White board all-in-one machine and writing board all-in-one device

Abstract

The utility model is suitable for the technical field of digital equipment, and provides a white board all-in-one machine and writing board integrated device, which comprises a white board all-in-one machine, a writing board and a display screen, the writing board is provided with a connecting assembly. The connecting assembly is provided with a mounting plate, a connecting frame and a sliding assembly, the mounting plate is mounted on the whiteboard all-in-one machine, the connecting frame is mounted on the writing board, and the mounting plate is slidably connected with the connecting frame so as to adjust the position of the writing board; the sliding assembly is provided with a plurality of first sliding blocks, a plurality of second sliding blocks and a connecting plate, the first sliding blocks are installed on the installing plate side by side and connected with the back face of the connecting plate, and the second sliding blocks are installed on the front face of the connecting plate side by side and connected with the connecting frame. The white board all-in-one machine and the writing board are connected in a sliding mode through the sliding assembly, the writing board can be stored in the front face of the white board all-in-one machine conveniently, and the problems that when the white board all-in-one machine is not used, large space is occupied, space utilization is not facilitated, and storage is not convenient are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of digital equipment, and in particular relates to an integrated device of a whiteboard machine and a writing board. Background Art

[0002] The application areas of educational equipment are very broad, covering all stages from kindergarten to higher education, and various forms of education including vocational training. They are mainly used in preschool education, basic education, higher education, vocational training, distance education, special education and other fields.

[0003] Educational equipment primarily includes interactive whiteboards, teaching projectors, electronic courseware production and playback equipment, and virtual laboratory equipment. Interactive whiteboards are multifunctional teaching devices that integrate electronic whiteboards, computers, projectors, and audio systems. They enable interaction and information sharing between teachers and students. In class, teachers can project courseware onto the electronic whiteboard, helping them create, edit, and play multimedia teaching materials, improving teaching effectiveness.

[0004] In the prior art, most interactive whiteboards are equipped with multiple display screens spliced ​​together to expand the screen range according to the needs of classroom presentations. However, when multiple groups of screens are used in conjunction, they occupy a large space and the occupied area cannot be reduced. When not in use, they occupy a large space, which is not conducive to space utilization and is not convenient for storage. Utility Model Content

[0005] The purpose of the embodiment of the utility model is to provide an integrated whiteboard and writing board device, aiming to solve the problem that when multiple sets of screens are used in conjunction, they occupy a large space and the occupied area cannot be reduced. When not in use, they occupy a large space, which is not conducive to space utilization and inconvenient to store.

[0006] The embodiment of the present invention is implemented as follows: a whiteboard all-in-one device and a writing board integrated device, the whiteboard all-in-one device and the writing board integrated device comprising:

[0007] Whiteboard all-in-one machine;

[0008] The writing board is provided with a connecting component, and the connecting component is used to connect the whiteboard all-in-one machine and the writing board;

[0009] A connecting assembly is provided with a mounting plate, a connecting frame, and a sliding assembly. The mounting plate is mounted on the all-in-one whiteboard machine, and the connecting frame is mounted on the writing board. The mounting plate is slidably connected to the connecting frame via the sliding assembly to facilitate adjustment of the position of the writing board. The mounting plate is provided with a first slide groove.

[0010] A sliding assembly comprises multiple groups of first sliders, multiple groups of second sliders and a connecting plate. Multiple groups of first sliders are mounted side by side on the first sliding grooves of the mounting plate and are slidingly connected to the connecting plate. Multiple groups of second sliders are mounted side by side on the second sliding grooves on the front of the connecting plate and are slidingly connected to the connecting frame.

[0011] Preferably, the all-in-one whiteboard machine is provided with a mounting frame and a projection assembly. The mounting frame is arranged in an L-shape, one end of the mounting frame is mounted on the back of the all-in-one whiteboard machine, and the other end is used to be mounted on the projection assembly. A control assembly is provided on the back of the all-in-one whiteboard machine, and the control assembly is used to control the information displayed on the writing board.

[0012] Preferably, the writing board is electrically connected to the all-in-one whiteboard so that the all-in-one whiteboard can control the information displayed on the writing board. The writing board is provided with a first connecting component installed on the top of the writing board and a second connecting component installed on the bottom of the writing board.

