CN209649882U - A kind of mathematics drawing instruments - Google Patents

Abstract

The utility model provides a kind of mathematics drawing instruments, the utility model solve the problems, such as more single existing drawing tools function and between unadjustable chalk and blackboard apart from；The technical solution of solution includes: to slide vertically the ruler for being connected to cylinder side wall and bottom of cylinder is fixedly connected with sucker, entire diagraph is fixed on blackboard by sucker, and the ruler can be rotated around cylinder also carries out vertically movable adjusting the distance between chalk and blackboard along cylinder, and chalk can be slided under the action of chalk gripping mechanism along ruler, various sizes of round or line segment can be drawn, ruler lower rotation, which is equipped with auxiliary scale, can cooperate ruler to draw triangle or coordinate system etc., considerably increase the applicability of the diagraph.

Description

A kind of mathematics drawing instruments

Technical field

The utility model relates to mathematical education technical field more particularly to a kind of mathematics drawing instruments.

Background technique

In Mathematics Discipline, there are algebra, several how a variety of classification, need to pass through figure in teacher's teaching and students'learning Drafting come understand, with geometry various definition and solve a problem, and will do it during carrying out mathematical education various The drafting of figure, such as: circle, triangle, coordinate system etc., the drawing instruments of the prior art are all simple function mostly, various Different figures needs different drawing instruments, and use is very inconvenient, gives the biggish inconvenience of teaching bring；In existing number Learn during classroom gives lessons, teacher usually with the relatively simple set square of some functions, ruler, justify rail etc., by holding these Drawing tools carries out the drafting of figure on blackboard, is easy to influence drafting figure because hand shakes in drawing process Shape influences teaching efficiency so that the figure drawn out is not more accurate；Currently, the mathematics of more and more functional diversities is drawn Map device comes into being, although these drawing tools can draw out different geometries, its fix chalk position with it is black The distance between plate is unadjustable, usually fixed range, this, which just will appear, to use the time longer respectively and serious wear When, distance can be generated between chalk and blackboard, teacher can re-replace new chalk under normal conditions, this will lead to original Some chalks are not used completely, waste resource；Furthermore existing mathematics drawing instruments loosely lean on the fixation clamping of chalk, In Easily occur the case where chalk shaking in drawing course, cause plotting quality bad, influences classroom instruction, therefore a kind of energy is drawn Different geometric figures and the mathematics drawing instruments that distance between chalk and blackboard can be adjusted just seem more urgent.

Utility model content

For above situation, for the defect for overcoming the prior art, the utility model provides a kind of mathematics drawing instruments, the mathematics Drawing instruments preferably resolve traditional mathematics plotting unit function it is more single and in drawing process easily generate shake Problem can draw some common triangles, round and coordinate system etc. by the mathematics drawing device, and can be as needed The triangle to be drawn, circular size are adjusted；And can adjust in the mathematics drawing instruments chalk and blackboard it Between distance, when leading to serious wear when chalk is longer using the time, we can by adjusting between chalk and blackboard away from From making chalk contact at blackboard always, is drawn convenient for teacher and also substantially increase the utilization rate of chalk.

Specific technical solution is as follows:

A kind of mathematics drawing instruments, including sucker, which is characterized in that the sucker upper surface is fixedly connected with cylinder and cylinder Top is concentric to be fixed with angle scale, the described screw rod for having bottom of cylinder to be rotatably equipped with coaxial heart setting and leads on screw rod It crosses and has been threadedly engaged lifting ring, be fixed with connecting rod on the lifting ring periphery and connecting rod is pierced by cylinder, cylinder side outward Offer the slideway that cooperation is slid vertically with connecting rod on wall, connecting rod be pierced by outward through slideway one end be fixed with it is coaxial with cylinder The annulus of heart setting, being rotatably assorted on the annulus periphery has the driving worm gear of co-axial heart setting, drives worm gear bottom It is connected with horizontal-extending ruler, the ruler other end slidably connects chalk gripping mechanism, is provided on the lifting ring For driving the driving device of driving worm gear rotation.

