CN112874212A

CN112874212A - Drawing device for mathematical education with adjustable

Info

Publication number: CN112874212A
Application number: CN202110113034.1A
Authority: CN
Inventors: 蒲秀琴
Original assignee: Chongqing Vocational Institute of Engineering
Current assignee: Chongqing Vocational Institute of Engineering
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2021-06-01

Abstract

The invention relates to the technical field of teaching equipment, and discloses an adjustable drawing device for mathematical teaching, which comprises a ruler plate and is characterized in that: the top of the ruler plate is marked with scale marks, and the slide way is arranged on the scale marks. This drawing device for mathematical education with adjustable is through utilizing the blackboard to the effect of the extrusion force of pilot pin to start actuating mechanism's deformation, thereby can make arc magnetic stripe and magnetism join in marriage the distance of ball more and more far away under actuating mechanism's drive, when reaching the certain degree, magnetism counter weight ball can break away from the deformation bag under magnetic effect, thereby has reached the purpose to a transformation of extrusion force. This drawing device for mathematical education with adjustable through the gravity action that produces when utilizing magnetism counter weight ball whereabouts, can be to the effect of extrusion power of elastic webbing, and deformation can take place for the elastic webbing under the effect of extrusion power, thereby can make gravity bounce ball take place to remove and extrude small-size exhaust bag when elastic webbing deformation, reaches the purpose to the blackboard clearance before the drawing circle.

Description

Drawing device for mathematical education with adjustable

Technical Field

The invention relates to the technical field of teaching equipment, in particular to an adjustable drawing device for mathematical teaching.

Background

In the mathematical learning, especially the learning of geometric knowledge, drawing of geometric figures is often required, and for drawing of circular patterns, a special tool, namely compasses, is required; the compasses are made of metal materials, plastics and the like, and are provided with two feet, wherein one foot is a fixed foot and the other foot is a rotary foot, the tail end of the fixed foot is provided with a metal needle, and the metal needle determines the position of a circle center.

And in the mathematics teaching process, the compasses size that uses is great, can will rotate the rule foot and strut after fixed rule foot confirms the centre of a circle, and when both strut the angle great, fixed rule foot can produce the slope and the rule foot tip is easy to loosen and takes off and lead to its painting brush contact drawing board to be slim and graceful, and then the figure is drawn incessantly unintelligibly, and the control range of compasses is limited simultaneously. In the past, teachers spend too much time and energy on making traditional teaching aids, but the ideal effect cannot be achieved.

Based on the above, the invention designs an adjustable drawing device for mathematical education to solve the above problems.

Disclosure of Invention

The invention aims to provide an adjustable drawing device for mathematical education, which is used for solving the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a drawing device for mathematical education with adjustable, includes chi board, its characterized in that: the chalk clamp is characterized in that scale marks are carved on the top of the ruler plate, a slide way is formed in the upper face of each scale mark, a positioning needle is arranged at the left end of the ruler plate, a chalk clamping device is arranged at one end, far away from the positioning needle, of the ruler plate, and the chalk clamping device can be adjusted to move.

Preferably, the positioning needle penetrates through the bottom of the ruler plate and extends to the inside, a driving mechanism is arranged at the top of the extending part of the positioning needle, the driving mechanism comprises a deformation bag, arc-shaped supporting rods, rotating plates, arc-shaped magnetic stripes, extrusion plates, a restoring spring and a magnetic counterweight ball, the bottom of the deformation bag is fixedly connected with the extending part of the positioning needle, one end of the deformation bag, far away from the positioning needle, is fixedly connected with the inner wall of the upper side of the ruler plate, the two arc-shaped supporting rods are fixedly connected with the inner wall of the top side of the deformation bag, one ends of the two arc-shaped supporting rods, far away from the inner wall of the top side of the deformation bag, are fixedly connected with the two rotating plates, the middle shaft of the rotating plates is hinged, the two rotating plates are fixedly connected with the inner wall of the top side of the deformation bag, one ends of the two rotating plates, the two ends of the extrusion plates are fixedly connected with the two rotating plates through two connecting rods respectively, the two extrusion plates are fixedly connected through a recovery spring, and the two magnetic balance weight balls are adsorbed at the left end and the right end of the deformation bag respectively.

