阅读说明：本技术 一种大学英语教育多媒体教学装置 (College english education multimedia teaching device ) 是由 孔海珍 李文轩 宋育铭 于 2021-08-31 设计创作，主要内容包括：本发明提供一种大学英语教育多媒体教学装置,属于英语教学多媒体课桌技术领域,以解决类似于上述中的英语学习用多媒体学习书桌在使用时,学习桌的多媒体设备置于桌面上,在教室环境下非常容易受到粉笔灰尘污染,多媒体设备不便于清理,同时容易遮挡视线,不便于学生看向前方黑板的问题,包括下桌体；所述上桌板的两侧边固定连接在下桌体的两侧壁上；所述内推框架设有两处,两处内推框架滑动连接在下桌体与上桌板之间；所述多媒体教学屏的摆动轴通过铰接连接在内推框架的末端；可以看出,比现有的英语学习用教学书桌改善了多媒体组件的收纳方式,可以大大降低教室内粉尘对多媒体设备的影响,减小多媒体设备由于粉尘受到破坏的几率。(The invention provides a multimedia teaching device for college English education, which belongs to the technical field of English teaching multimedia desks and aims to solve the problems that when a multimedia learning desk similar to the above multimedia learning desk for English learning is used, multimedia equipment of the learning desk is arranged on a desktop, is very easily polluted by chalk dust under the classroom environment, is inconvenient to clean and shield the sight, and is inconvenient for students to see a front blackboard, and the multimedia teaching device comprises a lower desk body; two side edges of the upper table plate are fixedly connected to two side walls of the lower table body; the inner pushing frame is provided with two positions, and the two positions are connected between the lower table body and the upper table plate in a sliding manner; the swinging shaft of the multimedia teaching screen is hinged with the tail end of the push-in frame; can find out, study with the teaching desk and improve multimedia component's storage mode than current english, dust in can the greatly reduced classroom is to multimedia device's influence, reduces multimedia device because the dust receives the probability of destruction.)

1. A college english education multimedia teaching device, comprising: upper table board (2), its characterized in that: two side edges of the upper table plate (2) are fixedly connected to two side walls of the lower table body (1);

the inner pushing frame (3) is provided with two positions, and the two positions of the inner pushing frame (3) are connected between the lower table body (1) and the upper table plate (2) in a sliding manner;

the device comprises a multimedia teaching screen (4), wherein a swinging shaft (401) of the multimedia teaching screen (4) is connected to the tail end of an inner pushing frame (3) through a hinge, and two ends of the swinging shaft (401) are respectively and fixedly connected with a synchronous driven wheel (4011);

the self-locking transmission component (6) is provided with two positions, and the two self-locking transmission components (6) are rotatably connected to the upper surface of the lower table body (1) through bearings;

the driving piece (7) is fixedly connected to the upper surface of the lower table body (1) through a screw, the output end of the driving piece (7) is connected with and drives the driving worm (8) through a coupler, the driving piece (7) is connected with the driving switch (701) through an electric connecting line, and the driving switch (701) is fixedly connected to the front surface of the lower table body (1);

the driving worm (8) is rotatably connected to the upper surface of the lower table body (1) through a bearing, and the driving worm (8) is in transmission connection with a transmission worm wheel (601) through a worm gear;

the protection bottom cover (9) is connected to the lower surface of the lower table body (1) in a sliding mode, and the protection bottom cover (9) is wrapped outside the multimedia teaching screen (4);

the movable push bar (10) is connected to the rear portion of the middle of the lower surface of the upper table plate (2) in a sliding mode.

2. The multimedia teaching apparatus for college english education defined by claim 1, wherein: the lower table body (1) comprises:

the limiting lug (101), the limiting lug (101) is provided with two positions, and the two limiting lugs (101) are fixedly connected on the upper surface of the lower table body (1) through welding;

the adjusting groove (102), the adjusting groove (102) is equipped with two places, and two adjusting grooves (102) are all seted up on the upper surface of lower table body (1).

