of the wall, etc.) to function properly. Once the motorized screen is completely fixed, it cannot be easily moved. In addition, fixing a traditional motorized screen to a wall requires damage to the wall and the use of professional installation tools. Moreover, in order to ensure the user experience of the motorized screen, the installation position of the screen needs to be repeatedly aligned during the installation process. The whole installation process is laborious and time-consuming.

[0004] The foldable component that supports the curtain includes a first drive rod and a second drive rod that are vertically distributed and hinged to each other. The foldable component is provided with an elastic element for unfolding the foldable component. The elastic element is located on the inner side of the first drive rod, and the other end of the elastic element is connected to the second drive rod with a traction element. One end of the traction element is fixed to the inner side of the second drive rod. The elastic element is a spring structure, and the traction element is a rope structure.

[0005] In this type of electrically operated floor-lifting screen, the screen unfolds entirely through the action of a spring-loaded foldable component (two drive rods that can be folded and connected to each other). During the unfolding process, the motor drives the screen to open, and the screen moves vertically upward under the restoring force of the foldable component. During the retraction process, the motor drives the screen to descend and folds the foldable component. When the screen is fully retracted, the elasticity of the foldable component reaches its maximum and is suppressed by the tension generated by the screen.

[0006] Since the opening angle of the foldable component is driven by an internal spring, the tension spring will undergo irreversible deformation during long-term use, which will lead to a decrease in the support effect on the screen. This is mainly reflected in the reduced lifting height of the screen, while the stroke released by the motor remains unchanged, causing the screen to sag (slack), and the projection effect will be greatly reduced.

[0007] To address this technical problem, a feasible solution is to manually maintain the first and second drive rods at the optimal opening angle, for example, by placing a stop block at the optimal opening angle; or by tightening the connecting shaft at the hinge, locking the hinge between the first and second drive rods. However, this method increases the complexity of operation and may even cause irreversible damage to the floor-mounted screen. For example, tightening the connecting shaft at the hinge may cause the hinge to break if too much force is applied.

[0008] Therefore, there is an urgent need for a technology to solve the above-mentioned technical problems. Summary of the Invention

[0009] The purpose of this invention is to overcome the problems of the prior art and provide a ground-lifting screen with lockable screen height and a locking control method. This invention addresses the technical problem that traditional electric screens experience a decrease in the support force of the drive rod during long-term use, which leads to the inability to effectively support the screen longitudinally, resulting in screen sagging or loosening and affecting the projection effect.

[0010] The above objectives are achieved through the following technical solutions:

[0011] A height-lockable floor-mounted screen includes a screen storage box placed on the ground for storing a foldable drive rod, screen, motor, and rotating rod. A cover plate is connected to the top of the screen, and the cover plate can be fastened to the screen storage box to form a sealed cavity. The screen storage box contains a first region and a second region that are parallel to each other. There is a pair of drive rods, respectively located on the left and right sides of the second region. Each pair includes a first drive rod and a second drive rod that are hinged to each other. The top of the first drive rod is hinged to the cover plate, and the bottom of the second drive rod is hinged to the screen storage box. The bottom of the first drive rod and the top of the second drive rod are also hinged together.

[0012] The rotating rod is connected to the rotating rod of the motor and is located in the first area. The rotating rod is bonded to the bottom end of the curtain and can be used to wrap the curtain.

[0013] The second drive rod includes an open groove, and a double-track slide rail is provided along the port of the open groove for the slide block to slide on. One end of the slide block is hinged to a support rod, and the other end of the support rod is hinged to the first drive rod. A toothed plate is provided at the bottom of the slide block, and a toothed locking module is provided in the open groove accordingly. The toothed locking module is driven by an electric push rod to lock the slide block that has slid above the toothed locking module.

[0014] It also includes an MCU module, which is connected to the motor and the electric actuator respectively, and is used to control the start and stop of the motor and the electric actuator;

[0015] A monitoring module is connected to the motor. The monitoring module is used to monitor the status of the motor in real time and feed back the status information to the MCU module in real time.

