CN206644540U - A kind of blackboard for education - Google Patents

Abstract

The utility model provides a kind of blackboard for education, belongs to teaching equipment technical field.It solve existing blackboard for education can not stablize use, and can be produced during blackboard for education use noise or vibration the problem of.This blackboard for education, including framework, blackboard one and blackboard two, blackboard one can horizontally slip along framework, liquid crystal display is fixed with framework, blackboard one is located at the front of liquid crystal display and blackboard one can cover liquid crystal display, and blackboard two is provided with motor, and swing arm is connected with motor, one end of swing arm is be hinged with blackboard two, and motor driving swing arm drives the opposing frame of blackboard two is movable to enable blackboard two to be located at the rear of blackboard one or so that blackboard two flushes with blackboard one.This blackboard for education realize liquid crystal display can be exposed on the premise of, blackboard can stablize use.

Description

A kind of blackboard for education

Technical field

The utility model belongs to teaching equipment technical field, is related to a kind of blackboard for education.

Background technology

With the development of science and technology instruments used for education and equipment there has also been rapid development, liquid crystal display i.e. projecting apparatus, greatly The E-learning equipment such as screen liquid crystal television set, interactive electric whiteboard, existing E-learning equipment in classroom with Locate it is visible, but classroom still be unable to do without blackboard；Existing projecting apparatus majority adapted lifts projection cloth, and general projection cloth is suspended in when putting down Before blackboard, this mode is simple in construction, and original whole blackboard that magnifies is without repacking, but function is few, does not also catch up with information The development in epoch.

Liquid crystal display is then mounted in the inside side, but original blackboard need to make two Xiao Zhang's blackboards one and blackboard two into, wherein black Plate one is placed on the inside and blackboard one is concordant with liquid crystal display, and blackboard second outside can left and right sliding；Either liquid crystal display Device can be mounted among the inside, then original blackboard will make four Xiao Zhangs into, and each Xiao Zhang blackboard in both sides is located at inner side and and liquid crystal display Device is concordant, and middle two Xiao Zhangs outside can left and right sliding；But one, outside blackboard is opened necessarily with that difference of the inside in these structures Distance so that inside and outside blackboard is not located on same plane, have impact on the sight of people's blackboard from the side.

Not latch-up structure, and then exist in outside blackboard between blackboard and slide rail or blackboard and the framework for installing blackboard Support member is not supported to inboard blackboard when left and right slides or after the fixation of inboard blackboard, and usual in the prior art It is that moving forward and backward for inboard blackboard is controlled using spring, and then spring can only be also relied on after inboard blackboard moves into place It is fixed on framework, causes teacher to have noise or vibration in writing on the blackboard so that can not be normally write during teacher's writing on the blackboard.

The content of the invention

The purpose of this utility model is above mentioned problem be present for existing technology, it is proposed that a kind of blackboard for education, this reality It is how on the premise of realization can expose liquid crystal display with new technical problem to be solved, what blackboard can be stablized make With.

The purpose of this utility model can be realized by following technical proposal：

A kind of blackboard for education, including framework, blackboard one and blackboard two, the blackboard one can horizontally slip along framework, described Liquid crystal display is fixed with framework, the blackboard one is located at the front of liquid crystal display and blackboard one can cover liquid crystal display Lid, it is characterised in that the blackboard two is provided with motor, is connected with swing arm on the motor, and the one of the swing arm End is be hinged with blackboard two, and the motor driving swing arm drives the opposing frame of blackboard two is movable blackboard two is located at The rear of blackboard one causes blackboard two to be flushed with blackboard one.

