CN114851748A

CN114851748A - Interconnection blackboard convenient to switch black and white screen

Info

Publication number: CN114851748A
Application number: CN202210506991.5A
Authority: CN
Inventors: 李东清
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-05-11
Filing date: 2022-05-11
Publication date: 2022-08-05

Abstract

The invention relates to an interconnection blackboard, in particular to an interconnection blackboard convenient for switching black and white screens. The invention provides an interconnected blackboard which does not influence the teaching progress and can be switched into a black screen and a white screen conveniently without manual switching. The utility model provides an interconnected blackboard convenient to switch black and white screen, includes spacing, board, handle and first linkage block etc. and the equal slidingtype of spacing left and right sides is equipped with the board that is used for the mr to write teaching content, and one side that two boards kept away from each other all is equipped with the handle, and spacing lower part rear side is equipped with the first linkage block that is used for the support. Can make the reel rotate through driving motor work and upwards pack up the stay cord, and then rotate through the third connecting block and drive two boards and move to the outside, make it no longer block the display panel, alright use the display panel, and then with the board synchronous on the display panel, can make the teaching content that mr writes be seen to the more clear looking over of student of back row.

Description

Interconnection blackboard convenient to switch black and white screen

Technical Field

The invention relates to an interconnection blackboard, in particular to an interconnection blackboard convenient for switching black and white screens.

Background

The interconnected blackboard can write the content with left and right sides blackboard in real time and can be synchronous to the whiteboard page, solves the problem that the whiteboard is written to be unclear in the back row, solves the problem that the classroom teacher can't give lessons through writing on the blackboard.

A dustless interconnected blackboard with publication number CN214083627U belongs to teaching tool technical field, including board main part, set up the bottom tray in board main part bottom, set up and be used for soaking the infiltration clearance structure who wets the blackboard eraser on the bottom tray to and set up the holding groove on the bottom tray, still be provided with the water injection container in the holding groove. According to the dust-free interconnected blackboard provided by the invention, the water injection container is placed in the accommodating groove after being filled with water, the water injection container can be taken out from the accommodating groove at any time when the infiltration cleaning structure needs to be added with water, the water is added into the infiltration cleaning structure, the water addition is more rapid and convenient, the inconvenience in use caused by untimely water addition is prevented, and the appearance of the dust-free interconnected blackboard is more attractive when the water injection container is placed in the accommodating groove. Although dustless use can be accomplished to above-mentioned patent, when needing to switch between this patent board main part on board and the display panel, need manual push-and-pull to accomplish, switching speed is slow, influences mr's lecture progress to because of the board is heavier, the hard circumstances of push-and-pull appears easily.

Therefore, it is necessary to design an interconnected blackboard which does not affect the progress of lectures and is convenient to switch between black and white screens without manual switching.

Disclosure of Invention

In order to overcome the defects that the teaching progress is influenced by manually switching the black screen and the white screen and manual operation is labor-consuming in the conventional interconnected blackboard, the invention aims to provide the interconnected blackboard which does not influence the teaching progress and can be conveniently switched between the black screen and the white screen without manual switching.

The technical scheme is as follows: an interconnected blackboard convenient for switching black and white screens comprises a limiting frame, a writing board, a handle, a first connecting block, a guide rod, a display board, a reset spring, an expansion mechanism, a pulling mechanism and a clamping mechanism, wherein the left side and the right side of the limiting frame are both provided with the writing board used for teachers to write teaching contents in a sliding manner, one sides of the two writing boards, which are far away from each other, are both provided with the handle, the handle can facilitate people to pull the writing board, the rear side of the lower part of the limiting frame is provided with the first connecting block used for supporting, the left side and the right side of the first connecting block are both provided with the guide rod in a sliding manner, the display board interconnected with the writing board is connected between the front sides of the two guide rods, the display board is in sliding fit with the limiting frame, the display board is in contact fit with the two writing boards, the reset spring is connected between the two guide rods and the first connecting block, the rear side of the limiting frame is provided with the expansion mechanism, the rear side of the upper part of the limiting frame is provided with the pulling mechanism which can be free from manual push-pull of the writing board, the top of the limiting frame is provided with a clamping mechanism which enables the writing board to be more stable.