3. The multimedia teaching apparatus for college english education defined by claim 2, wherein: the lower table body (1) further comprises:

the guide bottom rail (103) is provided with two positions, the two guide bottom rails (103) are fixedly connected to the lower surface of the lower table body (1), and the guide bottom rails (103) are L-shaped folded plates;

the synchronous idle wheel (104), synchronous idle wheel (104) are equipped with two places, and two synchronous idle wheels (104) all pass through the bearing rotation connection on the upper surface of lower table body (1).

4. The multimedia teaching apparatus for college english education defined by claim 2, wherein: the adjusting groove (102) is a rectangular through groove, and the adjusting groove (102) comprises:

the synchronous wheel (1021) is provided with two positions, and the two positions of the synchronous wheel (1021) are respectively connected in the two adjusting grooves (102) in a rotating way through bearings.

5. The multimedia teaching apparatus for college english education defined by claim 1, wherein: the upper table plate (2) comprises:

lower leading truck (201), lower leading truck (201) are equipped with two sets ofly, and two sets of equal fixed connection of leading truck (201) are in the lower surface rear of last table (2) down, and sliding connection has the activity to push away strip (10) down in leading truck (201).

6. The multimedia teaching apparatus for college english education defined by claim 1, wherein: the push-in frame (3) is a rectangular frame body, and the push-in frame (3) comprises:

the inner synchronous rack (301), the inner synchronous rack (301) is arranged on the outer surface of the inner side frame rod of the inner push frame (3), and the inner synchronous rack (301) is meshed with the synchronous idle wheel (104);

the outer synchronous rack (302) is arranged on the lower surface of an outer frame rod of the inner pushing frame (3), and the outer synchronous rack (302) is meshed with the synchronous wheel (1021);

the hinged end (303), the hinged end (303) is arranged at the rear end of the inner synchronous rack (301).

7. The multimedia teaching apparatus for college english education defined by claim 1, wherein: the self-locking transmission assembly (6) comprises:

transmission worm wheel (601), transmission worm wheel (601) fixed connection is in auto-lock transmission subassembly (6) axis body upper end, and auto-lock transmission subassembly (6) axis body lower extreme fixedly connected with driving gear (602).

8. The multimedia teaching apparatus for college english education defined by claim 1, wherein: the protective bottom cover (9) comprises:

the side pushing rack (901), the side pushing rack (901) is provided with two positions, the two position side pushing racks (901) are respectively and fixedly connected with two side surfaces of the protective bottom cover (9), and tooth surfaces of the two position side pushing racks (901) face downwards.

9. The multimedia teaching apparatus for college english education defined by claim 1, wherein: the activity is pushed away and has been seted up the rectangle inside groove on the bottom surface of strip (10), and the activity pushes away strip (10) including:

the front sliding chute (1001), the front sliding chute (1001) is arranged at the front side of the rectangular inner groove of the movable push bar (10);

the rear driving tooth groove (1002), the rear driving tooth groove (1002) is arranged behind the front sliding groove (1001); and a rack structure is arranged in the rear driving tooth groove (1002).

10. The multimedia teaching apparatus of college english education as claimed in claim 9, wherein: the movable push bar (10) further comprises: the side guide device comprises side guide flanges (1003), the side guide flanges (1003) are provided with two positions, the two side guide flanges (1003) are fixedly connected to the two side surfaces of the movable push bar (10) respectively, and the two side guide flanges (1003) are connected to the inner side of the lower guide frame (201) in a sliding mode.

Technical Field

The invention belongs to the technical field of multimedia desks, and particularly relates to a multimedia teaching device for college English education.

Background

In addition to exercises such as grammar and writing in the study of college English, the combination of application scenes for learning English pronunciation is also very important, and multimedia teaching refers to that in the teaching process, according to the characteristics of a teaching target and a teaching object, modern teaching media are reasonably selected and applied, and are organically combined with the traditional teaching means to jointly participate in the whole teaching process, so that various media information acts on students to form a reasonable teaching process structure, and the optimized teaching effect is achieved; the multimedia teaching device has the advantages that the multimedia classroom provides independent multimedia equipment for each student during English learning, each student can conveniently use the multimedia equipment of the student to carry out English voice or video teaching suitable for the speed and volume of the student, and therefore adjacent students are not interfered with each other.

