Secondary screen device and smart blackboard

Abstract

The present application provides a secondary screen device and a smart blackboard. The secondary screen device provided by the present application is used to connect with the main screen device of the smart blackboard. The secondary screen device includes a secondary screen and a frame assembly. The frame assembly includes at least two frame members. The at least two frame members are assembled and enclosed to form a hollow frame. At least one of the two frame members has a side frame extending along its own direction. One of the side frame and the secondary screen has a protrusion, and the other has a groove. The extension direction of the protrusion and the groove is consistent with the extension direction of the side of the secondary screen. The protrusion is engaged with the groove to limit the relative position of the frame member and the secondary screen in the thickness direction of the secondary screen. The overall structure of the secondary screen device of the present application is relatively simple and the cost is low.

Description

Technical Field

[0001] The present application relates to the technical field of display screens, and in particular to a secondary screen device and a smart blackboard. Background Art

[0002] The smart blackboard uses capacitive touch technology to combine traditional handwriting blackboards and multimedia devices, making it easy to switch between chalk writing and multimedia applications. The same area can be used for normal writing with chalk like an ordinary blackboard, or for touch with hands to watch a variety of rich multimedia applications such as PPT, videos, pictures, animations, etc.

[0003] Existing smart blackboards generally include a main screen device and a sub-screen device spliced ​​to the side of the main screen device, wherein the sub-screen device is composed of a frame assembly, a wall mount, a sub-screen and a main-sub-screen splicing adapter, wherein the frame assembly includes an upper frame, a lower frame, a left frame, a right frame, a corner connected between adjacent frames and an upper frame adapter, the upper frame, the lower frame, the left frame and the right frame form a frame for accommodating the sub-screen, and the upper frame, the lower frame, the left frame and the right frame are respectively fastened to the sub-screen by screws, and the sub-screen is made of an aluminum honeycomb composite panel.

[0004] Therefore, the overall structure of the existing secondary screen device is relatively complex, uses more materials, and has a high cost. Summary of the invention

[0005] The present application provides a secondary screen device and a smart blackboard, which have a relatively simple overall structure and low cost.

[0006] On the one hand, the present application provides a secondary screen device for connecting to a main screen device of a smart blackboard, the secondary screen device comprising a secondary screen and a frame assembly, the frame assembly comprising at least two frame members, at least two frame members being assembled together to enclose a hollow frame, at least one of the two frame members having a side frame extending along its own direction, one of the side frame and the secondary screen having a protrusion, and the other having a groove, the extension directions of the protrusion and the groove being consistent with the extension direction of the side edge of the secondary screen, the protrusion being engaged with the groove to limit the relative position of the frame member and the secondary screen in the thickness direction of the secondary screen.

[0007] Optionally, in the secondary screen device provided in the present application, at least two frame members include a first frame member and a second frame member, the first frame member and the second frame member are respectively arranged on different sides of the secondary screen, and the first frame member is arranged on at least two adjacent sides of the secondary screen.

[0008] Optionally, in the secondary screen device provided in the present application, the first frame member is arranged on three adjacent sides of the secondary screen.

[0009] Optionally, in the secondary screen device provided in the present application, the first frame member includes a first frame and a second frame, the first frame abuts against the side of the secondary screen extending along its height direction; there are two second frames, and the two second frames are respectively connected to the two side edges of the secondary screen extending along its length direction; the second frame is provided with a protrusion, which is located on the side of the second frame facing the secondary screen, and the protrusion is engaged with the groove to limit the relative position of the first frame member and the secondary screen in the thickness direction of the secondary screen.

[0010] Optionally, in the secondary screen device provided in the present application, the second frame member is arranged opposite to the first frame, the frame assembly also includes a first fastener, and the second frame member and the side of the secondary screen are detachably connected through the first fastener.