As the improvement of above-mentioned scheme, the expansion mechanism is including the leading truck, the second connecting block, the slide bar, head rod and third connecting block, spacing upper portion rear side bilateral symmetry is equipped with the leading truck, the leading truck is located the display panel rear side, equal longitudinal symmetry is equipped with the second connecting block between one side that two leading trucks are close to each other, two leading truck downside all slidingtype are equipped with the slide bar, equal rotary type is equipped with the third connecting block that is used for making the board expand on two slide bars, the equal rotary type in one side that two board upper portions are close to each other is equipped with the head rod, the lower extreme of two head rods all links to each other with the third connecting block upper end of homonymy.

As an improvement of the scheme, the pulling mechanism comprises a connecting plate, connecting frames, a driving motor, reels and pull ropes, the connecting frames are arranged at the positions, located on the inner sides of the two guide frames, of the rear side of the upper portion of the limiting frame, the driving motor used for enabling the writing board to automatically unfold is installed on the connecting frames, the reels are arranged on output shafts of the driving motor, the pull ropes are wound on the reels, the connecting plate is connected between the rear sides of the two sliding rods, and the tail ends of the pull ropes are connected with the connecting plate.

As the improvement of above-mentioned scheme, chucking mechanism is including the supporting shoe, the guiding axle, the wedge, chucking spring, the fourth connecting block, wedge rod and compression spring, spacing top left and right sides all is equipped with the supporting shoe, equal slidingtype is equipped with the guiding axle on two supporting shoes, one side that two guiding axle lower parts are close to each other all is equipped with the wedge, the wedge is used for blocking the board, all be connected with chucking spring between the supporting shoe of two guiding axles and homonymy, two guiding axle rear sides all are equipped with the fourth connecting block, display panel rear portion upside bilateral symmetry is equipped with the wedge pole, all be connected with compression spring between two board upper portions and the spacing, two fourth connecting blocks all cooperate with the wedge rod contact of homonymy, fourth connecting block and wedge rod cooperation enable board automatic re-setting.

As the improvement of above-mentioned scheme, still including being used for preventing the collection mechanism that chalk dust from wafting at will, collect the mechanism including collecting frame, scraper blade and lifter plate, spacing bottom is equipped with collects the frame, collects the frame and is used for saving chalk dust, and it has the feed opening to collect bottom right side in the frame, and the left side slidingtype is equipped with the scraper blade that is used for clearing up chalk dust in the collection frame, and the slidingtype is equipped with the lifter plate on the feed opening.

As the improvement of above-mentioned scheme, still including the drive mechanism who is used for making the automatic chalk dust of clearance of scraper blade, drive mechanism is including the fifth connecting block, a supporting plate, the screw thread axle, the gear, the gag lever post, rack and spacing axle, the right side of spacing upper portion rear side wall is equipped with the backup pad, the rotation type is equipped with the screw thread axle in the backup pad, the screw thread axle downside is connected with the fifth connecting block through threaded connection's mode, fifth connecting block left end links to each other with the connecting plate bottom, the screw thread axle bottom is equipped with the gear, it is equipped with the gag lever post to collect frame back wall, gag lever post left side slidingtype is equipped with the rack, rack and gear engagement, rack left wall is equipped with spacing axle, the scraper blade links to each other with spacing axle slidingtype, the scraper blade contacts the cooperation with rack left end.

As the improvement of above-mentioned scheme, still including being used for making the lifter plate rebound no longer keep the shedding mechanism of feed opening, shedding mechanism is including coupling spring, the stopper, the slider, the second connecting rod, sixth connecting block and third connecting rod, be connected with coupling spring between scraper blade and the spacing axle, collect frame bottom right side front and back symmetry and be equipped with the stopper, the slidingtype is equipped with the slider between two stoppers, slider upper portion rear side is equipped with the second connecting rod, the second connecting rod links to each other with the gag lever post slidingtype, rack and second connecting rod contact cooperation, slider right side rotary type is equipped with the third connecting rod, the lifter plate bottom is equipped with the sixth connecting block, the third connecting rod right-hand member links to each other with sixth connecting block rotary type.

As an improvement of the scheme, the two writing boards are both made of color-coated steel plates.