Based on the description, when the study desk is used, the multimedia equipment of the study desk is arranged on the desktop, is very easily polluted by chalk dust in a classroom environment, is inconvenient to clean, and is also inconvenient for students to see a blackboard in the front because the multimedia equipment easily shields the sight.

Disclosure of Invention

In order to solve the technical problems, the invention provides a multimedia teaching device for college english education, which aims to solve the problems in the background art.

The invention relates to a college English education multimedia teaching device, which is achieved by the following specific technical means:

a college English education multimedia teaching device comprises a lower table body; two side edges of the upper table plate are fixedly connected to two side walls of the lower table body; the inner pushing frame is provided with two positions, and the two positions are connected between the lower table body and the upper table plate in a sliding manner; the swinging shaft of the multimedia teaching screen is connected with the tail end of the inner pushing frame through a hinge, and two ends of the swinging shaft are respectively and fixedly connected with a synchronous driven wheel; the self-locking transmission assembly is provided with two positions, and the two positions of the self-locking transmission assembly are rotatably connected to the upper surface of the lower table body through bearings; the driving piece is fixedly connected to the upper surface of the lower table body through a screw, the output end of the driving piece is connected with and drives the driving worm through the coupler, the driving piece is connected with the driving switch through an electric connecting line, and the driving switch is fixedly connected to the front surface of the lower table body; the driving worm is rotatably connected to the upper surface of the lower table body through a bearing and is in transmission connection with the transmission worm wheel through a worm gear; the protective bottom cover is connected to the lower surface of the lower table body in a sliding mode, and the protective bottom cover wraps the outer portion of the multimedia teaching screen; the movable push bar is connected to the rear part of the middle of the lower surface of the upper table plate in a sliding mode.

Furthermore, the two limiting lugs are fixedly connected to the upper surface of the lower table body through welding; the adjusting groove is provided with two positions, and the two adjusting grooves are arranged on the upper surface of the lower table body.

Furthermore, the guide bottom rail is provided with two positions, the two guide bottom rails are fixedly connected to the lower surface of the lower table body, and the guide bottom rails are L-shaped folded plates; the synchronous idler wheel is provided with two positions, and the two positions of the synchronous idler wheel are rotationally connected on the upper surface of the lower table body through bearings.

Furthermore, the regulating tank is a rectangular through groove and comprises two synchronizing wheels, and the two synchronizing wheels are rotatably connected into the two regulating tanks through bearings respectively.

Further, the lower guide frame is provided with two groups, the two groups of lower guide frames are fixedly connected to the rear portion of the lower surface of the upper table plate, and the lower guide frame is connected with a movable push bar in a sliding mode.

Furthermore, the inner pushing frame is a rectangular frame body and comprises an inner synchronous rack, the inner synchronous rack is arranged on the outer surface of an inner side frame rod of the inner pushing frame, and the inner synchronous rack is meshed with a synchronous idler wheel; the outer synchronous rack is arranged on the lower surface of the outer frame rod of the inner pushing frame and is meshed with the synchronous wheel; the hinged end is arranged at the rear end of the inner synchronous rack.

Furthermore, the transmission worm wheel is fixedly connected to the upper end of the self-locking transmission assembly shaft body, and the lower end of the self-locking transmission assembly shaft body is fixedly connected with the driving gear.

Furthermore, the side pushing racks are provided with two positions, the two side pushing racks are respectively and fixedly connected to two side surfaces of the protective bottom cover, and tooth surfaces of the two side pushing racks face downwards.

