CN110060549A - Mathematical statistics is distributed demo system - Google Patents
Mathematical statistics is distributed demo system Download PDFInfo
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- CN110060549A CN110060549A CN201910171187.4A CN201910171187A CN110060549A CN 110060549 A CN110060549 A CN 110060549A CN 201910171187 A CN201910171187 A CN 201910171187A CN 110060549 A CN110060549 A CN 110060549A
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- fixedly connected
- support frame
- distributed
- shell
- spin
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/02—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for mathematics
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Abstract
The invention belongs to technical field of teaching instruments, in particular a kind of mathematical statistics is distributed demo system, including shell, the shell is internally provided with support frame, sliding slot has been fitted and connected on the outside of the sliding block and fixed block, the bottom end of the lower housings of first ball groove is fixedly connected with reaction column, the inside circumference of the reaction column offers the second ball groove, the bottom end of the lower housings of the reaction column is fixedly connected with pedestal, the inside of the pedestal, which screws, is connected with ball case, original structure is improved, pass through sliding block and sliding slot, adjust support frame height, spin is placed on different height, the motion profile that record different height situation spin is fallen, interest is strong, shell uses transparent plastics material, spin quantity can intuitively be observed；The manual switch structure of setting, the quantity and speed that controllable spin is fallen carry out single spin and fall demonstration, and ball case is put into ball case by stretching structure, by the spin taking-up in the second ball groove, simple and convenient, save space.
Description
Technical field
The invention belongs to technical field of teaching instruments, and in particular to mathematical statistics is distributed demo system.
Background technique
Mathematical statistics carries out the uncertain phenomenon influenced by enchancement factor a large amount of using probability theory as theoretical basis
Observation or test, obtain sample in an efficient way, extract information, and then draw an inference to the statistical law of chance phenomenon,
Have many characteristics, such as randomness, quantitative, bulking property, and has gradually formed parameter Estimation, hypothesis testing, multivariate statistics, large sample
Numerous branches such as statistics, nonparametric statistics, statistical decision, experimental design, linear model, quality control, robust statistics, with society
Meeting economic statistics is compared, very huge with greater need for the data volume of stringent hypothesis and strict mathematical logic inference, processing,
It runs program or algorithm is considerably complicated, with the utilization of high-speed computer and the exploitation of multiple functional statistical package, grind
Study carefully field constantly to expand, new method and new theory emerge one after another.
The Chinese patent for being 207587233 U of CN according to Authorization Notice No., a kind of mathematical statistics teaching aid special use
The difference that table tennis falls into number in each collecting chamber can demonstrate the principle of DYNAMIC DISTRIBUTION well, but during use also
It has certain problems, its structure is complicated, and it is inconvenient for use, when in use support frame cannot be adjusted according to different demonstration demands
Highly, single statistics content can only be demonstrated, interest is lacked, influences the interest of student's study, and the content demonstrated is not
It is enough intuitive specific, influence teaching efficiency；Original mathematical statistics is distributed demo system, and spin rolls into ball groove when in use
Not the occurrence of quantity not can be carried out reasonable control, often fall simultaneously with multiple spin, and finished in use
Afterwards, spin collects inconvenient, occupied space.
Summary of the invention
To solve the above-mentioned problems in the prior art, the present invention provides mathematical statisticss to be distributed demo system, tool
Have structure it is simple, it is easy to use, can highly reconcile good demonstration effect the characteristics of.
To achieve the above object, the invention provides the following technical scheme: mathematical statistics is distributed demo system, including it is outer
The upper end of shell, the shell is rotatably connected to box cover by shaft, and the upper end side of the box cover is fixedly connected with buckle, institute
The upper end face for stating box cover is rotatably connected to handle by shaft, and the shell is internally provided with support frame, support frame as described above
Upper end two sides be fixedly connected with sliding block, the bottom end two sides of support frame as described above are fixedly connected with fixed block, the sliding block and fixation
Sliding slot is fitted and connected on the outside of block, the center position of support frame as described above offers dovetail groove, the inside card of the dovetail groove
Conjunction is connected with card, and a side surface of the card is fixedly connected with knob, and the inside of the bottom end support frame of the dovetail groove is opened
Equipped with the first ball groove, the bottom end of the lower housings of first ball groove is fixedly connected with reaction column, the inside of the reaction column
Surrounding offers the second ball groove, and the bottom end of the lower housings of the reaction column is fixedly connected with pedestal, the inside rotation of the pedestal
Conjunction is connected with ball case, and the center position of the ball case is connected together and has push rod.