Preferably, the two sides of the driving mechanism are provided with a flow guide mechanism, the flow guide mechanism comprises an arc-shaped flow guide plate and a flow guide driving mechanism, and the two flow guide driving mechanisms are respectively arranged at the left end and the right end of the arc-shaped flow guide plate.

Preferably, water conservancy diversion actuating mechanism includes arc water conservancy diversion rotor plate, water conservancy diversion telescopic link, water conservancy diversion bracing piece, water conservancy diversion stripper plate, water conservancy diversion magnetic ball, two the arc water conservancy diversion rotor plate is articulated with the lateral wall of arc guide plate, the both ends of water conservancy diversion telescopic link respectively with the surface fixed connection of two arc water conservancy diversion rotor plates, the top side inner wall fixed connection of water conservancy diversion bracing piece and arc guide plate, the one end and the water conservancy diversion rotor plate fixed connection of arc guide plate are kept away from to the water conservancy diversion backup pad, water conservancy diversion stripper plate and water conservancy diversion rotor plate fixed connection, the one end that the water conservancy diversion rotor plate was kept away from to the water conservancy diversion stripper plate runs through the arc guide plate and extends to the outside, two the one end that the.

Preferably, the outer surface of the flow guide magnetic ball is provided with a limiting mechanism, the limiting mechanism comprises a first limiting rotating rod, a second limiting rotating rod and a crescent limiting plate, the first limit rotating rod is hinged with the inner part of the outer wall of the arc-shaped guide plate, one end of the first limit rotating rod, which is far away from the inner part of the outer wall of the arc-shaped guide plate, penetrates through the other side of the outer wall of the arc-shaped guide plate and extends to the outer side, the extending part of the first limiting rotating rod is contacted with the flow guide rotating plate, the second limiting rotating rod is hinged with the inner part of the outer wall of the arc-shaped flow guide plate, one end of the second limiting rotating rod, which is far away from the inner part of the outer wall of the arc-shaped guide plate, is fixedly connected with the crescent limiting plate, the one end that the spacing dwang of second was kept away from to crescent limiting plate runs through the arc guide plate and extends to the outside, the extension and the water conservancy diversion magnetism ball contact of the spacing dwang of second.

Preferably, a gravity rebounding mechanism is fixedly installed on the bottom side inside the ruler plate, the gravity rebounding mechanism comprises vertical plates, an elastic belt and a gravity rebounding ball, the two vertical plates are fixedly installed on the bottom side inside the ruler plate, two ends of the elastic belt are fixedly connected with one ends, far away from the bottom side inside the ruler plate, of the two vertical plates respectively, and the gravity rebounding ball is fixedly connected with a middle shaft of the elastic belt through a spring.

Preferably, the bottom of gravity bounce-back mechanism is provided with exhaust group, exhaust group is including small-size exhaust bag, exhaust push rod, small-size exhaust bag fixed mounting is inboard at the outer wall of chi board, the top of small-size exhaust bag and the inner wall fixed connection of chi board, the one end that chi inboard wall was kept away from to small-size exhaust bag sets up with the outer wall intercommunication of chi board, two through exhaust push rod fixed connection between the small-size exhaust bag.

Compared with the prior art, the invention has the beneficial effects that:

(1) this drawing device is used in mathematical education with adjustable, through the effect that utilizes the blackboard to the extrusion force of pilot pin to start actuating mechanism's deformation, thereby can make arc magnetic stripe and magnetism join in marriage the distance of ball more and more far away under actuating mechanism's drive, when reaching certain degree, magnetism counter weight ball can break away from the deformation bag under magnetic effect, thereby has reached the purpose to a transformation of extrusion force.

(2) This drawing device for mathematical education with adjustable through the gravity action that produces when utilizing magnetism counter weight ball whereabouts, can be to the effect of extrusion power of elastic band, and the elastic band can take place deformation under the effect of extrusion power, thereby can make gravity bounce ball take place to remove and extrude small-size exhaust pocket when elastic band deformation, reaches the purpose to the blackboard clearance before the drawing circle.

(3) This drawing device for mathematical education with adjustable through setting up water conservancy diversion mechanism, sets up water conservancy diversion magnetic ball in water conservancy diversion device the inside to utilize cooperation stop gear under the effect of mutual magnetic effect and inertial force, can reach and make the purpose that magnetism counterweight ball shakes repeatedly before the pressure of pilot pin disappears.