[0011] Optionally, in the secondary screen device provided in the present application, the frame assembly also includes two adapters, which are respectively arranged on the two end parts of the second frame member along its own extension direction; the adapter includes an adapter body and an extension part, the first end of the adapter body is connected to the second frame member, the extension part is connected to the second end of the adapter body, and the extension direction of the extension part is consistent with the thickness direction of the secondary screen; the second frame is provided with a slot, the slot has two slot walls arranged opposite to each other, the two slot walls are arranged at intervals in the side extension direction of the secondary screen, and the extension part is located in the slot and abuts against the slot wall to limit the relative position of the first frame member and the secondary screen in the length direction of the secondary screen.

[0012] Optionally, in the secondary screen device provided in the present application, the frame assembly also includes a limit member, the extension direction of the limit member is consistent with the height direction of the secondary screen, the limit member is arranged corresponding to the second frame, and the limit member is used to connect the second frame and the secondary screen to limit the relative position of the first frame member and the secondary screen in the height direction of the secondary screen.

[0013] Optionally, in the secondary screen device provided in the present application, the secondary screen includes a foaming layer, a welding layer and a writing layer stacked in sequence, and the writing layer is located on the front side of the secondary screen device.

[0014] Optionally, the secondary screen device provided in the present application further includes at least one connecting accessory and a second fastener, and the connecting accessory is connected to the secondary screen or frame assembly through the second fastener; the connecting accessory includes at least one of the following: a connecting frame, a baffle, and a splicing frame.

[0015] On the other hand, the present application provides a smart blackboard, including a main screen device and the above-mentioned secondary screen device.

[0016] The present application provides a secondary screen device and a smart blackboard. The secondary screen device provided by the present application is used to connect with the main screen device of the smart blackboard. The secondary screen device includes a secondary screen and a frame assembly. The frame assembly includes at least two frame members. The at least two frame members are assembled and enclosed to form a hollow frame. At least one of the two frame members has a side frame extending along its own direction. One of the side frame and the secondary screen has a protrusion, and the other has a groove. The extension direction of the protrusion and the groove is consistent with the extension direction of the side of the secondary screen. The protrusion is engaged with the groove to limit the relative position of the frame member and the secondary screen in the thickness direction of the secondary screen. Therefore, the overall structure of the secondary screen device provided by the present application is relatively simple and the cost is low.

[0017] The structure of the present application and its other application objects and beneficial effects will be more clearly understood through the description of the preferred embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1a It is a structural schematic diagram of a secondary screen device;

[0020] Figure 1b for Figure 1a A schematic diagram of the partial structure of the secondary screen device;

[0021] Figure 2a A schematic diagram of the three-dimensional structure of the secondary screen device provided in an embodiment of the present application;

[0022] Figure 2b An exploded view of a secondary screen device provided in an embodiment of the present application;

[0023] Figure 2c A schematic diagram of the three-dimensional structure of a secondary screen in the secondary screen device provided in an embodiment of the present application;

[0024] Figure 2d for Figure 2c A schematic diagram of the enlarged local structure at point A in the middle;

[0025] Figure 3a A cross-sectional schematic diagram of the connection state between the secondary screen and the first frame member in the secondary screen device provided in an embodiment of the present application;

[0026] Figure 3b for Figure 3a A magnified schematic diagram of the local structure at B in the middle;

[0027] Figure 4a A schematic diagram of the planar structure of the secondary screen device provided in an embodiment of the present application;

[0028] Figure 4b for Figure 4a A magnified schematic diagram of the local structure at C in the middle;

[0029] Figure 5a A schematic diagram of the front structure of a frame assembly in a secondary screen device provided in an embodiment of the present application;

[0030] Figure 5b for Figure 5a A magnified schematic diagram of the local structure at D in the middle;

[0031] Figure 5c A schematic diagram of the three-dimensional structure of the adapter in the secondary screen device provided in an embodiment of the present application;

[0032] Figure 6 for Figure 2a A magnified schematic diagram of the local structure at E in the middle;

[0033] Figure 7 A schematic diagram of the structure of a secondary screen in a secondary screen device provided in an embodiment of the present application;

[0034] Figure 8a for Figure 2a A magnified schematic diagram of the local structure at F in the middle;

[0035] Figure 8b for Figure 2a A magnified schematic diagram of the local structure at G in the middle;

[0036] Figure 9a A diagram showing the connection status of a secondary screen and a first frame member in a secondary screen device provided in an embodiment of the present application;

[0037] Figure 9b for Figure 9a A magnified schematic diagram of the local structure at H in the middle;

[0038] Fig.10a A schematic diagram of the structure of the smart blackboard provided in the embodiment of the present application;

[0039] Fig.10b for Fig.10a A magnified schematic diagram of the local structure at point I in the middle.

