Propaganda device and monitoring system

Abstract

The invention provides a propaganda device and a monitoring system. The propaganda device comprises a propaganda board, four mounting structures, four fixing structures and a supporting structure. Wherein the four mounting structures are respectively provided with a mounting groove; the four frames of the billboard are in one-to-one correspondence and are detachably inserted into the four mounting grooves, and every two adjacent mounting structures are in butt joint; the four fixing structures are provided with fixing grooves respectively, and the fixing grooves are L-shaped grooves. The four fixing grooves are in one-to-one correspondence and detachably arranged on the four opposite angles of the billboard in a sleeving mode. The supporting structure is arranged on the supporting base surface; the supporting structure is detachably connected with the fixing structure. The billboard is used for propagandizing materials; the four frames of the billboard are fixed by arranging the mounting structure; the butt joint position of every two adjacent mounting structures is fixed through each fixing structure; the billboard is supported by arranging the supporting structure, and the problem that an advertisement billboard in the prior art is inconvenient to replace is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of advertising, and in particular to a advertising device and a monitoring system. Background Art

[0002] At present, various types of billboards or billboard stands are mostly welded with stainless steel parts, and the content of their propaganda is mostly fixed. Although some billboard stands are similar to display stands used in campuses, and the content of their propaganda can be replaced, they are mainly displayed or replaced in the form of posted printed materials, which makes their operation more cumbersome; and it is not convenient to monitor when the billboards and the objects posted on them are damaged.

[0003] The prior art provides an advertising billboard, which includes a support column and a background plate fixed on the support column, a groove is recessed on one side of the background plate, a fixing assembly for fixing the promotional paper is arranged between a pair of groove side walls opposite to the groove; the fixing assembly includes a fixing rod, the fixing rod is inserted between a pair of groove side walls opposite to the groove, the groove side wall of the groove is provided with a slot for the fixing rod to be inserted, the groove bottom of the slot is fixedly connected with an elastic member, and the fixing rod is clamped between the two elastic members. However, this advertising billboard is cumbersome to operate when changing the displayed content, and the appearance is not good.

[0004] The prior art also provides an intelligent solar LED advertising billboard that can generate electricity by itself and realize a publicity function based on audio playback, but it is expensive and consumes a lot of energy, and is not suitable for ordinary publicity. Summary of the invention

[0005] The main purpose of the present invention is to provide a publicity device and a monitoring system to solve the problem that the advertising billboards in the prior art are inconvenient to replace.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a promotional device, comprising: a promotional board for promotional materials; four mounting structures, each having a mounting groove, the four frames of the promotional board corresponding to each other and detachably inserted into the four mounting grooves, and two adjacent mounting structures butted against each other; four fixing structures, each having a fixing groove, which is an L-shaped groove; the four fixing grooves corresponding to each other and detachably sleeved on the four diagonals of the promotional board, so as to fix the butt joints of two adjacent mounting structures through each fixing structure; a supporting structure, arranged on a supporting base, the supporting structure being detachably connected to the fixed structure, so as to support the promotional board.

[0007] Furthermore, a first plug-in portion is provided on one side of the mounting structure away from the mounting groove; the fixed structure has a second plug-in portion provided corresponding to the first plug-in portion, so that the fixed structure and the mounting structure can be detachably connected by plugging the first plug-in portion with the second plug-in portion.

[0008] Further, the first plug-in portion is a plug-in groove; the second plug-in portion is a plug-in protrusion; or the first plug-in portion is a plug-in protrusion; the second plug-in portion is a plug-in groove.

[0009] Further, there are multiple first plug-in parts, and the multiple first plug-in parts are arranged at intervals along the plug-in direction perpendicular to the mounting structure; there are multiple second plug-in parts, and the multiple second plug-in parts are plugged into the multiple first plug-in parts one by one; and / or the cross-section of the first plug-in part along the direction perpendicular to its extension is T-shaped; the cross-section of the second plug-in part along the direction perpendicular to its extension is T-shaped, so as to limit the plug-in between the first plug-in part and the second plug-in part.

