CN207165060U - A kind of mathematics teaching aid - Google Patents

Abstract

The utility model discloses a kind of mathematics teaching aid, including cylinder, the bottom of the cylinder is installed with leg, the side of the cylinder inboard wall is slidably fitted with rack, and the side of cylinder offers groove, the internal slide of groove is provided with sliding block, and the side of sliding block extends to the inside of cylinder and is fixedly connected with the side of rack, cylinder is internally provided with gear, wheel and rack engagement.The cooperation that the utility model passes through rack, gear, worm and worm wheel, by by lower platen, so that sliding block band carry-over bar moves down, it can be rotated when rack moves with moving gear, worm screw can be driven to be rotated when gear is rotated, so that worm gear drives rotating shaft to be rotated, rotor plate can be driven to be rotated when the spindle is rotated, so that the paintbrush in rotating bar carries out rotating picture circle around leg, because the leg of compasses does not rotate, it is moved so as to avoid fulcrum, causes picture to justify the problem of failing.

Description

A kind of mathematics teaching aid

Technical field

Mathematics teaching aid technical field is the utility model is related to, specially a kind of mathematics teaching aid.

Background technology

Mathematics (mathematics or maths), it is study the concepts such as quantity, structure, change, space and information one Door subject, one kind of formal science is belonged in terms of certain angle, and in development of human history and social life, mathematics also plays Irreplaceable effect, and learns and studies the essential basic tool of modern science and technology, in the mistake of mathematical studying Mathematics teaching aid is often used in journey and carries out CAL.

Mathematics teaching aid refers to the required teaching work used during learning mathematicses such as abacus, engineer's scale, slide ruler Tool, compasses are a kind of very useful instruments for being used for picture circle and arc in mathematics teaching aid, but existing compasses are using During, it is necessary to rotate compasses by hand, picture circle could be carried out, but compasses fulcrum stability during rotation is inadequate, Easily fulcrum is set to be moved, so as to cause picture circle failure.

Utility model content

The purpose of this utility model is to provide a kind of mathematics teaching aid possess the advantages of picture circle is accurate, solve background skill The existing compasses mentioned in art, it is necessary to rotate compasses by hand, could carry out picture circle, but compasses are turning during use Fulcrum stability is inadequate in dynamic process, easily fulcrum is moved, so as to cause picture to justify the problem of failing.

To achieve the above object, the utility model provides following technical scheme：A kind of mathematics teaching aid, including cylinder, it is described The bottom of cylinder is installed with leg, and the side of the cylinder inboard wall is slidably fitted with rack, and the side of cylinder offers Groove, the internal slide of groove are provided with sliding block, and the side of sliding block extends to the inside of cylinder and is fixedly connected with the side of rack, Cylinder is internally provided with gear, wheel and rack engagement, and worm screw is provided through at the axle center of gear, the both ends point of worm screw It is not flexibly connected with the front and back of cylinder inboard wall, the bottom of cylinder is movably installed with rotating shaft, the surface of rotating shaft by bearing And worm gear is socketed with the position of corresponding worm screw, worm gear is connected with worm-drive.

The surface of worm screw is socketed with rotor plate, and cylinder is extended in the outer surface of rotor plate, and between rotor plate and cylinder It is flexibly connected, the side that swivel becket extends cylinder opens up fluted, and the inside of groove is installed with hinge bar, hinge bar Outer surface is socketed with rotating bar, and the bottom of rotating bar passes groove and extends to the lower section of rotor plate and be movably installed with paintbrush.

Preferably, the outer surface of the paintbrush is socketed with crane, and rotating bar through crane and with crane screw thread Connection.

Preferably, side of the sliding block away from rack passes groove and is fixedly connected with the side of pressing plate, is set on pressing plate Pointer is equipped with, and the scale to match with pointer is provided with cylinder.

Preferably, the bottom of the leg is provided with leg pin.

Preferably, the bottom of the groove inwall is installed with spring, and the top of spring and the bottom of sliding block, which are fixed, to be connected Connect.

Preferably, the internal activity of the rotor plate is provided with ball, and the bottom of ball and bottom pass rotor plate It is flexibly connected with the side wall of cylinder.

Compared with prior art, the beneficial effects of the utility model are as follows：

1st, the utility model is by the cooperation of rack, gear, worm and worm wheel, by by lower platen, so that sliding block band Carry-over bar moves down, and can be rotated when rack moves with moving gear, when gear is rotated worm screw can be driven to carry out Rotate, so that worm gear drives rotating shaft to be rotated, rotor plate can be driven to be rotated when the spindle is rotated, so that rotating bar On paintbrush around leg carry out rotate picture circle, because the leg of compasses does not rotate, be moved, lead so as to avoid fulcrum The problem of causing picture circle to fail.

