Wall matrix screen device capable of stretching back and forth

Abstract

A wall matrix screen device capable of stretching back and forth belongs to the technical field of matrix screens and comprises a screen and a frame mechanism, the frame mechanism is divided into a front side frame mechanism, a middle side frame mechanism and a rear side frame mechanism, and one end of a first connecting rod is rotatably connected to the rear side frame mechanism; the other end of the first connecting rod is rotationally connected with a second connecting rod. The position of the screen can be flexibly adjusted, compared with a traditional fixedly-installed screen, the flexibility of the screen information display distance is increased, the display effect of the screen at different front and back positions can be better achieved, every two adjacent screen units are in the coplanar state and the front and back staggered state, and the display effect is good. The screen units in the coplanar state can integrally display screen information, the screen units in the front-back staggered state can display the screen information in a partitioned front-back staggered mode, the two use states can be flexibly adjusted, and the use requirements of different display places are met.

Description

Technical Field

[0001] The utility model belongs to the technical field of matrix screens, and in particular relates to a wall matrix screen device which can be telescopically moved forward and backward. Background Art

[0002] A screen is a device or appliance used to display images and colors. It is widely used in mobile phones, computers, monitors, televisions, and devices with image or text display functions. A matrix screen is a screen that uses a matrix to achieve image splicing effects. Common splicing can be roughly divided into hardware splicing and software splicing. The former requires professional splicing equipment to achieve, such as: large-screen splicing processors; the latter requires the splicing screen to achieve the splicing effect through splicing software applications.

[0003] The related technology (publication number CN217690423U) discloses a matrix transparent LED screen, including a matrix screen, a plug-in block is fixedly installed on the bottom surface of the matrix screen, a slide groove is opened on the inner wall of the plug-in board, a plug-in block is fixedly installed through the bottom surface of the matrix screen, a movable groove is opened on the inner wall of the plug-in block, and a plug-in board is fixedly installed on the bottom surface of the matrix screen. The outer wall of the plug-in block slides along the inner cavity of the slide groove, synchronously driving the outer wall of the guide plate to squeeze one end of the top pressure spring and shrink along the inner cavity of the movable groove. When the outer wall of the movable block slides along the inner cavity of the slide groove to the inner cavity of the positioning groove, the outer wall of the movable block is not squeezed, and the top pressure spring in the inner cavity of the movable groove releases the elastic force to press the movable block, so that the outer wall of the movable block and the inner cavity of the positioning groove are slidably plugged in to complete the splicing of the matrix screen, thereby solving the problem of cumbersome operation of fixing each LED screen by bolt cooperation, and achieving a more efficient and simple effect.

[0004] However, the existing matrix screen is usually fixed on the wall and cannot be flexibly extended and moved in the front and back directions. The flexibility of the screen information display distance is low, and it is difficult to meet the display effect of the screen at different front and back positions. Utility Model Content

[0005] In view of the problems existing in the prior art, the existing matrix screen is usually fixed on the wall, and cannot be flexibly extended and moved in the front and back directions. The flexibility of the screen information display distance is low, and it is difficult to meet the display effects of the screen at different front and back positions. The utility model provides a wall matrix screen device that can be extended and retracted forward and backward, which can flexibly adjust the position of the screen. Compared with the traditional fixed-installed screen, it increases the flexibility of the screen information display distance and can better meet the display effects of the screen at different front and back positions. The specific technical solution is as follows:

[0006] A wall matrix screen device that can be telescopically moved forward and backward comprises a screen and a frame mechanism, wherein the frame mechanism is divided into a front frame mechanism, a middle frame mechanism and a rear frame mechanism, wherein the rear frame mechanism is rotatably connected to one end of a first connecting rod, the other end of the first connecting rod is rotatably connected to a second connecting rod, the outer wall of the second connecting rod is rotatably connected to a moving column, and the moving column is telescopically moved in a front-to-back direction under the drive of an external force, a connecting piece is installed on the outer wall of the front end of the moving column, and the front end of the moving column is connected to the rear wall of the screen, and the moving column drives the screen to telescopically move forward and backward.

