阅读说明：本技术 一种数学模型演示教具 (Mathematical model demonstration teaching aid ) 是由 龙志文 豆振江 邱波蔚 谢朝阳 于 2021-01-14 设计创作，主要内容包括：本发明属于数学模型演示教具技术领域,具体的说是一种数学模型演示教具,包括模型面板；模型面板的顶部固定设有提手；模型面板的正面开设有安装槽；安装槽的内部固定设有书写板；书写板的表面绘制有坐标系；坐标系上绘制有刻度线；书写板的正面活动设有椭圆环；本发明采用已经成型好的椭圆环,通过连接杆可带动椭圆环在竖直平面内转动,进而当连接杆位于坐标系的X轴时,椭圆环所形成的曲线为焦点在X轴上的标准椭圆曲线方程,而当连接杆转动至Y轴时,椭圆环所形成的曲线为焦点在Y轴上的椭圆曲线方程,此时可在书写板表面的椭圆环的相应位置以及在坐标系上标注出已知的参数,便于下一步的求解,有助于学生对求解过程的理解。(The invention belongs to the technical field of mathematical model demonstration teaching aids, and particularly relates to a mathematical model demonstration teaching aid which comprises a model panel; a handle is fixedly arranged at the top of the model panel; the front side of the model panel is provided with a mounting groove; a writing board is fixedly arranged inside the mounting groove; a coordinate system is drawn on the surface of the writing board; scale lines are drawn on the coordinate system; the front surface of the writing board is movably provided with an elliptical ring; the formed elliptical rings are adopted, the elliptical rings can be driven to rotate in a vertical plane through the connecting rods, further, when the connecting rods are located on an X axis of a coordinate system, a curve formed by the elliptical rings is a standard elliptical curve equation with a focus on the X axis, and when the connecting rods rotate to a Y axis, a curve formed by the elliptical rings is an elliptical curve equation with a focus on the Y axis, at the moment, known parameters can be marked on the corresponding positions of the elliptical rings on the surface of the writing board and on the coordinate system, so that the next step of solution is facilitated, and students can understand the solution process.)

1. The utility model provides a mathematical model demonstration teaching aid which characterized in that: comprising a model panel (1); a handle (29) is fixedly arranged at the top of the model panel (1); the front surface of the model panel (1) is provided with a mounting groove (26); a writing board (5) is fixedly arranged in the mounting groove (26); a coordinate system (2) is drawn on the surface of the writing board (5); scale marks are drawn on the coordinate system (2); the front surface of the writing board (5) is movably provided with an elliptical ring (4); a connecting rod (3) is fixedly arranged at the position of the long shaft on the elliptical ring (4); the length of the connecting rod (3) is greater than that of the long axis of the elliptical ring (4); the middle part of the connecting rod (3) is movably connected with the surface of the writing board (5) through a rotating column (27), and the rotating column (27) is positioned at the origin of the coordinate system (2); the rotating column (27) is fixedly connected with the middle part of the connecting rod (3); the inner side end of the rotating column (27) extends into a power cavity (16) in the writing board (5) and is fixedly connected with a rotating shaft of the accelerating circular gear (17); the other rotating shaft of the accelerating circular gear (17) is movably connected to the inner wall of the power cavity (16); a driving circular gear (19) is movably arranged in the power cavity (16) below the accelerating circular gear (17); a rotating shaft positioned at the rear side of the driving circular gear (19) is movably connected to the inner wall of the power cavity (16), and the surface of the rotating shaft positioned at the front side of the driving circular gear (19) extending out of the model panel (1) is fixedly connected with the central position of the inner side surface of the turntable (7); poke rods (8) are uniformly arranged at the edge of the turntable (7); the accelerating circular gear (17) is in transmission connection with the driving circular gear (19) through a gear belt (18); when the turntable (7) rotates, the elliptical ring (4) and the connecting rod (3) rotate around the origin of the coordinate system (2) in a vertical plane; a pen container (6) is fixedly arranged at the position, close to the lower part, of the front surface of the model panel (1); the inner side surface of the connecting rod (3) is provided with a cleaning cotton pad (20) for cleaning the surface of the writing board (5).