Preferably, it is offered on the annulus periphery and is respectively equipped with ring on two bottom walls of annular groove and annular groove or more Shape slides chamber, and the worm gear is rotatably assorted in annular groove and driving worm gear and annular groove are rotatably assorted position upper and lower end faces It is respectively arranged with the annular convex platform being slidably matched with the sliding chamber of annular.

Preferably, the driving device includes: the L for being fixedly connected on lifting ring periphery and sliding vertically cooperation with slideway Shape bar, L shape bar be placed in the outer one end of cylinder be fixedly connected with in the circular cylindrical cavity of the concentric setting of cylinder and cylindrical cavity body It is rotatably equipped with the driving worm screw with driving worm wheel.

Preferably, be sliding combined with pointer on the angle scale periphery and pointer bottom be fixedly connected with it is vertically arranged Rectangular cylinder, the ruler upper surface are fixed with the rectangular shaft being slidably matched with rectangular cylinder.

Preferably, the ruler offers the sliding chamber of rectangle along its length, and the chalk gripping mechanism includes that sliding is matched Together in the sliding intracavitary rectangular block of rectangle, the rectangular block upper surface is rotatably equipped with to run through among clamping worm gear and clamping worm gear and open Equipped with chalk card slot, the rectangular block bottom is equipped with circular hole corresponding with chalk card slot, and the clamping worm gear is uniformly distributed along the circumference Through several arc grooves are offered, it is equipped in the chalk card slot on quantity fastening plate corresponding with arc groove and fastening plate It is fixed with the sliding axle for the cooperation that is slidably connected with arc groove, when so that clamping worm gear rotating, several fastening plates are towards center Gather stirrup or far from unclamping, is rotatably equipped with and the clamping worm screw of clamping worm wheel and clamping snail on the rectangular block Wheel is placed in rectangular block one end and is fixed with the first knob.

Preferably, the ruler upper and lower ends are equipped with the rectangle for extending along its length and matching with chalk card slot Hole.

Preferably, by being threadedly engaged positioning screw and positioning screw rotational installation in the sliding chamber of rectangle on the rectangular block In sucker one side wall, positioning screw is fixed with the second knob far from sucker one end.

Preferably, the ruler is equipped with auxiliary scale far from sucker one end lower rotation and the auxiliary scale other end is equipped with location hole, It is inserted and in location hole on ruler by being threadedly engaged positioning bolt and positioning bolt lower end.

(1) the utility model provides a kind of mathematics drawing instruments, which preferably resolves traditional mathematics and draw Map device function is more single and easily leads to the problem of shaking due to holding drawing tool in drawing process, passes through the mathematics Drawing device can draw some common triangles, round and coordinate system etc., and can be as needed to be drawn three Angular, circular size is adjusted；

(2) in the mathematics drawing instruments can adjust chalk between blackboard at a distance from, led when chalk is longer using the time When causing serious wear, we can make chalk contact at blackboard always by adjusting the distance between chalk and blackboard, convenient for awarding Class teacher, which is drawn, also substantially increases the utilization rate of chalk, and chalk gripping mechanism is slidably connected on ruler can be by chalk It is effectively firmly fixed on ruler, so that being not in the case where chalk shakes everywhere when being drawn, is conducive to improve Plotting quality.

Detailed description of the invention

Fig. 1 is the utility model overall structure diagram；

Fig. 2 is the utility model schematic side view；

Fig. 3 is the utility model schematic top plan view；

Fig. 4 is that the utility model drives worm gear and driving worm screw matching relationship elevational schematic view；

Fig. 5 is the utility model L shape bar, circular cylindrical cavity matching relationship schematic diagram；

Fig. 6 is internal structure matching relationship schematic diagram in the utility model cylindrical portions section view；

Fig. 7 be the utility model auxiliary scale be unfolded when with ruler matching relationship schematic diagram；

Fig. 8 is the utility model chalk gripping mechanism structural schematic diagram；

Fig. 9 is this practical new rectangular block and ruler matching relationship schematic diagram；

Figure 10 is schematic diagram after the utility model clamping worm gear, multiple fastening plates, rectangular block separation；

Figure 11 is schematic diagram after the utility model lifting ring, annulus, driving worm gear separation；

Figure 12 is that the utility model rectangular block separates rear structural schematic diagram with ruler.

