CN209859411U - Random ball-taking teaching aid for probability theory teaching - Google Patents
Random ball-taking teaching aid for probability theory teaching Download PDFInfo
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- CN209859411U CN209859411U CN201920212074.XU CN201920212074U CN209859411U CN 209859411 U CN209859411 U CN 209859411U CN 201920212074 U CN201920212074 U CN 201920212074U CN 209859411 U CN209859411 U CN 209859411U
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- ball
- barrel
- cavity
- taking
- teaching aid
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Abstract
The utility model belongs to the field of teaching aids, in particular to a randomness ball-taking teaching aid for probability theory teaching, which comprises a ring cavity ball barrel and a ball-taking barrel; the ring cavity ball barrel comprises an outer ring cavity and an inner ring cavity, and three conical ball outlet holes which are uniformly distributed on the circumference are arranged between the outer ring cavity and the inner ring cavity; a conical ball placing hole is formed in the wall of the ring cavity on one side of the outer ring cavity, and a conical rubber plug is arranged on the conical ball placing hole; the bottom end of the inner ring cavity is provided with a ball outlet, the outer side of the ball outlet is provided with a ball taking barrel, the end wall of the ball taking barrel close to one end of the ball outlet is provided with an eccentric ball taking hole, and the other end of the ball taking barrel is provided with a cross beam; a plastic ball is arranged in the outer ring cavity; the end part of the containing cylinder is provided with a threaded end cover; the storage barrel comprises a storage cavity and a ball storage cavity, and the end part of the ball storage cavity is provided with an external thread; arc-shaped bulges which are uniformly distributed on the circumference and used for clamping the spherical barrel with the annular cavity are arranged on the inner wall of the containing cavity; the ball storage cavity is internally provided with 8 partition plates distributed circumferentially. The teaching aid is small in size, light in weight, capable of being used for handheld operation of students and convenient to carry.
Description
The technical field is as follows:
the utility model belongs to the teaching aid field, concretely relates to randomness ball-taking teaching aid for probability theory teaching.
Background art:
probability theory and statistics are relatively abstract disciplines, and mathematics teachers, when explaining the randomness of probability theory, usually explain the randomness or statistical theory of probability theory by throwing coins or picking balls. At present, there are also a lot of teaching aids that are used for explaining the randomness of probability theory, for example throw coin teaching aid, get ball teaching aid and similar randomness teaching aid, but these teaching aids all are the teaching aid that the mr used on the podium, and its size and specification are great, can only demonstrate theorem or the example problem of probability theory to classmates on the podium. And the probability theory demonstration teaching aids for teachers are complex in structure, inconvenient to operate, inconvenient to carry and high in manufacturing cost. In addition, the demonstration teaching aid is used on the platform to explain the probability theory, so that each student can clearly see the teaching process of the teaching aid. At present, no teaching aid for probability theory randomness ball taking is developed and designed for students. Greatly influencing the teaching quality and the learning efficiency. Therefore, it is necessary to design a student random ball-taking teaching aid with probability theory, which has simple structure, convenient operation and low cost.
The utility model has the following contents:
the utility model aims at providing a probability theory randomness that simple structure, convenient operation and low cost used gets ball teaching aid, this teaching aid size is less, and light in weight can be used to the handheld operation of student, portable, and the effect is directly perceived, and is interesting strong, can improve the teaching quality, easily promotes and uses on a large scale at school and education institution.
The utility model adopts the technical proposal that: a randomness ball-fetching teaching aid for probability theory teaching comprises a ring cavity ball barrel and a ball-fetching barrel; the annular cavity ball barrel comprises an outer annular cavity and an inner annular cavity, and three conical ball outlet holes which are uniformly distributed on the circumference are formed between the outer annular cavity and the inner annular cavity; a conical ball placing hole is formed in the wall of the ring cavity on one side of the outer ring cavity, and a conical rubber plug is arranged on the conical ball placing hole; the bottom end of the inner ring cavity is provided with a ball outlet, the outer side of the ball outlet is provided with a ball taking barrel, the end wall of the ball taking barrel close to one end of the ball outlet is provided with an eccentric ball taking hole, and the other end of the ball taking barrel is provided with a cross beam; and a plastic ball is arranged in the outer ring cavity.