2. A mathematical model demonstration teaching aid according to claim 1, characterized in that: the cleaning cotton pad (20) is adhered to the surface of the T-shaped sliding block (23); the T-shaped sliding block (23) is movably inserted into the T-shaped sliding groove (22); the T-shaped sliding groove (22) is positioned on the inner side wall of the connecting rod (3); the number of the T-shaped sliding grooves (22) is two, the two groups of T-shaped sliding grooves (22) are respectively positioned on two sides of the rotating column (27) on the connecting rod (3), and the end parts of the two groups of T-shaped sliding grooves (22) are both openings.

3. A mathematical model demonstration teaching aid according to claim 2, characterized in that: the bottom of the T-shaped sliding block (23) is provided with a placement groove (25); a rubber roller (24) is movably arranged in the placing groove (25); the outer edge of the rubber roller (24) extends out of the outer port of the placing groove (25); the rubber rollers (24) are linearly arranged in the arrangement groove (25) at equal intervals.

4. A mathematical model demonstration teaching aid according to claim 1, characterized in that: rubber suckers (12) are fixedly arranged on the left side and the right side of the rear side wall of the model panel (1); the rubber suckers (12) are linearly arranged on the rear side wall of the model panel (1) from top to bottom at equal intervals.

5. A mathematical model demonstration teaching aid according to claim 4, characterized in that: the interior of the rubber sucker (12) is communicated with an air cavity (21) in the model panel (1) through an air vent (13) on the rear side wall of the model panel (1); the air cavity (21) is communicated with a strip-shaped through groove (9) formed in the front face of the model panel (1); the side wall of the air cavity (21) provided with the vent hole (13) is fixedly connected with the inner side surface of the elastic pressure plate (15) through a spring; the inner side surface of the elastic pressure plate (15) is fixedly connected with the inner side wall of the air cavity (21) through a spring compression pipe (14); and a spring for connecting the elastic pressing plate (15) and the inner wall of the air chamber (21) is located inside the spring compression tube (14).

6. A mathematical model demonstration teaching aid according to claim 5, characterized in that: a water injection port (28) is formed in the elastic pressing plate (15); and a rubber sealing plug (10) is embedded in the water injection port (28).

Technical Field

The invention belongs to the technical field of mathematical model demonstration teaching aids, and particularly relates to a mathematical model demonstration teaching aid.

Background

An ellipse refers to a trajectory curve of a moving point P in which the sum of distances to fixed points F1, F2 in a mathematical plane is equal to a constant (greater than | F1F2 |). An ellipse is a type of conic section, i.e., a section line of a cone and a plane.

The standard equation for ellipses is divided into two cases:

when the focus is on the x-axis, the standard equation for an ellipse is: x ^2/a ^2+ y ^2/b ^2 ^ 1, (a > b > 0);

when the focus is on the y-axis, the standard equation for an ellipse is: y 2/a 2+ x 2/b 2 ^ 1, (a > b > 0);

wherein a 2-c 2 ^ b ^ 2;

when the standard elliptic equation is solved, a general graph of the equation, namely a coordinate axis, an elliptic curve and a focus of the elliptic equation, needs to be drawn each time, so that the method is troublesome, and particularly for some novice mathematic teachers who just take lessons, the drawing of the elliptic curve is time-consuming and not very standard, and the teaching effect can be influenced; and the shapes of the ellipses with the focuses on the X axis and the Y axis are different, so that the ellipse curve is often drawn for many times when the ellipse equation is explained, and then the ellipse curve is erased and redrawn after one question is explained, which wastes the explanation time.

Therefore, the invention provides a mathematical model demonstration teaching aid to solve the problems.