Demo system optimal technical scheme, the main structure of support frame as described above are distributed as mathematical statistics of the invention
For Y-shaped structure.
Demo system optimal technical scheme, the two sides inner surface of the shell are distributed as mathematical statistics of the invention
Rectangular sliding slot is offered, the inner surface of the sliding slot is fixedly connected with magnetic stripe.
Demo system optimal technical scheme, the upper end face of the reaction column are distributed as mathematical statistics of the invention
Offer round slot rolling, the slot rolling bottom end surface and the second ball groove upper end face horizontal abutment.
It is distributed demo system optimal technical scheme as mathematical statistics of the invention, the inner shell of the pedestal
Bottom end is fixedly connected with bar slot, and the inside of the bottom end pedestal of the bar slot is connected together and has rubber pad.
Demo system optimal technical scheme, the center of the rubber pad are distributed as mathematical statistics of the invention
Upper surface two sides are fixedly connected on the upper end face of bar slot by spring, and the center lower surface of the rubber pad is fixed to be connected
It is connected to push rod.
Demo system optimal technical scheme, the upper and lower ends of the fixed block are distributed as mathematical statistics of the invention
It is fixedly connected to magnetite, the fixed block is fixed by magnetite and the magnetic stripe on the inside of sliding slot.
Compared with prior art, the beneficial effects of the present invention are: being drilled by apparatus for demonstrating mathematical statistics content
Show, and improve to original apparatus for demonstrating structure mainly have three big structures inside apparatus for demonstrating, support frame, reaction column and
Ball case, structure is simple, is easily installed and dismantles, and is moved up and down in sliding slot by sliding block and fixed block, adjustment support frame and anti-
Height between Ying Zhu, spin is placed on the support frame of different height, the fortune that demonstration spin is tumbled in different height spin
Dynamic rail mark, height adjustment is portable, and interest is strong, and shell and internal structure mostly use transparent plastics material, can intuitively observe rolling
The quantity of ball falls track and falls the time；Manual switch structure is set in apparatus for demonstrating support frame center position, controllably
The quantity and speed that spin processed is fallen, and single spin can be carried out and fall demonstration, easy to use, statistical data is accurate, in pedestal
Bottom inner portion screw and be connected with ball case, by stretching structure, the spin in the second ball groove can be taken out and be put into ball case, use
Simply, storage is convenient, saves space.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the overlooking structure diagram in the present invention；
Fig. 3 is the support frame partial structural diagram in the present invention；
Fig. 4 is the reaction column structural schematic diagram in the present invention；
Fig. 5 is the schematic diagram of base structure in the present invention；
Fig. 6 is the fixed-block-architecture (FBA) schematic diagram in the present invention；
In figure: 1, shell；2, box cover；3, pedestal；4, support frame；5, handle；6, it buckles；7, dovetail groove；8, the first ball
Slot；9, sliding slot；10, sliding block；11, fixed block；12, reaction column；13, the second ball groove；14, ball case；15, knob；16, card；
17, slot rolling；18, push rod；19, rubber pad；20, bar slot；21, magnetite.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
Please refer to Fig. 1-6, the present invention the following technical schemes are provided: mathematical statistics is distributed demo system, including shell 1,
The upper end of shell 1 is rotatably connected to box cover 2 by shaft, and the upper end side of box cover 2 is fixedly connected with buckle 6, box cover 2 it is upper
End surfaces are rotatably connected to handle 5 by shaft, and shell 1 is internally provided with support frame 4, and the upper end two sides of support frame 4 are fixed
It is connected with sliding block 10, the bottom end two sides of support frame 4 are fixedly connected with fixed block 11, the outside fitting of sliding block 10 and fixed block 11
It is connected with sliding slot 9, the center position of support frame 4 offers dovetail groove 7, and the inside of dovetail groove 7, which is connected together, card 16,