[0016] Furthermore, the open slot includes a pair of symmetrical open slot sides, and an outwardly protruding arc-shaped flange is provided along the top of the open slot side. The two sets of arc-shaped flanges constitute the double-track slide rail. The slide block includes a set of symmetrical slide block sides, and an arc-shaped slide block groove matching the arc-shaped flange and capable of clamping it is opened along the inner wall of the slide block side. The slide block is driven by the support rod to slide along the double-track slide rail.

[0017] Furthermore, the toothed locking module includes a connecting seat, a toothed seat, and a push block that are fixedly connected to the open groove, and the connecting seat has a push block slide groove in the middle for the push block to enter and exit.

[0018] The tooth surface of the tooth holder can mesh with the tooth surface of the tooth plate. The tooth holder is located above the connecting seat. A lifting groove matching the push block slide groove is opened at the middle position of the bottom of the tooth holder. The push block abuts against the top wall of the lifting groove to drive the vertical lifting of the lifting groove. Nut limiting grooves that can limit the nut are also respectively provided on the connecting seat on both sides of the push block slide groove. Correspondingly, a number of T-shaped screw through holes that can penetrate the upper and lower surfaces of the tooth holder are opened on the tooth holder. The T-shaped screw through holes are filled with screws and springs. The screw end can be screwed into the nut set in the nut limiting groove.

[0019] Furthermore, the T-shaped screw through hole includes a spring limiting cavity and a screw through cavity that are interconnected. The spring is disposed in the spring limiting cavity, with one end abutting against the nut of the screw and the other end abutting against the bottom wall of the spring limiting cavity.

[0020] Furthermore, the push block is a right-angled trapezoid, including an inclined surface facing the lifting groove; the end of the push block is connected to the push rod end of the electric push rod, and the electric push rod is fixed to the open groove.

[0021] A locking control method for a floor-mounted screen with lockable screen height, characterized in that it includes:

[0022] When the power is on and the curtain is opened, the MCU module controls the motor to drive the rotating rod to rotate clockwise or counterclockwise to release the curtain, and the monitoring module monitors the motor's operating status in real time.

[0023] When the position is reached, the slide is directly above the toothed locking module. The MCU module then controls the motor to stop working and simultaneously controls the electric push rod to drive the toothed locking module to act on the slide. The interaction between the toothed locking module and the slide achieves engagement and locking.

[0024] When the curtain is rolled up, the MCU module controls the electric push rod to drive the toothed locking module to reset, thus releasing the lock between the toothed locking module and the slide block; the MCU module controls the motor to drive the rotating rod to rotate counterclockwise or clockwise to roll up the curtain, and the monitoring module monitors the motor's operating status in real time;

[0025] Once winding is complete, the MCU module controls the motor to stop working.

[0026] Furthermore, the monitoring module is equipped with a current monitoring unit, which is used to monitor abnormal changes in the current in the motor when the curtain is opened or rolled up, and feeds back the abnormal change information to the MCU module. After receiving the abnormal change information, the MCU module controls the motor to stop working.

[0027] Furthermore, it also includes a current reference value, and the current monitoring unit compares the monitored abnormal change value with the current reference value;

[0028] If the abnormal change value is greater than the safe value, then the abnormal change information will be fed back to the MCU module.

[0029] If the abnormal change value is less than or equal to the safe value, monitoring will continue.

[0030] Furthermore, the monitoring module is equipped with an encoder monitoring unit, which is used to monitor the number of revolutions of the motor after it starts working;

[0031] When the curtain is opened or rolled up, the encoder monitoring unit monitors the number of rotations of the motor. If the number of rotations is equal to a preset reference value, the encoder monitoring unit sends a positioning signal to the MCU module. Upon receiving the positioning signal, the MCU module controls the motor to stop working.