Disclosure of Invention

In order to make up for the defects of the prior art and solve the problems that when a standard elliptic equation is solved, an approximate graph of the equation needs to be drawn each time, so that the problems of trouble, time waste and influence on the teaching effect are solved, the invention provides a mathematical model demonstration teaching aid.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a mathematical model demonstration teaching aid, which comprises a model panel; a handle is fixedly arranged at the top of the model panel; the front side of the model panel is provided with a mounting groove; a writing board is fixedly arranged inside the mounting groove; a coordinate system is drawn on the surface of the writing board; scale lines are drawn on the coordinate system; the front surface of the writing board is movably provided with an elliptical ring; a connecting rod is fixedly arranged at the position of the long shaft on the elliptical ring; the length of the connecting rod is greater than that of the long axis of the elliptical ring; the middle part of the connecting rod is movably connected with the surface of the writing board through a rotating column, and the rotating column is positioned at the origin of a coordinate system; the rotating column is fixedly connected with the middle part of the connecting rod; the inner side end of the rotating column extends into a power cavity inside the writing board and is fixedly connected with a rotating shaft of the accelerating circular gear; the other rotating shaft of the accelerating circular gear is movably connected to the inner wall of the power cavity; a driving circular gear is movably arranged in the power cavity below the accelerating circular gear; the rotating shaft positioned at the rear side of the driving circular gear is movably connected to the inner wall of the power cavity, and the surface, extending out of the model panel, of the rotating shaft positioned at the front side of the driving circular gear is fixedly connected with the central position of the inner side surface of the turntable; poke rods are uniformly arranged at the edge of the rotating disc; the accelerating circular gear and the driving circular gear are in transmission connection through a gear belt; when the turntable rotates, the elliptical ring and the connecting rod rotate around the origin of the coordinate system in a vertical plane; a pen container is fixedly arranged at the position, close to the lower part, of the front surface of the model panel; the inner side surface of the connecting rod is provided with a cleaning cotton pad for cleaning the surface of the writing board;

during working, when the standard elliptic equation is solved, an approximate graph of the equation, namely a coordinate axis, an elliptic curve and a focus of the elliptic equation, needs to be drawn each time, so that the method is troublesome, and especially for some novice mathematic teachers who just substitute for lessons, the drawing of the elliptic shape is time-consuming and not very standard, and the effect of teaching can be influenced; the formed elliptical rings are adopted, the elliptical rings can be driven to rotate in a vertical plane through the connecting rods, further, when the connecting rods are located on an X axis of a coordinate system, a curve formed by the elliptical rings is a standard elliptical curve equation with a focus on the X axis, and when the connecting rods rotate to a Y axis, a curve formed by the elliptical rings is an elliptical curve equation with a focus on the Y axis, at the moment, known parameters can be marked on the corresponding positions of the elliptical rings on the surface of the writing board and on the coordinate system, so that the next step of solution is facilitated, and students can understand the solution process; the solution of different ellipse standard equations is realized only by rotating the connecting rod to realize the rotation of the elliptical ring without redrawing the elliptical ring;

in actual operation, if the equation of a focus on an X axis is solved, the connecting rod is parallel to the X axis on a coordinate system, when the equation of the focus on the Y axis needs to be solved, the dial rod can rotate the turntable at the moment, the turntable can drive the driving circular gear to rotate at the moment, the driving circular gear can drive the accelerating circular gear to rotate through the gear belt, the connecting rod is driven to rotate to drive the elliptical ring to rotate, the rotation is stopped when the long axis of the elliptical ring is located on the Y axis, corresponding parameters can be marked on the surface of the writing board at the moment, and an auxiliary line and the like are drawn; and when one ellipse standard equation is solved, the connecting rod can be controlled to rotate through the turntable, and the cleaning cotton pad positioned on the inner side surface of the connecting rod can wipe the marked trace on the surface of the writing board in the rotating process of the connecting rod, so that the marking is conveniently carried out when the next standard equation is solved.

Preferably, the cleaning cotton pad is adhered to the surface of the T-shaped sliding block; the T-shaped sliding block is movably inserted in the T-shaped sliding groove; the T-shaped sliding groove is positioned on the inner side wall of the connecting rod; the number of the T-shaped sliding grooves is two, the two groups of T-shaped sliding grooves are respectively positioned on two sides of the rotating column on the connecting rod, and the end parts of the two groups of T-shaped sliding grooves are both provided with openings; during operation, can follow the inside extraction of T shape spout on the connecting rod with T shape slider and come out, and then can clear up the clean cotton pad on T shape slider surface, and then make clean cotton pad clean better the writing board surface.

Preferably, the bottom of the T-shaped sliding block is provided with a placement groove; a rubber roller is movably arranged in the placing groove; the outer edge of the rubber roller extends out of the outer port of the placing groove; the rubber rollers are linearly arranged in the arranging groove at equal intervals; the during operation, the rubber drum that is located the inslot portion of putting not only can convert the face contact between T shape slider and the T shape spout into the line contact between rubber drum and the T shape spout, and then reduce the frictional resistance between T shape slider bottom and the T shape spout inner wall greatly, make the T shape slider insert the more laborsaving of the inside of T shape spout, and simultaneously, because rubber drum itself has certain elasticity, and then rubber drum can compress tightly T shape slider elasticity in the inside of T shape spout, make the grafting of T shape slider in T shape spout inside more firm.