Operation principle：Liquid crystal display can be the existing electricity such as large-screen liquid crystal display television machine or interactive electric whiteboard Sonization teaching equipment；When needing to use liquid crystal display, the opposite side that blackboard one is slid into framework along framework is i.e. existing Blackboard two where position, while motor driving swing arm drives blackboard two to be moved to the rear of blackboard one, closes driving Motor causes blackboard two to stop on the position, and the liquid crystal display for being now initially positioned at the rear of blackboard one exposes；When need not During using liquid crystal display, blackboard one is slid into positioned at the front of liquid crystal display along framework, while motor drives Swing arm drives blackboard two to be moved to, and blackboard two is concordant with blackboard one and closing motor is so that blackboard two is stopped on the position.

Horizontally slipped using blackboard one along framework and blackboard two is by before and after motor and swing arm opposing frame It is mobile so that when that need not use liquid crystal display, blackboard one can keep concordant with blackboard two, be not in the He of blackboard one Difference opens a certain distance between blackboard two, and then does not interfere with the effect of people's blackboard from the side；Controlled using motor black The movement of plate two so that the operation of user is more laborsaving；Pass through motor and the cooperation of swing arm so that whole blackboard two Can be stable be swung by motor driving swing arm along framework is moved forward and backward, while driving electricity is closed after moving into place Machine so that blackboard two is stopped on the position, is located at so as to which either blackboard two is moved to also be moved to concordant with blackboard one The rear of blackboard one can be supported by swing arm, the supporting role of swing arm so that teacher is not in black during writing on the blackboard The noise that sends and vibration when plate two is swung, teacher can normal writing on the blackboard, realize on the premise of can liquid crystal display be exposed, The use that blackboard for education can be stablized.

In above-mentioned blackboard for education, when blackboard two, the usually swing arm is vertically arranged with blackboard two simultaneously with blackboard.

The setting of the structure, when blackboard two is concordant with blackboard one, now teacher is usually to need in blackboard one and blackboard Two enterprising andante books, and be vertically arranged by swing arm with blackboard two, swing arm is not susceptible to roll and displacement, and swing arm is to black Plate two can have a vertical support force, so as to which the pressure energy being subject on blackboard two is all transferred in swing arm, and then can incite somebody to action On the premise of liquid crystal display exposes, blackboard one and the equal use that can be stable of blackboard two.

In above-mentioned blackboard for education, driven wheel is connected with the motor shaft of the motor, is connected in the swing arm There is the toothed disc being meshed with driven wheel and toothed disc can drive swing arm to rotate.

Pass through being used cooperatively for driven wheel and toothed disc so that swing arm can more stablize during swing, simultaneously Also the angle that preferably control swing arm is swung, and then enable blackboard two is stable to be moved forward and backward along framework.

In above-mentioned blackboard for education, several swing spans are provided with the framework, the swing span includes being fixed on frame Connecting rod one on frame and the connecting rod two being fixed on blackboard two, the swing arm are corresponded with swing span and set, the swing arm One end is connected with connecting rod one, and the other end of the swing arm is connected with connecting rod two, and one of them swing arm being connected with motor is led to Respective link one is crossed to be plugged on toothed disc.

One of swing arm can be by connecting rod one and toothed disc and motor connection, and other swing arms are only and connecting rod one Connected with connecting rod two, motor driving driven wheel drives toothed disc to rotate, and toothed disc drives the connecting rod being plugged on toothed disc One is rotated, and now swing arm is swung with the rotation of connecting rod one, and then drives the connecting rod two being connected with swing arm other end to rotate, this When because the swing arm on one of swing span rotates the swing arm on other swing spans can be driven to rotate, can be stably by blackboard two Promote and simultaneously moved forward and backward along framework, add the supporting construction of blackboard two, ensure when blackboard two be moved to it is concordant with blackboard one When, teacher can stablize in the enterprising andante book of blackboard two.

In above-mentioned blackboard for education, the swing span is provided with four, and two of which swing span is located at the upside of blackboard two, Two other swing span is located at the downside of blackboard two.

