1. An erasing device of an electronic whiteboard comprises an electronic whiteboard main body (1), and is characterized in that: the electronic whiteboard comprises an electronic whiteboard body (1), wherein a first limiting plate (2) and a second limiting plate (3) are fixedly connected to the front end of the electronic whiteboard body (1), the second limiting plate (3) is located on the right side of the first limiting plate (2), a first connecting plate (5) is fixedly connected to the lower end of the first limiting plate (2), the second limiting plate (3) is fixedly connected to the upper end of the first connecting plate (5), a servo motor (12) is fixed to the lower end of the first connecting plate (5), the output end of the servo motor (12) penetrates through the first connecting plate (5) and is fixedly connected with a lead screw (13), a threaded ring (27) is in threaded connection with the circumferential surface of the lead screw (13), a first sliding rod (28) is fixedly connected to the left end of the threaded ring (27), a supporting plate (29) is fixedly connected to the left end of the first sliding rod (28), a first sliding hole (4) is formed in the right end of the second limiting plate (3), first slide bar (28) sliding connection is in first slide opening (4), layer board (29) sliding connection is between first limiting plate (2) and second limiting plate (3), the upside of layer board (29) is provided with coupling mechanism, the right-hand member fixedly connected with fourth connecting plate (22) of whiteboard main part (1), the left end fixedly connected with electric telescopic handle (23) of fourth connecting plate (22), the right-hand member of second limiting plate (3) is opened and is dug there is round hole (6), the output activity of electric telescopic handle (23) is pegged graft in round hole (6), the right side of screw ring (27) is provided with actuating mechanism, the upside of whiteboard main part (1) is provided with tilting mechanism, be provided with elasticity mechanism in the tilting mechanism, the upside of whiteboard main part (1) is provided with magnetic mechanism.

2. An erasing apparatus of an electronic whiteboard according to claim 1, wherein: the connecting mechanism comprises a T-shaped block (30), a sliding block (16), a T-shaped hole (17), a third connecting plate (18), two inserting rods (19), an erasing device main body (20), a mounting groove (21) and two fixing grooves, wherein the T-shaped block (30) is fixedly connected to the upper end of a supporting plate (29), the sliding block (16) is positioned on the upper side of the supporting plate (29), the T-shaped hole (17) is drilled at the right end of the sliding block (16), the T-shaped block (30) is slidably connected into the T-shaped hole (17), the third connecting plate (18) is fixedly connected to the upper end of the sliding block (16), the two inserting rods (19) are fixedly connected to the front end of the third connecting plate (18), the erasing device main body (20) is positioned on the front side of the third connecting plate (18), the mounting groove (21) is drilled at the rear end of the erasing device main body (20), and the two fixing grooves are drilled on the front inner wall of the mounting, the two inserting rods (19) are movably inserted into the two fixing grooves respectively.

3. An erasing apparatus of an electronic whiteboard according to claim 2, wherein: the driving mechanism comprises a fifth connecting plate (26), a rack (25) and a gear (24), the fifth connecting plate (26) is fixedly connected to the right end of the threaded ring (27), the rack (25) is fixedly connected to the rear end of the fifth connecting plate (26), and the gear (24) is meshed with the rack (25).

4. An erasing apparatus of an electronic whiteboard according to claim 3, wherein: the turnover mechanism comprises two support plates (7), a rotating shaft (11), a rotating rod (8), a sixth connecting plate (38), a third limiting plate (35) and a limiting sliding hole (37), wherein the two support plates (7) are fixedly connected to the upper end of the electronic whiteboard main body (1), the rotating rod (8) is rotatably connected with the right end of the left supporting plate (7) through a rotating shaft (11), the rotating rod (8) is rotatably connected in the right side supporting plate (7), the sixth connecting plate (38) is fixedly connected on the circumferential surface of the supporting plate (7), the third limiting plate (35) is fixedly connected to the front end of the sixth connecting plate (38), spacing slide opening (37) cut in the right-hand member of third limiting plate (35), spacing slide opening (37) with erase device main part (20) phase-match, gear (24) fixed connection is in the right-hand member of bull stick (8).