Furthermore, a rectangular inner groove is formed in the bottom surface of the movable push bar, and the front sliding groove is formed in the front side of the groove body of the rectangular inner groove of the movable push bar; the rear driving tooth groove is arranged behind the front sliding groove; and a rack structure is arranged in the rear driving tooth groove, two side guide flanges are arranged, the two side guide flanges are respectively and fixedly connected to the two side surfaces of the movable push bar, and the two side guide flanges are connected to the inner side of the lower guide frame in a sliding manner.

Compared with the prior art, the invention has the following beneficial effects:

through the matching of the driving worm and the self-locking transmission assembly, the driving part drives the driving worm to rotate through the coupler, the driving worm rotates to simultaneously drive the two transmission worm wheels on two sides to rotate, the two transmission worm wheels rotate oppositely, the driving gear rotates and drives the synchronous idler wheels to rotate through gear meshing transmission, the synchronous idler wheels on two sides respectively form gear rack transmission with the inner frames of the two groups of inner pushing frames, and the two inner pushing frames are controlled to move backwards simultaneously; in the process, the transmission characteristic of the worm gear and the worm has the characteristic of self-locking, so that the two inward pushing frames cannot return reversely, and the stable positioning of the multimedia teaching screen is ensured.

Through the cooperation of the outer synchronous rack of the structure and the swing shaft, in the process of backward movement of the inner pushing frame, the multimedia teaching screen is pushed to move backward through the swing shaft, and simultaneously, the outer synchronous rack and the synchronous driven wheel are driven to rotate under the meshing action, and the synchronous driven wheel and the side pushing rack form meshing transmission to push the protective bottom cover to move forward.

Through the cooperation of the activity of this structure push away the strip and follow the driving wheel in step, when the frame promotes multimedia teaching screen retrogradation of pushing inwards, synchronous follow driving wheel slides backward in the spout in the front, when removing back initiative tooth groove position, the activity pushes away the strip backward simultaneously under the promotion of synchronous follow driving wheel, stop sliding when the rear limit structure that the activity pushed away the strip blocks, synchronous follow driving wheel and activity push away the strip meshing, the activity pushes away the strip immovably, synchronous follow driving wheel retrogradation and rotates, with multimedia teaching screen rearward swinging, behind the rotatory removal angle, multimedia teaching screen stop motion, thereby realize expandes multimedia teaching screen, connect power and input signal with multimedia teaching screen, can use multimedia teaching screen to carry out english study.

After the use, the driving piece is reversely started through the matching of the protective bottom cover and the multimedia teaching screen, the two groups of inward pushing frames move forwards through a series of transmission in the structure, the protective bottom cover moves backwards, the multimedia teaching screen is folded downwards, so that the multimedia teaching screen smoothly enters the protective bottom cover, the protective bottom cover wraps the multimedia teaching screen, the protection of the multimedia teaching screen is realized, the probability that chalk dust enters the multimedia teaching screen is reduced, and the multimedia teaching equipment is prevented from being polluted and damaged by the dust; can find out, study with the teaching desk and improve multimedia component's storage mode than current english, dust in can the greatly reduced classroom is to multimedia device's influence, reduces multimedia device because the dust receives the probability of destruction.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic structural diagram of the lower table body of the invention.

Fig. 3 is a left-side view structural diagram of the interior of the lower table body.

Fig. 4 is an exploded left view structure diagram of the lower table body of the present invention.

Fig. 5 is a schematic structural diagram of the multimedia teaching screen of the invention after being unfolded.

Fig. 6 is a schematic view of the bottom structure of the multimedia teaching screen of the present invention after being unfolded.

Fig. 7 is a schematic structural view of the protective undercover of the present invention.

Fig. 8 is a schematic structural view of the upper table plate of the invention.

Fig. 9 is a schematic structural diagram of a multimedia teaching screen according to the present invention.

Fig. 10 is a partially enlarged view of a portion a of fig. 5 according to the present invention.