Specific embodiment

Aforementioned and other technology contents, feature and effect in relation to the utility model, in following cooperation with reference to figures 1 through figure In the detailed description of 12 pairs of embodiments, can clearly it present.The structure content being previously mentioned in following embodiment is with explanation Book attached drawing is reference.

Each exemplary embodiment of the utility model is described below with reference to accompanying drawings.

A kind of mathematics drawing instruments, including sucker 1, which is characterized in that 1 upper surface of sucker be fixedly connected with cylinder 2 and The top of cylinder 2 is concentric to be fixed with angle scale 3, the described screw rod 4 for thering is 2 lower rotation of cylinder to be equipped with coaxial heart setting and By being threadedly engaged lifting ring 5 on screw rod 4, connecting rod 6 is fixed on 5 periphery of lifting ring and connecting rod 6 is worn outward Cylinder 2 out offer the slideway 7 that cooperation is slid vertically with connecting rod 6 on 2 side wall of cylinder, and connecting rod 6 is pierced by outward through slideway 7 One end is fixed with the annulus 8 with the concentric setting of cylinder 2, and being rotatably assorted on 8 periphery of annulus has the co-axial heart to be arranged Driving worm gear 9, driving 9 bottom of worm gear be connected with horizontal-extending ruler 10,10 other end of ruler slidably connects powder Gripping mechanism is provided with the driving device for driving driving worm gear 9 to rotate on the lifting ring 5.

When in use, the utility model provides a kind of mathematics drawing instruments to the embodiment, which passes through use Sucker 1 is adsorbed in entire on blackboard as map device, and diagraph is firmly fixed on black by sucker 1 under the action of atmospheric pressure On plate, teacher during mapping is substantially reduced by way of holding drawing tool and drawing relative to traditional teacher Burden, and will not occur the case where drawing tool generates shaking during mapping, so that plotting quality greatly improves；It inhales Be fixed on disk 1 it is concentric in cylinder 2 and cylinder 2 be rotatably equipped with screw rod 4, pass through screw thread (screw rod 4 and lifting ring 5 on screw rod 4 Between screw thread be self-locking thread) be combined with lifting ring 5 and lifting ring 5 and pass through the connecting rod 6 being firmly connected with it and slide vertically and match Together in the slideway 7 being arranged on 2 side wall of cylinder, we are placed in the outer one end of cylinder 2 in screw rod 4 and are provided with third knob 36 and lead to Cross rotation third knob 36 drive lifting ring 5 carried out in cylinder 2 it is vertically movable (it is preferable we in screw rod 4 and 2 bottom of cylinder Be rotatably assorted position), lifting ring 5 is fixedly connected with the annulus 8 being slidably matched with 2 periphery of cylinder, annulus 8 by connecting rod 6 The driving worm gear 9 of co-axial heart setting is installed on periphery and to drive 9 lower end surface of worm gear to be connected with horizontal-extending straight Ruler 10, we by rotation third knob 36 drive lifting ring 5 carried out in cylinder 2 it is vertically movable drive it is horizontally disposed Ruler 10 is moved vertically, to realize the effect for adjusting distance between ruler 10 and blackboard, is filled when being located at chalk clamping When chalk in setting serious wear occurs because using the time longer, chalk length can shorten accordingly and then lead to chalk not Inconsistent with blackboard again, traditional its chalk of mathematics diagraph and the distance between blackboard are unadjustable, after this occurs The chalk usually more renewed causes chalk utilization rate not high, wastes resource significantly, we pass through mobile ruler 10 and blackboard The distance between so adjust the distance between chalk and blackboard so that when chalk serious wear shortens, by screwing third It screws and adjusts the distance between ruler 10 and blackboard, so that remaining to contact at blackboard and for writing picture after chalk shortens Figure, improves greatly the utilization rate of chalk；We are equipped with the driving device for driving driving worm gear 9 to rotate on lifting ring 5, drive Dynamic worm gear 9 rotates under the action of driving device and then drives the ruler 10 of connection fixed thereto around 2 turns of cylinder Dynamic, we are provided on angle scale 3 and angle scale 3 at the top of cylinder 2 and are provided with angle value, we can draw round or and angle The cooperation of scale 3 draws different size of angle, we on ruler 10 by sliding chalk gripping mechanism (due to being arranged on ruler 10 Have scale), chalk gripping mechanism can be slided into the circle at corresponding graduation position and then drawing required size or straight by we Line segment, to realize the line segment of the circle or different length that draw different radii size.