[0010] Furthermore, the supporting structure includes: a mounting base, which is fixed on the supporting base surface through a mounting flange and a fourth connecting member; a supporting column, which is connected to the mounting base through a first connecting member, and the supporting column extends in a vertical direction; a mounting member, which is connected to the fixed structure; and the mounting member is detachably mounted on the supporting column to detachably mount the fixed structure on the supporting column.

[0011] Furthermore, the support structure also includes: a locking piece, the first end of which passes through the threaded hole of the mounting piece and abuts against the support column, so that the mounting piece is locked on the support column through the threaded connection between the locking piece and the threaded hole; an operating part, which is arranged at the second end of the locking piece, so that the locking piece can be screwed into or out of the threaded hole by rotating the operating part.

[0012] According to another aspect of the present invention, there is provided a monitoring system, comprising: the above-mentioned publicity device; a monitoring structure, which is arranged on the supporting structure of the publicity device, and the camera part of the monitoring structure is arranged toward the publicity board of the publicity device; and a power supply structure, which is electrically connected to the monitoring structure to supply power to the monitoring structure.

[0013] Furthermore, the power supply structure includes: a photoelectric conversion unit installed on one of the mounting structures of the promotional device; the photoelectric conversion unit is made of semiconductor material to convert light energy into electrical energy; and a power storage unit is electrically connected to the photoelectric conversion unit and the monitoring structure respectively to supply power to the monitoring structure.

[0014] Furthermore, the monitoring system also includes: a connecting bracket connected to the photoelectric conversion unit; the connecting bracket has a first mounting hole, the mounting structure has a second mounting hole, the second mounting hole is connected to the first plug-in portion of the mounting structure, so that the second connecting member can pass through the first mounting hole and be inserted into the second mounting hole to connect the connecting bracket to the mounting structure.

[0015] Furthermore, the monitoring system also includes: a control module, which is communicatively connected to the monitoring structure to receive the monitoring results of the monitoring structure and send out a warning signal when it is determined that the billboard is damaged; an alarm structure, which is communicatively connected to the control module, and the alarm structure includes a light emitter and a voice emitter to activate the alarm structure when the alarm signal is received; the alarm structure is electrically connected to the power supply structure to supply power to the alarm structure through the power supply structure.

[0016] Applying the technical solution of the present invention, the present invention provides a publicity device, which includes a publicity board, four mounting structures, four fixed structures and a supporting structure. Among them, the four mounting structures respectively have mounting grooves; the four frames of the publicity board are inserted into the four mounting grooves one by one and detachably, and two adjacent mounting structures are butted; the four fixed structures respectively have fixing grooves, which are L-shaped grooves; the four fixing grooves are respectively and detachably sleeved on the four diagonal corners of the publicity board; the supporting structure is arranged on the supporting base surface; the supporting structure is detachably connected with the fixed structure. The publicity board is used for publicity materials; the mounting structure is arranged to fix the four frames of the publicity board; each fixed structure is used to fix the butt joints of two adjacent mounting structures; the supporting structure is arranged to support the publicity board, so that the purpose of facilitating the loading and unloading of the publicity board is achieved through the detachable connection between the mounting structure and the publicity board, the detachable connection between the fixed structure and the mounting structure, and the detachable connection between the supporting structure and the fixed structure, thereby solving the problem that the advertising publicity board in the prior art is not convenient for replacement operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A structural diagram showing a first perspective of a publicity board, a mounting structure and a fixing structure of a publicity device according to the present invention;

[0019] Figure 2 A structural diagram from a second viewing angle showing a propaganda board, a mounting structure and a fixing structure of the propaganda device according to the present invention;

[0020] Figure 3 A schematic structural explosion diagram showing a propaganda board, a mounting structure and a fixing structure of a propaganda device according to the present invention;

[0021] Figure 4 A schematic structural diagram showing a fixing structure of a promotional device according to the present invention is shown;

[0022] Figure 5 A schematic structural diagram showing the installation structure of the promotional device according to the present invention;

[0023] Figure 6 A schematic cross-sectional structure diagram of a publicity board, a mounting structure and a fixing structure of a publicity device according to the present invention is shown;

[0024] Figure 7 A schematic structural diagram of an embodiment of a promotional device according to the present invention is shown;

[0025] Figure 8 A schematic diagram showing the structure of the fixing structure and the mounting member of the publicity device according to the present invention installed on the publicity board;

