A probability demonstration device for mathematics

Abstract

The utility model provides a mathematical probability demonstration device, which relates to the technical field of teaching tools. The mathematical probability demonstration device comprises a shell, a collision part, a fixing rod, a vertical plate, a partition, a supporting foot, a folding plate, a ball receiving box, a ball receiving groove, a cover shell, a baffle plate, and a cover plate. A ball throwing gap is arranged between the cover plate and the cover shell, a fixing seat is arranged on the cover plate and the cover shell, a screw rod is arranged between the two fixing seats, a ball pushing plate is arranged inside the cover shell, a connecting block is arranged on the upper end of the ball pushing plate, the connecting block is threadedly connected with the screw rod, and a through groove for moving the connecting block is opened on the cover shell. The device can simultaneously push a plurality of balls into the shell through the ball pushing plate, the demonstration efficiency is high, and each ball will not interfere with each other, so as to improve the accuracy of the probability demonstration. Through the arranged indicating rod and prompting plate, a single ball in each placement groove can be accurately and quickly pushed into the shell, and it is convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of teaching tools, in particular to a mathematical probability demonstration device. Background Art

[0002] Probability is a common concept in mathematics. In the teaching process, in order to enhance students' understanding of probability knowledge, specific probability teaching props are often used to demonstrate to students. A common example is Galton's nail board experiment. When the ball falls, after it contacts the nails on the board, it will have two directions of movement, left or right, so as to realize the deduction of the probability process. This teaching prop can stimulate students' interest in learning. However, in the process of using the teaching prop, the balls can only be put into the prop one by one. Putting a large number of balls in at one time will cause serious collisions between the balls, and there will be large errors in the probability deduction results. However, only putting one ball into the prop each time takes a lot of time, which is difficult to meet the usage needs. Utility Model Content

[0003] The purpose of the utility model is to provide a mathematical probability demonstration device, aiming to solve the problems mentioned in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: the mathematical probability demonstration device comprises a shell, the upper end and the lower end of the shell are open, a collision part in contact with the sphere is arranged above the interior of the shell, the collision part comprises fixed rods evenly arranged above the interior of the shell, wherein a vertical plate is arranged on the lower surface of the lowest fixed rod, at least one partition for evenly dividing the internal space of the shell is arranged inside the shell, supporting feet are arranged at both ends of the shell, a folding plate is arranged at the lower end of the supporting feet, and a sliding plate is arranged between the lower end of the shell and the folding plate. A ball receiving box is connected, and ball receiving grooves are evenly arranged inside the ball receiving box. A cover shell is arranged on the upper surface of the shell, and baffles are arranged at intervals inside the cover shell, and the number of the baffles is the same as the number of the partitions. A cover plate is arranged at the upper end opening of the shell, and a ball throwing gap is arranged between the cover plate and the cover shell. Fixed seats are arranged on the cover plate and the cover shell, and a screw rod is arranged between the two fixed seats. A ball pushing plate is arranged inside the cover shell, and a connecting block is arranged on the upper end of the ball pushing plate, and the connecting block is threadedly connected to the screw rod. A through groove for moving the connecting block is opened on the cover shell.

[0005] Preferably, a rotating disk is provided at the end of the screw rod.

[0006] Preferably, an indicator rod is provided on the rotating disk, and a prompt plate matching the indicator rod is provided on the cover shell. The indicator rod rotates N times, and when N is a positive integer, the sphere at the top enters the interior of the shell through the upper end of the shell.

[0007] Preferably, a vibration-damping sleeve is provided on the outer surface of the fixing rod.

[0008] Preferably, a through groove for moving the ball-pushing plate is provided inside the baffle, and the width of the through groove is smaller than the diameter of the ball.

[0009] The beneficial effects of the utility model are:

[0010] The device can simultaneously push multiple balls into the shell through the ball pushing plate, with high demonstration efficiency, and each ball will not interfere with each other, so as to improve the accuracy of probability demonstration. Through the set indicator rod and prompt board, a single ball in each placement slot can be accurately and quickly pushed into the shell, which is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a specific embodiment of the utility model.

[0012] Figure 2 It is a schematic diagram of the structure inside the shell of a specific embodiment of the utility model.

[0013] Figure 3 It is a schematic diagram of a partition according to a specific embodiment of the utility model.

[0014] Figure 4 It is a schematic diagram of the structure inside the cover shell of a specific embodiment of the utility model.

[0015] Figure 5 It is a structural schematic diagram of a ball pushing plate according to a specific embodiment of the utility model.

[0016] In the figure: 1. shell; 2. ball; 3. fixing rod; 4. vertical plate; 5. partition; 6. supporting foot; 7. folding plate; 8. ball receiving box; 9. ball receiving groove; 10. cover shell; 11. baffle; 12. cover plate; 13. fixing seat; 14. screw rod; 15. ball pushing plate; 16. connecting block; 17. through groove; 18. rotating disk; 19. indicator rod; 20. prompt plate; 21. shock-absorbing sleeve; 22. through groove. DETAILED DESCRIPTION

[0017] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings.

