CN213108794U - Teaching blackboard capable of automatically erasing chalk characters and storing dust - Google Patents

Abstract

The utility model relates to an automatic erase chalk character and accomodate teaching blackboard of dust, become the rail system including the blackboard, erase the system, dust collection system. A motor of the rail transfer system drives a gear to rotate, and drives the first guide rail and the first blackboard to move longitudinally through a rack, so that rail transfer is realized; the erasing system comprises a small supporting seat and an erasing roller; the dust collecting system comprises a scraping blade, a transmission motor, a conveyor belt and a collecting box, wherein when the erasing roller rotates, the scraping blade can clean dust on the scraping blade, the conveyor belt is arranged below the scraping blade, and the collecting box is arranged at the tail end of the conveyor belt. The guide rail can move longitudinally under the drive of the rail-changing motor, so that the two blackboards are positioned on different vertical planes, the front blackboard is horizontally moved, the blackboard back erasing device sweeps the rear blackboard and erases, and the erased dust enters the collecting box later. The length of the erasing roller is approximately equal to the width of the blackboard, the erasing can be rapidly completed, and dust is clamped between the two blackboards, so that the flying is greatly reduced.

Description

Teaching blackboard capable of automatically erasing chalk characters and storing dust

Technical Field

The utility model relates to a teaching blackboard specifically is an automatic erase chalk character and accomodate teaching blackboard of dust.

Background

Since the invention of the blackboard, the development and improvement of the blackboard are carried out all the time from the first simple brushing of a layer of black paint on a wood board to the water-milled glass board to the present composite panel and the white board used in a few places, but the style of the blackboard is not changed, the working mode of the blackboard is not changed, most of the changers change the materials and accessories, although the improvement is improved in some aspects, the two defects of the current blackboard still cannot be changed, the existing blackboard does not have the function of automatic erasing, and is generally erased manually by teachers or students, so that the efficiency is low, time and labor are wasted; the second blackboard generates a large amount of dust in the erasing process, which affects the teaching atmosphere in class and harms the health of teachers and students.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides an automatic erase chalk character and accomodate teaching blackboard of dust.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides an automatic erase chalk character and accomodate teaching blackboard of dust, includes first blackboard and second blackboard, still includes three functional module: the blackboard becomes rail system, erases system, dust collection system.

The teaching blackboard capable of automatically erasing chalk characters and containing dust comprises a first support seat, a second support seat, a first guide rail, a second guide rail, a track changing gear, a track changing rack and a track changing motor, wherein the first blackboard and the second blackboard can move in a reciprocating mode in the first guide rail and the second guide rail, the first support seat and the second support seat are integrally of a transverse groove type, longitudinal grooves are formed in two ends of the first support seat and are used as fixed guide rails, a rectangular through hole is formed in the middle of the first support seat, the first guide rail and the second guide rail are connected in the fixed guide rails, at least 2 mutually-noninterfered tracks are arranged on the upper surfaces of the first guide rail and the second guide rail, the width of the first support seat and the width of the second support seat are at least equal to the width of 4 tracks, longitudinal small wheels are arranged at two ends of the bottom of the first guide rail and the second guide rail and can move longitudinally along the longitudinal grooves, the track changing rack is arranged in the middle of the back of, the rail transfer gear penetrates through the rectangular through hole to be meshed with the rail transfer rack, the first guide rail is driven to longitudinally move along the longitudinal groove, the first blackboard on the first guide rail is driven to move together, and the rail transfer function is achieved.

The teaching blackboard capable of automatically erasing chalk characters and containing dust comprises a supporting small seat and an erasing device, wherein the two ends of the back of the first blackboard and the back of the second blackboard are respectively connected with the supporting small seat, the supporting small seats are connected with supporting shafts, and the erasing device is connected onto the supporting shafts.

According to the teaching blackboard capable of automatically erasing chalk characters and containing dust, the dust collecting system is a collecting box and is connected to the lower portion of the back erasing device of the first blackboard and the back erasing device of the second blackboard.