[0040] Description of reference numerals:

[0041] 1. 30-secondary screen; 11-foaming layer; 12-welding layer; 13-writing layer; 14-zinc plate layer; 2. 10-frame assembly; 21-frame member; 21a-first frame member; 211-side frame; 2111-limiting hole; 212-first frame; 213-second frame; 2131-slot; 21311-slot wall; 21b-second frame member; 22-adapter; 221-adapter body; 2211-first connecting arm; 2212-second connecting arm; 222-extension portion; 223-positioning portion; 3-protruding portion; 4-groove; 5-hanging piece; 6-connecting accessories; 61-connecting frame; 62-wall adapter; 63-baffle; 64-splicing frame; 641-raised part; 642-connecting part; 100, 300-secondary screen device; 200-main screen device; 400-main and secondary screen splicing parts; 401-fixing part; 402-plug-in part; 101-upper frame; 102-lower frame; 103-left frame; 104-right frame; 105-corner; 106-upper frame adapter; 20-wall mounting; 40-main and secondary screen splicing adapter; 50-screws. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0043] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] It should be noted that in the description of this application, the terms "first" and "second" are only used to facilitate the description of different components, and cannot be understood as indicating or implying a sequential relationship, relative importance, or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0047] The smart blackboard uses capacitive touch technology to combine traditional handwriting blackboards and multimedia devices, making it easy to switch between chalk writing and multimedia applications. The same area can be used for normal writing with chalk like an ordinary blackboard, or for viewing various rich multimedia applications such as PPT, videos, pictures, animations, etc. by touching the same area like a tablet computer.

[0048] Figure 1a It is a structural schematic diagram of an existing secondary screen device. Figure 1b for Figure 1a Schematic diagram of the partial structure of the secondary screen device.

[0049] like Figure 1a and Figure 1b As shown, the existing sub-screen device 100 is composed of a frame assembly 10, a wall mount 20, a sub-screen 30 and a main-sub-screen splicing adapter 40, wherein the frame assembly 10 includes an upper frame 101, a lower frame 102, a left frame 103, a right frame 104, a corner 105 connected between adjacent frames and an upper frame adapter 106, the upper frame 101, the lower frame 102, the left frame 103 and the right frame 104 form a frame for accommodating the sub-screen 30, and the upper frame 101, the lower frame 102, the left frame 103 and the right frame 104 are respectively fastened to the sub-screen 30 by screws 50, and the sub-screen 30 is made of an aluminum honeycomb composite panel.

[0050] However, the existing sub-screen device 100 has a complex overall structure, and the frame assembly 10 and the sub-screen 30 are fastened together by a circle of screws 50, which makes the assembly complicated and the labor cost high. In addition, because the sub-screen 30 adopts an aluminum honeycomb composite panel, the writing board surface needs to be bent and hemmed on all four sides, and then bonded and composited with the aluminum honeycomb layer. The bending process is complicated, the production capacity is low, and the external dimensional accuracy is poor, which affects the assembly with the frame assembly 10, making the assembly difficult, and there will be a problem of exceeding the front gap (the gap between the sub-screen 30 and the frame assembly 10).

[0051] Therefore, the embodiments of the present application provide a secondary screen device and a smart blackboard, which overcome the defects of the above-mentioned secondary screen device by changing the structure of the frame assembly, the connection method between the frame assembly and the secondary screen, and the manufacturing process of the secondary screen.

[0052] The embodiments of the present application are described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0053] Figure 2a A schematic diagram of the three-dimensional structure of the secondary screen device provided in an embodiment of the present application. Figure 2b An exploded view of the secondary screen device provided in an embodiment of the present application. Figure 2c A schematic diagram of the three-dimensional structure of the secondary screen in the secondary screen device provided in an embodiment of the present application. Figure 2d for Figure 2c A schematic diagram of the enlarged local structure at point A in the middle. Figure 3a A cross-sectional schematic diagram of the connection status between the secondary screen and the first frame member in the secondary screen device provided in an embodiment of the present application. Figure 3b for Figure 3a A magnified schematic diagram of the local structure at point B in the middle.

