阅读说明：本技术 一种教学用教学板 (Teaching board for teaching ) 是由 王磊 曲佳 商香华 刘肖群 徐传志 申荣亮 徐乾翕 徐浩 于 2021-09-04 设计创作，主要内容包括：本发明属于教学用具技术领域,尤其是一种教学用教学板,针对现有技术中经常用力擦黑板导致黑板粗糙度被磨损影响不同角度观看质量的问题,现提出以下方案,包括内设空腔呈长方体结构的配重底座,且配重底座的上表面设置有两个开口相对呈条形盆状结构的上盖和下盖,且上盖和下盖之间位于两端处分别转动连接有互相平行的传动辊,两个传动辊的辊身外壁之间位于上下两端处均缠绕有传送带,两根传送带远离传动辊的一侧中部均固定有连杆,位于上盖的左右两侧均通过连杆固定有教学板本体,两个教学板本体的板面始终互相平行。本发明可以在需要对棉布块加湿的时候只需不断的按压板擦侧面的顶杆即可,方便又隐蔽,润湿后的棉布块更容易进行擦拭。(The invention belongs to the technical field of teaching tools, in particular to a teaching board for teaching, which aims at solving the problem that blackboard roughness is abraded to influence the viewing quality at different angles due to the fact that a blackboard is frequently erased forcibly in the prior art, and the teaching board comprises a counterweight base with a cuboid-shaped cavity, wherein the upper surface of the counterweight base is provided with an upper cover and a lower cover with two opposite strip-shaped basin-shaped openings, transmission rollers which are parallel to each other are respectively and rotatably connected between the upper cover and the lower cover at two ends, conveyor belts are wound between the outer walls of roller bodies of the two transmission rollers at the upper end and the lower end, connecting rods are respectively fixed at the middle parts of one sides of the two conveyor belts far away from the transmission rollers, teaching board bodies are respectively fixed at the left side and the right side of the upper cover through the connecting rods, and the board surfaces of the two teaching board bodies are always parallel to each other. The cotton cloth piece humidifying device can humidify the cotton cloth piece only by continuously pressing the ejector rods on the side face of the eraser, is convenient and concealed, and the wetted cotton cloth piece is easier to clean.)

1. The teaching board for teaching comprises a counterweight base (1) with a cuboid-shaped structure and a cavity arranged therein, wherein the upper surface of the counterweight base (1) is provided with an upper cover (14) and a lower cover (21) which have opposite openings and are in a strip basin-shaped structure, two parallel transmission rollers (9) are respectively rotatably connected between the upper cover (14) and the lower cover (21) at two ends, conveyor belts (20) are respectively wound at the upper end and the lower end between the outer walls of the roller bodies of the two transmission rollers (9), the middle parts of one sides of the two conveyor belts (20) far away from the transmission rollers (9) are respectively fixed with a connecting rod (17), teaching board bodies (19) are respectively fixed at the left side and the right side of the upper cover (14) through the connecting rods (17), the board surfaces of the two teaching board bodies (19) are always parallel to each other, the teaching board is characterized in that a board eraser (2) is arranged on the upper surface of the counterweight base (1), and the board eraser (2) is of the cuboid-shaped structure with the cavity arranged therein, a partition board is fixed in the middle of the blackboard eraser (2) close to one end of the blackboard eraser (2), the partition board divides a cavity of the blackboard eraser (2) into a sealed water bin and a pressurizing bin, a piston cylinder (206) with a cylindrical structure and a cavity is embedded in the middle of the pressurizing bin on the side surface of the blackboard eraser (2), a piston disc is connected in the piston cylinder (206) in a sliding mode, a push rod (207) and a compression spring (205) are fixed on two sides of the piston disc respectively, an air charging pipe (204) is inserted into one end, far away from the push rod (207), of the piston cylinder (206), a check valve (203) is arranged in the middle of the air charging pipe (204), a cotton cloth block (209) is arranged on the side surface of the blackboard eraser (2), a water conveying pipe (202) is fixed on the partition board, and the outlet end of the water conveying pipe (202) penetrates through the blackboard eraser (2) at the pressurizing bin and is inserted into the cotton cloth block (209).

2. The teaching board as claimed in claim 1, wherein rectangular holes are formed in the two opposite sides of the counterweight base (1) near the four corners, guide pipes are inserted into the rectangular holes, extension rods (27) are slidably connected into the guide pipes, and universal wheels with brakes are fixed at the ends of the lower surfaces of the four extension rods (27) far away from the counterweight base (1).

