CN112562428B - Mathematics subject probability course teaching is with experimental auxiliary device at random - Google Patents
Mathematics subject probability course teaching is with experimental auxiliary device at random Download PDFInfo
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- CN112562428B CN112562428B CN202011611662.4A CN202011611662A CN112562428B CN 112562428 B CN112562428 B CN 112562428B CN 202011611662 A CN202011611662 A CN 202011611662A CN 112562428 B CN112562428 B CN 112562428B
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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
- G09B5/00—Electrically-operated educational appliances
- G09B5/02—Electrically-operated educational appliances with visual presentation of the material to be studied, e.g. using film strip
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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
Abstract
The invention discloses a random test auxiliary device for mathematical probability course teaching, which comprises a base, a turntable, a cover body, a motor and a controller, wherein the turntable is arranged on the base; the base plays a role in integral support; the rotary disc moves a demonstration object (such as dice) to simulate throwing action; the cover body limits the demonstration objects (such as dice) to move within a certain range; the motor drives the turntable to rotate; the controller controls the motor to start and stop. The random test auxiliary device for the mathematics probability course teaching can electrically control the activities of demo objects (such as dice), can effectively perform random test demonstration, and embodies the advantage of high automation degree.
Description
Technical Field
The embodiment of the invention relates to teaching experimental equipment, in particular to a random test auxiliary device for mathematical probability course teaching.
Background
Probability is a mathematical branch for studying the quantitative law of random phenomena. The random phenomenon refers to that under the condition that basic conditions are not changed, which result can not be ensured to occur before each test or observation, and the random phenomenon shows an accidental phenomenon. The realization of a stochastic phenomenon and its observation is called a stochastic experiment, each possible outcome of a stochastic experiment is called a fundamental event, and one or a group of fundamental events are collectively called stochastic events (abbreviated as events). The probability of an event is a measure of the likelihood of the event occurring, and although an event occurs with chance in a random trial, random trials that can be repeated in large numbers under the same conditions tend to exhibit a significant number of rules.
In the course of probability course teaching of the mathematics subjects in schools, in order to improve the interest of the classroom and deepen the understanding of the students on the knowledge, the teachers may perform some random experimental demonstrations. At present, random test demonstrations are performed manually, for example, to perform 20 dice rolling experiments, a teacher needs to perform 20 tossing actions, which is time-consuming and labor-consuming, reduces teaching efficiency, and is prone to have demonstration accidents (for example, dice rolling too far is not found).
Therefore, if a device for automatically realizing dice throwing is provided, the workload of teachers can be greatly reduced, and the teaching efficiency is improved.
Disclosure of Invention
The invention aims to provide a random test auxiliary device for mathematical science probability course teaching, which has high automation degree and aims to overcome the defects in the prior art.
In order to realize the purpose of the invention, the invention adopts the following technical scheme: a mathematics probability course teaching is with experimental auxiliary device at random, includes: the motor comprises a base, a rotary table, a cover body, a motor and a controller, wherein the base is provided with a first through hole and a circle of first groove, the first through hole and the first groove are both circular, the circle center of the first through hole is coincided with the circle center of the first groove, and the first groove extends in the vertical direction; the turntable is movably connected with the base and inserted into the first through hole, and the first through hole is the rotating center of the turntable; the cover body is cylindrical and hollow, and the lower end of the cover body is detachably inserted into the first groove; the motor is arranged below the base, is matched and connected with the turntable and is used for driving the turntable to rotate; the controller is electrically connected with the motor and used for controlling the motor to start and stop.
In addition, the invention also provides the following auxiliary technical scheme:
the first groove is provided with two side walls and a bottom, a plurality of second grooves extending in the horizontal direction are arranged on one side wall, the adjacent intervals of the plurality of second grooves are equal, an elastic pressing assembly is arranged in each second groove, and the elastic pressing assembly applies pressure in the horizontal direction to the cover body.
The elastic pressing assembly comprises a shell, a marble and at least two elastic sheets; the shell comprises a shell barrel, a shell bottom and a shell cover, wherein the shell bottom is arranged at one end of the shell barrel and is vertical to the shell barrel, the shell cover is arranged at the other end of the shell barrel and is vertical to the shell barrel, the shell barrel is cylindrical and is hollow, the shell bottom is circular, the shell cover is circular and is provided with a second through hole, the second through hole is circular, the circle center of the second through hole is coincided with the circle center of the shell cover, and the radius of the second through hole is smaller than the spherical radius of a marble; the at least two spring plates are symmetrically arranged in the shell cylinder; the marble is arranged between the shell cover and the at least two elastic sheets.