Preferably, rubber suckers are fixedly arranged on the left side and the right side of the rear side wall of the model panel; the rubber suckers are linearly arranged on the rear side wall of the model panel from top to bottom at equal intervals; when the blackboard eraser works, the blackboard eraser can be hung on a blackboard through a lifting handle, and can also be adsorbed on the blackboard through the rubber suckers, and the rubber suckers are linearly arranged on the rear side wall of the model panel from top to bottom at equal intervals, so that the model panel is more firmly installed on the blackboard.

Preferably, the inner part of the rubber sucker is communicated with an air cavity in the model panel through an air vent on the rear side wall of the model panel; the air cavity is communicated with a strip-shaped through groove formed in the front face of the model panel; the side wall of the air cavity, which is provided with the vent hole, is fixedly connected with the inner side surface of the elastic pressing plate through a spring; the inner side surface of the elastic pressure plate is fixedly connected with the inner side wall of the air cavity through a spring compression pipe; and the spring used for connecting the elastic pressure plate and the inner wall of the air cavity is positioned inside the spring compression pipe; the during operation, when carrying out the installation of model panel, accessible rubber suction cup adsorbs the model panel on the blackboard, when the operation, press elastic pressing plate earlier and extrude spring compression pipe and the inside gas of rubber suction cup, then hug closely rubber suction cup on the surface of blackboard, then loosen elastic pressing plate again, elastic pressing plate is reconversion under the effort of the spring that links firmly with it this moment, and drive spring compression pipe simultaneously and extend, and extract the inside gas of rubber suction cup through the air vent, and then adsorb rubber suction cup on the blackboard, easy operation is convenient.

Preferably, the elastic pressing plate is provided with a water filling port; a rubber sealing plug is embedded in the water filling port; when the model panel is in work, before the model panel is installed on a blackboard, the rubber sealing plug on the elastic pressing plate can be firstly pulled out, then a proper amount of water is filled into the spring compression pipe, and then the water filling port on the elastic pressing plate is sealed through the rubber sealing plug, so that when the elastic pressing plate is pressed, the water in the spring compression pipe can be sprayed out of the rubber sucker, the inner wall of the rubber sucker can be wetted, the water can increase the adsorption force between the rubber sucker and the blackboard, and the model panel is more firmly installed on the blackboard; when the model panel is not used for a few days, water sprayed from the rubber sucker can simultaneously play a role in cleaning the inner wall and the end part of the rubber sucker, so that dust adhered to the rubber sucker is prevented from reducing the sealing property between the rubber sucker and the blackboard and further reducing the adsorption force of the rubber sucker.

The invention has the following beneficial effects:

1. the invention relates to a mathematical model demonstration teaching aid, which adopts a formed elliptical ring, the elliptical ring can be driven to rotate in a vertical plane through a connecting rod, and further when the connecting rod is positioned on an X axis of a coordinate system, a curve formed by the elliptical ring is a standard elliptical curve equation with a focus on the X axis, and when the connecting rod rotates to a Y axis, the curve formed by the elliptical ring is an elliptical curve equation with a focus on the Y axis, and at the moment, known parameters can be marked on the corresponding position of the elliptical ring on the surface of a writing board and on the coordinate system, so that the next step of solution is facilitated, and students can understand the solution process; and the solution to different ellipse standard equations only needs to realize the rotation of the elliptical ring by rotating the connecting rod, and the elliptical ring does not need to be redrawn, so that the teaching time can be saved.

2. According to the mathematical model demonstration teaching aid, the cleaning cotton pad and the T-shaped sliding block are arranged, so that marks marked on the surface of the writing board can be wiped by the cleaning cotton pad positioned on the inner side surface of the connecting rod in the rotating process of the connecting rod, and therefore the marks can be conveniently marked when the next standard equation is solved; and can take out T shape slider from the inside of the T shape spout on the connecting rod, and then can clear up the cotton pad of cleaning on T shape slider surface, and then make the cotton pad of cleaning clean better cleaning of writing board surface.

