CN208225303U - A kind of multimedia interactive teaching lectern - Google Patents

A kind of multimedia interactive teaching lectern Download PDF

Info

Publication number
CN208225303U
CN208225303U CN201721487933.3U CN201721487933U CN208225303U CN 208225303 U CN208225303 U CN 208225303U CN 201721487933 U CN201721487933 U CN 201721487933U CN 208225303 U CN208225303 U CN 208225303U
Authority
CN
China
Prior art keywords
tables
support arm
desk
interactive teaching
whiteboard
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201721487933.3U
Other languages
Chinese (zh)
Inventor
寿韬
杨伯汉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Leadpideas System Co Ltd
Original Assignee
Shanghai Leadpideas System Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Leadpideas System Co Ltd filed Critical Shanghai Leadpideas System Co Ltd
Priority to CN201721487933.3U priority Critical patent/CN208225303U/en
Application granted granted Critical
Publication of CN208225303U publication Critical patent/CN208225303U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Drawing Aids And Blackboards (AREA)

Abstract

本实用新型提供了一种多媒体互动教学讲桌,包括讲桌台、盖板、手写板、支撑臂和微型投影仪;盖板位于讲桌台上方,并与讲桌台通过铰接轴转动连接;手写板安装于讲桌台表面槽台内;盖板的上表面设有白板,盖板的下表面设有显示器;支撑臂可转动连接于盖板与铰接轴相对的侧面;微型投影仪安装于支撑臂的顶端且微型投影仪的投射方向朝向白板;支撑臂的侧面还设有网络数据接口并与手写板电连接。本实用新型通过结构优化设计,使本讲桌能快速变成简易的白板使用;并且将手写板与微型投影仪、白板等设备结合,并采用多媒体技术,可同时满足电子教学的投影需求和实时同步辅导需求。

The utility model provides a multimedia interactive teaching desk, which comprises a desk platform, a cover plate, a handwriting board, a support arm and a miniature projector; the cover plate is located above the desk platform, and is rotatably connected with the desk platform through a hinge shaft; The handwriting board is installed in the groove on the surface of the desk; the upper surface of the cover is provided with a whiteboard, and the lower surface of the cover is provided with a display; the support arm is rotatably connected to the opposite side of the cover and the hinge shaft; the micro projector is installed on The top of the support arm and the projection direction of the micro-projector face the whiteboard; the side of the support arm is also provided with a network data interface and is electrically connected to the handwriting board. The utility model enables the desk to be quickly turned into a simple whiteboard through the structural optimization design; and the handwriting board is combined with a miniature projector, a whiteboard and other equipment, and multimedia technology is adopted, which can simultaneously meet the projection requirements of electronic teaching and real-time Synchronize tutoring needs.

Description

一种多媒体互动教学讲桌A multimedia interactive teaching desk

技术领域technical field

本实用新型涉及一种讲桌,尤其涉及一种互动教学讲桌。The utility model relates to a desk, in particular to an interactive teaching desk.

背景技术Background technique

计算机在人们的日常生活中已普遍应用,扮演着重要的角色。手写板作为一种计算机输入设备也得到了长足的发展,相比如键盘输入,手写板还可以用来制图书写。手写板一般是使用一支专门的笔在特定区域内书写文字或者绘图。手写板通过各种方法将笔走过的轨迹记录下来,然后通过计算机进行识别处理。现有的手写板通常在装置上设定一个特定大小的手写区域,该区域使用触控面板材料,使用者用笔与该触控面板进行接触,接触面板材料将书写过的轨迹传给计算机并换算成坐标信息在屏幕上显示出来。Computers have been widely used in people's daily life and play an important role. As a computer input device, the tablet has also been developed by leaps and bounds. Compared with keyboard input, the tablet can also be used for drawing and writing. The handwriting tablet generally uses a special pen to write text or draw in a specific area. The handwriting tablet records the trajectory of the pen through various methods, and then recognizes it through a computer. Existing handwriting pads usually set a handwriting area of a specific size on the device. This area uses a touch panel material. The user touches the touch panel with a pen, and the touch panel material transmits the written track to the computer and The converted coordinate information is displayed on the screen.