(4) This drawing device for mathematical education with adjustable through set up the scale mark on the chi board, can realize the accurate positioning to drawing circle size through removing chalk clamping device.

Drawings

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

FIG. 2 is a schematic view of the internal structure of the ruler plate according to the present invention;

FIG. 3 is a general schematic view of the drive mechanism of the present invention;

FIG. 4 is a schematic view of the flow guide mechanism of the present invention;

FIG. 5 is an enlarged view of A of FIG. 4 according to the present invention;

FIG. 6 is an enlarged view of B of FIG. 5 according to the present invention.

In the figure: 1. a ruler plate; 2. scale lines; 3. a slideway; 4. a positioning pin; 5. a drive mechanism; 51. a deformation bladder; 52. an arc-shaped support rod; 53. a rotating plate; 54. an arc-shaped magnetic strip; 55. a pressing plate; 56. a restoring spring; 57. a magnetic counter weight ball; 6. a flow guide mechanism; 61. an arc-shaped guide plate; 62. a diversion drive mechanism; 621. an arc-shaped diversion rotating plate; 622. a flow guiding telescopic rod; 623. a flow guide support rod; 624. a flow guide extrusion plate; 625. a flow guiding magnetic ball; 7. a limiting mechanism; 71. a first limiting rotating rod; 72. a second limiting rotating rod; 73. a crescent limiting plate; 8. a gravity rebounding mechanism; 81. a vertical plate; 82. an elastic band; 83. a gravity bounce ball; 9. an exhaust group; 91. a small exhaust bladder; 92. an exhaust push rod; 10. a chalk clamping device.

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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, the present invention provides a technical solution: the utility model provides a drawing device for mathematical education with adjustable, including ruler board 1, ruler board 1's top is carved with scale mark 2, the purpose that sets up scale mark 2 is in order to be can accurate adjustment distance, slide 3 has been seted up above the scale mark 2, the purpose that sets up slide 3 is in order to facilitate the regulation, ruler board 1's left end is provided with pilot pin 4, the purpose that sets up pilot pin 4 is in order to facilitate the location, ruler board 1 is far away from the one end of pilot pin 4 and is provided with chalk clamping device 10, the purpose that sets up chalk clamping device 10 is in order to press from both sides tight chalk, chalk clamping device 10 adjustable removal, the purpose that sets up like this is in order to adjust distance.

The positioning needle 4 penetrates through the bottom of the ruler plate 1 and extends to the inside, a driving mechanism 5 is arranged at the top of an extending part of the positioning needle 4, the driving mechanism 5 is arranged to facilitate utilization of pressing force of positioning on a blackboard, the driving mechanism 5 comprises a deformation bag 51, an arc-shaped supporting rod 52, a rotating plate 53, an arc-shaped magnetic strip 54, a pressing plate 55, a restoring spring 56 and a magnetic counterweight ball 57, the bottom of the deformation bag 51 is fixedly connected with the extending part of the positioning needle 4, the purpose of the arrangement is to facilitate conduction of the pressing force, one end, far away from the positioning needle 4, of the deformation bag 51 is fixedly connected with the inner wall of the upper side of the ruler plate 1, the purpose of the arrangement is to limit the deformation bag 51, the two arc-shaped supporting rods 52 are fixedly connected with the inner wall of the top side of the deformation bag 51, the purpose of the arrangement is to push the rotating plate 53 to rotate, one ends, far away from, the axis department of rotor plate 53 is articulated, the purpose that sets up like this is for it to receive the extrusion force can rotate, two rotor plates 53 all with the top side inner wall fixed connection who warp bag 51, two rotor plates 53 keep away from the one end that warp bag 51 respectively with two arc magnetic stripe 54 fixed connection, the purpose that sets up arc magnetic stripe 54 is for adsorbing magnetism counterweight ball 57, through spring fixed connection between two rotor plates 53, two connecting rods and two rotor plates 53 fixed connection are passed through respectively to the both ends of stripper plate 55, through recovering spring 56 fixed connection between two stripper plates 55, two magnetism counterweight balls 57 adsorb respectively and warp both ends about bag 51, the purpose that sets up like this is for its recovery.