3. The teaching board according to claim 1, wherein the middle part of the upper surface of the counterweight base (1) is fixed with a support rod (3) near the left edge, the bottom end of the support rod (3) is fixed with a triangular rib plate, the top end of the support rod (3) is fixed with a cylindrical rotating rod (4) which is vertically and horizontally placed, and the lower surface of the lower cover (21) is positioned right above the support rod (3) and is embedded with a cylindrical clamping seat (5) which is matched with the cylindrical rotating rod (4).

4. The teaching board for teaching according to claim 3, wherein a round hole is formed in one side of the middle of the upper surface of the counterweight base (1) far away from the support column (3), a limiting snap ring (25) is fixed on the inner wall of the bottom of the counterweight base (1) under the round hole, a same vertically-placed internal threaded pipe (24) is rotatably connected between the round hole and the limiting snap ring (25), an adjusting screw (22) is rotatably connected to the inner wall of the internal threaded pipe (22), the top end of the adjusting screw (22) is hinged to the lower surface of the lower cover (21), mutually-symmetrical rotating discs (26) are respectively fixed on the upper surface of the counterweight base (1) and the lower surface of the limiting snap ring (25) on the outer circumferential wall of the internal threaded pipe (24), and balls are embedded on one side of the two rotating discs (26) opposite to the edge of the circumference.

5. The teaching board according to claim 4, wherein the outer wall of the internal threaded pipe (24) is fixed with the shifting rods (2401) distributed at equal intervals, the circumferential outer wall of the adjusting screw (22) is in threaded connection with the locking nut ring (23) at the top end of the internal threaded pipe (24), and the top end of the shifting rod (2401) is provided with the hinged block.

6. The teaching board as claimed in claim 1, wherein the speed reduction motor (6) is fixed to the bottom inner wall of the lower cover (21), the driving gear (8) is fixed to the top end of the output shaft of the speed reduction motor (6), the driven gear ring (7) meshed with the driving gear (8) is sleeved on the circumferential outer wall of the driving roller (9) close to the driving gear (8) and close to the bottom end, the arm lever (15) is fixed to the middle of the upper surface of the upper cover (14), and the end of the arm lever (15) is rotatably connected with the dryer (16).

7. The teaching board as claimed in claim 1, wherein two sides of the opposite side of the two teaching board bodies (19) near the top end are fixed with limit blocks (11), and the surface of the upper cover (14) near the two sides is provided with mounting holes (1401), the mounting holes (1401) are clamped with limit boxes (12), one side of the limit boxes (12) near the limit blocks (11) is provided with jacks matched with the diameter of the limit blocks (11), and the inside of the limit boxes (12) is fixed with magnets (1201).

8. The teaching board as claimed in claim 1, wherein a slide rail (2010) is fixed to the lower surface of the board eraser (2), the cotton cloth block (209) is slidably connected to the slide rail (2010), a strip-shaped hole matched with the position of the water pipe (202) is formed in the slide rail (2010), and a gravity ball (201) is fixed to one end, far away from the partition plate, of the water pipe (202).

9. The teaching board as claimed in claim 1, wherein the two opposite sides of the teaching board body (19) near the top end are fixed with pull rings (1901).

Technical Field

The invention relates to the technical field of teaching aids, in particular to a teaching board for teaching.

Background

The teaching board is a teaching device commonly used in teaching at present, and provides great convenience for preparing lessons and teaching for teachers because of mobility and portability. The teacher can write the main contents to be spoken in class on the movable teaching board in advance, so that the time for writing on the board in class is saved, and the class teaching efficiency is improved. Currently, the teaching boards used have major limitations.

The combined push-pull type teaching board disclosed by the retrieved Chinese patent No. CN201922386621.9 comprises a teaching board assembly board, wherein the teaching board assembly board is a cuboid frame body, a display screen is arranged in the middle of one end of the teaching board assembly board, the outer side of the display screen is wrapped and buckled with a display screen protection frame, a first teaching board and a second teaching board are arranged on one side of the display screen protection frame, and a third teaching board and a fourth teaching board are arranged on the other side of the display screen protection frame; although this teaching board has set up a plurality of teaching boards that can replace the use each other, once only can write many contents as much as possible, still can not change and need to wipe blackboard fortune, in case wipe the blackboard will involve wiping totally or not, because frequency and dynamics that the blackboard was used all can influence the quality of watching of writing next time, wipe the roughness that can reduce the blackboard vigorously for a long time for the student on both sides watches and gets up easily the reflection of light, consequently just needs a novel teaching board of being convenient for to clean.

