CN108340715A

CN108340715A - It is a kind of can be to electronic blackboard that blackboard panel is back and forth wiped

Info

Publication number: CN108340715A
Application number: CN201810087001.2A
Authority: CN
Inventors: 李泽霖
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-01-30
Filing date: 2018-01-30
Publication date: 2018-07-31

Abstract

The present invention provide it is a kind of can be to electronic blackboard that blackboard panel is back and forth wiped, the blackboard eraser of the present invention is when wiping blackboard, the movement locus of routine wiping method is abandoned, and use the similar movement locus for imitating shield glass rain brush, quickly blackboard can be wiped, simultaneously, magnet and electromagnet are provided in blackboard eraser, blackboard eraser is set to be in close contact with blackboard body, to reach best wiping effect, at the end of every class hall, blackboard body can also be wiped by water pump and washing pump, wiping effect is good.

Description

It is a kind of can be to electronic blackboard that blackboard panel is back and forth wiped

Technical field

The invention belongs to educational aid technical fields, and in particular to it is a kind of can be to electronics that blackboard panel is back and forth wiped Blackboard.

Background technology

Blackboard is the main carriers that teacher implements teaching in traditional teaching mode, and teacher is write using chalk on blackboard The content of courses directly wipes blackboard with blackboard eraser after completing explanation.On the one hand this mode will produce a large amount of dust, swim in Environmental pollution is caused in classroom, influences teachers and students' health；On the other hand wiping effect can be weakened by being used for a long time, and consume a large amount of bodies Power, hours of instruction can also be wasted by being wiped during classroom.Along with science and technology development, dust-free chalk, blank, movable blackboard, Multimedia instrument etc. occurs improving teaching in classroom environment, but still can not replace the status of black board teaching, creates a kind of environmental protection Energy saving blackboard wiping has certain researching value, and therefore, the patent of invention of Patent No. CN103231604A discloses one kind Blackboard with automatic dust collection blackboard eraser comprising blackboard body is equipped with horizontal slide rail at the upper and lower edge of the blackboard body, Board wiping device is equipped between the upper and lower horizontal slide rail, the board wiping device includes electric roller brush, Floatable supporting mechanism and set Dust cover outside the electric roller brush, the roller brush shaft are slidably connected to described by the Floatable supporting mechanism On upper and lower horizontal slide rail, the upper end of the roller brush shaft is equipped with decelerating motor, and the dust cover is equipped with control handle, the control Control switch is equipped in handle processed.The lower end of the dust cover is additionally provided with dust collection box, and the lower end of the roller brush shaft is equipped with dust suction wind The lower end of leaf, the dust collection box is equipped with the cloth bag that gathers dust, which is electric roller brush erasing blackboard, has laborsaving time saving and automatic receipts The advantages of dirt, but there is also more disadvantages in actual use by the present invention：First, blackboard eraser again blackboard wiping when, not only need It moves left and right and also needs to move up and down, wiping speed is slower；Second, the defective tightness that blackboard eraser is contacted with blackboard, effect of gathering dust Fruit is bad.

Invention content

That the object of the present invention is to provide a kind of wiping speeds is fast, dust collection effect is good while can be carried out again to blackboard panel past The electronic blackboard wiped again.

In order to achieve the above object, used technical solution of the invention is：One kind can carry out blackboard panel reciprocal The electronic blackboard of wiping, including blackboard body and blackboard eraser, the arranged on left and right sides of the blackboard body is separately provided for will be black The longitudinal section of the fixed seat that plate ontology is fixed on the wall, the fixed seat is in integrally isosceles trapezoid, the bottom edge of the fixed seat It is fixed on the wall, the top margin of the fixed seat is fixedly connected with the blackboard body, and shaft, institute are equipped in the fixed seat The both ends for stating shaft are rotatablely connected by a bearing and the fixed seat respectively, wherein are located on the left of the blackboard body The both ends of the shaft worn in the fixed seat are hinged with left turnover door, the fixed seat being located on the right side of the blackboard body The both ends of interior worn shaft are hinged with right turnover door, are provided with display screen on the left turnover door, on the right turnover door It is provided with touch screen, the upper and lower both sides of the blackboard body are respectively arranged with sliding rail, are located at described on the downside of the blackboard body It is provided with leading screw in sliding rail, the sliding machine that can be slided on two sliding rails, the cunning are installed on two sliding rails Dynamic trolley includes upper slide, the fixed plate hinged with one end of upper slide and is hinged with the one end of fixed plate far from the upper slide Lower skateboard, the bottom end of the top of the upper slide and the lower skateboard is both provided with the movable pulley that can be slided in the sliding rail And the bottom end of the lower skateboard is connected with the leading screw, the leading screw is connected by shaft coupling with servo motor, the servo electricity Machine and the display screen are connected with the output end of controller, and the input terminal of the controller is connected with the touch screen, described Fixed plate is provided with the driving machine for driving blackboard eraser to wipe blackboard body in the side close to the blackboard body Structure, the driving mechanism are connected by telescopic rod with blackboard eraser；