5. An erasing apparatus of an electronic whiteboard according to claim 4, wherein: elasticity mechanism includes spring (34), second slide bar (33), push pedal (32) and second slide opening (36), second slide opening (36) are dug in the front end of third limiting plate (35), second slide bar (33) sliding connection is in second slide opening (36), push pedal (32) fixed connection is in the rear end of second slide bar (33), push pedal (32) sliding connection is in spacing slide opening (37), spring (34) fixed connection is in the left inner wall of spacing slide opening (37), the right-hand member fixed connection of spring (34) is in the left end of push pedal (32), push pedal (32) and spacing slide opening (37) phase-match.

6. An erasing apparatus of an electronic whiteboard according to claim 5, wherein: magnetic force mechanism includes fixed plate (9) and two magnetite (10), fixed plate (9) fixed connection is in the upper end of whiteboard main part (1), and fixed plate (9) are located the rear side of two backup pad (7), two equal fixed connection in the front end of fixed plate (9), two of magnetite (10) equal magnetism is connected in third limiting plate (35).

7. An erasing apparatus of an electronic whiteboard according to claim 6, wherein: the electronic whiteboard is characterized in that a second connecting plate (15) is fixedly connected to the right end of the electronic whiteboard main body (1), a limiting ring (14) is fixedly connected to the lower end of the second connecting plate (15), and the screw rod (13) is rotatably connected into the limiting ring (14).

8. An erasing apparatus of an electronic whiteboard according to claim 7, wherein: the upper end of the supporting plate (29) is fixedly connected with a baffle (31), the baffle (31) is positioned on the right side of the T-shaped block (30), and the baffle (31) is matched with the sliding block (16).

9. An erasing apparatus of an electronic whiteboard according to claim 8, wherein: the surface of the baffle (31) is wrapped with a rubber sleeve, and anti-skid lines are carved on the surface of the rubber sleeve.

10. An erasing apparatus of an electronic whiteboard according to claim 9, wherein: the length of the first limiting plate (2) is smaller than that of the second limiting plate (3), and the sum of the lengths of the first limiting plate (2) and the erasing device main body (20) is equal to that of the second limiting plate (3).

Background

The projector is placed behind the electronic whiteboard to project computer images, and the computer images are displayed from the back of the whiteboard, so that a user can operate the projector very naturally, and projection light cannot be blocked to generate any shadow. The system composition of the rear projection type electronic whiteboard is the same as that of the front projection type electronic whiteboard, a projector is integrated, a placing space for a PC is reserved, and the rear projection type electronic whiteboard is divided into a cabinet type electronic whiteboard and a wall-mounted electronic whiteboard according to installation: wall-mounted electronic whiteboards and cabinet type electronic whiteboards, the electronic whiteboards need to use erasing devices when in use.

In the prior art, application number 201720291242.X discloses an erasing device of an electronic whiteboard, which comprises the electronic whiteboard, a CPU and an eraser; the electronic whiteboard is provided with a pressure sensor; the pressure sensor is connected with the CPU; the CPU is used for erasing information on the electronic whiteboard; the eraser comprises an erasing surface, wherein a boss is arranged on the erasing surface; when the eraser is used for erasing information on the electronic whiteboard, the pressure value of the pressure sensor is changed by the contact of the boss and the electronic whiteboard. The utility model provides a write the in-process, the palm can be to the problem that information mistake on the whiteboard deleted, and simple structure, realizes easily, has also solved through calling the electron eraser, pushes away to drag and the touch is erased and is used inconvenient problem, has improved the comfort level in the user use, but because the user height is different, is difficult to erase whiteboard eminence position, stands and operates very danger on the ladder, is difficult to satisfy the demand in reality.

Disclosure of Invention

The invention aims to provide an erasing device of an electronic whiteboard, which can realize the convenience of erasing the high part of the electronic whiteboard, avoid the operation of a user standing on a stool or a ladder and improve the safety of the user.