[0007] In the above technical solution, the frame mechanism includes two first frames and two second frames, the two first frames are arranged correspondingly up and down, the two second frames are arranged correspondingly left and right, and the first frame is fixedly connected to the second frame, the frame mechanism also includes a third frame and a fourth frame parallel to the first frame, the fourth frame is arranged on the front side of the third frame, and the third frame and the fourth frame are respectively fixedly connected to the second frame, the outer walls of the third frame and the fourth frame are vertically and fixedly installed with a fifth frame, and the fifth frame is arranged parallel to the second frame;

[0008] Wherein, the first connecting rod is rotatably connected to the fourth frame in the frame mechanism at the rear side.

[0009] In the above technical solution, a driving unit is provided between the frame mechanism at the rear side and the frame mechanism at the middle side, and the driving unit drives the movable column to perform telescopic movement in the front-rear direction;

[0010] The driving unit comprises a first rotating shaft and a second rotating shaft rotatably arranged on the frame mechanism on the middle side, the first rotating shaft and the second rotating shaft are arranged in parallel, the two ends of the first rotating shaft and the second rotating shaft are rotatably connected to the third frame and the fourth frame side wall on the middle side respectively, a motor is installed on the side wall of the fourth frame on the middle side, the output end of the motor is connected to the first rotating shaft, a first pulley is fixedly installed on the outer wall of the first rotating shaft, and a second pulley is fixedly installed on the outer wall of the second rotating shaft;

[0011] The driving unit further comprises a third rotating shaft rotatably arranged on the frame mechanism at the rear side, the two ends of the third rotating shaft are rotatably connected to the third frame at the rear side and the side wall of the fourth frame respectively, and a third pulley is fixedly installed on the outer wall of the third rotating shaft;

[0012] Wherein, the outer wall engagement sleeves of the first pulley, the second pulley and the third pulley are provided with synchronous belts.

[0013] In the above technical solution, a synchronous belt pressure plate is fixedly installed on the side wall of the movable column, and the synchronous belt pressure plate is fixedly connected to the synchronous belt, and the synchronous belt drives the synchronous belt pressure plate and the movable column to move in the front-rear direction.

[0014] In the above technical solution, the left and right side walls of the moving column are provided with limiting components for limiting the moving direction of the moving column;

[0015] The limiting assembly includes a groove body respectively opened on the left and right side walls of the moving column, and also includes the second rotating shaft. The outer wall of the second rotating shaft is fixedly installed with a limiting wheel, and the limiting wheel is rotatably embedded in the inner cavity of the groove body.

[0016] In the above technical solution, two groups of the limiting components are provided, and the two groups of the limiting components are respectively arranged at the middle side and the front side of the frame mechanism.

[0017] In the above technical solution, connecting frames are fixedly installed on the side walls of the fourth frame at the rear side, the middle side and the front side.

[0018] In the above technical solution, the front end of each movable column corresponds to four screens, and every four screens form a screen unit. Two adjacent screen units are divided into two states: coplanar and front-to-back misaligned.

[0019] The screen unit in the coplanar state can display the screen information as a whole, and the screen unit in the front-to-back misaligned state can display the screen information in partitioned and front-to-back misaligned states.

[0020] In the above technical solution, support frames are vertically and fixedly installed on the first frame side walls at the front and rear sides.

