CN207833738U - A kind of math teaching tool for primary school - Google Patents

Abstract

A kind of math teaching tool for primary school belongs to teaching aid technical field.It is characterized in that：Shell（1）Same side be equipped with three digital displaying windows, number of one group of border equipped with different digital is correspondingly provided in each digital displaying window and shows that wheel disc, every group of number show that wheel disc is rotatably arranged on shell by wheel disc rotating shaft mechanism（1）Interior, connection driving shaft is engaged in three groups of wheel disc rotating shaft mechanism inner ends jointly（26）, driving shaft（26）Outer end be equipped with rotation handwheel（24）；And number shows and is respectively equipped with clutch between wheel disc and every group of wheel disc rotating shaft mechanism outer end.The digital and after being added result that two are added is respectively displayed in window by the utility model, it can intuitively show the relationship between three, and each number shows that wheel disc and the rotation of wheel disc rotating shaft mechanism are replaced by set of number respectively, three groups of wheel disc rotating shaft mechanisms drive rotation simultaneously further through driving shaft, it can realize under the control of respective clutch and individually rotate or stop again.

Description

A kind of math teaching tool for primary school

Technical field

A kind of math teaching tool for primary school belongs to teaching aid technical field.

Background technology

First-year student want expertly to do a sum orally one digit number addition and corresponding subtraction, double figures plus-minus whole ten or one Digit；To within the addition and subtraction and 20 of the number within 10 carry addition and subtraction of giving up the throne, by training wants to reach de- mouth The qualification gone out, it is seen that the oral arithmetic training of a grade mathematics is that a critically important skill math skills are trained.So in teaching Reinforce oral arithmetic training, it is the focal points and teaching difficulty of a grade mathematics to promote the raising of computing capability.

Due to the abstractness of mathematical knowledge itself, the bad understanding of the students of the junior years, the thinking of a pupil mainly with Based on concrete image thinking, their abstract ability is mainly in visual in image level.So grade mathematics teaching is necessary By material object, teaching aid, number finger, the specific object operation of pendulum card etc., based on being divided into of the number within 10, lead student by Migration and expansion of the old knowledge to new knowledge, student can just realize the enjoyment of learning mathematics.It is gradually grasped within 10 with this Plus and minus calculation within plus and minus calculation, 20, double-digit plus and minus calculation accomplish fluently heavily fortified point as more higher leveled mathematical operation later Real basis.

But current existing mathematics teaching aid is more mechanical, lacks lively demo mode, pupil is during study A relatively more intuitive impression can not be obtained, actual operation also lacks interest, and therefore, practicability is not strong, teaching efficiency It is undesirable.

Invention content

Technical problem to be solved in the utility model is：It is straight to overcome the deficiencies of the prior art and provide a kind of bandwagon effect It sees, is lively, student can effectively improve the primary school mathematics of actual operation teaching with autonomous operation on the basis of increasing interesting Teaching aid.

The utility model solve its technical problem the technical solution adopted is that：The math teaching tool for primary school, it is characterised in that：Packet Shell, digital displaying window and digital tumbler are included, the number there are three distribution triangular in shape is set on the same side of shell Display window is correspondingly provided with number of one group of border equipped with different digital in each digital displaying window and shows wheel disc, every group of number Word shows that wheel disc is rotatably arranged on by wheel disc rotating shaft mechanism in shell, and connection master is engaged in three groups of wheel disc rotating shaft mechanism inner ends jointly The outer end of moving axis, driving shaft is equipped with rotation handwheel；And number shows and divides between wheel disc and every group of wheel disc rotating shaft mechanism outer end It She You not clutch.

Digital displaying window is set as three by the utility model, i.e., by the number of two additions of simple mathematics addition and subtraction Word and result after being added are respectively displayed in window, can intuitively show the relationship between three, and each number It can show that wheel disc and the rotation of wheel disc rotating shaft mechanism are replaced by set of number, three groups of wheel disc rotating shaft mechanisms are same further through driving shaft When drive rotation, and can under the control of respective clutch, realize individually rotate or stop.The utility model uses Object operation establishes presentation and inspires observation of students, leads student to understand calculation reason by practical operation, breaks through this teaching difficulty.