[0026] Fig. 9 A schematic diagram showing the structure of the connection between the support column and the mounting base of the promotion device according to the present invention;

[0027] Fig.10 A schematic diagram showing the structure of the connection between the fixing structure and the mounting member of the promotion device according to the present invention is shown;

[0028] Fig.11 A schematic diagram of the overall structure of a monitoring system according to an embodiment of the present invention from a first viewing angle is shown;

[0029] Fig.12 A second perspective overall structural diagram of an embodiment of a monitoring system according to the present invention is shown;

[0030] Fig.13 A schematic diagram showing a structure in which a power supply structure of a monitoring system according to the present invention is installed on a mounting structure;

[0031] Fig.14 A schematic diagram showing the structure of a connecting bracket of a promotional device according to the present invention is shown;

[0032] Fig.15 A schematic diagram showing the structure of the tripod and the connecting seat of the promotional device according to the present invention is shown;

[0033] Fig.16 A structural cross-sectional view showing the connection between the connecting bracket and the mounting structure of the promotion device according to the present invention.

[0034] The above drawings include the following reference numerals:

[0035] 1. Billboard; 11. Frame; 12. Diagonal; 2. Mounting structure; 21. Mounting slot; 22. First plug-in part; 23. Second mounting hole; 3. Fixing structure; 31. Fixing slot; 32. Second plug-in part; 4. Support structure; 41. Mounting base; 42. Mounting flange; 43. First connecting piece; 44. Support column; 45. Mounting piece; 46. Locking piece; 47. Threaded hole; 48. Operating part; 5. Monitoring structure; 6. Power supply structure; 61. Photoelectric conversion unit; 62. Power storage unit; 7. Connecting bracket; 71. First mounting hole; 72. Second connecting piece; 73. Tripod; 74. Connecting seat; 75. Third connecting piece; 8. Control module; 9. Warning structure. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] Please refer to Figures 1 to 16 The present invention provides a publicity device, which includes a publicity board 1, four mounting structures 2, four fixing structures 3 and a supporting structure 4. The publicity board 1 is used for publicity materials; the four mounting structures 2 respectively have mounting grooves 21, and the four frames 11 of the publicity board 1 are correspondingly and detachably inserted into the four mounting grooves 21, and two adjacent mounting structures 2 are butted; the four fixing structures 3 respectively have fixing grooves 31, and the fixing grooves 31 are L-shaped grooves; the four fixing grooves 31 are correspondingly and detachably sleeved on the four diagonal corners 12 of the publicity board 1, so as to fix the butt joints of two adjacent mounting structures 2 through each fixing structure 3; the supporting structure 4 is arranged on a supporting base surface, and the supporting structure 4 is detachably connected with the fixing structure 3 to support the publicity board 1.

[0038] The present invention provides a publicity device, which includes a publicity board 1, four mounting structures 2, four fixing structures 3 and a supporting structure 4. The publicity board 1 is used for publicity materials; the mounting structures 2 are used to fix four frames 11 of the publicity board 1; each fixing structure 3 is used to fix the joints of two adjacent mounting structures 2; and the supporting structure 4 is used to support the publicity board 1. Thus, the purpose of facilitating the installation and removal of the publicity board 1 is achieved through the detachable connection between the mounting structure 2 and the publicity board 1, the detachable connection between the fixing structure 3 and the mounting structure 2, and the detachable connection between the supporting structure 4 and the fixing structure 3, thereby solving the problem that the advertising publicity board in the prior art is not convenient for replacement operation.

[0039] Specifically, in order to realize the detachable connection between the mounting structure 2 and the fixed structure 3, a first plug-in portion 22 is provided on a side of the mounting structure 2 away from the mounting groove 21; the fixed structure 3 has a second plug-in portion 32 arranged corresponding to the first plug-in portion 22, so that the fixed structure 3 and the mounting structure 2 can be detachably connected by plugging the first plug-in portion 22 with the second plug-in portion 32.

[0040] Optionally, the specific implementation structure of the mounting structure 2 and the fixing structure 3 in the embodiment of the present application is:

[0041] A specific implementation structure is: Figure 4 and Figure 5 As shown, the first plug-in portion 22 is a plug-in groove; and the second plug-in portion 32 is a plug-in protrusion.