[0018] like Figure 1-5As shown, a mathematical probability demonstration device comprises a shell 1, the upper end and the lower end of the shell 1 are open, a collision part in contact with a ball 2 is arranged on the upper part of the shell 1, the collision part comprises a fixing rod 3 evenly arranged on the upper part of the shell 1, wherein a vertical plate 4 is arranged on the lower surface of the fixing rod 3 located at the bottom, at least one partition 5 for evenly dividing the internal space of the shell 1 is arranged inside the shell 1, supporting feet 6 are arranged at both ends of the shell 1, a folding plate 7 is arranged at the lower end of the supporting feet 6, a ball receiving box 8 is slidably connected between the lower end of the shell 1 and the folding plate 7, and the inside of the ball receiving box 8 is evenly provided with receiving A ball groove 9, a cover shell 10 is provided on the upper surface of the shell 1, and baffles 11 are provided at the internal intervals of the cover shell 10. The number of baffles 11 is the same as the number of partitions 5. A cover plate 12 is provided at the upper end opening of the shell 1, and a ball throwing gap is provided between the cover plate 12 and the cover shell 10. Fixed seats 13 are provided on the cover plate 12 and the cover shell 10, and a screw rod 14 is provided between the two fixed seats 13. A ball pushing plate 15 is provided inside the cover shell 10, and a connecting block 16 is provided on the upper end of the ball pushing plate 15. The connecting block 16 is threadedly connected to the screw rod 14, and a through groove 17 for moving the connecting block 16 is provided on the cover shell 10.

[0019] The shell 1 is made of colorless and transparent plastic material, which is convenient for observing the falling condition of the ball 2 in the shell 1 from the outside; falling channels for the ball 2 can be formed between the vertical plates 4 and the side walls of the shell 1 and between the vertical plates 4 and the vertical plates 4. The number of vertical plates 4 is M, so the number of falling channels for the ball 2 is M+1, and the number of ball receiving grooves 9 is equal to the number of falling channels for the ball 2, both of which are M+1; the partitions 5 are used to evenly divide the internal space of the shell 1, and the number of partitions 5 has a corresponding relationship with the maximum number of balls 2 that can be pushed into the shell 1 at the same time. The number of partitions 5 is Y, so the maximum number of balls 2 that can be pushed into the shell 1 at the same time is Y+1. By setting multiple groups of partitions 5, the efficiency of the balls 2 entering the shell 1 can be improved, and the balls 2 in the same batch entering the shell 1 will not collide with each other to ensure the randomness of the movement of the balls 2.

[0020] A placement groove can be formed between the baffle 11 and the side wall of the cover shell 10, as well as between the baffle 11 and the adjacent baffle 11, and the sphere 2 can be placed in the placement groove. The height of the placement groove is slightly larger than the diameter of the sphere 2, which improves the smoothness of the sphere 2 entering the placement groove and prevents obvious misalignment between the placed spheres 2. A ball throwing gap is provided between the cover plate 12 and the cover shell 10, through which the sphere 2 can be placed in the placement groove.

[0021] When the screw rod 14 rotates, the threaded connection between the screw rod 14 and the connecting block 16 can drive the ball pushing plate 15 to perform linear motion in the cover shell 10, and the ball 2 in the placement groove is pushed into the housing 1 synchronously.

[0022] The cover plate 12 is used to cover the upper opening of the shell 1 to prevent the ball 2 from popping out from the upper opening of the shell 1 .

[0023] Working principle: When in use, first divide the balls 2 evenly according to the number of placement slots, and then put them into the placement slots respectively. If the total number of balls 2 cannot be evenly divided, the parts that cannot be evenly divided can be put into different placement slots in turn. For example, there are 9 placement slots and a total of 50 balls 2, then 5 balls need to be put into each placement slot first, and then any 5 placement slots are selected and the remaining 5 balls 2 are put into the placement slots respectively, thereby completing the placement operation of the balls 2, and then the screw rod 14 is rotated, and the screw rod 14 drives the ball pushing plate 15 to move in the cover 10 through the connecting block 16. When the ball pushing plate 1 In the process of moving upward in an inclined manner, the balls 2 at the top of the placement slots and at the same level simultaneously enter the interior of the housing 1 through the upper opening of the housing 1. After each ball 2 collides with the fixing rod 3 in the housing 1, it falls into each ball receiving slot 9 in the ball receiving box 8. When the previous group of balls 2 enters the housing 1, wait for a few seconds and then the next group of balls 2 can be pushed into the interior of the housing 1 from the upper opening of the housing 1 until all the balls 2 in the cover 10 are pushed into the housing 1. Finally, the probability is calculated according to the number of balls 2 in each ball receiving slot 9.