Compared with the prior art, the invention has the following advantages: 1. the reel can rotate to retract the pull rope upwards through the work of the driving motor, and then the third connecting block rotates to drive the two writing boards to move outwards, so that the two writing boards do not block the display board any more, the display board can be used, and the writing boards are synchronized on the display board, so that students in the back row can more clearly see the teaching contents written by teachers;

2. the writing board can be clamped under the action of the wedge-shaped block, the writing board is prevented from moving randomly, people can write conveniently, meanwhile, the writing board can be automatically reset under the action of the compression spring, the writing board is automatically carried out, manual operation is not needed, and labor is saved;

3. the collecting frame can collect chalk dust generated during writing on the writing board, and meanwhile, the chalk dust can be scraped to the right side by moving the scraper to the right side, so that the chalk dust falls off and is cleaned through the discharging opening, and the chalk dust cannot fall on the ground randomly to cause dust raising;

4. the connecting plate drives the fifth connecting block to move upwards, so that the threaded shaft rotates, the rack drives the scraper to move towards the right side through the limiting shaft to scrape and clean chalk dust, manual pushing of the scraper is not needed, and labor is saved and automation is improved;

5. when the rack moves to the right side and contacts with the second link rod, the second connecting rod is pushed, so that the third connecting rod rotates to drive the sixth connecting block to move upwards to be opened with the lifting plate, chalk dust convenient to drop into the garbage bag through the discharging opening, and the lifting plate is not required to be pulled manually.

Drawings

Fig. 1 is a schematic perspective view of a first embodiment of the present invention.

Fig. 2 is a schematic perspective view of a second embodiment of the present invention.

Fig. 3 is a partial perspective view of the present invention.

Fig. 4 is a schematic perspective view of the deployment mechanism of the present invention.

Fig. 5 is a schematic perspective view of the pulling mechanism of the present invention.

Fig. 6 is a schematic perspective view of the chucking mechanism of the present invention.

Fig. 7 is an enlarged view of the invention at a.

Fig. 8 is a schematic perspective view of the collecting mechanism of the present invention.

Fig. 9 is a cross-sectional view of the collection mechanism of the present invention.

Fig. 10 is a schematic perspective view of the transmission mechanism of the present invention.

Fig. 11 is a schematic view of a first partial structure of the transmission mechanism of the present invention.

Fig. 12 is a schematic view of a second partial structure of the transmission mechanism of the present invention.

Fig. 13 is a schematic perspective view of the discharging mechanism of the present invention.

Fig. 14 is an enlarged view of the invention at B.

Fig. 15 is a partial perspective view of the discharging mechanism of the present invention.

Number designation in the figures: 1. a limiting frame, 2, a writing board, 3, a handle, 4, a first connecting block, 5, a guide rod, 6, a display board, 7, a reset spring, 8, a spreading mechanism, 80, a guide frame, 81, a second connecting block, 82, a sliding rod, 83, a first connecting rod, 84, a third connecting block, 9, a pulling mechanism, 90, a connecting plate, 91, a connecting frame, 92, a driving motor, 93, a reel, 94, a pull rope, 10, a clamping mechanism, 100, a supporting block, 101, a guide shaft, 102, a wedge-shaped block, 103, a clamping spring, 104, a fourth connecting block, 105, a wedge-shaped rod, 106, a compression spring, 11, a collecting mechanism, 110, a collecting frame, 111, a scraping plate, 112, a lifting plate, 12, a transmission mechanism, 120, a fifth connecting block, 121, a supporting plate, 122, a threaded shaft, 123, a gear, 124, a limiting rod, 125, a rack, 126, a limiting shaft, 13 and a discharging mechanism, 130. connecting spring 131, limiting block 132, slider 133, second connecting rod 134, sixth connecting block 135 and third connecting rod.

Detailed Description

The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present application. The conditions used in the examples may be further adjusted according to the conditions of the particular manufacturer, and the conditions not specified are generally the conditions in routine experiments.