Four swing spans are located at four edges of blackboard two, and the point progress line where four swing spans can form parallel Quadrangle, the theory of mechanics of quadric chain is employed, when the swing arm on one of swing span is under the driving of motor Swing, the effect of the swing arm can drive remaining three swing spans to swing, and by four-point supporting, further enhancing to blackboard two Support so that teacher in the enterprising andante book of blackboard two, be not in blackboard two movement occur noise and vibration so that it is black What plate can be stablized use.

In above-mentioned blackboard for education, the swing arm is in kidney-shaped, and two rounded spacing holes are offered in the swing arm, Offer buckling groove one on the hole wall of the spacing hole, the side wall of the connecting rod one and side wall of connecting rod two offers and clamping The buckling groove two that groove one is oppositely arranged, axial bond is additionally provided with the swing span, when buckling groove one connects when institute with buckling groove two Axial bond energy is stated to be plugged in buckling groove one and buckling groove two.

Axial bond is the locating part used in conventional key connection mode, the setting of buckling groove one, buckling groove two and axial bond, Swing arm can be realized to connecting rod one and circumferentially positioned, the band that one of them connecting rod one being plugged on toothed disc can be stable of connecting rod two Dynamic corresponding swing arm is swung, and the drivening rod two that swing arm can stablize is swung so that the progress that whole swing process can be stablized, is entered And it ensure that normal, the stable use of blackboard for education.

In above-mentioned blackboard for education, the buckling groove one vertically runs through swing arm, and the buckling groove two is in bar shaped.

The setting of the structure, the connection between connecting rod one and connecting rod two and swing arm is facilitated, while can also realize connecting rod one It is circumferentially positioned in swing arm with connecting rod two.

In above-mentioned blackboard for education, positioning hole is offered on the toothed disc, one of them described swing span is close to drive Dynamic motor is set, and is provided with support and support base in the swing span, and the support base is set on connecting rod one, the energy of connecting rod one In embedded support, this blackboard for education also includes electromagnet, and the electromagnet is provided with locating rod, and the end of the locating rod passes through Support base is fixed in positioning hole.

The setting of the structure, the locating rod of electromagnet can be embedded in after blackboard two moves into place in support base, Jin Ershi Now to the further locking of blackboard two, while power-off condition is occurring, first can take out electromagnet, can be achieved with rotating rotation manually Turn blackboard, and then can not influence the use of blackboard one and blackboard two when having a power failure.

In above-mentioned blackboard for education, the motor is provided with electric machine support, and the driven wheel is arranged on motor branch In frame, in the side insertion electric machine support that the toothed disc engages with driven wheel.

The setting of electric machine support, the running situation of toothed disc and driven wheel can be protected, reduce external impurities and enter tooth At wheel disc and driven wheel, while using the electric machine support of open type, the cleaning to toothed disc and driven wheel has been also convenient for it.

In above-mentioned blackboard for education, the swing span is provided with the bearing block one that can be set on connecting rod one, the axle Bearing one is fixed with framework, and the both ends of the bearing block one convex to form annulus one, and bearing, the axle are provided with the annulus one The lateral wall of the madial wall held and connecting rod one mutually reclines.

The setting of bearing, reduce the friction of connecting rod one and annulus one so that connecting rod one will not be excessive because of rubbing, and shadow Ring the rotation regulation of blackboard two；The setting of bearing block one, connecting rod one can be helped to be connected with framework, while nor affect on swing arm and company Connection between bar one.

In above-mentioned blackboard for education, the swing span is provided with the bearing block two that can be set on connecting rod two, the axle Bearing two is fixed with blackboard two, and the bearing block two convexes to form annulus two, and bearing is provided with the annulus two, the bearing The lateral wall of madial wall and connecting rod two mutually reclines.

The setting of bearing, reduce the friction of connecting rod two and annulus two so that connecting rod two will not be excessive because of rubbing, and shadow Ring the rotation regulation of blackboard two；The setting of bearing block two, help connecting rod two to be connected with blackboard two, while nor affect on swing arm and company Connection between bar two.