The bottom of the blackboard body is provided with sliding slot, and the bottom end of the sliding slot offers through-hole I, and being equipped in the sliding slot can The mounting bracket slided in the sliding slot is equipped with water pump and washing pump, the water pump and the washing pump on the mounting bracket Entrance box added by connecting pipe and water tank and detergent be respectively connected, the entrance phase with the water pump and the washing pump Connecting pipe even is passed through out of the through-hole I, and the outlet of the water pump and the washing pump passes through connecting pipe and institute respectively Blackboard eraser is stated to be connected.

Preferably, the telescopic rod includes telescopic rod I and telescopic rod II；The driving mechanism includes being mounted on the fixation Driving motor on plate covers in blackboard body and the output shaft of the driving motor described in the output shaft face of the driving motor Equipped with actuating cam, the upper and lower both sides of the actuating cam are respectively arranged with turntable I and turntable II, the turntable I with described turn Disk II is that cylindricality is discoid, and the turntable I is both provided with several gear teeth, institute on the outer circumference surface of both turntables II State actuating cam during rotation respectively by the gear teeth on the turntable I and the turntable II drive the turntable I with The turntable II rotates, and the inside of the turntable I is provided with shaft I along central axial direction, and the inside of the turntable II is in Heart axis direction is provided with shaft II, is arranged with driven wheel I in the shaft II, the underface of the driven wheel I be provided with from The inside of driving wheel II, the driven wheel II is provided with shaft III along central axial direction, is arranged on the outer circumference surface of the shaft I There is telescopic rod I, telescopic rod II, both the telescopic rod I and the telescopic rod II are arranged on the outer circumference surface of the shaft III Telescopic end be hinged on jointly on the blackboard eraser.

Preferably, the blackboard eraser includes shell, and the shell offers through-hole in one end close to the blackboard body II, the shell offers inlet opening and detergent hole in one end far from the blackboard body, the outlet phase with the water pump The connecting pipe of connection is connected with the inlet opening, the connecting pipe being connected with the outlet of the washing pump and the washing Agent hole is connected；

It is horizontally disposed in the shell to have demarcation strip, the demarcation strip that the cavity of the enclosure interior is divided into dust suction Chamber and dust-collecting cavity are provided with the opposite polarity magnet with the blackboard body, the both sides point of the magnet in the vacuum chamber It is not provided with wind turbine, the magnet is being provided with dust-filtering plate, the outside setting of the dust filtration plate close to the side of the through-hole II There are armature and nozzle, wiper is provided on the outside of the dust filtration plate and the nozzle, the shell is positioned at the through-hole II Side is provided with electromagnet, and the armature and the electromagnet are correspondingly arranged and are provided between the armature and the electromagnet Resetting spring, the wind turbine are connected with the output end of the controller with the electromagnet, and the nozzle is in column type and described The both sides of nozzle are respectively arranged with the water pipe and sluicing pipe being connected with the nozzle, the water pipe and the sluicing pipe respectively with The inlet opening is connected with the detergent hole.

Preferably, an adjustment axis is equipped in the magnet, the bottom end of the adjustment axis is mounted on the bottom of the shell, The top of the adjustment axis is connected after being pierced by the top of the shell with an adjusting knob, can be adjusted by twisting adjusting knob The facing area between the magnet and the blackboard body is saved, so as to adjust the blackboard eraser to the blackboard body Adsorption capacity.

Preferably, dust-collecting box, the dust-collecting box and institute are removably provided on the outer wall of the blackboard eraser wherein side Dust-collecting cavity is stated to be connected.