[0054] like Figures 2a to 3b As shown, an embodiment of the present application provides a sub-screen device 300 for connecting to a main screen device of a smart blackboard, wherein the sub-screen device 300 includes a sub-screen 1 and a frame assembly 2, wherein the frame assembly 2 includes at least two frame members 21, wherein at least two frame members 21 are assembled together to form a hollow frame, wherein at least one of the two frame members 21 has a side frame 211 extending along its own direction, wherein the side frame 211 and the sub-screen 1 have a protrusion 3, and the other has a groove 4, wherein the extension directions of the protrusion 3 and the groove 4 are both consistent with the extension direction of the side edge of the sub-screen 1, and the protrusion 3 is engaged with the groove 4 to limit the relative position of the frame member 21 and the sub-screen 1 in the thickness direction of the sub-screen 1.

[0055] In the sub-screen device 300 provided in this embodiment, a protrusion 3 is provided on one of the side frame 211 and the sub-screen 1, and a groove 4 is provided on the other, so as to restrict the relative position of the frame member 21 and the sub-screen 1 in the thickness direction of the sub-screen 1, thereby avoiding the position change of the frame member 21 relative to the sub-screen 1 in the thickness direction of the sub-screen 1, so as to improve the reliability of the connection between the internal structures of the sub-screen device 300.

[0056] It should be noted that in order to hang the secondary screen device 300 provided in this embodiment on the wall, the secondary screen device 300 provided in this embodiment also includes two hanging parts 5, the distribution direction of the two hanging parts 5 is consistent with the length direction of the smart blackboard, and the two hanging parts 5 are located at the end of the secondary screen 1 facing the wall, and the two hanging parts 5 are fixed to the secondary screen 1 by threaded fasteners.

[0057] Specifically, the hanging part 5 may include a connecting part and a hanging part, the connecting part is used to connect with the auxiliary screen 1, and the hanging part is used to hang the auxiliary screen device 300 on the wall. Here, the specific shapes of the connecting part and the hanging part are not limited.

[0058] In order to make the structure of the above-mentioned frame assembly 2 simpler and to simplify the assembly, in the present embodiment, at least two frame members 21 include a first frame member 21a and a second frame member 21b, and the first frame member 21a and the second frame member 21b are respectively arranged on different sides of the auxiliary screen 1, and the first frame member 21a is arranged on at least two adjacent sides of the auxiliary screen 1.

[0059] In a specific implementation of this embodiment, the first frame member 21a is arranged on three adjacent sides of the auxiliary screen 1, and the second frame member 21b is arranged on one side of the auxiliary screen 1, so that the first frame member 21a and the second frame member 21b form a rectangular hollow frame, wherein the second frame member 21b includes a side frame 211.

[0060] Specifically, the first frame member 21a is in a "U" shape, and the extension direction of the second frame member 21b is consistent with the height direction of the smart blackboard. It should be noted that the first frame member 21a and the second frame member 21b can also be other feasible shapes, and the shapes of the first frame member 21a and the second frame member 21b are not specifically limited.

[0061] like Figure 2b to Figure 3bAs shown, specifically, the first frame member 21a includes a first frame 212 and a second frame 213, the first frame 212 abuts against the side of the auxiliary screen 1 extending along its height direction, and the second frame member 21b is arranged opposite to the first frame 212; there are two second frames 213, and the two second frames 213 are respectively connected to the two side edges of the auxiliary screen 1 extending along its length direction; the second frame 213 includes a side frame 211 and a protrusion 3, the protrusion 3 is located on the side of the side frame 211 facing the auxiliary screen 1, and the groove 4 is provided on the two side surfaces of the auxiliary screen 1 extending along its length direction, and the protrusion 3 is engaged with the groove 4 to limit the relative position of the first frame member 21a and the auxiliary screen 1 in the thickness direction of the auxiliary screen 1. In this way, the relative position of the first frame member 21a and the auxiliary screen 1 in the thickness direction of the auxiliary screen 1 can be limited on both sides of the height of the auxiliary screen 1.