[0042] Another specific implementation structure is: the first plug-in portion 22 is a plug-in protrusion; the second plug-in portion 32 is a plug-in groove.

[0043] Furthermore, in order to improve the stability of the connection between the mounting structure 2 and the fixed structure 3, there are multiple first plug-in parts 22, and the multiple first plug-in parts 22 are arranged at intervals along the plug-in direction perpendicular to the mounting structure 2; there are multiple second plug-in parts 32, and the multiple second plug-in parts 32 are plugged into the multiple first plug-in parts 22 one by one.

[0044] Optionally, in the embodiment of the present application, there are two first plug-in portions 22 , and the two first plug-in portions 22 are respectively arranged on both sides of the mounting groove 21 , so as to improve the stability of the fixing structure 3 fixing the mounting structure 2 .

[0045] Furthermore, the first plug-in portion 22 has a T-shaped cross section perpendicular to its extension direction; the second plug-in portion 32 has a T-shaped cross section perpendicular to its extension direction, so as to limit the insertion between the first plug-in portion 22 and the second plug-in portion 32 .

[0046] Optionally, in order to facilitate the docking between two adjacent mounting structures 2, the docking surfaces of the two adjacent mounting structures 2 are inclined surfaces; and the fixing groove 31 is set as an L-shaped groove to enclose the docking point of the two adjacent mounting structures 2.

[0047] Specifically, in order to install the support structure 4 on the support base, the support structure 4 includes a mounting base 41, a support column 44, and a mounting member 45. The mounting base 41 is fixed to the support base through a mounting flange 42 and a fourth connecting member; the support column 44 is connected to the mounting base 41 through a first connecting member 43, and the support column 44 extends in a vertical direction; the mounting member 45 is connected to the fixed structure 3; the mounting member 45 is detachably mounted on the support column 44 to detachably mount the fixed structure 3 on the support column 44.

[0048] Alternatively, if Fig. 9 As shown, a mounting flange 42 is welded along the circumference of the mounting base 41; the fourth connecting member is a bolt; there are multiple fourth connecting members, and the multiple fourth connecting members are arranged at intervals along the circumference of the mounting flange 42; a first connecting hole is provided at one end of the support column 44 close to the mounting base 41; a second connecting hole corresponding to the first connecting hole is provided on the side wall of the mounting base 41, and the first connecting member 43 is a bolt and a nut, so that the bolt passes through the first connecting hole and the second connecting hole and is threadedly connected with the nut to fix the support column 44 to the mounting base 41.

[0049] Furthermore, in order to connect the fixed structure 3 with the supporting structure 4, the supporting structure 4 also includes a locking member 46 and an operating part 48. The first end of the locking member 46 passes through the threaded hole 47 of the mounting member 45 and abuts against the supporting column 44, so that the mounting member 45 is locked on the supporting column 44 through the threaded connection between the locking member 46 and the threaded hole 47; the operating part 48 is arranged at the second end of the locking member 46, so that the locking member 46 can be screwed into or out of the threaded hole 47 by rotating the operating part 48.

[0050] Optionally, the locking member 46 is a threaded rod of a bolt; the operating portion 48 is a nut of the bolt, so as to drive the threaded rod to rotate by clamping the nut.

[0051] Optionally, the support column 44 is a PVC pipe.

[0052] The present invention also provides a monitoring system, such as Figures 11 to 16 As shown, the monitoring system includes the above-mentioned publicity device, a monitoring structure 5 and a power supply structure 6. The monitoring structure 5 is arranged on the supporting structure 4 of the publicity device, and the camera part of the monitoring structure 5 is arranged toward the publicity board 1 of the publicity device; the power supply structure 6 is electrically connected to the monitoring structure 5 to supply power to the monitoring structure 5.

[0053] Optionally, the monitoring structure 5 is a camera device.