3. According to the mathematical model demonstration teaching aid, the rubber sucker and the spring compression pipe are arranged, when the model panel is installed, the model panel can be adsorbed on the blackboard through the rubber sucker, during operation, the elastic pressing plate is pressed to extrude the spring compression pipe and gas in the rubber sucker, then the rubber sucker is tightly attached to the surface of the blackboard, then the elastic pressing plate is loosened, at the moment, the elastic pressing plate is restored under the action force of the spring fixedly connected with the elastic pressing plate, the spring compression pipe is driven to stretch, the gas in the rubber sucker is extracted through the vent hole, and then the rubber sucker is adsorbed on the blackboard.

Drawings

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

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

FIG. 2 is a schematic diagram of a second perspective structure of the present invention;

FIG. 3 is a schematic view of the connection of the rubber suction cup to the air cavity;

FIG. 4 is a schematic view of the connection of the accelerating circular gear and the driving circular gear;

FIG. 5 is a schematic view of the connection of the T-shaped slider and the T-shaped chute;

in the figure: the device comprises a model panel 1, a coordinate system 2, a connecting rod 3, an elliptical ring 4, a writing board 5, a pen container 6, a rotary disc 7, a poke rod 8, a strip-shaped through groove 9, a rubber sealing plug 10, a rubber suction cup 12, a vent hole 13, a spring compression pipe 14, an elastic pressing plate 15, a power cavity 16, an accelerating circular gear 17, a gear belt 18, a driving circular gear 19, a cleaning cotton pad 20, an air cavity 21, a T-shaped sliding groove 22, a T-shaped sliding block 23, a rubber roller 24, a placing groove 25, a mounting groove 26, a rotating column 27, a water injection port 28 and a handle 29.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 5, the mathematical model demonstration teaching aid of the present invention comprises a model panel 1; a handle 29 is fixedly arranged at the top of the model panel 1; the front surface of the model panel 1 is provided with a mounting groove 26; the writing board 5 is fixedly arranged in the mounting groove 26; a coordinate system 2 is drawn on the surface of the writing board 5; scale lines are drawn on the coordinate system 2; the front surface of the writing board 5 is movably provided with an elliptical ring 4; a connecting rod 3 is fixedly arranged at the position of the long shaft on the elliptical ring 4; the length of the connecting rod 3 is greater than that of the long axis of the elliptical ring 4; the middle part of the connecting rod 3 is movably connected with the surface of the writing board 5 through a rotating column 27, and the rotating column 27 is positioned at the origin of the coordinate system 2; the rotating column 27 is fixedly connected with the middle part of the connecting rod 3; the inner end of the rotating column 27 extends into the power cavity 16 inside the writing board 5 and is fixedly connected with a rotating shaft of the accelerating circular gear 17; the other rotating shaft of the accelerating circular gear 17 is movably connected to the inner wall of the power cavity 16; a driving circular gear 19 is movably arranged in the power cavity 16 below the accelerating circular gear 17; the rotating shaft positioned at the rear side of the driving circular gear 19 is movably connected to the inner wall of the power cavity 16, and the surface, extending out of the model panel 1, of the rotating shaft positioned at the front side of the driving circular gear 19 is fixedly connected with the central position of the inner side surface of the turntable 7; poke rods 8 are uniformly arranged at the edge of the turntable 7; the accelerating circular gear 17 is in transmission connection with the driving circular gear 19 through a gear belt 18; when the turntable 7 rotates, the elliptical ring 4 and the connecting rod 3 rotate around the origin of the coordinate system 2 in a vertical plane; a pen container 6 is fixedly arranged at the position, close to the lower part, of the front surface of the model panel 1; the inner side surface of the connecting rod 3 is provided with a cleaning cotton pad 20 for cleaning the surface of the writing board 5;

during working, when the standard elliptic equation is solved, an approximate graph of the equation, namely a coordinate axis, an elliptic curve and a focus of the elliptic equation, needs to be drawn each time, so that the method is troublesome, and especially for some novice mathematic teachers who just substitute for lessons, the drawing of the elliptic shape is time-consuming and not very standard, and the effect of teaching can be influenced; according to the invention, the formed elliptical ring 4 is adopted, the elliptical ring 4 can be driven to rotate in a vertical plane through the connecting rod 3, and further when the connecting rod 3 is positioned on an X axis of the coordinate system 2, a curve formed by the elliptical ring 4 is a standard elliptical curve equation with a focus on the X axis, and when the connecting rod 3 rotates to a Y axis, a curve formed by the elliptical ring 4 is an elliptical curve equation with a focus on the Y axis, so that known parameters can be marked on the corresponding position of the elliptical ring 4 on the surface of the writing board 5 and the coordinate system 2, the next step of solution is facilitated, and the understanding of students on the solution process is facilitated; the solution of different ellipse standard equations is realized only by rotating the connecting rod 3 to realize the rotation of the elliptical ring 4, and the elliptical ring 4 does not need to be drawn again;