Example 1

An interconnected blackboard convenient for switching black and white screens is shown in figures 1-3 and comprises a limiting frame 1, writing boards 2, handles 3, first connecting blocks 4, guide rods 5, display boards 6, a reset spring 7, an unfolding mechanism 8, a pulling mechanism 9 and a clamping mechanism 10, wherein the writing boards 2 capable of being written by chalk are arranged on the left side and the right side of the limiting frame 1 in a sliding mode, the two writing boards 2 are made of color-coated steel plates which are wear-resistant and not prone to leg color and are very durable, the handles 3 are welded on the sides, far away from each other, of the two writing boards 2, the rear side of the lower portion of the limiting frame 1 is connected with the first connecting blocks 4 in a screw connection mode, the left side and the right side of each first connecting block 4 are provided with the guide rods 5 in a sliding mode, the display boards 6 used for synchronizing the contents on the writing boards 2 are connected between the front sides of the two guide rods 5, and the display boards 6 are in sliding fit with the limiting frame 1, display panel 6 and two 2 contact cooperations of board, all be connected with reset spring 7 between two guide bars 5 and the

first linkage block

4, and 1 rear side of spacing is equipped with

expansion mechanism

8, and 1 upper portion rear side of spacing is equipped with the pulling mechanism 9 that is used for making two 2 automatic expansions of board, and 1 top of spacing is equipped with the chucking mechanism 10 that is used for fixed board 2.

As shown in fig. 1, 2 and 4, the unfolding mechanism 8 includes a guide frame 80, a second connecting block 81, sliding rods 82, a first connecting rod 83 and a third connecting block 84, the left and right symmetry of the upper portion of the limiting frame 1 is connected with the guide frame 80 through a bolt connection mode, the guide frame 80 is located at the rear side of the display panel 6, the second connecting block 81 is welded between the two adjacent sides of the two guide frames 80 in an up-and-down symmetrical manner, the sliding rods 82 are arranged on the lower sides of the two guide frames 80 in a sliding manner, the third connecting block 84 is arranged on the two sliding rods 82 in a rotating manner, the first connecting rod 83 is arranged on the adjacent side of the upper portions of the two writing boards 2 in a rotating manner, and the lower ends of the two first connecting rods 83 are connected with the upper end of the third connecting block 84 on the same side.

As shown in fig. 2 and 5, the pulling mechanism 9 includes a connecting plate 90, a connecting frame 91, a driving motor 92, a reel 93, and a pulling rope 94, the connecting frame 91 is connected to the positions of the upper rear side of the position-limiting frame 1 inside the two guide frames 80 by bolts, the driving motor 92 is mounted on the connecting frame 91, the reel 93 is mounted on the output shaft of the driving motor 92, the pulling rope 94 for unfolding the two tablets 2 is wound on the reel 93, the connecting plate 90 is connected between the rear sides of the two sliding rods 82, and the tail end of the pulling rope 94 is connected to the connecting plate 90.

As shown in fig. 1, 2, 6 and 7, the chucking mechanism 10 includes a support block 100, a guide shaft 101, wedge 102, chucking spring 103, fourth connecting block 104, wedge 105 and compression spring 106, supporting shoe 100 has all been welded to the spacing 1 top left and right sides, all the slidingtype is equipped with guiding axle 101 on two supporting shoes 100, one side that two guiding axle 101 lower parts are close to each other all is equipped with the wedge 102 that is used for blocking board 2, all be connected with chucking spring 103 between two guiding axle 101 and the supporting shoe 100 of homonymy, two guiding axle 101 rear sides all are equipped with fourth connecting

block

104, 6 rear portion upside bilateral symmetry of display panel is equipped with the wedge 105 that is used for making board 2 automatic contraction reset, all be connected with compression spring 106 between two board 2 upper portions and the spacing 1, two fourth connecting blocks 104 all cooperate with the contact of the wedge 105 of homonymy.