Disclosure of Invention

The invention provides a teaching board for teaching, aiming at solving the problem that the roughness of a blackboard is worn to influence the viewing quality at different angles due to the fact that the blackboard is frequently erased forcibly in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: a teaching board for teaching comprises a counterweight base with a cuboid-shaped cavity, wherein the upper surface of the counterweight base is provided with an upper cover and a lower cover with opposite openings and a strip-shaped basin-shaped structure, two parallel transmission rollers are respectively and rotatably connected between the upper cover and the lower cover at two ends, transmission belts are respectively wound at the upper end and the lower end between the outer walls of the roller bodies of the two transmission rollers, a connecting rod is fixed at the middle part of one side of each of the two transmission belts away from the transmission rollers, teaching board bodies are fixed at the left side and the right side of the upper cover through the connecting rods, the board surfaces of the two teaching board bodies are always parallel to each other, an eraser is placed on the upper surface of the counterweight base and is of a cuboid-shaped structure with a cavity inside, a partition board is fixed at one end of the middle of the eraser, the partition board divides the cavity of the eraser into a sealed water bin and a pressurizing bin, and a piston cylinder with a cylindrical cavity inside is arranged in the middle of the side of the eraser, and a piston disc is connected in the piston cylinder in a sliding manner, a push rod and a compression spring are respectively fixed on two sides of the piston disc, an inflation tube is inserted into one end, away from the push rod, of the piston cylinder, a one-way valve is arranged in the middle of the inflation tube, a cotton cloth block is arranged on the side face of the blackboard eraser, a water delivery tube is fixed on the partition plate, the outlet end of the water delivery tube penetrates through the blackboard eraser at a pressurizing bin and is inserted into the cotton cloth block, gas in the piston cylinder is continuously compressed through the push rod, the gas can be continuously pressurized for a water bin below the partition plate through the inflation tube and the one-way valve, and then the push rod on the side face of the blackboard eraser can be continuously pressed when the cotton cloth block needs to be humidified, so that the cotton cloth block is convenient and concealed, and the wetted cotton cloth block is easier to be wiped.

According to the preferable scheme, rectangular holes are formed in two opposite sides of the counterweight base close to four corners, guide pipes are inserted in the rectangular holes, extension rods are connected in the guide pipes in a sliding mode, and universal wheels with brakes are fixed at one ends, far away from the counterweight base, of the lower surfaces of the four extension rods, so that the extension rods with different lengths can be drawn out according to the forward-tilting angle of the teaching board body, the gravity center of the device falls in an effective bearing surface, the stability of the device is improved, and the device is convenient to move.

As a preferable scheme in the invention, a support rod is fixed at the middle part of the upper surface of the counterweight base close to the left edge, a triangular rib plate is fixed at the bottom end of the support rod, a cylindrical rotating rod which is longitudinally and horizontally arranged is fixed at the top end of the support rod, and a cylindrical clamping seat which is matched with the cylindrical rotating rod is embedded at the lower surface of the lower cover right above the support rod, so that the elevation angle of the lower cover and a teaching board body at the top end of the lower cover can be changed to a certain extent when the lower cover is used, the board can look right at students below a platform as far as possible, the eyesight of the students is protected to the greatest extent, and the possibility of light reflection can be reduced.

As a preferable scheme in the invention, a round hole is formed in one side of the middle part of the upper surface of the counterweight base, which is far away from the support column, a limiting snap ring is fixed on the inner wall of the bottom of the counterweight base, which is positioned under the round hole, a same vertically-arranged internal thread pipe is rotatably connected between the round hole and the limiting snap ring, the inner wall of the internal thread pipe is rotatably connected with an adjusting screw rod, the top end of the adjusting screw rod is hinged to the lower surface of the lower cover, mutually-symmetrical rotating discs are respectively fixed on the circumferential outer wall of the internal thread pipe, which is positioned on the upper surface of the counterweight base and the lower surface of the limiting snap ring, and balls are embedded on one side, which is opposite to the two rotating discs, close to the circumferential edge.