According to the teaching blackboard capable of automatically erasing chalk characters and containing dust, the supporting small seat is provided with the rotatable supporting shaft, the erasing device is an erasing roller, the dust collecting system comprises the scraping blade, an erasing roller conveyor belt, a transmission conveyor belt, a dust collecting conveyor belt, a bevel gear set, a transmission rotating shaft, a driven rotating shaft, a transmission motor and a collecting box, the scraping blade is hinged to the supporting small seat and is in contact with the erasing roller, and the erasing roller is driven by the output shaft of the transmission motor through the erasing roller conveyor belt; the end connection conical gear group of drive motor output shaft, the transmission pivot is connected and is collected the box top, and conical gear group's output shaft drives the motion of transmission pivot through the transmission conveyer belt, and the transmission pivot is collected the conveyer belt through the dust and is driven the motion of pivot, collects the box height and slightly is less than the conveyer belt for collect the dust.

The teaching blackboard capable of automatically erasing chalk characters and containing dust is characterized in that the first supporting seat and the second supporting seat are connected onto a wall body through screws, and the whole blackboard device is supported.

The teaching blackboard capable of automatically erasing chalk characters and containing dust is characterized in that the two ends of the bottoms of the first blackboard and the second blackboard are connected with rollers, and the rollers can roll in the first guide rail and the second guide rail.

According to the teaching blackboard capable of automatically erasing chalk characters and containing dust, the supporting shaft is in interference fit with the erasing roller.

The teaching blackboard capable of automatically erasing chalk characters and containing dust is characterized in that 3 mutually-noninterference tracks are arranged on the upper surfaces of the first guide rail and the second guide rail, and the widths of the first supporting seat and the second supporting seat are equal to the width of 5 tracks.

The teaching blackboard capable of automatically erasing chalk characters and containing dust further comprises a single chip microcomputer, and the single chip microcomputer controls forward rotation, reverse rotation and rotation paths of the motor.

Compared with the prior art, the beneficial effects of the utility model are that:

1. through the use of the first guide rail and the upper blackboard roller, the blackboard eraser can move in the horizontal direction and the longitudinal direction, and the longitudinal movement can be driven by the rail-changing motor due to the rail-changing rack, so that the overall erasing equipment greatly reduces the erasing time, improves the efficiency and saves the class time.

2. The power of the erasing system and the dust collecting system is driven by the transmission motor, so that the weight and the cost of the whole teaching blackboard are reduced.

3. The erasing process is carried out on the back of the front blackboard and the front of the rear blackboard, the whole erasing process is sealed by the plane of the blackboard, dust is difficult to float out and cannot enter a classroom, the dust pollution in the classroom is reduced, and the health hazard of the dust to teachers and students is reduced.

4. Due to the design of the scraping blade, the conveying belt and the collecting box, the manual cleaning and erasing device is avoided, dust is automatically collected in the collecting box, the workload of aunt cleaning is reduced to a great extent, and the labor force is saved.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic front view of the overall structure of the present invention;

FIG. 3 is a schematic bottom view of the overall structure of the present invention;

FIG. 4 is a sectional view of the inner structure of the first blackboard;

FIG. 5 is an enlarged fragmentary view of the bevel gear set at A of FIG. 4;

FIG. 6 is an enlarged, fragmentary view of the bevel gear set at A of FIG. 4 from another perspective;

FIG. 7 is an enlarged view of a portion of FIG. 4 at B;

FIG. 8 is an enlarged view of a portion of FIG. 2 at C;

FIG. 9 is an enlarged view of a portion of FIG. 2 from another viewing angle C;

fig. 10 is an assembly view of the first support base and the first guide rail according to the present invention.