in actual operation, if the equation with the focus on the X axis is solved, the connecting rod 3 is parallel to the X axis on the coordinate system 2, and when the equation with the focus on the Y axis needs to be solved, the dial rod 8 can rotate the turntable 7 at this time, the turntable 7 can drive the driving circular gear 19 to rotate, the driving circular gear 19 can drive the accelerating circular gear 17 to rotate through the gear belt 18, the connecting rod 3 is driven to rotate to drive the elliptical ring 4 to rotate, the rotation is stopped when the long axis of the elliptical ring 4 is located on the Y axis, at this time, corresponding parameters can be marked on the surface of the writing board 5, and an auxiliary line and the like can be drawn; and after one ellipse standard equation is solved, the connecting rod 3 can be controlled to rotate through the turntable 7, and the cleaning cotton pad 20 positioned on the inner side surface of the connecting rod 3 can wipe the marks marked on the surface of the writing board 5 in the rotating process of the connecting rod 3, so that the marks can be conveniently marked when the next standard equation is solved.

As an embodiment of the present invention, the cleaning cotton pad 20 is adhered to the surface of the T-shaped slider 23; the T-shaped sliding block 23 is movably inserted in the T-shaped sliding groove 22; the T-shaped sliding groove 22 is positioned on the inner side wall of the connecting rod 3; the number of the T-shaped sliding grooves 22 is two, the two groups of T-shaped sliding grooves 22 are respectively positioned on two sides of the rotating column 27 on the connecting rod 3, and the end parts of the two groups of T-shaped sliding grooves 22 are both open; during operation, can follow T shape spout 22 on the connecting rod 3 with T shape slider 23 inside the extraction and come out, and then can clear up the cotton pad 20 of cleaning on T shape slider 23 surface, and then make the cotton pad 20 of cleaning better clean the clipboard 5 surface.

As an embodiment of the present invention, a placement groove 25 is formed at the bottom of the T-shaped slider 23; a rubber roller 24 is movably arranged in the placing groove 25; the outer edge of the rubber roller 24 extends out of the outer port of the placing groove 25; the rubber rollers 24 are linearly arranged in the arrangement groove 25 at equal intervals; in operation, the inside rubber drum 24 of resettlement groove 25 not only can convert the face contact between T shape slider 23 and the T shape spout 22 into the line contact between rubber drum 24 and the T shape spout 22, and then reduce the frictional resistance between T shape slider 23 bottom and the T shape spout 22 inner wall greatly, make T shape slider 23 insert the more laborsaving in T shape spout 22's inside, and simultaneously, because rubber drum 24 itself has certain elasticity, and then rubber drum 24 can compress tightly T shape slider 23 elasticity in T shape spout 22's inside, make T shape slider 23 more firm in the inside grafting of T shape spout 22.

As an embodiment of the invention, the left and right sides of the rear side wall of the model panel 1 are both fixedly provided with rubber suckers 12; the rubber suckers 12 are linearly arranged on the rear side wall of the model panel 1 from top to bottom at equal intervals; when the blackboard eraser works, the blackboard eraser can be hung on a blackboard through the lifting handle 29, and can also be adsorbed on the blackboard through the rubber suckers 12, and the rubber suckers 12 are linearly arranged on the rear side wall of the model panel 1 from top to bottom at equal intervals, so that the model panel 1 is more firmly installed on the blackboard.