In order to solve the problems, the invention adopts the following technical scheme:

an erasing device of an electronic whiteboard comprises an electronic whiteboard main body, wherein a first limiting plate and a second limiting plate are fixedly connected to the front end of the electronic whiteboard main body, the second limiting plate is positioned at the right side of the first limiting plate, a first connecting plate is fixedly connected to the lower end of the first limiting plate, the second limiting plate is fixedly connected to the upper end of the first connecting plate, a servo motor is fixed to the lower end of the first connecting plate, the output end of the servo motor penetrates through the first connecting plate and is fixedly connected with a lead screw, a threaded ring is in threaded connection with the circumferential surface of the lead screw, a first sliding rod is fixedly connected to the left end of the threaded ring, a supporting plate is fixedly connected to the left end of the first sliding rod, a first sliding hole is formed in the right end of the second limiting plate, the first sliding rod is in sliding connection with the first sliding hole, and the supporting plate is in sliding connection between the first limiting plate and the second limiting plate, the upside of layer board is provided with coupling mechanism, the right-hand member fixedly connected with fourth connecting plate of whiteboard main part, the left end fixedly connected with electric telescopic handle of fourth connecting plate, the right-hand member of second limiting plate is dug there is the round hole, electric telescopic handle's output activity is pegged graft in the round hole, the right side of screw ring is provided with actuating mechanism, the upside of whiteboard main part is provided with tilting mechanism, be provided with elastic mechanism in the tilting mechanism, the upside of whiteboard main part is provided with magnetic force mechanism.

As a preferable scheme of the invention, the connecting mechanism includes a T-shaped block, a slider, a T-shaped hole, a third connecting plate, two insertion rods, an erasing device main body, a mounting groove and two fixing grooves, the T-shaped block is fixedly connected to the upper end of the supporting plate, the slider is located on the upper side of the supporting plate, the T-shaped hole is cut in the right end of the slider, the T-shaped block is slidably connected in the T-shaped hole, the third connecting plate is fixedly connected to the upper end of the slider, the two insertion rods are both fixedly connected to the front end of the third connecting plate, the erasing device main body is located on the front side of the third connecting plate, the mounting groove is cut in the rear end of the erasing device main body, the two fixing grooves are both cut in the front inner wall of the mounting groove, and the two.

As a preferable scheme of the present invention, the driving mechanism includes a fifth connecting plate, a rack, and a gear, the fifth connecting plate is fixedly connected to the right end of the threaded ring, the rack is fixedly connected to the rear end of the fifth connecting plate, and the gear is engaged with the rack.

As a preferred scheme of the invention, the turnover mechanism comprises two support plates, a rotating shaft, a rotating rod, a sixth connecting plate, a third limiting plate and a limiting sliding hole, wherein the two support plates are fixedly connected to the upper end of the electronic whiteboard main body, the rotating rod is rotatably connected to the right end of the left support plate through the rotating shaft, the rotating rod is rotatably connected in the right support plate, the sixth connecting plate is fixedly connected to the circumferential surface of the support plates, the third limiting plate is fixedly connected to the front end of the sixth connecting plate, the limiting sliding hole is drilled at the right end of the third limiting plate, the limiting sliding hole is matched with the erasing device main body, and the gear is fixedly connected to the right end of the rotating rod.

As a preferable scheme of the invention, the elastic mechanism includes a spring, a second slide rod, a push plate and a second slide hole, the second slide hole is drilled at the front end of the third limiting plate, the second slide rod is slidably connected in the second slide hole, the push plate is fixedly connected to the rear end of the second slide rod, the push plate is slidably connected in the limiting slide hole, the spring is fixedly connected to the left inner wall of the limiting slide hole, the right end of the spring is fixedly connected to the left end of the push plate, and the push plate is matched with the limiting slide hole.

As a preferable scheme of the present invention, the magnetic mechanism includes a fixing plate and two magnets, the fixing plate is fixedly connected to the upper end of the electronic whiteboard main body, the fixing plate is located at the rear side of the two supporting plates, both the two magnets are fixedly connected to the front end of the fixing plate, and both the two magnets are magnetically connected to the third limiting plate.

As a preferred scheme of the present invention, a second connecting plate is fixedly connected to the right end of the electronic whiteboard main body, a limiting ring is fixedly connected to the lower end of the second connecting plate, and the lead screw is rotatably connected to the limiting ring.