Compared with prior art, this blackboard for education has advantages below：

1st, by motor and the cooperation of swing arm, the effect of people's blackboard from the side is not interfered with, while causes religion yet Teacher is being not in the noise that sends and vibration when blackboard two is swung during writing on the blackboard, teacher can normal writing on the blackboard, realize On the premise of can liquid crystal display be exposed, blackboard can stablize use.

2nd, when blackboard two is concordant with blackboard one, the vertical blackboard two of swing arm, it is vertically arranged by swing arm and blackboard two, swing arm It is not susceptible to roll and displacement, swing arm there can be a vertical support force to blackboard two, so as to the pressure being subject on blackboard two Power all can be transferred in swing arm.

3rd, the setting of electromagnet, it can handle when there is situation about having a power failure, electromagnet can be taken out manually, realized to blackboard Two manual unlocking.

Brief description of the drawings

Fig. 1 is the structural representation of this blackboard for education.

Fig. 2 is the part-structure schematic diagram after the installation of blackboard two in this blackboard for education.

Fig. 3 is the fragmentary elevational view of this blackboard for education.

Fig. 4 is along A-A sectional view in Fig. 3.

Fig. 5 is along B-B phantom in Fig. 3.

Fig. 6 is the explosive view of motor in this blackboard for education, driven wheel, toothed disc and swing span.

Fig. 7 is the structural representation of swing arm in this blackboard for education.

In figure, 1, framework；2nd, slide rail；3rd, blackboard one；4th, blackboard two；41st, motor；411st, motor shaft；412nd, drive Wheel；413rd, electric machine support；42nd, swing arm；421st, spacing hole；422nd, buckling groove one；43rd, toothed disc；431st, positioning hole；5th, swing Frame；51st, connecting rod one；52nd, connecting rod two；53rd, buckling groove two；54th, support；55th, support base；56th, bearing block one；561st, annulus one； 57th, bearing block two；571st, annulus two；6th, electromagnet；61st, locating rod；7th, bearing.

Embodiment

It is specific embodiment of the utility model and with reference to accompanying drawing below, the technical solution of the utility model is made further Description, but the utility model is not limited to these embodiments.

As shown in figure 1, this blackboard for education includes framework 1, blackboard 1, blackboard 24 and two slide rails 2 be arrangeding in parallel, two One slide rail 2 is separately positioned on the upper and lower ends of framework 1, and blackboard 1 and blackboard 24 are arranged between two one slide rails 2, blackboard one 3 can be horizontally slipped along slide rail 2, and liquid crystal display is fixed with framework 1, and blackboard 1 is located at the front of liquid crystal display and blackboard One 3 can cover liquid crystal display.

Specifically, as shown in figs. 1-7, blackboard 24 is provided with motor 41, on the motor shaft 411 of motor 41 Driven wheel 412 is connected with, swing arm 42 is also associated with motor 41, is connected with what is be meshed with driven wheel 412 in swing arm 42 Toothed disc 43 and toothed disc 43 can drive swing arm 42 to rotate, is provided with several swing spans 5 in framework 1, swing span 5 is including being fixed on Connecting rod 1 and the connecting rod 2 52 being fixed on blackboard 24 on framework 1, swing arm 42 and swing span 5 correspond setting, swing arm 42 one end is connected with connecting rod 1, and the other end of swing arm 42 is be hinged by connecting rod 2 52 and blackboard 24, one of them and driving The swing arm 42 that motor 41 connects can be plugged on toothed disc 43 by corresponding connecting rod 1, and motor 41 drives the band of swing arm 42 The dynamic opposing frame 1 of blackboard 24 moves forward and backward the rear for enabling blackboard 24 to be located at blackboard 1 or causes blackboard 24 and blackboard One 3 flush, and due to height and the relation of position, one of them, which is plugged on connecting rod 1 on toothed disc 43, includes extension shaft and small Axle, one end of extension shaft are plugged on toothed disc 43, and the other end of extension shaft convexes to form latch, and one end of small axle offers company Hole is connect, latch can be plugged on connecting hole.