The effective defect for avoiding primary grades child and lacking demonstration in kind for the understanding of some abstract problems, this reality A kind of hands-on experimental learning is formd with novel structure, has effectively deepened understanding of the student to knowledge.Institute With when being divided into plus and minus calculation of number within teaching 10, teaching aid is made full use of, by the practical hands-on teaching aid of guiding student, It allows student first to understand up from the understanding of perception, and then grasps new knowledge more securely.The personal body that student passes through operation teaching aid Test, can find pleasure in operation, can learn within 10 number be divided into and plus and minus calculation.Experience, student couple are attempted by doing it yourself Several calculation reason impression just can be more deep, and the operation for later more higher leveled number is laid a solid foundation.

The number shows that the outer edge surface of wheel disc is divided into the region of 12 equal portions, and the uniformly distributed 0-10 of annular on the area 11 numbers, and set there are one space.

The wheel disc rotating shaft mechanism includes bevel gear, shaft, bearing block and bearing bracket, shaft by bearing block and Bearing bracket is rotatably installed in shell, and bearing bracket lower part is fixed on the bottom in shell, and inner end installs bevel gear, Outer end stretches out shell and connects clutch, and the number shows that wheel disc is fixedly connected with shaft by wheel disc positioning screw.

The number is shown is equipped with wheel disk-positioning mechanism between inner walls on the outside of wheel disc, wheel disk-positioning mechanism includes Steel ball, spring and positioning disk, positioning disk outer end face are fixed in inner walls, and positioning disk inner face is allowed equipped with multiple The groove that steel ball is placed；Number shows that wheel disc outer end face is equipped with the slot for placing spring, and steel ball is placed between spring and groove.

Groove on the positioning disk shows that the digital numerical in the outer rim of wheel disc is identical with number.

The clutch includes washer, clutch main body, compression spring, screw and flat key, and clutch main body is with endoporus Cylinder, inner barrel suit outer end is cased with the screw of washer, the external flat key again with endoporus of cylinder inner end, screw Inner end passes through flat key to be threadedly coupled number and shows wheel disc and wheel disc rotating shaft mechanism.

The lower part that the shell is equipped with the side of digital displaying window is equipped with the abacus bead that multiple slidings are arranged.

Compared with prior art, advantageous effect possessed by the utility model is：The utility model is by digital displaying window Three are set as, i.e. the digital and after being added result by two additions of simple mathematics addition and subtraction is respectively displayed on window It is interior, it can intuitively show the relationship between three, and each number can show that wheel disc and wheel disc turn by set of number Axis mechanism rotation is replaced, and three groups of wheel disc rotating shaft mechanisms drive rotation simultaneously further through driving shaft, and can be in respective clutch Control under, realize individually rotate or stop.

Understanding of the primary grades child for some abstract problems effectively is avoided, lacks the defect of visual illustration, this reality A kind of hands-on experimental learning is formd with novel structure, has effectively deepened memory of the student to knowledge.Institute With when being divided into plus and minus calculation of number within teaching 10, teaching aid is made full use of, by the practical hands-on teaching aid of guiding student, It allows student first to understand up from the understanding of perception, and then grasps new knowledge more securely.The personal body that student passes through operation teaching aid Test, can find pleasure in operation, can learn within 10 number be divided into and plus and minus calculation.Experience, student couple are attempted by doing it yourself Several calculation reason impression just can be more deep, and the operation for later more higher leveled number is laid a solid foundation.

Description of the drawings

Fig. 1 is the internal structure schematic diagram of math teaching tool for primary school.

Fig. 2 is the A-A schematic cross-sectional views of Fig. 1.

Fig. 3 is the left view schematic diagram of Fig. 1.

Fig. 4 is the surface structure schematic diagram of Fig. 1.

Fig. 5 is that clutch is in closed state schematic diagram.

Fig. 6 is that clutch is in open state schematic diagram.

Fig. 7 is wheel disk-positioning mechanism schematic view of the mounting position.