[0054] Specifically, in order to save energy, the power supply structure 6 includes a photoelectric conversion unit 61 and a power storage unit 62. The photoelectric conversion unit 61 is installed on one of the installation structures 2 of the advertising device. The photoelectric conversion unit 61 is made of semiconductor material to convert light energy into electrical energy. The power storage unit 62 is electrically connected to the photoelectric conversion unit 61 and the monitoring structure 5, respectively, to supply power to the monitoring structure 5. This arrangement enables the monitoring structure 5 to be powered by converting light energy into electrical energy when there is light, and the excess electrical energy converted from light energy is stored in the power storage unit 62; when there is no light, the power storage unit 62 is used to power the monitoring structure 5.

[0055] Optionally, the photoelectric conversion unit 61 is a photovoltaic panel; and the power storage unit 62 is a battery.

[0056] Furthermore, in order to facilitate the installation of the power supply structure 6, the monitoring system also includes a connecting bracket 7, which is connected to the photoelectric conversion unit 61; the connecting bracket 7 has a first mounting hole 71, and the mounting structure 2 has a second mounting hole 23, and the second mounting hole 23 is connected to the first plug-in portion 22, so that the second connecting member 72 passes through the first mounting hole 71 and is inserted into the second mounting hole 23, so that the connecting bracket 7 is connected to the mounting structure 2, so that the photoelectric conversion unit 61 of the power supply structure 6 is set toward the light source.

[0057] Preferably, the second mounting hole 23 is communicated with the first plug-in portion 22 , so that the second connecting member 72 enters the second mounting hole 23 through the first plug-in portion 22 .

[0058] Alternatively, if Figures 13 to 16 As shown, the connection bracket 7 in the embodiment of the present application includes a tripod 73 and a connection seat 74, wherein the two ends of the tripod 73 are respectively connected to the power supply structure 6 and the connection seat 74, and the end of the connection seat 74 away from the tripod 73 is connected to the mounting structure 2. The tripod 73 is provided with a mounting hole, and the connection seat 74 is provided with a connection hole corresponding to the mounting hole of the tripod 73, so that the third connection member 75 passes through the mounting hole of the tripod 73 and the connection hole of the connection seat 74 in sequence to disassemble and connect the connection seat 74 and the tripod 73.

[0059] Preferably, the third connecting member 75 is a bolt and a nut.

[0060] In addition, in order to serve as a warning, the monitoring system also includes a control module 8 and a warning structure 9. The control module 8 is communicatively connected to the monitoring structure 5 to receive the monitoring results of the monitoring structure 5 and to send out a warning signal when it is determined that the billboard 1 is damaged; the warning structure 9 is communicatively connected to the control module 8, and the warning structure 9 includes a light emitter and a voice emitter to start the warning structure 9 when the warning signal is received; the warning structure 9 is electrically connected to the power supply structure 6 to supply power to the warning structure 9 through the power supply structure 6.

[0061] Optionally, after the warning structure 9 is activated, the light emitter emits red light; the voice device broadcasts the warning voice in a loop.

[0062] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0063] The present invention provides a publicity device, which includes a publicity board 1, four mounting structures 2, four fixing structures 3 and a supporting structure 4. The publicity board 1 is used for publicity materials; the mounting structures 2 are used to fix four frames 11 of the publicity board 1; each fixing structure 3 is used to fix the joints of two adjacent mounting structures 2; and the supporting structure 4 is used to support the publicity board 1. Thus, the purpose of facilitating the installation and removal of the publicity board 1 is achieved through the detachable connection between the mounting structure 2 and the publicity board 1, the detachable connection between the fixing structure 3 and the mounting structure 2, and the detachable connection between the supporting structure 4 and the fixing structure 3, thereby solving the problem that the advertising publicity board in the prior art is not convenient for replacement operation.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A promotional device, characterized in that: include: Promotional board (1), used for promotional materials; Four mounting structures (2), each having a mounting groove (21), the four frames (11) of the billboard (1) corresponding to each other and detachably inserted into the four mounting grooves (21), and two adjacent mounting structures (2) butting against each other; The four fixing structures (3) each have a fixing groove (31), wherein the fixing groove (31) is an L-shaped groove; the four fixing grooves (31) are correspondingly and detachably sleeved on the four diagonal corners (12) of the billboard (1), so that the butt joints of two adjacent mounting structures (2) can be fixed by each fixing structure (3); A supporting structure (4) is arranged on a supporting base surface, and the supporting structure (4) is detachably connected to the fixing structure (3) to support the publicity board (1).