[0032] Furthermore, the preset number of rotations reference value = the effective height of the curtain / the circumference of the rotating rod. Beneficial effects

[0033] This invention provides a height-lockable floor-mounted screen and a locking control method. A support rod is hinged to a first drive rod, and the other end of the support rod is hinged to a slide block that slides along a second drive rod. When the first and second drive rods open or retract at an angle, the support rod is forced to drive the slide block to slide along the second drive rod. A toothed locking module is pre-installed on the second drive rod corresponding to the optimal screen unfolding height. When the slide block slides above the toothed locking module, the built-in MCU module intelligently controls an electric push rod to drive a push block to act on the toothed locking module. The toothed locking module is pressed up, achieving engagement and locking with the slide block. When the screen needs to be rolled up, the MCU module intelligently controls the electric push rod to pull back the push block, thus resetting the toothed locking module and allowing the slide block to slide freely. This device is not only simple in structure, but also intelligently opens and retracts the screen using the control method provided, and can achieve locking control at a predetermined opening angle. This not only avoids the tediousness of manual operation but also provides excellent control performance. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the module control in the locking control method of a ground-lifting screen with lockable screen height according to the present invention;

[0035] Figure 2 This is a diagram illustrating the usage state of a floor-mounted screen with lockable screen height as described in this invention.

[0036] Figure 3 A schematic diagram showing the connection between the internal tension spring and the traction rope of the drive rod of a traditional floor-mounted curtain.

[0037] Figure 4 This is a schematic diagram of the structure of a ground-lift screen with lockable screen height according to the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of a ground-lifting screen with lockable screen height after removing the second drive rod, as described in this invention.

[0039] Figure 6 This is a schematic diagram of the connecting seat and toothed seat structure of a ground-lifting screen with lockable screen height according to the present invention;

[0040] Figure 7 This is a schematic diagram of the sliding structure of a floor-lifting screen with lockable screen height according to the present invention;

[0041] Figure 8 This is a diagram showing the state of a ground-lift screen with lockable screen height as described in this invention before locking.

[0042] Figure 9 This is a diagram showing the locked state of a floor-mounted screen with a lockable screen height as described in this invention.

[0043] Illustration markings:

[0044] 1-First drive lever;

[0045] 2-Second drive rod;

[0046] 3-Open groove, 31-Open groove side, 32-Arched flange;

[0047] 4-Slide block, 41-Slide block side, 42-Slide block groove, 43-Gear plate;

[0048] 5-Double track slide rail;

[0049] 6-Support rod;

[0050] 7-Electric linear actuator;

[0051] 8-Toothed locking module, 81-Connecting seat, 82-Toothed seat, 83-Push block, 84-Push block slide groove, 85-Inclined surface, 86-Lifting groove, 87-Nut, 88-Nut limiting groove, 89-T-shaped screw through hole, 810-Spring limiting cavity, 811-Screw through cavity, 812-Screw, 813-Spring, 814-Wing edge;

[0052] 9-Traction rope, 10-Curtain storage box, 11-Cover plate, 12-Rotating rod, 13-Motor, 14-Curtain, 15-Tension spring, 16-MCU module, 17-Monitoring module, 18-Current monitoring unit, 19-Encoder monitoring unit. Detailed Implementation

[0053] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. The described embodiments are merely some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] like Figures 2-4 As shown, this solution provides a ground-lifting screen with a lockable screen height, including a screen storage box 10 placed on the ground for storing a foldable drive rod, a screen 14, a motor 13, and a rotating rod 12. The top of the screen 14 is connected to a cover plate 11, which can be fastened to the screen storage box 10 to form a sealed cavity. The screen storage box 10 is characterized in that a first region and a second region are provided inside the screen storage box 10. There is a pair of drive rods, which are respectively provided on the left and right sides of the second region. Each pair includes a first drive rod 1 and a second drive rod 2 that are hinged to each other. The top of the first drive rod 1 is hinged to the cover plate 11, and the bottom of the second drive rod 2 is hinged to the screen storage box 10. The bottom of the first drive rod 1 and the top of the second drive rod 2 are hinged to each other.

[0055] The rotating rod 12 is connected to the rotating shaft of the motor 13 and is located in the first area. The rotating rod 12 is bonded to the bottom end of the curtain 14 and can be wrapped around the curtain 14.