One side surface of card 16 is fixedly connected with knob 15, and the inside of the bottom end support frame 4 of dovetail groove 7 offers the first ball groove 8,
The bottom end of the lower housings 1 of first ball groove 8 is fixedly connected with reaction column 12, and the inside circumference of reaction column 12 offers the second ball
Slot 13, the bottom end of the lower housings 1 of reaction column 12 are fixedly connected with pedestal 3, and the inside of pedestal 3, which screws, is connected with ball case 14, ball
The center position of box 14, which is connected together, push rod 18, and shell 1 is transparent plastics material shell 1 in the present embodiment, is merrily and lightheartedly convenient for
It carries, transparent convenient for observation, handle 5 is convenient for lifting shell 1, and engaging is placed in the slot that 2 surface of box cover opens up when not used, saves
Save space, sliding block 10 are metal material, and surface is smooth, and force of sliding friction is small between sliding slot 9, and dovetail groove 7 is convenient for spin entrance
In first ball groove 8, card 16 is semi-circular shape, is fixedly connected with knob 15, for opening and closing size at 8 goal of the first ball groove
The pedestal 3 of control, plastic material is connect with the ball case 14 of plastic material by screwing, and is easy to use.
Specifically, the main structure of support frame 4 is Y-shaped structure, support frame 4 is Y-shaped structure in the present embodiment, upper end by
On tilt down certain angle, reduce the frictional force of spin and 4 inner wall of support frame, tumbled downwards convenient for spin, support frame 4 four
All outsides are fixed with the plastic housing of transparent material, are used to support frame 4 and support and fix in the inside of shell 1, transparent plastics material
Shell 1 convenient for observation spin motion conditions.
Specifically, the two sides inner surface of shell 1 offers rectangular sliding slot 9, the inner surface of sliding slot 9 is fixedly connected with magnetic
Item, the side of sliding slot 9 is fixed on 1 inner surface of shell in the present embodiment, and upper and lower ends engaging has sliding block 10 and fixed block 11,
The bottom inner surface of sliding slot 9 is fixedly connected with magnetic stripe, magnetic stripe and the fixed block 11 for having magnetite 21, is used for sliding slot 9 and support frame
4 absorption is fixed, the adjustment of 4 height of frame easy to support.
Specifically, the upper end face of reaction column 12 offers round slot rolling 17,17 bottom end surface of slot rolling and the second ball groove 13
Upper end face horizontal abutment, the round slot rolling 17 that 12 upper end face of reaction column opens up in the present embodiment is for accessing mobile rolling
Ball makes spin turn in slot rolling 17, facilitates access for the inside of the second ball groove 13.
Specifically, the bottom end of the inner shell 1 of pedestal 3 is fixedly connected with bar slot 20, the bottom end pedestal 3 of bar slot 20 it is interior
Portion, which is connected together, rubber pad 19, and the hollow stem slot 20 of plastic material is fixed on the bottom end of shell 1, bar slot 20 in the present embodiment
Bottom end engaging has rubber pad 19, and when pushing up push rod 18, the center of rubber pad 19 is to 20 sunken inside of bar slot, rubber pad
19 surrounding is bent downwardly.
Specifically, the center upper surface two sides of rubber pad 19 are fixedly connected on the upper end table of bar slot 20 by spring
Face, the center lower surface of rubber pad 19 are fixedly connected with push rod 18, and the push rod 18 of aluminium material is fastened on bottom in the present embodiment
The center position of seat 3 and ball case 14, by pushing up one end of push rod 18, the upper end of push rod 18 is upward, by rubber
It pads in 19 ramming stem slots 20, to realize the folding of the second ball groove 13, is restored by the elasticity of rubber pad 19 and spring, automatically
Return original state.
Specifically, the upper and lower ends of fixed block 11 are fixedly connected to magnetite 21, fixed block 11 passes through magnetite 21 and sliding slot
9 inside magnetic stripe be fixed, in the present embodiment the magnetite 21 of 11 upper and lower ends of fixed block by with the magnetic stripe inside sliding slot 9
It is fixed, is used to support the fixation of frame 4 Yu sliding slot 9, the adjustment of height between frame 4 and reaction column 12 easy to support.