Embodiment 2 offers annular groove 11 and annular groove on 8 periphery of annulus on the basis of embodiment 1 It is respectively equipped with the sliding chamber 12 of annular on about 11 two bottom walls, the worm gear is rotatably assorted in annular groove 11 and driving worm gear and ring The position upper and lower end faces that are rotatably assorted of shape sliding slot 11 are respectively arranged with the annular convex platform 13 being slidably matched with the sliding chamber 12 of annular.

The embodiment when in use, about driving worm gear 9 be how to be rotatablely installed on 8 periphery of annulus will be It is described in detail below；It specifically can refer to state shown in attached drawing 11, lifting ring 5 is by being threadedly engaged in screw rod 4 and through connecting Bar 6, which slides vertically, is matched with cylinder 2, cylinder 2 through connecting rod 6 be connected with cylinder 2 it is concentric setting and be slidably matched with cylinder 2 Annulus 8, we offer annular groove 11 on 8 periphery of annulus, driving 9 upper and lower end faces of worm gear respectively with annular groove Be rotatably assorted between about 11 two bottom walls, we offered respectively on about 11 two bottom wall of annular groove the sliding chamber 12 of annular and The annular convex platform 13 being slidably matched with the sliding chamber 12 of annular is respectively equipped in driving 9 upper and lower end faces of worm gear, so that driving worm gear 9 Block through annular convex platform 13 and in annulus 8, when vertically being moved under drive of the annulus 8 in lifting ring 5 and then drives drive Dynamic worm gear 9 is moved vertically, to realize the effect of distance between adjustment ruler 10 and black pen, we are by being set to liter Driving device on drop ring 5 can drive driving worm gear 9 to be rotated, and then ruler 10 is driven to rotate around cylinder 2, and according to Need to draw out corresponding figure, that is, driving worm gear 9 can also be acted on vertically carrying out movement with annulus 8 in driving device Under rotated in horizontal plane；Preferably, we can be provided with coefficient of friction in driving worm gear 9 and the position that is rotatably assorted of annulus 8 Lesser rotating gasket, to reduce the frictional resistance between driving worm gear 9 and annulus 8, so that driving worm gear 9 is in driving device Drive under can easily be rotated around annulus 8.

Embodiment 3, on the basis of embodiment 1, the driving device include: be fixedly connected on 5 periphery of lifting ring and Slide vertically the L shape bar 14 of cooperation with slideway 7, L shape bar 14 is placed in the outer one end of cylinder 2 and is fixedly connected with and cylinder 2 is concentric sets The driving worm screw 16 matched with driving worm gear 9 is rotatably equipped in the circular cylindrical cavity 15 and circular cylindrical cavity 15 set.

The embodiment when in use, about the driving device being set on lifting ring 5 be how to work will with Under be described in detail；It can refer to state shown in attached drawing 4,5, we are fixedly connected with and are set on 5 periphery of lifting ring Slideway 7 on 2 side wall of cylinder slides vertically the L shape bar 14 of cooperation and L shape bar 14 is placed in the outer one end of cylinder 2 and is fixedly connected with and circle The circular cylindrical cavity 15(of 2 concentric settings of cylinder is referring to shown in attached drawing 4), we are rotatably equipped with and drive in circular cylindrical cavity 15 The driving worm screw 16 that dynamic worm gear 9 matches, driving worm screw 16 are pierced by the outer one end of circular cylindrical cavity 15 and are connected with the 4th knob 37, I By rotation the 4th knob 37 drive driving worm screw 16 rotation drive drive worm gear 9 rotate, to realize drive Ruler 10 surrounds the effect that cylinder 2 is rotated, and corresponding required figure can be drawn, due to the self-locking effect between worm and gear (worm screw can drive worm gear 9 and worm gear cannot drive worm screw 16), when ruler 10 turns to a certain required position around cylinder 2, Teacher can draw the line segment of corresponding length by the chalk gripping mechanism being slideably positioned on ruler 10, as long as we The 4th knob 37 is not rotated, and shaking situation would not occur in ruler 10 at this time, so that picture quality is higher.