The two elastic pieces comprise connecting pieces and elastic pieces, the connecting pieces are fixedly connected with the edges of the shell cover, the upper ends of the elastic pieces are fixedly connected with the connecting pieces, the connecting angles are obtuse angles, and the lower ends point to the circle center position of the shell bottom.
The elastic sheet is provided with a third groove along the length direction, and the groove surface of the third groove is arc-shaped.
Still be provided with a plurality of third through-holes on the base, these a plurality of third through-holes are located first recess with between the first through-hole to these a plurality of third through-holes are circular arranging, and adjacent interval equals, all are provided with the ball in every third through-hole, carousel and ball contact each other.
The turntable comprises an upper disc and a lower disc; the upper disc comprises a circular disc surface and a circular connecting column, a circle of circular upper guide rail groove is arranged below the disc surface and is in mutual contact with the balls, the connecting column is positioned at the center position below the disc surface, and an external thread is arranged on the outer wall of the connecting column; a circle of round lower guide rail groove and a round connecting hole are arranged above the lower disc, the lower guide rail groove is in mutual contact with the ball, the connecting hole is a blind hole, and the inner wall of the connecting hole is provided with internal threads; the connecting column is in threaded connection with the connecting hole.
The connecting column is provided with a spring hole which extends axially, a spring is arranged in the spring hole, and two ends of the spring are respectively contacted with the bottom of the spring hole and the bottom of the connecting hole.
A plurality of supporting legs and a supporting platform are arranged below the base, the supporting platform is respectively connected with the supporting legs, and the motor is installed on the supporting platform.
The controller comprises a miniature camera, a singlechip and a display; the miniature camera is arranged at the upper end of the cover body and is opposite to the turntable, and the signal output end of the miniature camera is coupled with the signal input end of the singlechip; the control end of the singlechip is coupled with the motor and outputs a PWM signal to control the motor to start and stop, and the output end of the singlechip is coupled with the display and outputs an image signal to the display; the display is used for displaying images.
Compared with the prior art, the invention discloses a random test auxiliary device for mathematical probability course teaching, which comprises a base, a turntable, a cover body, a motor and a controller, wherein the turntable is arranged on the base; the base can play a role in integral support, and the cover body can be used for limiting the demonstrator (such as dice) to move within a certain range; the wheel may be used to move a demo (such as a die) to simulate a throwing action; a motor and controller may be used to control the rotation of the turntable. The random test auxiliary device for the mathematics probability course teaching can electrically control the activities of demo objects (such as dice), can effectively perform random test demonstration, and embodies the advantage of high automation degree.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments or the related art will be briefly introduced below, and it is obvious that the drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.
Fig. 1 is a perspective view of a random trial support device for mathematical science probability course teaching.
Fig. 2 is an exploded view of a stochastic test assistance device for mathematical science probability course teaching from an oblique top view.
Fig. 3 is an exploded view of the stochastic test assisting device for mathematical science probability course teaching at an oblique elevation view angle.
Fig. 4 is a perspective view of the base.
Fig. 5 is a schematic top view of the base.
Fig. 6 is an enlarged schematic view of circle a in fig. 5.
Fig. 7 is an enlarged schematic view of circle B in fig. 5.
Fig. 8 is a cross-sectional view of the resilient compression assembly.
Fig. 9 is a perspective view of the resilient compression assembly.
Fig. 10 is a cross-sectional view of the housing of the spring compression assembly.
Fig. 11 is a perspective view of the housing of the spring compression assembly.
Fig. 12 is a perspective view of the spring plate of the resilient compression assembly.
Fig. 13 is a perspective view of the upper plate of the turntable.
Fig. 14 is a perspective view of the lower plate of the turntable.
Fig. 15 is a schematic cross-sectional view of the turntable and base after assembly.
Fig. 16 is a schematic circuit connection diagram of the controller.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, there will now be described in detail, with reference to the accompanying drawings, a non-limiting detailed description of the present invention.