The working principle of the invention and process for using: in the use of the present invention, the handle 5 of 1 upper end of shell is carried, it will be outer
Shell 1 is placed on smooth mounting table, is opened the buckle 6 of 1 upper end side of shell, is raised box cover 2, push down on support frame 4, is propped up
The sliding block 10 and fixed block 11 of 4 upper and lower ends of support adjust the height of support frame 4 Yu reaction column 12 in 9 slide downward of sliding slot
Afterwards, it is fixed by the magnetite 21 inside fixed block 11 with the magnetic stripe in sliding slot 9, screws off ball case 14 from the bottom end of pedestal 3,
Suitable spin is taken out from ball case 14, pour into part or spin is individually placed in the inside of support frame 4, records spin number
Amount, can be counted automatically by existing infrared induction counter, pulled out card 16 by rotating knob 15, supported
Spin inside frame 4 vertically falls the surface in reaction column 12 by dovetail groove 7 and the first ball groove 8, and spin is by elastic force anti-
It answers 12 surface of column to bounce, when elastic force weakens, rolls into what 12 surrounded surface of reaction column opened up from the arcwall face of the upper end of reaction column 12
It in slot rolling 17, finally rolls into inside the second ball groove of cylindricality 13 that 12 surrounding of reaction column opens up, by observing each second ball groove 13
The quantity of internal ball records data, and after use, the 1 remaining spin in inside of shell is placed in ball case 14, will
Ball case 14 is screwed with pedestal 3 and is connect, and touches push rod 18 upwards, and the center position that push rod 18 pushes up rubber pad 19 enters
The surrounded surface of bar slot 20, rubber pad 19 is bent downwardly, and 13 bottom of the second ball groove of closure is opened originally, in the second ball groove 13
The spin in portion is fallen in ball case 14, is collected storage and is got up.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not limited to this hair
It is bright, although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, according to
It is so possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is equal
Replacement.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection scope of invention.
Claims (7)
1. mathematical statistics is distributed demo system, it is characterised in that: including shell (1), the upper end of the shell (1) passes through shaft
It is rotatably connected to box cover (2), the upper end side of the box cover (2) is fixedly connected with buckle (6), the upper end table of the box cover (2)
Face is rotatably connected to handle (5) by shaft, and the shell (1) is internally provided with support frame (4), support frame as described above (4)
Upper end two sides are fixedly connected with sliding block (10), and the bottom end two sides of support frame as described above (4) are fixedly connected with fixed block (11), the cunning
It has been fitted and connected sliding slot (9) on the outside of block (10) and fixed block (11), the center position of support frame as described above (4) offers trapezoidal
Slot (7), the inside of the dovetail groove (7) are connected together and have card (16), and a side surface of the card (16) is fixedly connected with
The inside of knob (15), the bottom end support frame (4) of the dovetail groove (7) offers the first ball groove (8), first ball groove (8)
The bottom ends of lower housings (1) be fixedly connected with reaction column (12), the inside circumference of the reaction column (12) offers the second ball
The bottom end of slot (13), the lower housings (1) of the reaction column (12) is fixedly connected with pedestal (3), the inside rotation of the pedestal (3)
Conjunction is connected with ball case (14), and the center position of the ball case (14) is connected together and has push rod (18).
2. mathematical statistics according to claim 1 is distributed demo system, it is characterised in that: the master of support frame as described above (4)
Body structure is Y-shaped structure.
3. mathematical statistics according to claim 1 is distributed demo system, it is characterised in that: the two sides of the shell (1)
Inner surface offers rectangular sliding slot (9), and the inner surface of the sliding slot (9) is fixedly connected with magnetic stripe.
4. mathematical statistics according to claim 1 is distributed demo system, it is characterised in that: the reaction column (12) it is upper
End surfaces offer round slot rolling (17), slot rolling (17) bottom end surface and the second ball groove (13) upper end face horizontal abutment.
5. mathematical statistics according to claim 1 is distributed demo system, it is characterised in that: the inside of the pedestal (3)
The bottom end of shell (1) is fixedly connected with bar slot (20), and the inside of the bottom end pedestal (3) of the bar slot (20) is connected together and has rubber
It pads (19).