[0021] Compared with the prior art, the wall matrix screen device of the utility model which can be extended forward and backward has the following beneficial effects:

[0022] First, the existing matrix screen is usually fixed on the wall and cannot be flexibly telescopically moved in the front and back directions. The flexibility of the screen information display distance is low, and it is difficult to meet the display effect of the screen at different front and back positions. The utility model drives the moving column to move in the front and back directions, which can cause the connecting member and the screen to telescopically move in the front and back directions relative to the wall, so as to flexibly adjust the position of the screen. Compared with the traditional fixed installation screen, the flexibility of the screen information display distance is increased, and the display effect of the screen at different front and back positions can be better met;

[0023] Second, the two adjacent screen units of the utility model are divided into two states: coplanar and front-to-back staggered. The screen units in the coplanar state can display the screen information as a whole, and the screen units in the front-to-back staggered state can display the screen information in partitions and front-to-back staggered. The two use states can be flexibly adjusted to meet the use requirements of different display places;

[0024] 3. The utility model can realize synchronous movement of all screen units by driving all movable columns to move synchronously in the front-back direction, so that all screen units can be coplanar and can be adjusted in the front-back direction synchronously. By adjusting two adjacent movable columns in the front or rear direction separately, two adjacent screen units can be made to achieve the effect of partition front-back misalignment.

[0025] Fourth, the utility model can promote the movement of the movable column in the front-back direction and promote the rotation of the second connecting rod and the first connecting rod through the cooperation of the motor, the first rotating shaft, the first pulley, the second rotating shaft, the second pulley, the third pulley and the synchronous belt;

[0026] 5. The utility model can limit the movement of the moving column in the front-to-back direction through the cooperation of the second rotating shaft, the limiting wheel and the groove body, so as to ensure that the moving column moves straight in the front-to-back direction, thereby ensuring that the screen can be adjusted to move straight in the front-to-back direction;

[0027] In summary, the utility model can flexibly adjust the position of the screen, which increases the flexibility of the screen information display distance compared to the traditional fixed-installed screen, and can better meet the display effects of the screen at different front and rear positions. The two adjacent screen units are divided into two states: coplanar and front-to-back staggered. The screen units in the coplanar state can display the screen information as a whole, and the screen units in the front-to-back staggered state can display the screen information in partitioned front-to-back staggered states. The two usage states can be flexibly adjusted to meet the usage requirements of different display venues. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of the screen of the utility model;

[0029] Figure 2 A bird's eye view of the first frame of the utility model;

[0030] Figure 3 for Figure 2 A magnified image of point A;

[0031] Figure 4 It is a top view of the support frame of the utility model;

[0032] Figure 5 for Figure 4 The enlarged view of point B;

[0033] Figure 6It is a rear view of the fifth frame of the utility model;

[0034] Figure 7 for Figure 6 A magnified image of point A;

[0035] Figures 1 to 7 In the embodiment, 1. the first frame, 2. the second frame, 3. the third frame, 4. the fourth frame, 5. the fifth frame, 6. the connecting frame, 7. the first connecting rod, 8. the second connecting rod, 9. the moving column, 10. the connecting piece, 11. the screen, 12. the synchronous belt pressure plate, 13. the first rotating shaft, 14. the motor, 15. the first pulley, 16. the second rotating shaft, 17. the second pulley, 18. the third rotating shaft, 19. the third pulley, 20. the synchronous belt, 21. the trough body, 22. the limiting wheel, 23. the supporting frame. DETAILED DESCRIPTION

[0036] The following is a combination of specific implementation cases and attached Figures 1 to 7 The present invention is further described below, but the present invention is not limited to these embodiments.