Operation principle：When needing to use liquid crystal display, blackboard 1 is slid into the opposite side of framework 1 along framework 1 Position where i.e. existing blackboard 24, while motor 41 drives swing arm 42 to drive blackboard 24 to be moved to blackboard 1 Rear, close motor 41 and blackboard 24 is stopped on the position, be now initially positioned at the liquid crystal at the rear of blackboard 1 Show that device exposes；When liquid crystal display need not be used, blackboard 1 is slid into before liquid crystal display along framework 1 Side, at the same motor 41 drive swing arm 42 drive blackboard 24 be moved to blackboard 24 it is concordant with blackboard 1 and close drive it is electric Machine 41 causes blackboard 24 to stop on the position.

Horizontally slipped using blackboard 1 along framework 1 and blackboard 24 is with respect to frame by motor 41 and swing arm 42 Frame 1 is movable so that when that need not use liquid crystal display, blackboard 1 can keep concordant with blackboard 24, can't go out Existing difference between blackboard 1 and blackboard 24 opens a certain distance, and then does not interfere with the effect of people's blackboard from the side；Using drive Dynamic motor 41 controls the movement of blackboard 24 so that the operation of user is more laborsaving；Pass through motor 41 and swing arm 42 Coordinate so that what whole blackboard 24 can be stable drive swing arm 42 to swing along framework 1 by motor 41 moves forward and backward, together When after moving into place, close motor 41 and blackboard 24 stopped on the position, so as to which either blackboard 24 moves It can be supported to be also moved to concordant with blackboard 1 positioned at the rear of blackboard 1 by swing arm 42, the support of swing arm 42 is made With so that teacher during writing on the blackboard be not in the noise that is sent when blackboard 24 is swung and vibration, teacher can normal plate Book, realize on the premise of can liquid crystal display be exposed, the use that blackboard for education can be stablized.

As shown in figs. 1-7, when blackboard 24 flushes with blackboard 1, swing arm 42 is vertically arranged with blackboard 24, when blackboard 24 Swing arm 42 be arranged in parallel with blackboard 24 during positioned at the rear of blackboard 1.

When blackboard 24 is concordant with blackboard 1, now teacher is usually to need in 24 enterprising andante of blackboard 1 and blackboard Book, and be vertically arranged by swing arm 42 with blackboard 24, swing arm 42 is not susceptible to roll and displacement, and swing arm 42 is to blackboard 24 can have a vertical support force, so as to which the pressure energy being subject on blackboard 24 is all transferred in swing arm 42, and then in energy On the premise of liquid crystal display is exposed, blackboard 1 and the equal use that can be stable of blackboard 24；When blackboard 24 is located at blackboard 1 Rear when, swing arm 42 can be parallel with blackboard 24, on the one hand save blackboard 24 translation space, on the other hand also cause After folding, swing arm 42 be arranged in parallel with blackboard 24 so that and swing arm 42 is not easy to be opened, and then after the translation of blackboard 24 more It is stable.

As shown in Fig. 2 in the present embodiment, swing span 5 is provided with four, and two of which swing span 5 is located at the upper of blackboard 24 Side, two other swing span 5 are located at the downside of blackboard 24.Four swing spans 5 are located at four edges of blackboard 24, four pendulum Point where moving frame 5, which carries out line, can form parallelogram, using the theory of mechanics of quadric chain, be swung when one of In the driving lower swing of motor 41, the effect of the swing arm 42 can drive remaining three swing spans 5 to put for swing arm 42 on frame 5 It is dynamic, by four-point supporting, it further enhancing the support to blackboard 24 so that teacher is in the enterprising andante book of blackboard 24, no Noise and the vibration of the movement generation of blackboard 24 occurs so that what blackboard can be stablized use.