According to the preferred scheme of the invention, the poke rods distributed at equal intervals are fixed on the outer wall of the internal thread pipe, the locking nut ring is screwed at the top end of the internal thread pipe on the circumferential outer wall of the adjusting screw rod, and the hinged block is arranged at the top end of the poke rod, so that the elevation angle of the lower cover can be adjusted by rotating the poke rod when the adjusting screw rod is used.

According to the preferable scheme, the inner wall of the bottom of the lower cover is fixed with the speed reducing motor, the top end of an output shaft of the speed reducing motor is fixed with the driving gear, the peripheral outer wall of the transmission roller close to the driving gear is sleeved with the driven gear ring meshed with the driving gear close to the bottom end, the middle of the upper surface of the upper cover is fixed with the arm rod, and the end part of the arm rod is rotatably connected with the dryer, so that the wet and percolated board surface after being wiped can be quickly dried.

As a preferable scheme in the teaching board, two sides, close to the top end, of opposite sides of the two teaching board bodies are respectively fixed with a limiting block, mounting holes are formed in the surface of the upper cover, close to the two sides, of the upper cover, limiting boxes are clamped in the mounting holes, jacks matched with the limiting blocks in diameter are formed in one sides, close to the limiting blocks, of the limiting boxes, and magnets are fixed inside the limiting boxes, so that when the teaching board is used, when the teaching board body runs to the front side, two ends of the teaching board body can be automatically clamped and adsorbed on the surface of the limiting boxes, and the surface of the teaching board body is improved.

According to the preferred scheme, the sliding rail is fixed on the lower surface of the blackboard eraser, the cotton cloth block is connected in the sliding rail in a sliding mode, the sliding rail is provided with the strip-shaped hole matched with the position of the water delivery pipe, and the gravity ball is fixed at one end, far away from the partition plate, of the water delivery pipe, so that when the blackboard eraser is used and used vertically wiped, the water inlet end of the water delivery pipe is always located at the water bottom, water absorption can be guaranteed, and the strip-shaped hole is formed to enable the water delivery pipe to penetrate through the cotton cloth block and convey water to the surface of the cotton cloth block.

As the preferable scheme in the invention, the pull rings are fixed on the two opposite sides of the two teaching board bodies near the middle part of the top end, when the teaching board bodies need to be switched, the limit blocks of the teaching board bodies can be pulled out from the jacks in the limit box only by pulling the pull rings outwards, and the stretching is convenient and labor-saving.

To sum up, the beneficial effect in this scheme is:

1. according to the teaching board for teaching, the pressurizing bin and the water bin which are separated by the partition plate are arranged, and the gas in the continuously compressed piston cylinder matched with the ejector rod can be used for continuously pressurizing the water bin below the partition plate through the inflation tube and the one-way valve, so that the ejector rod on the side surface of the board eraser can be continuously pressed when a cotton cloth block needs to be humidified, convenience and concealment are realized, and the wetted cotton cloth block can be easily wiped;

2. according to the teaching board for teaching, the cylindrical clamping seat embedded on the lower surface of the lower cover is arranged to be matched with the cylindrical rotating rod, so that the adjusting screw rod hinged to the lower surface of the lower cover can move up and down, the elevation angle of the lower cover and the teaching board body at the top end of the lower cover can be changed to a certain extent when the teaching board is used, the board surface looks at students below a platform as far as possible, the eyesight of the students is protected to the greatest extent, and the possibility of light reflection can be reduced;

3. according to the teaching board for teaching, the limiting boxes and the iron limiting blocks on the two sides of the teaching board body are arranged, so that when the teaching board is used, the two ends of the teaching board body can be automatically clamped and adsorbed on the surface of the limiting boxes when the teaching board body runs to the front side, and the surface of the teaching board body is improved;

4. this kind of teaching board is used in teaching through setting up the gravity ball in the conveyer pipe bottom, can be when using, when the vertical cleaning of blackboard eraser, ensures that the end of intaking of raceway is located the bottom of water department all the time, ensures to absorb water, and the bar hole of seting up is convenient for the raceway and passes the surface of carrying water to the cotton cloth piece.

Drawings

FIG. 1 is a schematic cross-sectional view of a teaching board for teaching according to the present invention;

FIG. 2 is a schematic view of an assembly structure of a teaching board body of the teaching board for teaching according to the present invention;

FIG. 3 is an enlarged schematic view of a teaching board of FIG. 1;

FIG. 4 is a schematic perspective view of a blackboard eraser of a teaching board according to the present invention;

FIG. 5 is a schematic cross-sectional view of a teaching blackboard eraser for teaching according to the present invention;

fig. 6 is a schematic view of an assembly structure of the teaching blackboard eraser for teaching according to the present invention.