The mathematical summary demonstration apparatus of the present embodiment mainly performs random tests on dice.
See fig. 1-3. The teaching of mathematics branch of academic or vocational study probability course is with random experimental auxiliary device includes: base 1, carousel 2, the cover body 3, motor 4 and controller, base 1 is used for playing whole supporting role, and carousel 2 is used for getting up the dice activity, simulates out the action of artifical throwing, and the cover body 3 is used for restricting the dice activity in the certain limit, and controller control motor 4 makes its drive carousel 2 rotatory. In a whole, the random test auxiliary device for mathematics probability course teaching of the embodiment can electrically control the dice to move without manual throwing.
Referring to fig. 4, the base 1 may be made of rigid plastic, and has a circular shape with a radius of 20-25 cm and a thickness of 3-4 cm. A circle of first grooves 10 are formed in the base 1; the first groove 10 is circular, the circle center of the first groove coincides with the circle center of the base 1, and the outer circle radius of the first groove is slightly smaller than (2-4 cm) the circle radius of the base 1; the first groove 10 extends vertically from the upper plane to the lower plane of the base 1, the groove depth ranges from 2 cm to 3 cm, and the groove width ranges from 1 cm to 2 cm. The base 1 is also provided with a first through hole 11; the first through hole 11 is circular, the circle center of the first through hole coincides with the circle center of the base 1, and the radius range of the first through hole is 5-8 cm. The first groove 10 is used for inserting the lower end of the cover body 3, and the first through hole 11 is used for partially penetrating the rotating disc 2. The cover body 3 can be made by transparent rigid plastic, and it is whole cylindrical to inside cavity, the lower extreme opening, 3 inner spaces of the cover body are the home range of dice, can effectively avoid appearing the accident through the home range of injecing the dice, for example, when artifical throwing, because the operation is improper, probably can cause the dice to roll too far.
With reference again to fig. 5 and 6. The first groove 10 has two side walls, both perpendicular to the bottom, and a bottom, parallel to the lower plane of the base. Four second grooves 12 (for the simplicity of composition, only two are shown in fig. 5) are arranged on the side wall close to one side of the outer edge of the base 1, the four second grooves 12 are all round blind holes and are arranged horizontally, the horizontal central axes are all intersected with the vertical central axis of the base, and the adjacent intervals are equal. Referring to fig. 7 again, each second groove 10 is provided with an elastic pressing component, and when the cover 3 is inserted into the first groove 10, the elastic pressing component contacts the cover 3 and provides a radial pressure to the cover, so that the cover 3 is more stable in the first groove 10.
With reference again to fig. 8-11. The elastic pressing assembly comprises a shell 13, a marble 14 and two elastic sheets 15, wherein the shell 13 comprises a shell barrel 13a, a shell bottom 13b and a shell cover 13 c. The shell barrel 13a is cylindrical and hollow; the shell bottom 13b is circular and is arranged at one end of the shell barrel 13a and is vertical to the shell barrel 13 a; the case cover 13c is circular, is disposed at the other end of the case 13a, and is perpendicular to the case 13 a. A second through hole 13d is formed in the center of the housing cover 13c, and the second through hole 13d is circular and has a center coinciding with the center of the housing cover 13 c. The two spring pieces 15 have the same structural specification, and are symmetrically arranged in the shell barrel 13a by taking the diameter line of the shell cover 13c as a symmetry line. The balls 14 are movably disposed in the casing 13a, specifically between the casing cover 13c and the two spring pieces. The marble 14 is spherical, and the radius of the second through hole 13d is smaller than the spherical radius of the marble 14, and the marble can be specifically set as follows: the second through hole 13d has a radius length equal to two thirds of the spherical radius length of the marble 14, so that a part of the marble 14 can protrude out of the housing 13 through the second through hole 13 d.
With reference again to fig. 12. The elastic sheet 15 comprises a connecting sheet 15a and an elastic sheet 15b, the connecting sheet 15a and the elastic sheet 15b are fixedly connected or integrally formed, and the included angle between the connecting sheet 15a and the elastic sheet 15b is an obtuse angle. The connecting piece 15a is a flat metal piece and is fixedly connected with the lower plane of the case cover 13 c. When the connecting piece 15a is connected to the case cover 13c or the case barrel 13a, the lower end of the elastic piece 15b is directed to the center of the case bottom 13b, and the elastic piece 15b is in contact with the marble 14. The elastic sheet 15b is a special-shaped metal sheet, a third groove 15c is formed in the lower half section of the elastic sheet along the length direction of the elastic sheet, the groove surface of the third groove 15c is arc-shaped (is sunken from top to bottom), the width of the third groove accounts for two thirds of the total width of the elastic sheet 15b, and the third groove 15c is attached to the outer wall of the marble 14.
