CN107618299A - A kind of higher mathematics picture rectangle teaching aid - Google Patents

Abstract

The present invention relates to higher mathematics picture teaching aid technical field, in particular it is a kind of higher mathematics picture rectangle teaching aid, including bracket component, picture component, length control assembly, belt, sucker, handle and chalk fixation kit, the convenient entirety of device moves, flexibility is big, drawing chalk carries out a ° rotation in the presence of picture component, teacher can be helped to draw the rectangle of standard rapidly, math teacher is allowed to instruct student with more time and efforts, improve efficiency of teaching, the length and width of simultaneous graphic system chalk can be adjusted, and practicality is good.Described bracket component is rotatablely connected with picture component, length control assembly is slidably connected with bracket component, belt is connected between bracket component and picture component, sucker shares two, sucker is bonded on bracket component, handle is welded with bracket component, chalk fixation kit is slidably connected with length control assembly.

Description

A kind of higher mathematics picture rectangle teaching aid

Technical field

The present invention relates to higher mathematics picture teaching aid technical field, is in particular a kind of higher mathematics picture rectangle religion Tool.

Background technology

, it is necessary to which often graphing carries out explaining illustration to student in Higher Mathematics Teaching, and figure is drawn on blackboard Shape, because it is pressed for time, drawn figure is less accurate, draw influences results of learning and quality of instruction hurriedly, it is difficult to by institute State content accurately to express, sometimes even influence the accuracy of solution procedure and result.Patent No. CN201620788508.7 A kind of mathematics drawing tools, the utility model discloses a kind of mathematics drawing tools, including two symmetrically arranged support bars, And coordinating the panel of two support bars, the opening position between two support bars close to bottom is provided with cross bar, institute The upper and lower both sides opening position for stating panel is provided with fix bar, and the front end face of the fix bar is provided with neck, and the neck connects Fixture block is connected to, the front end face opening position of the fixture block is provided with support block, and is connected between the top surface of two pieces of support blocks One cross bar, the bottom position of first cross bar are provided with contiguous block, and the bottom position of the contiguous block is provided with wiping face The cleaning block of plate；The mathematics drawing tools by be provided with the left panel with coordinate line allow teacher mapping when it is more accurate, Figure is more beautiful, student can be allowed to be better understood from, and improves the quality of teaching whereby, the use of cleaning block can allow teacher not straight Contact cleaning block, it ensure that the clean of hand.This device is inconvenient to move carrying, and drawing efficiency is low.

The content of the invention

The present invention provides a kind of higher mathematics picture rectangle teaching aid, and its advantage is that the convenient entirety of device moves, Flexibility is big, and drawing chalk carries out 360 ° of rotations in the presence of picture component, and teacher can be helped to draw the rectangle of standard rapidly, Allow math teacher to instruct student with more time and efforts, improve efficiency of teaching, the length and width of simultaneous graphic system chalk It can be adjusted, practicality is good.

The present invention relates to higher mathematics picture teaching aid technical field, is in particular a kind of higher mathematics picture rectangle religion Tool, including bracket component, picture component, length control assembly, belt, sucker, handle and chalk fixation kit, device facilitate whole Body moves, and flexibility is big, and drawing chalk carries out 360 ° of rotations in the presence of picture component, teacher can be helped to draw rapidly The rectangle of standard, allow math teacher to instruct student with more time and efforts, improve efficiency of teaching, simultaneous graphic system chalk Length and width can be adjusted, and practicality is good.

Described bracket component is rotatablely connected with picture component, and length control assembly is slidably connected with bracket component, support Belt is connected between component and picture component, sucker shares two, and sucker is bonded on bracket component, is welded on bracket component There is handle, chalk fixation kit is slidably connected with length control assembly.