In the figure: 1-a first blackboard, 2-a first guide rail, 3-a first supporting seat, 4-an erasing roller, 5-a scraping blade, 601-an erasing roller conveyor belt, 602-a transmission conveyor belt, 603-a dust collection conveyor belt, 7-a collection box, 8-a rear rail, 9-a middle rail, 10-a front rail, 11-a longitudinal small wheel, 12-a fixed guide rail, 13-a rack, 14-a gear, 15-a rectangular through hole, 16-a control panel, 1601-a track changing motor, 17-a transmission motor, 18-a transmission rotating shaft, 19 and a bevel gear set.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Example 1

The utility model provides an automatic erase chalk character and accomodate teaching blackboard of dust, includes first blackboard 1 and second blackboard, still includes three functional module: the blackboard becomes rail system, erases system, dust collection system.

The teaching blackboard capable of automatically erasing chalk characters and containing dust comprises a first support seat 3, a second support seat, a first guide rail 2, a second guide rail, a track changing gear 14, a track changing rack 13 and a track changing motor 1601, wherein the first blackboard 1 and the second blackboard can move in a reciprocating mode in the first guide rail 2 and the second guide rail, the first support seat 3 and the second support seat are integrally of a transverse groove type, longitudinal grooves are formed in two ends of the first support seat and are used as fixed guide rails 12, a rectangular through hole 15 is formed in the middle of the first support seat 3, the first guide rail 2 and the second guide rail are connected in the fixed guide rails 12, at least 2 mutually non-interference tracks are arranged on the upper surfaces of the first guide rail 2 and the second guide rail, the width of the first support seat 3 and the width of the second support seat at least equals to the width of 4 tracks, longitudinal small wheels 11 are arranged at two ends of the bottom of the first guide rail 2 and the second guide rail and can move longitudinally along the longitudinal grooves, the middle of the back of the first guide rail 2 is provided with a rail-changing rack 13, and a rail-changing gear 14 passes through the rectangular through hole 15 to be meshed with the rail-changing rack 13, so that the first guide rail 2 is driven to longitudinally move along the longitudinal groove, and the first blackboard 1 on the first guide rail is driven to move together, thereby realizing the rail-changing function. The sum of the lengths of the first guide rail and the second guide rail is adapted to the length of the whole blackboard.

It should be noted that the teaching blackboard can be designed into a single track-changing system, that is, only the first blackboard 1 or the second blackboard can be changed in track, and the application mainly takes the example that the first blackboard 1 can be changed in track. The dual orbital transfer system can also be designed, namely the first blackboard and the second blackboard are completely the same and can be orbital transferred, but the complexity of the procedure is increased, and the cost is also increased.

Example 2

Based on embodiment 1, embodiment 2 further limits the erasing device, and the erasing system of the teaching blackboard capable of automatically erasing chalk characters and containing dust comprises a small supporting seat and an erasing device, wherein the small supporting seat is respectively connected to two ends of the back of the first blackboard 1 and the back of the second blackboard, a supporting shaft is connected to the small supporting seat, and the erasing device is connected to the supporting shaft. The dust collecting system is a collecting box 7 and is connected below the first blackboard 1 and the second blackboard back erasing device.

Preferably, a rotatable supporting shaft is installed on the supporting small seat, the erasing device is an erasing roller 4, and an erasing motor is connected to the supporting small seat. The scraping blade 5 is hinged to the small supporting seat and is in contact with the erasing roller 4, the erasing roller 4 is driven by an output shaft of the erasing motor, and dust on the erasing roller 4 is scraped and falls into the collecting box 7. Compared with embodiment 3, the embodiment has a simpler overall structure and saves cost.

Example 3

Based on embodiment 1, unlike embodiment 2, embodiment 3 makes another limitation to the erasing system.

The teaching blackboard capable of automatically erasing chalk characters and containing dust is characterized in that the erasing system comprises a supporting small seat and an erasing device, two ends of the back of the first blackboard 1 and two ends of the back of the second blackboard are respectively connected with the supporting small seat, a rotatable supporting shaft is mounted on the supporting small seat, and the erasing device is an erasing roller 4. The dust collecting system is a collecting box 7 and is connected below the first blackboard 1 and the second blackboard back erasing device.