[0062] like Figure 3b As shown, in some optional embodiments, the protrusion 3 is arranged in the middle of the side frame 211 facing the auxiliary screen 1, and the thickness of the protrusion 3 is equal everywhere, and the groove 4 is a groove body corresponding to the protrusion 3. Specifically, the cross-sectional figure of the first frame member 21a along the height direction of the auxiliary screen 1 is "T" shaped, and the cross-sectional figure of the groove 4 along the height direction of the auxiliary screen 1 is "U" shaped.

[0063] Figure 4a This is a schematic diagram of the planar structure of the secondary screen device provided in an embodiment of the present application. Figure 4b for Figure 4a Enlarged schematic diagram of the local structure at point C in the middle.

[0064] like Figure 4a and Figure 4b As shown, in order to connect the second frame member 21b to the auxiliary screen 1, in this embodiment, the frame assembly 2 also includes a first fastener, and the second frame member 21b and the side of the auxiliary screen 1 are detachably connected through the first fastener.

[0065] In a specific implementation of this embodiment, the first fastener may be a threaded fastener, such as a screw, a bolt, etc. Here, the type of the first fastener is not specifically limited.

[0066] Figure 5a This is a schematic diagram of the front structure of the frame assembly in the secondary screen device provided in an embodiment of the present application. Figure 5b for Figure 5a A magnified schematic diagram of the local structure at point D in the middle. Figure 5c A schematic diagram of the three-dimensional structure of the adapter in the secondary screen device provided in an embodiment of the present application.

[0067] like Figures 4b to 5cAs shown, in the secondary screen device 300 provided in the present application, in order to connect the first frame member 21a and the second frame member 21b, the frame assembly 2 also includes two adapters 22, and the two adapters 22 are respectively arranged on the two ends of the second frame member 21b along its own extension direction; the adapter 22 includes an adapter body 221 and an extension part 222, the first end of the adapter body 221 is connected to the second frame member 21b, the extension part 222 is connected to the second end of the adapter body 221, and the extension direction of the extension part 222 is consistent with the thickness direction of the secondary screen 1; the second frame 213 has a card slot 2131, the card slot 2131 has two groove walls 21311 arranged opposite to each other, the two groove walls 21311 are arranged at intervals in the side extension direction of the secondary screen 1, and the extension part 222 is located in the card slot 2131 and abuts against the groove wall 21311 to limit the relative position of the first frame member 21a and the secondary screen 1 in the length direction of the secondary screen 1.

[0068] like Figure 5c As shown, in a specific implementation manner of the present embodiment, the adapter body 221 includes a first connecting arm 2211 and a second connecting arm 2212 which are perpendicular to each other, the extension direction of the first connecting arm 2211 is consistent with the extension direction of the second frame member 21b, and the first connecting arm 2211 is connected to the second frame member 21b through a threaded fastener, the extension direction of the second connecting arm 2212 is consistent with the length direction of the auxiliary screen 1, and the second connecting arm 2212 is connected to the auxiliary screen 1 through a threaded fastener, the extension portion 222 is arranged on the side of the second connecting arm 2212 away from the wall, and the slot 2131 is arranged on the protrusion 3, the extension portion 222 is located in the slot 2131 and abuts against the slot wall 21311 to limit the relative position of the protrusion 3 and the auxiliary screen 1 in the length direction of the auxiliary screen 1.

[0069] Figure 6 for Figure 2a Enlarged schematic diagram of the local structure at point E in the middle.

[0070] like Figure 6 As shown, in order to limit the relative position between the first frame member 21a and the secondary screen 1 in the height direction of the secondary screen 1, in this embodiment, the frame assembly 2 also includes a limiter, the extension direction of the limiter is consistent with the height direction of the secondary screen 1, the limiter is arranged corresponding to the second frame 213, and the limiter is used to connect the second frame 213 and the secondary screen 1 to limit the relative position of the first frame member 21a and the secondary screen 1 in the height direction of the secondary screen 1. In this way, the position of the first frame member 21a is limited in the thickness direction, length direction and height direction of the secondary screen 1, respectively, so as to ensure the reliable connection between the first frame member 21a and the secondary screen 1, and the reliable connection between the first frame member 21a and the second frame member 21b, so as to improve the reliability of the secondary screen device 300 provided in this embodiment.