[0056] The second drive rod 2 includes an open groove 3, and a double-track slide rail 5 is provided along the port of the open groove 3 for the slide block 4 to slide. One end of the slide block 4 is hinged to a support rod 6, and the other end of the support rod 6 is hinged to the first drive rod 1. A toothed plate 43 is provided at the bottom of the slide block 4, and a toothed locking module 8 is provided in the open groove 3. The toothed locking module 8 is driven by an electric push rod 7 to lock the slide block 4 that has slid above the toothed locking module 8.

[0057] It also includes an MCU module 16, which is connected to the motor 13 and the electric push rod 7 respectively, and is used to control the start and stop of the motor 13 and the electric push rod 7;

[0058] A monitoring module 17 is connected to the motor 13. The monitoring module 17 is used to monitor the status of the motor 13 in real time and feed back the status information to the MCU module 16 in real time.

[0059] Specifically, such as Figure 3 As shown, both the first drive rod 1 and the second drive rod 2 include hollow cavities. A tension spring 15 is provided in the cavity of the first drive rod 1. One end of the tension spring 15 is connected to a hook or support column provided on the inner wall of the cavity of the first drive rod 1, and the other end is directly or through a traction rope 9 that passes around the hinge and is connected to a hook or support column on the inner wall of the cavity of the second drive rod 2. The traction rope 9 can be made of high-strength steel wire rope.

[0060] Working principle:

[0061] When the first drive rod 1 and the second drive rod 2 are fully folded, the tension of the tension spring 5 reaches its maximum, and the curtain is in the rolled-up state. When the motor 13 drives the rotating rod 12 to rotate the rolled-up curtain 14 in the opposite direction, the pressure acting on the first drive rod 1 and the second drive rod 2 is gradually released. Under the influence of the restoring force of the tension spring, the first drive rod 1 and the second drive rod 2 perform an opening movement, thereby achieving vertical support for the curtain 14 and realizing the purpose of opening the curtain 14.

[0062] The larger the angle between the first drive rod 1 and the second drive rod 2, the smaller the tension of the tension spring 16.

[0063] like Figure 8 and 9As shown, as the curtain 14 is successively released by the rotating rod 12 driven by the motor 13, the opening angle of the first driving rod 1 and the second driving rod 2 continuously increases. During this process, the support rod 6, which is hinged to the first driving rod 1, will drive the slide 4 to rise and slide on the second driving rod 2. When the slide 4 slides above the toothed locking module 8, the central control system controls the electric push rod 7 to drive the push block 83 to act on the toothed locking module 8. The toothed locking module 8 is pressed up to achieve engagement and locking with the slide 4.

[0064] When it is time to roll up the curtain, the central control system controls the electric push rod 7 to pull back the push block 83, then the toothed locking module 8 resets, and the slide can slide freely so that the first drive rod 1 and the second drive rod 2 can be folded flat relative to each other.

[0065] It should be noted that the software control program and other related components involved in this embodiment are not within the scope of protection of this patent.

[0066] like Figure 4 As shown, in this embodiment, the open groove 3 includes a pair of symmetrical open groove sides 31, and an outwardly protruding arc-shaped flange 32 is provided along the top of the open groove side 31. The two sets of arc-shaped flanges 32 constitute the double track slide rail 5.

[0067] like Figure 7 As shown, the slide block 4 includes a set of mutually symmetrical slide block sides 41. An arc-shaped slide block groove 42 is formed along the inner wall of the slide block side 41 to match and clamp the arc-shaped flange 32. The slide block 4 is driven by the support rod 6 to slide along the double track slide rail 5.

[0068] like Figure 5 and 6 As shown, the toothed locking module 8 in this embodiment includes a connecting seat 81, a toothed seat 82, and a push block 83 that are fixedly connected to the open groove 3. The middle part of the connecting seat 81 is provided with a push block slide groove 84 for the push block 83 to enter and exit.

[0069] The tooth surface of the tooth seat 82 can mesh with the tooth surface of the tooth plate 43. The tooth seat 82 is located above the connecting seat 81. A lifting groove 86 matching the push block slide groove 84 is opened at the middle position of the bottom of the tooth seat 82. The push block 83 abuts against the top wall of the lifting groove 86 to drive the vertical lifting of the lifting groove 86.