[0037] See also Figures 1 to 7 As shown, a wall matrix screen device that can be retracted forward and backward includes a screen 11, which is electrically connected to an existing controller. Information can be displayed through the screen 11. It is a prior art that can meet the use requirements and will not be described in detail. It also includes a frame mechanism. The frame mechanism provides support for the installation of other subsequent components. The frame mechanism is divided into a front frame mechanism, a middle frame mechanism and a rear frame mechanism. The rear frame mechanism is rotatably connected to one end of a first connecting rod 7 through a pin shaft, and the other end of the first connecting rod 7 is rotatably connected to a second connecting rod 8 through a pin shaft. The outer wall of the second connecting rod 8 is rotatably connected to a moving column 9 through a pin shaft. When the moving column 9 moves, it can cause the first connecting rod 7 to move. The angle of the rotational connection between a connecting rod 7 and a second connecting rod 8 changes, and the rear end of the movable column 9 is installed and positioned by the first connecting rod 7 and the second connecting rod 8 to ensure that a connection relationship is formed between the rear end of the movable column 9 and the frame mechanism. The movable column 9 is telescopically moved in the front and rear directions under the drive of an external force. A connecting piece 10 is installed on the outer wall of the front end of the movable column 9, and the front end of the movable column 9 is connected to the rear side wall of the screen 11. The movable column 9 drives the screen 11 to telescopically move forward and backward to realize telescopic adjustment of the screen 11 in the front and rear directions. Compared with the traditional fixed-installed screen 11, the flexibility of the screen information display distance is increased, and the display effect of the screen 11 at different front and rear positions is better met.

[0038] Specific reference Figures 1 to 3As shown, the frame mechanism includes two first frames 1 and two second frames 2, the two first frames 1 are correspondingly arranged up and down, the two second frames 2 are correspondingly arranged left and right, and the first frame 1 is fixedly connected to the second frame 2, the first frame 1 and the second frame 2 form a rectangular frame, the frame mechanism also includes a third frame 3 and a fourth frame 4 parallel to the first frame 1, the fourth frame 4 is arranged on the front side of the third frame 3, the space between the two first frames 1 is equidistantly divided by the third frame 3, and the third frame 3 and the fourth frame 4 are respectively fixedly connected to the second frame 2, with the help of the third frame 3 and the fourth frame 4, the stability between the two second frames 2 can be further achieved, the outer walls of the third frame 3 and the fourth frame 4 are vertically and fixedly installed with a fifth frame 5, and the fifth frame 5 and the second frame 2 They are arranged in parallel, and the space between the second frames 2 is equally divided by the fifth frame; wherein the first connecting rod 7 is rotatably connected to the fourth frame 4 in the rear frame mechanism through a pin shaft, and when the movable column 9 moves to the front side, it can drive the second connecting rod 8 to move, thereby prompting the first connecting rod 7 to rotate relative to the rotating connection of the fourth frame 4 as the axis, without interfering with the movement of the movable column 9, and the movable column 9 and the fourth frame 4 can be connected with the help of the first connecting rod 7 and the second connecting rod 8; in addition, connecting frames 6 are fixedly installed on the side walls of the fourth frame 4 on the rear side, middle side and front side, and the fourth frames 4 on the rear side, middle side and front side can be connected through the connecting frames 6, thereby ensuring that the fourth frames 4 on the rear side, middle side and front side are further stably connected.

[0039] Specific reference Figure 2 , Figure 3 , Figure 5 and Figure 7 As shown, a driving unit is provided between the rear frame mechanism and the middle frame mechanism, and the driving unit drives the movable column 9 to perform telescopic movement in the front-rear direction; Figure 3As shown, the driving unit includes a first rotating shaft 13 and a second rotating shaft 16 rotatably arranged on the middle side frame mechanism through bearings, the first rotating shaft 13 and the second rotating shaft 16 are arranged in parallel, and the two ends of the first rotating shaft 13 and the second rotating shaft 16 are rotatably connected to the side walls of the third frame 3 and the fourth frame 4 on the middle side through bearings, respectively, a motor 14 is installed on the side wall of the fourth frame 4 on the middle side, and the output end of the motor 14 is connected to the first rotating shaft 13, a first pulley 15 is fixedly installed on the outer wall of the first rotating shaft 13, and a second pulley 17 is fixedly installed on the outer wall of the second rotating shaft 16. When the motor 14 is turned on, it drives the first rotating shaft 13 and the first pulley 15 to rotate synchronously; the driving unit also includes The bearing is rotatably arranged on the third rotating shaft 18 of the rear frame mechanism, and the two ends of the third rotating shaft 18 are rotatably connected to the side walls of the rear third frame 3 and the fourth frame 4 respectively, and the outer wall of the third rotating shaft 18 is fixedly mounted with a third pulley 19; wherein, the outer walls of the first pulley 15, the second pulley 17 and the third pulley 19 are meshed with a synchronous belt 20, and the first rotating shaft 13 and the first pulley 15 are driven to rotate synchronously by the turned-on motor 14, so as to drive the synchronous belt 20 meshed with the outer wall of the first pulley 15 to rotate along the outer walls of the second pulley 17 and the third pulley 19, and drive the second pulley 17 and the third pulley 19 to rotate synchronously and in the same direction as the first pulley 15.