Furthermore, the ball taking teaching aid also comprises a containing cylinder, and a threaded end cover is arranged at the end part of the containing cylinder; the storage barrel comprises a storage cavity and a ball storage cavity, and the end part of the ball storage cavity is provided with an external thread; the inner wall of the containing cavity is provided with arc-shaped bulges which are uniformly distributed on the circumference and used for clamping the spherical barrel with the annular cavity, and the number of the arc-shaped bulges is 5; the ball storage cavity is internally provided with 8 partition plates distributed circumferentially, and the partition plates divide the ball storage cavity into 8 fan-shaped cavities for storing plastic balls with different colors; the storage barrel is made of transparent plastic materials.
Furthermore, the diameter of the ball outlet hole of the conical ball outlet hole is 2mm-5mm larger than that of the plastic ball.
Further, the plastic balls are balls of at least 5 different colors.
Furthermore, the outer diameter of the conical rubber plug is 0.4mm-2mm larger than the inner diameter of the conical ball placing hole.
Further, the distance between the inner annular cavity and the end part of the outer annular cavity is less than 1.5 cm.
Furthermore, the aperture of the eccentric ball taking hole is larger than the diameter of the plastic ball, and the aperture of the ball outlet hole is larger than the aperture of the eccentric ball taking hole.
Furthermore, the circle center of the eccentric ball taking hole after rotation coincides with the circle center of the ball outlet hole.
Furthermore, the inner holes of the ball taking barrel and the annular cavity ball barrel are in interference fit.
Furthermore, the annular cavity ball barrel and the ball taking barrel are made of transparent plastic materials.
The utility model has the advantages that: the utility model provides a probability theory randomness that simple structure, convenient operation and low cost used teaching aid of getting balls, this teaching aid size is less, and light in weight can be used to student's handheld operation, portable, and the effect is directly perceived, and is interesting strong, reasonable in design, economy is suitable for, can improve the teaching quality, easily promotes on a large scale and uses at school and education institution.
Description of the drawings:
FIG. 1 is a schematic structural diagram of the first embodiment;
FIG. 2 is a right side view of FIG. 1;
FIG. 3 is a left side view of FIG. 1;
FIG. 4 is a schematic structural view of a ball barrel with a middle ring cavity according to an embodiment;
FIG. 5 is a right side view of FIG. 4;
FIG. 6 is a schematic structural view of a ball retrieving cylinder according to an embodiment;
FIG. 7 Right side view of FIG. 6
FIG. 8 is a schematic view of an embodiment of random ball fetching;
FIG. 9 is a schematic structural view of the second embodiment;
FIG. 10 is a schematic structural view of a storage barrel according to a second embodiment;
FIG. 11 is a left side view of FIG. 10;
fig. 12 is a right side view of fig. 10.
The specific implementation mode is as follows:
example one
Referring to fig. 1-8, a random ball-fetching teaching aid for probability theory teaching comprises a ring cavity ball barrel 1 and a ball-fetching barrel 2; the annular cavity ball barrel 1 comprises an outer annular cavity 11 and an inner annular cavity 13, and three conical ball outlet holes 12 which are uniformly distributed circumferentially are arranged between the outer annular cavity 11 and the inner annular cavity 13; a conical ball placing hole 14 is formed in the wall of the annular cavity on one side of the outer annular cavity 11, and a conical rubber plug 3 is arranged on the conical ball placing hole 14; the bottom end of the inner ring cavity 13 is provided with a ball outlet 15, the outer side of the ball outlet 15 is provided with a ball taking barrel 2, the end wall of the ball taking barrel 2 close to one end of the ball outlet 15 is provided with an eccentric ball taking hole 21, and the other end of the ball taking barrel 2 is provided with a cross beam 22; a plastic ball 4 is arranged in the outer ring cavity 11; the diameter of the ball outlet hole of the conical ball outlet hole 12 is 2mm-5mm larger than that of the plastic ball 4; the plastic balls 4 are balls with at least 5 different colors; the outer diameter of the conical rubber plug 3 is 0.4-2 mm larger than the inner diameter of the conical ball placing hole 14; the distance between the inner annular cavity 13 and the end part of the outer annular cavity 11 is less than 1.5 cm; the aperture of the eccentric ball taking hole 21 is larger than the diameter of the plastic ball 4, and the aperture of the ball outlet hole 15 is larger than the aperture of the eccentric ball taking hole 21; the center of the eccentric ball taking hole 21 after rotation is superposed with the center of the ball outlet hole 15; the inner holes of the ball taking barrel 2 and the annular cavity ball barrel 1 are in interference fit; the annular cavity ball barrel 1 and the ball taking barrel 2 are made of transparent plastic materials.