As an embodiment of the invention, the inside of the rubber suction cup 12 is communicated with the air cavity 21 inside the model panel 1 through the vent hole 13 on the rear side wall of the model panel 1; the air cavity 21 is communicated with a strip-shaped through groove 9 formed in the front face of the model panel 1; the side wall of the air cavity 21 provided with the vent hole 13 is fixedly connected with the inner side surface of the elastic pressing plate 15 through a spring; the inner side surface of the elastic pressure plate 15 is fixedly connected with the inner side wall of the air cavity 21 through a spring compression pipe 14; and a spring for connecting the elastic pressing plate 15 and the inner wall of the air chamber 21 is located inside the spring compression tube 14; the during operation, when carrying out model panel 1's installation, accessible rubber suction cup 12 adsorbs model panel 1 on the blackboard, when the operation, press elastic pressing plate 15 earlier and extrude spring compression pipe 14 and the inside gas of rubber suction cup 12, then hug closely rubber suction cup 12 on the surface of blackboard, then loosen elastic pressing plate 15 again, elastic pressing plate 15 reconversion under the effort of the spring that links firmly with it this moment, and drive spring compression pipe 14 simultaneously and extend, and extract the inside gas of rubber suction cup 12 through air vent 13, and then adsorb rubber suction cup 12 on the blackboard, and easy operation is convenient.

As an embodiment of the present invention, the elastic pressing plate 15 is provided with a water injection port 28; a rubber sealing plug 10 is embedded in the water injection port 28; during operation, before the model panel 1 is installed on the blackboard, the rubber sealing plug 10 on the elastic pressing plate 15 can be firstly pulled out, then a proper amount of water is filled into the spring compression pipe 14, and then the water filling port 28 on the elastic pressing plate 15 is sealed through the rubber sealing plug 10, so that when the elastic pressing plate 15 is pressed, the water in the spring compression pipe 14 can be sprayed out from the rubber sucker 12, the effect of wetting the inner wall of the rubber sucker 12 can be achieved, the water can increase the adsorption force between the rubber sucker 12 and the blackboard, and the model panel 1 can be installed on the blackboard more firmly; meanwhile, when the model panel 1 is not used for several days, the water sprayed from the rubber suction cup 12 can simultaneously play a role in cleaning the inner wall and the end part of the rubber suction cup 12, so that dust adhered to the rubber suction cup 12 is prevented from reducing the sealing property between the rubber suction cup 12 and the blackboard, and the adsorption force of the rubber suction cup 12 is further reduced.

The specific working process of the invention is as follows:

during working, when the standard elliptic equation is solved, an approximate graph of the equation, namely a coordinate axis, an elliptic curve and a focus of the elliptic equation, needs to be drawn each time, so that the method is troublesome, and especially for some novice mathematic teachers who just substitute for lessons, the drawing of the elliptic shape is time-consuming and not very standard, and the effect of teaching can be influenced; according to the invention, the formed elliptical ring 4 is adopted, the elliptical ring 4 can be driven to rotate in a vertical plane through the connecting rod 3, and further when the connecting rod 3 is positioned on an X axis of the coordinate system 2, a curve formed by the elliptical ring 4 is a standard elliptical curve equation with a focus on the X axis, and when the connecting rod 3 rotates to a Y axis, a curve formed by the elliptical ring 4 is an elliptical curve equation with a focus on the Y axis, so that known parameters can be marked on the corresponding position of the elliptical ring 4 on the surface of the writing board 5 and the coordinate system 2, the next step of solution is facilitated, and the understanding of students on the solution process is facilitated; the solution of different ellipse standard equations is realized only by rotating the connecting rod 3 to realize the rotation of the elliptical ring 4, and the elliptical ring 4 does not need to be drawn again;

in actual operation, if the equation with the focus on the X axis is solved, the connecting rod 3 is parallel to the X axis on the coordinate system 2, and when the equation with the focus on the Y axis needs to be solved, the dial rod 8 can rotate the turntable 7 at this time, the turntable 7 can drive the driving circular gear 19 to rotate, the driving circular gear 19 can drive the accelerating circular gear 17 to rotate through the gear belt 18, the connecting rod 3 is driven to rotate to drive the elliptical ring 4 to rotate, the rotation is stopped when the long axis of the elliptical ring 4 is located on the Y axis, at this time, corresponding parameters can be marked on the surface of the writing board 5, and an auxiliary line and the like can be drawn; and after one ellipse standard equation is solved, the connecting rod 3 can be controlled to rotate through the turntable 7, and the cleaning cotton pad 20 positioned on the inner side surface of the connecting rod 3 can wipe the marks marked on the surface of the writing board 5 in the rotating process of the connecting rod 3, so that the marks can be conveniently marked when the next standard equation is solved.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.