讲桌是每个教师必备的教学工具,但现有的讲桌往往功能单一,仅仅是老师放置课本进行讲课的工具,随着小班化的增多,往往在小教室内不设置固定的黑板或白板,对学生进行讲解演示时很不方便。The desk is an essential teaching tool for every teacher, but the existing desks often have a single function. They are only a tool for teachers to place textbooks and give lectures. The whiteboard is very inconvenient when explaining and demonstrating to students.

随着多媒体教学技术的发展,现代的教学方式呈现出多元化趋势,因此,如何获得一种适用于小班教学且结合多媒体技术的现代教学模式,这是我们的科研工作者需要努力的方向。With the development of multimedia teaching technology, modern teaching methods are showing a trend of diversification. Therefore, how to obtain a modern teaching mode suitable for small class teaching and combined with multimedia technology is the direction that our researchers need to work hard.

实用新型内容Utility model content

本实用新型所要解决的技术问题是:针对现有技术的缺陷,提供一种多媒体互动教学讲桌,可以将讲桌快速变成白板使用,并同时实现电子教学的投影需求和实时同步辅导需求。The technical problem to be solved by the utility model is: aiming at the defects of the prior art, to provide a multimedia interactive teaching desk, which can quickly turn the desk into a whiteboard for use, and at the same time realize the projection requirements and real-time synchronous tutoring requirements of electronic teaching.

本实用新型为解决上述技术问题采用以下技术方案:The utility model adopts the following technical solutions for solving the above-mentioned technical problems:

一种多媒体互动教学讲桌,包括讲桌台、盖板、手写板、支撑臂和微型投影仪;A multimedia interactive teaching desk, comprising a desk, a cover, a handwriting board, a support arm and a miniature projector;

所述盖板位于所述讲桌台上方,并与所述讲桌台通过铰接轴转动连接;The cover plate is located above the podium and is rotatably connected with the podium through a hinge shaft;

所述手写板安装于讲桌台表面槽台内;The handwriting board is installed in the groove on the surface of the desk;

所述盖板的上表面设有白板,所述盖板的下表面设有显示器;The upper surface of the cover is provided with a whiteboard, and the lower surface of the cover is provided with a display;

所述支撑臂可转动连接于所述盖板与铰接轴相对的侧面;The support arm is rotatably connected to the side of the cover plate opposite to the hinge shaft;

所述微型投影仪安装于所述支撑臂的顶端且微型投影仪的投射方向朝向所述白板;The micro-projector is installed on the top of the support arm and the projection direction of the micro-projector faces the whiteboard;

所述支撑臂的侧面还设有网络数据接口并与所述手写板电连接。The side of the support arm is also provided with a network data interface and is electrically connected with the tablet.

为了优化上述技术方案,本实用新型采取的技术措施还包括:In order to optimize the above-mentioned technical scheme, the technical measures taken by the utility model also include:

进一步地,所述讲桌台的表面还设有电源插口,讲桌台的内部设有备用电池板,所述备用电池板与手写板和显示器电连接;Further, the surface of the desk is also provided with a power socket, and the interior of the desk is provided with a spare battery board, and the spare battery board is electrically connected to the handwriting board and the display;

进一步地,所述讲桌台的两侧设有支撑杆,所述支撑杆与所述讲桌台铰接,在所述讲桌台表面与所述支撑杆相对应的位置设有用于容纳所述支撑杆的凹槽;Further, support rods are provided on both sides of the podium, and the support rods are hinged to the podium, and a position for accommodating the podium is provided on the surface of the podium corresponding to the support poles. Grooves for support rods;

进一步地,所述槽台的槽台壁上设有多个LED灯珠,多个所述LED灯珠均匀分布于手写板上方的槽台壁上并照亮所述手写板的手写屏幕;Further, a plurality of LED lamp beads are arranged on the wall of the groove table, and the plurality of LED lamp beads are evenly distributed on the wall of the groove table above the tablet and illuminate the handwriting screen of the tablet;

进一步地,所述手写板的手写屏幕采用电磁授受感应屏幕;Further, the handwriting screen of the tablet adopts an electromagnetic receiving and receiving induction screen;

进一步地,所述讲桌台的前端设有挡板,该挡板用于限制盖板的转动位置。Further, a baffle is provided at the front end of the podium, and the baffle is used to limit the rotational position of the cover.