[0040] See also Figure 3 As shown, a synchronous belt pressure plate 12 is fixedly installed on the side wall of the movable column 9, and the synchronous belt pressure plate 12 is fixedly connected to the synchronous belt 20. The synchronous belt 20 drives the synchronous belt pressure plate 12 and the movable column 9 to move in the front-to-back direction. As the synchronous belt 20 moves counterclockwise, the synchronous belt pressure plate 12 is moved together, thereby driving the movable column 9 to move forward, causing the screen 11 connected to the front side of the movable column 9 to move forward together. Conversely, the clockwise movement of the synchronous belt 20 drives the synchronous belt pressure plate 12 to move together, thereby driving the movable column 9 to move backward, causing the screen 11 connected to the front side of the movable column 9 to move backward together, thereby realizing the free adjustment of the extension and retraction of the screen 11 in the front-to-back direction.

[0041] See also Figure 3 and Figure 7 As shown, in order to ensure that the movable column 9 can be stable when moving in the front-to-back direction, the left and right side walls of the movable column 9 are provided with a limiting component for limiting the moving direction of the movable column 9; the limiting component includes a groove body 21 respectively opened on the left and right side walls of the movable column 9, and also includes a second rotating shaft 16, and a limiting wheel 22 is fixedly installed on the outer wall of the second rotating shaft 16, and the limiting wheel 22 rolls in the inner cavity of the groove body 21. When the movable column 9 moves, the groove body 21 opened on the side wall of the movable column 9 moves along the outer wall of the limiting wheel 22, prompting the limiting wheel 22 to roll along the inner cavity of the groove body 21, so as to limit the movement of the movable column 9 in the front-to-back direction, thereby ensuring that the screen 11 can be adjusted to move straight in the front-to-back direction.

[0042] Specific reference Figure 7 As shown, two groups of limiting components are provided, and the two groups of limiting components are respectively provided at the middle side and the front side frame mechanism, thereby being able to further limit the side wall of the movable column 9.

[0043] Specific reference Figure 1 , Figure 2 and Figure 4 As shown, the front end of each movable column 9 corresponds to four screens 11, and every four screens 11 form a screen unit. Two adjacent screen units are divided into two states: coplanar and front-to-back offset. Among them, the screen unit in the coplanar state can display the screen information as a whole, and the screen unit in the front-to-back offset state can display the screen information in partitioned front-to-back offset. When all movable columns 9 move synchronously in the front-to-back direction, all screens 11 can move synchronously to achieve the coplanarity of all screens 11, so as to display the information as a whole. By separately adjusting the front or rear direction of two adjacent movable columns 9, the two adjacent screen units can be prompted to achieve the effect of partitioned front-to-back offset, so as to independently display the displayed screen information in partitioned offset, and the screen units composed of four adjacent screens 11 do not interfere with each other in displaying information.

[0044] See also Figure 1 and Figure 4 As shown, the side walls of the front and rear first frames 1 are vertically and fixedly installed with support frames 23, and the front and rear first frames 1 can be further connected through the support frames 23 to form a more stable connection relationship.