[0071] In some optional embodiments, the limiting member may be a threaded fastener, and a limiting hole 2111 corresponding to the limiting member is opened on the side frame 211, the axial direction of the limiting member is consistent with the height direction of the secondary screen 1, and the limiting member passes through the limiting hole 2111 to connect the second frame 213 and the secondary screen 1 to limit the relative position between the first frame member 21a and the secondary screen 1 in the height direction of the secondary screen 1.

[0072] Figure 7 A schematic diagram of the structure of a secondary screen in a secondary screen device provided in an embodiment of the present application.

[0073] like Figure 7 As shown, in order to improve the gap problem between the sub-screen 30 and the frame assembly 10 in the existing sub-screen device 100, in the present application, the sub-screen 1 includes a foaming layer 11, a welding layer 12 and a writing layer 13 which are stacked in sequence, and the writing layer 13 is located on the front of the sub-screen device 300, wherein the writing layer 13 is a galvanized roller coating layer, the welding layer 12 is a polymer film, and the foaming layer 11 is a plastic foaming layer, wherein the polymer film is a film made of an organic polymer.

[0074] In some embodiments, the secondary screen 1 also includes a zinc plate layer 14 opposite to the wall, and a welding layer 12 is sandwiched between the zinc plate layer 14 and the foaming layer 11. It should be noted that the difference between the zinc plate layer 14 and the writing layer 13 is that the zinc plate layer 14 does not need to be rolled.

[0075] Therefore, when manufacturing the auxiliary screen 1, first, the welding layer 12, i.e., the polymer film, is heated and melted at high temperature, and then the writing layer 13 and the foaming layer 11 are welded together through the welding layer 12 for compounding, and then the zinc plate layer 14 and the foaming layer 11 are welded together through the welding layer 12 to form the primary formed auxiliary screen 1; then, the appearance of the auxiliary screen 1 is processed by mechanical processing to obtain the final formed auxiliary screen 1. Therefore, in the process of manufacturing the auxiliary screen 1, the process used is relatively stable, so that the dimensional accuracy of the formed auxiliary screen 1 is better, so that the gap between the auxiliary screen 30 and the frame assembly 10 can be avoided, and the problem of excessive front gap can be improved.

[0076] In order to enable the secondary screen device 300 provided in the present application to be effectively connected and used with other components, the secondary screen device 300 provided in the embodiment of the present application also includes at least one connecting accessory 6 and a second fastener, and the connecting accessory 6 is connected to the secondary screen 1 or the frame assembly 2 through the second fastener, wherein the second fastener can be a threaded fastener such as a self-tapping screw, or other types of fasteners. Here, there is no specific limitation on the type of the second fastener.

[0077] Figure 8a for Figure 2a Enlarged schematic diagram of the local structure at F in the middle. Figure 8b for Figure 2a Enlarged schematic diagram of the local structure at G in the middle.

[0078] like Figure 2a , Figure 2b , Figure 8a and Figure 8b As shown, in this embodiment, the connection accessory 6 includes a connection frame 61, a wall adapter 62, a baffle 63 and a splicing frame 64. The connection frame 61 is detachably connected to the bottom of the secondary screen 1, the wall adapter 62 is detachably connected to the connection frame 61, the baffle 63 is detachably connected to the side of the secondary screen 1 facing the wall, the baffle 63 is close to the edge of the secondary screen 1, and the extension direction of the baffle 63 is consistent with the height direction of the smart blackboard, and the splicing frame 64 is connected to the second frame member 21b through a threaded fastener; specifically, the connection frame 61 and the baffle 63 are both connected to the foaming layer 11. In this way, the connection strength between the connection frame 61 and the baffle 63 and the secondary screen 1 can be improved.