When people need to use the device, people can fix the first connecting block 4 on the wall surface through screws, so the device can be integrally installed on the wall surface, a teacher can use the device to teach students, people can use chalk to write teaching on the writing board 2, meanwhile, a computer can be connected to the display board 6, some teaching videos can be demonstrated through the display board 6, the writing board 2 and the display board 6 are synchronously connected, the writing content on the writing board 2 can be synchronously displayed on the display board 6 in real time, the problem that the writing on the writing board 2 is not clear after being cleared is solved, the display board 6 is blocked by the writing board 2 initially, when people need to use the display board 6, people firstly start the driving motor 92 to work, the output shaft of the driving motor 92 rotates to drive the winding wheel 93 to rotate, the winding wheel 93 upwards winds the pulling rope 94, and winds the pulling rope 94 onto the winding wheel 93, the pulling rope 94 moves upward to drive the connecting plate 90 to move upward, so that the connecting plate 90 drives the sliding rod 82 to move upward along the guide frame 80, the sliding rod 82 drives the third connecting block 84 to rotate, so that the upper end of the third connecting block 84 drives the first connecting rod 83 to move outward, the first connecting rod 83 further pulls the writing board 2 to move outward, so that the two writing boards 2 drive the handles 3 to move away from each other, the compression spring 106 is compressed, the reset spring 7 is in a compressed state initially, when the writing board 2 moves outward and is not in contact with the display panel 6 any more, the guide rod 5 drives the display panel 6 to move forward under the action of the reset spring 7, so that the display panel 6 moves forward along the limiting frame 1 to align with the writing board 2, the chucking spring 103 is in a compressed state initially, the display panel 6 moves forward while driving the wedge-shaped rod 105 to move forward, the wedge-shaped rod 105 is not contacted with the fourth connecting block 104 any more, the guide shaft 101 drives the wedge-shaped block 102 and the fourth connecting block 104 to move downwards to reset under the resetting action of the clamping spring 103, the clamping spring 103 is reset to a natural state, the wedge-shaped block 102 moves downwards to block the writing board 2 and prevent the writing board 2 from moving randomly, when the driving motor 92 works for a preset time, the driving motor 92 automatically closes to work without manual closing, after the display panel 6 is opened, people can start to use the display panel 6, so that writing on the writing board 2 is synchronized to the display panel 6, students can conveniently check the writing, when people do not need to use the display panel 6, people can push the display panel 6 to the rear side to drive the guide rod 5 to move to the rear side, the resetting spring 7 is compressed, the display panel 6 moves to the rear side and simultaneously drives the wedge-shaped rod 105 to move to the rear side, so that the inclined plane of the wedge-shaped rod 105 pushes the fourth connecting block 104 to move upwards, meanwhile, the guide shaft 101 and the wedge-shaped block 102 are driven to move upwards, the chucking spring 103 is compressed, the wedge-shaped block 102 moves upwards to stop the writing board 2, the writing board 2 drives the handle 3 to move inwards to reset under the reset action of the compression spring 106, so that the tablet 2 drives the first connecting rod 83 to move inward, the first connecting rod 83 drives the third connecting block 84 to rotate reversely to reset, so that the third connecting block 84 drives the sliding rod 82 to move downwards along the guide frame 80, the sliding rod 82 drives the connecting plate 90 to move downwards, so that the connecting plate 90 pulls the pull rope 94 to move downwards, the reel 93 is driven to idle, when the two writing boards 2 approach each other to block the display board 6, the hand pushing the display board 6 can be released, the cooperation between the wedge-shaped rod 105 and the fourth connecting block 104 does not need to pull the writing board 2 manually to reset, and the mode of automatically switching the writing board 2 and the display board 6 is more labor-saving and practical.

Example 2

On the basis of embodiment 1, as shown in fig. 1, 2, 8 and 9, the chalk dust collector further comprises a collecting mechanism 11, the collecting mechanism 11 comprises a collecting frame 110, a scraping plate 111 and a lifting plate 112, the collecting frame 110 for collecting chalk dust is arranged at the bottom of the limiting frame 1, a discharging opening for conveniently dropping and collecting chalk dust is formed in the right side of the bottom in the collecting frame 110, the scraping plate 111 for scraping chalk dust is arranged in the collecting frame 110 in a sliding manner on the left side, and the lifting plate 112 is arranged on the discharging opening in a sliding manner.

When people use chalk to write teaching contents on the writing board 2, some chalk dust will fall into the collection frame 110, when more chalk dust is stored in the collection frame 110, people can slide the lifting board 112 upwards firstly, the lifting board 112 is fixed with the collection frame 110 through friction, people slide the lifting board 112 upwards to the place where the feed opening is no longer blocked, the garbage can be placed on the ground aligned with the feed opening, then the scraper 111 is moved towards the right side, so that the scraper 111 scrapes the chalk dust towards the right side, and then the chalk dust can fall into the garbage can through the feed opening, after the chalk dust is cleaned, people move the scraper 111 towards the left side to reset to the initial state, and the operation can avoid the chalk dust generated by writing from falling on the ground randomly to cause dust raising and further pollute the environment.