Furtherly, as shown in figs. 1-7, swing arm 42 is in kidney-shaped, and two rounded spacing holes are offered in swing arm 42 421, buckling groove 1 is offered on the hole wall of spacing hole 421, and the side wall of connecting rod 1 and the side wall of connecting rod 2 52 offer The buckling groove 2 53 being oppositely arranged with buckling groove 1, axial bond is additionally provided with swing span 5, when buckling groove 1 and buckling groove Axial direction bond energy is plugged in buckling groove 1 and buckling groove 2 53 during 2 53 connection, and buckling groove 1 vertically runs through swing arm 42, Buckling groove 2 53 is in bar shaped.The setting of buckling groove 1, buckling groove 2 53 and axial bond, swing arm 42 can be realized to connecting rod 1 With circumferentially positioned, the corresponding swing arm of drive that one of them connecting rod 1 being plugged on toothed disc 43 can be stable of connecting rod 2 52 42 are swung, and the drivening rod 2 52 that swing arm 42 can be stable is swung so that the progress that whole swing process can be stablized, and then ensure Normal, the stable use of blackboard for education.

As shown in figs. 1-7, motor 41 is provided with electric machine support 413, and driven wheel 412 is arranged in electric machine support 413, In the side insertion electric machine support 413 that toothed disc 43 engages with driven wheel 412, positioning hole 431 is offered on toothed disc 43, wherein One swing span 5 is set close to motor 41, and is provided with support 54 and support base 55 in the swing span 5, and support base 55 is arranged On connecting rod 1, connecting rod 1 can be embedded in support 54, and this blackboard for education also includes electromagnet 6, and electromagnet 6 is provided with positioning Bar 61, the end of locating rod 61 are fixed in positioning hole 431 through support base 55.

The setting of electric machine support 413, the running situation of toothed disc 43 and driven wheel 412 can be protected, reduces external impurities Enter at toothed disc 43 and driven wheel 412, while using the electric machine support 413 of open type, be also convenient for the He of toothed disc 43 The cleaning of driven wheel 412；And the setting of electromagnet 6 and locating rod 61, can be after blackboard 24 moves into place, by electromagnet 6 Locating rod 61 is embedded in support base 55, and then realizes the further locking to blackboard 24, while power-off condition is occurring, can be first Electromagnet 6 is taken out, can be achieved with rotating Revolving blackboard manually, and then can not influence blackboard 1 and blackboard 24 when having a power failure Use.

As shown in figs. 1-7, swing span 5, which is provided with, can be set in bearing block 1 on connecting rod 1, bearing block 1 with Framework 1 is fixed, and the both ends of bearing block 1 convex to form annulus 1, and bearing 7, the inner side of bearing 7 are provided with annulus 1 The lateral wall of wall and connecting rod 1 mutually reclines, and swing span 5 is provided with the bearing block 2 57 that can be set on connecting rod 2 52, bearing block 2 57 fix with blackboard 24, and bearing block 2 57 convexes to form annulus 2 571, are provided with bearing 7 in annulus 2 571, bearing 7 it is interior Side wall and the lateral wall of connecting rod 2 52 mutually recline.

The setting of bearing 7, reduce the friction of connecting rod 1 and annulus 1 and rubbing for connecting rod 2 52 and annulus 2 571 Wipe so that connecting rod 1 and connecting rod 2 52 will not be because of the rotation regulations that is excessive, and influenceing blackboard 24 that rubs；Bearing block 1 With the setting of bearing block 2 57, the connection of connecting rod 1 and framework 1 and connecting rod 2 52 and framework 1 can be helped, is nor affected on simultaneously Connection between swing arm 42 and connecting rod 1 between swing arm 42 and connecting rod 2 52.

Specific embodiment described herein is only to the utility model spirit explanation for example.The utility model institute Category those skilled in the art can make various modifications or supplement to described specific embodiment or using similar Mode substitute, but without departing from spirit of the present utility model or surmount scope defined in appended claims.