The dust collecting system comprises a scraping blade 5, an erasing roller conveyor belt 601, a transmission conveyor belt 602, a dust collecting conveyor belt 603, a bevel gear set 19, a transmission rotating shaft 18, a driven rotating shaft, a transmission motor 17 and a collecting box 7, wherein the scraping blade 5 is hinged on the small support base and is in contact with an erasing roller 4, and the erasing roller 4 is driven by an output shaft of the transmission motor 17 through the erasing roller conveyor belt 601; the end of the output shaft of the transmission motor is connected with a bevel gear set 19, the transmission rotating shaft 18 is connected above the collecting box 7, the output shaft of the bevel gear set 19 drives the transmission rotating shaft 18 to move through a transmission conveying belt 602, and the transmission rotating shaft 18 drives the driven rotating shaft to move through a dust collecting conveying belt 603. The height of the collecting box 7 is slightly lower than that of the dust collecting conveyor belt 603, the collecting box 7 is used for collecting dust, and the collecting box 7 is connected to the back faces of the first blackboard 1 and the second blackboard in a sliding mode and can adopt a guide rail matching mode. The side edges of the first blackboard 1 and the second blackboard are provided with small openings for cleaning personnel to pull out.

The erasing roller 4 is positioned by a vertical roller, the roller is arranged on the small supporting seat, a large amount of erasing materials are attached to the roller, the outer side of the erasing materials is in contact with the scraping blade 5, the erasing materials erase notes on the blackboard, and the scraping blade 5 cleans dust on the erasing materials. The blackboard is pulled, and the erasing roller is erased through the plane of the other blackboard, so that the purpose of erasing handwriting is achieved. It should be noted that, the track-changing motor is started to change the track, so that the blackboard which needs to be cleaned of dust is behind, and after the track-changing is completed, the blackboard needs to be manually pulled to cover another blackboard, so as to complete the cleaning work.

The dust collection system can be started when the dust collection system is erased or started after the dust collection system is erased, and preferably, the dust collection system is started after the dust collection system is erased, so that the flying of dust in the erasing process can be reduced. When the wiping is finished, the driving motor 17 is started, the wiping roller 4 starts to rotate slowly, the dust is scraped by the scraping blade 5 and falls onto the dust collecting conveyor 603, and meanwhile, the dust collecting conveyor 603 starts to work under the driving of the same motor, and the dust falling on the dust collecting conveyor is conveyed into the collecting box 7 at the tail end.

Compared with embodiment 2, the added structure of the embodiment can collect dust at the bottom of the whole blackboard into a small collecting box at the tail end, and is easier to clean.

Example 4

Example 4 lists several preferred features, and the above examples may select one or more features to be adapted to it, thereby forming a number of new and different solutions.

Preferably, the first support seat 3 and the second support seat are connected to the wall through screws, and the whole blackboard device is supported.

Preferably, the teaching blackboard capable of automatically erasing chalk characters and containing dust is characterized in that the two ends of the bottoms of the first blackboard 1 and the second blackboard are connected with rollers which can roll in the first guide rail and the second guide rail.

Preferably, the support shaft is in interference fit with the erasing roller 4.

Preferably, in the teaching blackboard capable of automatically erasing chalk characters and containing dust, the upper surfaces of the first guide rail 2 and the second guide rail are provided with 3 rails which do not interfere with each other, and the widths of the first supporting seat 3 and the second supporting seat are equal to the width of 5 rails.

Preferably, in the teaching blackboard for automatically erasing chalk characters and containing dust, the length of the erasing roller 4 is equal to the width of the blackboard ± 0-1 cm.

Preferably, the teaching blackboard capable of automatically erasing chalk characters and containing dust further comprises a single chip microcomputer, and the single chip microcomputer controls forward rotation, reverse rotation and rotation paths of the track transfer motor 1601. It can be designed that the switch is pressed once, and the track-changing motor 1601 drives the first guide rail to move one track.