Described bracket component includes V-type frame, motor rack, motor, belt wheel, contiguous block, sucker disk seat, screw rod frame, screw rod, sky Heart stud and handle, the lower end of V-type frame are welded with contiguous block, and manhole, the centre position weldering of V-type frame are provided with contiguous block Motor rack is connected to, motor is fixed by screws on motor rack, and belt wheel is fixedly connected on motor by machine shaft, V-type frame The left and right ends of upper end are respectively welded a sucker disk seat, screwed hole are provided with two sucker disk seats, positioned at the sucker disk seat of left end Left end be welded with a screw rod frame, be welded with a screw rod frame positioned at the right-hand member of the sucker disk seat of right-hand member, screw rod is through two suctions Disk seat is rotatably connected between two screw rod framves, and the left end of screw rod is provided with plus thread, and the right-hand member of screw rod is provided with left-hand thread, spiral shell The left and right ends of bar are rotatably connected to a hollow stud respectively, and the inner ring of two hollow studs and outer ring are provided with screw thread, The outer ring of two hollow studs coordinates with the screwed hole on sucker disk seat respectively, and the left end of screw rod is fixedly connected with handle, two suctions The front end of disk seat is respectively welded a sucker, and the upper end of two sucker disk seats is welded with handle；

Described picture component includes inserted link, bull stick, socket, adjustable spring and L-square, and the rear end of socket, which is welded with, to be turned Bar, bar rotation are connected on contiguous block, and belt is connected between belt wheel and bull stick, and the left end of inserted link is slidably connected at socket On, the right-hand member of inserted link is welded with L-square, adjustable spring is socketed with inserted link, adjustable spring is between socket and L-square；

Described length control assembly includes round bar, slide, gear circle, upper stopper, lower block, coulisse, pinion stand, upper cunning Groove, upper L-type connecting rod, gear, idler gear, swing handle, lower gear, lower L-type connecting rod, gliding groove, upper hinge bar and lower hinge bar, The upper end of round bar is welded with slide, and the upper end of slide is cylinder, and the lower end of slide is rectangular configuration, and the upper end of slide is provided with Manhole, the lower end of round bar are welded with gear circle, and upper stopper and lower block are symmetrically slidably connected at the upper and lower ends of round bar, round bar Seat is slidably connected on round bar, is welded with coulisse between slide and gear circle, the upper end of coulisse is provided with upper hopper chute, coulisse Lower end be provided with gliding groove, the centre position of coulisse is welded with pinion stand, and idler gear is rotatably connected on by gear shaft The centre position of pinion stand, swing handle is fixedly connected with idler gear, gear is rotatably connected on pinion stand by gear shaft Upper end, the lower end of upper L-type connecting rod are rotatably connected on gear, and the upper end of upper L-type connecting rod is hinged on hinge bar, upper be hinged Bar is slidably connected in upper hopper chute, and the rear end of upper hinge bar is welded in upper stopper, and lower gear is rotatably connected on by gear shaft The lower end of pinion stand, the upper end of lower L-type connecting rod are rotatably connected on lower gear, and the lower end of lower L-type connecting rod is hinged on lower hinge bar On, lower hinge bar is slidably connected in gliding groove, and the rear end of lower hinge bar is welded on lower block, and slide is slidably connected at screw rod On.

Described chalk fixation kit includes round bar seat, L-type L-square, connecting plate and fixture, is provided with round bar seat Manhole, the left and right ends of round bar seat are respectively welded a L-type L-square, connection are welded between two L-type L-squares Plate, the front end of connecting plate are welded with fixture, and round bar seat is rotatably connected on L-square, and round bar seat is slidably connected on round bar.

Described fixture includes open tubular column, Z-type pressing plate, slide bar and holddown spring, and the inwall upper end of open tubular column is welded with Articulated column, the front end of Z-type pressing plate are hinged on the articulated column on hollow column wall, and the upper end of open tubular column is provided with rectangular through-hole, The upper end of slide bar is slidably connected in the rectangular through-hole on open tubular column, and the lower end of slide bar is welded on the rear end of Z-type pressing plate, on slide bar Holddown spring is socketed with, between open tubular column and Z-type pressing plate, the rear end of open tubular column is welded on connecting plate holddown spring.

Rubber sleeve is bonded with described handle.

Scale value is carved with described screw rod and round bar.

A kind of higher mathematics picture rectangle teaching aid of the invention has the beneficial effect that：

A kind of higher mathematics picture rectangle teaching aid of the present invention, the convenient entirety of device move, and flexibility is big, drawing chalk 360 ° of rotations are carried out in the presence of picture component, teacher can be helped to draw the rectangle of standard rapidly, allow math teacher with more Time and efforts instruct student, improve efficiency of teaching, the length and width of simultaneous graphic system chalk can be adjusted, practical Property is good.

Brief description of the drawings

The present invention will be further described in detail with specific implementation method below in conjunction with the accompanying drawings.