6. mathematical statistics according to claim 5 is distributed demo system, it is characterised in that: in the rubber pad (19)
Heart position upper surface two sides are fixedly connected on the upper end face of bar slot (20), the center of the rubber pad (19) by spring
Lower surface is fixedly connected with push rod (18).
7. mathematical statistics according to claim 1 is distributed demo system, it is characterised in that: the fixed block (11) it is upper
Lower both ends are fixedly connected to magnetite (21), and the fixed block (11) is attracted by the magnetic stripe on the inside of magnetite (21) and sliding slot (9)
It is fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910171187.4A CN110060549B (en) | 2019-03-07 | 2019-03-07 | Mathematical statistics distribution demonstration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910171187.4A CN110060549B (en) | 2019-03-07 | 2019-03-07 | Mathematical statistics distribution demonstration system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110060549A true CN110060549A (en) | 2019-07-26 |
| CN110060549B CN110060549B (en) | 2021-03-09 |
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ID=67316076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910171187.4A Active CN110060549B (en) | 2019-03-07 | 2019-03-07 | Mathematical statistics distribution demonstration system |
Country Status (1)
| Country | Link |
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| CN (1) | CN110060549B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112509434A (en) * | 2020-12-28 | 2021-03-16 | 石家庄信息工程职业学院 | Interactive installation is used in english teaching |
| CN113870666A (en) * | 2021-11-09 | 2021-12-31 | 甘肃民族师范学院 | Probability calculation demonstration equipment for mathematical education |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000194257A (en) * | 1998-12-28 | 2000-07-14 | Tokai Univ | Probability statistic distribution display unit |
| CN101630459A (en) * | 2009-08-19 | 2010-01-20 | 西安电子科技大学 | Coupled normal distribution probability demonstration instrument |
| CN205692440U (en) * | 2016-03-25 | 2016-11-16 | 王兵兵 | A kind of mathematical education demonstration device for probability |
| CN206558068U (en) * | 2017-02-19 | 2017-10-13 | 麻阳苗族自治县第一中学 | Stochastic variable normal distribution density experimental demonstration device |
| CN206619315U (en) * | 2017-01-20 | 2017-11-07 | 黑龙江工程学院 | Mathematical statistics distribution demonstration device |
| CN206649768U (en) * | 2017-04-11 | 2017-11-17 | 张馨之 | Stochastic finite element demonstration teaching aid |
| CN108364543A (en) * | 2018-03-09 | 2018-08-03 | 河南理工大学 | A kind of Mathematical Probability Teaching simulator apparatus |
-
2019
- 2019-03-07 CN CN201910171187.4A patent/CN110060549B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000194257A (en) * | 1998-12-28 | 2000-07-14 | Tokai Univ | Probability statistic distribution display unit |
| CN101630459A (en) * | 2009-08-19 | 2010-01-20 | 西安电子科技大学 | Coupled normal distribution probability demonstration instrument |
| CN205692440U (en) * | 2016-03-25 | 2016-11-16 | 王兵兵 | A kind of mathematical education demonstration device for probability |
| CN206619315U (en) * | 2017-01-20 | 2017-11-07 | 黑龙江工程学院 | Mathematical statistics distribution demonstration device |
| CN206558068U (en) * | 2017-02-19 | 2017-10-13 | 麻阳苗族自治县第一中学 | Stochastic variable normal distribution density experimental demonstration device |
| CN206649768U (en) * | 2017-04-11 | 2017-11-17 | 张馨之 | Stochastic finite element demonstration teaching aid |
| CN108364543A (en) * | 2018-03-09 | 2018-08-03 | 河南理工大学 | A kind of Mathematical Probability Teaching simulator apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112509434A (en) * | 2020-12-28 | 2021-03-16 | 石家庄信息工程职业学院 | Interactive installation is used in english teaching |
| CN113870666A (en) * | 2021-11-09 | 2021-12-31 | 甘肃民族师范学院 | Probability calculation demonstration equipment for mathematical education |
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| Publication number | Publication date |
|---|---|
| CN110060549B (en) | 2021-03-09 |
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