2. The promotional device according to claim 1, characterized in that: A first plug-in portion (22) is provided on a side of the mounting structure (2) away from the mounting groove (21); the fixed structure (3) has a second plug-in portion (32) provided corresponding to the first plug-in portion (22), so that the fixed structure (3) and the mounting structure (2) can be detachably connected by plugging the first plug-in portion (22) with the second plug-in portion (32).

3. The advertising device according to claim 2, characterized in that: The first plug-in portion (22) is a plug-in groove; the second plug-in portion (32) is a plug-in protrusion; or The first plug-in portion (22) is a plug-in protrusion; the second plug-in portion (32) is a plug-in groove.

4. The advertising device according to claim 2, characterized in that: There are a plurality of the first plug-in parts (22), and the plurality of the first plug-in parts (22) are arranged at intervals along a plug-in direction perpendicular to the mounting structure (2); there are a plurality of the second plug-in parts (32), and the plurality of the second plug-in parts (32) are plugged into the plurality of the first plug-in parts (22) in a one-to-one correspondence; and / or The first plug-in portion (22) has a T-shaped cross section along a direction perpendicular to its extension; the second plug-in portion (32) has a T-shaped cross section along a direction perpendicular to its extension, so as to limit the insertion between the first plug-in portion (22) and the second plug-in portion (32).

5. The advertising device according to any one of claims 1 to 4, characterized in that: The support structure (4) comprises: A mounting base (41) is fixed on the supporting base surface via a mounting flange (42) and a fourth connecting member; A support column (44) connected to the mounting base (41) via a first connecting member (43), wherein the support column (44) extends in a vertical direction; A mounting member (45) is connected to the fixed structure (3); the mounting member (45) is detachably mounted on the support column (44) so ​​as to detachably mount the fixed structure (3) on the support column (44).

6. The advertising device according to claim 5, characterized in that: The support structure (4) further comprises: a locking member (46), wherein a first end of the locking member (46) passes through a threaded hole (47) of the mounting member (45) and abuts against the support column (44), so as to lock the mounting member (45) on the support column (44) through a threaded connection between the locking member (46) and the threaded hole (47); An operating portion (48) is arranged at the second end of the locking member (46) so as to screw the locking member (46) into or out of the threaded hole (47) by rotating the operating portion (48).

7. A monitoring system, characterized in that: include: The promotional device according to any one of claims 1 to 6; A monitoring structure (5) is arranged on the supporting structure (4) of the publicity device, and a camera portion of the monitoring structure (5) is arranged toward the publicity board (1) of the publicity device; A power supply structure (6) is electrically connected to the monitoring structure (5) to supply power to the monitoring structure (5).

8. The monitoring system according to claim 7, characterized in that: The power supply structure (6) comprises: A photoelectric conversion unit (61) is mounted on one of the mounting structures (2) of the advertising device; the photoelectric conversion unit (61) is made of semiconductor material to convert light energy into electrical energy; The power storage unit (62) is electrically connected to the photoelectric conversion unit (61) and the monitoring structure (5) respectively to supply power to the monitoring structure (5).

9. The monitoring system according to claim 8, characterized in that: The monitoring system also includes: A connecting bracket (7) is connected to the photoelectric conversion unit (61); the connecting bracket (7) has a first mounting hole (71), and the mounting structure (2) has a second mounting hole (23); the second mounting hole (23) is connected to a first plug-in portion (22) of the mounting structure (2), so that a second connecting member (72) passes through the first mounting hole (71) and is inserted into the second mounting hole (23), so that the connecting bracket (7) is connected to the mounting structure (2).

10. The monitoring system according to claim 7, characterized in that: The monitoring system also includes: A control module (8) is connected to the monitoring structure (5) for receiving the monitoring result of the monitoring structure (5) and sending out a warning signal when it is determined that the propaganda board (1) is damaged; The warning structure (9) is communicatively connected with the control module (8), and the warning structure (9) comprises a light emitter and a voice emitter, so as to activate the warning structure (9) when the warning signal is received; the warning structure (9) is electrically connected with the power supply structure (6) so as to supply power to the warning structure (9) through the power supply structure (6).

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