Preferably, it is provided with clump weight in the dust-collecting box.

Preferably, the top of the blackboard body is symmetrical arranged there are two camera, two cameras respectively with institute The input terminal for stating controller is connected, the central axial direction of blackboard body described in the camera shooting equal face in end of two cameras.

Preferably, there are two the display screens, two display screens are connected with the output end of the controller.

Preferably, the top of the blackboard body is provided with propaganda board, is provided on the propaganda board and the controller Output end be connected electronics publicity screen.

Compared with prior art, the beneficial effects of the invention are as follows：The blackboard eraser of the present invention is got rid of when being wiped to blackboard The movement locus of routine wiping method has been abandoned, and has used the similar movement locus for imitating shield glass rain brush, it can be quick Blackboard is wiped, meanwhile, magnet and electromagnet are provided in blackboard eraser, blackboard eraser is enable closely to be connect with blackboard body It touches, to reach best wiping effect, at the end of every class hall, blackboard body can also be carried out by water pump and washing pump Wiping, wiping effect are good.

Description of the drawings

Fig. 1 is the overall structure diagram of the present invention；

Fig. 2 is the schematic diagram of left and right turnover door in the on-state in the present invention；

Fig. 3 is the vertical view of the present invention；

Fig. 4 is the structural schematic diagram of fixed seat in the present invention；

Fig. 5 is the structural schematic diagram of sliding machine in the present invention；

Fig. 6 is the structural schematic diagram of driving mechanism in the present invention；

Fig. 7 is the structural schematic diagram of blackboard eraser in the present invention；

It is marked in figure：1, blackboard body, 2, blackboard eraser, 201, shell, 202, through-hole II, 203, inlet opening, 204, detergent hole, 205, demarcation strip, 206, vacuum chamber, 207, dust-collecting cavity, 208, magnet, 209, wind turbine, 210, dust-filtering plate, 211, armature, 212, spray Head, 213, wiper, 214, electromagnet, 215, water pipe, 216, sluicing pipe, 217, adjustment axis, 218, adjusting knob, 219, reset bullet Spring, 220, dust-collecting box, 221, clump weight, 3, fixed seat, 4, shaft, 5, shaft, 6, left turnover door, 7, right turnover door, 8, display Screen, 9, touch screen, 10, sliding rail, 11, leading screw, 12, sliding machine, 1201, upper slide, 1202, fixed plate, 1203, lower skateboard, 13, servo motor, 14, controller, 15, through-hole I, 16, sliding slot, 17, mounting bracket, 1701, water pump, 1702, washing pump, 1703, Water tank, 1704, detergent add box, 18, driving motor, 19, actuating cam, 20, turntable I, 21, turntable II, 22, shaft I, 23, shaft II, 24, driven wheel I, 25, driven wheel II, 26, shaft III, 27, telescopic rod I, 28, telescopic rod II, 29, camera, 30, propaganda board, 31, electronics publicity screen, 32, the gear teeth.

Specific implementation mode

In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached in the present invention Figure, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is the present invention A part of the embodiment, instead of all the embodiments, based on the embodiments of the present invention, those of ordinary skill in the art are not having The every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.