The annular cavity ball barrel can be integrally processed and manufactured through an injection mold, and is simple to manufacture and low in cost. The outer diameter of the ring cavity ball barrel is designed to be 5 cm-15 cm, the length of the ring cavity ball barrel is designed to be 5 cm-15 cm, the ring cavity ball barrel is convenient to operate by hands, and can be issued to each student in class to randomly take balls. The size of the plastic balls is designed according to the size of the ball barrel, and at least 60 plastic balls can be accommodated in the annular cavity ball barrel.
The student can demonstrate the ball-taking event by hands through the operation of the teaching aid, so that the teacher can better understand the concepts of explaining the probability theory and statistics and the difference between the concepts and the probability statistics theory such as randomness. According to the requirements of lessons, two, three, four, five or more than five plastic balls with different colors can be respectively loaded into the outer ring cavity from the tapered ball placing hole to carry out random ball taking operation. Taking the example of randomly taking out three balls with different colors, different numbers of the balls with three colors of red, yellow and blue are put into the outer ring cavity, for example, 10, 20 and 30 plastic balls with different colors are respectively put into the outer ring cavity. After the plastic ball is placed, the plastic ball is sealed by the conical rubber plug, the annular cavity ball cylinder is held by a hand to irregularly rotate and shake, and the number of rotation turns, the amplitude and the shaking amplitude are random. In the process of rotating and shaking the ball barrel, the plastic balls in the outer ring cavity randomly and sequentially enter the inner ring cavity from a certain conical ball outlet hole, after the plastic balls enter the inner ring cavity, because the outlet of the conical ball outlet hole is slightly larger than the plastic balls and the space of the inner ring cavity is larger, the probability that the plastic balls in the inner ring cavity enter the outer ring cavity from the conical ball outlet hole in the rotating and shaking processes is extremely low, even if the plastic balls enter the outer ring cavity, the random ball taking event is not influenced, and the final result is to count the number of the random balls. If want to take out six balls at random, then look over the quantity of getting the ball at random through watching interior ring chamber side, get ball quantity and reach six backs, make the eccentric ball hole of getting of ball section of thick bamboo and the play ball hole circular of interior ring chamber coincide basically through the crossbeam of rotatory ball section of thick bamboo tip of getting, this is that the cylinder body makes the plastic ball of interior ring chamber take out by above-mentioned two holes of coincidence slowly inclining and rock, accomplishes the operation of getting the ball at random, rotatory ball section of thick bamboo of getting after getting the ball staggers eccentric ball hole and play ball hole. If more balls are randomly taken out, the ball taking operation can be carried out for several times or more. After the balls are randomly taken for many times, each student can understand randomness and probability theory, the probability that teachers explain the balls with different colors can be effectively matched, so that the students can understand what the probability theory is, the number of the balls with different colors obtained after the balls are taken for many times is counted, the rough proportion of the three balls with different colors in the outer ring cavity is counted, the statistics is understood, and meanwhile, the probability and the statistical difference can be understood. The teaching aid is mainly small in size, light in weight, capable of being operated in a handheld mode to randomly take balls, suitable for being distributed to every student, capable of enabling students to randomly take balls in hands, capable of improving teaching quality and efficiency, capable of exciting interests of students in learning probability theory and statistics, low in production cost, capable of achieving large-scale production, economical in use and capable of achieving market popularization value.
Example two
Referring to fig. 9-12, on the basis of the first technical solution of the embodiment, the ball taking teaching aid further comprises a storage cylinder 5, and a threaded end cover 6 is arranged at the end of the storage cylinder 5; the containing barrel 5 comprises a containing cavity 51 and a ball storage cavity 52, and the end part of the ball storage cavity 52 is provided with an external thread 53; the inner wall of the containing cavity 51 is provided with arc-shaped bulges 54 which are uniformly distributed on the circumference and used for clamping the spherical barrel 1 with the ring cavity, and the number of the arc-shaped bulges 54 is 5; 8 partition plates 56 distributed circumferentially are arranged in the ball storage cavity 52, and the partition plates 56 divide the ball storage cavity 52 into 8 sector cavities 55 for storing plastic balls 4 with different colors; the storage barrel 5 is made of transparent plastic materials. The plastic ball of multiple different colours can be classified and accomodate to this embodiment, and the student of being convenient for carries and gets the ball of using of putting random ball. And can put into this containing cylinder with the whole teaching aid of embodiment one, portable and deposit.