As shown in fig. 2, 10, 11 and 12, the transmission mechanism 12 is further included, the transmission mechanism 12 includes a fifth connecting block 120 and a supporting plate 121, the chalk dust collecting device comprises a threaded shaft 122, a gear 123, a limiting rod 124, a rack 125 and a limiting shaft 126, wherein the right side of the rear side wall of the upper part of the limiting frame 1 is connected with a supporting plate 121 in a screw connection mode, the threaded shaft 122 is rotatably arranged on the supporting plate 121, the lower side of the threaded shaft 122 is connected with a fifth connecting block 120 in a screw connection mode, the left end of the fifth connecting block 120 is connected with the bottom of a connecting plate 90, the gear 123 is arranged at the bottom of the threaded shaft 122, the limiting rod 124 is arranged on the rear wall of the collecting frame 110, the rack 125 used for enabling a scraper 111 to automatically scrape chalk dust is slidably arranged on the left side of the limiting rod 124, the rack 125 is meshed with the gear 123, the limiting shaft 126 is arranged on the left wall of the rack 125, the scraper 111 is slidably connected with the limiting shaft 126, and the scraper 111 is in contact fit with the left end of the rack 125.

When people use the device, the garbage bag can be fixed at a position aligned with the feed opening, when people need to use the display panel 6, when people open the tablet 2, the connecting plate 90 moves upwards to drive the fifth connecting block 120 to move upwards, so that the fifth connecting block 120 moves upwards along the threaded shaft 122, the threaded shaft 122 is driven to rotate, the gear 123 drives the rack 125 to move towards the right side along the limiting rod 124, the rack 125 drives the limiting shaft 126 to move towards the right side, the limiting shaft 126 drives the scraper 111 to move towards the right side, the scraper 111 can scrape the chalk dust in the collecting frame 110 towards the right side, people need to push the lifting plate 112 upwards to prevent the lifting plate from blocking the feed opening, so that the chalk dust can uniformly fall into the garbage bag under the action of the scraper 111, and simultaneously after the scraper 111 moves towards the right side to the limit, the rack 125 continues to drive the limiting shaft 126 to move towards the right side, so that the limiting shaft 126 moves to a certain position towards the right side along the scraper 111, the operation can be performed automatically without manually cleaning chalk dust, people only need to take the garbage bag down after the garbage bag is filled, when people do not need to use the display panel 6 to move and reset the writing board 2 towards the inner side, the connecting plate 90 moves downwards to drive the fifth connecting block 120 to move downwards, the fifth connecting block 120 moves downwards along the threaded shaft 122, the threaded shaft 122 and the gear 123 are driven to rotate in the opposite direction, the gear 123 drives the rack 125 to move and reset towards the left side along the limiting rod 124, and the rack 125 simultaneously drives the scraper 111 and the limiting shaft 126 to move towards the left side.

As shown in fig. 1, 13, 14 and 15, the automatic ascending discharging device further includes a discharging mechanism 13 for automatically ascending the lifting plate 112, the discharging mechanism 13 includes a connecting spring 130, a limiting block 131, a sliding block 132, a second connecting rod 133, a sixth connecting block 134 and a third connecting rod 135, the connecting spring 130 is connected between the scraper 111 and the limiting shaft 126, the limiting block 131 is connected to the right side of the bottom of the collecting frame 110 in a front-back symmetrical manner by bolts, the sliding block 132 is slidably disposed between the two limiting blocks 131, the second connecting rod 133 is welded to the rear side of the upper portion of the sliding block 132, the second connecting rod 133 is slidably connected to the limiting rod 124, the rack 125 is in contact fit with the second connecting rod 133, the third connecting rod 135 is rotatably disposed on the right side of the sliding block 132, the sixth connecting block 134 is disposed on the bottom of the lifting plate 112, and the right end of the third connecting rod 135 is rotatably connected to the sixth connecting block 134.