Fig. 1 is a kind of structural representation of higher mathematics picture rectangle teaching aid of the present invention；

Fig. 2 is a kind of structural representation in another direction of higher mathematics picture rectangle teaching aid；

Fig. 3 is the structural representation of bracket component；

Fig. 4 is the structural representation of picture component；

Fig. 5 is the structural representation of length control assembly；

Fig. 6 is the structural representation of chalk fixation kit；

Fig. 7 is the structural representation of round bar seat.

In figure：Bracket component 1；V-type frame 1-1；Motor rack 1-2；Motor 1-3；Belt wheel 1-4；Contiguous block 1-5；Sucker disk seat 1- 6；Screw rod frame 1-7；Screw rod 1-8；Hollow stud 1-9；Handle 1-10；Picture component 2；Inserted link 2-1；Bull stick 2-2；Socket 2-3；Stretch Contracting spring 2-4；L-square 2-5；Length control assembly 3；Round bar 3-1；Slide 3-2；Gear circle 3-3；Upper stopper 3-4；Lower block 3- 5；Coulisse 3-6；Pinion stand 3-7；Upper hopper chute 3-8；Upper L-type connecting rod 3-9；Gear 3-10；Idler gear 3-11；Swing handle 3- 12；Lower gear 3-13；Lower L-type connecting rod 3-14；Gliding groove 3-15；Upper hinge bar 3-16；Lower hinge bar 3-17；Belt 4；Sucker 5； Handle 6；Chalk fixation kit 7；Round bar seat 7-1；L-type L-square 7-2；Connecting plate 7-3；Fixture 7-4.

Embodiment

Embodiment one：

Illustrate present embodiment with reference to Fig. 1-7, the present invention relates to higher mathematics picture teaching aid technical field, more specifically Say it is a kind of higher mathematics picture rectangle teaching aid, including bracket component 1, picture component 2, length control assembly 3, belt 4, inhale Disk 5, handle 6 and chalk fixation kit 7, the convenient entirety of device move, and flexibility is big, work of the drawing chalk in picture component Carried out under 360 ° rotation, teacher can be helped to draw the rectangle of standard rapidly, allow math teacher with more time and efforts come Student is instructed, improves efficiency of teaching, the length and width of simultaneous graphic system chalk can be adjusted, and practicality is good.

Described bracket component 1 is rotatablely connected with picture component 2, and length control assembly 3 is slidably connected with bracket component 1, Belt 4 is connected between bracket component 1 and picture component 2, sucker 5 shares two, and sucker 5 is bonded on bracket component 1, support Handle 6 is welded with component 1, chalk fixation kit 7 is slidably connected with length control assembly 3.

Described bracket component 1 includes V-type frame 1-1, motor rack 1-2, motor 1-3, belt wheel 1-4, contiguous block 1-5, sucker Seat 1-6, screw rod frame 1-7, screw rod 1-8, hollow stud 1-9 and handle 1-10, V-type frame 1-1 lower end are welded with contiguous block 1-5, Manhole is provided with contiguous block 1-5, V-type frame 1-1 centre position is welded with motor rack 1-2, and motor 1-3 is consolidated by screw It is scheduled on motor rack 1-2, belt wheel 1-4 is fixedly connected on motor 1-3 by machine shaft, the left and right ends of V-type frame 1-1 upper ends It is respectively welded on sucker disk seat a 1-6, two sucker disk seat 1-6 and is provided with screwed hole, positioned at the sucker disk seat 1-6 of left end left end A screw rod frame 1-7 is welded with, is welded with a screw rod frame 1-7 positioned at the sucker disk seat 1-6 of right-hand member right-hand member, screw rod 1-8 is passed through Two sucker disk seat 1-6 are rotatably connected between two screw rod frame 1-7, and screw rod 1-8 left end is provided with plus thread, screw rod 1-8's Right-hand member is provided with left-hand thread, and screw rod 1-8 left and right ends are rotatably connected to a hollow stud 1-9, two hollow studs respectively 1-9 inner ring and outer ring are provided with screw thread, and two hollow stud 1-9 outer ring is matched somebody with somebody with the screwed hole on sucker disk seat 1-6 respectively To close, the front end that screw rod 1-8 left end is fixedly connected with handle 1-10, two sucker disk seat 1-6 is respectively welded a sucker 5, and two Individual sucker disk seat 1-6 upper end is welded with handle 6, turn clockwise handle 1-10 when, the hollow stud 1-9 positioned at left end is in screw rod Move right, while be moved to the left positioned at the hollow stud 1-9 of right-hand member on screw rod 1-8, rotate counterclockwise handle 1-10 on 1-8 When, the hollow stud 1-9 positioned at left end is moved to the left on screw rod 1-8, while is located at the hollow stud 1-9 of right-hand member in screw rod 1- Moved right on 8, realize that two hollow stud 1-9 are simultaneously opposite or mobile backwards on screw rod 1-8；