In the drawings, the corresponding relationship between the component names and the reference numbers is as follows:

1. a lower table body; 101. a limiting bump; 102. an adjustment groove; 1021. a synchronizing wheel; 103. a guide bottom rail; 104. a synchronous idler gear; 2. a table board is arranged; 201. a lower guide frame; 3. pushing the frame inwards; 301. an inner synchronous rack; 302. an outer synchronization rack; 303. a hinged end; 4. a multimedia teaching screen; 401. a swing shaft; 4011. a synchronous driven wheel; 6. a self-locking transmission assembly; 601. a drive worm gear; 602. a driving gear; 7. a drive member; 701. a drive switch; 8. a drive worm; 9. a protective undercover; 901. a side-advancing rack; 10. a movable push bar; 1001. a front chute; 1002. a rear driving tooth groove; 1003. side guide flanges.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

as shown in figures 1 to 10:

the invention provides a college English education multimedia teaching device which comprises a lower table body 1, wherein the lower table body 1 comprises a limiting lug 101, the limiting lug 101 is provided with two positions, and the two limiting lugs 101 are fixedly connected to the upper surface of the lower table body 1 through welding; the adjusting groove 102 is provided with two positions, and the two adjusting grooves 102 are both arranged on the upper surface of the lower table body 1; the synchronous idler wheel 104 is provided with two positions, the two positions of the synchronous idler wheel 104 are both connected on the upper surface of the lower table body 1 in a rotating mode through bearings, as shown in fig. 1, the lower table body 1 of the structure is provided with a limiting lug 101 and the synchronous idler wheel 104 which are arranged on the same side, the inner pushing frame 3 is connected between the limiting lug 101 and the synchronous idler wheel 104 in a sliding mode, an inner synchronous rack 301 of the inner pushing frame 3 is meshed with the synchronous idler wheel 104, the limiting lug 101 achieves guiding effect on the inner pushing frame 3 and keeps the inner pushing frame 3 to linearly translate back and forth, the synchronous idler wheel 104 rotates to drive the inner pushing frame 3 to move, the two guiding bottom rails 103 are both fixedly connected on the lower surface of the lower table body 1, the guiding bottom rails 103 are L-shaped folded plates, the protective bottom cover 9 slides on the guiding bottom rails 103 and can translate, and guiding and limiting on the protective bottom cover 9 are achieved through the guiding bottom rails 103; two side edges of the upper table plate 2 are fixedly connected to two side walls of the lower table body 1; the inner pushing frame 3 is provided with two positions, and the two positions of the inner pushing frame 3 are connected between the lower table body 1 and the upper table plate 2 in a sliding way; a swinging shaft 401 of the multimedia teaching screen 4 is connected with the tail end of the inner pushing frame 3 through a hinge, and two ends of the swinging shaft 401 are respectively and fixedly connected with a synchronous driven wheel 4011; the self-locking transmission component 6 is provided with two positions, and the two self-locking transmission components 6 are rotatably connected on the upper surface of the lower table body 1 through bearings; the driving piece 7 is fixedly connected to the upper surface of the lower table body 1 through a screw, the output end of the driving piece 7 is connected with and drives the driving worm 8 through a coupler, the driving piece 7 is connected with the driving switch 701 through an electric connecting line, and the driving switch 701 is fixedly connected to the front surface of the lower table body 1; the driving worm 8 is rotatably connected to the upper surface of the lower table body 1 through a bearing, and the driving worm 8 is in transmission connection with a transmission worm wheel 601 through a worm gear; the protective bottom cover 9 is connected to the lower surface of the lower table body 1 in a sliding mode, and the protective bottom cover 9 is wrapped outside the multimedia teaching screen 4; the movable push bar 10 is connected with the rear part of the middle of the lower surface of the upper table plate 2 in a sliding way.

The adjusting grooves 102 are rectangular through grooves, the synchronizing wheel 1021 is provided with two positions, the two synchronizing wheels 1021 are respectively connected in the two adjusting grooves 102 in a rotating manner through bearings, the synchronizing wheel 1021 of the structure is as shown in fig. 3, the upper part and the lower part of the synchronizing wheel 1021 are simultaneously meshed on the outer synchronizing rack 302 and the side pushing rack 901, and when the inner pushing frame 3 moves under stress, the protective bottom cover 9 below can be pushed to move towards the opposite direction through the reversing effect of the synchronizing wheel 1021.