In the figure: 1 counter weight base, 2 board wipers, 201 gravity ball, 202 water pipe, 203 one-way valve, 204 gas-filled pipe, 205 compression spring, 206 piston cylinder, 207 ejector rod, 208 slide block, 209 cotton block, 2010 slide rail, 3 support rod, 4 cylinder rotating rod, 5 cylinder clamping seat, 6 reduction motor, 7 driven gear ring, 8 driving gear, 9 driving roller, 10 annular retainer ring, 11 limiting block, 12 limiting box, 1201 magnet, 13 bearing seat, 14 upper cover, 1401 mounting hole, 15 arm rod, 16 dryer, 17 connecting rod, 18 support column, 19 teaching board body, 1901 pull ring, 20 conveyor belt, 21 lower cover, 22 adjusting screw, 23 locking nut ring, 24 internal threaded pipe, 2401 poking rod, 25 limiting retainer ring, 26 rotating disk, 27 extension rod.

Detailed Description

The technical solutions 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, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Example 1

Referring to fig. 1-6, a teaching board for teaching comprises a counterweight base 1 with a rectangular structure cavity therein, wherein the upper surface of the counterweight base 1 is provided with an upper cover 14 and a lower cover 21 with opposite openings in a strip basin-shaped structure, two parallel transmission rollers 9 are respectively rotatably connected between the upper cover 14 and the lower cover 21 at two ends, a transmission belt 20 is wound between the outer walls of the roller bodies of the two transmission rollers 9 at the upper end and the lower end, the transmission belt 20 is made of rubber material and has certain toughness, a connecting rod 17 is fixed in the middle of one side of each of the two transmission belts 20 far away from the transmission rollers 9, teaching board bodies 19 are fixed on the left side and the right side of the upper cover 14 through the connecting rod 17, the board surfaces of the two teaching board bodies 19 are always parallel to each other, a board eraser 2 is placed on the upper surface of the counterweight base 1, the board eraser 2 is of a rectangular structure with a cavity therein, and a partition board is fixed in the middle of the board eraser 2 near one end thereof, the cavity of the blackboard eraser 2 is divided into a sealed water bin and a pressurizing bin by a partition plate, a piston cylinder 206 with a cylindrical structure and a cavity is embedded in the middle of the pressurizing bin on the side surface of the blackboard eraser 2, a piston disc is connected in the piston cylinder 206 in a sliding manner, a push rod 207 and a compression spring 205 are respectively fixed on two sides of the piston disc, an inflation tube 204 is inserted into one end of the piston cylinder 206 far away from the push rod 207, a one-way valve 203 is arranged in the middle of the inflation tube 204, a cotton cloth block 209 is arranged on the side surface of the blackboard eraser 2, a water conveying pipe 202 is fixed on the partition plate, the outlet end of the water conveying pipe 202 penetrates through the blackboard eraser 2 at the pressurizing bin and is inserted into the cotton cloth block 209, gas in the piston cylinder 206 is continuously compressed by the push rod 207, the water bin below the partition plate can be continuously pressurized by the inflation tube 204 and the one-way valve 203, and then the push rod 207 on the side surface of the blackboard eraser 2 can be continuously pressed when the cotton cloth block 209 needs to be humidified, convenient and concealed, and the wetted cotton cloth 209 is easier to wipe.

In the invention, rectangular holes are formed in two opposite sides of the counterweight base 1 close to four corners, guide pipes are inserted in the rectangular holes, extension rods 27 are connected in the guide pipes in a sliding manner, and universal wheels with brakes are fixed at one ends of the lower surfaces of the four extension rods 27 far away from the counterweight base 1, so that the extension rods 27 with different lengths can be drawn out according to the forward-tilting angle of the teaching board body 19, the gravity center of the device falls in an effective bearing surface, the stability of the device is improved, and the device is more convenient to move.

Wherein, the upper surface middle part of counter weight base 1 is close to left side edge and is fixed with bracing piece 3, and the bottom end rigidity of bracing piece 3 has the triangle gusset, the top of bracing piece 3 is fixed with vertical level and places cylinder bull stick 4, and the lower surface of lower cover 21 is located bracing piece 3 and inlays directly over and be equipped with the cylinder cassette 5 with 4 looks adaptations of cylinder bull stick, thereby can let lower cover 21 and the elevation angle of the teaching board body 19 on its top can have certain change when using, make the face look as far as possible with the student below the podium, furthest protects student's eyesight, also can reduce the possibility of reflection of light.