The two elastic sheets provide a pressure to the marble 14 towards the cover 13c to urge the marble 14 to move towards the second through hole 13d, and when the cover 3 is inserted into the first groove 10, the marble 14 provides a radial pressure to the cover 3, so that the cover 3 is more stable in the first groove 10. The two elastic sheets are designed to provide elastic force, so that the stability of the marble 14 can be improved, and the service life of the marble is longer than that of a spring. The design increase of third recess 15c and marble 14's area of contact is favorable to transversely spacing marble 14, further improves marble 14's stability, also improves elasticity utilization ratio simultaneously.
See also fig. 2-4. The base 1 is further provided with four third through holes 16, and the four third through holes 16 are located between the first groove 10 and the first through hole 11 and can be properly close to the first through hole 11. The four third through holes 16 are arranged in a circle, that is, the centers of the four through holes are located on a circle, and the center of the circle coincides with the center of the base 1. The four third through holes 16 are adjacent to each other at equal intervals. The four third through holes 16 are all provided with a ball 17, the ball 17 can roll in the third through hole 16, and the upper end and the lower end of the ball 17 are all protruded out of the third through hole 16. The balls 17 can contact with the rotating disk 2 to reduce the friction force of the rotating disk 2 during rotation.
The turntable 2 comprises an upper disc 20 and a lower disc 21. Referring to fig. 13, the upper plate 20 includes a plate surface 200 and a connection column 201, the plate surface 200 is circular, has a radius equal to the radius of the inner circle of the first groove 10 and has a certain thickness ranging from 1 cm to 2 cm, and the dice is placed on the plate surface 200. A circle of circular upper guide rail groove 203 is arranged below the disk surface 200, the circle center of the upper guide rail groove 203 is coincident with the circle center of the base 1, the cross section of the upper guide rail groove is arc-shaped, and the upper guide rail groove 203 can be contacted with the four balls 17. The connecting column 201 is positioned at the center of the lower part of the disk surface 200, is cylindrical, has a radius which is 0.5-1 cm smaller than that of the first through hole 11, and has a height which is 4-5 cm larger than the thickness of the chassis 1. The outer wall of the connecting column 201 is provided with an external thread. Referring to fig. 14, the lower plate 21 is cylindrical, has a radius larger than that of the upper rail groove 203 and smaller than or equal to that of the upper plate 20, and has a height ranging from 4 cm to 5 cm. A circle of round lower guide rail groove 210 and a round connecting hole 211 are arranged above the lower disc 21; the circle center of the lower guide rail groove 210 coincides with the circle center of the base 1, the cross section of the lower guide rail groove is arc-shaped, and the lower guide rail groove 210 can be in contact with four balls 17; the connecting hole 211 is located at the center of the lower disc 21 and is a circular blind hole, the inner wall of the connecting hole is provided with internal threads, and the connecting hole 211 can be in threaded connection with the connecting column 201.
When the mounting device is mounted, the lower disc 21 is firstly placed below the base 1, the connecting holes 211 are aligned with the first through holes 11, then a ball 17 is placed in each third through hole 16, then the disc surface 200 is positioned above the base 1, the upper disc 20 is placed in a posture that the connecting column 201 penetrates through the first through holes 11, and then the connecting holes 211 are in threaded connection with the connecting column 201. The design mode of carousel and base is convenient for install and dismantle, can improve the rotation smoothness degree of carousel simultaneously to a great extent. In order to improve the connection stability of the upper disc 20 and the lower disc 21, a spring hole 204 is formed in the center of the connecting column 201 along the axial direction, the spring hole 204 is a circular blind hole, a spring 206 is installed in the spring hole 204, and two ends of the spring 206 are respectively contacted with the bottom of the spring hole 204 and the bottom of the connecting hole 211 and have certain deformation. The spring 206 releases the elastic force to improve the thread engagement force of the connection hole 211 and the connection column 201, so that the connection stability of the upper plate 20 and the lower plate 21 is increased. The installation is completed schematically as shown in fig. 15.