[0070] Specifically, nut limiting grooves 88 that can limit the nut 87 are respectively provided on the connecting seat 81 corresponding to both sides of the push block slide groove 84.

[0071] Correspondingly, a plurality of T-shaped screw through holes 89 are provided on the tooth seat 82, which can penetrate the upper and lower surfaces of the tooth seat 82. The T-shaped screw through holes 89 are filled with screws 812 and springs 813. The screw end of the screw 812 can be screwed into the nut 87 provided in the nut limiting groove 88.

[0072] like Figure 8 and 9 As shown, the T-shaped screw through hole 89 includes a spring limiting cavity 810 and a screw through cavity 811 that are interconnected. The spring 813 is disposed in the spring limiting cavity 810, with one end abutting against the nut of the screw 812 and the other end abutting against the bottom wall of the spring limiting cavity 810.

[0073] To ensure that the force is evenly distributed throughout the slide block 4, in this embodiment, each nut limiting groove 88 corresponds to three screws 812.

[0074] like Figure 6 As shown, as the connection structure between the toothed locking module 8 and the second drive rod 2 in this embodiment, a connecting seat through groove (not labeled) is provided on the bottom wall of the open groove 3 for the connecting seat 81 to be partially embedded.

[0075] Correspondingly, symmetrical wings 814 are provided on both sides of the connecting seat 81, and the wings 814 are connected and fixed to the bottom wall of the open groove 3 by screws.

[0076] In this embodiment, the pusher block 83 is in the shape of a right angle and includes an inclined surface 85. The inclined surface 85 faces the lifting groove 86 so that it can be smoothly inserted into the lifting groove 86 to lift it.

[0077] The end of the push block 83 is connected to the push rod end of the electric push rod 7, and the electric push rod 7 is fixed to the open groove 3. When the electric push rod 7 is not working, it will drive the push block 83 to be outside the slide groove. At this time, the slide block 4 is subjected to force and its sliding is not disturbed by the holding and locking module 8. When the electric push rod 7 is working, it will drive the push block 83 to extend into the slide groove one after another. At this time, the slide block 4 is subjected to the action of the rising tooth seat 82 below, realizing the meshing and locking between it and the tooth plate 43.

[0078] As an optimization of the height of the push block 83, the height of the push block 83 is higher than the height inside the groove after the lifting groove 86 and the push block slide groove 84 are in contact; the inclination angle of the inclined surface 85 is 10° to 70°.

[0079] In addition, such as Figure 1 As shown, for the aforementioned floor-mounted screen with lockable screen height, this embodiment also provides a locking control method for the floor-mounted screen with lockable screen height, including:

[0080] When the power is on and the curtain is opened, the MCU module 16 controls the motor 13 to drive the rotating rod 12 to rotate clockwise or counterclockwise to release the curtain 14, and the monitoring module 17 monitors the operation status of the motor 13 in real time.

[0081] When the position is reached, the slide block 4 is located directly above the toothed locking module 8. The MCU module 16 controls the motor 13 to stop working and simultaneously controls the electric push rod 7 to drive the toothed locking module 8 to act on the slide block 4. The toothed locking module 8 and the slide block 4 interact to achieve engagement and locking.

[0082] When the curtain is rolled up, the MCU module 16 controls the electric push rod 7 to drive the toothed locking module 8 to reset, thereby releasing the lock between the toothed locking module 8 and the slide block 4; the MCU module 16 controls the motor 13 to drive the rotating rod 12 to rotate counterclockwise or clockwise to roll up the curtain 14, and the monitoring module 17 monitors the operating status of the motor 13 in real time;

[0083] Once winding is complete, the MCU module 16 controls the motor 13 to stop working.

[0084] The monitoring module 17 provides two monitoring methods:

[0085] Monitoring Method 1

[0086] The monitoring module 17 is equipped with a current monitoring unit 18, which is used to monitor abnormal changes in the current in the motor 13 when the curtain is opened or rolled up, and feeds back the abnormal change information to the MCU module 16. After receiving the abnormal change information, the MCU module 16 controls the motor 13 to stop working.