Embodiment 4 is sliding combined with pointer 17 and pointer 17 on 3 periphery of angle scale on the basis of embodiment 1 Bottom is fixedly connected with vertically arranged rectangular cylinder 18, and 10 upper surface of ruler is fixed with the square being slidably matched with rectangular cylinder 18 Shape bar 19.

When in use, preferably, we are sliding combined with pointer 17 to the embodiment on the periphery of angle scale 3, Referring to shown in attached drawing 6,17 bottom of pointer, which is fixedly connected with to be sliding combined in rectangular cylinder 18 and rectangular cylinder 18, is set to ruler 10 Rectangular shaft 19 on upper surface, while ruler 10 is rotated around cylinder 2, synchronous drive pointer 17 surrounds angle scale 3 It is rotated, finds out that ruler 10 surrounds the angle that cylinder 2 is turned over so as to more accurate, intuitive, it is different big convenient for drawing Small angle, or the circular arc of different angle is drawn out, so that teacher's mapping is more convenient, quick.

Embodiment 5, on the basis of embodiment 1, the ruler 10 offer the sliding chamber 20 of rectangle along its length, described Chalk gripping mechanism includes the rectangular block 21 being snug fit in the sliding chamber 20 of rectangle, and 21 upper surface of rectangular block is rotatably equipped with Through chalk card slot 23 is offered among clamping worm gear 22 and clamping worm gear 22,21 bottom of rectangular block is equipped with and chalk card slot 23 corresponding circular holes 24, the clamping worm gear 22, which is uniformly distributed along the circumference to run through, offers several arc grooves 25, the chalk card It is equipped with quantity fastening plate 26 corresponding with arc groove 25 in slot 23 and fastens to be fixed on plate 26 and is slidably connected with arc groove 25 The sliding axle 27 of cooperation, when so that clamping worm gear 22 rotating, several fastening plates 26 gather stirrup or separate towards center It unclamps, is rotatably equipped with the clamping worm screw 28 matched with clamping worm gear 22 on the rectangular block 21 and clamping worm gear 22 is placed in square 21 one end of shape block is fixed with the first knob 29.

The embodiment when in use, about chalk gripping mechanism be how to be slidably matched on ruler 10 will with Under be described in detail；It can refer to state shown in attached drawing 9, we are equipped with the square extended along 10 length direction of ruler on ruler 10 It is sliding combined with rectangular block 21 in the sliding chamber 20 of shape and the sliding chamber 20 of rectangle, 21 upper surface of rectangular block is rotatably equipped with clamping worm gear 22 (referring to shown in attached drawing 8,10), and through offering chalk card slot 23 among clamping worm gear 22,21 bottom of rectangular block offer with The corresponding circular hole 24 of chalk card slot 23, the setting of chalk card slot 23 and circular hole 24 enable chalk pass through clamping worm gear 22 with And rectangular block 21 and by multiple fastening plates 26 carry out clamping fixed, multiple fastening sliding axles of the plate 26 by connection fixed thereto 27 are slidably connected in the multiple arcs slot 25 being arranged on clamping worm gear 22, we by screwing the first knob 29 so that It is rotatablely installed and is rotated in the clamping worm screw 28 in rectangular block 21, and then clamping worm gear 22 with matching is driven to rotate, work as card When tight worm gear 22 rotates under the driving of clamping worm screw 28, several fastening plates 26 are gathered towards 23 center of chalk card slot Stirrup or separate release, so that the effect of chalk clamping is made multiple 26 courts of fastening plate when chalk needs replacing by realization Far from 23 center of chalk card slot far from unclamp, replaced.