When the rack 125 drives the limiting shaft 126 and the scraper 111 to move to the right, the scraper 111 moves to the right to scrape chalk dust to move to the right, when the scraper 111 moves to the right to the limit, the rack 125 continues to drive the limiting shaft 126 to move to the right to compress the connecting spring 130, when the rack 125 moves to the right to contact with the second connecting rod 133, the second connecting rod 133 and the sliding block 132 are driven to move to the right to drive the third connecting rod 135 to rotate, the third connecting rod 135 drives the sixth connecting block 134 and the lifting plate 112 to move upwards, so that the lifting plate 112 no longer blocks the discharging port, chalk dust can fall into the garbage bag, when the rack 125 drives the limiting shaft 126 to move to the left to reset, the limiting shaft 126 no longer presses the connecting spring 130, the connecting spring 130 will reset, so as to drive the scraper 111 to move to the left, when the rack 125 moves to reset to the left to no longer contact with the second connecting rod 133, people alright press down lifter plate 112 and reset for lifter plate 112 drives sixth connecting block 134 and moves downwards and resets, and sixth connecting block 134 just drives third connecting rod 135 antiport and resets, makes third connecting rod 135 promote slider 132 and second connecting rod 133 and move to the left side and reset, so the operation can need not manually with lifter plate 112 rebound open, can go on automatically, and is more laborsaving, and connecting spring 130 can make more stable that scraper blade 111 resets.

The above-mentioned embodiments are only preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, so that all equivalent changes made by the contents of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An interconnected blackboard convenient for switching black and white screens comprises a limiting frame (1), writing boards (2), handles (3), first connecting blocks (4), guide rods (5), display boards (6) and reset springs (7), wherein the writing boards (2) used for teachers to write teaching contents are arranged on the left side and the right side of the limiting frame (1) in a sliding mode, the handles (3) are arranged on the sides, away from each other, of the two writing boards (2), the writing boards (2) can be conveniently pulled by people through the handles (3), the first connecting blocks (4) used for supporting are arranged on the rear side of the lower portion of the limiting frame (1), the guide rods (5) are arranged on the left side and the right side of the first connecting blocks (4) in a sliding mode, the display boards (6) used for being interconnected with the writing boards (2) are connected between the front sides of the two guide rods (5), the display boards (6) are in sliding fit with the limiting frame (1), the display boards (6) are in contact fit with the two writing boards (2), all be connected with reset spring (7) between two guide bars (5) and first connecting block (4), characterized by, still including expanding mechanism (8), pulling mechanism (9) and chucking mechanism (10), spacing (1) rear side is equipped with expanding mechanism (8), spacing (1) upper portion rear side is equipped with pulling mechanism (9) that can need not artifical push-and-pull board (2), spacing (1) top is equipped with chucking mechanism (10) that make board (2) more stable.

2. The interactive blackboard capable of conveniently switching black and white screens as claimed in claim 1, wherein the unfolding mechanism (8) includes a guide frame (80), a second connecting block (81), slide bar (82), head rod (83) and third connecting block (84), spacing (1) upper portion rear side bilateral symmetry is equipped with leading truck (80), leading truck (80) are located display panel (6) rear side, equal longitudinal symmetry is equipped with second connecting block (81) between the one side that two leading truck (80) are close to each other, two leading truck (80) downside all slidingtype are equipped with slide bar (82), equal rotary type is equipped with third connecting block (84) that are used for making board (2) expand on two slide bar (82), the equal rotary type in one side that two board (2) upper portions are close to each other is equipped with head rod (83), the lower extreme of two head rods (83) all links to each other with third connecting block (84) upper end of homonymy.

3. The interconnected blackboard convenient for switching black and white screens as claimed in claim 2, wherein the pulling mechanism (9) includes a connecting plate (90), a connecting frame (91), a driving motor (92), a winding wheel (93) and a pulling rope (94), the connecting frame (91) is arranged at the position of the rear side of the upper part of the limiting frame (1) at the inner side of the two guide frames (80), the driving motor (92) for automatically unfolding the writing board (2) is installed on the connecting frame (91), the winding wheel (93) is arranged on the output shaft of the driving motor (92), the pulling rope (94) is wound on the winding wheel (93), the connecting plate (90) is connected between the rear sides of the two sliding rods (82), and the tail end of the pulling rope (94) is connected with the connecting plate (90).