Example 5

The embodiment of the utility model provides an in, an automatic erase chalk character and accomodate teaching blackboard of dust, including first supporting seat 3 and second supporting seat, first supporting seat 3 and second supporting seat pass through the bolt fastening on the wall body, 3 mid portions of first supporting seat open there is rectangle through-hole 15, and open at both ends has longitudinal groove, is to make fixed guide 12, first guide rail 2 installs in 3 tops of first supporting seat, and its body contains three tracks, does respectively: the back-mounted track 8, the middle-mounted track 9 and the front-mounted track 10 are provided with longitudinal small wheels 11 at two ends of the bottom of the front-mounted track and are matched with a fixed guide rail 12, track-changing racks 13 are arranged at positions corresponding to the rectangular through holes at the bottom of the front-mounted track 10, the track-changing racks 13 can pass through the rectangular through holes 15 and are matched with track-changing gears 14, the first guide rail 2 can freely move along the fixed guide rail 12 under the driving of a track-changing motor 1601, the first blackboard 1 and the second blackboard are provided with rollers at two ends of the bottom thereof, the rollers are matched with the tracks on the first guide rail 2 and the second guide rail and can freely move on the tracks, support small seats are respectively fixed at two ends of the back surfaces of the first blackboard 1 and the second blackboard through bolts, supporting small seats are provided with supporting shafts capable of freely rotating and erasing rollers 4 in interference fit with the supporting small seats, the scraping blades 5 are hinged on the supporting small seats and are contacted with the erasing rollers, the transmission rotating shaft 18 can rotate freely under the driving of the transmission motor 17 and drives the dust collection conveying belt 603 matched with the transmission rotating shaft to move, the collection box 7 is fixed at the tail end of the dust collection conveying belt 603, and the collection box 7 is clamped at the back parts of the first blackboard and the second blackboard through a sliding groove and can be drawn out at any time by external force.

Supposing that the blackboard that needs to erase this moment is first blackboard 1, and two blackboards and track all are in the state shown in fig. 2, two blackboards are located promptly and put track 9 in, first guide rail 2 and second guide rail are located the centre of first supporting seat 3 and second supporting seat, 3 track difference one-to-ones, first leading track is corresponding with the leading track of second promptly, put the track in first and the second and be corresponding, first rearmounted track is corresponding with the rearmounted track of second, the utility model discloses a theory of operation is:

the switch is pressed down, the track-changing motor 1601 rotates to transmit power to the track-changing gear 14, the track-changing gear 14 is matched with the track-changing rack 13 to drive the first guide rail 2, the longitudinal small wheel 11 longitudinally moves on the longitudinal rail 12 of the first supporting seat 3, the first blackboard 1 is rapidly moved to the area b of the first supporting seat, and the track-changing motor 1601 stops. At this time, the rear rail of the first guide rail 2 (the guide rail below the first blackboard 1) is in a semi-hanging state (no corresponding rail is matched with the rear rail), the rear rail of the first guide rail is matched with the rear rail of the second guide rail (the guide rail below the second blackboard) to form a smooth transverse rail, the front rail of the first guide rail is matched with the middle rail of the second guide rail to form a smooth transverse rail, the front rail of the second guide rail is also in a semi-hanging state, the second blackboard is pushed transversely, transverse movement is carried out on the corresponding rail through rollers at the bottom of the blackboard, in the moving process, the erasing roller 4 at the back of the second blackboard is in a static state, and the erasing surface of the erasing roller sweeps across the writing surface of the first blackboard 1, so that the erasing function is realized. After the erasing process is finished, the transmission motor 17 is started to drive the erasing roller conveyor belt 601, the transmission conveyor belt 602, the dust collection conveyor belt 603 and the erasing roller 4 to move, the erasing roller 4 rotates to remove chalk dust under the action of the scraping blade 5, the dropped chalk dust falls on the dust collection conveyor belt 603, is transported to the collection box 7 through the dust collection conveyor belt 603, and is finally taken away for cleaning by aunt.