Embodiment 6, on the basis of embodiment 5,10 upper and lower ends of ruler be equipped with along its length extend and with The rectangular opening 30 that chalk card slot 23 matches.

When in use, we are arranged the embodiment in 10 upper and lower end faces of ruler and 23 opposite position of chalk card slot There is rectangular opening 30, since chalk length is longer, so that chalk passes through chalk card slot 23 and is fixed through multiple fastening plates 26 After clamping, chalk upper and lower ends are pierced by ruler 10 outward respectively, and chalk is pierced by ruler 10 through the rectangular opening 30 close to blackboard one end And contact on blackboard, when rectangular opening 30 is slided along ruler 10, be set in clamping worm gear 22 by multiple fastenings The chalk of the fixed clamping of plate 26 is slided along the rectangular opening 30 for being set to 10 upper and lower end faces of ruler.

Embodiment 7, on the basis of embodiment 5, by being threadedly engaged positioning screw 31 and having determined on the rectangular block 21 In the sliding chamber 20 of rectangle in 1 one side wall of sucker, positioning screw 31 is fixed with the far from 1 one end of sucker for the position rotational installation of screw rod 31 Two knobs 32.

The embodiment is how in the sliding chamber 20 of rectangle being set in ruler 10 about rectangular block 21 when in use It is slided and is positioned, will be described in detail following；Referring to shown in attached drawing 12, pass through screw thread on rectangular block 21 It is combined with positioning screw 31 of the rotational installation in the sliding chamber 20 of rectangle close to 1 one side wall of sucker, we pass through rotating second knob 32 It drives positioning screw 31 to rotate and then rectangular block 21 is driven to be moved along the sliding chamber 20 of rectangle, and realize positioning.

Embodiment 8, on the basis of embodiment 1, the ruler 10 are equipped with auxiliary scale 33 far from 1 one end lower rotation of sucker And 33 other end of auxiliary scale is equipped with location hole 34, by being threadedly engaged positioning bolt 35 and 35 lower end of positioning bolt is inserted on ruler 10 With in location hole 34.

When in use, preferably, we are equipped with pair far from 1 one end lower rotation of sucker in ruler 10 to the embodiment Ruler 33 and 33 other end of auxiliary scale are equipped with location hole 34, pass through on ruler 10 and have been threadedly engaged under positioning bolt 35 and positioning bolt 35 End inserts and in the location hole 34 being arranged in auxiliary scale 33, needs to make it from fixed using screwing out positioning bolt 35 when auxiliary scale 33 upwards Position skids off in hole 34, is turned out auxiliary scale 33(state referring to shown in attached drawing 7 at this time), it can cooperate with ruler 10 and draw triangle The figures such as shape or coordinate system.

The utility model provides a kind of mathematics drawing instruments, which preferably resolves traditional mathematics drawing dress Set function it is more single and in drawing process since hand-held drawing tool easily leads to the problem of shaking, drawn by the mathematics Device can draw some common triangles, round and coordinate system etc., and can as needed to the triangle to be drawn, Circular size is adjusted；

In the mathematics drawing instruments can adjust chalk between blackboard at a distance from, cause to grind when chalk is longer using the time When damaging serious, we can make chalk contact at blackboard always by adjusting the distance between chalk and blackboard, old convenient for giving lessons Shi Jinhang, which draws, also substantially increases the utilization rate of chalk, and chalk gripping mechanism is slidably connected on ruler 10 to have chalk Effect is firmly fixed on ruler 10, so that being not in the case where chalk shakes everywhere when being drawn, is conducive to improve Plotting quality.

It is described above simply to illustrate that the utility model, it is understood that the utility model is not limited to the above implementation Example, the various variants for meeting the utility model thought both are within the protection scope of the present invention.