The two sides of the driving mechanism 5 are provided with the diversion mechanisms 6, the diversion mechanisms 6 are arranged for guiding the trend of the magnetic counterweight balls 57, each diversion mechanism 6 comprises an arc-shaped diversion plate 61 and a diversion driving mechanism 62, and the two diversion driving mechanisms 62 are respectively arranged at the left end and the right end of the arc-shaped diversion plate 61.

The diversion driving mechanism 62 comprises an arc diversion rotating plate 621, a diversion telescopic rod 622, a diversion supporting rod 623, a diversion squeezing plate 624, a diversion magnetic ball 625, two arc diversion rotating plates 621 are hinged to the side wall of the arc diversion plate 61, two ends of the diversion telescopic rod 622 are respectively fixedly connected with the outer surfaces of the two arc diversion rotating plates 621, the diversion supporting rod 623 is fixedly connected with the inner wall of the top side of the arc diversion plate 61, one end, away from the arc diversion plate 61, of the diversion supporting plate 623 is fixedly connected with the diversion rotating plate 621, the diversion squeezing plate 624 is fixedly connected with the diversion rotating plates 621, one end, away from the diversion rotating plates 621, of the diversion squeezing plate 624 penetrates through the arc diversion plate 61 and extends to the outside, one end, away from the arc diversion guide plate 61, of the two diversion rotating plates 621 is contacted with the diversion magnetic ball 625, and the.

The outer surface of the flow guiding magnetic ball 625 is provided with a limiting mechanism 7, the limiting mechanism 7 comprises a first limiting rotating rod 71, a second limiting rotating rod 72 and a crescent limiting plate 73, the first limiting rotating rod 71 is hinged with the inner part of the outer wall of the arc-shaped flow guiding plate 61, one end of the first limiting rotating rod 71, which is far away from the inner part of the outer wall of the arc-shaped flow guiding plate 61, penetrates through the other side of the outer wall of the arc-shaped flow guiding plate 61 and extends to the outside, the extending part of the first limiting rotating rod 71 is contacted with the flow guiding rotating plate 621, the second limiting rotating rod 72 is hinged with the inner part of the outer wall of the arc-shaped flow guiding plate 61, one end of the second limiting rotating rod 72, which is far away from the inner part of the outer wall of the arc-shaped flow guiding plate 61, is fixedly connected with the, this is provided for the purpose of limiting the magnetic ball 625 for flow guidance.

The bottom side of the inside of the ruler plate 1 is fixedly provided with a gravity rebounding mechanism 8, the gravity rebounding mechanism 8 comprises a vertical plate 81, an elastic belt 82 and a gravity rebounding ball 83, the two vertical plates 81 are fixedly arranged on the bottom side of the inside of the ruler plate 1, two ends of the elastic belt 82 are respectively fixedly connected with one ends of the two vertical plates 81 far away from the bottom side of the inside of the ruler plate 1, the gravity rebounding ball 83 is fixedly connected with a middle shaft of the elastic belt 82 through a spring, and the purpose of the arrangement is rebounding of the magnetic counterweight ball 57.

The bottom of gravity bounce-back mechanism 83 is provided with exhaust group 9, exhaust group 9 is including small-size exhaust bag 91, exhaust push rod 92, small-size exhaust bag 91 fixed mounting is inboard at the outer wall of chi board 1, the top of small-size exhaust bag 91 and the inner wall fixed connection of chi board 1, the one end that chi board 1 inner wall was kept away from to small-size exhaust bag 91 sets up with the outer wall intercommunication of chi board 1, through exhaust push rod 92 fixed connection between two small-size exhaust bags 91, the purpose that sets up like this can clear up the dust on the blackboard earlier before drawing the circle.

The working principle is as follows:

when a teacher needs to draw a circle on the blackboard, the teacher can move the chalk clamping mechanism 10 to adjust to a proper position according to the size of the circle to be drawn, then adjust the chalk clamping mechanism 10 to clamp the chalk, hold the middle shaft of the ruler plate 1 with hands, enable the positioning needle 4 to abut against the blackboard, and rotate the ruler plate 1 to draw the needed circle.