Described picture component 2 includes inserted link 2-1, bull stick 2-2, socket 2-3, adjustable spring 2-4 and L-square 2-5, inserts Seat 2-3 rear end is welded with bull stick 2-2, and bull stick 2-2 is rotatably connected on contiguous block 1-5, is connected between belt wheel 1-4 and bull stick 2-2 Belt 4 is connected to, inserted link 2-1 left end is slidably connected on socket 2-3, and inserted link 2-1 right-hand member is welded with L-square 2-5, inserted link Adjustable spring 2-4 is socketed with 2-1, adjustable spring 2-4 is between socket 2-3 and L-square 2-5, motor 1-3 band movable belt pulleys 1-4 is rotated, and belt wheel 1-4 drives bull stick 2-2 to be rotated on contiguous block 1-5 by belt 4, and L-square 2-5 can be with by inserted link 2-1 Realization is slided on socket 2-3；

Described length control assembly 3 includes round bar 3-1, slide 3-2, gear circle 3-3, upper stopper 3-4, lower block 3-5, cunning Frid 3-6, pinion stand 3-7, upper hopper chute 3-8, upper L-type connecting rod 3-9, gear 3-10, idler gear 3-11, swing handle 3-12, under Gear 3-13, lower L-type connecting rod 3-14, gliding groove 3-15, upper hinge bar 3-16 and lower hinge bar 3-17, round bar 3-1 upper end weldering Slide 3-2 is connected to, slide 3-2 upper end is cylinder, and slide 3-2 lower end is rectangular configuration, and slide 3-2 upper end is provided with Manhole, round bar 3-1 lower end are welded with gear circle 3-3, upper stopper 3-4 and lower block 3-5 and are symmetrically slidably connected at round bar 3-1 Upper and lower ends, round bar seat 2-7 is slidably connected on round bar 3-1, and coulisse 3-6 is welded between slide 3-2 and gear circle 3-3, Coulisse 3-6 upper end is provided with upper hopper chute 3-8, and coulisse 3-6 lower end is provided with gliding groove 3-15, in coulisse 3-6 Between position be welded with pinion stand 3-7, idler gear 3-11 is rotatably connected on pinion stand 3-7 centre position by gear shaft, in Between be fixedly connected with swing handle 3-12 on gear 3-11, gear 3-10 is rotatably connected on pinion stand 3-7 upper end by gear shaft, Upper L-type connecting rod 3-9 lower end is rotatably connected on gear 3-10, and upper L-type connecting rod 3-9 upper end is hinged on hinge bar 3-16 On, upper hinge bar 3-16 is slidably connected in upper hopper chute 3-8, and upper hinge bar 3-16 rear end is welded on upper stopper 3-4, lower tooth Wheel 3-13 is rotatably connected on pinion stand 3-7 lower end by gear shaft, and lower L-type connecting rod 3-14 upper end is rotatably connected on lower gear On 3-13, lower L-type connecting rod 3-14 lower end is hinged on lower hinge bar 3-17, and lower hinge bar 3-17 is slidably connected at gliding groove 3- In 15, lower hinge bar 3-17 rear end is welded on lower block 3-5, and slide 3-2 is slidably connected on screw rod 1-8.Slide 3-2 can To drive length control assembly 3 to be horizontally slipped on screw rod 1-8, two hollow stud 1-9 simultaneously opposite or back ofs the body on screw rod 1-8 The size that slide 3-2 horizontally slips on screw rod 1-8 can be controlled to movement, realizes the control to drawn rectangle width, up time Pin rotates swing handle 3-12, and swing handle 3-12 drives idler gear 3-11 to rotate clockwise, and idler gear 3-11 drives gear 3-10 Rotate counterclockwise, L-type connecting rod 3-9 is moved down in gear 3-10 drives, and upper L-type connecting rod 3-9 drives upper stopper 3-4 in round bar The upper slide downwards of 3-1, while idler gear 3-11 drives lower gear 3-13 to rotate counterclockwise, lower gear 3-13 drives lower L-type to connect Bar 3-14 is moved up, and lower L-type connecting rod 3-14 drives lower block 3-5 upward slidings on round bar 3-1, rotate counterclockwise swing handle 3- 12, upper stopper the 3-4 upward sliding on round bar 3-1, lower block 3-5 slide downwards on round bar 3-1, realize upper stopper 3-4 and Lower block 3-5 can slide up and down towards or away from motion, round bar seat 2-7 on round bar 3-1 simultaneously on round bar 3-1, upper gear Block 3-4 and lower block 3-5 on round bar 3-1 simultaneously towards or away from motion can control round bar seat 2-7 on round bar 3-1 up and down The size of slip, realize the control to drawn rectangle length.