2nd, the utility model is by setting groove, hinge bar and rotating bar, so that rotating bar can be in rotor plate upper measurement Rotated around hinge bar, so as to adjust the radius of picture circle, and simultaneously, by rotating crane, rotated so as to adjust paintbrush Height on bar, so that when rotating rotating bar, paintbrush still can contact with paper, so as to reach the effect of regulation picture radius of circle Fruit.

Brief description of the drawings

Fig. 1 is the structural representation of the utility model side view；

Fig. 2 is the schematic diagram that the utility model structure is overlooked；

Fig. 3 is the internal structure schematic diagram of the utility model structure cylinder.

In figure：1 cylinder, 2 racks, 3 gears, 4 worm screws, 5 rotating shafts, 6 worm gears, 7 grooves, 8 sliding blocks, 9 rotor plates, 10 grooves, 11 hinge bars, 12 rotating bars, 13 paintbrushes, 14 cranes, 15 pressing plates, 16 pointers, 17 legs, 18 leg pins, 19 springs, 20 rollings Pearl.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment obtained, belong to the scope of the utility model protection.

Fig. 1-3, a kind of mathematics teaching aid, including cylinder 1 are referred to, the bottom of cylinder 1 is installed with leg 17, leg 17 Bottom be provided with leg pin 18, by setting leg pin 18, so that the position that leg is fixed is more stable, in cylinder 1 The side of wall is slidably fitted with rack 2, and the side of cylinder 1 offers groove 7, and the internal slide of groove 7 is provided with sliding block 8, The bottom of the inwall of groove 7 is installed with spring 19, and the top of spring 19 is fixedly connected with the bottom of sliding block 8, by setting bullet Spring 19 is resetted, and so as to draw circle convenient next time, the inside that the side of sliding block 8 extends to cylinder 1 is fixedly connected with the side of rack 2, Side of the sliding block 8 away from rack 2 passes groove 7 and is fixedly connected with the side of pressing plate 15, and pointer 16 is provided with pressing plate 15, and The scale to match with pointer 16 is provided with cylinder 1, more calculates distance that pressing plate 15 pushes so that rotor plate 9 rotates Angle be configured scale so that draw camber line when it is more accurate, cylinder 1 is internally provided with gear 3, gear 3 and tooth Bar 2 is engaged, and worm screw 4 is provided through at the axle center of gear 3, the both ends of worm screw 4 front and back with the inwall of cylinder 1 respectively It is flexibly connected, the bottom of cylinder 1 is movably installed with rotating shaft 5, and the top of rotating shaft 5 and the top of the inwall of cylinder 1 by bearing Active link, make to be attached positioned at the cylinder 1 of the lower section of rotor plate 9 and the cylinder above rotor plate 9 by turning 5, rotating shaft 5 Surface and the position of corresponding worm screw 4 on be socketed with worm gear 6, worm gear 6 is connected with worm screw 4, by rack 2, gear 3, Worm screw 4 and the cooperation of worm gear 6, by by lower platen 15, so that sliding block 8 moves down with carry-over bar 2, when rack 2 moves It can be rotated with moving gear 3, when gear 3 is rotated worm screw 4 can be driven to be rotated, so that worm gear 6 drives rotating shaft 5 Rotated, when rotating shaft 5 rotates rotor plate 9 can be driven to be rotated, so that the paintbrush 13 in rotating bar 12 surrounds leg 17 carry out rotating picture circle.

The surface of worm screw 4 is socketed with rotor plate 9, and cylinder 1, the internal activity of rotor plate 9 are extended in the outer surface of rotor plate 9 Ball 20 is installed, and the bottom of ball 20 and bottom pass rotor plate 9 and be flexibly connected with the side wall of cylinder 1, are opened on cylinder 1 Provided with opening, rotor plate 9, which passes, to be open and extends to the outside of cylinder 1, and the inwall of overthe openings and the inwall of lower section open up Have deep-slotted chip breaker, the bottom and top of ball 20 are respectively positioned in deep-slotted chip breaker, and can internally be rolled, and rotor plate 9 with It is flexibly connected between cylinder 1, the side that swivel becket 9 extends cylinder 1 opens up fluted 10, and the inside of groove 10 is fixedly mounted There is hinge bar 11, the outer surface of hinge bar 11 is socketed with rotating bar 12, and the bottom of rotating bar 12, which passes groove 10 and extended to, to be turned The lower section of dynamic plate 9 is simultaneously movably installed with paintbrush 13, and the outer surface of paintbrush 13 is socketed with crane 14, and rotating bar 12 is through lifting Frame 14 is simultaneously threadedly coupled with crane 14, by setting groove 10, hinge bar 11 and rotating bar 12, so that rotating bar 12 can be with Rotated on rotor plate 9 around hinge bar 11, so as to adjust the radius of picture circle, and simultaneously, by rotating crane 14, from And height of the paintbrush 13 in rotating bar 12 is adjusted, so that when rotating rotating bar 12, paintbrush 13 still can contact with paper.