Wherein, one side that support column 3 was kept away from at counter weight base 1's upper surface middle part is opened there is the round hole, and counter weight base 1's bottom inner wall is located the round hole and is fixed with spacing snap ring 25 under, and rotate between round hole and the spacing snap ring 25 and be connected with the internal thread pipe 24 of same vertical placing, and the inner wall of internal thread pipe 22 rotates and is connected with adjusting screw 22, adjusting screw 22's top articulates the lower surface at lower cover 21, the circumference outer wall of internal thread pipe 24 is located counter weight base 1's upper surface and the lower surface of spacing snap ring 25 is fixed with the rolling disc 26 of symmetry of each other respectively, and two relative one sides of rolling disc 26 are close to circumference edge and all inlay and are equipped with the ball.

Wherein, the external wall of internal thread pipe 24 is fixed with the poker rod 2401 that the equidistance distributes, and the circumference outer wall of adjusting screw 22 is located the top spiro union of internal thread pipe 24 and has locked nut ring 23, and the top of poker rod 2401 is provided with articulated piece to can stir the rotation of poker rod 2401 and can adjust the angle of elevation of lower cover 21 when using.

Wherein, the bottom inner wall of lower cover 21 is fixed with gear motor 6, and gear motor 6's output shaft top is fixed with driving gear 8, and the circumference outer wall that is close to driving gear 9 of 8 departments of driving gear is close to the bottom and cup joints driven gear ring 7 with driving gear 8 intermeshing, and the upper surface middle part of upper cover 14 is fixed with armed lever 15, and the tip of armed lever 15 rotates and is connected with drying-machine 16, can air-dry fast the face of wiping the wet colation of back surface.

Wherein, the both sides that two teaching board bodies 19 are relative one side is close to the top all are fixed with stopper 11, and the surface of upper cover 14 is close to both sides and all opens there is mounting hole 1401, equal joint has spacing box 12 in the mounting hole 1401, and spacing box 12 is close to one side of stopper 11 and opens the jack that has 11 diameter looks adaptations of stopper, the inside of spacing box 12 is fixed with magnet 1201, thereby can be when using, when teaching board body 19 moves to positive its both ends can be automatic joint adsorb on the surface of spacing box 12, improve the surface of teaching board body 19.

Wherein, the lower fixed surface of blackboard eraser 2 has slide rail 2010, and cotton cloth piece 209 sliding connection is in slide rail 2010, it has the bar hole with raceway 202 position looks adaptation to open on the slide rail 2010, the one end that the baffle was kept away from to raceway 202 is fixed with gravity ball 201, thereby can be when using, when the vertical wiping of blackboard eraser, ensure that the end of intaking of raceway 202 is located the bottom of water department all the time, ensure to absorb water, the bar hole of seting up is convenient for raceway 202 to pass the surface of carrying water to cotton cloth piece 209.

Wherein, the both sides that two teaching board bodies 19 carried on the back mutually all are fixed with pull ring 1901 near the top middle part, when needs will teach board body 19 switching position, only need outwards draw pull ring 1901 and can drag out the stopper 11 of teaching board body 19 from the jack in spacing box 12, and it is tensile convenient laborsaving.

The working principle is as follows: when the teaching board is used, the teaching board body 19 to be written is firstly rotated to the central position of the front surface, and when the limiting block 11 is heard to be adsorbed and inserted into the limiting box 12, a click sound is heard, namely the surface teaching board body 19 moves in place; then writing can be carried out; when the elevation angle of the teaching board body 19 needs to be adjusted, the internal threaded pipe 24 can be driven to rotate only by rotating the poking rod 2401, and then the adjusting screw 22 screwed in the internal threaded pipe 24 is controlled to vertically ascend, and at the moment, the lower cover 21 can rotate around the axis of the cylindrical rotating rod 4;

when the board surface needs to be wiped later, the gas in the piston cylinder 206 is continuously compressed by the ejector rod 207, so that the water bin below the partition plate can be continuously pressurized by the inflation tube 204 and the one-way valve 203, the ejector rod 207 on the side surface of the board wiper 2 can be continuously pressed when the cotton cloth 209 needs to be humidified, the board surface is convenient and concealed, and the wet cotton cloth 209 is easier to wipe.

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 technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.