The above process can be divided into three stages: (1) an automatic track changing stage; (2) an automatic erasing stage; (3) the automatic collection phase can be illustrated by the following flow chart (initial case is the same as above):

the three functional modules of the blackboard device are completed in sequence, so that the chalk characters can be automatically erased and dust can be stored. The method comprises the following steps: when a track change button is pressed down, a track change motor 1601 operates to drive a track change gear 14 to rotate and transmit power to a track change rack 13, a first guide rail 2 moves on a fixed guide rail 12 of a first supporting seat 3, and at the moment, a first blackboard 1 moves longitudinally along with the first guide rail 2 until the first blackboard 1 reaches a designated position; step two: manually pulling the other blackboard to pass through the blackboard to be erased to finish the erasing process; step three: when the cleaning button is pressed, the transmission motor 17 located inside the blackboard starts to work, and simultaneously drives the erasing roller 4, the erasing roller conveyor belt 601, the transmission conveyor belt 602 and the dust collection conveyor belt 603 to move, so that the function of collecting dust is completed.

(1) Automatic rail changing device

Starting the track-changing motor 1601 → the first guide rail moves backwards (i.e. moves towards the wall) → moves a front track width, the track-changing motor 1601 stops working → the track-changing is completed

(2) Automatic erasing

Pulling the second blackboard → the erasing roller on the back of the second blackboard sweeps over the writing surface of the first blackboard 1 → the erasing is finished

(3) Automatic collection

Starting the driving motor 17 → the wiping roller and the wiping roller belt 601, the driving belt 602, the dust collecting belt 603 start rotating → the blade comes into press contact with the wiping roller → the dust is scraped off to the dust collecting belt 603 → is carried into the collecting box 7 → the end of collection

A power transmission route:

1. orbital transfer motor 1601 → orbital transfer gear 14 → orbital transfer rack 13 → first guide rail 2 → start of orbital transfer

2. Transmission motor 17 → erasing roller conveyer belt 601 → erasing roller 4 rotates → dust removal

3. Transmission motor 17 → bevel gear set → transmission conveyer 602 → dust collection conveyer 603 → collection dust

The following three control programs are preferred for selection:

the first method comprises the following steps: only the first guide rail is set to be changeable, and the second guide rail is matched with the first guide rail but not changeable. When the blackboard erasing device is used for erasing a blackboard, the first blackboard and the second blackboard are placed on the track in the middle at the beginning, the first guide rail and the second guide rail are also placed in the middle, the controller is provided with a forward button and a backward button of the first blackboard, and the first blackboard is pressed to move forward or backward for one time, so that the blackboard to be erased is placed behind. After the track change is finished, the other blackboard is manually dragged to the front of the blackboard to be erased, and the erasing is finished. The controller is also provided with a reset button, after the erasing is finished, the other blackboard is manually pushed to reset, and then the reset button is pressed to enable the rail which is changed into the rail to return to the initial position. If the first blackboard needs to be erased, a retreat button is pressed, the first blackboard retreats by one track, a second blackboard is dragged to cover the first blackboard, the second blackboard is dragged to reset after the first blackboard is erased, then a reset key is pressed, and the first blackboard is positioned on the middle-arranged track; if the second blackboard needs to be erased, the forward button is pressed, the first blackboard advances by one rail, the first blackboard is dragged to cover the second blackboard, after the second blackboard is erased, the first blackboard is manually pulled to reset, the reset key is pressed, and the first blackboard is positioned on the middle rail.

And the second method comprises the following steps: in the first program, if the first blackboard is manually pulled to reset after the erasing is finished, a reset button is not required to be pressed, only two buttons of forward and backward movement are set, namely, only the rail change when the erasing is required is controlled by the button, and the reset after the erasing is manually finished. The program is as follows: the control method is simple in mechanism and good in economical efficiency.

And the third is that: the two blackboards can be set to be capable of changing rails, the blackboards to be erased move backwards, and the blackboards can be automatically reset after being erased. The program is as follows: the control method is characterized in that position switches are required to be arranged at the tail ends of the first guide rail and the second guide rail, a first blackboard button and a second blackboard button are arranged on the control panel, if the first blackboard is to be erased, the first blackboard button is pressed, the rail-changing motor rotates, the first blackboard moves backwards, the second blackboard is pulled, the position switches on the second guide rail are bounced off at the moment, after the erasing is completed, the second blackboard is manually pulled to return to the second guide rail, when the second blackboard completely returns to the second guide rail, the position switches at the tail ends of the second guide rail can be pressed, the motor rotates reversely, the operation opposite to the previous step is executed, the first blackboard moves forwards at the moment, and the resetting is completed.