[0013] Preferably, the mounting plate is a rectangular plate structure, and a first slide groove is set on the front of the mounting plate, the first slide groove is used to install multiple groups of first sliders and connecting plates, and a third slide groove and a fourth slide groove are set on the two opposite groove walls of the first slide groove, and the third slide groove and the fourth slide groove are used to position the first slider.

[0014] Preferably, the connecting frame is provided with a connecting part and an installing part, the connecting part is a rectangular plate structure, and the connecting part is slidably connected to the connecting plate through a second slider; the installing part is provided with multiple support seats, one end of the support seat is installed on the back of the connecting part, and the other end is installed on the writing board.

[0015] Preferably, the connecting plate is a rectangular plate structure, and a second slide groove is provided on the front of the connecting plate, the second slide groove is used to install multiple groups of second sliders and a connecting frame, and a fifth slide groove and a sixth slide groove are provided on the two opposite groove walls of the second slide groove, and the fifth slide groove and the sixth slide groove are used to position the second slider; the back of the connecting plate is connected to multiple groups of first sliders to facilitate the installation of the connecting plate on the mounting plate.

[0016] Preferably, the upper end surface of the first slider is slidably connected to the first slide groove via a first ball, and the first ball is embedded in the third slide groove; the lower bottom surface of the first slider is slidably connected to the first slide groove via a second ball, and the second ball is embedded in the fourth slide groove, and two adjacent groups of first sliders are connected by a first connecting rod, and a first limiting groove is provided on the first connecting rod, and the first limiting groove is used to limit the sliding stroke between the two adjacent groups of first sliders;

[0017] A first positioning block is provided on the back of the first slider, and the first positioning block cooperates with the first limiting groove on the first connecting rod to connect the first slider to the first connecting rod. In each two adjacent groups of first sliders, one end of the first connecting rod cooperates with the first positioning block on the back of the first group of first sliders through the first limiting groove, and the other end of the first connecting rod is installed on the back of the second group of first sliders.

[0018] Preferably, the upper end surface of the second slider is slidably connected to the second slide groove via a third ball, and the third ball is embedded in the fifth slide groove; the lower bottom surface of the second slider is slidably connected to the second slide groove via a fourth ball, and the fourth ball is embedded in the sixth slide groove, and two adjacent groups of second sliders are connected by a second connecting rod, and a second limiting groove is provided on the second connecting rod, and the second limiting groove is used to limit the sliding stroke between the two adjacent groups of second sliders;

[0019] A second positioning block is provided on the back of the second slider, and the second positioning block cooperates with the second limiting groove on the second connecting rod to connect the second slider to the second connecting rod. One end of the second connecting rod in each adjacent two groups of second sliders cooperates with the second positioning block on the back of the first group of second sliders through the second limiting groove, and the other end of the second connecting rod is installed on the back of the second group of second sliders.

[0020] The embodiment of the present invention provides an integrated device of a whiteboard and a writing board. The present invention provides a connecting component installed on the whiteboard and the writing board, and a sliding component is used to make the whiteboard and the writing board slidingly connected. A plurality of groups of first sliders and a plurality of groups of second sliders are respectively installed side by side on the main screen main board and the writing board through the connecting plate, so that the whiteboard and the writing board are slidably connected so that the writing board can be stored on the front of the whiteboard, which is convenient for storage and reduces the space occupied by the writing board after storage, which is beneficial to space utilization and solves the problems of occupying a large area of ​​space when not in use, being unfavorable for space utilization, and being inconvenient for storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional structural diagram of an integrated whiteboard and writing board device provided in an embodiment of the present invention;

[0022] Figure 2 This is a structural schematic diagram of a whiteboard and writing board integrated device in a stored state provided by an embodiment of the present invention;

[0023] Figure 3 A schematic structural diagram of a connecting assembly in an integrated whiteboard and writing board device provided by an embodiment of the present invention in an expanded state;

[0024] Figure 4 This is a schematic diagram of the back structure of a whiteboard and writing board integrated device in an expanded state provided by an embodiment of the present invention;

[0025] Figure 5 A schematic structural diagram of a first slider of a sliding assembly in a whiteboard and writing board integrated device provided by an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of the structure of a whiteboard and writing board integrated device in a stored state of a connecting component provided by an embodiment of the present invention;

[0027] Figure 7 This is a structural schematic diagram of the second slider in the storage state of the connecting component in an integrated whiteboard and writing board device provided by an embodiment of the present invention.