See also fig. 4 and 15. Base 1 below is provided with three supporting legss 18 and a supporting bench 19, and three spinal branch vaulting poles 18 are connected with base 1 is perpendicular to be equilateral triangle and arrange, and three spinal branch vaulting poles 18 are with base 1's high lifting, and supporting bench 19 is the flat platform, is connected with three supporting legss 18, and motor 4 installs on supporting bench 19. The rotating rod of the motor 4 is connected with the lower disc 21, the upper disc 20 is driven by driving the lower disc 21, and the dice on the disc surface 200 of the upper disc 20 starts to move.
Referring to fig. 16, the controller comprises a micro camera, a single chip microcomputer and a display, wherein the micro camera is used for shooting the graphic information of the upward side of the dice, the single chip microcomputer is used for receiving the graphic information, processing the graphic information, identifying the number of points of the upward side of the dice, conducting accumulation recording, outputting the recorded data to the display, the single chip microcomputer is also used for controlling the operation of the motor 4, and the display is used for displaying the times that the 1-6 points of the dice respectively face upward.
During installation, the micro camera is arranged at the upper end of the cover body 3 and is opposite to the position of the turntable 2, so that a panorama (not shown) in the range of the turntable 2 can be obtained. The micro camera adopts OV2640 type camera, OV2640 is a CMOS image sensor with 2M pixels (200W), and DCMI and SCCB interfaces are used for completing data transmission and configuration control of the sensor. The signal output end (Y0-Y7 pin) of the micro camera is coupled with the signal input end of the single chip microcomputer. The single chip microcomputer adopts an STM32F407VGT6 type single chip microcomputer, is coupled with the miniature camera through a DCMI digital camera interface of the single chip microcomputer, receives image information, and calculates the number of circles (namely the number of points of a dice) in an image by executing an image recognition algorithm. The output end (P0.0-P0.7) of the single chip microcomputer is coupled with the display after passing through the exclusion RP1, and outputs the calculated dice points to the display, and the display is an LCD display screen and is used for displaying the dice points.
The image recognition algorithm comprises the following steps: reading picture information, performing gray level conversion on the picture, and performing self-adaptive threshold value binarization to highlight the outline of the dice; checking a binarization result, searching the outline, and intercepting each dice ROI; and step three, detecting the circle in the ROI by using a spot detection method, calculating the number of points and outputting the points. In order to improve the image recognition accuracy, in this embodiment, the dice is a cube, the color of the body of the dice is white (RGB (255, 255)), and the dots on the six faces of the dice are black (RGB (0,0, 0)). The disk surface of the upper disk 20 is white in color (RGB (255, 255)).
The control end (P0.9) of the single chip microcomputer is coupled with a motor (model 24BYJ48) after sequentially passing through a buffer (model 7407), a photoelectric coupler (model 6N137) and a diode (model 8050). The single chip microcomputer outputs a PWM control signal, the PWM control signal is amplified by the buffer and then is sent to the photoelectric coupler to control the start and stop of a light receiver of the photoelectric coupler, the on and off of the diode are further controlled, and finally the start and stop of the motor are controlled. The duty cycle of the PWM is 25%, i.e., the high level time is 4 seconds and the low level time is 12 seconds. The 1 st to 8 th seconds in the low level state are the time for waiting for the dice to be stopped stably, the 8 th to 12 th seconds in the low level state are the time for obtaining the result, the single chip microcomputer controls the miniature camera to start, the dice image is shot, and then the single chip microcomputer executes the image recognition algorithm to calculate the number of the dice points and displays the dice points through the display.
The teaching probability demonstration device of this embodiment passes through motor 4 drive carousel 2 for the dice activity on the carousel 2 simulates out the action of artifical throwing, and the work manual operation of throwing the dice changes for automatically controlled operation, has liberated both hands and has also improved efficiency. In addition, the starting and stopping of the motor 4 can be controlled in a timing mode through the controller, dice points can be identified and displayed, and overall intelligence is improved.