[0087] This also includes a current reference value, and the current monitoring unit 18 compares the monitored abnormal change value with the current reference value;

[0088] If the abnormal change value is greater than the safe value, then the abnormal change information will be fed back to the MCU module 16;

[0089] If the abnormal change value is less than or equal to the safe value, monitoring will continue.

[0090] Monitoring Method Two

[0091] The monitoring module 17 is equipped with an encoder monitoring unit 19, which is used to monitor the number of revolutions of the motor after it is working;

[0092] When the curtain is opened or rolled up, the encoder monitoring unit 19 monitors the number of rotations of the motor 13. If the number of rotations is equal to a preset reference value, the encoder monitoring unit 19 sends a positioning signal to the MCU module 16. After receiving the positioning signal, the MCU module 16 controls the motor 13 to stop working.

[0093] Wherein, the preset number of rotations reference value = the effective height of the curtain 14 / the circumference of the rotating rod 12.

[0094] The above description is merely illustrative of the embodiments of the present invention and is not intended to limit the present invention. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A ground-mounted screen with lockable screen height, comprising a screen storage box (10) placed on the ground for storing a foldable drive rod, a screen (14), a motor (13), and a rotating rod (12), wherein a cover plate (11) is connected to the top of the screen (14), and the cover plate (11) can be fastened with the screen storage box (10) to form a sealed cavity; characterized in that, The curtain storage box (10) is provided with a first area and a second area that are parallel to each other; there is a pair of drive rods, which are respectively provided on the left and right sides of the second area. Each pair includes a first drive rod (1) and a second drive rod (2) that are hinged to each other. The top of the first drive rod (1) is hinged to the cover plate (11), and the bottom of the second drive rod (2) is hinged to the curtain storage box (10). The bottom of the first drive rod (1) and the top of the second drive rod (2) are hinged to each other. The rotating rod (12) is connected to the rotating shaft of the motor (13) and is located in the first area. The rotating rod (12) is bonded to the bottom end of the curtain (14) and can be wrapped around the curtain (14). The second drive rod (2) includes an open groove (3), and a double track slide rail (5) is provided along the port of the open groove (3) for the slide block (4) to slide. One end of the slide block (4) is hinged to a support rod (6), and the other end of the support rod (6) is hinged to the first drive rod (1). A toothed plate (43) is provided at the bottom of the slide block (4), and a toothed locking module (8) is provided in the open groove (3). The toothed locking module (8) is driven by an electric push rod (7) to lock the slide block (4) that has slid to the top of the toothed locking module (8). It also includes an MCU module (16), which is connected to the motor (13) and the electric push rod (7) respectively, and is used to control the start and stop of the motor (13) and the electric push rod (7); A monitoring module (17) is connected to the motor (13). The monitoring module (17) is used to monitor the status of the motor (13) in real time and feed the status back to the MCU module (16) in real time.

2. The floor-mounted screen with lockable screen height according to claim 1, characterized in that, The open slot (3) includes a pair of symmetrical open slot sides (31), and an outwardly protruding arc-shaped flange (32) is provided along the top of the open slot side (31). The two sets of arc-shaped flanges (32) constitute the double track slide rail (5). The slide seat (4) includes a set of symmetrical slide seat sides (41), and an arc-shaped slide seat groove (42) matching the arc-shaped flange (32) and clamping it is provided along the inner wall of the slide seat side (41). The slide seat (4) is driven by the support rod (6) to slide along the double track slide rail (5).