As a preferable scheme of the invention, the upper end of the supporting plate is fixedly connected with a baffle plate, the baffle plate is positioned on the right side of the T-shaped block, and the baffle plate is matched with the sliding block.

As a preferable scheme of the invention, the surface of the baffle plate is wrapped with the rubber sleeve, and the surface of the rubber sleeve is carved with the anti-skid grains.

As a preferable aspect of the present invention, the length of the first limiting plate is smaller than the length of the second limiting plate, and the sum of the lengths of the first limiting plate and the erasing apparatus main body is equal to the length of the second limiting plate.

Compared with the prior art, the invention has the advantages that:

(1) the invention opens a servo motor, the output end of the servo motor rotates to drive a screw rod to rotate, the screw rod rotates to drive a threaded ring to move upwards, the threaded ring drives a first slide rod to slide upwards in a first slide hole, a support plate moves upwards in a first limit plate and a second limit plate, the support plate drives an erasing device main body to move upwards, when the erasing device main body cannot move upwards continuously, the servo motor is closed, the threaded ring moves upwards to drive a fifth connecting plate to move upwards, the fifth connecting plate moves upwards to drive a rack to move upwards, the rack and a gear are meshed to drive a gear to rotate, the gear rotates to drive a rotating rod to rotate, the rotating rod rotates to drive a sixth connecting plate to rotate, the sixth connecting plate rotates to drive a third limit plate to rotate, the third limit plate and a magnet are separated until the third limit plate is positioned at the front end of an electronic whiteboard main body, an electric telescopic rod is opened, and the output end of the electric telescopic rod extends, the output end of the electric telescopic rod penetrates through the round hole to push the erasing device body to move leftwards, the erasing device body moves leftwards to drive the sliding block to move leftwards, the T-shaped block is separated from the T-shaped hole, the erasing device body moves leftwards to slide in the limiting sliding hole, the erasing device body pushes the pushing plate to move leftwards, the second sliding rod slides in the second sliding hole, the spring is compressed, the output end of the electric telescopic rod is shortened, the pushing plate is pushed to move rightwards under the elastic force reset of the spring, the pushing plate pushes the erasing device body to move rightwards, the erasing device body moves rightwards to enable the T-shaped block to slide into the T-shaped hole, the erasing device body stops moving after the sliding block is contacted with the baffle, the erasing device body erases the high part at the front end of the electronic whiteboard body, the servo motor is turned on again, the output end of the servo motor rotates reversely to drive the threaded ring to move downwards, and the threaded ring drives the fifth connecting plate to move downwards, the fifth connecting plate drives the rack to move downwards, the rack drives the gear to rotate in the direction, the rack drives the supporting plate to rotate reversely, the supporting plate drives the third limiting plate to rotate reversely, the third limiting plate is in contact with the magnet, the magnet sucks the third limiting plate to realize fixation of the third limiting plate, the rack continues to move downwards until the gear and the rack are separated, the threaded ring moves downwards to drive the first sliding rod to slide downwards in the first sliding hole, the supporting plate slides downwards between the first limiting plate and the second limiting plate, the erasing device main body slides downwards until the supporting plate is in contact with the upper end of the first connecting plate, and the servo motor is closed.

(2) When the part at the lower part of the electronic whiteboard main body needs to be erased, the erasing device main body is held by a hand, the erasing device main body moves forwards, the inserted link is separated from the fixed groove, the third connecting plate is separated from the mounting groove, the sliding block and the erasing device main body can be separated, the erasing device main body is taken to erase the part at the lower part of the electronic whiteboard main body, and the erasing device main body is put back to the original position after the erasing is finished.

Drawings

Fig. 1 is a perspective view of an erasing apparatus of an electronic whiteboard of the present invention;

fig. 2 is an exploded perspective view of an erasing apparatus of an electronic whiteboard according to the present invention;

fig. 3 is a perspective view of an erasing device spring of an electronic whiteboard of the present invention;

fig. 4 is a perspective view of a lead screw of an erasing device of an electronic whiteboard of the present invention;

fig. 5 is a perspective view of an erasing apparatus of an electronic whiteboard at a position of a limiting plate according to the present invention;

fig. 6 is a perspective view of an electronic whiteboard at a rack of an erasing apparatus of the present invention;

fig. 7 is a perspective view of an erasing apparatus slider of an electronic whiteboard of the present invention;

fig. 8 is a perspective view of the second limiting plate of the erasing apparatus of the electronic whiteboard of the present invention.