[0079] like Figure 8a As shown, in some optional embodiments, the connecting frame 61 and the wall adapter 62 are both "L" shaped. It should be noted that the connecting frame 61 and the wall adapter 62 can also be other shapes, and other shapes are not specifically introduced here.

[0080] like Figure 8b As shown, in some optional embodiments, the splicing frame 64 includes a protrusion 641 and two connecting parts 642 connected to the protrusion 641, the protrusion 641 is "U"-shaped, and the extension direction of the bottom wall of the protrusion 641 is consistent with the extension direction of the second frame member 21b, and the bottom wall of the protrusion 641 is arranged opposite to the back of the second frame member 21b, and the two connecting parts 642 are distributed at both ends of the protrusion 641 in the extension direction of the second frame member 21b, and the connecting part 642 is connected to the side wall of the protrusion 641, and the extension direction of the connecting part 642 is consistent with the extension direction of the second frame member 21b. The connecting part is connected to the second frame member 21b by a threaded fastener.

[0081] Figure 9a A diagram showing the connection status of the secondary screen and the first frame member in the secondary screen device provided in an embodiment of the present application. Figure 9b for Figure 9a Enlarged schematic diagram of the local structure at H in the middle.

[0082] Combination Figure 9a and Figure 9bWhen installing the secondary screen device 300 provided in the present application, first, push the first frame member 21a on the side of the secondary screen 1 close to the secondary screen so that the protrusion 3 is engaged with the groove 4, and then install the second frame member 21b on the secondary screen 1 through threaded fasteners, and set adapters 22 at both ends of the second frame member 21b along its own extension direction, so that the adapter 22 is connected to the secondary screen 1, and the extension part 222 is engaged with the slot 2131; finally, connect the first frame member 21a and the secondary screen 1 through the limit member, and the secondary screen device 300 is installed.

[0083] The auxiliary screen device provided in this embodiment is used to connect with the main screen device of the smart blackboard. The auxiliary screen device includes an auxiliary screen and a frame assembly. The frame assembly includes at least two frame members. At least two frame members are assembled and enclosed to form a hollow frame. At least one of the two frame members has a side frame extending along its own direction. One of the side frame and the auxiliary screen has a protrusion, and the other has a groove. The extension direction of the protrusion and the groove is consistent with the extension direction of the side of the auxiliary screen. The protrusion is engaged with the groove to limit the relative position of the frame member and the auxiliary screen in the thickness direction of the auxiliary screen. Therefore, the overall structure of the auxiliary screen device provided in this embodiment is relatively simple and the cost is low.

[0084] Fig.10a A schematic diagram of the structure of the smart blackboard provided in an embodiment of the present application. Fig.10b for Fig.10a A magnified schematic diagram of the local structure at point I in the middle.

[0085] like Fig.10a and Fig.10b As shown, this embodiment provides a smart blackboard, including a main screen device 200, a sub-screen device 300 and a main-sub-screen splicing piece 400, and the sub-screen device 300 is connected to the main screen device 200 through the main-sub-screen splicing piece 400. Among them, the specific structure, function and working principle of the sub-screen device 300 have been described in detail in the above embodiments, so they will not be repeated here.

[0086] In a specific implementation manner of this embodiment, the main and sub-screen splicing parts 400 include a fixing part 401 and two plug-in parts 402. The extension direction of the fixing part 401 is consistent with the length direction of the main screen device 200. The two plug-in parts 402 are located on the side of the fixing part 401 that is away from the end face of the main screen device 200 in the thickness direction of the main screen device 200. The adapter 22 has a protruding positioning part 223, and the positioning part 223 is arranged at the transition connection between the first connecting arm 2211 and the second connecting arm 2212. The positioning part 223 has a slot, one plug-in part 402 is plugged into the slot, and the other plug-in part 402 is plugged into the main screen device 200 to realize the connection between the sub-screen device 300 and the main screen device 200.

[0087] Specifically, in the smart blackboard provided in this embodiment, the secondary screen device 300 is installed first, and then the secondary screen device 300 and the main screen device 200 are connected through the main-secondary screen splicing component 400.