3. A floor-mounted screen with lockable screen height according to claim 1, characterized in that, The toothed locking module (8) includes a connecting seat (81), a toothed seat (82) and a push block (83) fixedly connected to the open groove (3). The middle part of the connecting seat (81) is provided with a push block groove (84) for the push block (83) to enter and exit. The tooth surface of the tooth seat (82) can mesh with the tooth surface of the tooth plate (43). The tooth seat (82) is located above the connecting seat (81). A lifting groove (86) matching the push block slide groove (84) is opened along the middle position of the bottom of the tooth seat (82). The push block (83) abuts against the top wall of the lifting groove (86) to realize the vertical lifting of the lifting groove (86). The tooth surface of the tooth seat (82) can mesh with the tooth surface of the tooth plate (43). The tooth seat (82) is located above the connecting seat (81). A lifting groove (86) matching the push block slide groove (84) is opened along the middle position of the bottom of the tooth seat (82). The push block (83) abuts against the top wall of the lifting groove (86) to realize the vertical lifting of the lifting groove (86). The tooth surface of the tooth seat (82) is located along the middle position of the bottom of the tooth seat (82). The connecting seat (81) is also provided with a nut limiting groove (88) that can limit the nut (87). Correspondingly, a number of T-shaped screw through holes (89) that can penetrate the upper and lower surfaces of the tooth seat (82) are provided on the tooth seat (82). The T-shaped screw through holes (89) are filled with screws (812) and springs (813). The screw end of the screw (812) can be screwed into the nut (87) provided in the nut limiting groove (88).

4. A floor-mounted screen with lockable screen height according to claim 3, characterized in that, The T-shaped screw through hole (89) includes a spring limiting cavity (810) and a screw through cavity (811) that are interconnected. The spring (813) is disposed in the spring limiting cavity (810), with one end abutting against the nut of the screw (812) and the other end abutting against the bottom wall of the spring limiting cavity (810).

5. A floor-mounted screen with lockable screen height according to claim 3, characterized in that, The push block (83) is a right trapezoid and includes an inclined surface (85) facing the lifting groove (86); the end of the push block (83) is connected to the push rod end of the electric push rod (7), and the electric push rod (7) is fixed to the open groove (3).

6. The locking control method for a floor-mounted screen with lockable screen height according to any one of claims 1-5, characterized in that, include: When the power is on and the curtain is opened, the MCU module (16) controls the motor (13) to drive the rotating rod (12) to rotate clockwise or counterclockwise to release the curtain (14), and the monitoring module (17) monitors the operation status of the motor (13) in real time. When the position is reached, the slide (4) is located directly above the toothed locking module (8). The MCU module (16) controls the motor (13) to stop working and controls the electric push rod (7) to drive the toothed locking module (8) to act on the slide (4). The toothed locking module (8) and the slide (4) interact to achieve engagement and locking. When the curtain is rolled up, the electric push rod (7) is controlled by the MCU module (16) to drive the toothed locking module (8) to reset, and the lock between the toothed locking module (8) and the slide (4) is released; the MCU module (16) controls the motor (13) to drive the rotating rod (12) to rotate counterclockwise or clockwise to roll up the curtain (14), and the operating status of the motor (13) is monitored in real time by the monitoring module (17); Once the winding is complete, the MCU module (16) controls the motor (13) to stop working.

7. The locking control method for a floor-mounted screen with lockable screen height according to claim 6, characterized in that, The monitoring module (17) is equipped with a current monitoring unit (18). The current monitoring unit (18) is used to monitor the abnormal change value of the current in the motor (13) when the curtain is opened or rolled up. The abnormal change value is fed back to the MCU module (16). After receiving the abnormal change value, the MCU module (16) controls the motor (13) to stop working.

8. The locking control method for a floor-mounted screen with lockable screen height according to claim 7, characterized in that, It also includes a current reference value, and the current monitoring unit (18) compares the monitored abnormal change value with the current reference value; If the abnormal change value is greater than the current reference value, the abnormal change value is fed back to the MCU module (16). If the abnormal change value is less than or equal to the current reference value, continue monitoring.

9. The locking control method for a floor-mounted screen with lockable screen height according to claim 6, characterized in that, The monitoring module (17) is equipped with an encoder monitoring unit (19), which is used to monitor the number of revolutions of the motor after it is working; When the curtain is opened or rolled up, the encoder monitoring unit (19) monitors the number of rotations of the motor (13). If the number of rotations is equal to the preset reference value, the encoder monitoring unit (19) sends a positioning signal to the MCU module (16). After receiving the positioning signal, the MCU module (16) controls the motor (13) to stop working.

10. The locking control method for a floor-mounted screen with lockable screen height according to claim 9, characterized in that, The preset number of turns reference value = the effective height of the curtain (14) / the circumference of the rotating rod (12).

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