Described chalk fixation kit 7 includes round bar seat 7-1, L-type L-square 7-2, connecting plate 7-3 and fixture 7-4, circle Manhole is provided with pole socket 7-1, round bar seat 7-1 left and right ends are respectively welded a L-type L-square 7-2, two L-types Connecting plate 7-3 is welded between L-square 7-2, connecting plate 7-3 front end is welded with fixture 7-4, round bar seat 7-1 rotation connections On L-square 2-5, round bar seat 7-1 is slidably connected on round bar 3-1.

Described fixture 7-4 includes open tubular column 7-4-1, Z-type pressing plate 7-4-2, slide bar 7-4-3 and holddown spring 7-4-4, Open tubular column 7-4-1 inwall upper end is welded with articulated column, and Z-type pressing plate 7-4-2 front end is hinged on open tubular column 7-4-1 inwalls On articulated column, open tubular column 7-4-1 upper end is provided with rectangular through-hole, and slide bar 7-4-3 upper end is slidably connected at open tubular column 7-4-1 On rectangular through-hole in, slide bar 7-4-3 lower end is welded on Z-type pressing plate 7-4-2 rear end, and compression is socketed with slide bar 7-4-3 Spring 7-4-4, holddown spring 7-4-4 are located between open tubular column 7-4-1 and Z-type pressing plate 7-4-2, open tubular column 7-4-1 rear end weldering It is connected on connecting plate 7-3, when chalk is inserted in open tubular column 7-4-1, the end of chalk is gradual from Z-type pressing plate 7-4-2 front end Z-type pressing plate 7-4-2 rear end is slided to, in chalk sliding process, Z-type pressing plate 7-4-2 rear end gradually moves up, simultaneously sliding Bar 7-4-3 upward slidings in the rectangular through-hole on open tubular column 7-4-1, holddown spring 7-4-4 is compacted, while holddown spring 7- Elastic force is transmitted to Z-type pressing plate 7-4-2 by 4-4, makes Z-type pressing plate 7-4-2 high resiliences, and Z-type pressing plate 7-4-2 is pressed in chalk table all the time Face, realize the fixation to chalk.

Rubber sleeve is bonded on described handle 6.

Scale value is carved with described screw rod 1-8 and round bar 3-1.

A kind of operation principle of higher mathematics picture rectangle teaching aid of the present invention：During use device, chalk is inserted in open tubular column Realize and fix in 2-6-2, carry handle 6, device is adsorbed by sucker 5 to be drawn on position in blackboard, start motor 1- 3, motor 1-3 drive picture component 2 to carry out 360 ° of rotations counterclockwise, and round bar seat 7-1 is driven in circle in the rotary course of picture component 2 Upward sliding on bar 3-1, when round bar seat 7-1 is when upward sliding meets upper stopper 3-4 on round bar 3-1, adjustable spring 2-4's Effect is lower to drive slide 3-2 to be slided to the left on screw rod 1-8 by round bar seat 7-1, when slide 3-2 encounters the sucker positioned at left end During seat 1-6, round bar seat 2-7 slide downwards on round bar 3-1 are driven by picture component 2 in the presence of adjustable spring 2-4, when When round bar seat 7-1 meets lower block 3-5, slide 3-2 is driven in screw rod by round bar seat 7-1 in the presence of adjustable spring 2-4 Slided to the right on 1-8, when slide 3-2 is encountered positioned at the sucker disk seat 1-6 of right-hand member, pass through picture in the presence of adjustable spring 2-4 Figure component 2 drives round bar seat 7-1 upward slidings on round bar 3-1, and drafting to rectangle, two hollow stud 1-9 are realized with this The simultaneously opposite or size that backwards to movement slide 3-2 can be controlled to be horizontally slipped on screw rod 1-8 on screw rod 1-8, is realized pair The control of drawn rectangle width, upper stopper 3-4 and lower block 3-5 can control towards or away from motion simultaneously on round bar 3-1 The size that round bar seat 7-1 is slided up and down on round bar 3-1, realize the control to drawn rectangle length.

Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, the art The variations, modifications, additions or substitutions that those of ordinary skill is made in the essential scope of the present invention, fall within the guarantor of the present invention Protect scope.

Claims (8)

1. a kind of higher mathematics picture rectangle teaching aid, including bracket component (1), picture component (2), length control assembly (3), skin Band (4), sucker (5), handle (6) and chalk fixation kit (7), it is characterised in that：Described bracket component (1) and picture component (2) it is rotatablely connected, length control assembly (3) is slidably connected with bracket component (1), between bracket component (1) and picture component (2) Belt (4) is connected with, sucker (5) shares two, and sucker (5) is bonded on bracket component (1), and bracket component is welded with (1) Handle (6), chalk fixation kit (7) are slidably connected with length control assembly (3).

A kind of 2. higher mathematics according to claim 1 picture rectangle teaching aid, it is characterised in that：Described bracket component (1) V-type frame (1-1), motor rack (1-2), motor (1-3), belt wheel (1-4), contiguous block (1-5), sucker disk seat (1-6), spiral shell are included Bridge (1-7), screw rod (1-8), hollow stud (1-9) and handle (1-10), the lower end of V-type frame (1-1) are welded with contiguous block (1- 5) manhole, is provided with contiguous block (1-5), the centre position of V-type frame (1-1) is welded with motor rack (1-2), motor (1- 3) it is fixed by screws on motor rack (1-2), belt wheel (1-4) is fixedly connected on motor (1-3) by machine shaft, V-type The left and right ends of frame (1-1) upper end are respectively welded a sucker disk seat (1-6), and screwed hole is provided with two sucker disk seats (1-6), A screw rod frame (1-7) is welded with positioned at the left end of the sucker disk seat (1-6) of left end, positioned at the right-hand member of the sucker disk seat (1-6) of right-hand member Be welded with a screw rod frame (1-7), screw rod (1-8) through two sucker disk seats (1-6) be rotatably connected on two screw rod framves (1-7) it Between, the left end of screw rod (1-8) is provided with plus thread, and the right-hand member of screw rod (1-8) is provided with left-hand thread, the left and right two of screw rod (1-8) End is rotatably connected to a hollow stud (1-9) respectively, and the inner ring of two hollow studs (1-9) and outer ring are provided with screw thread, The outer ring of two hollow studs (1-9) coordinates with the screwed hole on sucker disk seat (1-6) respectively, and the left end of screw rod (1-8), which is fixed, to be connected Be connected to handle (1-10), the front ends of two sucker disk seats (1-6) is respectively welded a sucker (5), two sucker disk seats (1-6) it is upper End is welded with handle (6).

A kind of 3. higher mathematics according to claim 2 picture rectangle teaching aid, it is characterised in that：Described picture component (2) inserted link (2-1), bull stick (2-2), socket (2-3), adjustable spring (2-4) and L-square (2-5) are included, after socket (2-3) End is welded with bull stick (2-2), and bull stick (2-2) is rotatably connected on contiguous block (1-5), is connected between belt wheel (1-4) and bull stick (2-2) Belt (4) is connected to, the left end of inserted link (2-1) is slidably connected on socket (2-3), and the right-hand member of inserted link (2-1) is welded with L-square (2-5), adjustable spring (2-4) is socketed with inserted link (2-1), adjustable spring (2-4) is located at socket (2-3) and L-square (2-5) Between.