[0028] In the accompanying drawings: 1. Whiteboard all-in-one machine; 11. Mounting frame; 2. Writing board; 3. Mounting plate; 31. First slide groove; 4. Connecting frame; 41. Support seat; 5. Sliding assembly; 51. First slider; 511. First connecting rod; 512. First ball bearing; 513. Second ball bearing; 514. First positioning block; 52. Second slider; 53. Connecting plate; 531. Second slide groove. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0031] like Figure 1-7 FIG. 1 is a structural diagram of a whiteboard and writing board integrated device provided by an embodiment of the present invention, comprising:

[0032] Whiteboard all-in-one machine 1;

[0033] The writing board 2 is provided with a connecting component, and the connecting component is used to connect the whiteboard all-in-one machine 1 and the writing board 2;

[0034] The connecting assembly includes a mounting plate 3, a connecting frame 4, and a sliding assembly 5. The mounting plate 3 is mounted on the all-in-one whiteboard 1, and the connecting frame 4 is mounted on the writing board 2. The mounting plate 3 is slidably connected to the connecting frame 4 via the sliding assembly 5 to facilitate adjustment of the position of the writing board 2. The mounting plate 3 is provided with a first slide groove 31.

[0035] The sliding assembly 5 comprises multiple groups of first sliders 51, multiple groups of second sliders 52 and a connecting plate 53. The multiple groups of first sliders 51 are mounted side by side on the first slide groove 31 of the mounting plate 3 and are slidably connected to the connecting plate 53. The multiple groups of second sliders 52 are mounted side by side on the second slide groove 531 on the front of the connecting plate 53 and are slidably connected to the connecting frame 4.

[0036] In the embodiment of the present invention, preferably, the integrated whiteboard machine and writing board device can be used in classrooms or laboratories as educational digital equipment, and information screens are displayed through the whiteboard machine 1 and the writing board 2. The writing board 2 can be set into one group or multiple groups according to actual needs, and the writing board 2 is connected to the whiteboard machine 1 by using a connecting component, and the position of the writing board 2 can be adjusted by sliding the sliding component 5. It is not only convenient to clearly display the information on the video screen, but also the writing board 2 can be stored by sliding, reducing the space occupied in the classroom or laboratory. When the writing board 2 needs to be unfolded for use, the writing board 2 is pulled toward the outside of the whiteboard machine 1, so that the first slider 51 installed side by side on the first slide groove 31 moves outward. When multiple groups of second sliders 51 are pulled outward, the first slider 51 installed side by side on the first slide groove 31 moves outward. When one slider 51 moves to the end of the first slide groove 31, the second slider 52 installed on the second slide groove 531 moves outward and multiple groups of second sliders 52 move to the end of the second slide groove 531; when the writing board 2 needs to be stored, the writing board 2 is pulled toward the inside of the whiteboard all-in-one 1, so that the second sliders 52 installed side by side on the second slide groove 531 slide inward and are arranged side by side on the connecting frame 4. When multiple groups of second sliders 52 move to the end, the connecting plate 53 connected to the connecting frame 4 will drive the first slider 51 on the mounting plate 3 to slide inward, so that the sliding assembly 5 is installed on the mounting plate 3 and overlaps. The writing board 2 is also driven by the sliding assembly 5 and is located in front of the whiteboard all-in-one 1. After the writing board 2 is completely stored, the horizontal space occupied and the floor area of ​​the entire projection device are reduced.

[0037] In one example of the present invention, the present invention provides a connecting component installed on the whiteboard all-in-one machine and the writing board 2, and the sliding component 5 makes the whiteboard all-in-one machine and the writing board 2 slidingly connected, and multiple groups of first sliders 51 and multiple groups of second sliders 52 are respectively installed side by side on the main screen main board and the writing board 2 through the connecting plate 53, so that the whiteboard all-in-one machine 1 and the writing board 2 are slidably connected so that the writing board 2 can be stored on the front of the whiteboard all-in-one machine 1, which is convenient for storage and reduces the space occupied by the writing board 2 after storage, which is beneficial to space utilization, and solves the problem of occupying a large area of ​​space when not in use, which is not conducive to space utilization and inconvenient for storage.