Can receive the extrusion force of blackboard when the pilot pin 4 supports on the blackboard, can remove when the pilot pin 4 receives the effect of extrusion force, thereby can extrude deformation bag 51 under the removal of pilot pin 4, receive the extrusion and can take place to warp when deformation bag 51, two arc bracing pieces 52 can promote rotor plate 53 and take place to rotate when deformation bag 51 warp, two rotor plates 53 rotate and can promote the rotor plate 55 and take place to remove, thereby under the removal of rotor plate 55, arc magnetic stripe 54 can be to the central department of deformation bag 51 removal, magnetic force can be littleer and littleer when arc magnetic stripe 54 moves certain distance, when magnetic force reaches certain degree, magnetism counterweight ball 57 can break away from deformation bag 51 thereby fall, fall on the elastic webbing 82 when deformation bag 51 falls, under the effect of magnetism counterweight ball 57 gravity. The elastic band 82 can deform to extrude towards the inside, the gravity bounce ball 83 can be pushed to move downwards when the elastic band 82 extrudes towards the inside, the small exhaust bag 91 can be extruded after the gravity bounce ball 83 moves downwards, and the small exhaust bag 91 can deform when being extruded, so that a chain reaction can be generated under the action of the exhaust push rod 92, and the exhaust group 9 can process dust on the blackboard.

When the magnetic counterweight ball 57 presses the elastic belt 82 to deform, and after the elastic belt is pressed to a certain degree, the magnetic counterweight ball 57 rebounds under the action of the spring, so that the magnetic force of the flow guide magnetic ball 625 is absorbed on the arc-shaped guide plate 61, when the magnetic counterweight ball 57 touches the arc-shaped guide plate 61, a certain vibration is generated, so that the flow guide pressing plate 624 moves inwards, after the flow guide pressing plate 624 moves, the arc-shaped flow guide rotating plate 621 is pushed to move inwards, so that the limiting mechanism 7 relieves the limiting effect on the flow guide magnetic ball 625, when the arc-shaped flow guide rotating plate 621 rotates inwards, an outward pressing force is applied to the flow guide magnetic ball 625, so that the flow guide magnetic ball 625 moves inside the arc-shaped guide plate 61 under the action of the outward pressing force, and when the flow guide magnetic ball 625 moves to the other side, the flow guide magnetic ball 625 presses the arc-shaped flow guide rotating plate 621, make arc water conservancy diversion rotating plate 621 take place outside rotation, can promote first spacing dwang 71 when arc water conservancy diversion rotating plate 621 outwards rotates and take place to rotate, can make the spacing dwang 72 of second take place to rotate after first spacing dwang 71 rotates, thereby make crescent limiting plate 73 carry on spacingly to water conservancy diversion magnetic ball 625 under the rotation of the spacing dwang 72 of second, water conservancy diversion magnetic ball 625 stop motion under inertial effect, thereby make magnetism counterweight ball 57 break away from, magnetism counterweight ball 57 breaks away from and can extrude elastic webbing 82, thereby repeat down so that realized blowing repeatedly to the blackboard, arc magnetic stripe 54 can adsorb magnetic counterweight ball 57 again under actuating mechanism 5's effect reconversion when the pressure to the blackboard is relieved to pilot pin 4.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a drawing device for mathematical education with adjustable, includes chi board (1), its characterized in that: the chalk ruler is characterized in that scale marks (2) are carved on the top of the ruler plate (1), a slide way (3) is formed in the upper face of each scale mark (2), a positioning needle (4) is arranged at the left end of the ruler plate (1), a chalk clamping device (10) is arranged at one end, far away from the positioning needle (4), of the ruler plate (1), and the chalk clamping device (10) can be adjusted to move.

2. The adjustable drawing device for mathematics teaching of claim 1, wherein: the positioning needle (4) penetrates through the bottom of the ruler plate (1) and extends to the inside, a driving mechanism (5) is arranged at the top of an extending portion of the positioning needle (4), the driving mechanism (5) comprises a deformation bag (51), arc-shaped supporting rods (52), a rotating plate (53), an arc-shaped magnetic stripe (54), an extrusion plate (55), a recovery spring (56) and a magnetic counterweight ball (57), the bottom of the deformation bag (51) is fixedly connected with the extending portion of the positioning needle (4), one end, far away from the positioning needle (4), of the deformation bag (51) is fixedly connected with the inner wall of the upper side of the ruler plate (1), the two arc-shaped supporting rods (52) are fixedly connected with the inner wall of the top side of the deformation bag (51), one ends, far away from the inner wall of the top side of the deformation bag (51), of the two arc-shaped supporting rods (52) are fixedly connected with the two rotating plates (53), and, two rotor plate (53) all with the top side inner wall fixed connection who warp bag (51), two the one end that warp bag (51) was kept away from in rotor plate (53) respectively with two arc magnetic stripe (54) fixed connection, two through spring fixed connection between rotor plate (53), the both ends of stripper plate (55) are respectively through two connecting rods and two rotor plate (53) fixed connection, two through recovering spring (56) fixed connection, two between stripper plate (55) magnetism counter weight ball (57) adsorbs respectively at the both ends of controlling that warp bag (51).