[0045] It is worth noting that the motor 14 in the present application adopts a forward and reverse rotating self-locking motor that can be locked at the output end commonly used on the market. When the motor stops operating, the output end can self-lock and will not rotate under external force. The output end can rotate in the forward or reverse direction and lock according to the use requirements. The above-mentioned existing components will not be described in detail here.

[0046] Matrix screen splicing is based on software splicing and uses software embedding technology to embed the splicing software into the matrix function, ultimately achieving the purpose of using the matrix to achieve the splicing effect. It is a prior art and this application does not elaborate or limit the matrix screen splicing technology. It is sufficient that it can meet the function of presenting screen information.

[0047] The working principle of a wall matrix screen device that can be extended forward and backward in this embodiment is as follows:

[0048] When the front and rear positions of the screen 11 are adjusted, the first rotating shaft 13 and the first pulley 15 are driven to rotate synchronously by the turned-on motor 14, so as to drive the synchronous belt 20 which is engaged with the outer wall of the first pulley 15 to rotate along the outer walls of the second pulley 17 and the third pulley 19, and drive the second pulley 17 and the third pulley 19 to rotate synchronously and in the same direction as the first pulley 15, and the synchronous belt pressure plate 12 is driven to move along with the movement of the synchronous belt 20, thereby driving the moving column 9 to move; the moving column 9 moves to the front side When the moving column 9 moves, the screen 11 connected to the front side of the moving column 9 moves forward together. At this time, the angle between the first connecting rod 7 and the second connecting rod 8 becomes larger under the drive of the moving column 9, and the rear end of the moving column 9 is flexibly limited. When the moving column 9 moves, the groove 21 opened on the side wall of the moving column 9 moves along the outer wall of the limiting wheel 22, so that the limiting wheel 22 rolls along the inner cavity of the groove 21, so as to limit the movement of the moving column 9 in the front-to-back direction, thereby ensuring that the screen 11 can be adjusted to move straightly in the front-to-back direction.

[0049] When all the moving columns 9 move synchronously in the front-back direction, all the screens 11 can move synchronously, so that all the screens 11 are coplanar, so that the information can be displayed as a whole; by adjusting the front or back direction of two adjacent moving columns 9 separately, the two adjacent screen units can be made to achieve the effect of partitioning and front-back misalignment, so that the display screen information can be partitioned and misaligned and independently displayed, and the display information of the screen units composed of four adjacent screens 11 does not interfere with each other;

[0050] The utility model can flexibly adjust the position of the screen 11, which increases the flexibility of the screen information display distance compared to the traditional fixed-installed screen 11, and can better meet the display effect of the screen 11 at different front and rear positions. The two adjacent screen units are divided into two states: coplanar and front-to-back staggered. The screen units in the coplanar state can display the screen information as a whole, and the screen units in the front-to-back staggered state can display the screen information in partitioned front-to-back staggered states. The two usage states can be flexibly adjusted to meet the usage requirements of different display venues.

[0051] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A wall matrix screen device that can be extended forward and backward, comprising a screen (11), characterized in that: The invention also comprises a frame mechanism, wherein the frame mechanism is divided into a front frame mechanism, a middle frame mechanism and a rear frame mechanism, wherein the rear frame mechanism is rotatably connected to one end of a first connecting rod (7), the other end of the first connecting rod (7) is rotatably connected to a second connecting rod (8), the outer wall of the second connecting rod (8) is rotatably connected to a moving column (9), and the moving column (9) is driven by an external force to telescope in the front-to-back direction, a connecting piece (10) is installed on the outer wall of the front end of the moving column (9), and the front end of the moving column (9) is connected to the rear wall of the screen (11), and the moving column (9) drives the screen (11) to telescope in the front-to-back direction.