[0038] like Figure 1-7 As shown, as a preferred embodiment of the present invention, the whiteboard all-in-one machine 1 is provided with a mounting bracket 11 and a projection assembly. The mounting bracket 11 is arranged in an L-shape, one end of the mounting bracket 11 is mounted on the back of the whiteboard all-in-one machine 1, and the other end is used to be mounted on the projection assembly. A control assembly is provided on the back of the whiteboard all-in-one machine 1, and the control assembly is used to control the information displayed on the writing board 2.

[0039] In an embodiment of the present invention, preferably, a mounting bracket 11 and a projection component can be provided in the whiteboard all-in-one machine 1. The mounting bracket 11 is installed on the back of the whiteboard all-in-one machine 1 and can be set to an L-shape so that the projection component installed on the mounting bracket 11 can project the required projected picture content onto the whiteboard all-in-one machine 1 and the writing board 2. The control component provided on the whiteboard all-in-one machine 1 is used to control the picture content projected on the whiteboard all-in-one machine 1 and the information displayed on the writing board 2. The control component can also be provided with an interface to connect the projection device body to an external power supply so as to receive and display external signals.

[0040] like Figure 1-7 As shown, as a preferred embodiment of the present invention, the writing board 2 is electrically connected to the whiteboard all-in-one machine 1 so that the whiteboard all-in-one machine 1 controls the information displayed on the writing board 2, and the writing board 2 is provided with a first connecting component installed on the top of the writing board 2 and a second connecting component installed on the bottom of the writing board 2.

[0041] In an embodiment of the present invention, preferably, the writing board 2 can be connected to the control component on the back of the whiteboard all-in-one machine 1 by setting wires or cables so that the whiteboard all-in-one machine 1 can control the information content displayed on the writing board 2. A first connecting component can be provided on the writing board 2 body, which is installed on the top of the writing board 2 and connected to the top of the whiteboard all-in-one machine 1, and a second connecting component is installed on the bottom of the writing board 2 and connected to the bottom of the whiteboard all-in-one machine 1. This can strengthen the connection between the writing board 2 and the whiteboard all-in-one machine 1 and facilitate sliding the writing board 2.

[0042] like Figure 1-7 As shown, as a preferred embodiment of the present invention, the mounting plate 3 is a rectangular plate structure, and a first slide groove 31 is provided on the front of the mounting plate 3. The first slide groove 31 is used to install multiple groups of first sliders 51 and connecting plates 53. A third slide groove and a fourth slide groove are provided on the two opposite groove walls of the first slide groove 31. The third slide groove and the fourth slide groove are used to position the first slider 51.

[0043] In an embodiment of the present invention, preferably, the mounting plate 3 can be set to be a rectangular plate with a U-shape and a certain length, the first slide groove 31 is a U-shaped groove, and the third slide groove and the fourth slide groove can be rectangular grooves arranged on the two opposite groove walls of the U-shaped groove.

[0044] like Figure 1-7 As shown, as a preferred embodiment of the present invention, the connecting frame 4 is provided with a connecting portion and a mounting portion, the connecting portion is a rectangular plate structure, and the connecting portion is slidingly connected to the connecting plate 53 through a second slider 52; the mounting portion is provided with a plurality of support seats 41, one end of the support seat 41 is installed on the back of the connecting portion, and the other end is installed on the writing board 2.

[0045] In an embodiment of the present utility model, preferably, the connecting frame 4 can be a frame with a certain height and is composed of a plate-shaped connecting portion and an installation portion of multiple support seats 41. The multiple support seats 41 are arranged side by side and installed on the back of the connecting portion.

[0046] As Figure 1-7 shown, as a preferred embodiment of the present utility model, the connecting plate 53 is a rectangular plate-shaped structure. A second chute 531 is provided on the front surface of the connecting plate 53. The second chute 531 is used for installing multiple groups of second sliders 52 and the connecting frame 4. Fifth chutes and sixth chutes are provided on two opposite groove wall surfaces of the second chute 531. The fifth chutes and the sixth chutes are used for positioning the second sliders 52; the back surface of the connecting plate 53 is connected to multiple groups of first sliders 51 to facilitate the installation of the connecting plate 53 on the mounting plate 3.