As depicted in figs. 1 and 2, a kind of can be to the electronic blackboard that blackboard panel is back and forth wiped, including 1 He of blackboard body The arranged on left and right sides of blackboard eraser 2, the blackboard body 1 is separately provided for the fixed seat for being fixed on the wall blackboard body 1 3, as shown in figure 4, the longitudinal section of the fixed seat 3 is in integrally isosceles trapezoid, the bottom edge of the fixed seat 3 is fixed on the wall, The top margin of the fixed seat 3 is fixedly connected with the blackboard body 1, and shaft 4 is equipped in the fixed seat 3, the shaft 4 Both ends are rotatablely connected by a bearing 5 and the fixed seat 3 respectively, wherein are located at the described solid of 1 left side of the blackboard body The both ends of the shaft 5 worn in reservation 3 are hinged with left turnover door 6, are located at the fixed seat 3 on 1 right side of the blackboard body The both ends of interior worn shaft 5 are hinged with right turnover door 7, and display screen 8, the right overturning are provided on the left turnover door 6 It is provided with touch screen 9 on door 7, the upper and lower both sides of the blackboard body 1 are respectively arranged with sliding rail 10, are located at the blackboard body 1 Leading screw 11 is provided in the sliding rail 10 of downside, being equipped on two sliding rails 10 can slide on two sliding rails 10 Sliding machine 12, as shown in figure 5, the sliding machine 12 includes upper slide 1201, the fixation hinged with one end of upper slide Plate 1202 and the lower skateboard 1203 hinged with the one end of fixed plate far from the upper slide, the top of the upper slide 1201 and institute The bottom end for stating lower skateboard 1203 is both provided with the movable pulley 1204 that can be slided in the sliding rail 10 and the lower skateboard 1203 Bottom end is connected with the leading screw 11, and the leading screw 11 is connected by shaft coupling with servo motor 13, the servo motor 13 and institute It states display screen 8 to be connected with the output end of controller 14, the input terminal of the controller 14 is connected with the touch screen 9, described Fixed plate 1202 is provided with close to the side of the blackboard body 1 for driving blackboard eraser 2 to wipe blackboard body 1 Driving mechanism, the driving mechanism are connected by telescopic rod with blackboard eraser 2；

The bottom of the blackboard body 1 is provided with sliding slot 16, and the bottom end of the sliding slot 16 offers through-hole I 15, the sliding slot 16 The mounting bracket 17 that can be slided in the sliding slot 16 is inside installed, water pump 1701 and washing pump are installed on the mounting bracket 17 1702, the entrance of the water pump 1701 and the washing pump 1702 passes through connecting pipe respectively to be added with water tank 1703 and detergent Box 1704 is connected, and the connecting pipe being connected with the entrance of the water pump 1701 and the washing pump 1702 is from the through-hole I 1601 It inside passes through, the outlet of the water pump 1701 and the washing pump 1702 is connected by connecting pipe with the blackboard eraser 2 respectively.

This programme is advanced optimized, the telescopic rod includes telescopic rod I 27 and telescopic rod II 28；The driving mechanism includes Driving motor 18 in the fixed plate 1202, blackboard body 1 described in the output shaft face of the driving motor 18 and Actuating cam 19 is arranged on the output shaft of the driving motor 18, the upper and lower both sides of the actuating cam 19 are respectively arranged with Turntable I 20 and turntable II 21, the turntable I 20 are that cylindricality is discoid with the turntable II 21, the turntable I 20 with described turn Several gear teeth 32 are both provided on the outer circumference surface of both disks II 21, the actuating cam 19 leads to respectively during rotation Cross the turntable I 20 drives the turntable I 20 to be rotated with the turntable II 21 with the gear teeth 32 on the turntable II 21, described turn The inside of disk I 20 is provided with shaft I 22 along central axial direction, and the inside of the turntable II 21 is provided with along central axial direction Shaft II 23 is arranged with driven wheel I 24 in the shaft II 23, and the underface of the driven wheel I 24 is provided with driven wheel II 25, The inside of the driven wheel II 25 is provided with shaft III 26 along central axial direction, is arranged on the outer circumference surface of the shaft I 22 There is telescopic rod I 27, telescopic rod II 28 is arranged on the outer circumference surface of the shaft III 26, the telescopic rod I 27 stretches with described The telescopic end of both bars II 28 is hinged on jointly on the blackboard eraser 2.

This programme is advanced optimized, as shown in fig. 7, the blackboard eraser 2 includes shell 201, the shell 201 is close to institute The one end for stating blackboard body 1 offers through-hole II 202, the shell 201 one end far from the blackboard body 1 offer into Water hole 203 and detergent hole 204, the connecting pipe being connected with the outlet of the water pump 1701 are connected with the inlet opening 203 Logical, the connecting pipe being connected with the outlet of the washing pump 1702 is connected with the detergent hole 204；