3. The adjustable drawing device for mathematics teaching of claim 2, wherein: the two sides of the driving mechanism (5) are provided with flow guide mechanisms (6), each flow guide mechanism (6) comprises an arc-shaped flow guide plate (61) and a flow guide driving mechanism (62), and the flow guide driving mechanisms (62) are arranged at the left end and the right end of the arc-shaped flow guide plate (61) respectively.

4. The adjustable drawing device for mathematics teaching of claim 3, wherein: water conservancy diversion actuating mechanism (62) are including arc water conservancy diversion rotating plate (621), water conservancy diversion telescopic link (622), water conservancy diversion bracing piece (623), water conservancy diversion stripper plate (624), water conservancy diversion magnetic ball (625), two arc water conservancy diversion rotating plate (621) are articulated with the lateral wall of arc guide plate (61), the both ends of water conservancy diversion telescopic link (622) are connected with the external fixed surface of two arc water conservancy diversion rotating plates (621) respectively, top side inner wall fixed connection of water conservancy diversion bracing piece (623) and arc guide plate (61), the one end and the water conservancy diversion rotating plate (621) fixed connection of arc guide plate (61) are kept away from to water conservancy diversion bracing piece (623), water conservancy diversion stripper plate (624) and water conservancy diversion rotating plate (621) fixed connection, the one end that water conservancy diversion rotating plate (621) were kept away from to water conservancy diversion stripper plate (624) runs through arc guide plate (61) and extends to the outside, two one end and water conservancy diversion magnetic ball (625) that arc guide plate ) And (4) contacting.

5. The adjustable drawing device for mathematics teaching of claim 4, wherein: the surface of water conservancy diversion magnetic ball (625) is provided with stop gear (7), stop gear (7) are including first spacing dwang (71), the spacing dwang of second (72), crescent limiting plate (73), first spacing dwang (71) is inside articulated with the outer wall of arc guide plate (61), the inside one end of arc guide plate (61) outer wall is kept away from in first spacing dwang (71) runs through the opposite side of arc guide plate (61) outer wall and extends to the outside, the extension and the water conservancy diversion rotor plate (621) contact of first spacing dwang (71), the inside articulated of outer wall of second spacing dwang (72) and arc guide plate (61), the inside one end of outer wall and crescent limiting plate (73) fixed connection of arc guide plate (61) are kept away from in second spacing dwang (72), crescent limiting plate (73) keep away from the one end of second spacing dwang (72) and run through arc guide plate (61) and extend And the extension part of the second limiting rotating rod (72) is contacted with the flow guide magnetic ball (625) when extending to the outside.

6. The adjustable drawing device for mathematics teaching of claim 5, wherein: the gravity rebounding mechanism (8) is fixedly installed on the bottom side of the inside of the ruler plate (1), the gravity rebounding mechanism (8) comprises vertical plates (81), elastic belts (82) and gravity rebounding balls (83), the two vertical plates (81) are fixedly installed on the bottom side of the inside of the ruler plate (1), two ends of each elastic belt (82) are fixedly connected with one end, far away from the bottom side of the inside of the ruler plate (1), of each vertical plate (81), and each gravity rebounding ball (83) is fixedly connected with the middle shaft of the corresponding elastic belt (82) through a spring.

7. The adjustable drawing device for mathematics teaching of claim 6, wherein: the bottom of gravity bounce-back mechanism (83) is provided with exhaust group (9), exhaust group (9) are including small-size exhaust bag (91), exhaust push rod (92), small-size exhaust bag (91) fixed mounting is inboard at the outer wall of chi board (1), the top of small-size exhaust bag (91) and the inner wall fixed connection of chi board (1), the one end that chi board (1) inner wall was kept away from in small-size exhaust bag (91) sets up with the outer wall intercommunication of chi board (1), two through exhaust push rod (92) fixed connection between small-size exhaust bag (91).