Wherein, 1, shell 2, wheel disc A bevel gears 3, bearing block fixing screws 4, clutch A 401, washer 402, from Clutch main body 403, compression spring 404, screw 405, flat key 5, wheel disc A axis 6, wheel disc A 7, wheel disc A bearing blocks 8, wheel disc A axis Base supporting 9, window A 10, window B 11, window C 12, driving pinion bearing housing holder 13, wheel disc C bearing blocks 14, Abacus bead 15, wheel disc B bevel gears 16, abacus bead fixing axle 17, wheel disc B 18, wheel disc B axle base supporting 19, clutch B 20, wheel disc B axle bearing 21, bearing block fixing screws 22, bearing block fixing screws 23, wheel disk-positioning mechanism 231, steel ball 232, spring 233, positioning disk 24, rotation handwheel 25, driving pinion bearing housing 26, driving shaft 27, drive bevel gear 28, wheel disc C bevel gears 29, wheel disc C axis 30, clutch C 31, wheel disc C 32, wheel disc B axle 33, wheel disc positioning screw.

Specific implementation mode

Fig. 1 ~ 7 are the most preferred embodiments of the utility model, and 1 ~ 7 pair of the utility model is done furtherly below in conjunction with the accompanying drawings It is bright.

With reference to attached drawing 1 ~ 7：A kind of math teaching tool for primary school, including shell 1, digital displaying window and digital tumbler, shell The digital displaying window there are three distribution triangular in shape is set on the same side of body 1, is correspondingly provided in each digital displaying window The number that one group of border is equipped with different digital shows that wheel disc, every group of number show that wheel disc is rotatably arranged on by wheel disc rotating shaft mechanism In shell 1, connection driving shaft 26 is engaged in three groups of wheel disc rotating shaft mechanism inner ends jointly, and the outer end of driving shaft 26 is equipped with rotation handwheel 24；And number shows and is respectively equipped with clutch between wheel disc and every group of wheel disc rotating shaft mechanism outer end.

Number shows that the outer edge surface of wheel disc is divided into the region of 12 equal portions, and 11 of the uniformly distributed 0-10 of annular on the area Number, and set there are one space.

Wheel disc rotating shaft mechanism includes bevel gear, shaft, bearing block and bearing bracket, and shaft passes through bearing block and bearing block Holder pivots are mounted in shell 1, and bearing bracket lower part is fixed on the bottom in shell 1, and inner end installs bevel gear, outer end Portion stretches out shell 1 and connects clutch, and number shows that wheel disc is fixedly connected with shaft by wheel disc positioning screw 33.

Number is shown is equipped with wheel disk-positioning mechanism 23 between 1 inner wall of shell on the outside of wheel disc, wheel disk-positioning mechanism 23 includes Steel ball 231, spring 232 and positioning disk 233,233 outer end face of positioning disk are fixed on 1 inner wall of shell, 233 inner end of positioning disk Face is equipped with multiple grooves for allowing steel ball 231 to place；Number shows that wheel disc outer end face is equipped with the slot for placing spring 232, Steel ball 231 is placed between spring 232 and groove.Groove on positioning disk 233 shows the digital number in the outer rim of wheel disc with number It measures identical.

Clutch includes washer 401, clutch main body 402, compression spring 403, screw 404 and flat key 405, clutch main body 402 be the cylinder with endoporus, and inner barrel suit outer end is cased with the screw 404 of washer 401, and cylinder inner end is external same Flat key 405 with endoporus, 404 inner end of screw are threadedly coupled number across flat key 405 and show wheel disc and wheel disc rotating shaft mechanism. The lower part that shell 1 is equipped with the side of digital displaying window is equipped with the abacus bead 14 that multiple slidings are arranged.Abacus bead fixing axle 16 is pacified 12 ~ 20 abacus beads 14 are filled, for assisting dynamic calculating.