[0088] It should be noted that the installation steps of the secondary screen device 300 have been described in detail in the above embodiment, and will not be repeated here.

[0089] The smart blackboard provided in this embodiment includes a main screen device, a sub-screen device and a main-sub-screen splicing piece, and the sub-screen device is connected to the main screen device through the main-sub-screen splicing piece, wherein the sub-screen device includes a sub-screen and a frame assembly, the frame assembly includes at least two frame members, at least two frame members are spliced ​​together to form a hollow frame, at least one of the two frame members has a side frame extending along its own direction, one of the side frame and the sub-screen has a protrusion, and the other has a groove, the extension direction of the protrusion and the groove are consistent with the extension direction of the side of the sub-screen, and the protrusion is engaged with the groove to limit the relative position of the frame member and the sub-screen in the thickness direction of the sub-screen. Therefore, the structure of the smart blackboard provided in this embodiment is relatively simple and the cost is low.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A secondary screen device, characterized in that: Used to connect with the main screen device of the smart blackboard, the auxiliary screen device includes an auxiliary screen and a frame assembly, the frame assembly includes at least two frame members, the at least two frame members are assembled together to form a hollow frame, one of the at least two frame members has a side frame extending along its own direction, the side frame and one of the auxiliary screen have a protrusion, and the other has a groove, the extension direction of the protrusion and the groove are consistent with the extension direction of the side of the auxiliary screen, the protrusion is clamped with the groove to limit the relative position of the frame member and the auxiliary screen in the thickness direction of the auxiliary screen; The at least two frame members include a first frame member and a second frame member, the first frame member includes a first frame and two second frames, wherein the first frame abuts against a side edge of the secondary screen extending along the height direction thereof, the second frame member is arranged opposite to the first frame, and the two second frames are arranged opposite to each other; The frame assembly further includes two adapters, which are respectively arranged on two ends of the second frame member along its own extension direction; the adapter includes an adapter body and an extension part, the first end of the adapter body is connected to the second frame member, the extension part is connected to the second end of the adapter body, and the extension direction of the extension part is consistent with the thickness direction of the secondary screen; The second frame has a slot, the slot has two slot walls that are arranged opposite to each other, the two slot walls are arranged at intervals in the side extension direction of the secondary screen, the extension portion is located in the slot and abuts against the slot wall, so as to limit the relative position of the first frame member and the secondary screen in the length direction of the secondary screen; The frame assembly also includes a limit member, the extension direction of the limit member is consistent with the height direction of the secondary screen, the limit member is arranged corresponding to the second frame, and the limit member is used to connect the second frame and the secondary screen to limit the relative position of the first frame and the secondary screen in the height direction of the secondary screen.

2. The secondary screen device according to claim 1, characterized in that: The first frame member and the second frame member are respectively arranged on different sides of the auxiliary screen, and the first frame member is arranged on at least two adjacent sides of the auxiliary screen.

3. The secondary screen device according to claim 2, characterized in that: The first frame member is arranged around three adjacent sides of the secondary screen.

4. The secondary screen device according to claim 3, characterized in that: The two second frames are respectively connected to two side edges of the secondary screen extending along the length direction thereof; The protrusion is provided on the second frame and is located on the side of the second frame facing the secondary screen. The protrusion is engaged with the groove to limit the relative position of the first frame member and the secondary screen in the thickness direction of the secondary screen.

5. The secondary screen device according to claim 4, characterized in that: The frame assembly also includes a first fastener, and the second frame member is detachably connected to the side of the secondary screen via the first fastener.

6. The secondary screen device according to claim 4, characterized in that: The auxiliary screen comprises a foaming layer, a welding layer and a writing layer which are stacked in sequence, and the writing layer is located on the front side of the auxiliary screen device.

7. The secondary screen device according to claim 6, characterized in that: It also includes at least one connecting accessory and a second fastener, wherein the connecting accessory is connected to the secondary screen or the frame assembly through the second fastener; The connection accessories include at least one of the following: a connection frame, a baffle, and a splicing frame.

8. A smart blackboard, characterized in that: It comprises a main screen device and a secondary screen device as described in any one of claims 1-7.

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