本实用新型采用以上技术方案,与现有技术相比,具有如下技术效果:The utility model adopts the above technical scheme, and compared with the prior art, it has the following technical effects:

1)本实用新型通过结构优化设计,在讲桌台上设置可翻转的盖板,在盖板上表面设置白板,从而使本讲桌能快速变成简易的白板使用;1) The utility model adopts structural optimization design, and a reversible cover plate is set on the podium, and a whiteboard is set on the surface of the cover plate, so that the podium can be quickly turned into a simple whiteboard for use;

2)本实用新型将手写板与微型投影仪、白板等设备结合,并采用多媒体技术,使用者可通过手写板的手写轨迹感应,配合投影机在白板上进行投影,可同时满足电子教学的投影需求和实时同步辅导需求。2) This utility model combines the handwriting board with micro-projectors, whiteboards and other equipment, and adopts multimedia technology. The user can sense the handwriting track of the handwriting board and cooperate with the projector to project on the whiteboard, which can meet the projection of electronic teaching at the same time. Demand and real-time synchronous tutoring demand.

附图说明Description of drawings

图1为本实用新型的盖板打开状态的一种优选实施例的结构示意图;Fig. 1 is a schematic structural view of a preferred embodiment of the open state of the cover plate of the present invention;

图2为图1的一种俯视图;Figure 2 is a top view of Figure 1;

图3为图1的一种右视图;Fig. 3 is a kind of right view of Fig. 1;

其中的附图标记为:1-讲桌台;2-盖板;3-手写板;4-支撑臂;5-铰接轴;6-微型投影仪;7-白板;8-显示器;9-网络数据接口;10-电源插口;11-备用电池板;12-支撑杆;13-LED灯珠;14-挡板;15-凹槽;16-投影区。The reference signs are: 1-dais; 2-cover; 3-writing board; 4-support arm; 5-hinge shaft; 6-miniature projector; 7-whiteboard; 8-monitor; 9-network Data interface; 10-power socket; 11-backup battery board; 12-support rod; 13-LED lamp beads; 14-baffle; 15-groove; 16-projection area.

具体实施方式Detailed ways

下面结合附图对本实用新型的技术方案做进一步的详细说明。Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail.

参见图1、图2和图3,一种多媒体互动教学讲桌,包括讲桌台1、盖板2、手写板3、支撑臂4,微型投影仪6,盖板2位于讲桌台1上方,并与讲桌台1通过铰接轴5转动连接;手写板3安装于讲桌台1表面槽台内;盖板2的上表面设有白板7,盖板2的下表面设有显示器8;支撑臂4可转动连接于盖板2与铰接轴5相对的侧面;微型投影仪6安装于支撑臂4的顶端且微型投影仪6的投射方向朝向白板7;支撑臂4的侧面还设有网络数据接口9并与手写板3电连接。Referring to Fig. 1, Fig. 2 and Fig. 3, a multimedia interactive teaching desk includes a desk 1, a cover 2, a handwriting board 3, a support arm 4, a micro projector 6, and the cover 2 is located above the desk 1 , and connected with the desk 1 through the hinge shaft 5; the handwriting board 3 is installed in the surface groove of the desk 1; the upper surface of the cover 2 is provided with a whiteboard 7, and the lower surface of the cover 2 is provided with a display 8; The support arm 4 is rotatably connected to the opposite side of the cover plate 2 and the hinge shaft 5; the micro-projector 6 is installed on the top of the support arm 4 and the projection direction of the micro-projector 6 faces the whiteboard 7; the side of the support arm 4 is also provided with a network The data interface 9 is also electrically connected with the tablet 3 .