Claims (9)

1. The utility model provides an automatic erase chalk character and accomodate teaching blackboard of dust, includes first blackboard and second blackboard, its characterized in that still includes three functional module: the blackboard track changing system, the erasing system and the dust collecting system;

the blackboard track-changing system comprises a first supporting seat, a second supporting seat, a first guide rail, a second guide rail, a track-changing gear, a track-changing rack and a track-changing motor, wherein the first blackboard and the second blackboard can move in the first guide rail and the second guide rail in a reciprocating manner, the first supporting seat and the second supporting seat are integrally of a transverse groove type, longitudinal grooves are formed at two ends of the first supporting seat and are used as fixed guide rails, a rectangular through hole is formed in the middle of the first supporting seat, the first guide rail and the second guide rail are connected in the fixed guide rails, at least 2 mutually non-interfering tracks are arranged on the upper surfaces of the first guide rail and the second guide rail, the width of the first supporting seat and the width of the second supporting seat are at least equal to the width of 4 tracks, longitudinal small wheels are arranged at two ends of the bottoms of the first guide rail and the second guide rail and can move longitudinally along the longitudinal grooves, the track-changing rack is arranged in the middle of the back of the first guide, the first guide rail is driven to move longitudinally along the longitudinal groove, and the first blackboard on the first guide rail is driven to move together, so that the rail changing function is realized.

2. The blackboard for teaching purpose of automatically erasing chalk characters and containing dust as claimed in claim 1, wherein the erasing system includes a supporting small seat and an erasing device, the supporting small seats are respectively connected to both ends of the back of the first blackboard and the second blackboard, a supporting shaft is connected to the supporting small seats, and the erasing device is connected to the supporting shaft.

3. The teaching blackboard for automatically erasing chalk characters and containing dust according to claim 2, wherein the dust collection system is a collection box connected below the first blackboard and the second blackboard back erasing device.

4. The blackboard for teaching of automatically erasing chalk characters and containing dust according to claim 2, wherein the supporting small seat is mounted with a rotatable supporting shaft, the erasing device is an erasing roller, the dust collecting system comprises a scraper, an erasing roller conveyor belt, a transmission conveyor belt, a dust collecting conveyor belt, a bevel gear set, a transmission rotating shaft, a driven rotating shaft, a transmission motor and a collecting box, the scraper is connected to the supporting small seat and contacts with the erasing roller, and the erasing roller is driven by an output shaft of the transmission motor through the erasing roller conveyor belt; the end of the output shaft of the transmission motor is connected with a conical gear set, the transmission rotating shaft is connected above the collecting box, the output shaft of the conical gear set drives the transmission rotating shaft to move through a transmission conveying belt, and the transmission rotating shaft drives the driven rotating shaft to move through a dust collecting conveying belt.

5. The blackboard for teaching of automatically erasing chalk characters and containing dust as claimed in claim 1, wherein the first and second supports are attached to the wall by screws to support the whole blackboard device.

6. The blackboard for teaching of automatically erasing chalk characters and containing dust as claimed in claim 1, wherein rollers are connected to both ends of the bottom of the first blackboard and the second blackboard and can roll in the first guide rail and the second guide rail.

7. The blackboard for teaching of automatically erasing chalk characters and containing dust as claimed in claim 4, wherein the support shaft is interference fitted with the erasing roller.

8. The blackboard for teaching of automatically erasing chalk characters and containing dust as claimed in claim 1, wherein the upper surfaces of the first and second rails have 3 tracks which do not interfere with each other, and the widths of the first and second supports are equal to the width of 5 tracks.

9. The blackboard for teaching of automatically erasing chalk characters and containing dust as claimed in any one of claims 1 to 8, further comprising a single chip microcomputer, wherein the single chip microcomputer controls the forward rotation, reverse rotation and rotation of the motor.

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