Operation principle and the course of work：Rotate handwheel 24 drive driving shaft 26 rotate, drive bevel gear 27 by flat key with Driving shaft 26 links together, therefore drive bevel gear 27 also rotates therewith.Drive bevel gear 27 is simultaneously with runner disc B bevel gears 15, wheel disc C bevel gears 28, wheel disc A bevel gears 2 rotate together.Wheel disc A bevel gears 2 rotate with runner disc A 6；Wheel disc B bevel gears 15 band runner disc B 17 are rotated；Wheel disc C bevel gears 28 rotate with runner disc C31.Due to wheel disc A6, wheel disc B17, wheel disc C31 with Clutch A 4, clutch B19, clutch C30 are mounted between corresponding wheel disc A axis 5, wheel disc B axle 32, wheel disc C axis 29, i.e., When rotating the rotation of handwheel 24, wheel disc A6, wheel disc B17, wheel disc C31 can be rotated simultaneously, can also be rotated respectively, can be also simultaneously stopped Rotation.

Wheel disc A6, wheel disc B17, wheel disc C31 outer rim be carved with 11 numbers of 0-10, and there are one spaces.It turns to not Same position, can have window A9, window B 10, window C11 to show different numbers.It takes turns disk-positioning mechanism 23 and is used for wheel disc Positioning.Positioning disk 233 is welded on shell 1.The outer rim number of upper and wheel disc A6, wheel disc B17, wheel disc C31 are bored on positioning disk The hole of identical quantity, wheel disc rotate an angle, and steel ball 231 is pressed under the pressure of spring 232 in the hole of positioning disk, realize Positioning.

A flat key 405 is welded in the lower end of clutch main body 402, a hole is provided among flat key 405, is used for screw 404 Pass through.A upper elongated slot, the flat key for installing clutch main body are processed in the section of wheel disc A 6, wheel disc B17, wheel disc C31. A screw hole is processed on other end, for installing wheel disc positioning screw 33, prevents wheel disc from moving axially.The upper length of processing in end face Slot, the flat key for installing clutch main body 402.Feature is that the end of axis is slightly above turntable end face, the end centre of axis A threaded hole is processed, mounting screw 404 is used for.A upper annular groove is processed in the left side of axis platform rank, for installing wheel disc positioning Screw 33.

According to clutch device figure, screw 404 is screwed into the end thread hole of axis, compression spring 403 is compressed, and flat key is worked as When in 405 insertion wheel discs and the elongated slot of roller end, shaft and wheel disc are connected to one.At this point, clutch is in bonding state, See Fig. 5.Axial to pull clutch main body 402, compression spring 403 is further compressed, when flat key 405 is departing from elongated slot, clutch Device main body 402 rotates 90 degree, lets go at this time, flat key 405 is pressed in the end of shaft, since the end of shaft is slightly above turntable end Face, shaft and wheel disc separation, at this point, clutch is in discrete state, are shown in Fig. 6.

With the method described when operating teaching aid, the decomposition and synthesis of number that child intuitively experiences within 10 can be allowed Process, help child to understand the meaning of " decompositions " " synthesis ", lay a solid foundation for the plus and minus calculation within skillfully grasp 10.

This method is practiced more, is remarkably contributing to child and understands and masters several be divided into.Moreover, it is several be segmented into it is several and several, Several and several synthesis are several, preferably orderly said by point-score, on the one hand can be memonic point and conjunction, can also training student language Ability to express.The culture of mathematical linguistics ability to express is also the culture to Mathematical Thinking Ability.Study application after in particular to When topic, the expression of mathematical linguistics is even more important to solving the problems, such as.

Three lead student to complete to be divided into conversion between symbol and addition and subtraction, we can according to the shape for being divided into symbol, They are visually named as：One top and two sharp triangle patterns, withstand on top, two points are respectively in the lower part on top The right and left.Student is allowed to find that the number on " point " is sum, the number on " side " in point thing of starting is contacted with the comparison being divided into For part, nursery rhymes " point sum, rim portion " are summarized as, student is allowed deeply " to understand that quantitative relation and variation represented by symbol are advised Rule ".

The meaning of "+" be by two parts altogether, the meaning of "-" is to remove a part from sum.Both meanings exist Being divided into has certain mapping in symbol.Therefore, the method that " being divided into " can be used when calculating addition and subtraction.

Student completes to be divided into conversion between symbol and addition and subtraction, calculating speed can be improved and consolidate grasp 10 with The operation of interior addition and subtraction.It is understood that the plus and minus calculation within 10 is the basis of all integer calculations, children learn well within 10 Operation, can greatly enhance them and learn the self-confidence of mathematics well, improve learning efficiency, save learning time, and can take exercise Student thought.