支撑臂4转动连接于盖板2与铰接轴5相对的侧面,当需要合上盖板2时,先将支撑臂4转动与盖板2平行,再放下盖板2,从而使盖板2可以平整地覆盖于讲桌台1台面上。The support arm 4 is rotatably connected to the opposite side of the cover plate 2 and the hinge shaft 5. When the cover plate 2 needs to be closed, the support arm 4 is first rotated to be parallel to the cover plate 2, and then the cover plate 2 is put down, so that the cover plate 2 can It covers flatly on the podium 1 table top.

使用时,将讲桌台1的盖板2打开并垂直于讲桌台1台面。若不开启多媒体设备使用设置于盖板2上表面的白板7可直接作为书写白板7用,使用白板7笔书写,从而使本讲桌能快速变成简易的白板7。若开启多媒体设备使用时,设置于支撑臂4侧面的网络数据接口9连接微型投影仪6和手写板3,当在手写板3上采用手写笔进行书写时,显示器8显示书写板上的书写轨迹,用时书写的矢量轨迹以特定的编码方式通过网络数据接口9传输到微型投影仪6上,再通过微型投影仪6将书写轨迹同步投影在白板7上;设置微型投影机的投影角度,使投影区16覆盖整个白板7表面。相比于传统的讲稿投影,本实用新型具有实时同步性,可展示教师授课讲解的过程,在所述显示器8内部还可以设置有存储器,存储器可以存储授课过程,用于后期复习使用;相比于投影仪直接连接电脑,使用鼠标及键盘操作,本实用新型的手写板3操作更便捷,更适应教师的书写习惯,便于发挥。During use, the cover plate 2 of the podium 1 is opened and is perpendicular to the platform of the podium 1 . If the multimedia equipment is not turned on, the whiteboard 7 arranged on the upper surface of the cover plate 2 can be directly used as the writing whiteboard 7, and the whiteboard 7 pens can be used to write, so that the desk can quickly become a simple whiteboard 7. If the multimedia equipment is turned on for use, the network data interface 9 arranged on the side of the support arm 4 connects the micro-projector 6 and the handwriting board 3, and when writing on the handwriting board 3 with a stylus, the display 8 shows the writing track on the writing board , the vector trajectory written in time is transmitted to the micro-projector 6 through the network data interface 9 in a specific encoding mode, and then the writing trajectory is synchronously projected on the whiteboard 7 by the micro-projector 6; the projection angle of the micro-projector is set to make the projection Area 16 covers the entire whiteboard 7 surface. Compared with the traditional lecture projection, the utility model has real-time synchronization, and can display the process of the teacher's teaching and explanation. A memory can also be provided inside the display 8, and the memory can store the teaching process for later review use; The projector is directly connected to the computer, and the handwriting board 3 of the present invention is more convenient to operate, more suitable for teachers' writing habits, and easy to play by using the mouse and keyboard.

本实用新型将微型投影仪设置在白板上方斜向投影于白板上,相比于传统的将投影仪设置在远离投影面的前方,可以避免投影仪与投影面之间被障碍物遮挡,影响投影效果。In the utility model, the miniature projector is arranged above the whiteboard to project obliquely on the whiteboard. Compared with the traditional method of setting the projector far away from the projection surface, it can avoid the obstacle between the projector and the projection surface, which will affect the projection. Effect.

进一步地,讲桌台1的表面还设有电源插口10,讲桌台1的内部设有备用电池板11,备用电池板11与手写板3和显示器8电连接;采用备用电池板11,可防止因为突然断电造成的设备损坏或数据传输失败。Further, the surface of the desk 1 is also provided with a power socket 10, and the inside of the desk 1 is provided with a spare battery board 11, and the spare battery board 11 is electrically connected with the handwriting board 3 and the display 8; Prevent equipment damage or data transmission failure caused by sudden power failure.