[0047] In an embodiment of the present utility model, preferably, the connecting plate 53 can be set to a U-shaped and rectangular plate with a certain length. The width of the connecting plate 53 is not greater than the groove width of the first chute 31 on the mounting plate 3 to facilitate the installation of the connecting plate 53 on the mounting plate 3 through multiple groups of first sliders 51. The second chute 531 on the connecting plate 53 can be U-shaped, and the fifth chutes and the sixth chutes provided on two opposite groove wall surfaces of the U-shaped second chute 531 can be rectangular grooves to facilitate the installation of the second sliders 52.

[0048] As Figure 1-7 shown, as a preferred embodiment of the present utility model, the upper end surface of the first slider 51 is slidably connected to the first chute 31 through the first ball 512, and the first ball 512 is embedded in the third chute; the lower bottom surface of the first slider 51 is slidably connected to the first chute 31 through the second ball 513, and the second ball 513 is embedded in the fourth chute. The adjacent two groups of first sliders 51 are provided with a first connecting rod 511 to connect them. A first limiting groove is provided on the first connecting rod 511. The first limiting groove is used to limit the sliding stroke between the adjacent two groups of first sliders 51; a first positioning block 514 is provided on the back surface of the first slider 51. The first positioning block 514 cooperates with the first limiting groove on the first connecting rod 511 to connect the first slider 51 and the first connecting rod 511. One end of the first connecting rod 511 in each adjacent two groups of first sliders 51 cooperates with the first positioning block 514 on the back surface of the first group of first sliders 51 through the first limiting groove, and the other end of the first connecting rod 511 is installed on the back surface of the second group of first sliders 51.

[0049] In the embodiment of the present utility model, preferably, the first slider 51 can be a rectangular plate with a certain thickness, and the first ball 512 and the second ball 513 are respectively provided on the upper and lower bottom surfaces of the first slider 51, and the first ball 512 is embedded in the third slide groove on the first slide groove 31, and the second ball 513 is embedded in the fourth slide groove. The first ball 512 and the second ball 513 roll on the slide groove respectively to guide the first slider 51 to move along the length direction of the first slide groove 31. The first positioning block 514 with a certain thickness is provided on the back of the first slider 51. The cylindrical protrusion, the first positioning block 514 cooperates with the first limiting groove on the first connecting rod 511 to limit the spacing between two adjacent groups of first sliders 51. The first connecting rod 511 is a rod-shaped rod with a certain length and one end is connected to the first positioning block 514 on the back of one group of first sliders 51 through the first limiting groove, and the other end is fixed to the back of the other group of first sliders 51. The installation direction of multiple groups of first connecting rods 511 is the same and the direction of side-by-side installation of multiple groups of first sliders 51 is the same so that multiple groups of first sliders 51 can slide together in the same direction at the same time.

[0050] like Figure 1-7 As shown, as a preferred embodiment of the present invention, the upper end surface of the second slider 52 is slidably connected to the second slide groove 531 through a third ball, and the third ball is embedded in the fifth slide groove; the lower bottom surface of the second slider 52 is slidably connected to the second slide groove 531 through a fourth ball, and the fourth ball is embedded in the sixth slide groove, and the two adjacent groups of second sliders 52 are provided with a second connecting rod for connection, and a second limiting groove is provided on the second connecting rod, and the second limiting groove is used to limit the sliding stroke between the two adjacent groups of second sliders 52; a second positioning block is provided on the back of the second slider 52, and the second positioning block cooperates with the second limiting groove on the second connecting rod to connect the second slider 52 to the second connecting rod, and one end of the second connecting rod in each two adjacent groups of second sliders 52 cooperates with the second positioning block on the back of the first group of second sliders 52 through the second limiting groove, and the other end of the second connecting rod is installed on the back of the second group of second sliders 52.