Wherein, upper table board 2 is equipped with two sets ofly including leading truck 201 down, and two sets of equal fixed connection of leading truck 201 are at upper table board 2's lower surface rear down, and sliding connection has the activity to push away strip 10 in leading truck 201 down, and upper table board 2 of this structure is as shown in figure 8, connects the activity through leading truck 201's effect down and pushes away strip 10, makes the activity push away strip 10 and can slide in leading truck 201 down, plays the guide effect.

The inner pushing frame 3 is a rectangular frame body, the inner pushing frame 3 comprises an inner synchronous rack 301, the inner synchronous rack 301 is arranged on the outer surface of an inner side frame rod of the inner pushing frame 3, and the inner synchronous rack 301 is meshed with the synchronous idle wheel 104; the outer synchronous rack 302 is arranged on the lower surface of the outer frame rod of the inner pushing frame 3, and the outer synchronous rack 302 is meshed with the synchronous wheel 1021; the hinged end 303 is arranged at the rear end position of the inner synchronous rack 301, the inner pushing frame 3 of the structure is shown in fig. 9, the inner pushing frame 3 is in a rectangular structure, the outer synchronous rack 302 and the inner synchronous rack 301 are kept parallel, when the inner pushing frame 3 moves linearly, the outer synchronous rack 302 and the inner synchronous rack 301 move forwards or backwards simultaneously, and then the multimedia teaching screen 4 and the protective bottom cover 9 are pushed to move.

Wherein, auto-lock drive assembly 6 is including transmission worm wheel 601, transmission worm wheel 601 fixed connection is in the upper end of the 6 axis bodies of auto-lock drive assembly, and auto-lock drive assembly 6 axis bodies lower extreme fixedly connected with driving gear 602 of this structure is shown in fig. 10, the transmission worm wheel 601 realizes the worm gear transmission under the effect of initiative worm 8, it rotates to drive transmission worm wheel 601 through initiative worm 8 rotation, middle initiative worm 8 realizes the back drive to the transmission worm wheel 601 of both sides simultaneously, make two department driving gear 602 antiport, drive two synchronous idlers 104 antiport through the gear engagement transmission, realize the syntropy to two sets of push-in frames 3 and promote.

Wherein, a rectangular inner groove is arranged on the bottom surface of the movable push bar 10, and the movable push bar 10 comprises a front sliding groove 1001, the front sliding groove 1001 is arranged at the front side of the groove body of the rectangular inner groove of the movable push bar 10; the rear driving tooth groove 1002 is arranged behind the front sliding groove 1001; a rack structure is arranged in the rear driving tooth groove 1002; the side guide flanges 1003 are provided with two positions, the two side guide flanges 1003 are respectively and fixedly connected to two side surfaces of the movable push bar 10, the two side guide flanges 1003 are slidably connected to the inner side of the lower guide frame 201, the movable push bar 10 of the structure is shown in fig. 8, the outer edge side guide flange 1003 of the movable push bar 10 is slidably connected to the lower guide frame 201, when the pushing-in frame 3 pushes the multimedia teaching screen 4 to move backwards, the synchronous driven wheel 4011 slides backwards in the front sliding groove 1001, and when the synchronous driven wheel moves to the position of the rear driving tooth groove 1002, the movable push bar 10 moves backwards at the same time under the push of the synchronous driven wheel 4011, when the rear limit structure of the movable push bar 10 blocks, the synchronous driven wheel 4011 is engaged with the movable push bar 10, the movable push bar 10 is fixed, the synchronous driven wheel 4011 moves backwards and rotates, the multimedia teaching screen 4 is unfolded to a certain angle and then stops moving, and therefore the multimedia teaching screen 4 is unfolded.