进一步地,讲桌台1的两侧设有支撑杆12,支撑杆12与讲桌台1铰接,在讲桌台1表面与支撑杆12相对应的位置设有用于容纳支撑杆12的凹槽15;当需要合上盖板2时,先将支撑杆12放下并置于凹槽15内,再放下盖板2,从而使盖板2可以平整地覆盖于讲桌台1台面上。Further, support rods 12 are provided on both sides of the podium 1, and the support rods 12 are hinged with the podium 1, and grooves for accommodating the support rods 12 are provided on the surface of the podium 1 at positions corresponding to the support rods 12. 15. When the cover 2 needs to be closed, the support rod 12 is first put down and placed in the groove 15, and then the cover 2 is put down, so that the cover 2 can cover the platform 1 evenly.

进一步地,槽台的槽台壁上设有多个LED灯珠13,多个LED灯珠13均匀分布于手写板3上方的槽台壁上并照亮手写板3的手写屏幕;可在光线较暗的情况下当做照明灯使用,便于在手写板3上进行书写。Further, a plurality of LED lamp beads 13 are arranged on the groove platform wall of the groove platform, and a plurality of LED lamp beads 13 are evenly distributed on the groove platform wall above the tablet 3 and illuminate the handwriting screen of the tablet 3; In the darker situation, it is used as a lighting lamp, which is convenient for writing on the tablet 3 .

进一步地,手写板3的手写屏幕采用电磁授受感应屏幕,1024级别压力感应。Further, the handwriting screen of the tablet 3 adopts an electromagnetic receiving and receiving induction screen, and 1024 levels of pressure induction.

进一步地,讲桌台1的前端设有挡板14,该挡板14用于限制盖板2的转动位置,避免盖板2转动时向讲桌前方倾倒。Further, a baffle 14 is provided at the front end of the podium 1, and the baffle 14 is used to limit the rotation position of the cover 2, so as to prevent the cover 2 from falling forward of the podium when it rotates.

由上述实施例可知,本实用新型提供一种多媒体互动教学讲桌,通过结构优化设计,在讲桌台上设置可翻转的盖板,在盖板上表面设置白板,从而使本讲桌能快速变成简易的白板使用;并且本实用新型将手写板与微型投影仪、白板等设备结合,并采用多媒体技术,使用者可通过手写板的手写轨迹感应,配合投影机在白板上进行投影,可同时满足电子教学的投影需求和实时同步辅导需求。It can be known from the above-mentioned embodiments that the utility model provides a multimedia interactive teaching desk. Through structural optimization design, a reversible cover plate is set on the desk platform, and a whiteboard is set on the surface of the cover plate, so that the desk can be used quickly. It becomes a simple whiteboard to use; and the utility model combines the handwriting board with a miniature projector, a whiteboard and other equipment, and adopts multimedia technology. The user can sense the handwriting track of the handwriting board and cooperate with the projector to project on the whiteboard. At the same time, it meets the projection needs of e-learning and the needs of real-time synchronous tutoring.

以上对本实用新型的具体实施例进行了详细描述,但其只作为范例,本实用新型并不限制于以上描述的具体实施例。对于本领域技术人员而言,任何对该实用进行的等同修改和替代也都在本实用新型的范畴之中。因此,在不脱离本实用新型的精神和范围下所作的均等变换和修改,都应涵盖在本实用新型的范围内。The specific embodiments of the present invention have been described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the utility are also within the scope of the utility model. Therefore, all equivalent transformations and modifications made without departing from the spirit and scope of the present invention shall fall within the scope of the present invention.

Claims (6)