The plus and minus calculation of number is the basis of the plus and minus calculation of number within 20 within 10, and the operation counted within 20 is long number again The basis of operation, it is critically important thus to instruct child to learn plus and minus calculation within 10 well.Carry addition within 20, giving up the throne subtracts The skilled grasp of method, the composition largely depended within student couple 10 and the qualification decomposed.As long as student is 20 Within carry addition, subtraction of giving up the throne grasp it is skilled, within hundred number addition and subtraction calculate the vertical calculating of study .

The above descriptions are merely preferred embodiments of the present invention, is not to make other forms to the utility model Limitation, any person skilled in the art is changed or is modified as possibly also with the technology contents of the disclosure above equivalent The equivalent embodiment of variation.But it is every without departing from the content of the technical scheme of the utility model, the technology according to the utility model is real Any simple modification, equivalent variations and remodeling, still fall within the guarantor of technical solutions of the utility model made by confrontation above example Protect range.

Claims (7)

1. a kind of math teaching tool for primary school, it is characterised in that：Including shell（1）, digital displaying window and digital tumbler, shell （1）Same side on set digital displaying window there are three distribution triangular in shape, be correspondingly provided in each digital displaying window The number that one group of border is equipped with different digital shows that wheel disc, every group of number show that wheel disc is rotatably arranged on by wheel disc rotating shaft mechanism Shell（1）Interior, connection driving shaft is engaged in three groups of wheel disc rotating shaft mechanism inner ends jointly（26）, driving shaft（26）Outer end be equipped with turn It starts to take turns（24）；And number shows and is respectively equipped with clutch between wheel disc and every group of wheel disc rotating shaft mechanism outer end.

2. a kind of math teaching tool for primary school according to claim 1, it is characterised in that：The number shows the outer rim of wheel disc Face is divided into the region of 12 equal portions, and 11 numbers of the uniformly distributed 0-10 of annular on the area, and sets that there are one spaces.

3. a kind of math teaching tool for primary school according to claim 1, it is characterised in that：The wheel disc rotating shaft mechanism includes cone Gear, shaft, bearing block and bearing bracket, shaft are rotatably installed in shell by bearing block and bearing bracket（1）It is interior, axis Base supporting lower part is fixed on shell（1）Interior bottom, inner end install bevel gear, and shell is stretched out in outer end（1）And connect from Clutch, the number show that wheel disc passes through wheel disc positioning screw（33）It is fixedly connected with shaft.

4. a kind of math teaching tool for primary school according to claim 1, it is characterised in that：The described number show on the outside of wheel disc with Shell（1）Wheel disk-positioning mechanism is equipped between inner wall（23）, take turns disk-positioning mechanism（23）Including steel ball（231）, spring（232）With Positioning disk（233）, positioning disk（233）Outer end face is fixed at shell（1）On inner wall, positioning disk（233）Inner face is equipped with It is multiple to allow steel ball（231）The groove of placement；Number shows that wheel disc outer end face is equipped with and places spring（232）Slot, spring （232）Steel ball is placed between groove（231）.

5. a kind of math teaching tool for primary school according to claim 4, it is characterised in that：The positioning disk（233）On it is recessed Slot shows that the digital numerical in the outer rim of wheel disc is identical with number.

6. a kind of math teaching tool for primary school according to claim 1, it is characterised in that：The clutch includes washer （401）, clutch main body（402）, compression spring（403）, screw（404）And flat key（405）, clutch main body（402）In carrying The cylinder in hole, inner barrel suit outer end are cased with washer（401）Screw（404）, cylinder inner end is external again with interior The flat key in hole（405）, screw（404）Inner end passes through flat key（405）It is threadedly coupled number and shows wheel disc and wheel disc rotating shaft mechanism.

7. a kind of math teaching tool for primary school according to claim 1, it is characterised in that：The shell（1）It is aobvious equipped with number Show that the lower part of the side of window is equipped with the abacus bead of multiple sliding settings（14）.