The reference numbers in the figures illustrate:

1. an electronic whiteboard main body; 2. a first limit plate; 3. a second limiting plate; 4. a first slide hole; 5. a first connecting plate; 6. a circular hole; 7. a support plate; 8. a rotating rod; 9. a fixing plate; 10. a magnet; 11. a rotating shaft; 12. a servo motor; 13. a screw rod; 14. a limiting ring; 15. a second connecting plate; 16. a slider; 17. a T-shaped hole; 18. a third connecting plate; 19. inserting a rod; 20. an erasing device main body; 21. mounting grooves; 22. a fourth connecting plate; 23. an electric telescopic rod; 24. a gear; 25. a rack; 26. a fifth connecting plate; 27. a threaded ring; 28. a first slide bar; 29. a support plate; 30. a T-shaped block; 31. a baffle plate; 32. pushing the plate; 33. a second slide bar; 34. a spring; 35. a third limiting plate; 36. a second slide hole; 37. a limiting slide hole; 38. and a sixth connecting plate.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

referring to fig. 1-8, an erasing apparatus for an electronic whiteboard includes an electronic whiteboard main body 1, a first limiting plate 2 and a second limiting plate 3 fixedly connected to a front end of the electronic whiteboard main body 1, and the second limiting plate 3 located at a right side of the first limiting plate 2, a first connecting plate 5 fixedly connected to a lower end of the first limiting plate 2, a second limiting plate 3 fixedly connected to an upper end of the first connecting plate 5, a servo motor 12 fixed to a lower end of the first connecting plate 5, an output end of the servo motor 12 penetrating the first connecting plate 5 and fixedly connected to a lead screw 13, a threaded ring 27 threadedly connected to a circumferential surface of the lead screw 13, a first sliding rod 28 fixedly connected to a left end of the threaded ring 27, a supporting plate 29 fixedly connected to a left end of the first sliding rod 28, a first sliding hole 4 bored at a right end of the second limiting plate 3, the first sliding rod 28 slidably connected to the first sliding hole 4, the supporting plate 29 slidably connected between the first limiting plate 2 and the second limiting plate 3, the upside of layer board 29 is provided with coupling mechanism, the right-hand member fixedly connected with fourth connecting plate 22 of whiteboard main part 1, the left end fixedly connected with electric telescopic handle 23 of fourth connecting plate 22, the right-hand member of second limiting plate 3 is opened and is chiseled there is round hole 6, electric telescopic handle 23's output activity is pegged graft in round hole 6, the right side of screw ring 27 is provided with actuating mechanism, the upside of whiteboard main part 1 is provided with tilting mechanism, be provided with elastic mechanism in the tilting mechanism, the upside of whiteboard main part 1 is provided with magnetic mechanism.