A kind of 4. higher mathematics according to claim 3 picture rectangle teaching aid, it is characterised in that：Described length control group Part (3) includes round bar (3-1), slide (3-2), gear circle (3-3), upper stopper (3-4), lower block (3-5), coulisse (3-6), tooth Wheel seat (3-7), upper hopper chute (3-8), upper L-type connecting rod (3-9), gear (3-10), idler gear (3-11), swing handle (3-12), Lower gear (3-13), lower L-type connecting rod (3-14), gliding groove (3-15), upper hinge bar (3-16) and lower hinge bar (3-17), round bar The upper end of (3-1) is welded with slide (3-2), and the upper end of slide (3-2) is cylinder, and the lower end of slide (3-2) is rectangular configuration, The upper end of slide (3-2) is provided with manhole, and the lower end of round bar (3-1) is welded with gear circle (3-3), upper stopper (3-4) and under Block (3-5) is symmetrically slidably connected at round bar (3-1) upper and lower ends, and round bar seat (2-7) is slidably connected on round bar (3-1), Coulisse (3-6) is welded between slide (3-2) and gear circle (3-3), the upper end of coulisse (3-6) is provided with upper hopper chute (3-8), The lower end of coulisse (3-6) is provided with gliding groove (3-15), and the centre position of coulisse (3-6) is welded with pinion stand (3-7), in Between gear (3-11) be rotatably connected on pinion stand (3-7) centre position by gear shaft, it is fixed on idler gear (3-11) to connect Swing handle (3-12) is connected to, gear (3-10) is rotatably connected on pinion stand (3-7) upper end, upper L-type connecting rod (3- by gear shaft 9) lower end is rotatably connected on gear (3-10), and the upper end of upper L-type connecting rod (3-9) is hinged on hinge bar (3-16), Upper hinge bar (3-16) is slidably connected in upper hopper chute (3-8), and the rear end of upper hinge bar (3-16) is welded on upper stopper (3-4) On, lower gear (3-13) is rotatably connected on pinion stand (3-7) lower end by gear shaft, and the upper end of lower L-type connecting rod (3-14) turns Dynamic to be connected on lower gear (3-13), the lower end of lower L-type connecting rod (3-14) is hinged on lower hinge bar (3-17), lower hinge bar (3-17) is slidably connected in gliding groove (3-15), and the rear end of lower hinge bar (3-17) is welded on lower block (3-5), slide (3-2) is slidably connected on screw rod (1-8).

A kind of 5. higher mathematics according to claim 4 picture rectangle teaching aid, it is characterised in that：Described chalk fixation group Part (7) includes round bar seat (7-1), L-type L-square (7-2), connecting plate (7-3) and fixture (7-4), is set on round bar seat (7-1) Manhole is equipped with, the left and right ends of round bar seat (7-1) are respectively welded a L-type L-square (7-2), two L-type L-squares Connecting plate (7-3) is welded between (7-2), the front end of connecting plate (7-3) is welded with fixture (7-4), and round bar seat (7-1) rotates It is connected on L-square (2-5), round bar seat (7-1) is slidably connected on round bar (3-1).

A kind of 6. higher mathematics according to claim 5 picture rectangle teaching aid, it is characterised in that：Described fixture (7- 4) open tubular column (7-4-1), Z-type pressing plate (7-4-2), slide bar (7-4-3) and holddown spring (7-4-4), open tubular column (7-4-1) are included Inwall upper end be welded with articulated column, the front end of Z-type pressing plate (7-4-2) is hinged on the articulated column on open tubular column (7-4-1) inwall On, the upper end of open tubular column (7-4-1) is provided with rectangular through-hole, and the upper end of slide bar (7-4-3) is slidably connected at open tubular column (7-4-1) On rectangular through-hole in, the lower end of slide bar (7-4-3) is welded on Z-type pressing plate (7-4-2) rear end, is socketed on slide bar (7-4-3) There is holddown spring (7-4-4), holddown spring (7-4-4) is located between open tubular column (7-4-1) and Z-type pressing plate (7-4-2), open tubular column The rear end of (7-4-1) is welded on connecting plate (7-3).

A kind of 7. higher mathematics according to claim 1 picture rectangle teaching aid, it is characterised in that：On described handle (6) It is bonded rubber sleeve.

A kind of 8. higher mathematics according to claim 4 picture rectangle teaching aid, it is characterised in that：Described screw rod (1-8) Scale value is carved with round bar (3-1).