It should be noted that the above-mentioned preferred embodiments are merely illustrative of the technical concepts and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (8)
1. The utility model provides a teaching of mathematics subject probability course is with experimental auxiliary device at random which characterized in that, it includes: a base, a turntable, a cover body, a motor and a controller, wherein,
the base is provided with a first through hole and a circle of first grooves, the first through hole and the first grooves are circular, the circle center of the first through hole coincides with the circle center of the first grooves, the first grooves extend in the vertical direction, the base is further provided with a plurality of third through holes, the third through holes are located between the first grooves and the first through holes and are circularly arranged, adjacent intervals are equal, a ball is arranged in each third through hole, and the rotary table is in contact with the balls;
the turntable is movably connected with the base and inserted into a first through hole, the first through hole is the rotating center of the turntable, and the turntable comprises an upper disc and a lower disc; the upper disc comprises a circular disc surface and a circular connecting column, a circle of circular upper guide rail groove is arranged below the disc surface and is in mutual contact with the balls, the connecting column is positioned at the center position below the disc surface, and an external thread is arranged on the outer wall of the connecting column; a circle of round lower guide rail groove and a round connecting hole are arranged above the lower disc, the lower guide rail groove is in mutual contact with the ball, the connecting hole is a blind hole, and the inner wall of the connecting hole is provided with internal threads; the connecting column is in threaded connection with the connecting hole;
the cover body is cylindrical and hollow, and the lower end of the cover body is detachably inserted into the first groove;
the motor is arranged below the base, is matched and connected with the turntable and is used for driving the turntable to rotate;
the controller is electrically connected with the motor and used for controlling the motor to start and stop.
2. The random trial assistive device for probability lesson teaching of mathematics as claimed in claim 1, wherein the first groove has two side walls and a bottom, wherein one of the side walls is provided with a plurality of second grooves extending in the horizontal direction, the plurality of second grooves are arranged at equal intervals, and each second groove is provided with an elastic pressing component which applies pressure in the horizontal direction to the cover body.
3. The random trial assisting apparatus for probability course teaching in mathematics as claimed in claim 2, wherein the elastic pressing member comprises a housing, a ball and at least two elastic pieces; the shell comprises a shell barrel, a shell bottom and a shell cover, wherein the shell bottom is arranged at one end of the shell barrel and is vertical to the shell barrel, the shell cover is arranged at the other end of the shell barrel and is vertical to the shell barrel, the shell barrel is cylindrical and is hollow, the shell bottom is circular, the shell cover is circular and is provided with a second through hole, the second through hole is circular, the circle center of the second through hole is coincided with the circle center of the shell cover, and the radius of the second through hole is smaller than the spherical radius of a marble; the at least two spring plates are symmetrically arranged in the shell cylinder; the marble is arranged between the shell cover and the at least two elastic sheets.
4. The random test auxiliary device for probability course teaching of mathematics as claimed in claim 3, wherein the two spring plates each comprise a connecting piece and an elastic piece, the connecting pieces are fixedly connected with the edge of the shell cover, the upper ends of the elastic pieces are fixedly connected with the connecting pieces, the connecting angle is an obtuse angle, and the lower ends point to the circle center position of the shell bottom.
5. The random trial assisting apparatus for probability lesson teaching in mathematics as claimed in claim 4, wherein said elastic piece is provided with a third groove along a length direction thereof, and a groove surface of said third groove is arc-shaped.
6. The random trial assisting apparatus for probability course teaching in mathematics as claimed in claim 1, wherein said connecting column is provided with an axially extending spring hole, a spring is installed in the spring hole, and both ends of the spring are respectively in contact with the bottom of the spring hole and the bottom of the connecting hole.
7. The random test auxiliary device for probability course teaching of mathematics as claimed in claim 1, wherein a plurality of supporting legs and a supporting platform are provided under the base, the supporting platform is connected with the plurality of supporting legs, respectively, and the motor is mounted on the supporting platform.
8. The stochastic experiment assisting apparatus for mathematical science probability course teaching according to claim 1, wherein the controller comprises a micro camera, a single chip microcomputer and a display; the miniature camera is arranged at the upper end of the cover body and is opposite to the turntable, and the signal output end of the miniature camera is coupled with the signal input end of the singlechip; the control end of the singlechip is coupled with the motor and outputs a PWM signal to control the motor to start and stop, and the output end of the singlechip is coupled with the display and outputs an image signal to the display; the display is used for displaying images.
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