[0051] In the embodiment of the present invention, preferably, the explanation of the second slider 52 and the second connecting rod can refer to the explanation of the first slider 51 and the first connecting rod 511, and the embodiment of the present invention will not be repeated.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device integrating a whiteboard and a writing board, characterized in that: The integrated whiteboard and writing board device comprises: Whiteboard all-in-one machine; The writing board is provided with a connecting component, and the connecting component is used to connect the whiteboard all-in-one machine and the writing board; A connecting assembly is provided with a mounting plate, a connecting frame, and a sliding assembly. The mounting plate is mounted on the all-in-one whiteboard machine, and the connecting frame is mounted on the writing board. The mounting plate is slidably connected to the connecting frame via the sliding assembly to facilitate adjustment of the position of the writing board. The mounting plate is provided with a first slide groove. A sliding assembly comprises a plurality of first sliding blocks, a plurality of second sliding blocks and a connecting plate, wherein the plurality of first sliding blocks are mounted side by side on the first sliding grooves of the mounting plate and are slidably connected to the connecting plate; and the plurality of second sliding blocks are mounted side by side on the second sliding grooves on the front of the connecting plate and are slidably connected to the connecting frame. The mounting plate is a rectangular plate structure, and a first slide groove is provided on the front of the mounting plate, and the first slide groove is used to install multiple sets of first sliders and the connecting plate. A third slide groove and a fourth slide groove are provided on two groove walls opposite to the first slide groove, and the third slide groove and the fourth slide groove are used to position the first slider; The upper end surface of the first slider is slidably connected to the first slide groove through a first ball, and the first ball is embedded in the third slide groove; the lower bottom surface of the first slider is slidably connected to the first slide groove through a second ball, and the second ball is embedded in the fourth slide groove. Two adjacent groups of first sliders are connected by a first connecting rod, and a first limiting groove is provided on the first connecting rod. The first limiting groove is used to limit the sliding stroke between the two adjacent groups of first sliders; A first positioning block is provided on the back of the first slider, and the first positioning block cooperates with the first limiting groove on the first connecting rod to connect the first slider to the first connecting rod. In each two adjacent groups of first sliders, one end of the first connecting rod cooperates with the first positioning block on the back of the first group of first sliders through the first limiting groove, and the other end of the first connecting rod is installed on the back of the second group of first sliders.

2. The integrated whiteboard and writing board device according to claim 1, characterized in that: The all-in-one whiteboard machine is provided with a mounting frame and a projection assembly. The mounting frame is arranged in an L shape, one end of the mounting frame is mounted on the back of the all-in-one whiteboard machine, and the other end is used to be mounted on the projection assembly. A control assembly is provided on the back of the all-in-one whiteboard machine, and the control assembly is used to control the information displayed on the writing board.

3. The integrated whiteboard and writing board device according to claim 2, characterized in that: The writing board is electrically connected to the all-in-one whiteboard so that the all-in-one whiteboard can control the information displayed on the writing board. The writing board is provided with a first connecting component installed on the top of the writing board and a second connecting component installed on the bottom of the writing board.

4. The integrated whiteboard and writing board device according to claim 1, characterized in that: The connecting frame is provided with a connecting part and a mounting part. The connecting part is a rectangular plate structure and is slidably connected to the connecting plate through a second slider. The mounting part is provided with multiple support seats, one end of the support seat is installed on the back of the connecting part and the other end is installed on the writing board.

5. The integrated whiteboard and writing board device according to claim 1, characterized in that: The connecting plate is a rectangular plate structure, and a second slide groove is provided on the front of the connecting plate, and the second slide groove is used to install multiple groups of second sliders and a connecting frame. A fifth slide groove and a sixth slide groove are provided on the two opposite groove walls of the second slide groove, and the fifth slide groove and the sixth slide groove are used to position the second slider; the back of the connecting plate is connected to multiple groups of first sliders to facilitate the installation of the connecting plate on the mounting plate.

6. The integrated whiteboard and writing board device according to claim 5, characterized in that: The upper end surface of the second slider is slidably connected to the second slide groove through a third ball, and the third ball is embedded in the fifth slide groove; the lower bottom surface of the second slider is slidably connected to the second slide groove through a fourth ball, and the fourth ball is embedded in the sixth slide groove. Two adjacent groups of second sliders are connected by a second connecting rod, and a second limiting groove is provided on the second connecting rod. The second limiting groove is used to limit the sliding stroke between the two adjacent groups of second sliders; A second positioning block is provided on the back of the second slider, and the second positioning block cooperates with the second limiting groove on the second connecting rod to connect the second slider to the second connecting rod. One end of the second connecting rod in each adjacent two groups of second sliders cooperates with the second positioning block on the back of the first group of second sliders through the second limiting groove, and the other end of the second connecting rod is installed on the back of the second group of second sliders.

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