In this embodiment, the servo motor 12 is turned on, the output end of the servo motor 12 rotates to drive the screw rod 13 to rotate, the screw rod 13 rotates to drive the threaded ring 27 to move upward, the threaded ring 27 drives the first slide rod 28 to slide upward in the first slide hole 4, the support plate 29 moves upward in the first limit plate 2 and the second limit plate 3, the support plate 29 drives the erasing device main body 20 to move upward, when the erasing device main body 20 cannot move upward, the servo motor 12 is turned off, the threaded ring 27 moves upward to drive the fifth connecting plate 26 to move upward, the fifth connecting plate 26 moves upward to drive the rack 25 to move upward, the rack 25 and the gear 24 drive the gear 24 to rotate, the gear 24 rotates to drive the rotating rod 8 to rotate, the rotating rod 8 rotates to drive the sixth connecting plate 38 to rotate to drive the third limit plate 35 to rotate, the third limit plate 35 is disengaged from the magnet 10, until the third limiting plate 35 is located at the front end of the electronic whiteboard main body 1, the electric telescopic rod 23 is opened, the output end of the electric telescopic rod 23 extends, the output end of the electric telescopic rod 23 penetrates through the round hole 6 to push the erasing device main body 20 to move leftwards, the erasing device main body 20 moves leftwards to drive the sliding block 16 to move leftwards, the T-shaped block 30 is separated from the T-shaped hole 17, the erasing device main body 20 moves leftwards to slide in the limiting sliding hole 37, the erasing device main body 20 pushes the push plate 32 to move leftwards, the second sliding rod 33 slides in the second sliding hole 36, the spring 34 is compressed, the output end of the electric telescopic rod 23 shortens, the push plate 32 is pushed to move rightwards under the elastic force of the spring 34, the push plate 32 pushes the erasing device main body 20 to move rightwards, the erasing device main body 20 moves rightwards to slide the T-shaped block 30 into the T-shaped hole 17, and the erasing device main body 20 stops moving after the sliding block 16 and the baffle 31 are contacted, the erasing device body 20 is enabled to erase the high part at the front end of the electronic whiteboard body 1, the servo motor 12 is opened again, the output end of the servo motor 12 rotates reversely to drive the threaded ring 27 to move downwards, the threaded ring 27 drives the fifth connecting plate 26 to move downwards, the fifth connecting plate 26 drives the rack 25 to move downwards, the rack 25 drives the gear 24 to rotate in the direction of direction, the rack 25 drives the support plate 7 to rotate reversely, the support plate 7 drives the third limiting plate 35 to rotate reversely, the third limiting plate 35 is contacted with the magnet 10, the magnet 10 sucks the third limiting plate 35 to fix the third limiting plate 35, the rack 25 continues to move downwards until the gear 24 is separated from the rack 25, the threaded ring 27 moves downwards to drive the first slide bar 28 to slide downwards in the first slide hole 4, the supporting plate 29 slides downwards between the first limiting plate 2 and the second limiting plate 3, the erasing device body 20 slides downwards until the supporting plate 29 is contacted with the upper end of the first connecting plate 5, the servo motor 12 is turned off, and for those skilled in the art, the servo motor 12 and the electric telescopic rod 23 are both in the prior art and will not be described in detail.

Specifically, coupling mechanism includes T-shaped block 30, slider 16, T shape hole 17, third connecting plate 18, two inserted bars 19, erase device main part 20, mounting groove 21 and two fixed slots, T-shaped block 30 fixed connection is in the upper end of layer board 29, slider 16 is located the upside of layer board 29, T shape hole 17 cuts in the right-hand member of slider 16, T-shaped block 30 sliding connection is in T shape hole 17, third connecting plate 18 fixed connection is in the upper end of slider 16, two equal fixed connection of inserted bars 19 are in the front end of third connecting plate 18, it is located the front side of third connecting plate 18 to erase device main part 20, mounting groove 21 cuts in the rear end of erasing device main part 20, two fixed slots are all cut in the preceding inner wall of mounting groove 21, two inserted bars 19 are pegged graft in two fixed slots in the activity respectively.

In this embodiment, the T-shaped block 30 is inserted in the T-shaped hole 17 to prevent the slider 16 from moving up and down to separate the T-shaped block 30 from the slider 16, the erasing device body 20 is held by a hand, the erasing device body 20 moves forward, the insertion rod 19 is separated from the fixing groove, the third connecting plate 18 is separated from the mounting groove 21, the slider 16 and the erasing device body 20 can be separated, the erasing device body 20 is taken to erase the lower part of the electronic whiteboard body 1, and the erasing device body 20 is placed back after the erasing is finished.

Specifically, the driving mechanism comprises a fifth connecting plate 26, a rack 25 and a gear 24, the fifth connecting plate 26 is fixedly connected to the right end of the threaded ring 27, the rack 25 is fixedly connected to the rear end of the fifth connecting plate 26, and the gear 24 is engaged with the rack 25.

In this embodiment, the rack 25 drives the gear 24 to rotate to change the position of the third limiting plate 35, so that the erasing device body 20 slides in the limiting sliding hole 37 to erase the high part of the front end of the electronic whiteboard body 1, and the rack 25 drives the gear 24 to rotate, and only drives the rotating rod 8 to rotate ninety degrees from the beginning of meshing to the separation.