In another embodiment, based on the multimedia teaching device for college english education provided by the first embodiment, the multimedia teaching screen 4 of the device is positioned on the lower surface of the lower table body 1 for storage, and is easily damaged by external factors during the storage process; in order to solve the above problems, with reference to fig. 7, the multimedia teaching device for college english education further includes a protective bottom cover 9, where the protective bottom cover 9 includes a side pushing rack 901, the side pushing rack 901 has two positions, the two side pushing racks 901 are respectively and fixedly connected to two side surfaces of the protective bottom cover 9, and tooth surfaces of the two side pushing racks 901 face downward; the protection under shield 9 is located table body 1 below down, under the normality, when multimedia teaching screen 4 is accomodate, protection under shield 9 is located multimedia teaching screen 4 below, wrap up multimedia teaching screen 4, realize the protection to multimedia teaching screen 4, reduce the probability that chalk dust gets into in multimedia teaching screen 4, avoid polluting and damaging multimedia teaching equipment because the dust, the top and the below of synchronizing wheel 1021 mesh simultaneously on outer synchronous rack 302 and side propulsion rack 901, when the internal pushing frame 3 atress removes, through the switching-over effect of synchronizing wheel 1021, can promote the protection under shield 9 of below and move towards opposite direction, realize taking in the time protecting to multimedia teaching screen 4, multimedia teaching screen 4 expandes and simultaneously the protection under shield 9 withdraws backward.

When in use: firstly, a driving switch 701 is used for controlling the driving of a driving piece 7, the driving piece 7 drives a driving worm 8 to rotate through a coupler, the driving worm 8 simultaneously drives two transmission worm gears 601 on two sides to rotate, the two transmission worm gears 601 rotate oppositely, a driving gear 602 rotates, a synchronous idler 104 is driven to rotate through gear meshing transmission, the synchronous idler 104 on two sides respectively forms gear rack transmission with inner frames of two groups of inner pushing frames 3, the two inner pushing frames 3 are controlled to move backwards simultaneously, in the process of backwards moving the inner pushing frames 3, a multimedia teaching screen 4 is pushed to move backwards through a swinging shaft 401, simultaneously, an outer synchronous rack 302 and a synchronous driven wheel 1 are meshed to drive, the synchronous driven wheel 4011 and a side pushing rack 901 form meshing transmission, a protective bottom cover 9 is pushed to move forwards, therefore, when the multimedia teaching screen 4 moves backwards, the protective bottom cover 9 moves forwards synchronously, so that the multimedia teaching screen 4 can be conveniently unfolded; when the inner pushing frame 3 pushes the multimedia teaching screen 4 to move backwards, the synchronous driven wheel 4011 slides backwards in the front sliding groove 1001, when the synchronous driven wheel 4011 pushes the movable push bar 10 to move backwards at the same time when the synchronous driven wheel 4011 pushes the movable push bar 10 to move to the position of the rear driving tooth groove 1002, the synchronous driven wheel 4011 stops sliding when the rear limiting structure of the movable push bar 10 blocks the movable push bar 10, the movable push bar 10 is fixed, the synchronous driven wheel 4011 moves backwards and rotates, the multimedia teaching screen 4 swings backwards, and after the movable angle is rotated, the multimedia teaching screen 4 stops moving, so that the multimedia teaching screen 4 is unfolded, the multimedia teaching screen 4 is connected with a power supply and an input signal, and the multimedia teaching screen 4 can be used for English learning; after the use is finished, the driving piece 7 is started reversely, the two groups of pushing frames 3 move forwards and the protective bottom cover 9 moves backwards through a series of internal transmission, the multimedia teaching screen 4 is folded downwards, the multimedia teaching screen 4 smoothly enters the protective bottom cover 9, the protective bottom cover 9 wraps the multimedia teaching screen 4, the multimedia teaching screen 4 is protected, the probability that chalk dust enters the multimedia teaching screen 4 is reduced, and the multimedia teaching equipment is prevented from being polluted and damaged by the dust; can find out, study with the teaching desk and improve multimedia component's storage mode than current english, dust in can the greatly reduced classroom is to multimedia device's influence, reduces multimedia device because the dust receives the probability of destruction.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.