Claims (10)

1. a kind of blackboard for education, including framework (1), blackboard one (3) and blackboard two (4), the blackboard one (3) can be along framework (1) Horizontally slip, be fixed with liquid crystal display on the framework (1), the blackboard one (3) is located at the front of liquid crystal display and black Plate one (3) can cover liquid crystal display, it is characterised in that the blackboard two (4) is provided with motor (41), the driving Swing arm (42) is connected with motor (41), one end of the swing arm (42) is be hinged with blackboard two (4), and the motor (41) is driven Movable pendulum arm (42) drives the movable rear for causing blackboard two (4) to be located at blackboard one (3) of blackboard two (4) opposing frame (1) Or blackboard two (4) is flushed with blackboard one (3).

2. blackboard for education according to claim 1, it is characterised in that described in when blackboard two (4) flushes with blackboard one (3) Swing arm (42) is vertically arranged with blackboard two (4).

3. blackboard for education according to claim 1 or 2, it is characterised in that the motor shaft (411) of the motor (41) On be connected with driven wheel (412), the toothed disc (43) being meshed with driven wheel (412) and gear are connected with the swing arm (42) Disk (43) can drive swing arm (42) to rotate.

4. blackboard for education according to claim 3, it is characterised in that be provided with several swing spans in the framework (1) (5), the swing span (5) includes the connecting rod one (51) being fixed on framework (1) and the connecting rod two being fixed on blackboard two (4) (52), the swing arm (42) is corresponded with swing span (5) and set, and one end of the swing arm (42) is connected with connecting rod one (51), The other end of the swing arm (42) is connected with connecting rod two (52), and one of them swing arm (42) being connected with motor (41) passes through Respective link one (51) is plugged on toothed disc (43).

5. blackboard for education according to claim 4, it is characterised in that the swing span (5) is provided with four, two of which pendulum Moving frame (5) is located at the upside of blackboard two (4), and two other swing span (5) is located at the downside of blackboard two (4).

6. blackboard for education according to claim 4, it is characterised in that the swing arm (42) is in kidney-shaped, the swing arm (42) On offer two rounded spacing holes (421), offer buckling groove one (422), institute on the hole wall of the spacing hole (421) State the side wall of connecting rod one (51) and the side wall of connecting rod two (52) offers the buckling groove two being oppositely arranged with buckling groove one (422) (53) axial bond, is additionally provided with the swing span (5), the axial direction when buckling groove one (422) connects with buckling groove two (53) Bond energy is plugged in buckling groove one (422) and buckling groove two (53).

7. blackboard for education according to claim 6, it is characterised in that the buckling groove one (422) vertically runs through swing arm (42), the buckling groove two (53) is in bar shaped.

8. blackboard for education according to claim 4, it is characterised in that offer positioning hole on the toothed disc (43) (431), one of them described swing span (5) close to motor (41) set, and the swing span (5) in be provided with support (54) and Support base (55), the support base (55) are set on connecting rod one (51), and the connecting rod one (51) can be embedded in support (54), this Blackboard for education also includes electromagnet (6), and the electromagnet (6) is provided with locating rod (61), and the end of the locating rod (61) is worn Support base (55) is crossed to be fixed in positioning hole (431).

9. blackboard for education according to claim 3, it is characterised in that the motor (41) is provided with electric machine support (413), the driven wheel (412) is arranged in electric machine support (413), what the toothed disc (43) was engaged with driven wheel (412) In side insertion electric machine support (413).

10. blackboard for education according to claim 4, it is characterised in that the swing span (5), which is provided with, can be set in connecting rod Bearing block one (56) on one (51), the bearing block one (56) is fixed with framework (1), and the both ends of the bearing block one (56) are convex Rise and form annulus one (561), bearing (7), madial wall and the connecting rod one of the bearing (7) are provided with the annulus one (561) (51) lateral wall mutually reclines.