[0024] Furthermore, a rotating disk 18 is disposed at the end of the screw rod 14 , and the rotation of the screw rod 14 can be easily controlled by the rotating disk 18 .

[0025] Furthermore, an indicator rod 19 is provided on the rotating disk 18, and a prompt plate 20 matched with the indicator rod 19 is provided on the cover 10. The number of rotations of the indicator rod 19 is N, and when N is a positive integer, the sphere 2 located at the top enters the interior of the shell 1 through the upper end of the shell 1. When the ball pushing plate 15 is located at the bottom of the cover 10, the indicator rod 19 on the rotating disk 18 coincides with the prompt plate 20. When N is equal to 1, it means that the rotating disk 18 rotates one circle, and the distance moved by the ball pushing plate 15 is equal to the diameter of the sphere 2. When the ball pushing plate 15 is located at the highest point of the cover 10, the sphere 2 cannot be placed in the placement slot, and when the control screw rod 14 rotates one circle counterclockwise, a sphere 2 can be placed in the placement slot. The number of rotations of the screw rod 14 can be controlled according to the number of spheres 2 that need to be placed in each placement slot, so as to accurately control the sphere 2 to enter the shell 1.

[0026] Furthermore, a shock-absorbing sleeve is provided on the outer surface of the fixing rod 3. The shock-absorbing sleeve 21 is made of rubber or silicone material, which can reduce the bounce height of the ball 2 after collision, thereby shortening the time for the ball 2 to fall from the upper end opening of the shell 1 to the ball receiving groove 9.

[0027] Furthermore, a through groove 22 for moving the ball pushing plate 15 is opened inside the baffle 11, and the width of the through groove 22 is smaller than the diameter of the ball 2. The through groove 22 facilitates the movement of the ball pushing plate 15 in the cover 10, while preventing the balls 2 in different placement slots from mixing with each other through the through groove 17.

[0028] The device can simultaneously push multiple balls 2 into the shell 1 through the ball pushing plate 15, with high demonstration efficiency, and each ball 2 will not interfere with each other, so as to improve the accuracy of probability demonstration. Through the provided indicator rod 19 and prompt plate 20, a single ball 2 in each placement slot can be accurately and quickly pushed into the shell 1, which is easy to use.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A mathematical probability demonstration device, characterized in that: The invention comprises a shell (1), wherein the upper and lower ends of the shell (1) are open, a collision portion contacting a ball (2) is arranged on the upper part of the interior of the shell (1), the collision portion comprises a fixing rod (3) evenly arranged on the upper part of the interior of the shell (1), wherein a vertical plate (4) is arranged on the lower surface of the fixing rod (3) located at the bottom, at least one partition (5) for evenly dividing the internal space of the shell (1) is arranged on the inside of the shell (1), supporting feet (6) are arranged at both ends of the shell (1), a folding plate (7) is arranged at the lower end of the supporting foot (6), a ball receiving box (8) is slidably connected between the lower end of the shell (1) and the folding plate (7), the inside of the ball receiving box (8) is evenly provided with ball receiving grooves (9), and the upper surface of the shell (1) is provided with a plurality of ball receiving grooves (9). A cover shell (10) is provided on the surface, and baffles (11) are provided at intervals inside the cover shell (10), and the number of the baffles (11) is the same as the number of the partitions (5). A cover plate (12) is provided at the upper opening of the shell (1), and a ball throwing gap is provided between the cover plate (12) and the cover shell (10). A fixing seat (13) is provided on the cover plate (12) and the cover shell (10), and a screw rod (14) is provided between the two fixing seats (13). A ball pushing plate (15) is provided inside the cover shell (10), and a connecting block (16) is provided at the upper end of the ball pushing plate (15), and the connecting block (16) is threadedly connected to the screw rod (14), and a through groove (17) for moving the connecting block (16) is provided on the cover shell (10).

2. The mathematical probability demonstration device according to claim 1, characterized in that: A rotating disk (18) is provided at the end of the screw rod (14).

3. The mathematical probability demonstration device according to claim 2, characterized in that: The rotating disk (18) is provided with an indicating rod (19), and the cover shell (10) is provided with a prompting plate (20) matched with the indicating rod (19). When the number of rotations of the indicating rod (19) is N and N is a positive integer, the sphere (2) located at the top enters the interior of the shell (1) through the upper end of the shell (1).

4. The mathematical probability demonstration device according to claim 1, characterized in that: The outer surface of the fixing rod (3) is provided with a vibration-damping sleeve.

5. The mathematical probability demonstration device according to any one of claims 1 to 4, characterized in that: A through groove (22) for moving the ball pushing plate (15) is provided inside the baffle (11), and the width of the through groove (22) is smaller than the diameter of the ball (2).

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