Specifically, tilting mechanism includes two backup pads 7, the pivot 11, the bull stick 8, sixth connecting plate 38, third limiting plate 35 and spacing slide opening 37, two equal fixed connection in the upper end of whiteboard main part 1 of backup pad 7, the bull stick 8 rotates through pivot 11 and connects in the right-hand member of left side backup pad 7, the bull stick 8 rotates and connects in right side backup pad 7, sixth connecting plate 38 fixed connection is in the circumferential surface of backup pad 7, third limiting plate 35 fixed connection is in the front end of sixth connecting plate 38, spacing slide opening 37 cuts in the right-hand member of third limiting plate 35, spacing slide opening 37 with erase device main part 20 phase-matches, gear 24 fixed connection is in the right-hand member of bull stick 8.

In this embodiment, become to erase the track that the device main part 20 removed from left and right through the rotatory back spacing slide opening 37 of third limiting plate 35, backup pad 7 is the bull stick 8 of being convenient for rotatory, and backup pad 7 can only be in pivot 11 internal rotation, and backup pad 7 can not break away from pivot 11, thereby the change of third limiting plate 35 position is realized in the rotation of the rotatory sixth connecting plate 38 that drives through bull stick 8.

Specifically, the elastic mechanism includes a spring 34, a second sliding rod 33, a pushing plate 32 and a second sliding hole 36, the second sliding hole 36 is cut at the front end of a third limiting plate 35, the second sliding rod 33 is slidably connected in the second sliding hole 36, the pushing plate 32 is fixedly connected at the rear end of the second sliding rod 33, the pushing plate 32 is slidably connected in a limiting sliding hole 37, the spring 34 is fixedly connected at the left inner wall of the limiting sliding hole 37, the right end of the spring 34 is fixedly connected at the left end of the pushing plate 32, and the pushing plate 32 is matched with the limiting sliding hole 37.

In this embodiment, the electric telescopic rod 23 pushes the erasing device main body 20 to move in the limiting sliding hole 37 to realize the movement of the push plate 32, the elastic reset of the spring 34 is used for pushing the erasing device main body 20 to move rightwards, the third limiting plate 35 is matched with the first limiting plate 2, the erasing device main body 20 slides in the limiting sliding hole 37 until the erasing device main body 20 is completely separated from the limiting sliding hole 37, the T-shaped block 30 is inserted in the T-shaped hole 17, and the sliding block 16 is prevented from being separated from the limiting sliding hole 37 and then cannot be reset with the T-shaped block 30.

Specifically, magnetic mechanism includes fixed plate 9 and two magnetite 10, and fixed plate 9 fixed connection is in the upper end of whiteboard main part 1, and fixed plate 9 is located the rear side of two backup pad 7, and the equal fixed connection of two magnetite 10 is in the front end of fixed plate 9, and the equal magnetism of two magnetite 10 is connected in third limiting plate 35.

In this embodiment, the third limiting plate 35 is located at the upper side of the electronic whiteboard main body 1 through the rotation of the third limiting plate 35, the position of the third limiting plate 35 is connected and fixed by the magnets 10 and the third limiting plate 35, the third limiting plate 35 is prevented from rotating accidentally, the position of the third limiting plate 35 can be fixed by the magnetic force of the two magnets 10, and the magnets 10 and the third limiting plate 35 can be separated by the movement of the rack 25 which drives the gear 24 to rotate.

Specifically, the right end of the electronic whiteboard main body 1 is fixedly connected with a second connecting plate 15, the lower end of the second connecting plate 15 is fixedly connected with a limiting ring 14, and the screw rod 13 is rotatably connected in the limiting ring 14.

In this embodiment, the second connecting plate 15 is beneficial to fixing the position of the limiting ring 14, and the limiting ring 14 is beneficial to preventing the screw 13 from moving forward, backward, leftward and rightward, and preventing the gear 24 from being incapable of meshing with the rack 25 due to the forward, backward, leftward and rightward movement of the rack 25.

Specifically, the upper end of the supporting plate 29 is fixedly connected with a baffle 31, the baffle 31 is positioned on the right side of the T-shaped block 30, and the baffle 31 is matched with the sliding block 16.