Claims (10)
1. The utility model provides a randomness teaching aid of getting football for probability theory teaching which characterized in that: the ball taking teaching aid comprises an annular cavity ball barrel (1) and a ball taking barrel (2); the spherical barrel with the annular cavity (1) comprises an outer annular cavity (11) and an inner annular cavity (13), and three conical ball outlet holes (12) which are uniformly distributed on the circumference are formed between the outer annular cavity (11) and the inner annular cavity (13); a conical ball placing hole (14) is formed in the wall of the annular cavity on one side of the outer annular cavity (11), and a conical rubber plug (3) is arranged on the conical ball placing hole (14); the bottom end of the inner ring cavity (13) is provided with a ball outlet hole (15), the outer side of the ball outlet hole (15) is provided with a ball taking barrel (2), the end wall of the ball taking barrel (2) close to one end of the ball outlet hole (15) is provided with an eccentric ball taking hole (21), and the other end of the ball taking barrel (2) is provided with a cross beam (22); and a plastic ball (4) is arranged in the outer ring cavity (11).
2. A randomness ball-picking teaching aid for probability theory teaching according to claim 1, characterized in that: the ball taking teaching aid further comprises a storage barrel (5), and a threaded end cover (6) is arranged at the end part of the storage barrel (5); the receiving cylinder (5) comprises a receiving cavity (51) and a ball storage cavity (52), and an external thread (53) is arranged at the end part of the ball storage cavity (52); the inner wall of the containing cavity (51) is provided with arc-shaped bulges (54) which are uniformly distributed on the circumference and used for clamping the spherical barrel (1) with the annular cavity, and the number of the arc-shaped bulges (54) is 5; 8 partition plates (56) which are circumferentially distributed are arranged in the ball storage cavity (52), and the ball storage cavity (52) is divided into 8 fan-shaped cavities (55) for storing plastic balls (4) with different colors by the partition plates (56); the storage barrel (5) is made of transparent plastic materials.
3. A randomness ball-picking teaching aid for probability theory teaching according to claim 1 or 2, characterized in that: the diameter of the ball outlet hole of the conical ball outlet hole (12) is 2mm-5mm larger than that of the plastic ball (4).
4. A randomness ball-picking teaching aid for probability theory teaching according to claim 1 or 2, characterized in that: the plastic balls (4) are balls with at least 5 different colors.
5. A randomness ball-picking teaching aid for probability theory teaching according to claim 1 or 2, characterized in that: the outer diameter of the conical rubber plug (3) is 0.4-2 mm larger than the inner diameter of the conical ball placing hole (14).
6. A randomness ball-picking teaching aid for probability theory teaching according to claim 1 or 2, characterized in that: the distance between the inner ring cavity (13) and the end part of the outer ring cavity (11) is less than 1.5 cm.
7. A randomness ball-picking teaching aid for probability theory teaching according to claim 1 or 2, characterized in that: the aperture of the eccentric ball taking hole (21) is larger than the diameter of the plastic ball (4), and the aperture of the ball outlet hole (15) is larger than the aperture of the eccentric ball taking hole (21).
8. A randomness ball-picking teaching aid for probability theory teaching according to claim 1 or 2, characterized in that: the center of the eccentric ball taking hole (21) after rotation coincides with the center of the ball outlet hole (15).
9. A randomness ball-picking teaching aid for probability theory teaching according to claim 1 or 2, characterized in that: the inner holes of the ball taking barrel (2) and the annular cavity ball barrel (1) are in interference fit.
10. A randomness ball-picking teaching aid for probability theory teaching according to claim 1 or 2, characterized in that: the annular cavity ball barrel (1) and the ball taking barrel (2) are made of transparent plastic materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920212074.XU CN209859411U (en) | 2019-02-20 | 2019-02-20 | Random ball-taking teaching aid for probability theory teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920212074.XU CN209859411U (en) | 2019-02-20 | 2019-02-20 | Random ball-taking teaching aid for probability theory teaching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209859411U true CN209859411U (en) | 2019-12-27 |
Family
ID=68931775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920212074.XU Expired - Fee Related CN209859411U (en) | 2019-02-20 | 2019-02-20 | Random ball-taking teaching aid for probability theory teaching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209859411U (en) |
-
2019
- 2019-02-20 CN CN201920212074.XU patent/CN209859411U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191227 |