Horizontally disposed in the shell 201 to have a demarcation strip 205, the demarcation strip 205 is by the sky inside the shell 201 Chamber is divided into vacuum chamber 206 and dust-collecting cavity 207, is provided in the vacuum chamber 206 opposite polarity with the blackboard body 1 The both sides of magnet 208, the magnet 208 are respectively arranged with wind turbine 209, and the magnet 208 is close to the one of the through-hole II 202 Side is provided with dust-filtering plate 210, and the outside of the dust filtration plate 210 is provided with armature 211 and nozzle 212, the dust filtration plate 210 and institute The outside for stating nozzle 212 is provided with wiper 213, and the shell 201 is being provided with electromagnet positioned at the side of the through-hole II 202 214, the armature 211 and the electromagnet 214 are correspondingly arranged and are provided between the armature 211 and the electromagnet 214 Resetting spring 219, the wind turbine 209 are connected with the output end of the controller 14 with the electromagnet 214, the nozzle 212 are respectively arranged with the water pipe 215 and sluicing pipe being connected with the nozzle 212 in the both sides of column type and the nozzle 212 216, the water pipe 215 and the sluicing pipe 216 are connected with the inlet opening 203 and the detergent hole 204 respectively.

This programme is advanced optimized, an adjustment axis 217, the bottom end peace of the adjustment axis 217 are equipped in the magnet 208 Mounted in the bottom of the shell 201, the top of the adjustment axis 217 is pierced by rear adjusted with one from the top of the shell 201 and revolves Button 218 is connected, and the right opposite between the magnet 208 and the blackboard body 1 can be adjusted by twisting adjusting knob 218 Product, so as to adjust adsorption capacity of the blackboard eraser 2 to the blackboard body 1.

This programme is advanced optimized, dust-collecting box 220 is removably provided on the outer wall of the wherein side of the blackboard eraser 2, The dust-collecting box 220 is connected with the dust-collecting cavity 207.

This programme is advanced optimized, clump weight 221 is provided in the dust-collecting box 220, the presence of clump weight so that this is black When in use, the side for being provided with dust-collecting box 220 is in opposite lower section to blackboard eraser ontology always, reaches best dust accumulation effect.

This programme is advanced optimized, as shown in figure 3, the top of the blackboard body 1 is symmetrical arranged there are two camera 29, Two cameras 29 are connected with the input terminal of the controller 14 respectively, the equal face in camera shooting end of two cameras 29 The central axial direction of the blackboard body 1, there are two the display screens 8, two display screens 8 with the controller 14 Output end be connected, herein, when teacher writes writing on the blackboard, two cameras blackboard body can be carried out videorama and in real time on It reaches in two display screens, it is therefore prevented that the teacher's covering of body to blackboard body when writing writing on the blackboard.

This programme is advanced optimized, the top of the blackboard body 1 is provided with propaganda board 30, is arranged on the propaganda board 30 There is the electronics publicity screen 31 that the output end with the controller 14 is connected, some pursuing a goal with determination property can be uploaded on electronics publicity screen Language, such as：" studying well and making progress every day ", and it is red that a width five-pointed star can be loaded between " studying hard " and " making progress every day " Flag, highly to restore the arrangement in existing classroom.

The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one The widest range caused.

Claims

1. a kind of can be to the electronic blackboard that blackboard panel is back and forth wiped, including blackboard body and blackboard eraser, it is characterised in that： The arranged on left and right sides of the blackboard body is separately provided for the fixed seat for being fixed on the wall blackboard body, the fixation The longitudinal section of seat is in integrally isosceles trapezoid, and the bottom edge of the fixed seat is fixed on the wall, the top margin of the fixed seat with it is described Blackboard body is fixedly connected, and is equipped with shaft in the fixed seat, the both ends of the shaft respectively by a bearing with it is described Fixed seat is rotatablely connected, wherein the both ends of the shaft worn in the fixed seat on the left of the blackboard body and a left side Turnover door is hinged, the both ends of the shaft worn in the fixed seat on the right side of the blackboard body and right overturning door hinge Connect, display screen be provided on the left turnover door, be provided with touch screen on the right turnover door, the blackboard body it is upper and lower Both sides are respectively arranged with sliding rail, are provided with leading screw in the sliding rail on the downside of the blackboard body, on two sliding rails The sliding machine that can be slided on two sliding rails is installed, the sliding machine includes upper slide, one end with upper slide Hinged fixed plate and the lower skateboard hinged with the one end of fixed plate far from the upper slide, the top of the upper slide and described The bottom end of lower skateboard is both provided with the movable pulley that can be slided in the sliding rail and the bottom end of the lower skateboard and the leading screw phase Even, the leading screw is connected by shaft coupling with servo motor, the servo motor and the display screen with the output of controller End is connected, and the input terminal of the controller is connected with the touch screen, and the fixed plate is close to the side of the blackboard body It is provided with the driving mechanism for driving blackboard eraser to wipe blackboard body, the driving mechanism passes through telescopic rod and blackboard It wipes and is connected；