In this embodiment, the baffle 31 is beneficial to prevent the slider 16 and the T-block 30 from being dislocated when the slider 16 is pushed back to the right by the push plate 32.

Specifically, the surface of the baffle 31 is wrapped with a rubber sleeve, and the surface of the rubber sleeve is carved with anti-slip lines.

In this embodiment, the rubber sleeve and the anti-slip pattern are provided with and are good for carrying out the shock attenuation to slider 16, prevent that slider 16 from striking baffle 31 and then moving left.

Specifically, the length of the first limiting plate 2 is smaller than that of the second limiting plate 3, and the sum of the lengths of the first limiting plate 2 and the erasing device main body 20 is equal to that of the second limiting plate 3.

In this embodiment, the length of the first limiting plate 2 is smaller than that of the second limiting plate 3, so that the erasing device main body 20 moves leftwards and enters the limiting sliding hole 37.

The working principle is as follows: the servo motor 12 is opened, the output end of the servo motor 12 rotates to drive the screw rod 13 to rotate, the screw rod 13 rotates to drive the threaded ring 27 to move upwards, the threaded ring 27 drives the first slide rod 28 to slide upwards in the first slide hole 4, the supporting plate 29 moves upwards in the first limiting plate 2 and the second limiting plate 3, the supporting plate 29 drives the erasing device main body 20 to move upwards, when the erasing device main body 20 cannot move upwards continuously, the servo motor 12 is closed, the threaded ring 27 moves upwards to drive the fifth connecting plate 26 to move upwards, the fifth connecting plate 26 moves upwards to drive the rack 25 to move upwards, the rack 25 and the gear 24 are meshed to drive the gear 24 to rotate, the gear 24 rotates to drive the rotating rod 8 to rotate, the rotating rod 8 rotates to drive the sixth connecting plate 38 to rotate to drive the third limiting plate 35 to rotate, the third limiting plate 35 is separated from the magnet 10 until the third limiting plate 35 is positioned at the front end of the electronic whiteboard main body 1, the electric telescopic rod 23 is opened, the output end of the electric telescopic rod 23 extends, the output end of the electric telescopic rod 23 penetrates through the round hole 6 to push the erasing device main body 20 to move leftwards, the erasing device main body 20 moves leftwards to drive the sliding block 16 to move leftwards, the T-shaped block 30 is separated from the T-shaped hole 17, the erasing device main body 20 moves leftwards to slide in the limiting sliding hole 37, the erasing device main body 20 pushes the push plate 32 to move leftwards, the second sliding rod 33 slides in the second sliding hole 36, the spring 34 is compressed, the output end of the electric telescopic rod 23 is shortened, the push plate 32 is pushed to move rightwards under the elastic force reset of the spring 34, the push plate 32 pushes the erasing device main body 20 to move rightwards, the erasing device main body 20 moves rightwards to enable the T-shaped block 30 to slide into the T-shaped hole 17, the erasing device main body 20 stops moving after the sliding block 16 and the baffle 31 are contacted, and the erasing device main body 20 erases the high part of the front end of the electronic whiteboard main body 1, the servo motor 12 is opened again, the output end of the servo motor 12 rotates reversely to drive the threaded ring 27 to move downwards, the threaded ring 27 drives the fifth connecting plate 26 to move downwards, the fifth connecting plate 26 drives the rack 25 to move downwards, the rack 25 drives the gear 24 to rotate in the direction, the rack 25 drives the supporting plate 7 to rotate reversely, the supporting plate 7 drives the third limiting plate 35 to rotate reversely, the third limiting plate 35 is in contact with the magnet 10, the magnet 10 sucks the third limiting plate 35 to fix the third limiting plate 35, the rack 25 continues to move downwards until the gear 24 and the rack 25 are separated, the threaded ring 27 moves downwards to drive the first sliding rod 28 to slide downwards in the first sliding hole 4, the supporting plate 29 slides downwards between the first limiting plate 2 and the second limiting plate 3, the erasing device main body 20 slides downwards until the supporting plate 29 is in contact with the upper end of the first connecting plate 5, and the servo motor 12 is closed.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the equivalent replacement or change according to the technical solution and the modified concept of the present invention should be covered by the scope of the present invention.