4. The interconnected blackboard convenient for switching black and white screens as claimed in claim 3, wherein the chucking mechanism (10) comprises supporting blocks (100), guide shafts (101), wedge blocks (102), chucking springs (103), fourth connecting blocks (104), wedge rods (105) and compression springs (106), the supporting blocks (100) are arranged on the left and right sides of the top of the limiting frame (1), the guide shafts (101) are arranged on the two supporting blocks (100) in a sliding manner, the wedge blocks (102) are arranged on the sides of the lower portions of the two guide shafts (101) close to each other, the wedge blocks (102) are used for blocking the writing board (2), the chucking springs (103) are connected between the two guide shafts (101) and the supporting blocks (100) on the same side, the fourth connecting blocks (104) are arranged on the rear sides of the two guide shafts (101), the wedge rods (105) are symmetrically arranged on the left and right sides of the upper side of the rear portion of the display board (6), compression springs (106) are connected between the upper portions of the two writing boards (2) and the limiting frame (1), the two fourth connecting blocks (104) are in contact fit with the wedge-shaped rods (105) on the same side, and the fourth connecting blocks (104) are matched with the wedge-shaped rods (105) to enable the writing boards (2) to reset automatically.

5. The interconnected blackboard convenient to switch black and white screens as claimed in claim 4, further comprising a collecting mechanism (11) for preventing chalk dust from floating randomly, wherein the collecting mechanism (11) comprises a collecting frame (110), a scraping plate (111) and a lifting plate (112), the collecting frame (110) is arranged at the bottom of the limiting frame (1), the collecting frame (110) is used for storing chalk dust, a discharging opening is formed in the right side of the bottom in the collecting frame (110), the scraping plate (111) used for cleaning chalk dust is arranged in the left side in the collecting frame (110) in a sliding manner, and the lifting plate (112) is arranged on the discharging opening in a sliding manner.

6. The interconnected blackboard convenient for switching black and white screens as claimed in claim 5, further comprising a transmission mechanism (12) for automatically cleaning chalk dust by the scraper (111), wherein the transmission mechanism (12) comprises a fifth connecting block (120), a support plate (121), a threaded shaft (122), a gear (123), a limit rod (124), a rack (125) and a limit shaft (126), the support plate (121) is arranged on the right side of the upper rear side wall of the limit frame (1), the threaded shaft (122) is rotatably arranged on the support plate (121), the fifth connecting block (120) is connected to the lower side of the threaded shaft (122) in a threaded connection manner, the left end of the fifth connecting block (120) is connected to the bottom of the connecting plate (90), the gear (123) is arranged at the bottom of the threaded shaft (122), the limit rod (124) is arranged on the rear wall of the collecting frame (110), the rack (125) is slidably arranged on the left side of the limit rod (124), the rack (125) is meshed with the gear (123), a limiting shaft (126) is arranged on the left wall of the rack (125), the scraper (111) is connected with the limiting shaft (126) in a sliding mode, and the scraper (111) is in contact fit with the left end of the rack (125).

7. The interconnected blackboard convenient for switching black and white screens as claimed in claim 6, further comprising a discharging mechanism (13) for making the lifting plate (112) move upwards without blocking the feed opening, the discharging mechanism (13) comprises a connecting spring (130), a limiting block (131), a sliding block (132), a second connecting rod (133), a sixth connecting block (134) and a third connecting rod (135), the connecting spring (130) is connected between the scraping plate (111) and the limiting shaft (126), the limiting blocks (131) are symmetrically arranged at the front and back of the right side of the bottom of the collecting frame (110), the sliding block (132) is arranged between the two limiting blocks (131) in a sliding manner, the second connecting rod (133) is arranged at the rear side of the upper part of the sliding block (132), the second connecting rod (133) is connected with the limiting rod (124) in a sliding manner, the rack (125) is in contact fit with the second connecting rod (133), the third connecting rod (135) is rotatably arranged at the right side of the sliding block (132), the bottom of the lifting plate (112) is provided with a sixth connecting block (134), and the right end of the third connecting rod (135) is rotatably connected with the sixth connecting block (134).

8. The interactive blackboard convenient for switching between black and white screens as claimed in claim 1, wherein the two writing boards (2) are made of color coated steel plates.