1. a kind of multimedia interactive teaching lectern, which is characterized in that including saying tables (1), cover board (2), handwriting pad (3), support Arm (4) and micro projector (6);The cover board (2) is said above tables (1) described in being located at, and says that tables (1) pass through hinge with described Spindle (5) rotation connection;The handwriting pad (3), which is installed on, to be said in tables (1) surface groove platform;The upper surface of the cover board (2) is set Have blank (7), the lower surface of the cover board (2) is equipped with display (8);The support arm (4) is rotationally connected with the cover board (2) with articulated shaft (5) opposite side;The micro projector (6) is installed on top and the micro projection of the support arm (4) The projecting direction of instrument (6) is towards the blank (7);The side of the support arm (4) be additionally provided with network data interface (9) and with institute State handwriting pad (3) electrical connection.
2. a kind of multimedia interactive teaching lectern according to claim 1, which is characterized in that the table for saying tables (1) Face is additionally provided with outlet (10), says that the inside of tables (1) is equipped with reserve battery plate (11), the reserve battery plate (11) and hand Write plate (3) and display (8) electrical connection.
3. a kind of multimedia interactive teaching lectern according to claim 1, which is characterized in that described to say the two of tables (1) Side be equipped with support rod (12), the support rod (12) and it is described say tables (1) hingedly, it is described say tables (1) surface with it is described The corresponding position of support rod (12) is equipped with the groove (15) for accommodating the support rod (12).
4. a kind of multimedia interactive teaching lectern according to claim 1, which is characterized in that on the slot platform wall of the slot platform Equipped with multiple LED lamp beads (13), multiple LED lamp beads (13) are uniformly distributed on the slot platform wall above handwriting pad (3) and shine The hand-written screen of the bright handwriting pad (3).
5. a kind of multimedia interactive teaching lectern according to claim 1, which is characterized in that the hand of the handwriting pad (3) It writes screen and is given and accepted using electromagnetism and incude screen.
6. a kind of multimedia interactive teaching lectern according to claim 1, which is characterized in that it is described say tables (1) before End is equipped with baffle (14), which is used to limit the turned position of cover board (2).
CN201721487933.3U 2017-11-09 2017-11-09 A kind of multimedia interactive teaching lectern Expired - Fee Related CN208225303U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201721487933.3U CN208225303U (en) 2017-11-09 2017-11-09 A kind of multimedia interactive teaching lectern

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201721487933.3U CN208225303U (en) 2017-11-09 2017-11-09 A kind of multimedia interactive teaching lectern

Publications (1)

Publication Number Publication Date
CN208225303U true CN208225303U (en) 2018-12-11

Family

ID=64532408

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201721487933.3U Expired - Fee Related CN208225303U (en) 2017-11-09 2017-11-09 A kind of multimedia interactive teaching lectern

Country Status (1)

Country Link
CN (1) CN208225303U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112201098A (en) * 2020-11-18 2021-01-08 江苏经贸职业技术学院 Electronic commerce teaching platform

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112201098A (en) * 2020-11-18 2021-01-08 江苏经贸职业技术学院 Electronic commerce teaching platform

Similar Documents

Publication Publication Date Title
CN204066456U (en) Based on the interactive teaching system device of internet
CN206249617U (en) A kind of human resource management instructional device based on cloud platform
CN103680230A (en) Multimedia teaching device
CN204143691U (en) A kind of English teaching board
CN104637357A (en) Cloud computation-based multimedia teaching system and method
CN208225303U (en) A kind of multimedia interactive teaching lectern
CN104464420A (en) Intelligent original handwriting platform system
CN206025608U (en) Computer teaching device
CN201374129Y (en) Electronic teaching blackboard based on general PC, touch screen and projection system
CN206179245U (en) Multimode english teaching device of english teaching
CN205486921U (en) English teaching device
CN202084196U (en) A computer multimedia teaching equipment
CN207199117U (en) A kind of new Business English letter demonstration device
CN201838200U (en) An infrared touch audio-visual instrument
CN202486744U (en) Novel multi-point touch control terminal
CN105894878A (en) A device for multimedia-aided teaching using computer
CN207517216U (en) Writing device
CN106297443A (en) A kind of multi-functional intelligent integrated machine for Multi-media Design teaching
CN205943142U (en) Multimedia english teaching device
CN212112816U (en) Teaching equipment based on computer technology
CN206252084U (en) A kind of special dais of English teaching
CN202394403U (en) Auxiliary multimedia device used in computer teaching
CN205943137U (en) Two -way online interaction classroom teaching apparatus
CN205158685U (en) A multifunctional teaching board for English classroom
CN202062886U (en) Movable-type multilayer combined teaching board

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20181211