In use, pinning the top of cylinder 1 with forefinger, pressing plate 15 then is pressed down on thumb, when pressing plate 15 is to moving down When dynamic sliding block 8 can be made to be moved down with carry-over bar 2, when rack 2 moves can band moving gear 3 being rotated, when 3 turns of gear When dynamic worm screw 4 can be driven to be rotated, be driven by worm screw 4 and worm gear 6, so that worm gear 6 drives rotating shaft 5 to be rotated, when Rotating shaft 5 can drive rotor plate 9 to be rotated when rotating, so that the paintbrush 13 in rotating bar 12 carries out rotation picture around leg 17 Circle.

In summary：The utility model is by the cooperation of rack 2, gear 3, worm screw 4 and worm gear 6, by by lower platen 15, So that sliding block 8 moves down with carry-over bar 2, can be rotated when rack 2 moves with moving gear 3, when gear 3 is rotated When worm screw 4 can be driven to be rotated so that worm gear 6 drive rotating shaft 5 rotated, can drive rotor plate 9 when rotating shaft 5 rotates Rotated, so that the paintbrush 13 in rotating bar 12 carries out rotating picture circle around leg 17, because the leg 17 of compasses does not have Rotate, be moved so as to avoid fulcrum, cause picture to justify the problem of failing.

The utility model is by setting groove 10, hinge bar 11 and rotating bar 12, so that rotating bar 12 can rotate Rotated on plate 9 around hinge bar 11, so as to adjust the radius of picture circle, and simultaneously, by rotating crane 14, so as to adjust Height of the paintbrush 13 in rotating bar 12, so that when rotating rotating bar 12, paintbrush 13 still can contact with paper, so as to reach Adjust the effect of picture radius of circle.

It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row His property includes, so that process, method, article or equipment including a series of elements not only include those key elements, and And also include the other element being not expressly set out, or also include for this process, method, article or equipment institute inherently Key element.

While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art, It is appreciated that these embodiments can be carried out with a variety of changes in the case where not departing from principle of the present utility model and spirit, repaiied Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.

Claims (6)

1. a kind of mathematics teaching aid, including cylinder (1), the bottom of the cylinder (1) is installed with leg (17), and its feature exists In：The side of cylinder (1) inwall is slidably fitted with rack (2), and the side of cylinder (1) offers groove (7), groove (7) internal slide is provided with sliding block (8), and the side of sliding block (8) extends to the inside of cylinder (1) and the side of rack (2) is consolidated Fixed connection, cylinder (1) are internally provided with gear (3), and gear (3) engages with rack (2), and runs through at the axle center of gear (3) It is provided with worm screw (4), the front and back of the both ends of worm screw (4) respectively with cylinder (1) inwall is flexibly connected, the bottom of cylinder (1) Portion is movably installed with rotating shaft (5) by bearing, and worm gear is socketed with the surface of rotating shaft (5) and the position of corresponding worm screw (4) (6), worm gear (6) is connected with worm screw (4)；

The surface of worm screw (4) is socketed with rotor plate (9), and cylinder (1) is extended in the outer surface of rotor plate (9), and rotor plate (9) with Cylinder is flexibly connected between (1), and the side that swivel becket (9) extends cylinder (1) opens up fluted (10), groove (10) it is interior Portion is installed with hinge bar (11), and the outer surface of hinge bar (11) is socketed with rotating bar (12), and the bottom of rotating bar (12) is worn Go out groove (10) and extend to the lower section of rotor plate (9) and be movably installed with paintbrush (13).

A kind of 2. mathematics teaching aid according to claim 1, it is characterised in that：The outer surface of the paintbrush (13) is socketed with liter Frame (14) is dropped, and rotating bar (12) is threadedly coupled through crane (14) and with crane (14).

A kind of 3. mathematics teaching aid according to claim 1, it is characterised in that：Side of the sliding block (8) away from rack (2) Pass groove (7) and be fixedly connected with the side of pressing plate (15), pointer (16) is provided with pressing plate (15), and set on cylinder (1) It is equipped with the scale to match with pointer.

A kind of 4. mathematics teaching aid according to claim 1, it is characterised in that：The bottom of the leg (17) is provided with leg Pin (18).

A kind of 5. mathematics teaching aid according to claim 1, it is characterised in that：Peace is fixed in the bottom of groove (7) inwall Equipped with spring (19), the top of spring (19) is fixedly connected with the bottom of sliding block (8).

A kind of 6. mathematics teaching aid according to claim 1, it is characterised in that：The internal activity installation of the rotor plate (9) There is ball (20), and the bottom of ball (20) and bottom pass rotor plate (9) and be flexibly connected with the side wall of cylinder (1).