Claims (8)

1. a kind of mathematics drawing instruments, including sucker (1), which is characterized in that sucker (1) upper surface is fixedly connected with cylinder (2) and it is concentric at the top of cylinder (2) be fixed with angle scale (3), described have cylinder (2) lower rotation to be equipped with the coaxial heart to set By being threadedly engaged lifting ring (5) on the screw rod (4) and screw rod (4) set, connection is fixed on lifting ring (5) periphery Bar (6) and connecting rod (6) is pierced by cylinder (2) outward offers on cylinder (2) side wall and slides vertically cooperation with connecting rod (6) Slideway (7), connecting rod (6) be pierced by outward through slideway (7) one end be fixed with the annulus (8) of cylinder (2) concentric setting, it is described Being rotatably assorted on annulus (8) periphery has the driving worm gear (9) of co-axial heart setting, and driving worm gear (9) bottom is connected with water The flat ruler (10) extended, ruler (10) other end slidably connect chalk gripping mechanism, are arranged on the lifting ring (5) There is the driving device for driving driving worm gear (9) rotation.

2. a kind of mathematics drawing instruments according to claim 1, which is characterized in that offered on annulus (8) periphery It is sliding chamber (12) that annular groove (11) and annular groove (11) are respectively equipped with annular on two bottom walls up and down, the worm gear be rotatably assorted in In annular groove (11) and driving worm gear and annular groove (11) the position upper and lower end faces that are rotatably assorted are respectively arranged with and annular The annular convex platform (13) that sliding chamber (12) are slidably matched.

3. a kind of mathematics drawing instruments according to claim 1, which is characterized in that the driving device includes: to be fixedly connected Slide vertically in lifting ring (5) periphery and with slideway (7) the L shape bar (14) of cooperation, L shape bar (14) is placed in cylinder (2) outside one End be fixedly connected with the circular cylindrical cavity (15) of cylinder (2) concentric setting and be rotatably equipped in circular cylindrical cavity (15) with The driving worm screw (16) that driving worm gear (9) matches.

4. a kind of mathematics drawing instruments according to claim 1, which is characterized in that slided on angle scale (3) periphery It is combined with pointer (17) and pointer (17) bottom is fixedly connected with vertically arranged rectangular cylinder (18), ruler (10) upper surface It is fixed with the rectangular shaft (19) being slidably matched with rectangular cylinder (18).

5. a kind of mathematics drawing instruments according to claim 1, which is characterized in that the ruler (10) is opened along its length Sliding chamber (20) equipped with rectangle, the chalk gripping mechanism includes the rectangular block (21) being snug fit in rectangle sliding chamber (20), institute Rectangular block (21) upper surface is stated to be rotatably equipped among clamping worm gear (22) and clamping worm gear (22) through offering chalk card slot (23), rectangular block (21) bottom is equipped with circular hole (24) corresponding with chalk card slot (23), clamping worm gear (22) edge Circumference uniform distribution is equipped with quantity and arc groove (25) is opposite through several arc grooves (25) are offered in the chalk card slot (23) The fastening plate (26) answered and the sliding axle (27) that the cooperation that is slidably connected with arc groove (25) is fixed in fastening plate (26), so that card When tight worm gear (22) rotation, several fastening plates (26) gather stirrup or separate release, the rectangular block towards center (21) it is rotatably equipped with the clamping worm screw (28) matched with clamping worm gear (22) on and clamping worm gear (22) is placed in rectangular block (21) one end is fixed with the first knob (29).

6. a kind of mathematics drawing instruments according to claim 5, which is characterized in that ruler (10) upper and lower ends are equipped with edge The rectangular opening (30) that its length direction extends and matches with chalk card slot (23).

7. a kind of mathematics drawing instruments according to claim 5, which is characterized in that matched on the rectangular block (21) by screw thread Conjunction has positioning screw (31) and positioning screw (31) rotational installation in rectangle sliding chamber (20) in sucker (1) one side wall, positioning Screw rod (31) is fixed with the second knob (32) far from sucker (1) one end.

8. a kind of mathematics drawing instruments according to claim 1, which is characterized in that the ruler (10) is far from sucker (1) one End lower rotation is equipped with auxiliary scale (33) and auxiliary scale (33) other end is equipped with location hole (34), by being threadedly engaged on ruler (10) There is positioning bolt (35) and positioning bolt (35) lower end is inserted and in location hole (34).