The bottom of the blackboard body is provided with sliding slot, and the bottom end of the sliding slot offers through-hole I, and being equipped in the sliding slot can The mounting bracket slided in the sliding slot is equipped with water pump and washing pump, the water pump and the washing pump on the mounting bracket Entrance box added by connecting pipe and water tank and detergent be respectively connected, the entrance phase with the water pump and the washing pump Connecting pipe even is passed through out of the through-hole I, and the outlet of the water pump and the washing pump passes through connecting pipe and institute respectively Blackboard eraser is stated to be connected；

The telescopic rod includes telescopic rod I and telescopic rod II；The driving mechanism includes the driving being mounted in the fixed plate Motor is arranged in blackboard body and the output shaft of the driving motor described in the output shaft face of the driving motor actively convex The upper and lower both sides of wheel, the actuating cam are respectively arranged with turntable I and turntable II, and the turntable I and the turntable II are column Shape is discoid, and the turntable I is both provided with several gear teeth, the actuating cam on the outer circumference surface of both turntables II During rotation the turntable I and the turntable II are driven by the gear teeth on the turntable I and the turntable II respectively Rotation, the inside of the turntable I are provided with shaft I along central axial direction, and the inside of the turntable II is along central axial direction It is provided with shaft II, driven wheel I is arranged in the shaft II, the underface of the driven wheel I is provided with driven wheel II, described The inside of driven wheel II is provided with shaft III along central axial direction, and telescopic rod I is arranged on the outer circumference surface of the shaft I, Telescopic rod II is arranged on the outer circumference surface of the shaft III, the telescopic rod I and the telescopic end of both telescopic rods II are total It is same to be hinged on the blackboard eraser.

2. it is according to claim 1 it is a kind of can be to electronic blackboard that blackboard panel is back and forth wiped, it is characterised in that：Institute It includes shell to state blackboard eraser, and the shell offers through-hole II in one end close to the blackboard body, and the shell is separate One end of the blackboard body offers inlet opening and detergent hole, the connecting pipe being connected with the outlet of the water pump and institute It states inlet opening to be connected, the connecting pipe being connected with the outlet of the washing pump is connected with the detergent hole；

3. it is according to claim 2 it is a kind of can be to electronic blackboard that blackboard panel is back and forth wiped, it is characterised in that：Institute It states and is equipped with an adjustment axis in magnet, the bottom end of the adjustment axis is mounted on the bottom of the shell, the top of the adjustment axis Be connected with an adjusting knob after being pierced by the top of the shell, by twisting adjusting knob can adjust the magnet with it is described Facing area between blackboard body, so as to adjust adsorption capacity of the blackboard eraser to the blackboard body.

4. it is according to claim 2 it is a kind of can be to electronic blackboard that blackboard panel is back and forth wiped, it is characterised in that：Institute It states and is removably provided with dust-collecting box on the outer wall of blackboard eraser wherein side, the dust-collecting box is connected with the dust-collecting cavity.

5. it is according to claim 4 it is a kind of can be to electronic blackboard that blackboard panel is back and forth wiped, it is characterised in that：Institute It states and is provided with clump weight in dust-collecting box.

6. it is according to claim 1 it is a kind of can be to electronic blackboard that blackboard panel is back and forth wiped, it is characterised in that：Institute The top for stating blackboard body is symmetrical arranged there are two camera, two cameras respectively with the input terminal phase of the controller Even, the central axial direction of blackboard body described in the camera shooting equal face in end of two cameras.

7. it is according to claim 1 it is a kind of can be to electronic blackboard that blackboard panel is back and forth wiped, it is characterised in that：Institute It states there are two display screens, two display screens are connected with the output end of the controller.

8. it is according to claim 1 it is a kind of can be to electronic blackboard that blackboard panel is back and forth wiped, it is characterised in that：Institute The top for stating blackboard body is provided with propaganda board, and the electricity being connected with the output end of the controller is provided on the propaganda board Son publicity screen.