2. The wall matrix screen device that can be extended forward and backward according to claim 1, characterized in that: The frame mechanism comprises two first frames (1) and two second frames (2), the two first frames (1) are arranged correspondingly up and down, the two second frames (2) are arranged correspondingly left and right, and the first frames (1) are fixedly connected to the second frames (2), the frame mechanism also comprises a third frame (3) and a fourth frame (4) parallel to the first frames (1), the fourth frame (4) is arranged on the front side of the third frame (3), and the third frame (3) and the fourth frame (4) are respectively fixedly connected to the second frames (2), the outer walls of the third frame (3) and the fourth frame (4) are vertically and fixedly mounted with a fifth frame (5), and the fifth frame (5) is arranged parallel to the second frame (2); Wherein, the first connecting rod (7) is rotatably connected to the fourth frame (4) in the frame mechanism at the rear side.

3. The wall matrix screen device that can be extended forward and backward according to claim 2, characterized in that: A driving unit is provided between the frame mechanism at the rear side and the frame mechanism at the middle side, and the moving column (9) is driven by the driving unit to perform telescopic movement in the front-rear direction; The driving unit comprises a first rotating shaft (13) and a second rotating shaft (16) which are rotatably arranged on the frame mechanism at the middle side, the first rotating shaft (13) and the second rotating shaft (16) are arranged in parallel, the two ends of the first rotating shaft (13) and the second rotating shaft (16) are respectively rotatably connected to the side walls of the third frame (3) and the fourth frame (4) at the middle side, a motor (14) is installed on the side wall of the fourth frame (4) at the middle side, the output end of the motor (14) is connected to the first rotating shaft (13), a first pulley (15) is fixedly installed on the outer wall of the first rotating shaft (13), and a second pulley (17) is fixedly installed on the outer wall of the second rotating shaft (16); The driving unit further comprises a third rotating shaft (18) rotatably arranged on the frame mechanism at the rear side, the two ends of the third rotating shaft (18) being rotatably connected to the side walls of the third frame (3) and the fourth frame (4) at the rear side respectively, and a third pulley (19) being fixedly mounted on the outer wall of the third rotating shaft (18); Wherein, the outer wall engagement sleeves of the first pulley (15), the second pulley (17) and the third pulley (19) are provided with a synchronous belt (20).

4. The wall matrix screen device that can be extended forward and backward according to claim 3, characterized in that: A synchronous belt pressure plate (12) is fixedly installed on the side wall of the movable column (9), and the synchronous belt pressure plate (12) is fixedly connected to the synchronous belt (20). The synchronous belt (20) drives the synchronous belt pressure plate (12) and the movable column (9) to move in the front-rear direction.

5. The wall matrix screen device that can be extended forward and backward according to claim 4, characterized in that: The left and right side walls of the movable column (9) are provided with limiting components for limiting the moving direction of the movable column (9); The limiting assembly comprises a groove body (21) respectively opened on the left and right side walls of the movable column (9), and also comprises the second rotating shaft (16), and a limiting wheel (22) is fixedly installed on the outer wall of the second rotating shaft (16), and the limiting wheel (22) is rotatably embedded in the inner cavity of the groove body (21).

6. The wall matrix screen device that can be extended forward and backward according to claim 5, characterized in that: The position limiting components are provided in two groups, and the two groups of the position limiting components are respectively arranged at the middle side and the front side of the frame mechanism.

7. The wall matrix screen device that can be extended forward and backward according to claim 2, characterized in that: Connecting frames (6) are fixedly mounted on the side walls of the fourth frame (4) at the rear side, the middle side and the front side.

8. The wall matrix screen device that can be extended forward and backward according to claim 1, characterized in that: The front end of each movable column (9) corresponds to four screens (11), and each four screens (11) form a screen unit, and two adjacent screen units are divided into two states: coplanar and front-to-back misaligned; The screen unit in the coplanar state can display the screen information as a whole, and the screen unit in the front-to-back misaligned state can display the screen information in partitioned and front-to-back misaligned states.

9. The wall matrix screen device that can be extended forward and backward according to claim 2, characterized in that: Support frames (23) are vertically and fixedly mounted on the side walls of the first frame (1) at the front and rear sides.

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